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LibAccelGfx+LibWeb: Add support for stacking context opacity

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For each stacking context with an opacity less than 1, we create a
separate framebuffer. We then blit the texture attached to this
framebuffer with the specified opacity.

To avoid the performance overhead of reading pixels from the texture
into Gfx::Bitmap, a new method that allows for direct blitting from
the texture is introduced, named blit_scaled_texture().
This commit is contained in:
Aliaksandr Kalenik 2023-11-23 15:28:51 +01:00 • committed by Andreas Kling
parent cb90daadc7
commit 5f7ac559a7
8 changed files with 133 additions and 74 deletions
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39
Userland/Libraries/LibWeb/Painting/PaintingCommandExecutorGPU.cpp
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@ -8,13 +8,22 @@
namespace Web::Painting {
PaintingCommandExecutorGPU::PaintingCommandExecutorGPU(AccelGfx::Painter& painter)
: m_painter(painter)
PaintingCommandExecutorGPU::PaintingCommandExecutorGPU(Gfx::Bitmap& bitmap)
: m_target_bitmap(bitmap)
{
auto painter = AccelGfx::Painter::create();
auto canvas = AccelGfx::Canvas::create(bitmap.size());
painter->set_target_canvas(canvas);
stacking_contexts.append({ .canvas = canvas,
.painter = move(painter),
.opacity = 1.0f,
.destination = {} });
}
PaintingCommandExecutorGPU::~PaintingCommandExecutorGPU()
{
VERIFY(stacking_contexts.size() == 1);
painter().flush(m_target_bitmap);
}
CommandResult PaintingCommandExecutorGPU::draw_glyph_run(Vector<Gfx::DrawGlyphOrEmoji> const& glyph_run, Color const& color)
@ -75,16 +84,32 @@ CommandResult PaintingCommandExecutorGPU::set_font(Gfx::Font const&)
return CommandResult::Continue;
}
CommandResult PaintingCommandExecutorGPU::push_stacking_context(float, bool, Gfx::IntRect const&, Gfx::IntPoint post_transform_translation, CSS::ImageRendering, StackingContextTransform, Optional<StackingContextMask>)
CommandResult PaintingCommandExecutorGPU::push_stacking_context(float opacity, bool, Gfx::IntRect const& source_paintable_rect, Gfx::IntPoint post_transform_translation, CSS::ImageRendering, StackingContextTransform, Optional<StackingContextMask>)
{
painter().save();
painter().translate(post_transform_translation.to_type<float>());
if (opacity < 1) {
auto painter = AccelGfx::Painter::create_with_glyphs_texture_from_painter(this->painter());
auto canvas = AccelGfx::Canvas::create(source_paintable_rect.size());
painter->set_target_canvas(canvas);
painter->translate(-source_paintable_rect.location().to_type<float>());
stacking_contexts.append({ .canvas = canvas,
.painter = move(painter),
.opacity = opacity,
.destination = source_paintable_rect });
} else {
painter().save();
painter().translate(post_transform_translation.to_type<float>());
}
return CommandResult::Continue;
}
CommandResult PaintingCommandExecutorGPU::pop_stacking_context()
{
painter().restore();
if (stacking_contexts.last().opacity < 1) {
auto stacking_context = stacking_contexts.take_last();
painter().blit_canvas(stacking_context.destination, *stacking_context.canvas, stacking_context.opacity);
} else {
painter().restore();
}
return CommandResult::Continue;
}
@ -283,7 +308,7 @@ bool PaintingCommandExecutorGPU::would_be_fully_clipped_by_painter(Gfx::IntRect)
void PaintingCommandExecutorGPU::prepare_glyph_texture(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs)
{
m_painter.prepare_glyph_texture(unique_glyphs);
painter().prepare_glyph_texture(unique_glyphs);
}
}