| Flutter Impeller |

canvas.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "impeller/display_list/canvas.h"
6
7 #include <memory>
8 #include <optional>
9 #include <unordered_map>
10 #include <utility>
11
12 #include "display_list/effects/color_filters/dl_blend_color_filter.h"
13 #include "display_list/effects/color_filters/dl_matrix_color_filter.h"
14 #include "display_list/effects/dl_color_filter.h"
15 #include "display_list/effects/dl_color_source.h"
16 #include "display_list/effects/dl_image_filter.h"
17 #include "display_list/image/dl_image.h"
18 #include "flutter/fml/logging.h"
19 #include "flutter/fml/trace_event.h"
20 #include "impeller/base/validation.h"
21 #include "impeller/core/formats.h"
22 #include "impeller/display_list/color_filter.h"
23 #include "impeller/display_list/image_filter.h"
24 #include "impeller/display_list/skia_conversions.h"
25 #include "impeller/entity/contents/atlas_contents.h"
26 #include "impeller/entity/contents/clip_contents.h"
27 #include "impeller/entity/contents/color_source_contents.h"
28 #include "impeller/entity/contents/content_context.h"
29 #include "impeller/entity/contents/filters/filter_contents.h"
30 #include "impeller/entity/contents/framebuffer_blend_contents.h"
31 #include "impeller/entity/contents/line_contents.h"
32 #include "impeller/entity/contents/solid_rrect_blur_contents.h"
33 #include "impeller/entity/contents/solid_rsuperellipse_blur_contents.h"
34 #include "impeller/entity/contents/text_contents.h"
35 #include "impeller/entity/contents/text_shadow_cache.h"
36 #include "impeller/entity/contents/texture_contents.h"
37 #include "impeller/entity/contents/vertices_contents.h"
38 #include "impeller/entity/geometry/arc_geometry.h"
39 #include "impeller/entity/geometry/circle_geometry.h"
40 #include "impeller/entity/geometry/cover_geometry.h"
41 #include "impeller/entity/geometry/ellipse_geometry.h"
42 #include "impeller/entity/geometry/fill_path_geometry.h"
43 #include "impeller/entity/geometry/geometry.h"
44 #include "impeller/entity/geometry/line_geometry.h"
45 #include "impeller/entity/geometry/point_field_geometry.h"
46 #include "impeller/entity/geometry/rect_geometry.h"
47 #include "impeller/entity/geometry/stroke_path_geometry.h"
48 #include "impeller/entity/save_layer_utils.h"
49 #include "impeller/geometry/color.h"
50 #include "impeller/geometry/constants.h"
51 #include "impeller/geometry/rstransform.h"
52 #include "impeller/renderer/command_buffer.h"
53
54 namespace impeller {
55
56 namespace {
57
58 bool IsPipelineBlendOrMatrixFilter(const flutter::DlColorFilter* filter) {
59 return filter->type() == flutter::DlColorFilterType::kMatrix ||
60 (filter->type() == flutter::DlColorFilterType::kBlend &&
61 filter->asBlend()->mode() <= Entity::kLastPipelineBlendMode);
62 }
63
64 static bool UseColorSourceContents(
65 const std::shared_ptr<VerticesGeometry>& vertices,
66 const Paint& paint) {
67 // If there are no vertex color or texture coordinates. Or if there
68 // are vertex coordinates but its just a color.
69 if (vertices->HasVertexColors()) {
70 return false;
71 }
72 if (vertices->HasTextureCoordinates() && !paint.color_source) {
73 return true;
74 }
75 return !vertices->HasTextureCoordinates();
76 }
77
78 static void SetClipScissor(std::optional<Rect> clip_coverage,
79 RenderPass& pass,
80 Point global_pass_position) {
81 // Set the scissor to the clip coverage area. We do this prior to rendering
82 // the clip itself and all its contents.
83 IRect32 scissor;
84 if (clip_coverage.has_value()) {
85 clip_coverage = clip_coverage->Shift(-global_pass_position);
86 scissor = IRect32::RoundOut(clip_coverage.value());
87 // The scissor rect must not exceed the size of the render target.
88 scissor =
89 scissor.Intersection(IRect32::MakeSize(pass.GetRenderTargetSize()))
90 .value_or(IRect32());
91 }
92 pass.SetScissor(scissor);
93 }
94
95 static void ApplyFramebufferBlend(Entity& entity) {
96 auto src_contents = entity.GetContents();
97 auto contents = std::make_shared<FramebufferBlendContents>();
98 contents->SetChildContents(src_contents);
99 contents->SetBlendMode(entity.GetBlendMode());
100 entity.SetContents(std::move(contents));
101 entity.SetBlendMode(BlendMode::kSrc);
102 }
103
104 /// @brief Create the subpass restore contents, appling any filters or opacity
105 /// from the provided paint object.
106 static std::shared_ptr<Contents> CreateContentsForSubpassTarget(
107 const Paint& paint,
108 const std::shared_ptr<Texture>& target,
109 const Matrix& effect_transform) {
110 auto contents = TextureContents::MakeRect(Rect::MakeSize(target->GetSize()));
111 contents->SetTexture(target);
112 contents->SetLabel("Subpass");
113 contents->SetSourceRect(Rect::MakeSize(target->GetSize()));
114 contents->SetOpacity(paint.color.alpha);
115 contents->SetDeferApplyingOpacity(true);
116
117 return paint.WithFiltersForSubpassTarget(std::move(contents),
118 effect_transform);
119 }
120
121 static const constexpr RenderTarget::AttachmentConfig kDefaultStencilConfig =
122 RenderTarget::AttachmentConfig{
123 .storage_mode = StorageMode::kDeviceTransient,
124 .load_action = LoadAction::kDontCare,
125 .store_action = StoreAction::kDontCare,
126 };
127
128 static std::unique_ptr<EntityPassTarget> CreateRenderTarget(
129 ContentContext& renderer,
130 ISize size,
131 const Color& clear_color) {
132 const std::shared_ptr<Context>& context = renderer.GetContext();
133
134 /// All of the load/store actions are managed by `InlinePassContext` when
135 /// `RenderPasses` are created, so we just set them to `kDontCare` here.
136 /// What's important is the `StorageMode` of the textures, which cannot be
137 /// changed for the lifetime of the textures.
138
139 RenderTarget target;
140 if (context->GetCapabilities()->SupportsOffscreenMSAA()) {
141 target = renderer.GetRenderTargetCache()->CreateOffscreenMSAA(
142 /*context=*/*context,
143 /*size=*/size,
144 /*mip_count=*/1,
145 /*label=*/"EntityPass",
146 /*color_attachment_config=*/
147 RenderTarget::AttachmentConfigMSAA{
148 .storage_mode = StorageMode::kDeviceTransient,
149 .resolve_storage_mode = StorageMode::kDevicePrivate,
150 .load_action = LoadAction::kDontCare,
151 .store_action = StoreAction::kMultisampleResolve,
152 .clear_color = clear_color},
153 /*stencil_attachment_config=*/kDefaultStencilConfig);
154 } else {
155 target = renderer.GetRenderTargetCache()->CreateOffscreen(
156 *context, // context
157 size, // size
158 /*mip_count=*/1,
159 "EntityPass", // label
160 RenderTarget::AttachmentConfig{
161 .storage_mode = StorageMode::kDevicePrivate,
162 .load_action = LoadAction::kDontCare,
163 .store_action = StoreAction::kDontCare,
164 .clear_color = clear_color,
165 }, // color_attachment_config
166 kDefaultStencilConfig //
167 );
168 }
169
170 return std::make_unique<EntityPassTarget>(
171 target, //
172 renderer.GetDeviceCapabilities().SupportsReadFromResolve(), //
173 renderer.GetDeviceCapabilities().SupportsImplicitResolvingMSAA() //
174 );
175 }
176
177 } // namespace
178
179 std::shared_ptr<SolidRRectLikeBlurContents>
180 Canvas::RRectBlurShape::BuildBlurContent() {
181 return std::make_shared<SolidRRectBlurContents>();
182 }
183
184 Geometry& Canvas::RRectBlurShape::BuildGeometry(Rect rect, Scalar radius) {
185 return geom_.emplace(rect, Size{radius, radius});
186 }
187
188 std::shared_ptr<SolidRRectLikeBlurContents>
189 Canvas::RSuperellipseBlurShape::BuildBlurContent() {
190 return std::make_shared<SolidRSuperellipseBlurContents>();
191 }
192
193 Geometry& Canvas::RSuperellipseBlurShape::BuildGeometry(Rect rect,
194 Scalar radius) {
195 return geom_.emplace(rect, radius);
196 }
197
198 Canvas::Canvas(ContentContext& renderer,
199 const RenderTarget& render_target,
200 bool is_onscreen,
201 bool requires_readback)
202 : renderer_(renderer),
203 render_target_(render_target),
204 is_onscreen_(is_onscreen),
205 requires_readback_(requires_readback),
206 clip_coverage_stack_(EntityPassClipStack(
207 Rect::MakeSize(render_target.GetRenderTargetSize()))) {
208 Initialize(std::nullopt);
209 SetupRenderPass();
210 }
211
212 Canvas::Canvas(ContentContext& renderer,
213 const RenderTarget& render_target,
214 bool is_onscreen,
215 bool requires_readback,
216 Rect cull_rect)
217 : renderer_(renderer),
218 render_target_(render_target),
219 is_onscreen_(is_onscreen),
220 requires_readback_(requires_readback),
221 clip_coverage_stack_(EntityPassClipStack(
222 Rect::MakeSize(render_target.GetRenderTargetSize()))) {
223 Initialize(cull_rect);
224 SetupRenderPass();
225 }
226
227 Canvas::Canvas(ContentContext& renderer,
228 const RenderTarget& render_target,
229 bool is_onscreen,
230 bool requires_readback,
231 IRect32 cull_rect)
232 : renderer_(renderer),
233 render_target_(render_target),
234 is_onscreen_(is_onscreen),
235 requires_readback_(requires_readback),
236 clip_coverage_stack_(EntityPassClipStack(
237 Rect::MakeSize(render_target.GetRenderTargetSize()))) {
238 Initialize(Rect::MakeLTRB(cull_rect.GetLeft(), cull_rect.GetTop(),
239 cull_rect.GetRight(), cull_rect.GetBottom()));
240 SetupRenderPass();
241 }
242
243 void Canvas::Initialize(std::optional<Rect> cull_rect) {
244 initial_cull_rect_ = cull_rect;
245 transform_stack_.emplace_back(CanvasStackEntry{
246 .clip_depth = kMaxDepth,
247 });
248 FML_DCHECK(GetSaveCount() == 1u);
249 }
250
251 void Canvas::Reset() {
252 current_depth_ = 0u;
253 transform_stack_ = {};
254 }
255
256 void Canvas::Concat(const Matrix& transform) {
257 transform_stack_.back().transform = GetCurrentTransform() * transform;
258 }
259
260 void Canvas::PreConcat(const Matrix& transform) {
261 transform_stack_.back().transform = transform * GetCurrentTransform();
262 }
263
264 void Canvas::ResetTransform() {
265 transform_stack_.back().transform = {};
266 }
267
268 void Canvas::Transform(const Matrix& transform) {
269 Concat(transform);
270 }
271
272 const Matrix& Canvas::GetCurrentTransform() const {
273 return transform_stack_.back().transform;
274 }
275
276 void Canvas::Translate(const Vector3& offset) {
277 Concat(Matrix::MakeTranslation(offset));
278 }
279
280 void Canvas::Scale(const Vector2& scale) {
281 Concat(Matrix::MakeScale(scale));
282 }
283
284 void Canvas::Scale(const Vector3& scale) {
285 Concat(Matrix::MakeScale(scale));
286 }
287
288 void Canvas::Skew(Scalar sx, Scalar sy) {
289 Concat(Matrix::MakeSkew(sx, sy));
290 }
291
292 void Canvas::Rotate(Radians radians) {
293 Concat(Matrix::MakeRotationZ(radians));
294 }
295
296 Point Canvas::GetGlobalPassPosition() const {
297 if (save_layer_state_.empty()) {
298 return Point(0, 0);
299 }
300 return save_layer_state_.back().coverage.GetOrigin();
301 }
302
303 // clip depth of the previous save or 0.
304 size_t Canvas::GetClipHeightFloor() const {
305 if (transform_stack_.size() > 1) {
306 return transform_stack_[transform_stack_.size() - 2].clip_height;
307 }
308 return 0;
309 }
310
311 size_t Canvas::GetSaveCount() const {
312 return transform_stack_.size();
313 }
314
315 bool Canvas::IsSkipping() const {
316 return transform_stack_.back().skipping;
317 }
318
319 void Canvas::RestoreToCount(size_t count) {
320 while (GetSaveCount() > count) {
321 if (!Restore()) {
322 return;
323 }
324 }
325 }
326
327 void Canvas::DrawPath(const flutter::DlPath& path, const Paint& paint) {
328 Entity entity;
329 entity.SetTransform(GetCurrentTransform());
330 entity.SetBlendMode(paint.blend_mode);
331
332 if (paint.style == Paint::Style::kFill) {
333 FillPathGeometry geom(path);
334 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
335 } else {
336 StrokePathGeometry geom(path, paint.stroke);
337 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
338 }
339 }
340
341 void Canvas::DrawPaint(const Paint& paint) {
342 Entity entity;
343 entity.SetTransform(GetCurrentTransform());
344 entity.SetBlendMode(paint.blend_mode);
345
346 CoverGeometry geom;
347 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
348 }
349
350 // Optimization: if the texture has a color filter that is a simple
351 // porter-duff blend or matrix filter, then instead of performing a save layer
352 // we should swap out the shader for the porter duff blend shader and avoid a
353 // saveLayer. This optimization is important for Flame.
354 bool Canvas::AttemptColorFilterOptimization(
355 const std::shared_ptr<Texture>& image,
356 Rect source,
357 Rect dest,
358 const Paint& paint,
359 const SamplerDescriptor& sampler,
360 SourceRectConstraint src_rect_constraint) {
361 if (!paint.color_filter || //
362 paint.image_filter != nullptr || //
363 paint.invert_colors || //
364 paint.mask_blur_descriptor.has_value() || //
365 !IsPipelineBlendOrMatrixFilter(paint.color_filter)) {
366 return false;
367 }
368
369 if (paint.color_filter->type() == flutter::DlColorFilterType::kBlend) {
370 const flutter::DlBlendColorFilter* blend_filter =
371 paint.color_filter->asBlend();
372 DrawImageRectAtlasGeometry geometry = DrawImageRectAtlasGeometry(
373 /*texture=*/image,
374 /*source=*/source,
375 /*destination=*/dest,
376 /*color=*/skia_conversions::ToColor(blend_filter->color()),
377 /*blend_mode=*/blend_filter->mode(),
378 /*desc=*/sampler,
379 /*use_strict_src_rect=*/src_rect_constraint ==
380 SourceRectConstraint::kStrict);
381
382 auto atlas_contents = std::make_shared<AtlasContents>();
383 atlas_contents->SetGeometry(&geometry);
384 atlas_contents->SetAlpha(paint.color.alpha);
385
386 Entity entity;
387 entity.SetTransform(GetCurrentTransform());
388 entity.SetBlendMode(paint.blend_mode);
389 entity.SetContents(atlas_contents);
390
391 AddRenderEntityToCurrentPass(entity);
392 } else {
393 // src_rect_constraint is only supported in the porter-duff mode
394 // for now.
395 if (src_rect_constraint == SourceRectConstraint::kStrict) {
396 return false;
397 }
398
399 const flutter::DlMatrixColorFilter* matrix_filter =
400 paint.color_filter->asMatrix();
401
402 DrawImageRectAtlasGeometry geometry = DrawImageRectAtlasGeometry(
403 /*texture=*/image,
404 /*source=*/source,
405 /*destination=*/dest,
406 /*color=*/Color::Khaki(), // ignored
407 /*blend_mode=*/BlendMode::kSrcOver, // ignored
408 /*desc=*/sampler,
409 /*use_strict_src_rect=*/src_rect_constraint ==
410 SourceRectConstraint::kStrict);
411
412 auto atlas_contents = std::make_shared<ColorFilterAtlasContents>();
413 atlas_contents->SetGeometry(&geometry);
414 atlas_contents->SetAlpha(paint.color.alpha);
415 impeller::ColorMatrix color_matrix;
416 matrix_filter->get_matrix(color_matrix.array);
417 atlas_contents->SetMatrix(color_matrix);
418
419 Entity entity;
420 entity.SetTransform(GetCurrentTransform());
421 entity.SetBlendMode(paint.blend_mode);
422 entity.SetContents(atlas_contents);
423
424 AddRenderEntityToCurrentPass(entity);
425 }
426 return true;
427 }
428
429 bool Canvas::AttemptDrawBlurredRRect(const Rect& rect,
430 Size corner_radii,
431 const Paint& paint) {
432 RRectBlurShape rrect_shape;
433 return AttemptDrawBlurredRRectLike(rect, corner_radii, paint, rrect_shape);
434 }
435
436 bool Canvas::AttemptDrawBlurredRSuperellipse(const Rect& rect,
437 Size corner_radii,
438 const Paint& paint) {
439 RSuperellipseBlurShape rsuperellipse_shape;
440 return AttemptDrawBlurredRRectLike(rect, corner_radii, paint,
441 rsuperellipse_shape);
442 }
443
444 bool Canvas::AttemptDrawBlurredRRectLike(const Rect& rect,
445 Size corner_radii,
446 const Paint& paint,
447 RRectLikeBlurShape& shape) {
448 if (paint.style != Paint::Style::kFill) {
449 return false;
450 }
451
452 if (paint.color_source) {
453 return false;
454 }
455
456 if (!paint.mask_blur_descriptor.has_value()) {
457 return false;
458 }
459
460 // A blur sigma that is not positive enough should not result in a blur.
461 if (paint.mask_blur_descriptor->sigma.sigma <= kEhCloseEnough) {
462 return false;
463 }
464
465 // The current rrect blur math doesn't work on ovals.
466 if (fabsf(corner_radii.width - corner_radii.height) > kEhCloseEnough) {
467 return false;
468 }
469 Scalar corner_radius = corner_radii.width;
470
471 // For symmetrically mask blurred solid RRects, absorb the mask blur and use
472 // a faster SDF approximation.
473 Color rrect_color = paint.color;
474 if (paint.invert_colors) {
475 rrect_color = rrect_color.ApplyColorMatrix(kColorInversion);
476 }
477 if (paint.color_filter) {
478 rrect_color = GetCPUColorFilterProc(paint.color_filter)(rrect_color);
479 }
480
481 Paint rrect_paint = {.mask_blur_descriptor = paint.mask_blur_descriptor};
482
483 // In some cases, we need to render the mask blur to a separate layer.
484 //
485 // 1. If the blur style is normal, we'll be drawing using one draw call and
486 // no clips. And so we can just wrap the RRect contents with the
487 // ImageFilter, which will get applied to the result as per usual.
488 //
489 // 2. If the blur style is solid, we combine the non-blurred RRect with the
490 // blurred RRect via two separate draw calls, and so we need to defer any
491 // fancy blending, translucency, or image filtering until after these two
492 // draws have been combined in a separate layer.
493 //
494 // 3. If the blur style is outer or inner, we apply the blur style via a
495 // clip. The ImageFilter needs to be applied to the mask blurred result.
496 // And so if there's an ImageFilter, we need to defer applying it until
497 // after the clipped RRect blur has been drawn to a separate texture.
498 // However, since there's only one draw call that produces color, we
499 // don't need to worry about the blend mode or translucency (unlike with
500 // BlurStyle::kSolid).
501 //
502 if ((paint.mask_blur_descriptor->style !=
503 FilterContents::BlurStyle::kNormal &&
504 paint.image_filter) ||
505 (paint.mask_blur_descriptor->style == FilterContents::BlurStyle::kSolid &&
506 (!rrect_color.IsOpaque() || paint.blend_mode != BlendMode::kSrcOver))) {
507 Rect render_bounds = rect;
508 if (paint.mask_blur_descriptor->style !=
509 FilterContents::BlurStyle::kInner) {
510 render_bounds =
511 render_bounds.Expand(paint.mask_blur_descriptor->sigma.sigma * 4.0);
512 }
513 // Defer the alpha, blend mode, and image filter to a separate layer.
514 SaveLayer(
515 Paint{
516 .color = Color::White().WithAlpha(rrect_color.alpha),
517 .image_filter = paint.image_filter,
518 .blend_mode = paint.blend_mode,
519 },
520 render_bounds, nullptr, ContentBoundsPromise::kContainsContents, 1u);
521 rrect_paint.color = rrect_color.WithAlpha(1);
522 } else {
523 rrect_paint.color = rrect_color;
524 rrect_paint.blend_mode = paint.blend_mode;
525 rrect_paint.image_filter = paint.image_filter;
526 Save(1u);
527 }
528
529 auto draw_blurred_rrect = [this, &rect, corner_radius, &rrect_paint,
530 &shape]() {
531 auto contents = shape.BuildBlurContent();
532
533 contents->SetColor(rrect_paint.color);
534 contents->SetSigma(rrect_paint.mask_blur_descriptor->sigma);
535 contents->SetShape(rect, corner_radius);
536
537 Entity blurred_rrect_entity;
538 blurred_rrect_entity.SetTransform(GetCurrentTransform());
539 blurred_rrect_entity.SetBlendMode(rrect_paint.blend_mode);
540
541 rrect_paint.mask_blur_descriptor = std::nullopt;
542 blurred_rrect_entity.SetContents(
543 rrect_paint.WithFilters(std::move(contents)));
544 AddRenderEntityToCurrentPass(blurred_rrect_entity);
545 };
546
547 switch (rrect_paint.mask_blur_descriptor->style) {
548 case FilterContents::BlurStyle::kNormal: {
549 draw_blurred_rrect();
550 break;
551 }
552 case FilterContents::BlurStyle::kSolid: {
553 // First, draw the blurred RRect.
554 draw_blurred_rrect();
555 // Then, draw the non-blurred RRect on top.
556 Entity entity;
557 entity.SetTransform(GetCurrentTransform());
558 entity.SetBlendMode(rrect_paint.blend_mode);
559
560 Geometry& geom = shape.BuildGeometry(rect, corner_radius);
561 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, rrect_paint,
562 /*reuse_depth=*/true);
563 break;
564 }
565 case FilterContents::BlurStyle::kOuter: {
566 Geometry& geom = shape.BuildGeometry(rect, corner_radius);
567 ClipGeometry(geom, Entity::ClipOperation::kDifference);
568 draw_blurred_rrect();
569 break;
570 }
571 case FilterContents::BlurStyle::kInner: {
572 Geometry& geom = shape.BuildGeometry(rect, corner_radius);
573 ClipGeometry(geom, Entity::ClipOperation::kIntersect);
574 draw_blurred_rrect();
575 break;
576 }
577 }
578
579 Restore();
580
581 return true;
582 }
583
584 void Canvas::DrawLine(const Point& p0,
585 const Point& p1,
586 const Paint& paint,
587 bool reuse_depth) {
588 Entity entity;
589 entity.SetTransform(GetCurrentTransform());
590 entity.SetBlendMode(paint.blend_mode);
591
592 auto geometry = std::make_unique<LineGeometry>(p0, p1, paint.stroke);
593
594 if (renderer_.GetContext()->GetFlags().antialiased_lines &&
595 !paint.color_filter && !paint.invert_colors && !paint.image_filter &&
596 !paint.mask_blur_descriptor.has_value() && !paint.color_source) {
597 auto contents = LineContents::Make(std::move(geometry), paint.color);
598 entity.SetContents(std::move(contents));
599 AddRenderEntityToCurrentPass(entity, reuse_depth);
600 } else {
601 AddRenderEntityWithFiltersToCurrentPass(entity, geometry.get(), paint,
602 /*reuse_depth=*/reuse_depth);
603 }
604 }
605
606 void Canvas::DrawDashedLine(const Point& p0,
607 const Point& p1,
608 Scalar on_length,
609 Scalar off_length,
610 const Paint& paint) {
611 // Reasons to defer to regular DrawLine:
612 // - performance for degenerate and "regular line" cases
613 // - length is non-positive - DrawLine will draw appropriate "dot"
614 // - off_length is non-positive - no gaps, DrawLine will draw it solid
615 // - on_length is negative - invalid dashing
616 //
617 // Note that a 0 length "on" dash will draw "dot"s every "off" distance
618 // apart so we proceed with the dashing process in that case.
619 Scalar length = p0.GetDistance(p1);
620 if (length > 0.0f && on_length >= 0.0f && off_length > 0.0f) {
621 Entity entity;
622 entity.SetTransform(GetCurrentTransform());
623 entity.SetBlendMode(paint.blend_mode);
624
625 StrokeDashedLineGeometry geom(p0, p1, on_length, off_length, paint.stroke);
626 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
627 } else {
628 DrawLine(p0, p1, paint);
629 }
630 }
631
632 void Canvas::DrawRect(const Rect& rect, const Paint& paint) {
633 if (AttemptDrawBlurredRRect(rect, {}, paint)) {
634 return;
635 }
636
637 Entity entity;
638 entity.SetTransform(GetCurrentTransform());
639 entity.SetBlendMode(paint.blend_mode);
640
641 if (paint.style == Paint::Style::kStroke) {
642 StrokeRectGeometry geom(rect, paint.stroke);
643 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
644 } else {
645 FillRectGeometry geom(rect);
646 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
647 }
648 }
649
650 void Canvas::DrawOval(const Rect& rect, const Paint& paint) {
651 // TODO(jonahwilliams): This additional condition avoids an assert in the
652 // stroke circle geometry generator. I need to verify the condition that this
653 // assert prevents.
654 if (rect.IsSquare() && (paint.style == Paint::Style::kFill ||
655 (paint.style == Paint::Style::kStroke &&
656 paint.stroke.width < rect.GetWidth()))) {
657 // Circles have slightly less overhead and can do stroking
658 DrawCircle(rect.GetCenter(), rect.GetWidth() * 0.5f, paint);
659 return;
660 }
661
662 if (AttemptDrawBlurredRRect(rect, rect.GetSize() * 0.5f, paint)) {
663 return;
664 }
665
666 Entity entity;
667 entity.SetTransform(GetCurrentTransform());
668 entity.SetBlendMode(paint.blend_mode);
669
670 if (paint.style == Paint::Style::kStroke) {
671 StrokeEllipseGeometry geom(rect, paint.stroke);
672 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
673 } else {
674 EllipseGeometry geom(rect);
675 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
676 }
677 }
678
679 void Canvas::DrawArc(const Arc& arc, const Paint& paint) {
680 Entity entity;
681 entity.SetTransform(GetCurrentTransform());
682 entity.SetBlendMode(paint.blend_mode);
683
684 if (paint.style == Paint::Style::kFill) {
685 ArcGeometry geom(arc);
686 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
687 return;
688 }
689
690 const Rect& oval_bounds = arc.GetOvalBounds();
691 if (paint.stroke.width > oval_bounds.GetSize().MaxDimension()) {
692 // This is a special case for rendering arcs whose stroke width is so large
693 // you are effectively drawing a sector of a circle.
694 // https://github.com/flutter/flutter/issues/158567
695 Arc expanded_arc(oval_bounds.Expand(Size(paint.stroke.width * 0.5f)),
696 arc.GetStart(), arc.GetSweep(), true);
697
698 ArcGeometry geom(expanded_arc);
699 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
700 return;
701 }
702
703 // IncludeCenter incurs lots of extra work for stroking an arc, including:
704 // - It introduces segments to/from the center point (not too hard).
705 // - It introduces joins on those segments (a bit more complicated).
706 // - Even if the sweep is >=360 degrees, we still draw the segment to
707 // the center and it basically looks like a pie cut into the complete
708 // boundary circle, as if the slice were cut, but not extracted
709 // (hard to express as a continuous kTriangleStrip).
710 if (!arc.IncludeCenter()) {
711 if (arc.IsFullCircle()) {
712 return DrawOval(oval_bounds, paint);
713 }
714
715 // Our fast stroking code only works for circular bounds as it assumes
716 // that the inner and outer radii can be scaled along each angular step
717 // of the arc - which is not true for elliptical arcs where the inner
718 // and outer samples are perpendicular to the traveling direction of the
719 // elliptical curve which may not line up with the center of the bounds.
720 //
721 // TODO(flar): It also only supports Butt and Square caps for now.
722 // See https://github.com/flutter/flutter/issues/169400
723 if (oval_bounds.IsSquare() && paint.stroke.cap != Cap::kRound) {
724 ArcGeometry geom(arc, paint.stroke);
725 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
726 return;
727 }
728 }
729
730 ArcStrokeGeometry geom(arc, paint.stroke);
731 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
732 }
733
734 void Canvas::DrawRoundRect(const RoundRect& round_rect, const Paint& paint) {
735 auto& rect = round_rect.GetBounds();
736 auto& radii = round_rect.GetRadii();
737 if (radii.AreAllCornersSame()) {
738 if (AttemptDrawBlurredRRect(rect, radii.top_left, paint)) {
739 return;
740 }
741
742 if (paint.style == Paint::Style::kFill) {
743 Entity entity;
744 entity.SetTransform(GetCurrentTransform());
745 entity.SetBlendMode(paint.blend_mode);
746
747 RoundRectGeometry geom(rect, radii.top_left);
748 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
749 return;
750 }
751 }
752
753 Entity entity;
754 entity.SetTransform(GetCurrentTransform());
755 entity.SetBlendMode(paint.blend_mode);
756
757 if (paint.style == Paint::Style::kFill) {
758 FillRoundRectGeometry geom(round_rect);
759 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
760 } else {
761 StrokeRoundRectGeometry geom(round_rect, paint.stroke);
762 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
763 }
764 }
765
766 void Canvas::DrawDiffRoundRect(const RoundRect& outer,
767 const RoundRect& inner,
768 const Paint& paint) {
769 Entity entity;
770 entity.SetTransform(GetCurrentTransform());
771 entity.SetBlendMode(paint.blend_mode);
772
773 if (paint.style == Paint::Style::kFill) {
774 FillDiffRoundRectGeometry geom(outer, inner);
775 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
776 } else {
777 StrokeDiffRoundRectGeometry geom(outer, inner, paint.stroke);
778 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
779 }
780 }
781
782 void Canvas::DrawRoundSuperellipse(const RoundSuperellipse& round_superellipse,
783 const Paint& paint) {
784 auto& rect = round_superellipse.GetBounds();
785 auto& radii = round_superellipse.GetRadii();
786 if (radii.AreAllCornersSame() &&
787 AttemptDrawBlurredRSuperellipse(rect, radii.top_left, paint)) {
788 return;
789 }
790
791 Entity entity;
792 entity.SetTransform(GetCurrentTransform());
793 entity.SetBlendMode(paint.blend_mode);
794
795 if (paint.style == Paint::Style::kFill) {
796 RoundSuperellipseGeometry geom(rect, radii);
797 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
798 } else {
799 StrokeRoundSuperellipseGeometry geom(round_superellipse, paint.stroke);
800 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
801 }
802 }
803
804 void Canvas::DrawCircle(const Point& center,
805 Scalar radius,
806 const Paint& paint) {
807 Size half_size(radius, radius);
808 if (AttemptDrawBlurredRRect(
809 Rect::MakeOriginSize(center - half_size, half_size * 2),
810 {radius, radius}, paint)) {
811 return;
812 }
813
814 Entity entity;
815 entity.SetTransform(GetCurrentTransform());
816 entity.SetBlendMode(paint.blend_mode);
817
818 if (paint.style == Paint::Style::kStroke) {
819 CircleGeometry geom(center, radius, paint.stroke.width);
820 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
821 } else {
822 CircleGeometry geom(center, radius);
823 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
824 }
825 }
826
827 void Canvas::ClipGeometry(const Geometry& geometry,
828 Entity::ClipOperation clip_op,
829 bool is_aa) {
830 if (IsSkipping()) {
831 return;
832 }
833
834 // Ideally the clip depth would be greater than the current rendering
835 // depth because any rendering calls that follow this clip operation will
836 // pre-increment the depth and then be rendering above our clip depth,
837 // but that case will be caught by the CHECK in AddRenderEntity above.
838 // In practice we sometimes have a clip set with no rendering after it
839 // and in such cases the current depth will equal the clip depth.
840 // Eventually the DisplayList should optimize these out, but it is hard
841 // to know if a clip will actually be used in advance of storing it in
842 // the DisplayList buffer.
843 // See https://github.com/flutter/flutter/issues/147021
844 FML_DCHECK(current_depth_ <= transform_stack_.back().clip_depth)
845 << current_depth_ << " <=? " << transform_stack_.back().clip_depth;
846 uint32_t clip_depth = transform_stack_.back().clip_depth;
847
848 const Matrix clip_transform =
849 Matrix::MakeTranslation(Vector3(-GetGlobalPassPosition())) *
850 GetCurrentTransform();
851
852 std::optional<Rect> clip_coverage = geometry.GetCoverage(clip_transform);
853 if (!clip_coverage.has_value()) {
854 return;
855 }
856
857 ClipContents clip_contents(
858 clip_coverage.value(),
859 /*is_axis_aligned_rect=*/geometry.IsAxisAlignedRect() &&
860 GetCurrentTransform().IsTranslationScaleOnly());
861 clip_contents.SetClipOperation(clip_op);
862
863 EntityPassClipStack::ClipStateResult clip_state_result =
864 clip_coverage_stack_.RecordClip(
865 clip_contents, //
866 /*transform=*/clip_transform, //
867 /*global_pass_position=*/GetGlobalPassPosition(), //
868 /*clip_depth=*/clip_depth, //
869 /*clip_height_floor=*/GetClipHeightFloor(), //
870 /*is_aa=*/is_aa);
871
872 if (clip_state_result.clip_did_change) {
873 // We only need to update the pass scissor if the clip state has changed.
874 SetClipScissor(
875 clip_coverage_stack_.CurrentClipCoverage(),
876 *render_passes_.back().GetInlinePassContext()->GetRenderPass(),
877 GetGlobalPassPosition());
878 }
879
880 ++transform_stack_.back().clip_height;
881 ++transform_stack_.back().num_clips;
882
883 if (!clip_state_result.should_render) {
884 return;
885 }
886
887 // Note: this is a bit of a hack. Its not possible to construct a geometry
888 // result without begninning the render pass. We should refactor the geometry
889 // objects so that they only need a reference to the render pass size and/or
890 // orthographic transform.
891 Entity entity;
892 entity.SetTransform(clip_transform);
893 entity.SetClipDepth(clip_depth);
894
895 GeometryResult geometry_result = geometry.GetPositionBuffer(
896 renderer_, //
897 entity, //
898 *render_passes_.back().GetInlinePassContext()->GetRenderPass() //
899 );
900 clip_contents.SetGeometry(geometry_result);
901 clip_coverage_stack_.GetLastReplayResult().clip_contents.SetGeometry(
902 geometry_result);
903
904 clip_contents.Render(
905 renderer_, *render_passes_.back().GetInlinePassContext()->GetRenderPass(),
906 clip_depth);
907 }
908
909 void Canvas::DrawPoints(const Point points[],
910 uint32_t count,
911 Scalar radius,
912 const Paint& paint,
913 PointStyle point_style) {
914 if (radius <= 0) {
915 return;
916 }
917
918 Entity entity;
919 entity.SetTransform(GetCurrentTransform());
920 entity.SetBlendMode(paint.blend_mode);
921
922 PointFieldGeometry geom(points, count, radius,
923 /*round=*/point_style == PointStyle::kRound);
924 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
925 }
926
927 void Canvas::DrawImage(const std::shared_ptr<Texture>& image,
928 Point offset,
929 const Paint& paint,
930 const SamplerDescriptor& sampler) {
931 if (!image) {
932 return;
933 }
934
935 const Rect source = Rect::MakeSize(image->GetSize());
936 const Rect dest = source.Shift(offset);
937
938 DrawImageRect(image, source, dest, paint, sampler);
939 }
940
941 void Canvas::DrawImageRect(const std::shared_ptr<Texture>& image,
942 Rect source,
943 Rect dest,
944 const Paint& paint,
945 const SamplerDescriptor& sampler,
946 SourceRectConstraint src_rect_constraint) {
947 if (!image || source.IsEmpty() || dest.IsEmpty()) {
948 return;
949 }
950
951 ISize size = image->GetSize();
952 if (size.IsEmpty()) {
953 return;
954 }
955
956 std::optional<Rect> clipped_source =
957 source.Intersection(Rect::MakeSize(size));
958 if (!clipped_source) {
959 return;
960 }
961
962 if (AttemptColorFilterOptimization(image, source, dest, paint, sampler,
963 src_rect_constraint)) {
964 return;
965 }
966
967 if (*clipped_source != source) {
968 Scalar sx = dest.GetWidth() / source.GetWidth();
969 Scalar sy = dest.GetHeight() / source.GetHeight();
970 Scalar tx = dest.GetLeft() - source.GetLeft() * sx;
971 Scalar ty = dest.GetTop() - source.GetTop() * sy;
972 Matrix src_to_dest = Matrix::MakeTranslateScale({sx, sy, 1}, {tx, ty, 0});
973 dest = clipped_source->TransformBounds(src_to_dest);
974 }
975
976 auto texture_contents = TextureContents::MakeRect(dest);
977 texture_contents->SetTexture(image);
978 texture_contents->SetSourceRect(*clipped_source);
979 texture_contents->SetStrictSourceRect(src_rect_constraint ==
980 SourceRectConstraint::kStrict);
981 texture_contents->SetSamplerDescriptor(sampler);
982 texture_contents->SetOpacity(paint.color.alpha);
983 texture_contents->SetDeferApplyingOpacity(paint.HasColorFilter());
984
985 Entity entity;
986 entity.SetBlendMode(paint.blend_mode);
987 entity.SetTransform(GetCurrentTransform());
988
989 if (!paint.mask_blur_descriptor.has_value()) {
990 entity.SetContents(paint.WithFilters(std::move(texture_contents)));
991 AddRenderEntityToCurrentPass(entity);
992 return;
993 }
994
995 FillRectGeometry out_rect(Rect{});
996
997 entity.SetContents(paint.WithFilters(
998 paint.mask_blur_descriptor->CreateMaskBlur(texture_contents, &out_rect)));
999 AddRenderEntityToCurrentPass(entity);
1000 }
1001
1002 size_t Canvas::GetClipHeight() const {
1003 return transform_stack_.back().clip_height;
1004 }
1005
1006 void Canvas::DrawVertices(const std::shared_ptr<VerticesGeometry>& vertices,
1007 BlendMode blend_mode,
1008 const Paint& paint) {
1009 // Override the blend mode with kDestination in order to match the behavior
1010 // of Skia's SK_LEGACY_IGNORE_DRAW_VERTICES_BLEND_WITH_NO_SHADER flag, which
1011 // is enabled when the Flutter engine builds Skia.
1012 if (!paint.color_source) {
1013 blend_mode = BlendMode::kDst;
1014 }
1015
1016 Entity entity;
1017 entity.SetTransform(GetCurrentTransform());
1018 entity.SetBlendMode(paint.blend_mode);
1019
1020 // If there are no vertex colors.
1021 if (UseColorSourceContents(vertices, paint)) {
1022 AddRenderEntityWithFiltersToCurrentPass(entity, vertices.get(), paint);
1023 return;
1024 }
1025
1026 // If the blend mode is destination don't bother to bind or create a texture.
1027 if (blend_mode == BlendMode::kDst) {
1028 auto contents = std::make_shared<VerticesSimpleBlendContents>();
1029 contents->SetBlendMode(blend_mode);
1030 contents->SetAlpha(paint.color.alpha);
1031 contents->SetGeometry(vertices);
1032 entity.SetContents(paint.WithFilters(std::move(contents)));
1033 AddRenderEntityToCurrentPass(entity);
1034 return;
1035 }
1036
1037 // If there is a texture, use this directly. Otherwise render the color
1038 // source to a texture.
1039 if (paint.color_source &&
1040 paint.color_source->type() == flutter::DlColorSourceType::kImage) {
1041 const flutter::DlImageColorSource* image_color_source =
1042 paint.color_source->asImage();
1043 FML_DCHECK(image_color_source &&
1044 image_color_source->image()->impeller_texture());
1045 auto texture = image_color_source->image()->impeller_texture();
1046 auto x_tile_mode = static_cast<Entity::TileMode>(
1047 image_color_source->horizontal_tile_mode());
1048 auto y_tile_mode =
1049 static_cast<Entity::TileMode>(image_color_source->vertical_tile_mode());
1050 auto sampler_descriptor =
1051 skia_conversions::ToSamplerDescriptor(image_color_source->sampling());
1052 auto effect_transform = image_color_source->matrix();
1053
1054 auto contents = std::make_shared<VerticesSimpleBlendContents>();
1055 contents->SetBlendMode(blend_mode);
1056 contents->SetAlpha(paint.color.alpha);
1057 contents->SetGeometry(vertices);
1058 contents->SetEffectTransform(effect_transform);
1059 contents->SetTexture(texture);
1060 contents->SetTileMode(x_tile_mode, y_tile_mode);
1061 contents->SetSamplerDescriptor(sampler_descriptor);
1062
1063 entity.SetContents(paint.WithFilters(std::move(contents)));
1064 AddRenderEntityToCurrentPass(entity);
1065 return;
1066 }
1067
1068 auto src_paint = paint;
1069 src_paint.color = paint.color.WithAlpha(1.0);
1070
1071 std::shared_ptr<ColorSourceContents> src_contents =
1072 src_paint.CreateContents();
1073 src_contents->SetGeometry(vertices.get());
1074
1075 // If the color source has an intrinsic size, then we use that to
1076 // create the src contents as a simplification. Otherwise we use
1077 // the extent of the texture coordinates to determine how large
1078 // the src contents should be. If neither has a value we fall back
1079 // to using the geometry coverage data.
1080 Rect src_coverage;
1081 auto size = src_contents->GetColorSourceSize();
1082 if (size.has_value()) {
1083 src_coverage = Rect::MakeXYWH(0, 0, size->width, size->height);
1084 } else {
1085 auto cvg = vertices->GetCoverage(Matrix{});
1086 FML_CHECK(cvg.has_value());
1087 auto texture_coverage = vertices->GetTextureCoordinateCoverage();
1088 if (texture_coverage.has_value()) {
1089 src_coverage =
1090 Rect::MakeOriginSize(texture_coverage->GetOrigin(),
1091 texture_coverage->GetSize().Max({1, 1}));
1092 } else {
1093 // NOLINTNEXTLINE(bugprone-unchecked-optional-access)
1094 src_coverage = cvg.value();
1095 }
1096 }
1097 src_contents = src_paint.CreateContents();
1098
1099 clip_geometry_.push_back(Geometry::MakeRect(Rect::Round(src_coverage)));
1100 src_contents->SetGeometry(clip_geometry_.back().get());
1101
1102 auto contents = std::make_shared<VerticesSimpleBlendContents>();
1103 contents->SetBlendMode(blend_mode);
1104 contents->SetAlpha(paint.color.alpha);
1105 contents->SetGeometry(vertices);
1106 contents->SetLazyTextureCoverage(src_coverage);
1107 contents->SetLazyTexture([src_contents,
1108 src_coverage](const ContentContext& renderer) {
1109 // Applying the src coverage as the coverage limit prevents the 1px
1110 // coverage pad from adding a border that is picked up by developer
1111 // specified UVs.
1112 auto snapshot =
1113 src_contents->RenderToSnapshot(renderer, {}, Rect::Round(src_coverage));
1114 return snapshot.has_value() ? snapshot->texture : nullptr;
1115 });
1116 entity.SetContents(paint.WithFilters(std::move(contents)));
1117 AddRenderEntityToCurrentPass(entity);
1118 }
1119
1120 void Canvas::DrawAtlas(const std::shared_ptr<AtlasContents>& atlas_contents,
1121 const Paint& paint) {
1122 atlas_contents->SetAlpha(paint.color.alpha);
1123
1124 Entity entity;
1125 entity.SetTransform(GetCurrentTransform());
1126 entity.SetBlendMode(paint.blend_mode);
1127 entity.SetContents(paint.WithFilters(atlas_contents));
1128
1129 AddRenderEntityToCurrentPass(entity);
1130 }
1131
1132 /// Compositor Functionality
1133 /////////////////////////////////////////
1134
1135 void Canvas::SetupRenderPass() {
1136 renderer_.GetRenderTargetCache()->Start();
1137 ColorAttachment color0 = render_target_.GetColorAttachment(0);
1138
1139 auto& stencil_attachment = render_target_.GetStencilAttachment();
1140 auto& depth_attachment = render_target_.GetDepthAttachment();
1141 if (!stencil_attachment.has_value() || !depth_attachment.has_value()) {
1142 // Setup a new root stencil with an optimal configuration if one wasn't
1143 // provided by the caller.
1144 render_target_.SetupDepthStencilAttachments(
1145 *renderer_.GetContext(),
1146 *renderer_.GetContext()->GetResourceAllocator(),
1147 color0.texture->GetSize(),
1148 renderer_.GetContext()->GetCapabilities()->SupportsOffscreenMSAA(),
1149 "ImpellerOnscreen", kDefaultStencilConfig);
1150 }
1151
1152 // Set up the clear color of the root pass.
1153 color0.clear_color = Color::BlackTransparent();
1154 render_target_.SetColorAttachment(color0, 0);
1155
1156 // If requires_readback is true, then there is a backdrop filter or emulated
1157 // advanced blend in the first save layer. This requires a readback, which
1158 // isn't supported by onscreen textures. To support this, we immediately begin
1159 // a second save layer with the same dimensions as the onscreen. When
1160 // rendering is completed, we must blit this saveLayer to the onscreen.
1161 if (requires_readback_) {
1162 auto entity_pass_target =
1163 CreateRenderTarget(renderer_, //
1164 color0.texture->GetSize(), //
1165 /*clear_color=*/Color::BlackTransparent());
1166 render_passes_.push_back(
1167 LazyRenderingConfig(renderer_, std::move(entity_pass_target)));
1168 } else {
1169 auto entity_pass_target = std::make_unique<EntityPassTarget>(
1170 render_target_, //
1171 renderer_.GetDeviceCapabilities().SupportsReadFromResolve(), //
1172 renderer_.GetDeviceCapabilities().SupportsImplicitResolvingMSAA() //
1173 );
1174 render_passes_.push_back(
1175 LazyRenderingConfig(renderer_, std::move(entity_pass_target)));
1176 }
1177 }
1178
1179 void Canvas::SkipUntilMatchingRestore(size_t total_content_depth) {
1180 auto entry = CanvasStackEntry{};
1181 entry.skipping = true;
1182 entry.clip_depth = current_depth_ + total_content_depth;
1183 transform_stack_.push_back(entry);
1184 }
1185
1186 void Canvas::Save(uint32_t total_content_depth) {
1187 if (IsSkipping()) {
1188 return SkipUntilMatchingRestore(total_content_depth);
1189 }
1190
1191 auto entry = CanvasStackEntry{};
1192 entry.transform = transform_stack_.back().transform;
1193 entry.clip_depth = current_depth_ + total_content_depth;
1194 entry.distributed_opacity = transform_stack_.back().distributed_opacity;
1195 FML_DCHECK(entry.clip_depth <= transform_stack_.back().clip_depth)
1196 << entry.clip_depth << " <=? " << transform_stack_.back().clip_depth
1197 << " after allocating " << total_content_depth;
1198 entry.clip_height = transform_stack_.back().clip_height;
1199 entry.rendering_mode = Entity::RenderingMode::kDirect;
1200 transform_stack_.push_back(entry);
1201 }
1202
1203 std::optional<Rect> Canvas::GetLocalCoverageLimit() const {
1204 if (!clip_coverage_stack_.HasCoverage()) {
1205 // The current clip is empty. This means the pass texture won't be
1206 // visible, so skip it.
1207 return std::nullopt;
1208 }
1209
1210 std::optional<Rect> maybe_current_clip_coverage =
1211 clip_coverage_stack_.CurrentClipCoverage();
1212 if (!maybe_current_clip_coverage.has_value()) {
1213 return std::nullopt;
1214 }
1215
1216 Rect current_clip_coverage = maybe_current_clip_coverage.value();
1217
1218 FML_CHECK(!render_passes_.empty());
1219 const LazyRenderingConfig& back_render_pass = render_passes_.back();
1220 std::shared_ptr<Texture> back_texture =
1221 back_render_pass.GetInlinePassContext()->GetTexture();
1222 FML_CHECK(back_texture) << "Context is valid:"
1223 << back_render_pass.GetInlinePassContext()->IsValid();
1224
1225 // The maximum coverage of the subpass. Subpasses textures should never
1226 // extend outside the parent pass texture or the current clip coverage.
1227 std::optional<Rect> maybe_coverage_limit =
1228 Rect::MakeOriginSize(GetGlobalPassPosition(),
1229 Size(back_texture->GetSize()))
1230 .Intersection(current_clip_coverage);
1231
1232 if (!maybe_coverage_limit.has_value() || maybe_coverage_limit->IsEmpty()) {
1233 return std::nullopt;
1234 }
1235
1236 return maybe_coverage_limit->Intersection(
1237 Rect::MakeSize(render_target_.GetRenderTargetSize()));
1238 }
1239
1240 void Canvas::SaveLayer(const Paint& paint,
1241 std::optional<Rect> bounds,
1242 const flutter::DlImageFilter* backdrop_filter,
1243 ContentBoundsPromise bounds_promise,
1244 uint32_t total_content_depth,
1245 bool can_distribute_opacity,
1246 std::optional<int64_t> backdrop_id) {
1247 TRACE_EVENT0("flutter", "Canvas::saveLayer");
1248 if (IsSkipping()) {
1249 return SkipUntilMatchingRestore(total_content_depth);
1250 }
1251
1252 auto maybe_coverage_limit = GetLocalCoverageLimit();
1253 if (!maybe_coverage_limit.has_value()) {
1254 return SkipUntilMatchingRestore(total_content_depth);
1255 }
1256 auto coverage_limit = maybe_coverage_limit.value();
1257
1258 if (can_distribute_opacity && !backdrop_filter &&
1259 Paint::CanApplyOpacityPeephole(paint) &&
1260 bounds_promise != ContentBoundsPromise::kMayClipContents) {
1261 Save(total_content_depth);
1262 transform_stack_.back().distributed_opacity *= paint.color.alpha;
1263 return;
1264 }
1265
1266 std::shared_ptr<FilterContents> filter_contents = paint.WithImageFilter(
1267 Rect(), transform_stack_.back().transform,
1268 Entity::RenderingMode::kSubpassPrependSnapshotTransform);
1269
1270 std::optional<Rect> maybe_subpass_coverage = ComputeSaveLayerCoverage(
1271 bounds.value_or(Rect::MakeMaximum()),
1272 transform_stack_.back().transform, //
1273 coverage_limit, //
1274 filter_contents, //
1275 /*flood_output_coverage=*/
1276 Entity::IsBlendModeDestructive(paint.blend_mode), //
1277 /*flood_input_coverage=*/!!backdrop_filter ||
1278 (paint.color_filter &&
1279 paint.color_filter->modifies_transparent_black()) //
1280 );
1281
1282 if (!maybe_subpass_coverage.has_value()) {
1283 return SkipUntilMatchingRestore(total_content_depth);
1284 }
1285
1286 auto subpass_coverage = maybe_subpass_coverage.value();
1287
1288 // When an image filter is present, clamp to avoid flicking due to nearest
1289 // sampled image. For other cases, round out to ensure than any geometry is
1290 // not cut off.
1291 //
1292 // See also this bug: https://github.com/flutter/flutter/issues/144213
1293 //
1294 // TODO(jonahwilliams): this could still round out for filters that use decal
1295 // sampling mode.
1296 ISize subpass_size;
1297 bool did_round_out = false;
1298 Point coverage_origin_adjustment = Point{0, 0};
1299 if (paint.image_filter) {
1300 subpass_size = ISize(subpass_coverage.GetSize());
1301 } else {
1302 did_round_out = true;
1303 subpass_size =
1304 static_cast<ISize>(IRect::RoundOut(subpass_coverage).GetSize());
1305 // If rounding out, adjust the coverage to account for the subpixel shift.
1306 coverage_origin_adjustment =
1307 Point(subpass_coverage.GetLeftTop().x -
1308 std::floor(subpass_coverage.GetLeftTop().x),
1309 subpass_coverage.GetLeftTop().y -
1310 std::floor(subpass_coverage.GetLeftTop().y));
1311 }
1312 if (subpass_size.IsEmpty()) {
1313 return SkipUntilMatchingRestore(total_content_depth);
1314 }
1315
1316 // When there are scaling filters present, these contents may exceed the
1317 // maximum texture size. Perform a clamp here, which may cause rendering
1318 // artifacts.
1319 subpass_size = subpass_size.Min(renderer_.GetContext()
1320 ->GetCapabilities()
1321 ->GetMaximumRenderPassAttachmentSize());
1322
1323 // Backdrop filter state, ignored if there is no BDF.
1324 std::shared_ptr<FilterContents> backdrop_filter_contents;
1325 Point local_position = Point(0, 0);
1326 if (backdrop_filter) {
1327 local_position = subpass_coverage.GetOrigin() - GetGlobalPassPosition();
1328 Canvas::BackdropFilterProc backdrop_filter_proc =
1329 [backdrop_filter = backdrop_filter](
1330 const FilterInput::Ref& input, const Matrix& effect_transform,
1331 Entity::RenderingMode rendering_mode) {
1332 auto filter = WrapInput(backdrop_filter, input);
1333 filter->SetEffectTransform(effect_transform);
1334 filter->SetRenderingMode(rendering_mode);
1335 return filter;
1336 };
1337
1338 std::shared_ptr<Texture> input_texture;
1339
1340 // If the backdrop ID is not nullopt and there is more than one usage
1341 // of it in the current scene, cache the backdrop texture and remove it from
1342 // the current entity pass flip.
1343 bool will_cache_backdrop_texture = false;
1344 BackdropData* backdrop_data = nullptr;
1345 // If we've reached this point, there is at least one backdrop filter. But
1346 // potentially more if there is a backdrop id. We may conditionally set this
1347 // to a higher value in the if block below.
1348 size_t backdrop_count = 1;
1349 if (backdrop_id.has_value()) {
1350 std::unordered_map<int64_t, BackdropData>::iterator backdrop_data_it =
1351 backdrop_data_.find(backdrop_id.value());
1352 if (backdrop_data_it != backdrop_data_.end()) {
1353 backdrop_data = &backdrop_data_it->second;
1354 will_cache_backdrop_texture =
1355 backdrop_data_it->second.backdrop_count > 1;
1356 backdrop_count = backdrop_data_it->second.backdrop_count;
1357 }
1358 }
1359
1360 if (!will_cache_backdrop_texture || !backdrop_data->texture_slot) {
1361 backdrop_count_ -= backdrop_count;
1362
1363 // The onscreen texture can be flipped to if:
1364 // 1. The device supports framebuffer fetch
1365 // 2. There are no more backdrop filters
1366 // 3. The current render pass is for the onscreen pass.
1367 const bool should_use_onscreen =
1368 renderer_.GetDeviceCapabilities().SupportsFramebufferFetch() &&
1369 backdrop_count_ == 0 && render_passes_.size() == 1u;
1370 input_texture = FlipBackdrop(
1371 GetGlobalPassPosition(), //
1372 /*should_remove_texture=*/will_cache_backdrop_texture, //
1373 /*should_use_onscreen=*/should_use_onscreen //
1374 );
1375 if (!input_texture) {
1376 // Validation failures are logged in FlipBackdrop.
1377 return;
1378 }
1379
1380 if (will_cache_backdrop_texture) {
1381 backdrop_data->texture_slot = input_texture;
1382 }
1383 } else {
1384 input_texture = backdrop_data->texture_slot;
1385 }
1386
1387 backdrop_filter_contents = backdrop_filter_proc(
1388 FilterInput::Make(std::move(input_texture)),
1389 transform_stack_.back().transform.Basis(),
1390 // When the subpass has a translation that means the math with
1391 // the snapshot has to be different.
1392 transform_stack_.back().transform.HasTranslation()
1393 ? Entity::RenderingMode::kSubpassPrependSnapshotTransform
1394 : Entity::RenderingMode::kSubpassAppendSnapshotTransform);
1395
1396 if (will_cache_backdrop_texture) {
1397 FML_DCHECK(backdrop_data);
1398 // If all filters on the shared backdrop layer are equal, process the
1399 // layer once.
1400 if (backdrop_data->all_filters_equal &&
1401 !backdrop_data->shared_filter_snapshot.has_value()) {
1402 // TODO(157110): compute minimum input hint.
1403 backdrop_data->shared_filter_snapshot =
1404 backdrop_filter_contents->RenderToSnapshot(renderer_, {});
1405 }
1406
1407 std::optional<Snapshot> maybe_snapshot =
1408 backdrop_data->shared_filter_snapshot;
1409 if (maybe_snapshot.has_value()) {
1410 const Snapshot& snapshot = maybe_snapshot.value();
1411 std::shared_ptr<TextureContents> contents = TextureContents::MakeRect(
1412 subpass_coverage.Shift(-GetGlobalPassPosition()));
1413 auto scaled =
1414 subpass_coverage.TransformBounds(snapshot.transform.Invert());
1415 contents->SetTexture(snapshot.texture);
1416 contents->SetSourceRect(scaled);
1417 contents->SetSamplerDescriptor(snapshot.sampler_descriptor);
1418
1419 // This backdrop entity sets a depth value as it is written to the newly
1420 // flipped backdrop and not into a new saveLayer.
1421 Entity backdrop_entity;
1422 backdrop_entity.SetContents(std::move(contents));
1423 backdrop_entity.SetClipDepth(++current_depth_);
1424 backdrop_entity.SetBlendMode(paint.blend_mode);
1425
1426 backdrop_entity.Render(renderer_, GetCurrentRenderPass());
1427 Save(0);
1428 return;
1429 }
1430 }
1431 }
1432
1433 // When applying a save layer, absorb any pending distributed opacity.
1434 Paint paint_copy = paint;
1435 paint_copy.color.alpha *= transform_stack_.back().distributed_opacity;
1436 transform_stack_.back().distributed_opacity = 1.0;
1437
1438 render_passes_.push_back(
1439 LazyRenderingConfig(renderer_, //
1440 CreateRenderTarget(renderer_, //
1441 subpass_size, //
1442 Color::BlackTransparent() //
1443 )));
1444 save_layer_state_.push_back(SaveLayerState{
1445 paint_copy, subpass_coverage.Shift(-coverage_origin_adjustment)});
1446
1447 CanvasStackEntry entry;
1448 entry.transform = transform_stack_.back().transform;
1449 entry.clip_depth = current_depth_ + total_content_depth;
1450 FML_DCHECK(entry.clip_depth <= transform_stack_.back().clip_depth)
1451 << entry.clip_depth << " <=? " << transform_stack_.back().clip_depth
1452 << " after allocating " << total_content_depth;
1453 entry.clip_height = transform_stack_.back().clip_height;
1454 entry.rendering_mode = Entity::RenderingMode::kSubpassAppendSnapshotTransform;
1455 entry.did_round_out = did_round_out;
1456 transform_stack_.emplace_back(entry);
1457
1458 // Start non-collapsed subpasses with a fresh clip coverage stack limited by
1459 // the subpass coverage. This is important because image filters applied to
1460 // save layers may transform the subpass texture after it's rendered,
1461 // causing parent clip coverage to get misaligned with the actual area that
1462 // the subpass will affect in the parent pass.
1463 clip_coverage_stack_.PushSubpass(subpass_coverage, GetClipHeight());
1464
1465 if (!backdrop_filter_contents) {
1466 return;
1467 }
1468
1469 // Render the backdrop entity.
1470 Entity backdrop_entity;
1471 backdrop_entity.SetContents(std::move(backdrop_filter_contents));
1472 backdrop_entity.SetTransform(
1473 Matrix::MakeTranslation(Vector3(-local_position)));
1474 backdrop_entity.SetClipDepth(std::numeric_limits<uint32_t>::max());
1475 backdrop_entity.Render(renderer_, GetCurrentRenderPass());
1476 }
1477
1478 bool Canvas::Restore() {
1479 FML_DCHECK(transform_stack_.size() > 0);
1480 if (transform_stack_.size() == 1) {
1481 return false;
1482 }
1483
1484 // This check is important to make sure we didn't exceed the depth
1485 // that the clips were rendered at while rendering any of the
1486 // rendering ops. It is OK for the current depth to equal the
1487 // outgoing clip depth because that means the clipping would have
1488 // been successful up through the last rendering op, but it cannot
1489 // be greater.
1490 // Also, we bump the current rendering depth to the outgoing clip
1491 // depth so that future rendering operations are not clipped by
1492 // any of the pixels set by the expiring clips. It is OK for the
1493 // estimates used to determine the clip depth in save/saveLayer
1494 // to be overly conservative, but we need to jump the depth to
1495 // the clip depth so that the next rendering op will get a
1496 // larger depth (it will pre-increment the current_depth_ value).
1497 FML_DCHECK(current_depth_ <= transform_stack_.back().clip_depth)
1498 << current_depth_ << " <=? " << transform_stack_.back().clip_depth;
1499 current_depth_ = transform_stack_.back().clip_depth;
1500
1501 if (IsSkipping()) {
1502 transform_stack_.pop_back();
1503 return true;
1504 }
1505
1506 if (transform_stack_.back().rendering_mode ==
1507 Entity::RenderingMode::kSubpassAppendSnapshotTransform ||
1508 transform_stack_.back().rendering_mode ==
1509 Entity::RenderingMode::kSubpassPrependSnapshotTransform) {
1510 auto lazy_render_pass = std::move(render_passes_.back());
1511 render_passes_.pop_back();
1512 // Force the render pass to be constructed if it never was.
1513 lazy_render_pass.GetInlinePassContext()->GetRenderPass();
1514
1515 SaveLayerState save_layer_state = save_layer_state_.back();
1516 save_layer_state_.pop_back();
1517 auto global_pass_position = GetGlobalPassPosition();
1518
1519 std::shared_ptr<Contents> contents = CreateContentsForSubpassTarget(
1520 save_layer_state.paint, //
1521 lazy_render_pass.GetInlinePassContext()->GetTexture(), //
1522 Matrix::MakeTranslation(Vector3{-global_pass_position}) * //
1523 transform_stack_.back().transform //
1524 );
1525
1526 lazy_render_pass.GetInlinePassContext()->EndPass();
1527
1528 // Round the subpass texture position for pixel alignment with the parent
1529 // pass render target. By default, we draw subpass textures with nearest
1530 // sampling, so aligning here is important for avoiding visual nearest
1531 // sampling errors caused by limited floating point precision when
1532 // straddling a half pixel boundary.
1533 Point subpass_texture_position;
1534 if (transform_stack_.back().did_round_out) {
1535 // Subpass coverage was rounded out, origin potentially moved "down" by
1536 // as much as a pixel.
1537 subpass_texture_position =
1538 (save_layer_state.coverage.GetOrigin() - global_pass_position)
1539 .Floor();
1540 } else {
1541 // Subpass coverage was truncated. Pick the closest phyiscal pixel.
1542 subpass_texture_position =
1543 (save_layer_state.coverage.GetOrigin() - global_pass_position)
1544 .Round();
1545 }
1546
1547 Entity element_entity;
1548 element_entity.SetClipDepth(++current_depth_);
1549 element_entity.SetContents(std::move(contents));
1550 element_entity.SetBlendMode(save_layer_state.paint.blend_mode);
1551 element_entity.SetTransform(
1552 Matrix::MakeTranslation(Vector3(subpass_texture_position)));
1553
1554 if (element_entity.GetBlendMode() > Entity::kLastPipelineBlendMode) {
1555 if (renderer_.GetDeviceCapabilities().SupportsFramebufferFetch()) {
1556 ApplyFramebufferBlend(element_entity);
1557 } else {
1558 // End the active pass and flush the buffer before rendering "advanced"
1559 // blends. Advanced blends work by binding the current render target
1560 // texture as an input ("destination"), blending with a second texture
1561 // input ("source"), writing the result to an intermediate texture, and
1562 // finally copying the data from the intermediate texture back to the
1563 // render target texture. And so all of the commands that have written
1564 // to the render target texture so far need to execute before it's bound
1565 // for blending (otherwise the blend pass will end up executing before
1566 // all the previous commands in the active pass).
1567 auto input_texture = FlipBackdrop(GetGlobalPassPosition());
1568 if (!input_texture) {
1569 return false;
1570 }
1571
1572 FilterInput::Vector inputs = {
1573 FilterInput::Make(input_texture,
1574 element_entity.GetTransform().Invert()),
1575 FilterInput::Make(element_entity.GetContents())};
1576 auto contents = ColorFilterContents::MakeBlend(
1577 element_entity.GetBlendMode(), inputs);
1578 contents->SetCoverageHint(element_entity.GetCoverage());
1579 element_entity.SetContents(std::move(contents));
1580 element_entity.SetBlendMode(BlendMode::kSrc);
1581 }
1582 }
1583
1584 element_entity.Render(
1585 renderer_, //
1586 *render_passes_.back().GetInlinePassContext()->GetRenderPass() //
1587 );
1588 clip_coverage_stack_.PopSubpass();
1589 transform_stack_.pop_back();
1590
1591 // We don't need to restore clips if a saveLayer was performed, as the clip
1592 // state is per render target, and no more rendering operations will be
1593 // performed as the render target workloaded is completed in the restore.
1594 return true;
1595 }
1596
1597 size_t num_clips = transform_stack_.back().num_clips;
1598 transform_stack_.pop_back();
1599
1600 if (num_clips > 0) {
1601 EntityPassClipStack::ClipStateResult clip_state_result =
1602 clip_coverage_stack_.RecordRestore(GetGlobalPassPosition(),
1603 GetClipHeight());
1604
1605 // Clip restores are never required with depth based clipping.
1606 FML_DCHECK(!clip_state_result.should_render);
1607 if (clip_state_result.clip_did_change) {
1608 // We only need to update the pass scissor if the clip state has changed.
1609 SetClipScissor(
1610 clip_coverage_stack_.CurrentClipCoverage(), //
1611 *render_passes_.back().GetInlinePassContext()->GetRenderPass(), //
1612 GetGlobalPassPosition() //
1613 );
1614 }
1615 }
1616
1617 return true;
1618 }
1619
1620 bool Canvas::AttemptBlurredTextOptimization(
1621 const std::shared_ptr<TextFrame>& text_frame,
1622 const std::shared_ptr<TextContents>& text_contents,
1623 Entity& entity,
1624 const Paint& paint) {
1625 if (!paint.mask_blur_descriptor.has_value() || //
1626 paint.image_filter != nullptr || //
1627 paint.color_filter != nullptr || //
1628 paint.invert_colors) {
1629 return false;
1630 }
1631
1632 // TODO(bdero): This mask blur application is a hack. It will always wind up
1633 // doing a gaussian blur that affects the color source itself
1634 // instead of just the mask. The color filter text support
1635 // needs to be reworked in order to interact correctly with
1636 // mask filters.
1637 // https://github.com/flutter/flutter/issues/133297
1638 std::shared_ptr<FilterContents> filter =
1639 paint.mask_blur_descriptor->CreateMaskBlur(
1640 FilterInput::Make(text_contents),
1641 /*is_solid_color=*/true, GetCurrentTransform());
1642
1643 std::optional<Glyph> maybe_glyph = text_frame->AsSingleGlyph();
1644 int64_t identifier = maybe_glyph.has_value()
1645 ? maybe_glyph.value().index
1646 : reinterpret_cast<int64_t>(text_frame.get());
1647 TextShadowCache::TextShadowCacheKey cache_key(
1648 /*p_max_basis=*/entity.GetTransform().GetMaxBasisLengthXY(),
1649 /*p_identifier=*/identifier,
1650 /*p_is_single_glyph=*/maybe_glyph.has_value(),
1651 /*p_font=*/text_frame->GetFont(),
1652 /*p_sigma=*/paint.mask_blur_descriptor->sigma);
1653
1654 std::optional<Entity> result = renderer_.GetTextShadowCache().Lookup(
1655 renderer_, entity, filter, cache_key);
1656 if (result.has_value()) {
1657 AddRenderEntityToCurrentPass(result.value(), /*reuse_depth=*/false);
1658 return true;
1659 } else {
1660 return false;
1661 }
1662 }
1663
1664 // If the text point size * max basis XY is larger than this value,
1665 // render the text as paths (if available) for faster and higher
1666 // fidelity rendering. This is a somewhat arbitrary cutoff
1667 static constexpr Scalar kMaxTextScale = 250;
1668
1669 void Canvas::DrawTextFrame(const std::shared_ptr<TextFrame>& text_frame,
1670 Point position,
1671 const Paint& paint) {
1672 Scalar max_scale = GetCurrentTransform().GetMaxBasisLengthXY();
1673 if (max_scale * text_frame->GetFont().GetMetrics().point_size >
1674 kMaxTextScale) {
1675 fml::StatusOr<flutter::DlPath> path = text_frame->GetPath();
1676 if (path.ok()) {
1677 Save(1);
1678 Concat(Matrix::MakeTranslation(position));
1679 DrawPath(path.value(), paint);
1680 Restore();
1681 return;
1682 }
1683 }
1684
1685 Entity entity;
1686 entity.SetClipDepth(GetClipHeight());
1687 entity.SetBlendMode(paint.blend_mode);
1688
1689 auto text_contents = std::make_shared<TextContents>();
1690 text_contents->SetTextFrame(text_frame);
1691 text_contents->SetForceTextColor(paint.mask_blur_descriptor.has_value());
1692 text_contents->SetScale(max_scale);
1693 text_contents->SetColor(paint.color);
1694 text_contents->SetOffset(position);
1695 text_contents->SetTextProperties(paint.color,
1696 paint.style == Paint::Style::kStroke
1697 ? std::optional(paint.stroke)
1698 : std::nullopt);
1699
1700 entity.SetTransform(GetCurrentTransform() *
1701 Matrix::MakeTranslation(position));
1702
1703 if (AttemptBlurredTextOptimization(text_frame, text_contents, entity,
1704 paint)) {
1705 return;
1706 }
1707
1708 entity.SetContents(paint.WithFilters(std::move(text_contents)));
1709 AddRenderEntityToCurrentPass(entity, false);
1710 }
1711
1712 void Canvas::AddRenderEntityWithFiltersToCurrentPass(Entity& entity,
1713 const Geometry* geometry,
1714 const Paint& paint,
1715 bool reuse_depth) {
1716 std::shared_ptr<ColorSourceContents> contents = paint.CreateContents();
1717 if (!paint.color_filter && !paint.invert_colors && !paint.image_filter &&
1718 !paint.mask_blur_descriptor.has_value()) {
1719 contents->SetGeometry(geometry);
1720 entity.SetContents(std::move(contents));
1721 AddRenderEntityToCurrentPass(entity, reuse_depth);
1722 return;
1723 }
1724
1725 // Attempt to apply the color filter on the CPU first.
1726 // Note: This is not just an optimization; some color sources rely on
1727 // CPU-applied color filters to behave properly.
1728 bool needs_color_filter = paint.color_filter || paint.invert_colors;
1729 if (needs_color_filter &&
1730 contents->ApplyColorFilter([&](Color color) -> Color {
1731 if (paint.color_filter) {
1732 color = GetCPUColorFilterProc(paint.color_filter)(color);
1733 }
1734 if (paint.invert_colors) {
1735 color = color.ApplyColorMatrix(kColorInversion);
1736 }
1737 return color;
1738 })) {
1739 needs_color_filter = false;
1740 }
1741
1742 bool can_apply_mask_filter = geometry->CanApplyMaskFilter();
1743 contents->SetGeometry(geometry);
1744
1745 if (can_apply_mask_filter && paint.mask_blur_descriptor.has_value()) {
1746 // If there's a mask blur and we need to apply the color filter on the GPU,
1747 // we need to be careful to only apply the color filter to the source
1748 // colors. CreateMaskBlur is able to handle this case.
1749 FillRectGeometry out_rect(Rect{});
1750 auto filter_contents = paint.mask_blur_descriptor->CreateMaskBlur(
1751 contents, needs_color_filter ? paint.color_filter : nullptr,
1752 needs_color_filter ? paint.invert_colors : false, &out_rect);
1753 entity.SetContents(std::move(filter_contents));
1754 AddRenderEntityToCurrentPass(entity, reuse_depth);
1755 return;
1756 }
1757
1758 std::shared_ptr<Contents> contents_copy = std::move(contents);
1759
1760 // Image input types will directly set their color filter,
1761 // if any. See `TiledTextureContents.SetColorFilter`.
1762 if (needs_color_filter &&
1763 (!paint.color_source ||
1764 paint.color_source->type() != flutter::DlColorSourceType::kImage)) {
1765 if (paint.color_filter) {
1766 contents_copy = WrapWithGPUColorFilter(
1767 paint.color_filter, FilterInput::Make(std::move(contents_copy)),
1768 ColorFilterContents::AbsorbOpacity::kYes);
1769 }
1770 if (paint.invert_colors) {
1771 contents_copy =
1772 WrapWithInvertColors(FilterInput::Make(std::move(contents_copy)),
1773 ColorFilterContents::AbsorbOpacity::kYes);
1774 }
1775 }
1776
1777 if (paint.image_filter) {
1778 std::shared_ptr<FilterContents> filter = WrapInput(
1779 paint.image_filter, FilterInput::Make(std::move(contents_copy)));
1780 filter->SetRenderingMode(Entity::RenderingMode::kDirect);
1781 entity.SetContents(filter);
1782 AddRenderEntityToCurrentPass(entity, reuse_depth);
1783 return;
1784 }
1785
1786 entity.SetContents(std::move(contents_copy));
1787 AddRenderEntityToCurrentPass(entity, reuse_depth);
1788 }
1789
1790 void Canvas::AddRenderEntityToCurrentPass(Entity& entity, bool reuse_depth) {
1791 if (IsSkipping()) {
1792 return;
1793 }
1794
1795 entity.SetTransform(
1796 Matrix::MakeTranslation(Vector3(-GetGlobalPassPosition())) *
1797 entity.GetTransform());
1798 entity.SetInheritedOpacity(transform_stack_.back().distributed_opacity);
1799 if (entity.GetBlendMode() == BlendMode::kSrcOver &&
1800 entity.GetContents()->IsOpaque(entity.GetTransform())) {
1801 entity.SetBlendMode(BlendMode::kSrc);
1802 }
1803
1804 // If the entity covers the current render target and is a solid color, then
1805 // conditionally update the backdrop color to its solid color value blended
1806 // with the current backdrop.
1807 if (render_passes_.back().IsApplyingClearColor()) {
1808 std::optional<Color> maybe_color = entity.AsBackgroundColor(
1809 render_passes_.back().GetInlinePassContext()->GetTexture()->GetSize());
1810 if (maybe_color.has_value()) {
1811 Color color = maybe_color.value();
1812 RenderTarget& render_target = render_passes_.back()
1813 .GetInlinePassContext()
1814 ->GetPassTarget()
1815 .GetRenderTarget();
1816 ColorAttachment attachment = render_target.GetColorAttachment(0);
1817 // Attachment.clear color needs to be premultiplied at all times, but the
1818 // Color::Blend function requires unpremultiplied colors.
1819 attachment.clear_color = attachment.clear_color.Unpremultiply()
1820 .Blend(color, entity.GetBlendMode())
1821 .Premultiply();
1822 render_target.SetColorAttachment(attachment, 0u);
1823 return;
1824 }
1825 }
1826 if (!reuse_depth) {
1827 ++current_depth_;
1828 }
1829
1830 // We can render at a depth up to and including the depth of the currently
1831 // active clips and we will still be clipped out, but we cannot render at
1832 // a depth that is greater than the current clips or we will not be clipped.
1833 FML_DCHECK(current_depth_ <= transform_stack_.back().clip_depth)
1834 << current_depth_ << " <=? " << transform_stack_.back().clip_depth;
1835 entity.SetClipDepth(current_depth_);
1836
1837 if (entity.GetBlendMode() > Entity::kLastPipelineBlendMode) {
1838 if (renderer_.GetDeviceCapabilities().SupportsFramebufferFetch()) {
1839 ApplyFramebufferBlend(entity);
1840 } else {
1841 // End the active pass and flush the buffer before rendering "advanced"
1842 // blends. Advanced blends work by binding the current render target
1843 // texture as an input ("destination"), blending with a second texture
1844 // input ("source"), writing the result to an intermediate texture, and
1845 // finally copying the data from the intermediate texture back to the
1846 // render target texture. And so all of the commands that have written
1847 // to the render target texture so far need to execute before it's bound
1848 // for blending (otherwise the blend pass will end up executing before
1849 // all the previous commands in the active pass).
1850 auto input_texture = FlipBackdrop(GetGlobalPassPosition(), //
1851 /*should_remove_texture=*/false,
1852 /*should_use_onscreen=*/false,
1853 /*post_depth_increment=*/true);
1854 if (!input_texture) {
1855 return;
1856 }
1857
1858 // The coverage hint tells the rendered Contents which portion of the
1859 // rendered output will actually be used, and so we set this to the
1860 // current clip coverage (which is the max clip bounds). The contents may
1861 // optionally use this hint to avoid unnecessary rendering work.
1862 auto element_coverage_hint = entity.GetContents()->GetCoverageHint();
1863 entity.GetContents()->SetCoverageHint(Rect::Intersection(
1864 element_coverage_hint, clip_coverage_stack_.CurrentClipCoverage()));
1865
1866 FilterInput::Vector inputs = {
1867 FilterInput::Make(input_texture, entity.GetTransform().Invert()),
1868 FilterInput::Make(entity.GetContents())};
1869 auto contents =
1870 ColorFilterContents::MakeBlend(entity.GetBlendMode(), inputs);
1871 entity.SetContents(std::move(contents));
1872 entity.SetBlendMode(BlendMode::kSrc);
1873 }
1874 }
1875
1876 const std::shared_ptr<RenderPass>& result =
1877 render_passes_.back().GetInlinePassContext()->GetRenderPass();
1878 if (!result) {
1879 // Failure to produce a render pass should be explained by specific errors
1880 // in `InlinePassContext::GetRenderPass()`, so avoid log spam and don't
1881 // append a validation log here.
1882 return;
1883 }
1884
1885 entity.Render(renderer_, *result);
1886 }
1887
1888 RenderPass& Canvas::GetCurrentRenderPass() const {
1889 return *render_passes_.back().GetInlinePassContext()->GetRenderPass();
1890 }
1891
1892 void Canvas::SetBackdropData(
1893 std::unordered_map<int64_t, BackdropData> backdrop_data,
1894 size_t backdrop_count) {
1895 backdrop_data_ = std::move(backdrop_data);
1896 backdrop_count_ = backdrop_count;
1897 }
1898
1899 std::shared_ptr<Texture> Canvas::FlipBackdrop(Point global_pass_position,
1900 bool should_remove_texture,
1901 bool should_use_onscreen,
1902 bool post_depth_increment) {
1903 LazyRenderingConfig rendering_config = std::move(render_passes_.back());
1904 render_passes_.pop_back();
1905
1906 // If the very first thing we render in this EntityPass is a subpass that
1907 // happens to have a backdrop filter or advanced blend, than that backdrop
1908 // filter/blend will sample from an uninitialized texture.
1909 //
1910 // By calling `pass_context.GetRenderPass` here, we force the texture to pass
1911 // through at least one RenderPass with the correct clear configuration before
1912 // any sampling occurs.
1913 //
1914 // In cases where there are no contents, we
1915 // could instead check the clear color and initialize a 1x2 CPU texture
1916 // instead of ending the pass.
1917 rendering_config.GetInlinePassContext()->GetRenderPass();
1918 if (!rendering_config.GetInlinePassContext()->EndPass()) {
1919 VALIDATION_LOG
1920 << "Failed to end the current render pass in order to read from "
1921 "the backdrop texture and apply an advanced blend or backdrop "
1922 "filter.";
1923 // Note: adding this render pass ensures there are no later crashes from
1924 // unbalanced save layers. Ideally, this method would return false and the
1925 // renderer could handle that by terminating dispatch.
1926 render_passes_.emplace_back(std::move(rendering_config));
1927 return nullptr;
1928 }
1929
1930 const std::shared_ptr<Texture>& input_texture =
1931 rendering_config.GetInlinePassContext()->GetTexture();
1932
1933 if (!input_texture) {
1934 VALIDATION_LOG << "Failed to fetch the color texture in order to "
1935 "apply an advanced blend or backdrop filter.";
1936
1937 // Note: see above.
1938 render_passes_.emplace_back(std::move(rendering_config));
1939 return nullptr;
1940 }
1941
1942 if (should_use_onscreen) {
1943 ColorAttachment color0 = render_target_.GetColorAttachment(0);
1944 // When MSAA is being used, we end up overriding the entire backdrop by
1945 // drawing the previous pass texture, and so we don't have to clear it and
1946 // can use kDontCare.
1947 color0.load_action = color0.resolve_texture != nullptr
1948 ? LoadAction::kDontCare
1949 : LoadAction::kLoad;
1950 render_target_.SetColorAttachment(color0, 0);
1951
1952 auto entity_pass_target = std::make_unique<EntityPassTarget>(
1953 render_target_, //
1954 renderer_.GetDeviceCapabilities().SupportsReadFromResolve(), //
1955 renderer_.GetDeviceCapabilities().SupportsImplicitResolvingMSAA() //
1956 );
1957 render_passes_.push_back(
1958 LazyRenderingConfig(renderer_, std::move(entity_pass_target)));
1959 requires_readback_ = false;
1960 } else {
1961 render_passes_.emplace_back(std::move(rendering_config));
1962 // If the current texture is being cached for a BDF we need to ensure we
1963 // don't recycle it during recording; remove it from the entity pass target.
1964 if (should_remove_texture) {
1965 render_passes_.back().GetEntityPassTarget()->RemoveSecondary();
1966 }
1967 }
1968 RenderPass& current_render_pass =
1969 *render_passes_.back().GetInlinePassContext()->GetRenderPass();
1970
1971 // Eagerly restore the BDF contents.
1972
1973 // If the pass context returns a backdrop texture, we need to draw it to the
1974 // current pass. We do this because it's faster and takes significantly less
1975 // memory than storing/loading large MSAA textures. Also, it's not possible
1976 // to blit the non-MSAA resolve texture of the previous pass to MSAA
1977 // textures (let alone a transient one).
1978 Rect size_rect = Rect::MakeSize(input_texture->GetSize());
1979 auto msaa_backdrop_contents = TextureContents::MakeRect(size_rect);
1980 msaa_backdrop_contents->SetStencilEnabled(false);
1981 msaa_backdrop_contents->SetLabel("MSAA backdrop");
1982 msaa_backdrop_contents->SetSourceRect(size_rect);
1983 msaa_backdrop_contents->SetTexture(input_texture);
1984
1985 Entity msaa_backdrop_entity;
1986 msaa_backdrop_entity.SetContents(std::move(msaa_backdrop_contents));
1987 msaa_backdrop_entity.SetBlendMode(BlendMode::kSrc);
1988 msaa_backdrop_entity.SetClipDepth(std::numeric_limits<uint32_t>::max());
1989 if (!msaa_backdrop_entity.Render(renderer_, current_render_pass)) {
1990 VALIDATION_LOG << "Failed to render MSAA backdrop entity.";
1991 return nullptr;
1992 }
1993
1994 // Restore any clips that were recorded before the backdrop filter was
1995 // applied.
1996 auto& replay_entities = clip_coverage_stack_.GetReplayEntities();
1997 uint64_t current_depth =
1998 post_depth_increment ? current_depth_ - 1 : current_depth_;
1999 for (const auto& replay : replay_entities) {
2000 if (replay.clip_depth <= current_depth) {
2001 continue;
2002 }
2003
2004 SetClipScissor(replay.clip_coverage, current_render_pass,
2005 global_pass_position);
2006 if (!replay.clip_contents.Render(renderer_, current_render_pass,
2007 replay.clip_depth)) {
2008 VALIDATION_LOG << "Failed to render entity for clip restore.";
2009 }
2010 }
2011
2012 return input_texture;
2013 }
2014
2015 bool Canvas::SupportsBlitToOnscreen() const {
2016 return renderer_.GetContext()
2017 ->GetCapabilities()
2018 ->SupportsTextureToTextureBlits() &&
2019 renderer_.GetContext()->GetBackendType() ==
2020 Context::BackendType::kMetal;
2021 }
2022
2023 bool Canvas::BlitToOnscreen(bool is_onscreen) {
2024 auto command_buffer = renderer_.GetContext()->CreateCommandBuffer();
2025 command_buffer->SetLabel("EntityPass Root Command Buffer");
2026 auto offscreen_target = render_passes_.back()
2027 .GetInlinePassContext()
2028 ->GetPassTarget()
2029 .GetRenderTarget();
2030 if (SupportsBlitToOnscreen()) {
2031 auto blit_pass = command_buffer->CreateBlitPass();
2032 blit_pass->AddCopy(offscreen_target.GetRenderTargetTexture(),
2033 render_target_.GetRenderTargetTexture());
2034 if (!blit_pass->EncodeCommands()) {
2035 VALIDATION_LOG << "Failed to encode root pass blit command.";
2036 return false;
2037 }
2038 } else {
2039 auto render_pass = command_buffer->CreateRenderPass(render_target_);
2040 render_pass->SetLabel("EntityPass Root Render Pass");
2041
2042 {
2043 auto size_rect = Rect::MakeSize(offscreen_target.GetRenderTargetSize());
2044 auto contents = TextureContents::MakeRect(size_rect);
2045 contents->SetTexture(offscreen_target.GetRenderTargetTexture());
2046 contents->SetSourceRect(size_rect);
2047 contents->SetLabel("Root pass blit");
2048
2049 Entity entity;
2050 entity.SetContents(contents);
2051 entity.SetBlendMode(BlendMode::kSrc);
2052
2053 if (!entity.Render(renderer_, *render_pass)) {
2054 VALIDATION_LOG << "Failed to render EntityPass root blit.";
2055 return false;
2056 }
2057 }
2058
2059 if (!render_pass->EncodeCommands()) {
2060 VALIDATION_LOG << "Failed to encode root pass command buffer.";
2061 return false;
2062 }
2063 }
2064
2065 if (is_onscreen) {
2066 return renderer_.GetContext()->SubmitOnscreen(std::move(command_buffer));
2067 } else {
2068 return renderer_.GetContext()->EnqueueCommandBuffer(
2069 std::move(command_buffer));
2070 }
2071 }
2072
2073 bool Canvas::EnsureFinalMipmapGeneration() const {
2074 if (!render_target_.GetRenderTargetTexture()->NeedsMipmapGeneration()) {
2075 return true;
2076 }
2077 std::shared_ptr<CommandBuffer> cmd_buffer =
2078 renderer_.GetContext()->CreateCommandBuffer();
2079 if (!cmd_buffer) {
2080 return false;
2081 }
2082 std::shared_ptr<BlitPass> blit_pass = cmd_buffer->CreateBlitPass();
2083 if (!blit_pass) {
2084 return false;
2085 }
2086 blit_pass->GenerateMipmap(render_target_.GetRenderTargetTexture());
2087 blit_pass->EncodeCommands();
2088 return renderer_.GetContext()->EnqueueCommandBuffer(std::move(cmd_buffer));
2089 }
2090
2091 void Canvas::EndReplay() {
2092 FML_DCHECK(render_passes_.size() == 1u);
2093 render_passes_.back().GetInlinePassContext()->GetRenderPass();
2094 render_passes_.back().GetInlinePassContext()->EndPass(
2095 /*is_onscreen=*/!requires_readback_ && is_onscreen_);
2096 backdrop_data_.clear();
2097
2098 // If requires_readback_ was true, then we rendered to an offscreen texture
2099 // instead of to the onscreen provided in the render target. Now we need to
2100 // draw or blit the offscreen back to the onscreen.
2101 if (requires_readback_) {
2102 BlitToOnscreen(/*is_onscreen_=*/is_onscreen_);
2103 }
2104 if (!EnsureFinalMipmapGeneration()) {
2105 VALIDATION_LOG << "Failed to generate onscreen mipmaps.";
2106 }
2107 if (!renderer_.GetContext()->FlushCommandBuffers()) {
2108 // Not much we can do.
2109 VALIDATION_LOG << "Failed to submit command buffers";
2110 }
2111 render_passes_.clear();
2112 renderer_.GetRenderTargetCache()->End();
2113 clip_geometry_.clear();
2114
2115 Reset();
2116 Initialize(initial_cull_rect_);
2117 }
2118
2119 LazyRenderingConfig::LazyRenderingConfig(
2120 ContentContext& renderer,
2121 std::unique_ptr<EntityPassTarget> p_entity_pass_target)
2122 : entity_pass_target_(std::move(p_entity_pass_target)) {
2123 inline_pass_context_ =
2124 std::make_unique<InlinePassContext>(renderer, *entity_pass_target_);
2125 }
2126
2127 bool LazyRenderingConfig::IsApplyingClearColor() const {
2128 return !inline_pass_context_->IsActive();
2129 }
2130
2131 EntityPassTarget* LazyRenderingConfig::GetEntityPassTarget() const {
2132 return entity_pass_target_.get();
2133 }
2134
2135 InlinePassContext* LazyRenderingConfig::GetInlinePassContext() const {
2136 return inline_pass_context_.get();
2137 }
2138
2139 } // namespace impeller
arc_geometry.h
atlas_contents.h
canvas.h
circle_geometry.h
impeller::ArcGeometry
Definition: arc_geometry.h:17
impeller::ArcStrokeGeometry
A Geometry that produces fillable vertices representing the stroked outline of an |Arc| object using ...
Definition: stroke_path_geometry.h:132
impeller::Canvas::ClipGeometry
void ClipGeometry(const Geometry &geometry, Entity::ClipOperation clip_op, bool is_aa=true)
Definition: canvas.cc:827
impeller::Canvas::kMaxDepth
static constexpr uint32_t kMaxDepth
Definition: canvas.h:120
impeller::Canvas::Canvas
Canvas(ContentContext &renderer, const RenderTarget &render_target, bool is_onscreen, bool requires_readback)
Definition: canvas.cc:198
impeller::Canvas::DrawRoundSuperellipse
void DrawRoundSuperellipse(const RoundSuperellipse &rse, const Paint &paint)
Definition: canvas.cc:782
impeller::Canvas::GetLocalCoverageLimit
std::optional< Rect > GetLocalCoverageLimit() const
Return the culling bounds of the current render target, or nullopt if there is no coverage.
Definition: canvas.cc:1203
impeller::Canvas::SaveLayer
void SaveLayer(const Paint &paint, std::optional< Rect > bounds=std::nullopt, const flutter::DlImageFilter *backdrop_filter=nullptr, ContentBoundsPromise bounds_promise=ContentBoundsPromise::kUnknown, uint32_t total_content_depth=kMaxDepth, bool can_distribute_opacity=false, std::optional< int64_t > backdrop_id=std::nullopt)
Definition: canvas.cc:1240
impeller::Canvas::GetCurrentTransform
const Matrix & GetCurrentTransform() const
Definition: canvas.cc:272
impeller::Canvas::DrawVertices
void DrawVertices(const std::shared_ptr< VerticesGeometry > &vertices, BlendMode blend_mode, const Paint &paint)
Definition: canvas.cc:1006
impeller::Canvas::DrawOval
void DrawOval(const Rect &rect, const Paint &paint)
Definition: canvas.cc:650
impeller::Canvas::DrawImageRect
void DrawImageRect(const std::shared_ptr< Texture > &image, Rect source, Rect dest, const Paint &paint, const SamplerDescriptor &sampler={}, SourceRectConstraint src_rect_constraint=SourceRectConstraint::kFast)
Definition: canvas.cc:941
impeller::Canvas::RestoreToCount
void RestoreToCount(size_t count)
Definition: canvas.cc:319
impeller::Canvas::Restore
bool Restore()
Definition: canvas.cc:1478
impeller::Canvas::GetSaveCount
size_t GetSaveCount() const
Definition: canvas.cc:311
impeller::Canvas::Concat
void Concat(const Matrix &transform)
Definition: canvas.cc:256
impeller::Canvas::Transform
void Transform(const Matrix &transform)
Definition: canvas.cc:268
impeller::Canvas::DrawDashedLine
void DrawDashedLine(const Point &p0, const Point &p1, Scalar on_length, Scalar off_length, const Paint &paint)
Definition: canvas.cc:606
impeller::Canvas::DrawDiffRoundRect
void DrawDiffRoundRect(const RoundRect &outer, const RoundRect &inner, const Paint &paint)
Definition: canvas.cc:766
impeller::Canvas::DrawPath
void DrawPath(const flutter::DlPath &path, const Paint &paint)
Definition: canvas.cc:327
impeller::Canvas::BackdropFilterProc
std::function< std::shared_ptr< FilterContents >(FilterInput::Ref, const Matrix &effect_transform, Entity::RenderingMode rendering_mode)> BackdropFilterProc
Definition: canvas.h:125
impeller::Canvas::PreConcat
void PreConcat(const Matrix &transform)
Definition: canvas.cc:260
impeller::Canvas::Rotate
void Rotate(Radians radians)
Definition: canvas.cc:292
impeller::Canvas::DrawPoints
void DrawPoints(const Point points[], uint32_t count, Scalar radius, const Paint &paint, PointStyle point_style)
Definition: canvas.cc:909
impeller::Canvas::ResetTransform
void ResetTransform()
Definition: canvas.cc:264
impeller::Canvas::DrawTextFrame
void DrawTextFrame(const std::shared_ptr< TextFrame > &text_frame, Point position, const Paint &paint)
Definition: canvas.cc:1669
impeller::Canvas::DrawImage
void DrawImage(const std::shared_ptr< Texture > &image, Point offset, const Paint &paint, const SamplerDescriptor &sampler={})
Definition: canvas.cc:927
impeller::Canvas::DrawPaint
void DrawPaint(const Paint &paint)
Definition: canvas.cc:341
impeller::Canvas::DrawRoundRect
void DrawRoundRect(const RoundRect &rect, const Paint &paint)
Definition: canvas.cc:734
impeller::Canvas::Skew
void Skew(Scalar sx, Scalar sy)
Definition: canvas.cc:288
impeller::Canvas::Scale
void Scale(const Vector2 &scale)
Definition: canvas.cc:280
impeller::Canvas::Save
void Save(uint32_t total_content_depth=kMaxDepth)
Definition: canvas.cc:1186
impeller::Canvas::DrawRect
void DrawRect(const Rect &rect, const Paint &paint)
Definition: canvas.cc:632
impeller::Canvas::DrawAtlas
void DrawAtlas(const std::shared_ptr< AtlasContents > &atlas_contents, const Paint &paint)
Definition: canvas.cc:1120
impeller::Canvas::DrawLine
void DrawLine(const Point &p0, const Point &p1, const Paint &paint, bool reuse_depth=false)
Definition: canvas.cc:584
impeller::Canvas::Translate
void Translate(const Vector3 &offset)
Definition: canvas.cc:276
impeller::Canvas::DrawCircle
void DrawCircle(const Point &center, Scalar radius, const Paint &paint)
Definition: canvas.cc:804
impeller::Canvas::DrawArc
void DrawArc(const Arc &arc, const Paint &paint)
Definition: canvas.cc:679
impeller::Capabilities::SupportsImplicitResolvingMSAA
virtual bool SupportsImplicitResolvingMSAA() const =0
Whether the context backend supports multisampled rendering to the on-screen surface without requirin...
impeller::Capabilities::SupportsFramebufferFetch
virtual bool SupportsFramebufferFetch() const =0
Whether the context backend is able to support pipelines with shaders that read from the framebuffer ...
impeller::Capabilities::SupportsReadFromResolve
virtual bool SupportsReadFromResolve() const =0
Whether the context backend supports binding the current RenderPass attachments. This is supported if...
impeller::CircleGeometry
Definition: circle_geometry.h:14
impeller::ClipContents
Definition: clip_contents.h:29
impeller::ClipContents::SetGeometry
void SetGeometry(GeometryResult geometry)
Set the pre-tessellated clip geometry.
Definition: clip_contents.cc:37
impeller::ClipContents::SetClipOperation
void SetClipOperation(Entity::ClipOperation clip_op)
Definition: clip_contents.cc:41
impeller::ClipContents::Render
bool Render(const ContentContext &renderer, RenderPass &pass, uint32_t clip_depth) const
Definition: clip_contents.cc:70
impeller::ColorFilterContents::AbsorbOpacity::kYes
@ kYes
impeller::ColorFilterContents::MakeBlend
static std::shared_ptr< ColorFilterContents > MakeBlend(BlendMode blend_mode, FilterInput::Vector inputs, std::optional< Color > foreground_color=std::nullopt)
the [inputs] are expected to be in the order of dst, src.
Definition: color_filter_contents.cc:17
impeller::ContentContext
Definition: content_context.h:138
impeller::ContentContext::GetDeviceCapabilities
const Capabilities & GetDeviceCapabilities() const
Definition: content_context.cc:954
impeller::ContentContext::GetRenderTargetCache
const std::shared_ptr< RenderTargetAllocator > & GetRenderTargetCache() const
Definition: content_context.h:269
impeller::ContentContext::GetTextShadowCache
TextShadowCache & GetTextShadowCache() const
Definition: content_context.h:315
impeller::ContentContext::GetContext
std::shared_ptr< Context > GetContext() const
Definition: content_context.cc:950
impeller::CoverGeometry
A geometry that implements "drawPaint" like behavior by covering the entire render pass area.
Definition: cover_geometry.h:14
impeller::EllipseGeometry
A Geometry class that can directly generate vertices (with or without texture coordinates) for filled...
Definition: ellipse_geometry.h:21
impeller::Entity
Definition: entity.h:26
impeller::Entity::SetTransform
void SetTransform(const Matrix &transform)
Set the global transform matrix for this Entity.
Definition: entity.cc:60
impeller::Entity::TileMode
TileMode
Definition: entity.h:48
impeller::Entity::GetCoverage
std::optional< Rect > GetCoverage() const
Definition: entity.cc:64
impeller::Entity::RenderingMode
RenderingMode
Definition: entity.h:33
impeller::Entity::RenderingMode::kDirect
@ kDirect
impeller::Entity::RenderingMode::kSubpassPrependSnapshotTransform
@ kSubpassPrependSnapshotTransform
impeller::Entity::RenderingMode::kSubpassAppendSnapshotTransform
@ kSubpassAppendSnapshotTransform
impeller::Entity::GetContents
const std::shared_ptr< Contents > & GetContents() const
Definition: entity.cc:76
impeller::Entity::SetClipDepth
void SetClipDepth(uint32_t clip_depth)
Definition: entity.cc:80
impeller::Entity::GetBlendMode
BlendMode GetBlendMode() const
Definition: entity.cc:101
impeller::Entity::SetContents
void SetContents(std::shared_ptr< Contents > contents)
Definition: entity.cc:72
impeller::Entity::SetBlendMode
void SetBlendMode(BlendMode blend_mode)
Definition: entity.cc:97
impeller::Entity::Render
bool Render(const ContentContext &renderer, RenderPass &parent_pass) const
Definition: entity.cc:144
impeller::Entity::GetTransform
const Matrix & GetTransform() const
Get the global transform matrix for this Entity.
Definition: entity.cc:44
impeller::Entity::kLastPipelineBlendMode
static constexpr BlendMode kLastPipelineBlendMode
Definition: entity.h:28
impeller::Entity::IsBlendModeDestructive
static bool IsBlendModeDestructive(BlendMode blend_mode)
Returns true if the blend mode is "destructive", meaning that even fully transparent source colors wo...
Definition: entity.cc:127
impeller::Entity::ClipOperation
ClipOperation
Definition: entity.h:67
impeller::Entity::ClipOperation::kIntersect
@ kIntersect
impeller::Entity::ClipOperation::kDifference
@ kDifference
impeller::EntityPassClipStack
A class that tracks all clips that have been recorded in the current entity pass stencil.
Definition: entity_pass_clip_stack.h:23
impeller::EntityPassClipStack::CurrentClipCoverage
std::optional< Rect > CurrentClipCoverage() const
Definition: entity_pass_clip_stack.cc:24
impeller::EntityPassClipStack::PushSubpass
void PushSubpass(std::optional< Rect > subpass_coverage, size_t clip_height)
Definition: entity_pass_clip_stack.cc:32
impeller::EntityPassClipStack::GetLastReplayResult
ReplayResult & GetLastReplayResult()
Definition: entity_pass_clip_stack.h:61
impeller::EntityPassClipStack::RecordClip
ClipStateResult RecordClip(const ClipContents &clip_contents, Matrix transform, Point global_pass_position, uint32_t clip_depth, size_t clip_height_floor, bool is_aa)
Definition: entity_pass_clip_stack.cc:100
impeller::EntityPassClipStack::RecordRestore
ClipStateResult RecordRestore(Point global_pass_position, size_t restore_height)
Definition: entity_pass_clip_stack.cc:54
impeller::EntityPassClipStack::PopSubpass
void PopSubpass()
Definition: entity_pass_clip_stack.cc:44
impeller::EntityPassClipStack::HasCoverage
bool HasCoverage() const
Definition: entity_pass_clip_stack.cc:28
impeller::EntityPassTarget
Definition: entity_pass_target.h:15
impeller::FillDiffRoundRectGeometry
A Geometry that produces fillable vertices for the gap between a pair of |RoundRect| objects using th...
Definition: fill_path_geometry.h:70
impeller::FillPathGeometry
A Geometry that produces fillable vertices from a |DlPath| object using the |FillPathSourceGeometry| ...
Definition: fill_path_geometry.h:55
impeller::FillRectGeometry
Definition: rect_geometry.h:13
impeller::FillRoundRectGeometry
A Geometry class that produces fillable vertices from any |RoundRect| object regardless of radii unif...
Definition: round_rect_geometry.h:59
impeller::FilterContents::BlurStyle::kNormal
@ kNormal
Blurred inside and outside.
impeller::FilterContents::BlurStyle::kOuter
@ kOuter
Nothing inside, blurred outside.
impeller::FilterContents::BlurStyle::kInner
@ kInner
Blurred inside, nothing outside.
impeller::FilterContents::BlurStyle::kSolid
@ kSolid
Solid inside, blurred outside.
impeller::FilterInput::Ref
std::shared_ptr< FilterInput > Ref
Definition: filter_input.h:32
impeller::FilterInput::Make
static FilterInput::Ref Make(Variant input, bool msaa_enabled=true)
Definition: filter_input.cc:19
impeller::FilterInput::Vector
std::vector< FilterInput::Ref > Vector
Definition: filter_input.h:33
impeller::Geometry
Definition: geometry.h:50
impeller::Geometry::MakeRect
static std::unique_ptr< Geometry > MakeRect(const Rect &rect)
Definition: geometry.cc:83
impeller::Geometry::GetPositionBuffer
virtual GeometryResult GetPositionBuffer(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const =0
impeller::Geometry::CanApplyMaskFilter
virtual bool CanApplyMaskFilter() const
Definition: geometry.cc:144
impeller::Geometry::GetCoverage
virtual std::optional< Rect > GetCoverage(const Matrix &transform) const =0
impeller::Geometry::IsAxisAlignedRect
virtual bool IsAxisAlignedRect() const
Definition: geometry.cc:140
impeller::InlinePassContext
Definition: inline_pass_context.h:17
impeller::InlinePassContext::EndPass
bool EndPass(bool is_onscreen=false)
Definition: inline_pass_context.cc:43
impeller::InlinePassContext::GetTexture
std::shared_ptr< Texture > GetTexture()
Definition: inline_pass_context.cc:36
impeller::InlinePassContext::IsValid
bool IsValid() const
Definition: inline_pass_context.cc:28
impeller::InlinePassContext::GetRenderPass
const std::shared_ptr< RenderPass > & GetRenderPass()
Definition: inline_pass_context.cc:78
impeller::LazyRenderingConfig
Definition: canvas.h:99
impeller::LazyRenderingConfig::IsApplyingClearColor
bool IsApplyingClearColor() const
Whether or not the clear color texture can still be updated.
Definition: canvas.cc:2127
impeller::LazyRenderingConfig::GetEntityPassTarget
EntityPassTarget * GetEntityPassTarget() const
Definition: canvas.cc:2131
impeller::LazyRenderingConfig::GetInlinePassContext
InlinePassContext * GetInlinePassContext() const
Definition: canvas.cc:2135
impeller::LineContents::Make
static std::unique_ptr< LineContents > Make(std::unique_ptr< LineGeometry > geometry, Color color)
Definition: line_contents.cc:137
impeller::PointFieldGeometry
A geometry class specialized for Canvas::DrawPoints.
Definition: point_field_geometry.h:16
impeller::RenderTarget
Definition: render_target.h:38
impeller::RenderTarget::GetColorAttachment
ColorAttachment GetColorAttachment(size_t index) const
Get the color attachment at [index].
Definition: render_target.cc:233
impeller::RenderTarget::SetColorAttachment
RenderTarget & SetColorAttachment(const ColorAttachment &attachment, size_t index)
Definition: render_target.cc:199
impeller::RenderTarget::GetRenderTargetSize
ISize GetRenderTargetSize() const
Definition: render_target.cc:171
impeller::RenderTarget::GetDepthAttachment
const std::optional< DepthAttachment > & GetDepthAttachment() const
Definition: render_target.cc:247
impeller::RenderTarget::GetStencilAttachment
const std::optional< StencilAttachment > & GetStencilAttachment() const
Definition: render_target.cc:251
impeller::RenderTarget::SetupDepthStencilAttachments
void SetupDepthStencilAttachments(const Context &context, Allocator &allocator, ISize size, bool msaa, std::string_view label="Offscreen", RenderTarget::AttachmentConfig stencil_attachment_config=RenderTarget::kDefaultStencilAttachmentConfig, const std::shared_ptr< Texture > &depth_stencil_texture=nullptr)
Definition: render_target.cc:475
impeller::RoundRectGeometry
A Geometry class that generates fillable vertices (with or without texture coordinates) directly from...
Definition: round_rect_geometry.h:25
impeller::RoundSuperellipseGeometry
A Geometry class that generates fillable vertices (with or without texture coordinates) directly from...
Definition: round_superellipse_geometry.h:30
impeller::StrokeDashedLineGeometry
A Geometry that produces fillable vertices representing the stroked outline of a |DlPath| object usin...
Definition: stroke_path_geometry.h:170
impeller::StrokeDiffRoundRectGeometry
A Geometry that produces fillable vertices representing the stroked outline of a pair of nested |Roun...
Definition: stroke_path_geometry.h:152
impeller::StrokeEllipseGeometry
A Geometry class that produces fillable vertices representing the stroked outline of an ellipse with ...
Definition: ellipse_geometry.h:54
impeller::StrokePathGeometry
A Geometry that produces fillable vertices representing the stroked outline of a |DlPath| object usin...
Definition: stroke_path_geometry.h:115
impeller::StrokeRectGeometry
Definition: rect_geometry.h:37
impeller::StrokeRoundRectGeometry
A Geometry class that produces fillable vertices representing the stroked outline of any |Roundrect| ...
Definition: round_rect_geometry.h:80
impeller::StrokeRoundSuperellipseGeometry
A Geometry class that produces fillable vertices representing the stroked outline of any |RoundSupere...
Definition: round_superellipse_geometry.h:69
impeller::TextShadowCache::Lookup
std::optional< Entity > Lookup(const ContentContext &renderer, const Entity &entity, const std::shared_ptr< FilterContents > &contents, const TextShadowCacheKey &)
Lookup the entity in the cache with the given filter/text contents, returning the new entity to rende...
Definition: text_shadow_cache.cc:41
impeller::TextureContents::MakeRect
static std::shared_ptr< TextureContents > MakeRect(Rect destination)
Definition: texture_contents.cc:28
clip_contents.h
color.h
color_source_contents.h
command_buffer.h
content_context.h
formats.h
cover_geometry.h
color_filter.h
image_filter.h
ellipse_geometry.h
fill_path_geometry.h
filter_contents.h
framebuffer_blend_contents.h
subpass_size
ISize subpass_size
The output size of the down-sampling pass.
Definition: gaussian_blur_filter_contents.cc:202
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214
constants.h
geometry.h
line_contents.h
line_geometry.h
impeller::skia_conversions::ToSamplerDescriptor
impeller::SamplerDescriptor ToSamplerDescriptor(const flutter::DlImageSampling options)
Definition: skia_conversions.cc:24
impeller::skia_conversions::ToColor
Color ToColor(const flutter::DlColor &color)
Definition: skia_conversions.cc:13
impeller
Definition: allocation.cc:12
impeller::kMaxTextScale
static constexpr Scalar kMaxTextScale
Definition: canvas.cc:1667
impeller::WrapWithGPUColorFilter
std::shared_ptr< ColorFilterContents > WrapWithGPUColorFilter(const flutter::DlColorFilter *filter, const std::shared_ptr< FilterInput > &input, ColorFilterContents::AbsorbOpacity absorb_opacity)
Definition: color_filter.cc:24
impeller::IRect32
TRect< int32_t > IRect32
Definition: rect.h:789
impeller::Scalar
float Scalar
Definition: scalar.h:19
impeller::SourceRectConstraint
SourceRectConstraint
Controls the behavior of the source rectangle given to DrawImageRect.
Definition: canvas.h:74
impeller::SourceRectConstraint::kStrict
@ kStrict
Sample only within the source rectangle. May be slower.
impeller::WrapInput
std::shared_ptr< FilterContents > WrapInput(const flutter::DlImageFilter *filter, const FilterInput::Ref &input)
Generate a new FilterContents using this filter's configuration.
Definition: image_filter.cc:18
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:57
impeller::WrapWithInvertColors
std::shared_ptr< ColorFilterContents > WrapWithInvertColors(const std::shared_ptr< FilterInput > &input, ColorFilterContents::AbsorbOpacity absorb_opacity)
Definition: color_filter.cc:16
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:788
impeller::PointStyle
PointStyle
Definition: canvas.h:65
impeller::PointStyle::kRound
@ kRound
Points are drawn as squares.
impeller::Point
TPoint< Scalar > Point
Definition: point.h:327
impeller::StorageMode::kDevicePrivate
@ kDevicePrivate
impeller::StorageMode::kDeviceTransient
@ kDeviceTransient
impeller::Cap::kRound
@ kRound
impeller::GetCPUColorFilterProc
ColorFilterProc GetCPUColorFilterProc(const flutter::DlColorFilter *filter)
Definition: color_filter.cc:66
impeller::DlPath
flutter::DlPath DlPath
Definition: dl_dispatcher.h:29
impeller::BlendMode
BlendMode
Definition: color.h:58
impeller::BlendMode::kDst
@ kDst
impeller::BlendMode::kSrcOver
@ kSrcOver
impeller::BlendMode::kSrc
@ kSrc
impeller::ContentBoundsPromise
ContentBoundsPromise
Definition: canvas.h:84
impeller::ContentBoundsPromise::kMayClipContents
@ kMayClipContents
The caller claims the bounds are a subset of an estimate of the reasonably tight bounds but likely cl...
impeller::ContentBoundsPromise::kContainsContents
@ kContainsContents
The caller claims the bounds are a reasonably tight estimate of the coverage of the contents and shou...
impeller::LoadAction::kDontCare
@ kDontCare
impeller::StoreAction::kDontCare
@ kDontCare
impeller::StoreAction::kMultisampleResolve
@ kMultisampleResolve
impeller::Size
TSize< Scalar > Size
Definition: size.h:159
impeller::kColorInversion
static constexpr const ColorMatrix kColorInversion
A color matrix which inverts colors.
Definition: color_filter.h:16
impeller::ComputeSaveLayerCoverage
std::optional< Rect > ComputeSaveLayerCoverage(const Rect &content_coverage, const Matrix &effect_transform, const Rect &coverage_limit, const std::shared_ptr< FilterContents > &image_filter, bool flood_output_coverage, bool flood_input_coverage)
Compute the coverage of a subpass in the global coordinate space.
Definition: save_layer_utils.cc:19
impeller::ISize
ISize64 ISize
Definition: size.h:162
std
Definition: comparable.h:95
point_field_geometry.h
rect_geometry.h
rstransform.h
save_layer_utils.h
skia_conversions.h
solid_rrect_blur_contents.h
solid_rsuperellipse_blur_contents.h
stroke_path_geometry.h
impeller::Arc
Definition: arc.h:13
impeller::Arc::IncludeCenter
constexpr bool IncludeCenter() const
Definition: arc.h:110
impeller::Arc::IsFullCircle
constexpr bool IsFullCircle() const
Definition: arc.h:114
impeller::Arc::GetOvalBounds
const Rect & GetOvalBounds() const
Return the bounds of the oval in which this arc is inscribed.
Definition: arc.h:94
impeller::Arc::GetSweep
constexpr Degrees GetSweep() const
Definition: arc.h:108
impeller::Arc::GetStart
constexpr Degrees GetStart() const
Definition: arc.h:106
impeller::Attachment::load_action
LoadAction load_action
Definition: formats.h:659
impeller::Attachment::texture
std::shared_ptr< Texture > texture
Definition: formats.h:657
impeller::BackdropData
Definition: canvas.h:40
impeller::BackdropData::all_filters_equal
bool all_filters_equal
Definition: canvas.h:42
impeller::BackdropData::texture_slot
std::shared_ptr< Texture > texture_slot
Definition: canvas.h:43
impeller::BackdropData::backdrop_count
size_t backdrop_count
Definition: canvas.h:41
impeller::BackdropData::shared_filter_snapshot
std::optional< Snapshot > shared_filter_snapshot
Definition: canvas.h:46
impeller::Canvas::SaveLayerState
Definition: canvas.h:263
impeller::Canvas::SaveLayerState::coverage
Rect coverage
Definition: canvas.h:265
impeller::Canvas::SaveLayerState::paint
Paint paint
Definition: canvas.h:264
impeller::CanvasStackEntry
Definition: canvas.h:50
impeller::CanvasStackEntry::clip_height
size_t clip_height
Definition: canvas.h:53
impeller::CanvasStackEntry::did_round_out
bool did_round_out
Definition: canvas.h:62
impeller::CanvasStackEntry::rendering_mode
Entity::RenderingMode rendering_mode
Definition: canvas.h:57
impeller::CanvasStackEntry::transform
Matrix transform
Definition: canvas.h:51
impeller::CanvasStackEntry::clip_depth
uint32_t clip_depth
Definition: canvas.h:52
impeller::ColorAttachment
Definition: formats.h:665
impeller::ColorAttachment::clear_color
Color clear_color
Definition: formats.h:666
impeller::Color::BlackTransparent
static constexpr Color BlackTransparent()
Definition: color.h:270
impeller::Color::Khaki
static constexpr Color Khaki()
Definition: color.h:518
impeller::Color::alpha
Scalar alpha
Definition: color.h:143
impeller::Color::White
static constexpr Color White()
Definition: color.h:264
impeller::Color::WithAlpha
constexpr Color WithAlpha(Scalar new_alpha) const
Definition: color.h:278
impeller::ColorMatrix
Definition: color.h:117
impeller::ColorMatrix::array
Scalar array[20]
Definition: color.h:118
impeller::EntityPassClipStack::ClipStateResult
Definition: entity_pass_clip_stack.h:32
impeller::EntityPassClipStack::ClipStateResult::clip_did_change
bool clip_did_change
Definition: entity_pass_clip_stack.h:38
impeller::EntityPassClipStack::ClipStateResult::should_render
bool should_render
Definition: entity_pass_clip_stack.h:35
impeller::EntityPassClipStack::ReplayResult::clip_contents
ClipContents clip_contents
Definition: entity_pass_clip_stack.h:26
impeller::GeometryResult
Definition: geometry.h:21
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::Matrix::MakeTranslation
static constexpr Matrix MakeTranslation(const Vector3 &t)
Definition: matrix.h:95
impeller::Matrix::Invert
Matrix Invert() const
Definition: matrix.cc:99
impeller::Matrix::MakeSkew
static constexpr Matrix MakeSkew(Scalar sx, Scalar sy)
Definition: matrix.h:127
impeller::Matrix::MakeTranslateScale
static constexpr Matrix MakeTranslateScale(const Vector3 &s, const Vector3 &t)
Definition: matrix.h:113
impeller::Matrix::MakeRotationZ
static Matrix MakeRotationZ(Radians r)
Definition: matrix.h:223
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:104
impeller::Matrix::GetMaxBasisLengthXY
Scalar GetMaxBasisLengthXY() const
Return the maximum scale applied specifically to either the X axis or Y axis unit vectors (the bases)...
Definition: matrix.h:328
impeller::Paint
Definition: paint.h:27
impeller::Paint::WithFilters
std::shared_ptr< Contents > WithFilters(std::shared_ptr< Contents > input) const
Wrap this paint's configured filters to the given contents.
Definition: paint.cc:278
impeller::Paint::color_filter
const flutter::DlColorFilter * color_filter
Definition: paint.h:77
impeller::Paint::color_source
const flutter::DlColorSource * color_source
Definition: paint.h:76
impeller::Paint::Style::kStroke
@ kStroke
impeller::Paint::Style::kFill
@ kFill
impeller::Paint::image_filter
const flutter::DlImageFilter * image_filter
Definition: paint.h:78
impeller::Paint::style
Style style
Definition: paint.h:81
impeller::Paint::invert_colors
bool invert_colors
Definition: paint.h:83
impeller::Paint::CanApplyOpacityPeephole
static bool CanApplyOpacityPeephole(const Paint &paint)
Whether or not a save layer with the provided paint can perform the opacity peephole optimization.
Definition: paint.h:40
impeller::Paint::mask_blur_descriptor
std::optional< MaskBlurDescriptor > mask_blur_descriptor
Definition: paint.h:85
impeller::Paint::color
Color color
Definition: paint.h:75
impeller::Paint::blend_mode
BlendMode blend_mode
Definition: paint.h:82
impeller::Paint::WithImageFilter
std::shared_ptr< FilterContents > WithImageFilter(const FilterInput::Variant &input, const Matrix &effect_transform, Entity::RenderingMode rendering_mode) const
Definition: paint.cc:312
impeller::Paint::stroke
StrokeParameters stroke
Definition: paint.h:80
impeller::Paint::CreateContents
std::shared_ptr< ColorSourceContents > CreateContents() const
Definition: paint.cc:62
impeller::Paint::HasColorFilter
bool HasColorFilter() const
Whether this paint has a color filter that can apply opacity.
Definition: paint.cc:469
impeller::Radians
Definition: scalar.h:44
impeller::RoundRect
Definition: round_rect.h:16
impeller::RoundRect::GetRadii
constexpr const RoundingRadii & GetRadii() const
Definition: round_rect.h:55
impeller::RoundRect::GetBounds
constexpr const Rect & GetBounds() const
Definition: round_rect.h:53
impeller::RoundSuperellipse
Definition: round_superellipse.h:18
impeller::RoundSuperellipse::GetRadii
constexpr const RoundingRadii & GetRadii() const
Definition: round_superellipse.h:50
impeller::RoundSuperellipse::GetBounds
constexpr const Rect & GetBounds() const
Definition: round_superellipse.h:49
impeller::SamplerDescriptor
Definition: sampler_descriptor.h:14
impeller::Snapshot
Represents a texture and its intended draw transform/sampler configuration.
Definition: snapshot.h:24
impeller::Snapshot::transform
Matrix transform
The transform that should be applied to this texture for rendering.
Definition: snapshot.h:27
impeller::Snapshot::texture
std::shared_ptr< Texture > texture
Definition: snapshot.h:25
impeller::Snapshot::sampler_descriptor
SamplerDescriptor sampler_descriptor
Definition: snapshot.h:29
impeller::StrokeParameters::cap
Cap cap
Definition: stroke_parameters.h:30
impeller::StrokeParameters::width
Scalar width
Definition: stroke_parameters.h:29
impeller::TPoint< Scalar >
impeller::TPoint::GetDistance
constexpr Type GetDistance(const TPoint &p) const
Definition: point.h:200
impeller::TRect< Scalar >
impeller::TRect::Expand
constexpr TRect< T > Expand(T left, T top, T right, T bottom) const
Returns a rectangle with expanded edges. Negative expansion results in shrinking.
Definition: rect.h:618
impeller::TRect::GetBottom
constexpr auto GetBottom() const
Definition: rect.h:357
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:472
impeller::TRect::GetTop
constexpr auto GetTop() const
Definition: rect.h:353
impeller::TRect::GetHeight
constexpr Type GetHeight() const
Returns the height of the rectangle, equivalent to |GetSize().height|.
Definition: rect.h:347
impeller::TRect::GetOrigin
constexpr TPoint< Type > GetOrigin() const
Returns the upper left corner of the rectangle as specified by the left/top or x/y values when it was...
Definition: rect.h:320
impeller::TRect::Intersection
constexpr std::optional< TRect > Intersection(const TRect &o) const
Definition: rect.h:528
impeller::TRect::IsEmpty
constexpr bool IsEmpty() const
Returns true if either of the width or height are 0, negative, or NaN.
Definition: rect.h:297
impeller::TRect< Scalar >::MakeOriginSize
constexpr static TRect MakeOriginSize(const TPoint< Type > &origin, const TSize< Type > &size)
Definition: rect.h:144
impeller::TRect::GetLeft
constexpr auto GetLeft() const
Definition: rect.h:351
impeller::TRect::GetSize
constexpr TSize< Type > GetSize() const
Returns the size of the rectangle which may be negative in either width or height and may have been c...
Definition: rect.h:327
impeller::TRect< Scalar >::Round
Round(const TRect< U > &r)
Definition: rect.h:695
impeller::TRect::RoundOut
RoundOut(const TRect< U > &r)
Definition: rect.h:679
impeller::TRect::GetRight
constexpr auto GetRight() const
Definition: rect.h:355
impeller::TRect::IsSquare
constexpr bool IsSquare() const
Returns true if width and height are equal and neither is NaN.
Definition: rect.h:304
impeller::TRect< Scalar >::MakeXYWH
constexpr static TRect MakeXYWH(Type x, Type y, Type width, Type height)
Definition: rect.h:136
impeller::TRect::Shift
constexpr TRect< T > Shift(T dx, T dy) const
Returns a new rectangle translated by the given offset.
Definition: rect.h:602
impeller::TRect::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150
impeller::TRect::GetWidth
constexpr Type GetWidth() const
Returns the width of the rectangle, equivalent to |GetSize().width|.
Definition: rect.h:341
impeller::TRect::GetCenter
constexpr Point GetCenter() const
Get the center point as a |Point|.
Definition: rect.h:382
impeller::TRect< Scalar >::MakeLTRB
constexpr static TRect MakeLTRB(Type left, Type top, Type right, Type bottom)
Definition: rect.h:129
impeller::TRect< Scalar >::MakeMaximum
constexpr static TRect MakeMaximum()
Definition: rect.h:188
impeller::TSize< Scalar >
impeller::TSize::IsEmpty
constexpr bool IsEmpty() const
Returns true if either of the width or height are 0, negative, or NaN.
Definition: size.h:123
impeller::Vector3
Definition: vector.h:20
points
std::vector< Point > points
Definition: tessellator_libtess.cc:76
text_contents.h
text_shadow_cache.h
texture_contents.h
validation.h
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:91
vertices_contents.h