| Flutter Impeller |

text_contents.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/entity/contents/text_contents.h"
6
7 #include <cstring>
8 #include <optional>
9 #include <utility>
10
11 #include "impeller/core/buffer_view.h"
12 #include "impeller/core/formats.h"
13 #include "impeller/core/sampler_descriptor.h"
14 #include "impeller/entity/entity.h"
15 #include "impeller/geometry/color.h"
16 #include "impeller/geometry/point.h"
17 #include "impeller/renderer/render_pass.h"
18 #include "impeller/typographer/glyph_atlas.h"
19
20 namespace impeller {
21 Point SizeToPoint(Size size) {
22 return Point(size.width, size.height);
23 }
24
25 using VS = GlyphAtlasPipeline::VertexShader;
26 using FS = GlyphAtlasPipeline::FragmentShader;
27
28 TextContents::TextContents() = default;
29
30 TextContents::~TextContents() = default;
31
32 void TextContents::SetTextFrame(const std::shared_ptr<TextFrame>& frame) {
33 frame_ = frame;
34 }
35
36 void TextContents::SetColor(Color color) {
37 color_ = color;
38 }
39
40 Color TextContents::GetColor() const {
41 return color_.WithAlpha(color_.alpha * inherited_opacity_);
42 }
43
44 void TextContents::SetInheritedOpacity(Scalar opacity) {
45 inherited_opacity_ = opacity;
46 }
47
48 void TextContents::SetOffset(Vector2 offset) {
49 offset_ = offset;
50 }
51
52 void TextContents::SetForceTextColor(bool value) {
53 force_text_color_ = value;
54 }
55
56 std::optional<Rect> TextContents::GetCoverage(const Entity& entity) const {
57 return frame_->GetBounds().TransformBounds(entity.GetTransform());
58 }
59
60 void TextContents::SetTextProperties(
61 Color color,
62 const std::optional<StrokeParameters>& stroke) {
63 if (frame_->HasColor()) {
64 // Alpha is always applied when rendering, remove it here so
65 // we do not double-apply the alpha.
66 properties_.color = color.WithAlpha(1.0);
67 }
68 properties_.stroke = stroke;
69 }
70
71 namespace {
72 Scalar AttractToOne(Scalar x) {
73 // Epsilon was decided by looking at the floating point inaccuracies in
74 // the ScaledK test.
75 const Scalar epsilon = 0.005f;
76 if (std::abs(x - 1.f) < epsilon) {
77 return 1.f;
78 }
79 if (std::abs(x + 1.f) < epsilon) {
80 return -1.f;
81 }
82 return x;
83 }
84
85 } // namespace
86
87 void TextContents::ComputeVertexData(
88 VS::PerVertexData* vtx_contents,
89 const std::shared_ptr<TextFrame>& frame,
90 Scalar scale,
91 const Matrix& entity_transform,
92 Vector2 offset,
93 std::optional<GlyphProperties> glyph_properties,
94 const std::shared_ptr<GlyphAtlas>& atlas) {
95 // Common vertex information for all glyphs.
96 // All glyphs are given the same vertex information in the form of a
97 // unit-sized quad. The size of the glyph is specified in per instance data
98 // and the vertex shader uses this to size the glyph correctly. The
99 // interpolated vertex information is also used in the fragment shader to
100 // sample from the glyph atlas.
101
102 constexpr std::array<Point, 4> unit_points = {Point{0, 0}, Point{1, 0},
103 Point{0, 1}, Point{1, 1}};
104
105 ISize atlas_size = atlas->GetTexture()->GetSize();
106 bool is_translation_scale = entity_transform.IsTranslationScaleOnly();
107 Matrix basis_transform = entity_transform.Basis();
108
109 VS::PerVertexData vtx;
110 size_t i = 0u;
111 size_t bounds_offset = 0u;
112 Rational rounded_scale = frame->GetScale();
113 Scalar inverted_rounded_scale = static_cast<Scalar>(rounded_scale.Invert());
114 Matrix unscaled_basis =
115 basis_transform *
116 Matrix::MakeScale({inverted_rounded_scale, inverted_rounded_scale, 1});
117
118 // In typical scales < 48x these values should be -1 or 1. We round to
119 // those to avoid inaccuracies.
120 unscaled_basis.m[0] = AttractToOne(unscaled_basis.m[0]);
121 unscaled_basis.m[5] = AttractToOne(unscaled_basis.m[5]);
122
123 for (const TextRun& run : frame->GetRuns()) {
124 const Font& font = run.GetFont();
125 const Matrix transform = frame->GetOffsetTransform();
126 FontGlyphAtlas* font_atlas = nullptr;
127
128 // Adjust glyph position based on the subpixel rounding
129 // used by the font.
130 Point subpixel_adjustment(0.5, 0.5);
131 switch (font.GetAxisAlignment()) {
132 case AxisAlignment::kNone:
133 break;
134 case AxisAlignment::kX:
135 subpixel_adjustment.x = 0.125;
136 break;
137 case AxisAlignment::kY:
138 subpixel_adjustment.y = 0.125;
139 break;
140 case AxisAlignment::kAll:
141 subpixel_adjustment.x = 0.125;
142 subpixel_adjustment.y = 0.125;
143 break;
144 }
145
146 Point screen_offset = (entity_transform * Point(0, 0));
147 for (const TextRun::GlyphPosition& glyph_position :
148 run.GetGlyphPositions()) {
149 const FrameBounds& frame_bounds = frame->GetFrameBounds(bounds_offset);
150 bounds_offset++;
151 auto atlas_glyph_bounds = frame_bounds.atlas_bounds;
152 auto glyph_bounds = frame_bounds.glyph_bounds;
153
154 // If frame_bounds.is_placeholder is true, this is the first frame
155 // the glyph has been rendered and so its atlas position was not
156 // known when the glyph was recorded. Perform a slow lookup into the
157 // glyph atlas hash table.
158 if (frame_bounds.is_placeholder) {
159 if (!font_atlas) {
160 font_atlas =
161 atlas->GetOrCreateFontGlyphAtlas(ScaledFont{font, rounded_scale});
162 }
163
164 if (!font_atlas) {
165 VALIDATION_LOG << "Could not find font in the atlas.";
166 continue;
167 }
168 SubpixelPosition subpixel = TextFrame::ComputeSubpixelPosition(
169 glyph_position, font.GetAxisAlignment(), transform);
170
171 std::optional<FrameBounds> maybe_atlas_glyph_bounds =
172 font_atlas->FindGlyphBounds(SubpixelGlyph{
173 glyph_position.glyph, //
174 subpixel, //
175 glyph_properties //
176 });
177 if (!maybe_atlas_glyph_bounds.has_value()) {
178 VALIDATION_LOG << "Could not find glyph position in the atlas.";
179 continue;
180 }
181 atlas_glyph_bounds = maybe_atlas_glyph_bounds.value().atlas_bounds;
182 }
183
184 Rect scaled_bounds = glyph_bounds.Scale(inverted_rounded_scale);
185 // For each glyph, we compute two rectangles. One for the vertex
186 // positions and one for the texture coordinates (UVs). The atlas
187 // glyph bounds are used to compute UVs in cases where the
188 // destination and source sizes may differ due to clamping the sizes
189 // of large glyphs.
190 Point uv_origin = atlas_glyph_bounds.GetLeftTop() / atlas_size;
191 Point uv_size = SizeToPoint(atlas_glyph_bounds.GetSize()) / atlas_size;
192
193 Point unrounded_glyph_position =
194 // This is for RTL text.
195 unscaled_basis * glyph_bounds.GetLeftTop() +
196 (basis_transform * glyph_position.position);
197
198 Point screen_glyph_position =
199 (screen_offset + unrounded_glyph_position + subpixel_adjustment)
200 .Floor();
201 for (const Point& point : unit_points) {
202 Point position;
203 if (is_translation_scale) {
204 position = (screen_glyph_position +
205 (unscaled_basis * point * glyph_bounds.GetSize()))
206 .Round();
207 } else {
208 position = entity_transform *
209 (glyph_position.position + scaled_bounds.GetLeftTop() +
210 point * scaled_bounds.GetSize());
211 }
212 vtx.uv = uv_origin + (uv_size * point);
213 vtx.position = position;
214 vtx_contents[i++] = vtx;
215 }
216 }
217 }
218 }
219
220 bool TextContents::Render(const ContentContext& renderer,
221 const Entity& entity,
222 RenderPass& pass) const {
223 Color color = GetColor();
224 if (color.IsTransparent()) {
225 return true;
226 }
227
228 GlyphAtlas::Type type = frame_->GetAtlasType();
229 const std::shared_ptr<GlyphAtlas>& atlas =
230 renderer.GetLazyGlyphAtlas()->CreateOrGetGlyphAtlas(
231 *renderer.GetContext(), renderer.GetTransientsBuffer(), type);
232
233 if (!atlas || !atlas->IsValid()) {
234 VALIDATION_LOG << "Cannot render glyphs without prepared atlas.";
235 return false;
236 }
237 if (!frame_->IsFrameComplete()) {
238 VALIDATION_LOG << "Failed to find font glyph bounds.";
239 return false;
240 }
241
242 // Information shared by all glyph draw calls.
243 pass.SetCommandLabel("TextFrame");
244 auto opts = OptionsFromPassAndEntity(pass, entity);
245 opts.primitive_type = PrimitiveType::kTriangle;
246 pass.SetPipeline(renderer.GetGlyphAtlasPipeline(opts));
247
248 // Common vertex uniforms for all glyphs.
249 VS::FrameInfo frame_info;
250 frame_info.mvp =
251 Entity::GetShaderTransform(entity.GetShaderClipDepth(), pass, Matrix());
252 bool is_translation_scale = entity.GetTransform().IsTranslationScaleOnly();
253 Matrix entity_transform = entity.GetTransform();
254
255 VS::BindFrameInfo(pass,
256 renderer.GetTransientsBuffer().EmplaceUniform(frame_info));
257
258 FS::FragInfo frag_info;
259 frag_info.use_text_color = force_text_color_ ? 1.0 : 0.0;
260 frag_info.text_color = ToVector(color.Premultiply());
261 frag_info.is_color_glyph = type == GlyphAtlas::Type::kColorBitmap;
262
263 FS::BindFragInfo(pass,
264 renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
265
266 SamplerDescriptor sampler_desc;
267 if (is_translation_scale) {
268 sampler_desc.min_filter = MinMagFilter::kNearest;
269 sampler_desc.mag_filter = MinMagFilter::kNearest;
270 } else {
271 // Currently, we only propagate the scale of the transform to the atlas
272 // renderer, so if the transform has more than just a translation, we turn
273 // on linear sampling to prevent crunchiness caused by the pixel grid not
274 // being perfectly aligned.
275 // The downside is that this slightly over-blurs rotated/skewed text.
276 sampler_desc.min_filter = MinMagFilter::kLinear;
277 sampler_desc.mag_filter = MinMagFilter::kLinear;
278 }
279
280 // No mipmaps for glyph atlas (glyphs are generated at exact scales).
281 sampler_desc.mip_filter = MipFilter::kBase;
282
283 FS::BindGlyphAtlasSampler(
284 pass, // command
285 atlas->GetTexture(), // texture
286 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
287 sampler_desc) // sampler
288 );
289
290 HostBuffer& host_buffer = renderer.GetTransientsBuffer();
291 size_t glyph_count = 0;
292 for (const auto& run : frame_->GetRuns()) {
293 glyph_count += run.GetGlyphPositions().size();
294 }
295 size_t vertex_count = glyph_count * 4;
296 size_t index_count = glyph_count * 6;
297
298 BufferView buffer_view = host_buffer.Emplace(
299 vertex_count * sizeof(VS::PerVertexData), alignof(VS::PerVertexData),
300 [&](uint8_t* data) {
301 VS::PerVertexData* vtx_contents =
302 reinterpret_cast<VS::PerVertexData*>(data);
303 ComputeVertexData(/*vtx_contents=*/vtx_contents,
304 /*frame=*/frame_,
305 /*scale=*/scale_,
306 /*entity_transform=*/entity_transform,
307 /*offset=*/offset_,
308 /*glyph_properties=*/GetGlyphProperties(),
309 /*atlas=*/atlas);
310 });
311 BufferView index_buffer_view = host_buffer.Emplace(
312 index_count * sizeof(uint16_t), alignof(uint16_t), [&](uint8_t* data) {
313 uint16_t* indices = reinterpret_cast<uint16_t*>(data);
314 size_t j = 0;
315 for (auto i = 0u; i < glyph_count; i++) {
316 size_t base = i * 4;
317 indices[j++] = base + 0;
318 indices[j++] = base + 1;
319 indices[j++] = base + 2;
320 indices[j++] = base + 1;
321 indices[j++] = base + 2;
322 indices[j++] = base + 3;
323 }
324 });
325
326 pass.SetVertexBuffer(std::move(buffer_view));
327 pass.SetIndexBuffer(index_buffer_view, IndexType::k16bit);
328 pass.SetElementCount(index_count);
329
330 return pass.Draw().ok();
331 }
332
333 std::optional<GlyphProperties> TextContents::GetGlyphProperties() const {
334 return (properties_.stroke || frame_->HasColor())
335 ? std::optional<GlyphProperties>(properties_)
336 : std::nullopt;
337 }
338
339 } // namespace impeller
type
GLenum type
Definition: blit_command_gles.cc:153
buffer_view
BufferView buffer_view
Definition: blit_command_gles.cc:154
buffer_view.h
impeller::ContentContext
Definition: content_context.h:138
impeller::ContentContext::GetTransientsBuffer
HostBuffer & GetTransientsBuffer() const
Retrieve the currnent host buffer for transient storage.
Definition: content_context.h:297
impeller::ContentContext::GetLazyGlyphAtlas
const std::shared_ptr< LazyGlyphAtlas > & GetLazyGlyphAtlas() const
Definition: content_context.h:265
impeller::ContentContext::GetGlyphAtlasPipeline
PipelineRef GetGlyphAtlasPipeline(ContentContextOptions opts) const
Definition: content_context.cc:1157
impeller::ContentContext::GetContext
std::shared_ptr< Context > GetContext() const
Definition: content_context.cc:939
impeller::Entity
Definition: entity.h:26
impeller::Entity::GetShaderTransform
Matrix GetShaderTransform(const RenderPass &pass) const
Definition: entity.cc:48
impeller::Entity::GetTransform
const Matrix & GetTransform() const
Get the global transform matrix for this Entity.
Definition: entity.cc:44
impeller::Entity::GetShaderClipDepth
float GetShaderClipDepth() const
Definition: entity.cc:88
impeller::FontGlyphAtlas
An object that can look up glyph locations within the GlyphAtlas for a particular typeface.
Definition: glyph_atlas.h:229
impeller::FontGlyphAtlas::FindGlyphBounds
std::optional< FrameBounds > FindGlyphBounds(const SubpixelGlyph &glyph) const
Find the location of a glyph in the atlas.
Definition: glyph_atlas.cc:131
impeller::Font
Describes a typeface along with any modifications to its intrinsic properties.
Definition: font.h:35
impeller::Font::GetAxisAlignment
AxisAlignment GetAxisAlignment() const
Definition: font.cc:41
impeller::GlyphAtlas::Type
Type
Describes how the glyphs are represented in the texture.
Definition: glyph_atlas.h:41
impeller::GlyphAtlas::Type::kColorBitmap
@ kColorBitmap
impeller::HostBuffer
Definition: host_buffer.h:26
impeller::HostBuffer::Emplace
BufferView Emplace(const BufferType &buffer, size_t alignment=0)
Emplace non-uniform data (like contiguous vertices) onto the host buffer.
Definition: host_buffer.h:92
impeller::HostBuffer::EmplaceUniform
BufferView EmplaceUniform(const UniformType &uniform)
Emplace uniform data onto the host buffer. Ensure that backend specific uniform alignment requirement...
Definition: host_buffer.h:47
impeller::Rational
Definition: rational.h:13
impeller::Rational::Invert
Rational Invert() const
Definition: rational.cc:50
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:30
impeller::RenderPass::SetVertexBuffer
virtual bool SetVertexBuffer(VertexBuffer buffer)
Specify the vertex and index buffer to use for this command.
Definition: render_pass.cc:127
impeller::RenderPass::SetIndexBuffer
virtual bool SetIndexBuffer(BufferView index_buffer, IndexType index_type)
Specify an index buffer to use for this command. To unset the index buffer, pass IndexType::kNone to ...
Definition: render_pass.cc:164
impeller::RenderPass::SetPipeline
virtual void SetPipeline(PipelineRef pipeline)
The pipeline to use for this command.
Definition: render_pass.cc:86
impeller::RenderPass::Draw
virtual fml::Status Draw()
Record the currently pending command.
Definition: render_pass.cc:208
impeller::RenderPass::SetElementCount
virtual void SetElementCount(size_t count)
Definition: render_pass.cc:119
impeller::RenderPass::SetCommandLabel
virtual void SetCommandLabel(std::string_view label)
The debugging label to use for the command.
Definition: render_pass.cc:97
impeller::RenderPipelineHandle::VertexShader
VertexShader_ VertexShader
Definition: pipeline.h:163
impeller::RenderPipelineHandle::FragmentShader
FragmentShader_ FragmentShader
Definition: pipeline.h:164
impeller::TextContents::~TextContents
~TextContents()
impeller::TextContents::SetOffset
void SetOffset(Vector2 offset)
Definition: text_contents.cc:48
impeller::TextContents::SetInheritedOpacity
void SetInheritedOpacity(Scalar opacity) override
Inherit the provided opacity.
Definition: text_contents.cc:44
impeller::TextContents::SetForceTextColor
void SetForceTextColor(bool value)
Force the text color to apply to the rendered glyphs, even if those glyphs are bitmaps.
Definition: text_contents.cc:52
impeller::TextContents::SetTextProperties
void SetTextProperties(Color color, const std::optional< StrokeParameters > &stroke)
Must be set after text frame.
Definition: text_contents.cc:60
impeller::TextContents::Render
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Definition: text_contents.cc:220
impeller::TextContents::GetCoverage
std::optional< Rect > GetCoverage(const Entity &entity) const override
Get the area of the render pass that will be affected when this contents is rendered.
Definition: text_contents.cc:56
impeller::TextContents::SetTextFrame
void SetTextFrame(const std::shared_ptr< TextFrame > &frame)
Definition: text_contents.cc:32
impeller::TextContents::SetColor
void SetColor(Color color)
Definition: text_contents.cc:36
impeller::TextContents::TextContents
TextContents()
impeller::TextContents::ComputeVertexData
static void ComputeVertexData(GlyphAtlasPipeline::VertexShader::PerVertexData *vtx_contents, const std::shared_ptr< TextFrame > &frame, Scalar scale, const Matrix &entity_transform, Vector2 offset, std::optional< GlyphProperties > glyph_properties, const std::shared_ptr< GlyphAtlas > &atlas)
Definition: text_contents.cc:87
impeller::TextContents::GetColor
Color GetColor() const
Definition: text_contents.cc:40
impeller::TextFrame::ComputeSubpixelPosition
static SubpixelPosition ComputeSubpixelPosition(const TextRun::GlyphPosition &glyph_position, AxisAlignment alignment, const Matrix &transform)
Definition: text_frame.cc:94
impeller::TextRun
Represents a collection of positioned glyphs from a specific font.
Definition: text_run.h:20
color.h
formats.h
value
int32_t value
Definition: dl_golden_unittests.cc:459
x
int32_t x
Definition: dl_golden_unittests.cc:458
entity.h
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214
glyph_atlas.h
impeller
Definition: allocation.cc:12
impeller::PrimitiveType::kTriangle
@ kTriangle
impeller::Scalar
float Scalar
Definition: scalar.h:19
impeller::IndexType::k16bit
@ k16bit
impeller::Point
TPoint< Scalar > Point
Definition: point.h:327
impeller::FS
LinePipeline::FragmentShader FS
Definition: line_contents.cc:14
impeller::AxisAlignment::kX
@ kX
impeller::AxisAlignment::kAll
@ kAll
impeller::AxisAlignment::kNone
@ kNone
impeller::AxisAlignment::kY
@ kY
impeller::MipFilter::kBase
@ kBase
The texture is sampled as if it only had a single mipmap level.
impeller::SizeToPoint
Point SizeToPoint(Size size)
Definition: text_contents.cc:21
impeller::ToVector
constexpr Vector4 ToVector(Color color)
Definition: shader_types.h:190
impeller::VS
LinePipeline::VertexShader VS
Definition: line_contents.cc:13
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:34
impeller::SubpixelPosition
SubpixelPosition
Definition: font_glyph_pair.h:56
impeller::MinMagFilter::kLinear
@ kLinear
impeller::MinMagFilter::kNearest
@ kNearest
Select nearest to the sample point. Most widely supported.
std
Definition: comparable.h:95
point.h
render_pass.h
sampler_descriptor.h
impeller::BufferView
Definition: buffer_view.h:19
impeller::Color
Definition: color.h:124
impeller::Color::alpha
Scalar alpha
Definition: color.h:143
impeller::Color::IsTransparent
constexpr bool IsTransparent() const
Definition: color.h:892
impeller::Color::WithAlpha
constexpr Color WithAlpha(Scalar new_alpha) const
Definition: color.h:278
impeller::Color::Premultiply
constexpr Color Premultiply() const
Definition: color.h:212
impeller::FrameBounds
Definition: glyph_atlas.h:22
impeller::FrameBounds::atlas_bounds
Rect atlas_bounds
The bounds of the glyph within the glyph atlas.
Definition: glyph_atlas.h:24
impeller::FrameBounds::glyph_bounds
Rect glyph_bounds
The local glyph bounds.
Definition: glyph_atlas.h:26
impeller::FrameBounds::is_placeholder
bool is_placeholder
Definition: glyph_atlas.h:29
impeller::GlyphProperties::color
Color color
Definition: font_glyph_pair.h:20
impeller::GlyphProperties::stroke
std::optional< StrokeParameters > stroke
Definition: font_glyph_pair.h:21
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::Matrix::IsTranslationScaleOnly
constexpr bool IsTranslationScaleOnly() const
Returns true if the matrix has a scale-only basis and is non-projective. Note that an identity matrix...
Definition: matrix.h:493
impeller::Matrix::m
Scalar m[16]
Definition: matrix.h:39
impeller::Matrix::Basis
constexpr Matrix Basis() const
The Matrix without its w components (without translation).
Definition: matrix.h:239
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:104
impeller::SamplerDescriptor
Definition: sampler_descriptor.h:14
impeller::SamplerDescriptor::mip_filter
MipFilter mip_filter
Definition: sampler_descriptor.h:17
impeller::SamplerDescriptor::mag_filter
MinMagFilter mag_filter
Definition: sampler_descriptor.h:16
impeller::SamplerDescriptor::min_filter
MinMagFilter min_filter
Definition: sampler_descriptor.h:15
impeller::ScaledFont
A font and a scale. Used as a key that represents a typeface within a glyph atlas.
Definition: font_glyph_pair.h:36
impeller::SubpixelGlyph
A glyph and its subpixel position.
Definition: font_glyph_pair.h:85
impeller::SubpixelGlyph::glyph
Glyph glyph
Definition: font_glyph_pair.h:86
impeller::TPoint< Scalar >
impeller::TPoint::Round
static constexpr TPoint Round(const TPoint< U > &other)
Definition: point.h:49
impeller::TPoint::y
Type y
Definition: point.h:31
impeller::TPoint::x
Type x
Definition: point.h:30
impeller::TRect< Scalar >
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::Scale
constexpr TRect Scale(Type scale) const
Definition: rect.h:206
impeller::TRect::GetLeftTop
constexpr TPoint< T > GetLeftTop() const
Definition: rect.h:363
impeller::TSize< Scalar >
impeller::TSize::height
Type height
Definition: size.h:29
impeller::TSize::width
Type width
Definition: size.h:28
impeller::TextRun::GlyphPosition
Definition: text_run.h:22
text_contents.h
data
std::shared_ptr< const fml::Mapping > data
Definition: texture_gles.cc:68
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:91