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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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5
Userland/Libraries/LibAccelGfx/Painter.h
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@ -29,6 +29,7 @@ class Painter {
public:
static OwnPtr<Painter> create();
static OwnPtr<Painter> create_with_glyphs_texture_from_painter(Painter const& painter);
Painter(Context&);
~Painter();
@ -86,6 +87,9 @@ public:
void fill_rect_with_rounded_corners(Gfx::IntRect const& rect, Color const& color, CornerRadius const& top_left_radius, CornerRadius const& top_right_radius, CornerRadius const& bottom_left_radius, CornerRadius const& bottom_right_radius);
void fill_rect_with_rounded_corners(Gfx::FloatRect const& rect, Color const& color, CornerRadius const& top_left_radius, CornerRadius const& top_right_radius, CornerRadius const& bottom_left_radius, CornerRadius const& bottom_right_radius);
void blit_canvas(Gfx::IntRect const& dst_rect, Canvas const&, float opacity = 1.0f);
void blit_canvas(Gfx::FloatRect const& dst_rect, Canvas const&, float opacity = 1.0f);
private:
Context& m_context;
@ -96,6 +100,7 @@ private:
[[nodiscard]] State& state() { return m_state_stack.last(); }
[[nodiscard]] State const& state() const { return m_state_stack.last(); }
void blit_scaled_texture(Gfx::FloatRect const& dst_rect, GL::Texture const&, Gfx::FloatRect const& src_rect, ScalingMode, float opacity = 1.0f);
void bind_target_canvas();
[[nodiscard]] Gfx::FloatRect to_clip_space(Gfx::FloatRect const& screen_rect) const;