[Impeller] hash less text stuff per frame for text rendering. (flutter/engine#55060)
The Glyph color and stroke property are only required for stroked text or COLR text, in all other cases its a no-op. We can do the text hashing faster if we let these properties be optional. ~Also as an experiment switches to absl containers which should be more reasonably performant than std containers.~ required more changes, will try again later
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@ -222,8 +222,11 @@ bool TextContents::Render(const ContentContext& renderer,
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Point subpixel = TextFrame::ComputeSubpixelPosition(
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glyph_position, font.GetAxisAlignment(), offset_, scale_);
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std::optional<std::pair<Rect, Rect>> maybe_atlas_glyph_bounds =
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font_atlas->FindGlyphBounds(
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SubpixelGlyph{glyph_position.glyph, subpixel, properties_});
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font_atlas->FindGlyphBounds(SubpixelGlyph{
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glyph_position.glyph, subpixel,
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(properties_.stroke || frame_->HasColor())
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? std::optional<GlyphProperties>(properties_)
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: std::nullopt});
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if (!maybe_atlas_glyph_bounds.has_value()) {
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VALIDATION_LOG << "Could not find glyph position in the atlas.";
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continue;
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@ -208,7 +208,7 @@ static void DrawGlyph(SkCanvas* canvas,
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const ScaledFont& scaled_font,
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const SubpixelGlyph& glyph,
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const Rect& scaled_bounds,
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const GlyphProperties& prop,
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const std::optional<GlyphProperties>& prop,
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bool has_color) {
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const auto& metrics = scaled_font.font.GetMetrics();
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SkGlyphID glyph_id = glyph.glyph.index;
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@ -222,18 +222,17 @@ static void DrawGlyph(SkCanvas* canvas,
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sk_font.setSubpixel(true);
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sk_font.setSize(sk_font.getSize() * scaled_font.scale);
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auto glyph_color =
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has_color ? glyph.properties.color.ToARGB() : SK_ColorBLACK;
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auto glyph_color = prop.has_value() ? prop->color.ToARGB() : SK_ColorBLACK;
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SkPaint glyph_paint;
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glyph_paint.setColor(glyph_color);
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glyph_paint.setBlendMode(SkBlendMode::kSrc);
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if (prop.stroke) {
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if (prop.has_value() && prop->stroke) {
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glyph_paint.setStroke(true);
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glyph_paint.setStrokeWidth(prop.stroke_width * scaled_font.scale);
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glyph_paint.setStrokeCap(ToSkiaCap(glyph.properties.stroke_cap));
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glyph_paint.setStrokeJoin(ToSkiaJoin(glyph.properties.stroke_join));
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glyph_paint.setStrokeMiter(prop.stroke_miter * scaled_font.scale);
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glyph_paint.setStrokeWidth(prop->stroke_width * scaled_font.scale);
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glyph_paint.setStrokeCap(ToSkiaCap(prop->stroke_cap));
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glyph_paint.setStrokeJoin(ToSkiaJoin(prop->stroke_join));
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glyph_paint.setStrokeMiter(prop->stroke_miter * scaled_font.scale);
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}
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canvas->save();
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canvas->translate(glyph.subpixel_offset.x, glyph.subpixel_offset.y);
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@ -384,12 +383,12 @@ static Rect ComputeGlyphSize(const SkFont& font,
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Scalar scale) {
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SkRect scaled_bounds;
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SkPaint glyph_paint;
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if (glyph.properties.stroke) {
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if (glyph.properties.has_value() && glyph.properties->stroke) {
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glyph_paint.setStroke(true);
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glyph_paint.setStrokeWidth(glyph.properties.stroke_width * scale);
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glyph_paint.setStrokeCap(ToSkiaCap(glyph.properties.stroke_cap));
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glyph_paint.setStrokeJoin(ToSkiaJoin(glyph.properties.stroke_join));
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glyph_paint.setStrokeMiter(glyph.properties.stroke_miter * scale);
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glyph_paint.setStrokeWidth(glyph.properties->stroke_width * scale);
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glyph_paint.setStrokeCap(ToSkiaCap(glyph.properties->stroke_cap));
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glyph_paint.setStrokeJoin(ToSkiaJoin(glyph.properties->stroke_join));
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glyph_paint.setStrokeMiter(glyph.properties->stroke_miter * scale);
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}
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font.getBounds(&glyph.glyph.index, 1, &scaled_bounds, &glyph_paint);
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@ -8,6 +8,7 @@
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#include <unordered_map>
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#include <unordered_set>
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#include "fml/hash_combine.h"
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#include "impeller/geometry/color.h"
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#include "impeller/geometry/path.h"
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#include "impeller/geometry/point.h"
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@ -32,6 +33,19 @@ struct GlyphProperties {
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struct ScaledFont {
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Font font;
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Scalar scale;
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struct Hash {
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constexpr std::size_t operator()(const impeller::ScaledFont& sf) const {
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return fml::HashCombine(sf.font.GetHash(), sf.scale);
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}
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};
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struct Equal {
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constexpr bool operator()(const impeller::ScaledFont& lhs,
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const impeller::ScaledFont& rhs) const {
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return lhs.font.IsEqual(rhs.font) && lhs.scale == rhs.scale;
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}
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};
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};
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//------------------------------------------------------------------------------
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@ -40,18 +54,58 @@ struct ScaledFont {
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struct SubpixelGlyph {
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Glyph glyph;
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Point subpixel_offset;
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GlyphProperties properties;
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std::optional<GlyphProperties> properties;
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SubpixelGlyph(Glyph p_glyph,
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Point p_subpixel_offset,
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GlyphProperties p_properties)
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std::optional<GlyphProperties> p_properties)
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: glyph(p_glyph),
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subpixel_offset(p_subpixel_offset),
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properties(p_properties) {}
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struct Hash {
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constexpr std::size_t operator()(const impeller::SubpixelGlyph& sg) const {
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if (!sg.properties.has_value()) {
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return fml::HashCombine(sg.glyph.index, sg.subpixel_offset.x,
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sg.subpixel_offset.y);
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}
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return fml::HashCombine(
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sg.glyph.index, sg.subpixel_offset.x, sg.subpixel_offset.y,
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sg.properties->color.ToARGB(), sg.properties->stroke,
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sg.properties->stroke_cap, sg.properties->stroke_join,
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sg.properties->stroke_miter, sg.properties->stroke_width);
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}
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};
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struct Equal {
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constexpr bool operator()(const impeller::SubpixelGlyph& lhs,
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const impeller::SubpixelGlyph& rhs) const {
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if (!lhs.properties.has_value() && !rhs.properties.has_value()) {
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return lhs.glyph.index == rhs.glyph.index &&
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lhs.glyph.type == rhs.glyph.type &&
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lhs.subpixel_offset == rhs.subpixel_offset;
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}
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return lhs.glyph.index == rhs.glyph.index &&
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lhs.glyph.type == rhs.glyph.type &&
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lhs.subpixel_offset == rhs.subpixel_offset &&
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lhs.properties.has_value() && rhs.properties.has_value() &&
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lhs.properties->color.ToARGB() == rhs.properties->color.ToARGB() &&
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lhs.properties->stroke == rhs.properties->stroke &&
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lhs.properties->stroke_cap == rhs.properties->stroke_cap &&
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lhs.properties->stroke_join == rhs.properties->stroke_join &&
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lhs.properties->stroke_miter == rhs.properties->stroke_miter &&
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lhs.properties->stroke_width == rhs.properties->stroke_width;
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}
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};
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};
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using FontGlyphMap =
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std::unordered_map<ScaledFont, std::unordered_set<SubpixelGlyph>>;
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std::unordered_map<ScaledFont,
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std::unordered_set<SubpixelGlyph,
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SubpixelGlyph::Hash,
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SubpixelGlyph::Equal>,
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ScaledFont::Hash,
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ScaledFont::Equal>;
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//------------------------------------------------------------------------------
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/// @brief A font along with a glyph in that font rendered at a particular
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@ -66,46 +120,4 @@ struct FontGlyphPair {
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} // namespace impeller
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template <>
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struct std::hash<impeller::ScaledFont> {
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constexpr std::size_t operator()(const impeller::ScaledFont& sf) const {
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return fml::HashCombine(sf.font.GetHash(), sf.scale);
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}
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};
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template <>
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struct std::equal_to<impeller::ScaledFont> {
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constexpr bool operator()(const impeller::ScaledFont& lhs,
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const impeller::ScaledFont& rhs) const {
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return lhs.font.IsEqual(rhs.font) && lhs.scale == rhs.scale;
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}
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};
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template <>
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struct std::hash<impeller::SubpixelGlyph> {
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constexpr std::size_t operator()(const impeller::SubpixelGlyph& sg) const {
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return fml::HashCombine(
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sg.glyph.index, sg.subpixel_offset.x, sg.subpixel_offset.y,
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sg.properties.color.ToARGB(), sg.properties.stroke,
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sg.properties.stroke_cap, sg.properties.stroke_join,
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sg.properties.stroke_miter, sg.properties.stroke_width);
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}
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};
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template <>
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struct std::equal_to<impeller::SubpixelGlyph> {
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constexpr bool operator()(const impeller::SubpixelGlyph& lhs,
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const impeller::SubpixelGlyph& rhs) const {
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return lhs.glyph.index == rhs.glyph.index &&
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lhs.glyph.type == rhs.glyph.type &&
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lhs.subpixel_offset == rhs.subpixel_offset &&
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lhs.properties.color.ToARGB() == rhs.properties.color.ToARGB() &&
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lhs.properties.stroke == rhs.properties.stroke &&
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lhs.properties.stroke_cap == rhs.properties.stroke_cap &&
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lhs.properties.stroke_join == rhs.properties.stroke_join &&
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lhs.properties.stroke_miter == rhs.properties.stroke_miter &&
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lhs.properties.stroke_width == rhs.properties.stroke_width;
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}
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};
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#endif // FLUTTER_IMPELLER_TYPOGRAPHER_FONT_GLYPH_PAIR_H_
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@ -136,7 +136,11 @@ class GlyphAtlas {
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const Type type_;
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std::shared_ptr<Texture> texture_;
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std::unordered_map<ScaledFont, FontGlyphAtlas> font_atlas_map_;
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std::unordered_map<ScaledFont,
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FontGlyphAtlas,
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ScaledFont::Hash,
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ScaledFont::Equal>
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font_atlas_map_;
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GlyphAtlas(const GlyphAtlas&) = delete;
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@ -214,7 +218,11 @@ class FontGlyphAtlas {
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private:
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friend class GlyphAtlas;
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std::unordered_map<SubpixelGlyph, std::pair<Rect, Rect>> positions_;
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std::unordered_map<SubpixelGlyph,
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std::pair<Rect, Rect>,
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SubpixelGlyph::Hash,
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SubpixelGlyph::Equal>
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positions_;
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FontGlyphAtlas(const FontGlyphAtlas&) = delete;
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@ -89,6 +89,10 @@ void TextFrame::CollectUniqueFontGlyphPairs(
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Scalar scale,
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Point offset,
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const GlyphProperties& properties) const {
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std::optional<GlyphProperties> lookup =
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(properties.stroke || HasColor())
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? std::optional<GlyphProperties>(properties)
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: std::nullopt;
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for (const TextRun& run : GetRuns()) {
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const Font& font = run.GetFont();
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auto rounded_scale =
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@ -98,7 +102,7 @@ void TextFrame::CollectUniqueFontGlyphPairs(
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run.GetGlyphPositions()) {
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Point subpixel = ComputeSubpixelPosition(
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glyph_position, font.GetAxisAlignment(), offset, scale);
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set.emplace(glyph_position.glyph, subpixel, properties);
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set.emplace(glyph_position.glyph, subpixel, lookup);
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}
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}
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}
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@ -7,7 +7,7 @@
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#include <vector>
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#include "impeller/geometry/matrix.h"
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#include "impeller/geometry/point.h"
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#include "impeller/typographer/font.h"
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#include "impeller/typographer/glyph.h"
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