| 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/dl_color_source.h"
13 #include "display_list/effects/dl_image_filter.h"
14 #include "flutter/fml/logging.h"
15 #include "flutter/fml/trace_event.h"
16 #include "impeller/base/validation.h"
17 #include "impeller/core/formats.h"
18 #include "impeller/display_list/color_filter.h"
19 #include "impeller/display_list/image_filter.h"
20 #include "impeller/display_list/skia_conversions.h"
21 #include "impeller/entity/contents/atlas_contents.h"
22 #include "impeller/entity/contents/clip_contents.h"
23 #include "impeller/entity/contents/color_source_contents.h"
24 #include "impeller/entity/contents/content_context.h"
25 #include "impeller/entity/contents/filters/filter_contents.h"
26 #include "impeller/entity/contents/framebuffer_blend_contents.h"
27 #include "impeller/entity/contents/solid_rrect_blur_contents.h"
28 #include "impeller/entity/contents/text_contents.h"
29 #include "impeller/entity/contents/texture_contents.h"
30 #include "impeller/entity/contents/vertices_contents.h"
31 #include "impeller/entity/geometry/circle_geometry.h"
32 #include "impeller/entity/geometry/cover_geometry.h"
33 #include "impeller/entity/geometry/ellipse_geometry.h"
34 #include "impeller/entity/geometry/fill_path_geometry.h"
35 #include "impeller/entity/geometry/geometry.h"
36 #include "impeller/entity/geometry/line_geometry.h"
37 #include "impeller/entity/geometry/point_field_geometry.h"
38 #include "impeller/entity/geometry/rect_geometry.h"
39 #include "impeller/entity/geometry/round_rect_geometry.h"
40 #include "impeller/entity/geometry/round_superellipse_geometry.h"
41 #include "impeller/entity/geometry/stroke_path_geometry.h"
42 #include "impeller/entity/save_layer_utils.h"
43 #include "impeller/geometry/color.h"
44 #include "impeller/geometry/constants.h"
45 #include "impeller/geometry/path_builder.h"
46 #include "impeller/renderer/command_buffer.h"
47
48 namespace impeller {
49
50 namespace {
51
52 static bool UseColorSourceContents(
53 const std::shared_ptr<VerticesGeometry>& vertices,
54 const Paint& paint) {
55 // If there are no vertex color or texture coordinates. Or if there
56 // are vertex coordinates but its just a color.
57 if (vertices->HasVertexColors()) {
58 return false;
59 }
60 if (vertices->HasTextureCoordinates() && !paint.color_source) {
61 return true;
62 }
63 return !vertices->HasTextureCoordinates();
64 }
65
66 static void SetClipScissor(std::optional<Rect> clip_coverage,
67 RenderPass& pass,
68 Point global_pass_position) {
69 // Set the scissor to the clip coverage area. We do this prior to rendering
70 // the clip itself and all its contents.
71 IRect scissor;
72 if (clip_coverage.has_value()) {
73 clip_coverage = clip_coverage->Shift(-global_pass_position);
74 scissor = IRect::RoundOut(clip_coverage.value());
75 // The scissor rect must not exceed the size of the render target.
76 scissor = scissor.Intersection(IRect::MakeSize(pass.GetRenderTargetSize()))
77 .value_or(IRect());
78 }
79 pass.SetScissor(scissor);
80 }
81
82 static void ApplyFramebufferBlend(Entity& entity) {
83 auto src_contents = entity.GetContents();
84 auto contents = std::make_shared<FramebufferBlendContents>();
85 contents->SetChildContents(src_contents);
86 contents->SetBlendMode(entity.GetBlendMode());
87 entity.SetContents(std::move(contents));
88 entity.SetBlendMode(BlendMode::kSource);
89 }
90
91 /// @brief Create the subpass restore contents, appling any filters or opacity
92 /// from the provided paint object.
93 static std::shared_ptr<Contents> CreateContentsForSubpassTarget(
94 const Paint& paint,
95 const std::shared_ptr<Texture>& target,
96 const Matrix& effect_transform) {
97 auto contents = TextureContents::MakeRect(Rect::MakeSize(target->GetSize()));
98 contents->SetTexture(target);
99 contents->SetLabel("Subpass");
100 contents->SetSourceRect(Rect::MakeSize(target->GetSize()));
101 contents->SetOpacity(paint.color.alpha);
102 contents->SetDeferApplyingOpacity(true);
103
104 return paint.WithFiltersForSubpassTarget(std::move(contents),
105 effect_transform);
106 }
107
108 static const constexpr RenderTarget::AttachmentConfig kDefaultStencilConfig =
109 RenderTarget::AttachmentConfig{
110 .storage_mode = StorageMode::kDeviceTransient,
111 .load_action = LoadAction::kDontCare,
112 .store_action = StoreAction::kDontCare,
113 };
114
115 static std::unique_ptr<EntityPassTarget> CreateRenderTarget(
116 ContentContext& renderer,
117 ISize size,
118 const Color& clear_color) {
119 const std::shared_ptr<Context>& context = renderer.GetContext();
120
121 /// All of the load/store actions are managed by `InlinePassContext` when
122 /// `RenderPasses` are created, so we just set them to `kDontCare` here.
123 /// What's important is the `StorageMode` of the textures, which cannot be
124 /// changed for the lifetime of the textures.
125
126 RenderTarget target;
127 if (context->GetCapabilities()->SupportsOffscreenMSAA()) {
128 target = renderer.GetRenderTargetCache()->CreateOffscreenMSAA(
129 /*context=*/*context,
130 /*size=*/size,
131 /*mip_count=*/1,
132 /*label=*/"EntityPass",
133 /*color_attachment_config=*/
134 RenderTarget::AttachmentConfigMSAA{
135 .storage_mode = StorageMode::kDeviceTransient,
136 .resolve_storage_mode = StorageMode::kDevicePrivate,
137 .load_action = LoadAction::kDontCare,
138 .store_action = StoreAction::kMultisampleResolve,
139 .clear_color = clear_color},
140 /*stencil_attachment_config=*/kDefaultStencilConfig);
141 } else {
142 target = renderer.GetRenderTargetCache()->CreateOffscreen(
143 *context, // context
144 size, // size
145 /*mip_count=*/1,
146 "EntityPass", // label
147 RenderTarget::AttachmentConfig{
148 .storage_mode = StorageMode::kDevicePrivate,
149 .load_action = LoadAction::kDontCare,
150 .store_action = StoreAction::kDontCare,
151 .clear_color = clear_color,
152 }, // color_attachment_config
153 kDefaultStencilConfig //
154 );
155 }
156
157 return std::make_unique<EntityPassTarget>(
158 target, renderer.GetDeviceCapabilities().SupportsReadFromResolve(),
159 renderer.GetDeviceCapabilities().SupportsImplicitResolvingMSAA());
160 }
161
162 } // namespace
163
164 Canvas::Canvas(ContentContext& renderer,
165 const RenderTarget& render_target,
166 bool is_onscreen,
167 bool requires_readback)
168 : renderer_(renderer),
169 render_target_(render_target),
170 is_onscreen_(is_onscreen),
171 requires_readback_(requires_readback),
172 clip_coverage_stack_(EntityPassClipStack(
173 Rect::MakeSize(render_target.GetRenderTargetSize()))) {
174 Initialize(std::nullopt);
175 SetupRenderPass();
176 }
177
178 Canvas::Canvas(ContentContext& renderer,
179 const RenderTarget& render_target,
180 bool is_onscreen,
181 bool requires_readback,
182 Rect cull_rect)
183 : renderer_(renderer),
184 render_target_(render_target),
185 is_onscreen_(is_onscreen),
186 requires_readback_(requires_readback),
187 clip_coverage_stack_(EntityPassClipStack(
188 Rect::MakeSize(render_target.GetRenderTargetSize()))) {
189 Initialize(cull_rect);
190 SetupRenderPass();
191 }
192
193 Canvas::Canvas(ContentContext& renderer,
194 const RenderTarget& render_target,
195 bool is_onscreen,
196 bool requires_readback,
197 IRect cull_rect)
198 : renderer_(renderer),
199 render_target_(render_target),
200 is_onscreen_(is_onscreen),
201 requires_readback_(requires_readback),
202 clip_coverage_stack_(EntityPassClipStack(
203 Rect::MakeSize(render_target.GetRenderTargetSize()))) {
204 Initialize(Rect::MakeLTRB(cull_rect.GetLeft(), cull_rect.GetTop(),
205 cull_rect.GetRight(), cull_rect.GetBottom()));
206 SetupRenderPass();
207 }
208
209 void Canvas::Initialize(std::optional<Rect> cull_rect) {
210 initial_cull_rect_ = cull_rect;
211 transform_stack_.emplace_back(CanvasStackEntry{
212 .clip_depth = kMaxDepth,
213 });
214 FML_DCHECK(GetSaveCount() == 1u);
215 }
216
217 void Canvas::Reset() {
218 current_depth_ = 0u;
219 transform_stack_ = {};
220 }
221
222 void Canvas::Concat(const Matrix& transform) {
223 transform_stack_.back().transform = GetCurrentTransform() * transform;
224 }
225
226 void Canvas::PreConcat(const Matrix& transform) {
227 transform_stack_.back().transform = transform * GetCurrentTransform();
228 }
229
230 void Canvas::ResetTransform() {
231 transform_stack_.back().transform = {};
232 }
233
234 void Canvas::Transform(const Matrix& transform) {
235 Concat(transform);
236 }
237
238 const Matrix& Canvas::GetCurrentTransform() const {
239 return transform_stack_.back().transform;
240 }
241
242 void Canvas::Translate(const Vector3& offset) {
243 Concat(Matrix::MakeTranslation(offset));
244 }
245
246 void Canvas::Scale(const Vector2& scale) {
247 Concat(Matrix::MakeScale(scale));
248 }
249
250 void Canvas::Scale(const Vector3& scale) {
251 Concat(Matrix::MakeScale(scale));
252 }
253
254 void Canvas::Skew(Scalar sx, Scalar sy) {
255 Concat(Matrix::MakeSkew(sx, sy));
256 }
257
258 void Canvas::Rotate(Radians radians) {
259 Concat(Matrix::MakeRotationZ(radians));
260 }
261
262 Point Canvas::GetGlobalPassPosition() const {
263 if (save_layer_state_.empty()) {
264 return Point(0, 0);
265 }
266 return save_layer_state_.back().coverage.GetOrigin();
267 }
268
269 // clip depth of the previous save or 0.
270 size_t Canvas::GetClipHeightFloor() const {
271 if (transform_stack_.size() > 1) {
272 return transform_stack_[transform_stack_.size() - 2].clip_height;
273 }
274 return 0;
275 }
276
277 size_t Canvas::GetSaveCount() const {
278 return transform_stack_.size();
279 }
280
281 bool Canvas::IsSkipping() const {
282 return transform_stack_.back().skipping;
283 }
284
285 void Canvas::RestoreToCount(size_t count) {
286 while (GetSaveCount() > count) {
287 if (!Restore()) {
288 return;
289 }
290 }
291 }
292
293 void Canvas::DrawPath(const Path& path, const Paint& paint) {
294 Entity entity;
295 entity.SetTransform(GetCurrentTransform());
296 entity.SetBlendMode(paint.blend_mode);
297
298 if (paint.style == Paint::Style::kFill) {
299 FillPathGeometry geom(path);
300 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
301 } else {
302 StrokePathGeometry geom(path, paint.stroke_width, paint.stroke_miter,
303 paint.stroke_cap, paint.stroke_join);
304 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
305 }
306 }
307
308 void Canvas::DrawPaint(const Paint& paint) {
309 Entity entity;
310 entity.SetTransform(GetCurrentTransform());
311 entity.SetBlendMode(paint.blend_mode);
312
313 CoverGeometry geom;
314 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
315 }
316
317 bool Canvas::AttemptDrawBlurredRRect(const Rect& rect,
318 Size corner_radii,
319 const Paint& paint) {
320 if (paint.style != Paint::Style::kFill) {
321 return false;
322 }
323
324 if (paint.color_source) {
325 return false;
326 }
327
328 if (!paint.mask_blur_descriptor.has_value()) {
329 return false;
330 }
331
332 // A blur sigma that is not positive enough should not result in a blur.
333 if (paint.mask_blur_descriptor->sigma.sigma <= kEhCloseEnough) {
334 return false;
335 }
336
337 // The current rrect blur math doesn't work on ovals.
338 if (fabsf(corner_radii.width - corner_radii.height) > kEhCloseEnough) {
339 return false;
340 }
341
342 // For symmetrically mask blurred solid RRects, absorb the mask blur and use
343 // a faster SDF approximation.
344 Color rrect_color = paint.color;
345 if (paint.invert_colors) {
346 rrect_color = rrect_color.ApplyColorMatrix(kColorInversion);
347 }
348 if (paint.color_filter) {
349 rrect_color = GetCPUColorFilterProc(paint.color_filter)(rrect_color);
350 }
351
352 Paint rrect_paint = {.mask_blur_descriptor = paint.mask_blur_descriptor};
353
354 // In some cases, we need to render the mask blur to a separate layer.
355 //
356 // 1. If the blur style is normal, we'll be drawing using one draw call and
357 // no clips. And so we can just wrap the RRect contents with the
358 // ImageFilter, which will get applied to the result as per usual.
359 //
360 // 2. If the blur style is solid, we combine the non-blurred RRect with the
361 // blurred RRect via two separate draw calls, and so we need to defer any
362 // fancy blending, translucency, or image filtering until after these two
363 // draws have been combined in a separate layer.
364 //
365 // 3. If the blur style is outer or inner, we apply the blur style via a
366 // clip. The ImageFilter needs to be applied to the mask blurred result.
367 // And so if there's an ImageFilter, we need to defer applying it until
368 // after the clipped RRect blur has been drawn to a separate texture.
369 // However, since there's only one draw call that produces color, we
370 // don't need to worry about the blend mode or translucency (unlike with
371 // BlurStyle::kSolid).
372 //
373 if ((paint.mask_blur_descriptor->style !=
374 FilterContents::BlurStyle::kNormal &&
375 paint.image_filter) ||
376 (paint.mask_blur_descriptor->style == FilterContents::BlurStyle::kSolid &&
377 (!rrect_color.IsOpaque() ||
378 paint.blend_mode != BlendMode::kSourceOver))) {
379 Rect render_bounds = rect;
380 if (paint.mask_blur_descriptor->style !=
381 FilterContents::BlurStyle::kInner) {
382 render_bounds =
383 render_bounds.Expand(paint.mask_blur_descriptor->sigma.sigma * 4.0);
384 }
385 // Defer the alpha, blend mode, and image filter to a separate layer.
386 SaveLayer(
387 Paint{
388 .color = Color::White().WithAlpha(rrect_color.alpha),
389 .image_filter = paint.image_filter,
390 .blend_mode = paint.blend_mode,
391 },
392 render_bounds, nullptr, ContentBoundsPromise::kContainsContents, 1u);
393 rrect_paint.color = rrect_color.WithAlpha(1);
394 } else {
395 rrect_paint.color = rrect_color;
396 rrect_paint.blend_mode = paint.blend_mode;
397 rrect_paint.image_filter = paint.image_filter;
398 Save(1u);
399 }
400
401 auto draw_blurred_rrect = [this, &rect, &corner_radii, &rrect_paint]() {
402 auto contents = std::make_shared<SolidRRectBlurContents>();
403
404 contents->SetColor(rrect_paint.color);
405 contents->SetSigma(rrect_paint.mask_blur_descriptor->sigma);
406 contents->SetRRect(rect, corner_radii);
407
408 Entity blurred_rrect_entity;
409 blurred_rrect_entity.SetTransform(GetCurrentTransform());
410 blurred_rrect_entity.SetBlendMode(rrect_paint.blend_mode);
411
412 rrect_paint.mask_blur_descriptor = std::nullopt;
413 blurred_rrect_entity.SetContents(
414 rrect_paint.WithFilters(std::move(contents)));
415 AddRenderEntityToCurrentPass(blurred_rrect_entity);
416 };
417
418 switch (rrect_paint.mask_blur_descriptor->style) {
419 case FilterContents::BlurStyle::kNormal: {
420 draw_blurred_rrect();
421 break;
422 }
423 case FilterContents::BlurStyle::kSolid: {
424 // First, draw the blurred RRect.
425 draw_blurred_rrect();
426 // Then, draw the non-blurred RRect on top.
427 Entity entity;
428 entity.SetTransform(GetCurrentTransform());
429 entity.SetBlendMode(rrect_paint.blend_mode);
430
431 RoundRectGeometry geom(rect, corner_radii);
432 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, rrect_paint,
433 /*reuse_depth=*/true);
434 break;
435 }
436 case FilterContents::BlurStyle::kOuter: {
437 RoundRectGeometry geom(rect, corner_radii);
438 ClipGeometry(geom, Entity::ClipOperation::kDifference);
439 draw_blurred_rrect();
440 break;
441 }
442 case FilterContents::BlurStyle::kInner: {
443 RoundRectGeometry geom(rect, corner_radii);
444 ClipGeometry(geom, Entity::ClipOperation::kIntersect);
445 draw_blurred_rrect();
446 break;
447 }
448 }
449
450 Restore();
451
452 return true;
453 }
454
455 void Canvas::DrawLine(const Point& p0,
456 const Point& p1,
457 const Paint& paint,
458 bool reuse_depth) {
459 Entity entity;
460 entity.SetTransform(GetCurrentTransform());
461 entity.SetBlendMode(paint.blend_mode);
462
463 LineGeometry geom(p0, p1, paint.stroke_width, paint.stroke_cap);
464 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint,
465 /*reuse_depth=*/reuse_depth);
466 }
467
468 void Canvas::DrawRect(const Rect& rect, const Paint& paint) {
469 if (paint.style == Paint::Style::kStroke) {
470 DrawPath(PathBuilder{}.AddRect(rect).TakePath(), paint);
471 return;
472 }
473
474 if (AttemptDrawBlurredRRect(rect, {}, paint)) {
475 return;
476 }
477
478 Entity entity;
479 entity.SetTransform(GetCurrentTransform());
480 entity.SetBlendMode(paint.blend_mode);
481
482 RectGeometry geom(rect);
483 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
484 }
485
486 void Canvas::DrawOval(const Rect& rect, const Paint& paint) {
487 // TODO(jonahwilliams): This additional condition avoids an assert in the
488 // stroke circle geometry generator. I need to verify the condition that this
489 // assert prevents.
490 if (rect.IsSquare() && (paint.style == Paint::Style::kFill ||
491 (paint.style == Paint::Style::kStroke &&
492 paint.stroke_width < rect.GetWidth()))) {
493 // Circles have slightly less overhead and can do stroking
494 DrawCircle(rect.GetCenter(), rect.GetWidth() * 0.5f, paint);
495 return;
496 }
497
498 if (paint.style == Paint::Style::kStroke) {
499 // No stroked ellipses yet
500 DrawPath(PathBuilder{}.AddOval(rect).TakePath(), paint);
501 return;
502 }
503
504 if (AttemptDrawBlurredRRect(rect, rect.GetSize() * 0.5f, paint)) {
505 return;
506 }
507
508 Entity entity;
509 entity.SetTransform(GetCurrentTransform());
510 entity.SetBlendMode(paint.blend_mode);
511
512 EllipseGeometry geom(rect);
513 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
514 }
515
516 void Canvas::DrawRoundRect(const RoundRect& round_rect, const Paint& paint) {
517 auto& rect = round_rect.GetBounds();
518 auto& radii = round_rect.GetRadii();
519 if (radii.AreAllCornersSame()) {
520 if (AttemptDrawBlurredRRect(rect, radii.top_left, paint)) {
521 return;
522 }
523
524 if (paint.style == Paint::Style::kFill) {
525 Entity entity;
526 entity.SetTransform(GetCurrentTransform());
527 entity.SetBlendMode(paint.blend_mode);
528
529 RoundRectGeometry geom(rect, radii.top_left);
530 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
531 return;
532 }
533 }
534
535 auto path = PathBuilder{}
536 .SetConvexity(Convexity::kConvex)
537 .AddRoundRect(round_rect)
538 .SetBounds(rect)
539 .TakePath();
540 DrawPath(path, paint);
541 }
542
543 void Canvas::DrawCircle(const Point& center,
544 Scalar radius,
545 const Paint& paint) {
546 Size half_size(radius, radius);
547 if (AttemptDrawBlurredRRect(
548 Rect::MakeOriginSize(center - half_size, half_size * 2),
549 {radius, radius}, paint)) {
550 return;
551 }
552
553 Entity entity;
554 entity.SetTransform(GetCurrentTransform());
555 entity.SetBlendMode(paint.blend_mode);
556
557 if (paint.style == Paint::Style::kStroke) {
558 CircleGeometry geom(center, radius, paint.stroke_width);
559 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
560 } else {
561 CircleGeometry geom(center, radius);
562 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
563 }
564 }
565
566 void Canvas::ClipGeometry(const Geometry& geometry,
567 Entity::ClipOperation clip_op,
568 bool is_aa) {
569 if (IsSkipping()) {
570 return;
571 }
572
573 // Ideally the clip depth would be greater than the current rendering
574 // depth because any rendering calls that follow this clip operation will
575 // pre-increment the depth and then be rendering above our clip depth,
576 // but that case will be caught by the CHECK in AddRenderEntity above.
577 // In practice we sometimes have a clip set with no rendering after it
578 // and in such cases the current depth will equal the clip depth.
579 // Eventually the DisplayList should optimize these out, but it is hard
580 // to know if a clip will actually be used in advance of storing it in
581 // the DisplayList buffer.
582 // See https://github.com/flutter/flutter/issues/147021
583 FML_DCHECK(current_depth_ <= transform_stack_.back().clip_depth)
584 << current_depth_ << " <=? " << transform_stack_.back().clip_depth;
585 uint32_t clip_depth = transform_stack_.back().clip_depth;
586
587 const Matrix clip_transform =
588 Matrix::MakeTranslation(Vector3(-GetGlobalPassPosition())) *
589 GetCurrentTransform();
590
591 std::optional<Rect> clip_coverage = geometry.GetCoverage(clip_transform);
592 if (!clip_coverage.has_value()) {
593 return;
594 }
595
596 ClipContents clip_contents(
597 clip_coverage.value(),
598 /*is_axis_aligned_rect=*/geometry.IsAxisAlignedRect() &&
599 GetCurrentTransform().IsTranslationScaleOnly());
600 clip_contents.SetClipOperation(clip_op);
601
602 EntityPassClipStack::ClipStateResult clip_state_result =
603 clip_coverage_stack_.RecordClip(
604 clip_contents, //
605 /*transform=*/clip_transform, //
606 /*global_pass_position=*/GetGlobalPassPosition(), //
607 /*clip_depth=*/clip_depth, //
608 /*clip_height_floor=*/GetClipHeightFloor(), //
609 /*is_aa=*/is_aa);
610
611 if (clip_state_result.clip_did_change) {
612 // We only need to update the pass scissor if the clip state has changed.
613 SetClipScissor(clip_coverage_stack_.CurrentClipCoverage(),
614 *render_passes_.back().inline_pass_context->GetRenderPass(),
615 GetGlobalPassPosition());
616 }
617
618 ++transform_stack_.back().clip_height;
619 ++transform_stack_.back().num_clips;
620
621 if (!clip_state_result.should_render) {
622 return;
623 }
624
625 // Note: this is a bit of a hack. Its not possible to construct a geometry
626 // result without begninning the render pass. We should refactor the geometry
627 // objects so that they only need a reference to the render pass size and/or
628 // orthographic transform.
629 Entity entity;
630 entity.SetTransform(clip_transform);
631 entity.SetClipDepth(clip_depth);
632
633 GeometryResult geometry_result = geometry.GetPositionBuffer(
634 renderer_, //
635 entity, //
636 *render_passes_.back().inline_pass_context->GetRenderPass() //
637 );
638 clip_contents.SetGeometry(geometry_result);
639 clip_coverage_stack_.GetLastReplayResult().clip_contents.SetGeometry(
640 geometry_result);
641
642 clip_contents.Render(
643 renderer_, *render_passes_.back().inline_pass_context->GetRenderPass(),
644 clip_depth);
645 }
646
647 void Canvas::DrawPoints(const Point points[],
648 uint32_t count,
649 Scalar radius,
650 const Paint& paint,
651 PointStyle point_style) {
652 if (radius <= 0) {
653 return;
654 }
655
656 Entity entity;
657 entity.SetTransform(GetCurrentTransform());
658 entity.SetBlendMode(paint.blend_mode);
659
660 PointFieldGeometry geom(points, count, radius,
661 /*round=*/point_style == PointStyle::kRound);
662 AddRenderEntityWithFiltersToCurrentPass(entity, &geom, paint);
663 }
664
665 void Canvas::DrawImage(const std::shared_ptr<Texture>& image,
666 Point offset,
667 const Paint& paint,
668 const SamplerDescriptor& sampler) {
669 if (!image) {
670 return;
671 }
672
673 const auto source = Rect::MakeSize(image->GetSize());
674 const auto dest = source.Shift(offset);
675
676 DrawImageRect(image, source, dest, paint, sampler);
677 }
678
679 void Canvas::DrawImageRect(const std::shared_ptr<Texture>& image,
680 Rect source,
681 Rect dest,
682 const Paint& paint,
683 const SamplerDescriptor& sampler,
684 SourceRectConstraint src_rect_constraint) {
685 if (!image || source.IsEmpty() || dest.IsEmpty()) {
686 return;
687 }
688
689 auto size = image->GetSize();
690
691 if (size.IsEmpty()) {
692 return;
693 }
694
695 std::optional<Rect> clipped_source =
696 source.Intersection(Rect::MakeSize(size));
697 if (!clipped_source) {
698 return;
699 }
700 if (*clipped_source != source) {
701 Scalar sx = dest.GetWidth() / source.GetWidth();
702 Scalar sy = dest.GetHeight() / source.GetHeight();
703 Scalar tx = dest.GetLeft() - source.GetLeft() * sx;
704 Scalar ty = dest.GetTop() - source.GetTop() * sy;
705 Matrix src_to_dest = Matrix::MakeTranslateScale({sx, sy, 1}, {tx, ty, 0});
706 dest = clipped_source->TransformBounds(src_to_dest);
707 }
708
709 auto texture_contents = TextureContents::MakeRect(dest);
710 texture_contents->SetTexture(image);
711 texture_contents->SetSourceRect(*clipped_source);
712 texture_contents->SetStrictSourceRect(src_rect_constraint ==
713 SourceRectConstraint::kStrict);
714 texture_contents->SetSamplerDescriptor(sampler);
715 texture_contents->SetOpacity(paint.color.alpha);
716 texture_contents->SetDeferApplyingOpacity(paint.HasColorFilter());
717
718 Entity entity;
719 entity.SetBlendMode(paint.blend_mode);
720 entity.SetTransform(GetCurrentTransform());
721
722 if (!paint.mask_blur_descriptor.has_value()) {
723 entity.SetContents(paint.WithFilters(std::move(texture_contents)));
724 AddRenderEntityToCurrentPass(entity);
725 return;
726 }
727
728 RectGeometry out_rect(Rect{});
729
730 entity.SetContents(paint.WithFilters(
731 paint.mask_blur_descriptor->CreateMaskBlur(texture_contents, &out_rect)));
732 AddRenderEntityToCurrentPass(entity);
733 }
734
735 size_t Canvas::GetClipHeight() const {
736 return transform_stack_.back().clip_height;
737 }
738
739 void Canvas::DrawVertices(const std::shared_ptr<VerticesGeometry>& vertices,
740 BlendMode blend_mode,
741 const Paint& paint) {
742 // Override the blend mode with kDestination in order to match the behavior
743 // of Skia's SK_LEGACY_IGNORE_DRAW_VERTICES_BLEND_WITH_NO_SHADER flag, which
744 // is enabled when the Flutter engine builds Skia.
745 if (!paint.color_source) {
746 blend_mode = BlendMode::kDestination;
747 }
748
749 Entity entity;
750 entity.SetTransform(GetCurrentTransform());
751 entity.SetBlendMode(paint.blend_mode);
752
753 // If there are no vertex colors.
754 if (UseColorSourceContents(vertices, paint)) {
755 AddRenderEntityWithFiltersToCurrentPass(entity, vertices.get(), paint);
756 return;
757 }
758
759 // If the blend mode is destination don't bother to bind or create a texture.
760 if (blend_mode == BlendMode::kDestination) {
761 auto contents = std::make_shared<VerticesSimpleBlendContents>();
762 contents->SetBlendMode(blend_mode);
763 contents->SetAlpha(paint.color.alpha);
764 contents->SetGeometry(vertices);
765 entity.SetContents(paint.WithFilters(std::move(contents)));
766 AddRenderEntityToCurrentPass(entity);
767 return;
768 }
769
770 // If there is a texture, use this directly. Otherwise render the color
771 // source to a texture.
772 if (paint.color_source &&
773 paint.color_source->type() == flutter::DlColorSourceType::kImage) {
774 const flutter::DlImageColorSource* image_color_source =
775 paint.color_source->asImage();
776 FML_DCHECK(image_color_source &&
777 image_color_source->image()->impeller_texture());
778 auto texture = image_color_source->image()->impeller_texture();
779 auto x_tile_mode = static_cast<Entity::TileMode>(
780 image_color_source->horizontal_tile_mode());
781 auto y_tile_mode =
782 static_cast<Entity::TileMode>(image_color_source->vertical_tile_mode());
783 auto sampler_descriptor =
784 skia_conversions::ToSamplerDescriptor(image_color_source->sampling());
785 auto effect_transform = image_color_source->matrix();
786
787 auto contents = std::make_shared<VerticesSimpleBlendContents>();
788 contents->SetBlendMode(blend_mode);
789 contents->SetAlpha(paint.color.alpha);
790 contents->SetGeometry(vertices);
791 contents->SetEffectTransform(effect_transform);
792 contents->SetTexture(texture);
793 contents->SetTileMode(x_tile_mode, y_tile_mode);
794 contents->SetSamplerDescriptor(sampler_descriptor);
795
796 entity.SetContents(paint.WithFilters(std::move(contents)));
797 AddRenderEntityToCurrentPass(entity);
798 return;
799 }
800
801 auto src_paint = paint;
802 src_paint.color = paint.color.WithAlpha(1.0);
803
804 std::shared_ptr<ColorSourceContents> src_contents =
805 src_paint.CreateContents();
806 src_contents->SetGeometry(vertices.get());
807
808 // If the color source has an intrinsic size, then we use that to
809 // create the src contents as a simplification. Otherwise we use
810 // the extent of the texture coordinates to determine how large
811 // the src contents should be. If neither has a value we fall back
812 // to using the geometry coverage data.
813 Rect src_coverage;
814 auto size = src_contents->GetColorSourceSize();
815 if (size.has_value()) {
816 src_coverage = Rect::MakeXYWH(0, 0, size->width, size->height);
817 } else {
818 auto cvg = vertices->GetCoverage(Matrix{});
819 FML_CHECK(cvg.has_value());
820 auto texture_coverage = vertices->GetTextureCoordinateCoverge();
821 if (texture_coverage.has_value()) {
822 src_coverage =
823 Rect::MakeOriginSize(texture_coverage->GetOrigin(),
824 texture_coverage->GetSize().Max({1, 1}));
825 } else {
826 src_coverage = cvg.value();
827 }
828 }
829 src_contents = src_paint.CreateContents();
830
831 clip_geometry_.push_back(Geometry::MakeRect(Rect::Round(src_coverage)));
832 src_contents->SetGeometry(clip_geometry_.back().get());
833
834 auto contents = std::make_shared<VerticesSimpleBlendContents>();
835 contents->SetBlendMode(blend_mode);
836 contents->SetAlpha(paint.color.alpha);
837 contents->SetGeometry(vertices);
838 contents->SetLazyTextureCoverage(src_coverage);
839 contents->SetLazyTexture([src_contents,
840 src_coverage](const ContentContext& renderer) {
841 // Applying the src coverage as the coverage limit prevents the 1px
842 // coverage pad from adding a border that is picked up by developer
843 // specified UVs.
844 auto snapshot =
845 src_contents->RenderToSnapshot(renderer, {}, Rect::Round(src_coverage));
846 return snapshot.has_value() ? snapshot->texture : nullptr;
847 });
848 entity.SetContents(paint.WithFilters(std::move(contents)));
849 AddRenderEntityToCurrentPass(entity);
850 }
851
852 void Canvas::DrawAtlas(const std::shared_ptr<AtlasContents>& atlas_contents,
853 const Paint& paint) {
854 atlas_contents->SetAlpha(paint.color.alpha);
855
856 Entity entity;
857 entity.SetTransform(GetCurrentTransform());
858 entity.SetBlendMode(paint.blend_mode);
859 entity.SetContents(paint.WithFilters(atlas_contents));
860
861 AddRenderEntityToCurrentPass(entity);
862 }
863
864 /// Compositor Functionality
865 /////////////////////////////////////////
866
867 void Canvas::SetupRenderPass() {
868 renderer_.GetRenderTargetCache()->Start();
869 ColorAttachment color0 = render_target_.GetColorAttachment(0);
870
871 auto& stencil_attachment = render_target_.GetStencilAttachment();
872 auto& depth_attachment = render_target_.GetDepthAttachment();
873 if (!stencil_attachment.has_value() || !depth_attachment.has_value()) {
874 // Setup a new root stencil with an optimal configuration if one wasn't
875 // provided by the caller.
876 render_target_.SetupDepthStencilAttachments(
877 *renderer_.GetContext(),
878 *renderer_.GetContext()->GetResourceAllocator(),
879 color0.texture->GetSize(),
880 renderer_.GetContext()->GetCapabilities()->SupportsOffscreenMSAA(),
881 "ImpellerOnscreen", kDefaultStencilConfig);
882 }
883
884 // Set up the clear color of the root pass.
885 color0.clear_color = Color::BlackTransparent();
886 render_target_.SetColorAttachment(color0, 0);
887
888 // If requires_readback is true, then there is a backdrop filter or emulated
889 // advanced blend in the first save layer. This requires a readback, which
890 // isn't supported by onscreen textures. To support this, we immediately begin
891 // a second save layer with the same dimensions as the onscreen. When
892 // rendering is completed, we must blit this saveLayer to the onscreen.
893 if (requires_readback_) {
894 auto entity_pass_target =
895 CreateRenderTarget(renderer_, //
896 color0.texture->GetSize(), //
897 /*clear_color=*/Color::BlackTransparent());
898 render_passes_.push_back(
899 LazyRenderingConfig(renderer_, std::move(entity_pass_target)));
900 } else {
901 auto entity_pass_target = std::make_unique<EntityPassTarget>(
902 render_target_, //
903 renderer_.GetDeviceCapabilities().SupportsReadFromResolve(), //
904 renderer_.GetDeviceCapabilities().SupportsImplicitResolvingMSAA() //
905 );
906 render_passes_.push_back(
907 LazyRenderingConfig(renderer_, std::move(entity_pass_target)));
908 }
909 }
910
911 void Canvas::SkipUntilMatchingRestore(size_t total_content_depth) {
912 auto entry = CanvasStackEntry{};
913 entry.skipping = true;
914 entry.clip_depth = current_depth_ + total_content_depth;
915 transform_stack_.push_back(entry);
916 }
917
918 void Canvas::Save(uint32_t total_content_depth) {
919 if (IsSkipping()) {
920 return SkipUntilMatchingRestore(total_content_depth);
921 }
922
923 auto entry = CanvasStackEntry{};
924 entry.transform = transform_stack_.back().transform;
925 entry.clip_depth = current_depth_ + total_content_depth;
926 entry.distributed_opacity = transform_stack_.back().distributed_opacity;
927 FML_DCHECK(entry.clip_depth <= transform_stack_.back().clip_depth)
928 << entry.clip_depth << " <=? " << transform_stack_.back().clip_depth
929 << " after allocating " << total_content_depth;
930 entry.clip_height = transform_stack_.back().clip_height;
931 entry.rendering_mode = Entity::RenderingMode::kDirect;
932 transform_stack_.push_back(entry);
933 }
934
935 std::optional<Rect> Canvas::GetLocalCoverageLimit() const {
936 if (!clip_coverage_stack_.HasCoverage()) {
937 // The current clip is empty. This means the pass texture won't be
938 // visible, so skip it.
939 return std::nullopt;
940 }
941
942 auto maybe_current_clip_coverage = clip_coverage_stack_.CurrentClipCoverage();
943 if (!maybe_current_clip_coverage.has_value()) {
944 return std::nullopt;
945 }
946
947 auto current_clip_coverage = maybe_current_clip_coverage.value();
948
949 // The maximum coverage of the subpass. Subpasses textures should never
950 // extend outside the parent pass texture or the current clip coverage.
951 std::optional<Rect> maybe_coverage_limit =
952 Rect::MakeOriginSize(GetGlobalPassPosition(),
953 Size(render_passes_.back()
954 .inline_pass_context->GetTexture()
955 ->GetSize()))
956 .Intersection(current_clip_coverage);
957
958 if (!maybe_coverage_limit.has_value() || maybe_coverage_limit->IsEmpty()) {
959 return std::nullopt;
960 }
961
962 return maybe_coverage_limit->Intersection(
963 Rect::MakeSize(render_target_.GetRenderTargetSize()));
964 }
965
966 void Canvas::SaveLayer(const Paint& paint,
967 std::optional<Rect> bounds,
968 const flutter::DlImageFilter* backdrop_filter,
969 ContentBoundsPromise bounds_promise,
970 uint32_t total_content_depth,
971 bool can_distribute_opacity,
972 std::optional<int64_t> backdrop_id) {
973 TRACE_EVENT0("flutter", "Canvas::saveLayer");
974 if (IsSkipping()) {
975 return SkipUntilMatchingRestore(total_content_depth);
976 }
977
978 auto maybe_coverage_limit = GetLocalCoverageLimit();
979 if (!maybe_coverage_limit.has_value()) {
980 return SkipUntilMatchingRestore(total_content_depth);
981 }
982 auto coverage_limit = maybe_coverage_limit.value();
983
984 if (can_distribute_opacity && !backdrop_filter &&
985 Paint::CanApplyOpacityPeephole(paint) &&
986 bounds_promise != ContentBoundsPromise::kMayClipContents) {
987 Save(total_content_depth);
988 transform_stack_.back().distributed_opacity *= paint.color.alpha;
989 return;
990 }
991
992 std::shared_ptr<FilterContents> filter_contents = paint.WithImageFilter(
993 Rect(), transform_stack_.back().transform,
994 Entity::RenderingMode::kSubpassPrependSnapshotTransform);
995
996 std::optional<Rect> maybe_subpass_coverage = ComputeSaveLayerCoverage(
997 bounds.value_or(Rect::MakeMaximum()),
998 transform_stack_.back().transform, //
999 coverage_limit, //
1000 filter_contents, //
1001 /*flood_output_coverage=*/
1002 Entity::IsBlendModeDestructive(paint.blend_mode), //
1003 /*flood_input_coverage=*/!!backdrop_filter ||
1004 (paint.color_filter &&
1005 paint.color_filter->modifies_transparent_black()) //
1006 );
1007
1008 if (!maybe_subpass_coverage.has_value()) {
1009 return SkipUntilMatchingRestore(total_content_depth);
1010 }
1011
1012 auto subpass_coverage = maybe_subpass_coverage.value();
1013
1014 // When an image filter is present, clamp to avoid flicking due to nearest
1015 // sampled image. For other cases, round out to ensure than any geometry is
1016 // not cut off.
1017 //
1018 // See also this bug: https://github.com/flutter/flutter/issues/144213
1019 //
1020 // TODO(jonahwilliams): this could still round out for filters that use decal
1021 // sampling mode.
1022 ISize subpass_size;
1023 bool did_round_out = false;
1024 Point coverage_origin_adjustment = Point{0, 0};
1025 if (paint.image_filter) {
1026 subpass_size = ISize(subpass_coverage.GetSize());
1027 } else {
1028 did_round_out = true;
1029 subpass_size =
1030 static_cast<ISize>(IRect::RoundOut(subpass_coverage).GetSize());
1031 // If rounding out, adjust the coverage to account for the subpixel shift.
1032 coverage_origin_adjustment =
1033 Point(subpass_coverage.GetLeftTop().x -
1034 std::floor(subpass_coverage.GetLeftTop().x),
1035 subpass_coverage.GetLeftTop().y -
1036 std::floor(subpass_coverage.GetLeftTop().y));
1037 }
1038 if (subpass_size.IsEmpty()) {
1039 return SkipUntilMatchingRestore(total_content_depth);
1040 }
1041
1042 // When there are scaling filters present, these contents may exceed the
1043 // maximum texture size. Perform a clamp here, which may cause rendering
1044 // artifacts.
1045 subpass_size = subpass_size.Min(renderer_.GetContext()
1046 ->GetCapabilities()
1047 ->GetMaximumRenderPassAttachmentSize());
1048
1049 // Backdrop filter state, ignored if there is no BDF.
1050 std::shared_ptr<FilterContents> backdrop_filter_contents;
1051 Point local_position = Point(0, 0);
1052 if (backdrop_filter) {
1053 local_position = subpass_coverage.GetOrigin() - GetGlobalPassPosition();
1054 Canvas::BackdropFilterProc backdrop_filter_proc =
1055 [backdrop_filter = backdrop_filter](
1056 const FilterInput::Ref& input, const Matrix& effect_transform,
1057 Entity::RenderingMode rendering_mode) {
1058 auto filter = WrapInput(backdrop_filter, input);
1059 filter->SetEffectTransform(effect_transform);
1060 filter->SetRenderingMode(rendering_mode);
1061 return filter;
1062 };
1063
1064 std::shared_ptr<Texture> input_texture;
1065
1066 // If the backdrop ID is not nullopt and there is more than one usage
1067 // of it in the current scene, cache the backdrop texture and remove it from
1068 // the current entity pass flip.
1069 bool will_cache_backdrop_texture = false;
1070 BackdropData* backdrop_data = nullptr;
1071 // If we've reached this point, there is at least one backdrop filter. But
1072 // potentially more if there is a backdrop id. We may conditionally set this
1073 // to a higher value in the if block below.
1074 size_t backdrop_count = 1;
1075 if (backdrop_id.has_value()) {
1076 std::unordered_map<int64_t, BackdropData>::iterator backdrop_data_it =
1077 backdrop_data_.find(backdrop_id.value());
1078 if (backdrop_data_it != backdrop_data_.end()) {
1079 backdrop_data = &backdrop_data_it->second;
1080 will_cache_backdrop_texture =
1081 backdrop_data_it->second.backdrop_count > 1;
1082 backdrop_count = backdrop_data_it->second.backdrop_count;
1083 }
1084 }
1085
1086 if (!will_cache_backdrop_texture || !backdrop_data->texture_slot) {
1087 backdrop_count_ -= backdrop_count;
1088
1089 // The onscreen texture can be flipped to if:
1090 // 1. The device supports framebuffer fetch
1091 // 2. There are no more backdrop filters
1092 // 3. The current render pass is for the onscreen pass.
1093 const bool should_use_onscreen =
1094 renderer_.GetDeviceCapabilities().SupportsFramebufferFetch() &&
1095 backdrop_count_ == 0 && render_passes_.size() == 1u;
1096 input_texture = FlipBackdrop(
1097 GetGlobalPassPosition(), //
1098 /*should_remove_texture=*/will_cache_backdrop_texture, //
1099 /*should_use_onscreen=*/should_use_onscreen //
1100 );
1101 if (!input_texture) {
1102 // Validation failures are logged in FlipBackdrop.
1103 return;
1104 }
1105
1106 if (will_cache_backdrop_texture) {
1107 backdrop_data->texture_slot = input_texture;
1108 }
1109 } else {
1110 input_texture = backdrop_data->texture_slot;
1111 }
1112
1113 backdrop_filter_contents = backdrop_filter_proc(
1114 FilterInput::Make(std::move(input_texture)),
1115 transform_stack_.back().transform.Basis(),
1116 // When the subpass has a translation that means the math with
1117 // the snapshot has to be different.
1118 transform_stack_.back().transform.HasTranslation()
1119 ? Entity::RenderingMode::kSubpassPrependSnapshotTransform
1120 : Entity::RenderingMode::kSubpassAppendSnapshotTransform);
1121
1122 if (will_cache_backdrop_texture) {
1123 FML_DCHECK(backdrop_data);
1124 // If all filters on the shared backdrop layer are equal, process the
1125 // layer once.
1126 if (backdrop_data->all_filters_equal &&
1127 !backdrop_data->shared_filter_snapshot.has_value()) {
1128 // TODO(157110): compute minimum input hint.
1129 backdrop_data->shared_filter_snapshot =
1130 backdrop_filter_contents->RenderToSnapshot(renderer_, {});
1131 }
1132
1133 std::optional<Snapshot> maybe_snapshot =
1134 backdrop_data->shared_filter_snapshot;
1135 if (maybe_snapshot.has_value()) {
1136 Snapshot snapshot = maybe_snapshot.value();
1137 std::shared_ptr<TextureContents> contents = TextureContents::MakeRect(
1138 subpass_coverage.Shift(-GetGlobalPassPosition()));
1139 auto scaled =
1140 subpass_coverage.TransformBounds(snapshot.transform.Invert());
1141 contents->SetTexture(snapshot.texture);
1142 contents->SetSourceRect(scaled);
1143 contents->SetSamplerDescriptor(snapshot.sampler_descriptor);
1144
1145 // This backdrop entity sets a depth value as it is written to the newly
1146 // flipped backdrop and not into a new saveLayer.
1147 Entity backdrop_entity;
1148 backdrop_entity.SetContents(std::move(contents));
1149 backdrop_entity.SetClipDepth(++current_depth_);
1150 backdrop_entity.SetBlendMode(paint.blend_mode);
1151
1152 backdrop_entity.Render(renderer_, GetCurrentRenderPass());
1153 Save(0);
1154 return;
1155 }
1156 }
1157 }
1158
1159 // When applying a save layer, absorb any pending distributed opacity.
1160 Paint paint_copy = paint;
1161 paint_copy.color.alpha *= transform_stack_.back().distributed_opacity;
1162 transform_stack_.back().distributed_opacity = 1.0;
1163
1164 render_passes_.push_back(
1165 LazyRenderingConfig(renderer_, //
1166 CreateRenderTarget(renderer_, //
1167 subpass_size, //
1168 Color::BlackTransparent() //
1169 )));
1170 save_layer_state_.push_back(SaveLayerState{
1171 paint_copy, subpass_coverage.Shift(-coverage_origin_adjustment)});
1172
1173 CanvasStackEntry entry;
1174 entry.transform = transform_stack_.back().transform;
1175 entry.clip_depth = current_depth_ + total_content_depth;
1176 FML_DCHECK(entry.clip_depth <= transform_stack_.back().clip_depth)
1177 << entry.clip_depth << " <=? " << transform_stack_.back().clip_depth
1178 << " after allocating " << total_content_depth;
1179 entry.clip_height = transform_stack_.back().clip_height;
1180 entry.rendering_mode = Entity::RenderingMode::kSubpassAppendSnapshotTransform;
1181 entry.did_round_out = did_round_out;
1182 transform_stack_.emplace_back(entry);
1183
1184 // Start non-collapsed subpasses with a fresh clip coverage stack limited by
1185 // the subpass coverage. This is important because image filters applied to
1186 // save layers may transform the subpass texture after it's rendered,
1187 // causing parent clip coverage to get misaligned with the actual area that
1188 // the subpass will affect in the parent pass.
1189 clip_coverage_stack_.PushSubpass(subpass_coverage, GetClipHeight());
1190
1191 if (!backdrop_filter_contents) {
1192 return;
1193 }
1194
1195 // Render the backdrop entity.
1196 Entity backdrop_entity;
1197 backdrop_entity.SetContents(std::move(backdrop_filter_contents));
1198 backdrop_entity.SetTransform(
1199 Matrix::MakeTranslation(Vector3(-local_position)));
1200 backdrop_entity.SetClipDepth(std::numeric_limits<uint32_t>::max());
1201 backdrop_entity.Render(renderer_, GetCurrentRenderPass());
1202 }
1203
1204 bool Canvas::Restore() {
1205 FML_DCHECK(transform_stack_.size() > 0);
1206 if (transform_stack_.size() == 1) {
1207 return false;
1208 }
1209
1210 // This check is important to make sure we didn't exceed the depth
1211 // that the clips were rendered at while rendering any of the
1212 // rendering ops. It is OK for the current depth to equal the
1213 // outgoing clip depth because that means the clipping would have
1214 // been successful up through the last rendering op, but it cannot
1215 // be greater.
1216 // Also, we bump the current rendering depth to the outgoing clip
1217 // depth so that future rendering operations are not clipped by
1218 // any of the pixels set by the expiring clips. It is OK for the
1219 // estimates used to determine the clip depth in save/saveLayer
1220 // to be overly conservative, but we need to jump the depth to
1221 // the clip depth so that the next rendering op will get a
1222 // larger depth (it will pre-increment the current_depth_ value).
1223 FML_DCHECK(current_depth_ <= transform_stack_.back().clip_depth)
1224 << current_depth_ << " <=? " << transform_stack_.back().clip_depth;
1225 current_depth_ = transform_stack_.back().clip_depth;
1226
1227 if (IsSkipping()) {
1228 transform_stack_.pop_back();
1229 return true;
1230 }
1231
1232 if (transform_stack_.back().rendering_mode ==
1233 Entity::RenderingMode::kSubpassAppendSnapshotTransform ||
1234 transform_stack_.back().rendering_mode ==
1235 Entity::RenderingMode::kSubpassPrependSnapshotTransform) {
1236 auto lazy_render_pass = std::move(render_passes_.back());
1237 render_passes_.pop_back();
1238 // Force the render pass to be constructed if it never was.
1239 lazy_render_pass.inline_pass_context->GetRenderPass();
1240
1241 SaveLayerState save_layer_state = save_layer_state_.back();
1242 save_layer_state_.pop_back();
1243 auto global_pass_position = GetGlobalPassPosition();
1244
1245 std::shared_ptr<Contents> contents = CreateContentsForSubpassTarget(
1246 save_layer_state.paint, //
1247 lazy_render_pass.inline_pass_context->GetTexture(), //
1248 Matrix::MakeTranslation(Vector3{-global_pass_position}) * //
1249 transform_stack_.back().transform //
1250 );
1251
1252 lazy_render_pass.inline_pass_context->EndPass();
1253
1254 // Round the subpass texture position for pixel alignment with the parent
1255 // pass render target. By default, we draw subpass textures with nearest
1256 // sampling, so aligning here is important for avoiding visual nearest
1257 // sampling errors caused by limited floating point precision when
1258 // straddling a half pixel boundary.
1259 Point subpass_texture_position;
1260 if (transform_stack_.back().did_round_out) {
1261 // Subpass coverage was rounded out, origin potentially moved "down" by
1262 // as much as a pixel.
1263 subpass_texture_position =
1264 (save_layer_state.coverage.GetOrigin() - global_pass_position)
1265 .Floor();
1266 } else {
1267 // Subpass coverage was truncated. Pick the closest phyiscal pixel.
1268 subpass_texture_position =
1269 (save_layer_state.coverage.GetOrigin() - global_pass_position)
1270 .Round();
1271 }
1272
1273 Entity element_entity;
1274 element_entity.SetClipDepth(++current_depth_);
1275 element_entity.SetContents(std::move(contents));
1276 element_entity.SetBlendMode(save_layer_state.paint.blend_mode);
1277 element_entity.SetTransform(
1278 Matrix::MakeTranslation(Vector3(subpass_texture_position)));
1279
1280 if (element_entity.GetBlendMode() > Entity::kLastPipelineBlendMode) {
1281 if (renderer_.GetDeviceCapabilities().SupportsFramebufferFetch()) {
1282 ApplyFramebufferBlend(element_entity);
1283 } else {
1284 // End the active pass and flush the buffer before rendering "advanced"
1285 // blends. Advanced blends work by binding the current render target
1286 // texture as an input ("destination"), blending with a second texture
1287 // input ("source"), writing the result to an intermediate texture, and
1288 // finally copying the data from the intermediate texture back to the
1289 // render target texture. And so all of the commands that have written
1290 // to the render target texture so far need to execute before it's bound
1291 // for blending (otherwise the blend pass will end up executing before
1292 // all the previous commands in the active pass).
1293 auto input_texture = FlipBackdrop(GetGlobalPassPosition());
1294 if (!input_texture) {
1295 return false;
1296 }
1297
1298 FilterInput::Vector inputs = {
1299 FilterInput::Make(input_texture,
1300 element_entity.GetTransform().Invert()),
1301 FilterInput::Make(element_entity.GetContents())};
1302 auto contents = ColorFilterContents::MakeBlend(
1303 element_entity.GetBlendMode(), inputs);
1304 contents->SetCoverageHint(element_entity.GetCoverage());
1305 element_entity.SetContents(std::move(contents));
1306 element_entity.SetBlendMode(BlendMode::kSource);
1307 }
1308 }
1309
1310 element_entity.Render(
1311 renderer_, //
1312 *render_passes_.back().inline_pass_context->GetRenderPass() //
1313 );
1314 clip_coverage_stack_.PopSubpass();
1315 transform_stack_.pop_back();
1316
1317 // We don't need to restore clips if a saveLayer was performed, as the clip
1318 // state is per render target, and no more rendering operations will be
1319 // performed as the render target workloaded is completed in the restore.
1320 return true;
1321 }
1322
1323 size_t num_clips = transform_stack_.back().num_clips;
1324 transform_stack_.pop_back();
1325
1326 if (num_clips > 0) {
1327 EntityPassClipStack::ClipStateResult clip_state_result =
1328 clip_coverage_stack_.RecordRestore(GetGlobalPassPosition(),
1329 GetClipHeight());
1330
1331 // Clip restores are never required with depth based clipping.
1332 FML_DCHECK(!clip_state_result.should_render);
1333 if (clip_state_result.clip_did_change) {
1334 // We only need to update the pass scissor if the clip state has changed.
1335 SetClipScissor(
1336 clip_coverage_stack_.CurrentClipCoverage(), //
1337 *render_passes_.back().inline_pass_context->GetRenderPass(), //
1338 GetGlobalPassPosition() //
1339 );
1340 }
1341 }
1342
1343 return true;
1344 }
1345
1346 void Canvas::DrawTextFrame(const std::shared_ptr<TextFrame>& text_frame,
1347 Point position,
1348 const Paint& paint) {
1349 Entity entity;
1350 entity.SetClipDepth(GetClipHeight());
1351 entity.SetBlendMode(paint.blend_mode);
1352
1353 auto text_contents = std::make_shared<TextContents>();
1354 text_contents->SetTextFrame(text_frame);
1355 text_contents->SetForceTextColor(paint.mask_blur_descriptor.has_value());
1356 text_contents->SetScale(GetCurrentTransform().GetMaxBasisLengthXY());
1357 text_contents->SetColor(paint.color);
1358 text_contents->SetOffset(position);
1359 text_contents->SetTextProperties(paint.color, //
1360 paint.style == Paint::Style::kStroke, //
1361 paint.stroke_width, //
1362 paint.stroke_cap, //
1363 paint.stroke_join, //
1364 paint.stroke_miter //
1365 );
1366
1367 entity.SetTransform(GetCurrentTransform() *
1368 Matrix::MakeTranslation(position));
1369
1370 // TODO(bdero): This mask blur application is a hack. It will always wind up
1371 // doing a gaussian blur that affects the color source itself
1372 // instead of just the mask. The color filter text support
1373 // needs to be reworked in order to interact correctly with
1374 // mask filters.
1375 // https://github.com/flutter/flutter/issues/133297
1376 entity.SetContents(paint.WithFilters(paint.WithMaskBlur(
1377 std::move(text_contents), true, GetCurrentTransform())));
1378
1379 AddRenderEntityToCurrentPass(entity, false);
1380 }
1381
1382 void Canvas::AddRenderEntityWithFiltersToCurrentPass(Entity& entity,
1383 const Geometry* geometry,
1384 const Paint& paint,
1385 bool reuse_depth) {
1386 std::shared_ptr<ColorSourceContents> contents = paint.CreateContents();
1387 if (!paint.color_filter && !paint.invert_colors && !paint.image_filter &&
1388 !paint.mask_blur_descriptor.has_value()) {
1389 contents->SetGeometry(geometry);
1390 entity.SetContents(std::move(contents));
1391 AddRenderEntityToCurrentPass(entity, reuse_depth);
1392 return;
1393 }
1394
1395 // Attempt to apply the color filter on the CPU first.
1396 // Note: This is not just an optimization; some color sources rely on
1397 // CPU-applied color filters to behave properly.
1398 bool needs_color_filter = paint.color_filter || paint.invert_colors;
1399 if (needs_color_filter &&
1400 contents->ApplyColorFilter([&](Color color) -> Color {
1401 if (paint.color_filter) {
1402 color = GetCPUColorFilterProc(paint.color_filter)(color);
1403 }
1404 if (paint.invert_colors) {
1405 color = color.ApplyColorMatrix(kColorInversion);
1406 }
1407 return color;
1408 })) {
1409 needs_color_filter = false;
1410 }
1411
1412 bool can_apply_mask_filter = geometry->CanApplyMaskFilter();
1413 contents->SetGeometry(geometry);
1414
1415 if (can_apply_mask_filter && paint.mask_blur_descriptor.has_value()) {
1416 // If there's a mask blur and we need to apply the color filter on the GPU,
1417 // we need to be careful to only apply the color filter to the source
1418 // colors. CreateMaskBlur is able to handle this case.
1419 RectGeometry out_rect(Rect{});
1420 auto filter_contents = paint.mask_blur_descriptor->CreateMaskBlur(
1421 contents, needs_color_filter ? paint.color_filter : nullptr,
1422 needs_color_filter ? paint.invert_colors : false, &out_rect);
1423 entity.SetContents(std::move(filter_contents));
1424 AddRenderEntityToCurrentPass(entity, reuse_depth);
1425 return;
1426 }
1427
1428 std::shared_ptr<Contents> contents_copy = std::move(contents);
1429
1430 // Image input types will directly set their color filter,
1431 // if any. See `TiledTextureContents.SetColorFilter`.
1432 if (needs_color_filter &&
1433 (!paint.color_source ||
1434 paint.color_source->type() != flutter::DlColorSourceType::kImage)) {
1435 if (paint.color_filter) {
1436 contents_copy = WrapWithGPUColorFilter(
1437 paint.color_filter, FilterInput::Make(std::move(contents_copy)),
1438 ColorFilterContents::AbsorbOpacity::kYes);
1439 }
1440 if (paint.invert_colors) {
1441 contents_copy =
1442 WrapWithInvertColors(FilterInput::Make(std::move(contents_copy)),
1443 ColorFilterContents::AbsorbOpacity::kYes);
1444 }
1445 }
1446
1447 if (paint.image_filter) {
1448 std::shared_ptr<FilterContents> filter = WrapInput(
1449 paint.image_filter, FilterInput::Make(std::move(contents_copy)));
1450 filter->SetRenderingMode(Entity::RenderingMode::kDirect);
1451 entity.SetContents(filter);
1452 AddRenderEntityToCurrentPass(entity, reuse_depth);
1453 return;
1454 }
1455
1456 entity.SetContents(std::move(contents_copy));
1457 AddRenderEntityToCurrentPass(entity, reuse_depth);
1458 }
1459
1460 void Canvas::AddRenderEntityToCurrentPass(Entity& entity, bool reuse_depth) {
1461 if (IsSkipping()) {
1462 return;
1463 }
1464
1465 entity.SetTransform(
1466 Matrix::MakeTranslation(Vector3(-GetGlobalPassPosition())) *
1467 entity.GetTransform());
1468 entity.SetInheritedOpacity(transform_stack_.back().distributed_opacity);
1469 if (entity.GetBlendMode() == BlendMode::kSourceOver &&
1470 entity.GetContents()->IsOpaque(entity.GetTransform())) {
1471 entity.SetBlendMode(BlendMode::kSource);
1472 }
1473
1474 // If the entity covers the current render target and is a solid color, then
1475 // conditionally update the backdrop color to its solid color value blended
1476 // with the current backdrop.
1477 if (render_passes_.back().IsApplyingClearColor()) {
1478 std::optional<Color> maybe_color = entity.AsBackgroundColor(
1479 render_passes_.back().inline_pass_context->GetTexture()->GetSize());
1480 if (maybe_color.has_value()) {
1481 Color color = maybe_color.value();
1482 RenderTarget& render_target = render_passes_.back()
1483 .inline_pass_context->GetPassTarget()
1484 .GetRenderTarget();
1485 ColorAttachment attachment = render_target.GetColorAttachment(0);
1486 // Attachment.clear color needs to be premultiplied at all times, but the
1487 // Color::Blend function requires unpremultiplied colors.
1488 attachment.clear_color = attachment.clear_color.Unpremultiply()
1489 .Blend(color, entity.GetBlendMode())
1490 .Premultiply();
1491 render_target.SetColorAttachment(attachment, 0u);
1492 return;
1493 }
1494 }
1495
1496 if (!reuse_depth) {
1497 ++current_depth_;
1498 }
1499 // We can render at a depth up to and including the depth of the currently
1500 // active clips and we will still be clipped out, but we cannot render at
1501 // a depth that is greater than the current clips or we will not be clipped.
1502 FML_DCHECK(current_depth_ <= transform_stack_.back().clip_depth)
1503 << current_depth_ << " <=? " << transform_stack_.back().clip_depth;
1504 entity.SetClipDepth(current_depth_);
1505
1506 if (entity.GetBlendMode() > Entity::kLastPipelineBlendMode) {
1507 if (renderer_.GetDeviceCapabilities().SupportsFramebufferFetch()) {
1508 ApplyFramebufferBlend(entity);
1509 } else {
1510 // End the active pass and flush the buffer before rendering "advanced"
1511 // blends. Advanced blends work by binding the current render target
1512 // texture as an input ("destination"), blending with a second texture
1513 // input ("source"), writing the result to an intermediate texture, and
1514 // finally copying the data from the intermediate texture back to the
1515 // render target texture. And so all of the commands that have written
1516 // to the render target texture so far need to execute before it's bound
1517 // for blending (otherwise the blend pass will end up executing before
1518 // all the previous commands in the active pass).
1519 auto input_texture = FlipBackdrop(GetGlobalPassPosition());
1520 if (!input_texture) {
1521 return;
1522 }
1523
1524 // The coverage hint tells the rendered Contents which portion of the
1525 // rendered output will actually be used, and so we set this to the
1526 // current clip coverage (which is the max clip bounds). The contents may
1527 // optionally use this hint to avoid unnecessary rendering work.
1528 auto element_coverage_hint = entity.GetContents()->GetCoverageHint();
1529 entity.GetContents()->SetCoverageHint(Rect::Intersection(
1530 element_coverage_hint, clip_coverage_stack_.CurrentClipCoverage()));
1531
1532 FilterInput::Vector inputs = {
1533 FilterInput::Make(input_texture, entity.GetTransform().Invert()),
1534 FilterInput::Make(entity.GetContents())};
1535 auto contents =
1536 ColorFilterContents::MakeBlend(entity.GetBlendMode(), inputs);
1537 entity.SetContents(std::move(contents));
1538 entity.SetBlendMode(BlendMode::kSource);
1539 }
1540 }
1541
1542 const std::shared_ptr<RenderPass>& result =
1543 render_passes_.back().inline_pass_context->GetRenderPass();
1544 if (!result) {
1545 // Failure to produce a render pass should be explained by specific errors
1546 // in `InlinePassContext::GetRenderPass()`, so avoid log spam and don't
1547 // append a validation log here.
1548 return;
1549 }
1550
1551 entity.Render(renderer_, *result);
1552 }
1553
1554 RenderPass& Canvas::GetCurrentRenderPass() const {
1555 return *render_passes_.back().inline_pass_context->GetRenderPass();
1556 }
1557
1558 void Canvas::SetBackdropData(
1559 std::unordered_map<int64_t, BackdropData> backdrop_data,
1560 size_t backdrop_count) {
1561 backdrop_data_ = std::move(backdrop_data);
1562 backdrop_count_ = backdrop_count;
1563 }
1564
1565 std::shared_ptr<Texture> Canvas::FlipBackdrop(Point global_pass_position,
1566 bool should_remove_texture,
1567 bool should_use_onscreen) {
1568 LazyRenderingConfig rendering_config = std::move(render_passes_.back());
1569 render_passes_.pop_back();
1570
1571 // If the very first thing we render in this EntityPass is a subpass that
1572 // happens to have a backdrop filter or advanced blend, than that backdrop
1573 // filter/blend will sample from an uninitialized texture.
1574 //
1575 // By calling `pass_context.GetRenderPass` here, we force the texture to pass
1576 // through at least one RenderPass with the correct clear configuration before
1577 // any sampling occurs.
1578 //
1579 // In cases where there are no contents, we
1580 // could instead check the clear color and initialize a 1x2 CPU texture
1581 // instead of ending the pass.
1582 rendering_config.inline_pass_context->GetRenderPass();
1583 if (!rendering_config.inline_pass_context->EndPass()) {
1584 VALIDATION_LOG
1585 << "Failed to end the current render pass in order to read from "
1586 "the backdrop texture and apply an advanced blend or backdrop "
1587 "filter.";
1588 // Note: adding this render pass ensures there are no later crashes from
1589 // unbalanced save layers. Ideally, this method would return false and the
1590 // renderer could handle that by terminating dispatch.
1591 render_passes_.push_back(LazyRenderingConfig(
1592 renderer_, std::move(rendering_config.entity_pass_target),
1593 std::move(rendering_config.inline_pass_context)));
1594 return nullptr;
1595 }
1596
1597 const std::shared_ptr<Texture>& input_texture =
1598 rendering_config.inline_pass_context->GetTexture();
1599
1600 if (!input_texture) {
1601 VALIDATION_LOG << "Failed to fetch the color texture in order to "
1602 "apply an advanced blend or backdrop filter.";
1603
1604 // Note: see above.
1605 render_passes_.push_back(LazyRenderingConfig(
1606 renderer_, std::move(rendering_config.entity_pass_target),
1607 std::move(rendering_config.inline_pass_context)));
1608 return nullptr;
1609 }
1610
1611 if (should_use_onscreen) {
1612 ColorAttachment color0 = render_target_.GetColorAttachment(0);
1613 // When MSAA is being used, we end up overriding the entire backdrop by
1614 // drawing the previous pass texture, and so we don't have to clear it and
1615 // can use kDontCare.
1616 color0.load_action = color0.resolve_texture != nullptr
1617 ? LoadAction::kDontCare
1618 : LoadAction::kLoad;
1619 render_target_.SetColorAttachment(color0, 0);
1620
1621 auto entity_pass_target = std::make_unique<EntityPassTarget>(
1622 render_target_, //
1623 renderer_.GetDeviceCapabilities().SupportsReadFromResolve(), //
1624 renderer_.GetDeviceCapabilities().SupportsImplicitResolvingMSAA() //
1625 );
1626 render_passes_.push_back(
1627 LazyRenderingConfig(renderer_, std::move(entity_pass_target)));
1628 requires_readback_ = false;
1629 } else {
1630 render_passes_.push_back(LazyRenderingConfig(
1631 renderer_, std::move(rendering_config.entity_pass_target),
1632 std::move(rendering_config.inline_pass_context)));
1633 // If the current texture is being cached for a BDF we need to ensure we
1634 // don't recycle it during recording; remove it from the entity pass target.
1635 if (should_remove_texture) {
1636 render_passes_.back().entity_pass_target->RemoveSecondary();
1637 }
1638 }
1639 RenderPass& current_render_pass =
1640 *render_passes_.back().inline_pass_context->GetRenderPass();
1641
1642 // Eagerly restore the BDF contents.
1643
1644 // If the pass context returns a backdrop texture, we need to draw it to the
1645 // current pass. We do this because it's faster and takes significantly less
1646 // memory than storing/loading large MSAA textures. Also, it's not possible
1647 // to blit the non-MSAA resolve texture of the previous pass to MSAA
1648 // textures (let alone a transient one).
1649 Rect size_rect = Rect::MakeSize(input_texture->GetSize());
1650 auto msaa_backdrop_contents = TextureContents::MakeRect(size_rect);
1651 msaa_backdrop_contents->SetStencilEnabled(false);
1652 msaa_backdrop_contents->SetLabel("MSAA backdrop");
1653 msaa_backdrop_contents->SetSourceRect(size_rect);
1654 msaa_backdrop_contents->SetTexture(input_texture);
1655
1656 Entity msaa_backdrop_entity;
1657 msaa_backdrop_entity.SetContents(std::move(msaa_backdrop_contents));
1658 msaa_backdrop_entity.SetBlendMode(BlendMode::kSource);
1659 msaa_backdrop_entity.SetClipDepth(std::numeric_limits<uint32_t>::max());
1660 if (!msaa_backdrop_entity.Render(renderer_, current_render_pass)) {
1661 VALIDATION_LOG << "Failed to render MSAA backdrop entity.";
1662 return nullptr;
1663 }
1664
1665 // Restore any clips that were recorded before the backdrop filter was
1666 // applied.
1667 auto& replay_entities = clip_coverage_stack_.GetReplayEntities();
1668 for (const auto& replay : replay_entities) {
1669 if (replay.clip_depth <= current_depth_) {
1670 continue;
1671 }
1672
1673 SetClipScissor(replay.clip_coverage, current_render_pass,
1674 global_pass_position);
1675 if (!replay.clip_contents.Render(renderer_, current_render_pass,
1676 replay.clip_depth)) {
1677 VALIDATION_LOG << "Failed to render entity for clip restore.";
1678 }
1679 }
1680
1681 return input_texture;
1682 }
1683
1684 bool Canvas::SupportsBlitToOnscreen() const {
1685 return renderer_.GetContext()
1686 ->GetCapabilities()
1687 ->SupportsTextureToTextureBlits() &&
1688 renderer_.GetContext()->GetBackendType() !=
1689 Context::BackendType::kOpenGLES;
1690 }
1691
1692 bool Canvas::BlitToOnscreen(bool is_onscreen) {
1693 auto command_buffer = renderer_.GetContext()->CreateCommandBuffer();
1694 command_buffer->SetLabel("EntityPass Root Command Buffer");
1695 auto offscreen_target = render_passes_.back()
1696 .inline_pass_context->GetPassTarget()
1697 .GetRenderTarget();
1698 if (SupportsBlitToOnscreen()) {
1699 auto blit_pass = command_buffer->CreateBlitPass();
1700 blit_pass->AddCopy(offscreen_target.GetRenderTargetTexture(),
1701 render_target_.GetRenderTargetTexture());
1702 if (!blit_pass->EncodeCommands()) {
1703 VALIDATION_LOG << "Failed to encode root pass blit command.";
1704 return false;
1705 }
1706 } else {
1707 auto render_pass = command_buffer->CreateRenderPass(render_target_);
1708 render_pass->SetLabel("EntityPass Root Render Pass");
1709
1710 {
1711 auto size_rect = Rect::MakeSize(offscreen_target.GetRenderTargetSize());
1712 auto contents = TextureContents::MakeRect(size_rect);
1713 contents->SetTexture(offscreen_target.GetRenderTargetTexture());
1714 contents->SetSourceRect(size_rect);
1715 contents->SetLabel("Root pass blit");
1716
1717 Entity entity;
1718 entity.SetContents(contents);
1719 entity.SetBlendMode(BlendMode::kSource);
1720
1721 if (!entity.Render(renderer_, *render_pass)) {
1722 VALIDATION_LOG << "Failed to render EntityPass root blit.";
1723 return false;
1724 }
1725 }
1726
1727 if (!render_pass->EncodeCommands()) {
1728 VALIDATION_LOG << "Failed to encode root pass command buffer.";
1729 return false;
1730 }
1731 }
1732
1733 if (is_onscreen) {
1734 return renderer_.GetContext()->SubmitOnscreen(std::move(command_buffer));
1735 } else {
1736 return renderer_.GetContext()->EnqueueCommandBuffer(
1737 std::move(command_buffer));
1738 }
1739 }
1740
1741 bool Canvas::EnsureFinalMipmapGeneration() const {
1742 if (!render_target_.GetRenderTargetTexture()->NeedsMipmapGeneration()) {
1743 return true;
1744 }
1745 std::shared_ptr<CommandBuffer> cmd_buffer =
1746 renderer_.GetContext()->CreateCommandBuffer();
1747 if (!cmd_buffer) {
1748 return false;
1749 }
1750 std::shared_ptr<BlitPass> blit_pass = cmd_buffer->CreateBlitPass();
1751 if (!blit_pass) {
1752 return false;
1753 }
1754 blit_pass->GenerateMipmap(render_target_.GetRenderTargetTexture());
1755 blit_pass->EncodeCommands();
1756 return renderer_.GetContext()->EnqueueCommandBuffer(std::move(cmd_buffer));
1757 }
1758
1759 void Canvas::EndReplay() {
1760 FML_DCHECK(render_passes_.size() == 1u);
1761 render_passes_.back().inline_pass_context->GetRenderPass();
1762 render_passes_.back().inline_pass_context->EndPass(
1763 /*is_onscreen=*/!requires_readback_ && is_onscreen_);
1764 backdrop_data_.clear();
1765
1766 // If requires_readback_ was true, then we rendered to an offscreen texture
1767 // instead of to the onscreen provided in the render target. Now we need to
1768 // draw or blit the offscreen back to the onscreen.
1769 if (requires_readback_) {
1770 BlitToOnscreen(/*is_onscreen_=*/is_onscreen_);
1771 }
1772 if (!EnsureFinalMipmapGeneration()) {
1773 VALIDATION_LOG << "Failed to generate onscreen mipmaps.";
1774 }
1775 if (!renderer_.GetContext()->FlushCommandBuffers()) {
1776 // Not much we can do.
1777 VALIDATION_LOG << "Failed to submit command buffers";
1778 }
1779 render_passes_.clear();
1780 renderer_.GetRenderTargetCache()->End();
1781 clip_geometry_.clear();
1782
1783 Reset();
1784 Initialize(initial_cull_rect_);
1785 }
1786
1787 } // namespace impeller
atlas_contents.h
canvas.h
circle_geometry.h
impeller::Canvas::ClipGeometry
void ClipGeometry(const Geometry &geometry, Entity::ClipOperation clip_op, bool is_aa=true)
Definition: canvas.cc:566
impeller::Canvas::kMaxDepth
static constexpr uint32_t kMaxDepth
Definition: canvas.h:117
impeller::Canvas::Canvas
Canvas(ContentContext &renderer, const RenderTarget &render_target, bool is_onscreen, bool requires_readback)
Definition: canvas.cc:164
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:935
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:966
impeller::Canvas::GetCurrentTransform
const Matrix & GetCurrentTransform() const
Definition: canvas.cc:238
impeller::Canvas::DrawVertices
void DrawVertices(const std::shared_ptr< VerticesGeometry > &vertices, BlendMode blend_mode, const Paint &paint)
Definition: canvas.cc:739
impeller::Canvas::DrawOval
void DrawOval(const Rect &rect, const Paint &paint)
Definition: canvas.cc:486
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:679
impeller::Canvas::RestoreToCount
void RestoreToCount(size_t count)
Definition: canvas.cc:285
impeller::Canvas::Restore
bool Restore()
Definition: canvas.cc:1204
impeller::Canvas::GetSaveCount
size_t GetSaveCount() const
Definition: canvas.cc:277
impeller::Canvas::Concat
void Concat(const Matrix &transform)
Definition: canvas.cc:222
impeller::Canvas::Transform
void Transform(const Matrix &transform)
Definition: canvas.cc:234
impeller::Canvas::BackdropFilterProc
std::function< std::shared_ptr< FilterContents >(FilterInput::Ref, const Matrix &effect_transform, Entity::RenderingMode rendering_mode)> BackdropFilterProc
Definition: canvas.h:122
impeller::Canvas::PreConcat
void PreConcat(const Matrix &transform)
Definition: canvas.cc:226
impeller::Canvas::Rotate
void Rotate(Radians radians)
Definition: canvas.cc:258
impeller::Canvas::DrawPoints
void DrawPoints(const Point points[], uint32_t count, Scalar radius, const Paint &paint, PointStyle point_style)
Definition: canvas.cc:647
impeller::Canvas::ResetTransform
void ResetTransform()
Definition: canvas.cc:230
impeller::Canvas::DrawTextFrame
void DrawTextFrame(const std::shared_ptr< TextFrame > &text_frame, Point position, const Paint &paint)
Definition: canvas.cc:1346
impeller::Canvas::DrawImage
void DrawImage(const std::shared_ptr< Texture > &image, Point offset, const Paint &paint, const SamplerDescriptor &sampler={})
Definition: canvas.cc:665
impeller::Canvas::DrawPaint
void DrawPaint(const Paint &paint)
Definition: canvas.cc:308
impeller::Canvas::DrawRoundRect
void DrawRoundRect(const RoundRect &rect, const Paint &paint)
Definition: canvas.cc:516
impeller::Canvas::Skew
void Skew(Scalar sx, Scalar sy)
Definition: canvas.cc:254
impeller::Canvas::Scale
void Scale(const Vector2 &scale)
Definition: canvas.cc:246
impeller::Canvas::DrawPath
void DrawPath(const Path &path, const Paint &paint)
Definition: canvas.cc:293
impeller::Canvas::Save
void Save(uint32_t total_content_depth=kMaxDepth)
Definition: canvas.cc:918
impeller::Canvas::DrawRect
void DrawRect(const Rect &rect, const Paint &paint)
Definition: canvas.cc:468
impeller::Canvas::DrawAtlas
void DrawAtlas(const std::shared_ptr< AtlasContents > &atlas_contents, const Paint &paint)
Definition: canvas.cc:852
impeller::Canvas::DrawLine
void DrawLine(const Point &p0, const Point &p1, const Paint &paint, bool reuse_depth=false)
Definition: canvas.cc:455
impeller::Canvas::Translate
void Translate(const Vector3 &offset)
Definition: canvas.cc:242
impeller::Canvas::DrawCircle
void DrawCircle(const Point &center, Scalar radius, const Paint &paint)
Definition: canvas.cc:543
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:36
impeller::ClipContents::SetClipOperation
void SetClipOperation(Entity::ClipOperation clip_op)
Definition: clip_contents.cc:40
impeller::ClipContents::Render
bool Render(const ContentContext &renderer, RenderPass &pass, uint32_t clip_depth) const
Definition: clip_contents.cc:69
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:371
impeller::ContentContext::GetDeviceCapabilities
const Capabilities & GetDeviceCapabilities() const
Definition: content_context.cc:617
impeller::ContentContext::GetRenderTargetCache
const std::shared_ptr< RenderTargetAllocator > & GetRenderTargetCache() const
Definition: content_context.h:838
impeller::ContentContext::GetContext
std::shared_ptr< Context > GetContext() const
Definition: content_context.cc:613
impeller::CoverGeometry
A geometry that implements "drawPaint" like behavior by covering the entire render pass area.
Definition: cover_geometry.h:14
impeller::EllipseGeometry
Definition: ellipse_geometry.h:16
impeller::Entity
Definition: entity.h:20
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:42
impeller::Entity::GetCoverage
std::optional< Rect > GetCoverage() const
Definition: entity.cc:64
impeller::Entity::RenderingMode
RenderingMode
Definition: entity.h:27
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:145
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:22
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:128
impeller::Entity::ClipOperation
ClipOperation
Definition: entity.h:61
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::FillPathGeometry
A geometry that is created from a filled path object.
Definition: fill_path_geometry.h:16
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:82
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:121
impeller::Geometry::GetCoverage
virtual std::optional< Rect > GetCoverage(const Matrix &transform) const =0
impeller::Geometry::IsAxisAlignedRect
virtual bool IsAxisAlignedRect() const
Definition: geometry.cc:117
impeller::LineGeometry
Definition: line_geometry.h:12
impeller::PathBuilder
Definition: path_builder.h:15
impeller::PathBuilder::AddRect
PathBuilder & AddRect(Rect rect)
Definition: path_builder.cc:129
impeller::PathBuilder::TakePath
Path TakePath(FillType fill=FillType::kNonZero)
Definition: path_builder.cc:28
impeller::PathBuilder::AddRoundRect
PathBuilder & AddRoundRect(RoundRect rect)
Definition: path_builder.cc:151
impeller::PathBuilder::SetBounds
PathBuilder & SetBounds(Rect bounds)
Set the bounding box that will be used by Path.GetBoundingBox in place of performing the computation.
Definition: path_builder.cc:510
impeller::PathBuilder::AddOval
PathBuilder & AddOval(const Rect &rect)
Definition: path_builder.cc:396
impeller::PathBuilder::SetConvexity
PathBuilder & SetConvexity(Convexity value)
Definition: path_builder.cc:97
impeller::Path
Paths are lightweight objects that describe a collection of linear, quadratic, or cubic segments....
Definition: path.h:53
impeller::PointFieldGeometry
A geometry class specialized for Canvas::DrawPoints.
Definition: point_field_geometry.h:16
impeller::RectGeometry
Definition: rect_geometry.h:12
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
Definition: round_rect_geometry.h:16
impeller::StrokePathGeometry
A geometry that is created from a stroked path object.
Definition: stroke_path_geometry.h:14
impeller::TextureContents::MakeRect
static std::shared_ptr< TextureContents > MakeRect(Rect destination)
A common case factory that marks the texture contents as having a destination rectangle....
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
path_builder.h
geometry.h
line_geometry.h
impeller::skia_conversions::ToSamplerDescriptor
impeller::SamplerDescriptor ToSamplerDescriptor(const flutter::DlImageSampling options)
Definition: skia_conversions.cc:141
impeller
Definition: allocation.cc:12
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::Scalar
float Scalar
Definition: scalar.h:18
impeller::SourceRectConstraint
SourceRectConstraint
Controls the behavior of the source rectangle given to DrawImageRect.
Definition: canvas.h:69
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:17
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:56
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:792
impeller::PointStyle
PointStyle
Definition: canvas.h:60
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::Convexity::kConvex
@ kConvex
impeller::GetCPUColorFilterProc
ColorFilterProc GetCPUColorFilterProc(const flutter::DlColorFilter *filter)
Definition: color_filter.cc:66
impeller::IRect
IRect64 IRect
Definition: rect.h:795
impeller::BlendMode
BlendMode
Definition: color.h:58
impeller::BlendMode::kDestination
@ kDestination
impeller::BlendMode::kSource
@ kSource
impeller::BlendMode::kSourceOver
@ kSourceOver
impeller::ContentBoundsPromise
ContentBoundsPromise
Definition: canvas.h:79
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:171
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:174
point_field_geometry.h
rect_geometry.h
round_rect_geometry.h
round_superellipse_geometry.h
save_layer_utils.h
skia_conversions.h
solid_rrect_blur_contents.h
scale
const Scalar scale
Definition: stroke_path_geometry.cc:316
offset
SeparatedVector2 offset
Definition: stroke_path_geometry.cc:319
stroke_path_geometry.h
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:35
impeller::BackdropData::all_filters_equal
bool all_filters_equal
Definition: canvas.h:37
impeller::BackdropData::texture_slot
std::shared_ptr< Texture > texture_slot
Definition: canvas.h:38
impeller::BackdropData::backdrop_count
size_t backdrop_count
Definition: canvas.h:36
impeller::BackdropData::shared_filter_snapshot
std::optional< Snapshot > shared_filter_snapshot
Definition: canvas.h:41
impeller::Canvas::SaveLayerState
Definition: canvas.h:246
impeller::Canvas::SaveLayerState::coverage
Rect coverage
Definition: canvas.h:248
impeller::Canvas::SaveLayerState::paint
Paint paint
Definition: canvas.h:247
impeller::CanvasStackEntry
Definition: canvas.h:45
impeller::CanvasStackEntry::clip_height
size_t clip_height
Definition: canvas.h:48
impeller::CanvasStackEntry::did_round_out
bool did_round_out
Definition: canvas.h:57
impeller::CanvasStackEntry::rendering_mode
Entity::RenderingMode rendering_mode
Definition: canvas.h:52
impeller::CanvasStackEntry::transform
Matrix transform
Definition: canvas.h:46
impeller::CanvasStackEntry::clip_depth
uint32_t clip_depth
Definition: canvas.h:47
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:269
impeller::Color::alpha
Scalar alpha
Definition: color.h:142
impeller::Color::White
static constexpr Color White()
Definition: color.h:263
impeller::Color::WithAlpha
constexpr Color WithAlpha(Scalar new_alpha) const
Definition: color.h:277
impeller::Color::ApplyColorMatrix
Color ApplyColorMatrix(const ColorMatrix &color_matrix) const
A color filter that transforms colors through a 4x5 color matrix.
Definition: color.cc:301
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::LazyRenderingConfig
Definition: canvas.h:94
impeller::LazyRenderingConfig::inline_pass_context
std::unique_ptr< InlinePassContext > inline_pass_context
Definition: canvas.h:96
impeller::LazyRenderingConfig::entity_pass_target
std::unique_ptr< EntityPassTarget > entity_pass_target
Definition: canvas.h:95
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:97
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::Paint
Definition: paint.h:26
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:246
impeller::Paint::color_filter
const flutter::DlColorFilter * color_filter
Definition: paint.h:76
impeller::Paint::color_source
const flutter::DlColorSource * color_source
Definition: paint.h:75
impeller::Paint::Style::kStroke
@ kStroke
impeller::Paint::Style::kFill
@ kFill
impeller::Paint::image_filter
const flutter::DlImageFilter * image_filter
Definition: paint.h:77
impeller::Paint::stroke_cap
Cap stroke_cap
Definition: paint.h:80
impeller::Paint::stroke_join
Join stroke_join
Definition: paint.h:81
impeller::Paint::stroke_miter
Scalar stroke_miter
Definition: paint.h:82
impeller::Paint::style
Style style
Definition: paint.h:83
impeller::Paint::WithMaskBlur
std::shared_ptr< Contents > WithMaskBlur(std::shared_ptr< Contents > input, bool is_solid_color, const Matrix &ctm) const
Definition: paint.cc:270
impeller::Paint::invert_colors
bool invert_colors
Definition: paint.h:85
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:39
impeller::Paint::mask_blur_descriptor
std::optional< MaskBlurDescriptor > mask_blur_descriptor
Definition: paint.h:87
impeller::Paint::color
Color color
Definition: paint.h:74
impeller::Paint::blend_mode
BlendMode blend_mode
Definition: paint.h:84
impeller::Paint::WithImageFilter
std::shared_ptr< FilterContents > WithImageFilter(const FilterInput::Variant &input, const Matrix &effect_transform, Entity::RenderingMode rendering_mode) const
Definition: paint.cc:280
impeller::Paint::CreateContents
std::shared_ptr< ColorSourceContents > CreateContents() const
Definition: paint.cc:37
impeller::Paint::HasColorFilter
bool HasColorFilter() const
Whether this paint has a color filter that can apply opacity.
Definition: paint.cc:437
impeller::Paint::stroke_width
Scalar stroke_width
Definition: paint.h:79
impeller::Radians
Definition: scalar.h:43
impeller::RoundRect
Definition: round_rect.h:15
impeller::RoundRect::GetRadii
constexpr const RoundingRadii & GetRadii() const
Definition: round_rect.h:44
impeller::RoundRect::GetBounds
constexpr const Rect & GetBounds() const
Definition: round_rect.h:43
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::TPoint< Scalar >
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:622
impeller::TRect::GetBottom
constexpr auto GetBottom() const
Definition: rect.h:361
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:476
impeller::TRect::GetTop
constexpr auto GetTop() const
Definition: rect.h:357
impeller::TRect::GetHeight
constexpr Type GetHeight() const
Returns the height of the rectangle, equivalent to |GetSize().height|.
Definition: rect.h:351
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:324
impeller::TRect::Intersection
constexpr std::optional< TRect > Intersection(const TRect &o) const
Definition: rect.h:532
impeller::TRect::IsEmpty
constexpr bool IsEmpty() const
Returns true if either of the width or height are 0, negative, or NaN.
Definition: rect.h:301
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:355
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:331
impeller::TRect< Scalar >::Round
Round(const TRect< U > &r)
Definition: rect.h:699
impeller::TRect::RoundOut
RoundOut(const TRect< U > &r)
Definition: rect.h:683
impeller::TRect::GetRight
constexpr auto GetRight() const
Definition: rect.h:359
impeller::TRect::IsSquare
constexpr bool IsSquare() const
Returns true if width and height are equal and neither is NaN.
Definition: rect.h:308
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:606
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:345
impeller::TRect::GetCenter
constexpr Point GetCenter() const
Get the center point as a |Point|.
Definition: rect.h:386
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::height
Type height
Definition: size.h:29
impeller::TSize::width
Type width
Definition: size.h:28
impeller::Vector3
Definition: vector.h:20
text_contents.h
texture_contents.h
validation.h
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:91
vertices_contents.h