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LibWeb: Flip vertically PaintingSurface attached to WebGL context

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OpenGL's origin is at the bottom-left corner, while Skia's origin is at
the top-left corner. This change adds a transformation to compensate for
this difference when rendering PaintingSurface attached to WebGL
context.
This commit is contained in:
Aliaksandr Kalenik 2024-11-30 16:52:09 +01:00 • committed by Alexander Kalenik
commit 45e0f50463
Notes: github-actions[bot] 2024-12-03 22:37:23 +00:00
3 changed files with 15 additions and 0 deletions
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10
Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp
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@ -329,7 +329,17 @@ void DisplayListPlayerSkia::draw_painting_surface(DrawPaintingSurface const& com
auto& canvas = surface().canvas();
auto image = sk_surface.makeImageSnapshot();
SkPaint paint;
if (command.surface->flip_vertically()) {
canvas.save();
SkMatrix matrix;
matrix.setIdentity();
matrix.preScale(1, -1, dst_rect.centerX(), dst_rect.centerY());
canvas.concat(matrix);
}
canvas.drawImageRect(image, src_rect, dst_rect, to_skia_sampling_options(command.scaling_mode), &paint, SkCanvas::kStrict_SrcRectConstraint);
if (command.surface->flip_vertically()) {
canvas.restore();
}
}
void DisplayListPlayerSkia::draw_scaled_immutable_bitmap(DrawScaledImmutableBitmap const& command)