| Flutter Impeller |

typographer_unittests.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 "flutter/display_list/testing/dl_test_snippets.h"
6 #include "flutter/testing/testing.h"
7 #include "gtest/gtest.h"
8 #include "impeller/core/host_buffer.h"
9 #include "impeller/playground/playground.h"
10 #include "impeller/playground/playground_test.h"
11 #include "impeller/typographer/backends/skia/text_frame_skia.h"
12 #include "impeller/typographer/backends/skia/typographer_context_skia.h"
13 #include "impeller/typographer/font_glyph_pair.h"
14 #include "impeller/typographer/lazy_glyph_atlas.h"
15 #include "impeller/typographer/rectangle_packer.h"
16 #include "third_party/skia/include/core/SkFont.h"
17 #include "third_party/skia/include/core/SkFontMgr.h"
18 #include "third_party/skia/include/core/SkRect.h"
19 #include "third_party/skia/include/core/SkTextBlob.h"
20 #include "third_party/skia/include/core/SkTypeface.h"
21 #include "txt/platform.h"
22
23 // TODO(zanderso): https://github.com/flutter/flutter/issues/127701
24 // NOLINTBEGIN(bugprone-unchecked-optional-access)
25
26 namespace impeller {
27 namespace testing {
28
29 using TypographerTest = PlaygroundTest;
30 INSTANTIATE_PLAYGROUND_SUITE(TypographerTest);
31
32 static std::shared_ptr<GlyphAtlas> CreateGlyphAtlas(
33 Context& context,
34 const TypographerContext* typographer_context,
35 HostBuffer& host_buffer,
36 GlyphAtlas::Type type,
37 Rational scale,
38 const std::shared_ptr<GlyphAtlasContext>& atlas_context,
39 const std::shared_ptr<TextFrame>& frame) {
40 frame->SetPerFrameData(scale, {0, 0}, Matrix(), std::nullopt);
41 return typographer_context->CreateGlyphAtlas(context, type, host_buffer,
42 atlas_context, {frame});
43 }
44
45 static std::shared_ptr<GlyphAtlas> CreateGlyphAtlas(
46 Context& context,
47 const TypographerContext* typographer_context,
48 HostBuffer& host_buffer,
49 GlyphAtlas::Type type,
50 Rational scale,
51 const std::shared_ptr<GlyphAtlasContext>& atlas_context,
52 const std::vector<std::shared_ptr<TextFrame>>& frames,
53 const std::vector<std::optional<GlyphProperties>>& properties) {
54 size_t offset = 0;
55 for (auto& frame : frames) {
56 frame->SetPerFrameData(scale, {0, 0}, Matrix(), properties[offset++]);
57 }
58 return typographer_context->CreateGlyphAtlas(context, type, host_buffer,
59 atlas_context, frames);
60 }
61
62 TEST_P(TypographerTest, CanConvertTextBlob) {
63 SkFont font = flutter::testing::CreateTestFontOfSize(12);
64 auto blob = SkTextBlob::MakeFromString(
65 "the quick brown fox jumped over the lazy dog.", font);
66 ASSERT_TRUE(blob);
67 auto frame = MakeTextFrameFromTextBlobSkia(blob);
68 ASSERT_EQ(frame->GetRunCount(), 1u);
69 for (const auto& run : frame->GetRuns()) {
70 ASSERT_TRUE(run.IsValid());
71 ASSERT_EQ(run.GetGlyphCount(), 45u);
72 }
73 }
74
75 TEST_P(TypographerTest, CanCreateRenderContext) {
76 auto context = TypographerContextSkia::Make();
77 ASSERT_TRUE(context && context->IsValid());
78 }
79
80 TEST_P(TypographerTest, CanCreateGlyphAtlas) {
81 auto context = TypographerContextSkia::Make();
82 auto atlas_context =
83 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
84 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
85 GetContext()->GetIdleWaiter());
86 ASSERT_TRUE(context && context->IsValid());
87 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
88 auto blob = SkTextBlob::MakeFromString("hello", sk_font);
89 ASSERT_TRUE(blob);
90 auto atlas =
91 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
92 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
93 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
94
95 ASSERT_NE(atlas, nullptr);
96 ASSERT_NE(atlas->GetTexture(), nullptr);
97 ASSERT_EQ(atlas->GetType(), GlyphAtlas::Type::kAlphaBitmap);
98 ASSERT_EQ(atlas->GetGlyphCount(), 4llu);
99
100 std::optional<impeller::ScaledFont> first_scaled_font;
101 std::optional<impeller::SubpixelGlyph> first_glyph;
102 Rect first_rect;
103 atlas->IterateGlyphs([&](const ScaledFont& scaled_font,
104 const SubpixelGlyph& glyph,
105 const Rect& rect) -> bool {
106 first_scaled_font = scaled_font;
107 first_glyph = glyph;
108 first_rect = rect;
109 return false;
110 });
111
112 ASSERT_TRUE(first_scaled_font.has_value());
113 ASSERT_TRUE(atlas
114 ->FindFontGlyphBounds(
115 {first_scaled_font.value(), first_glyph.value()})
116 .has_value());
117 }
118
119 TEST_P(TypographerTest, LazyAtlasTracksColor) {
120 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
121 GetContext()->GetIdleWaiter());
122 #if FML_OS_MACOSX
123 auto mapping = flutter::testing::OpenFixtureAsSkData("Apple Color Emoji.ttc");
124 #else
125 auto mapping = flutter::testing::OpenFixtureAsSkData("NotoColorEmoji.ttf");
126 #endif
127 ASSERT_TRUE(mapping);
128 sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
129 SkFont emoji_font(font_mgr->makeFromData(mapping), 50.0);
130 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
131
132 auto blob = SkTextBlob::MakeFromString("hello", sk_font);
133 ASSERT_TRUE(blob);
134 auto frame = MakeTextFrameFromTextBlobSkia(blob);
135
136 ASSERT_FALSE(frame->GetAtlasType() == GlyphAtlas::Type::kColorBitmap);
137
138 LazyGlyphAtlas lazy_atlas(TypographerContextSkia::Make());
139
140 lazy_atlas.AddTextFrame(frame, Rational(1), {0, 0}, Matrix(), {});
141
142 frame = MakeTextFrameFromTextBlobSkia(
143 SkTextBlob::MakeFromString("😀 ", emoji_font));
144
145 ASSERT_TRUE(frame->GetAtlasType() == GlyphAtlas::Type::kColorBitmap);
146
147 lazy_atlas.AddTextFrame(frame, Rational(1), {0, 0}, Matrix(), {});
148
149 // Creates different atlases for color and red bitmap.
150 auto color_atlas = lazy_atlas.CreateOrGetGlyphAtlas(
151 *GetContext(), *host_buffer, GlyphAtlas::Type::kColorBitmap);
152
153 auto bitmap_atlas = lazy_atlas.CreateOrGetGlyphAtlas(
154 *GetContext(), *host_buffer, GlyphAtlas::Type::kAlphaBitmap);
155
156 ASSERT_FALSE(color_atlas == bitmap_atlas);
157 }
158
159 TEST_P(TypographerTest, GlyphAtlasWithOddUniqueGlyphSize) {
160 auto context = TypographerContextSkia::Make();
161 auto atlas_context =
162 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
163 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
164 GetContext()->GetIdleWaiter());
165 ASSERT_TRUE(context && context->IsValid());
166 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
167 auto blob = SkTextBlob::MakeFromString("AGH", sk_font);
168 ASSERT_TRUE(blob);
169 auto atlas =
170 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
171 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
172 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
173 ASSERT_NE(atlas, nullptr);
174 ASSERT_NE(atlas->GetTexture(), nullptr);
175
176 EXPECT_EQ(atlas->GetTexture()->GetSize().width, 4096u);
177 EXPECT_EQ(atlas->GetTexture()->GetSize().height, 1024u);
178 }
179
180 TEST_P(TypographerTest, GlyphAtlasIsRecycledIfUnchanged) {
181 auto context = TypographerContextSkia::Make();
182 auto atlas_context =
183 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
184 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
185 GetContext()->GetIdleWaiter());
186 ASSERT_TRUE(context && context->IsValid());
187 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
188 auto blob = SkTextBlob::MakeFromString("spooky skellingtons", sk_font);
189 ASSERT_TRUE(blob);
190 auto atlas =
191 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
192 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
193 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
194 ASSERT_NE(atlas, nullptr);
195 ASSERT_NE(atlas->GetTexture(), nullptr);
196 ASSERT_EQ(atlas, atlas_context->GetGlyphAtlas());
197
198 // now attempt to re-create an atlas with the same text blob.
199
200 auto next_atlas =
201 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
202 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
203 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
204 ASSERT_EQ(atlas, next_atlas);
205 ASSERT_EQ(atlas_context->GetGlyphAtlas(), atlas);
206 }
207
208 TEST_P(TypographerTest, GlyphAtlasWithLotsOfdUniqueGlyphSize) {
209 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
210 GetContext()->GetIdleWaiter());
211 auto context = TypographerContextSkia::Make();
212 auto atlas_context =
213 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
214 ASSERT_TRUE(context && context->IsValid());
215
216 const char* test_string =
217 "QWERTYUIOPASDFGHJKLZXCVBNMqewrtyuiopasdfghjklzxcvbnm,.<>[]{};':"
218 "2134567890-=!@#$%^&*()_+"
219 "œ∑´®†¥¨ˆøπ““‘‘åß∂ƒ©˙∆˚¬…æ≈ç√∫˜µ≤≥≥≥≥÷¡™£¢∞§¶•ªº–≠⁄€‹›ﬁﬂ‡°·‚—±Œ„´‰Á¨Ø∏”’/"
220 "* Í˝ */¸˛Ç◊ı˜Â¯˘¿";
221
222 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
223 auto blob = SkTextBlob::MakeFromString(test_string, sk_font);
224 ASSERT_TRUE(blob);
225
226 size_t size_count = 8;
227 std::vector<std::shared_ptr<TextFrame>> frames;
228 for (size_t index = 0; index < size_count; index += 1) {
229 frames.push_back(MakeTextFrameFromTextBlobSkia(blob));
230 frames.back()->SetPerFrameData(Rational(6 * index, 10), {0, 0}, Matrix(),
231 {});
232 };
233 auto atlas =
234 context->CreateGlyphAtlas(*GetContext(), GlyphAtlas::Type::kAlphaBitmap,
235 *host_buffer, atlas_context, frames);
236 ASSERT_NE(atlas, nullptr);
237 ASSERT_NE(atlas->GetTexture(), nullptr);
238
239 std::set<uint16_t> unique_glyphs;
240 std::vector<uint16_t> total_glyphs;
241 atlas->IterateGlyphs([&](const ScaledFont& scaled_font,
242 const SubpixelGlyph& glyph, const Rect& rect) {
243 unique_glyphs.insert(glyph.glyph.index);
244 total_glyphs.push_back(glyph.glyph.index);
245 return true;
246 });
247
248 // These numbers may be different due to subpixel positions.
249 EXPECT_LE(unique_glyphs.size() * size_count, atlas->GetGlyphCount());
250 EXPECT_EQ(total_glyphs.size(), atlas->GetGlyphCount());
251
252 EXPECT_TRUE(atlas->GetGlyphCount() > 0);
253 EXPECT_TRUE(atlas->GetTexture()->GetSize().width > 0);
254 EXPECT_TRUE(atlas->GetTexture()->GetSize().height > 0);
255 }
256
257 TEST_P(TypographerTest, GlyphAtlasTextureIsRecycledIfUnchanged) {
258 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
259 GetContext()->GetIdleWaiter());
260 auto context = TypographerContextSkia::Make();
261 auto atlas_context =
262 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
263 ASSERT_TRUE(context && context->IsValid());
264 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
265 auto blob = SkTextBlob::MakeFromString("spooky 1", sk_font);
266 ASSERT_TRUE(blob);
267 auto atlas =
268 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
269 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
270 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
271 auto old_packer = atlas_context->GetRectPacker();
272
273 ASSERT_NE(atlas, nullptr);
274 ASSERT_NE(atlas->GetTexture(), nullptr);
275 ASSERT_EQ(atlas, atlas_context->GetGlyphAtlas());
276
277 auto* first_texture = atlas->GetTexture().get();
278
279 // Now create a new glyph atlas with a nearly identical blob.
280
281 auto blob2 = SkTextBlob::MakeFromString("spooky 2", sk_font);
282 auto next_atlas =
283 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
284 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
285 atlas_context, MakeTextFrameFromTextBlobSkia(blob2));
286 ASSERT_EQ(atlas, next_atlas);
287 auto* second_texture = next_atlas->GetTexture().get();
288
289 auto new_packer = atlas_context->GetRectPacker();
290
291 ASSERT_EQ(second_texture, first_texture);
292 ASSERT_EQ(old_packer, new_packer);
293 }
294
295 TEST_P(TypographerTest, GlyphColorIsPartOfCacheKey) {
296 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
297 GetContext()->GetIdleWaiter());
298 #if FML_OS_MACOSX
299 auto mapping = flutter::testing::OpenFixtureAsSkData("Apple Color Emoji.ttc");
300 #else
301 auto mapping = flutter::testing::OpenFixtureAsSkData("NotoColorEmoji.ttf");
302 #endif
303 ASSERT_TRUE(mapping);
304 sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
305 SkFont emoji_font(font_mgr->makeFromData(mapping), 50.0);
306
307 auto context = TypographerContextSkia::Make();
308 auto atlas_context =
309 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kColorBitmap);
310
311 // Create two frames with the same character and a different color, expect
312 // that it adds a character.
313 auto frame = MakeTextFrameFromTextBlobSkia(
314 SkTextBlob::MakeFromString("😂", emoji_font));
315 auto frame_2 = MakeTextFrameFromTextBlobSkia(
316 SkTextBlob::MakeFromString("😂", emoji_font));
317 std::vector<std::optional<GlyphProperties>> properties = {
318 GlyphProperties{.color = Color::Red()},
319 GlyphProperties{.color = Color::Blue()},
320 };
321
322 auto next_atlas =
323 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
324 GlyphAtlas::Type::kColorBitmap, Rational(1),
325 atlas_context, {frame, frame_2}, properties);
326
327 EXPECT_EQ(next_atlas->GetGlyphCount(), 2u);
328 }
329
330 TEST_P(TypographerTest, GlyphColorIsIgnoredForNonEmojiFonts) {
331 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
332 GetContext()->GetIdleWaiter());
333 sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
334 sk_sp<SkTypeface> typeface =
335 font_mgr->matchFamilyStyle("Arial", SkFontStyle::Normal());
336 SkFont sk_font(typeface, 0.5f);
337
338 auto context = TypographerContextSkia::Make();
339 auto atlas_context =
340 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kColorBitmap);
341
342 // Create two frames with the same character and a different color, but as a
343 // non-emoji font the text frame constructor will ignore it.
344 auto frame =
345 MakeTextFrameFromTextBlobSkia(SkTextBlob::MakeFromString("A", sk_font));
346 auto frame_2 =
347 MakeTextFrameFromTextBlobSkia(SkTextBlob::MakeFromString("A", sk_font));
348 std::vector<std::optional<GlyphProperties>> properties = {
349 GlyphProperties{},
350 GlyphProperties{},
351 };
352
353 auto next_atlas =
354 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
355 GlyphAtlas::Type::kColorBitmap, Rational(1),
356 atlas_context, {frame, frame_2}, properties);
357
358 EXPECT_EQ(next_atlas->GetGlyphCount(), 1u);
359 }
360
361 TEST_P(TypographerTest, RectanglePackerAddsNonoverlapingRectangles) {
362 auto packer = RectanglePacker::Factory(200, 100);
363 ASSERT_NE(packer, nullptr);
364 ASSERT_EQ(packer->PercentFull(), 0);
365
366 const SkIRect packer_area = SkIRect::MakeXYWH(0, 0, 200, 100);
367
368 IPoint16 first_output = {-1, -1}; // Fill with sentinel values
369 ASSERT_TRUE(packer->AddRect(20, 20, &first_output));
370 // Make sure the rectangle is placed such that it is inside the bounds of
371 // the packer's area.
372 const SkIRect first_rect =
373 SkIRect::MakeXYWH(first_output.x(), first_output.y(), 20, 20);
374 ASSERT_TRUE(SkIRect::Intersects(packer_area, first_rect));
375
376 // Initial area was 200 x 100 = 20_000
377 // We added 20x20 = 400. 400 / 20_000 == 0.02 == 2%
378 ASSERT_TRUE(flutter::testing::NumberNear(packer->PercentFull(), 0.02));
379
380 IPoint16 second_output = {-1, -1};
381 ASSERT_TRUE(packer->AddRect(140, 90, &second_output));
382 const SkIRect second_rect =
383 SkIRect::MakeXYWH(second_output.x(), second_output.y(), 140, 90);
384 // Make sure the rectangle is placed such that it is inside the bounds of
385 // the packer's area but not in the are of the first rectangle.
386 ASSERT_TRUE(SkIRect::Intersects(packer_area, second_rect));
387 ASSERT_FALSE(SkIRect::Intersects(first_rect, second_rect));
388
389 // We added another 90 x 140 = 12_600 units, now taking us to 13_000
390 // 13_000 / 20_000 == 0.65 == 65%
391 ASSERT_TRUE(flutter::testing::NumberNear(packer->PercentFull(), 0.65));
392
393 // There's enough area to add this rectangle, but no space big enough for
394 // the 50 units of width.
395 IPoint16 output;
396 ASSERT_FALSE(packer->AddRect(50, 50, &output));
397 // Should be unchanged.
398 ASSERT_TRUE(flutter::testing::NumberNear(packer->PercentFull(), 0.65));
399
400 packer->Reset();
401 // Should be empty now.
402 ASSERT_EQ(packer->PercentFull(), 0);
403 }
404
405 TEST(TypographerTest, RectanglePackerFillsRows) {
406 auto skyline = RectanglePacker::Factory(257, 256);
407
408 // Fill up the first row.
409 IPoint16 loc;
410 for (auto i = 0u; i < 16; i++) {
411 skyline->AddRect(16, 16, &loc);
412 }
413 // Last rectangle still in first row.
414 EXPECT_EQ(loc.x(), 256 - 16);
415 EXPECT_EQ(loc.y(), 0);
416
417 // Fill up second row.
418 for (auto i = 0u; i < 16; i++) {
419 skyline->AddRect(16, 16, &loc);
420 }
421
422 EXPECT_EQ(loc.x(), 256 - 16);
423 EXPECT_EQ(loc.y(), 16);
424 }
425
426 TEST_P(TypographerTest, GlyphAtlasTextureWillGrowTilMaxTextureSize) {
427 if (GetBackend() == PlaygroundBackend::kOpenGLES) {
428 GTEST_SKIP() << "Atlas growth isn't supported for OpenGLES currently.";
429 }
430
431 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
432 GetContext()->GetIdleWaiter());
433 auto context = TypographerContextSkia::Make();
434 auto atlas_context =
435 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
436 ASSERT_TRUE(context && context->IsValid());
437 SkFont sk_font = flutter::testing::CreateTestFontOfSize(12);
438 auto blob = SkTextBlob::MakeFromString("A", sk_font);
439 ASSERT_TRUE(blob);
440 auto atlas =
441 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
442 GlyphAtlas::Type::kAlphaBitmap, Rational(1),
443 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
444 // Continually append new glyphs until the glyph size grows to the maximum.
445 // Note that the sizes here are more or less experimentally determined, but
446 // the important expectation is that the atlas size will shrink again after
447 // growing to the maximum size.
448 constexpr ISize expected_sizes[13] = {
449 {4096, 4096}, //
450 {4096, 4096}, //
451 {4096, 8192}, //
452 {4096, 8192}, //
453 {4096, 8192}, //
454 {4096, 8192}, //
455 {4096, 16384}, //
456 {4096, 16384}, //
457 {4096, 16384}, //
458 {4096, 16384}, //
459 {4096, 16384}, //
460 {4096, 16384}, //
461 {4096, 4096} // Shrinks!
462 };
463
464 SkFont sk_font_small = flutter::testing::CreateTestFontOfSize(10);
465
466 for (int i = 0; i < 13; i++) {
467 SkTextBlobBuilder builder;
468
469 auto add_char = [&](const SkFont& sk_font, char c) {
470 int count = sk_font.countText(&c, 1, SkTextEncoding::kUTF8);
471 auto buffer = builder.allocRunPos(sk_font, count);
472 sk_font.textToGlyphs(&c, 1, SkTextEncoding::kUTF8, buffer.glyphs, count);
473 sk_font.getPos(buffer.glyphs, count, buffer.points(), {0, 0});
474 };
475
476 SkFont sk_font = flutter::testing::CreateTestFontOfSize(50 + i);
477 add_char(sk_font, 'A');
478 add_char(sk_font_small, 'B');
479 auto blob = builder.make();
480
481 atlas =
482 CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
483 GlyphAtlas::Type::kAlphaBitmap, Rational(50 + i, 1),
484 atlas_context, MakeTextFrameFromTextBlobSkia(blob));
485 ASSERT_TRUE(!!atlas);
486 EXPECT_EQ(atlas->GetTexture()->GetTextureDescriptor().size,
487 expected_sizes[i]);
488 }
489
490 // The final atlas should contain both the "A" glyph (which was not present
491 // in the previous atlas) and the "B" glyph (which existed in the previous
492 // atlas).
493 ASSERT_EQ(atlas->GetGlyphCount(), 2u);
494 }
495
496 TEST_P(TypographerTest, TextFrameInitialBoundsArePlaceholder) {
497 SkFont font = flutter::testing::CreateTestFontOfSize(12);
498 auto blob = SkTextBlob::MakeFromString(
499 "the quick brown fox jumped over the lazy dog.", font);
500 ASSERT_TRUE(blob);
501 auto frame = MakeTextFrameFromTextBlobSkia(blob);
502
503 EXPECT_FALSE(frame->IsFrameComplete());
504
505 auto context = TypographerContextSkia::Make();
506 auto atlas_context =
507 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
508 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
509 GetContext()->GetIdleWaiter());
510
511 auto atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
512 GlyphAtlas::Type::kAlphaBitmap,
513 /*scale=*/Rational(1), atlas_context, frame);
514
515 // The glyph position in the atlas was not known when this value
516 // was recorded. It is marked as a placeholder.
517 EXPECT_TRUE(frame->IsFrameComplete());
518 EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
519
520 atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
521 GlyphAtlas::Type::kAlphaBitmap,
522 /*scale=*/Rational(1), atlas_context, frame);
523
524 // The second time the glyph is rendered, the bounds are correcly known.
525 EXPECT_TRUE(frame->IsFrameComplete());
526 EXPECT_FALSE(frame->GetFrameBounds(0).is_placeholder);
527 }
528
529 TEST_P(TypographerTest, TextFrameInvalidationWithScale) {
530 SkFont font = flutter::testing::CreateTestFontOfSize(12);
531 auto blob = SkTextBlob::MakeFromString(
532 "the quick brown fox jumped over the lazy dog.", font);
533 ASSERT_TRUE(blob);
534 auto frame = MakeTextFrameFromTextBlobSkia(blob);
535
536 EXPECT_FALSE(frame->IsFrameComplete());
537
538 auto context = TypographerContextSkia::Make();
539 auto atlas_context =
540 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
541 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
542 GetContext()->GetIdleWaiter());
543
544 auto atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
545 GlyphAtlas::Type::kAlphaBitmap,
546 /*scale=*/Rational(1), atlas_context, frame);
547
548 // The glyph position in the atlas was not known when this value
549 // was recorded. It is marked as a placeholder.
550 EXPECT_TRUE(frame->IsFrameComplete());
551 EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
552
553 // Change the scale and the glyph data will still be a placeholder, as the
554 // old data is no longer valid.
555 atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
556 GlyphAtlas::Type::kAlphaBitmap,
557 /*scale=*/Rational(2), atlas_context, frame);
558
559 // The second time the glyph is rendered, the bounds are correcly known.
560 EXPECT_TRUE(frame->IsFrameComplete());
561 EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
562 }
563
564 TEST_P(TypographerTest, TextFrameAtlasGenerationTracksState) {
565 SkFont font = flutter::testing::CreateTestFontOfSize(12);
566 auto blob = SkTextBlob::MakeFromString(
567 "the quick brown fox jumped over the lazy dog.", font);
568 ASSERT_TRUE(blob);
569 auto frame = MakeTextFrameFromTextBlobSkia(blob);
570
571 EXPECT_FALSE(frame->IsFrameComplete());
572
573 auto context = TypographerContextSkia::Make();
574 auto atlas_context =
575 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
576 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
577 GetContext()->GetIdleWaiter());
578
579 auto atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
580 GlyphAtlas::Type::kAlphaBitmap,
581 /*scale=*/Rational(1), atlas_context, frame);
582
583 // The glyph position in the atlas was not known when this value
584 // was recorded. It is marked as a placeholder.
585 EXPECT_TRUE(frame->IsFrameComplete());
586 EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
587 if (GetBackend() == PlaygroundBackend::kOpenGLES) {
588 // OpenGLES must always increase the atlas backend if the texture grows.
589 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 1u);
590 } else {
591 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 0u);
592 }
593
594 atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
595 GlyphAtlas::Type::kAlphaBitmap,
596 /*scale=*/Rational(1), atlas_context, frame);
597
598 // The second time the glyph is rendered, the bounds are correcly known.
599 EXPECT_TRUE(frame->IsFrameComplete());
600 EXPECT_FALSE(frame->GetFrameBounds(0).is_placeholder);
601 if (GetBackend() == PlaygroundBackend::kOpenGLES) {
602 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 1u);
603 } else {
604 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 0u);
605 }
606
607 // Force increase the generation.
608 atlas_context->GetGlyphAtlas()->SetAtlasGeneration(2u);
609 atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
610 GlyphAtlas::Type::kAlphaBitmap,
611 /*scale=*/Rational(1), atlas_context, frame);
612
613 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 2u);
614 }
615
616 TEST_P(TypographerTest, InvalidAtlasForcesRepopulation) {
617 SkFont font = flutter::testing::CreateTestFontOfSize(12);
618 auto blob = SkTextBlob::MakeFromString(
619 "the quick brown fox jumped over the lazy dog.", font);
620 ASSERT_TRUE(blob);
621 auto frame = MakeTextFrameFromTextBlobSkia(blob);
622
623 EXPECT_FALSE(frame->IsFrameComplete());
624
625 auto context = TypographerContextSkia::Make();
626 auto atlas_context =
627 context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
628 auto host_buffer = HostBuffer::Create(GetContext()->GetResourceAllocator(),
629 GetContext()->GetIdleWaiter());
630
631 auto atlas = CreateGlyphAtlas(*GetContext(), context.get(), *host_buffer,
632 GlyphAtlas::Type::kAlphaBitmap,
633 /*scale=*/Rational(1), atlas_context, frame);
634
635 // The glyph position in the atlas was not known when this value
636 // was recorded. It is marked as a placeholder.
637 EXPECT_TRUE(frame->IsFrameComplete());
638 EXPECT_TRUE(frame->GetFrameBounds(0).is_placeholder);
639 if (GetBackend() == PlaygroundBackend::kOpenGLES) {
640 // OpenGLES must always increase the atlas backend if the texture grows.
641 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 1u);
642 } else {
643 EXPECT_EQ(frame->GetAtlasGenerationAndID().first, 0u);
644 }
645
646 auto second_context = TypographerContextSkia::Make();
647 auto second_atlas_context =
648 second_context->CreateGlyphAtlasContext(GlyphAtlas::Type::kAlphaBitmap);
649
650 EXPECT_FALSE(second_atlas_context->GetGlyphAtlas()->IsValid());
651
652 atlas = CreateGlyphAtlas(*GetContext(), second_context.get(), *host_buffer,
653 GlyphAtlas::Type::kAlphaBitmap,
654 /*scale=*/Rational(1), second_atlas_context, frame);
655
656 EXPECT_TRUE(second_atlas_context->GetGlyphAtlas()->IsValid());
657 }
658
659 } // namespace testing
660 } // namespace impeller
661
662 // NOLINTEND(bugprone-unchecked-optional-access)
type
GLenum type
Definition: blit_command_gles.cc:151
impeller::Context
To do anything rendering related with Impeller, you need a context.
Definition: context.h:47
impeller::GlyphAtlas::Type
Type
Describes how the glyphs are represented in the texture.
Definition: glyph_atlas.h:74
impeller::GlyphAtlas::Type::kAlphaBitmap
@ kAlphaBitmap
impeller::GlyphAtlas::Type::kColorBitmap
@ kColorBitmap
impeller::HostBuffer
Definition: host_buffer.h:28
impeller::HostBuffer::Create
static std::shared_ptr< HostBuffer > Create(const std::shared_ptr< Allocator > &allocator, const std::shared_ptr< const IdleWaiter > &idle_waiter)
Definition: host_buffer.cc:21
impeller::LazyGlyphAtlas
Definition: lazy_glyph_atlas.h:16
impeller::LazyGlyphAtlas::CreateOrGetGlyphAtlas
const std::shared_ptr< GlyphAtlas > & CreateOrGetGlyphAtlas(Context &context, HostBuffer &host_buffer, GlyphAtlas::Type type) const
Definition: lazy_glyph_atlas.cc:55
impeller::LazyGlyphAtlas::AddTextFrame
void AddTextFrame(const std::shared_ptr< TextFrame > &frame, Rational scale, Point offset, const Matrix &transform, std::optional< GlyphProperties > properties)
Definition: lazy_glyph_atlas.cc:34
impeller::PlaygroundTest
Definition: playground_test.h:22
impeller::Rational
Definition: rational.h:13
impeller::RectanglePacker::Factory
static std::shared_ptr< RectanglePacker > Factory(int width, int height)
Return an empty packer with area specified by width and height.
Definition: rectangle_packer.cc:175
impeller::TypographerContext
The graphics context necessary to render text.
Definition: typographer_context.h:23
impeller::TypographerContext::CreateGlyphAtlas
virtual std::shared_ptr< GlyphAtlas > CreateGlyphAtlas(Context &context, GlyphAtlas::Type type, HostBuffer &host_buffer, const std::shared_ptr< GlyphAtlasContext > &atlas_context, const std::vector< std::shared_ptr< TextFrame >> &text_frames) const =0
impeller::TypographerContextSkia::Make
static std::shared_ptr< TypographerContext > Make()
Definition: typographer_context_skia.cc:77
font_glyph_pair.h
NumberNear
bool NumberNear(double a, double b)
Definition: geometry_asserts.h:18
host_buffer.h
lazy_glyph_atlas.h
impeller::testing::TEST
TEST(AllocationSizeTest, CanCreateTypedAllocations)
Definition: allocation_size_unittests.cc:10
impeller::testing::TEST_P
TEST_P(AiksTest, DrawAtlasNoColor)
Definition: aiks_dl_atlas_unittests.cc:60
impeller::testing::INSTANTIATE_PLAYGROUND_SUITE
INSTANTIATE_PLAYGROUND_SUITE(AiksTest)
impeller::testing::CreateGlyphAtlas
static std::shared_ptr< GlyphAtlas > CreateGlyphAtlas(Context &context, const TypographerContext *typographer_context, HostBuffer &host_buffer, GlyphAtlas::Type type, Rational scale, const std::shared_ptr< GlyphAtlasContext > &atlas_context, const std::shared_ptr< TextFrame > &frame)
Definition: typographer_unittests.cc:32
impeller
Definition: allocation.cc:12
impeller::PlaygroundBackend::kOpenGLES
@ kOpenGLES
impeller::MakeTextFrameFromTextBlobSkia
std::shared_ptr< TextFrame > MakeTextFrameFromTextBlobSkia(const sk_sp< SkTextBlob > &blob)
Definition: text_frame_skia.cc:45
playground_test.h
playground.h
rectangle_packer.h
scale
const Scalar scale
Definition: stroke_path_geometry.cc:319
offset
SeparatedVector2 offset
Definition: stroke_path_geometry.cc:322
impeller::Color::Red
static constexpr Color Red()
Definition: color.h:272
impeller::Color::Blue
static constexpr Color Blue()
Definition: color.h:276
impeller::Glyph::index
uint16_t index
Definition: glyph.h:22
impeller::GlyphProperties
Definition: font_glyph_pair.h:17
impeller::GlyphProperties::color
Color color
Definition: font_glyph_pair.h:18
impeller::IPoint16
Definition: rectangle_packer.h:16
impeller::IPoint16::y
int16_t y() const
Definition: rectangle_packer.h:18
impeller::IPoint16::x
int16_t x() const
Definition: rectangle_packer.h:17
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::ScaledFont
A font and a scale. Used as a key that represents a typeface within a glyph atlas.
Definition: font_glyph_pair.h:41
impeller::SubpixelGlyph
A glyph and its subpixel position.
Definition: font_glyph_pair.h:90
impeller::SubpixelGlyph::glyph
Glyph glyph
Definition: font_glyph_pair.h:91
impeller::TRect< Scalar >
impeller::TSize
Definition: size.h:25
text_frame_skia.h
typographer_context_skia.h