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LibAccelGfx+LibWeb: Support non-translation transforms in GPU painter

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This change introduces GPU painter support for rotate(), skew(),
scale(), and other transformations that could be applied to stacking
context.
This commit is contained in:
Aliaksandr Kalenik 2023-11-30 20:54:20 +01:00 • committed by Andreas Kling
parent 45d81dceed
commit c28f6828c9
4 changed files with 52 additions and 25 deletions
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30
Userland/Libraries/LibWeb/Painting/PaintingCommandExecutorGPU.cpp
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@ -18,7 +18,8 @@ PaintingCommandExecutorGPU::PaintingCommandExecutorGPU(Gfx::Bitmap& bitmap)
m_stacking_contexts.append({ .canvas = canvas,
.painter = move(painter),
.opacity = 1.0f,
.destination = {} });
.destination = {},
.transform = {} });
}
PaintingCommandExecutorGPU::~PaintingCommandExecutorGPU()
@ -99,29 +100,34 @@ CommandResult PaintingCommandExecutorGPU::push_stacking_context(float opacity, b
painter().translate(-translation);
}
auto affine_transform = Gfx::extract_2d_affine_transform(transform.matrix);
auto stacking_context_transform = Gfx::extract_2d_affine_transform(transform.matrix);
if (opacity < 1) {
Gfx::AffineTransform inverse_origin_translation;
inverse_origin_translation.translate(-transform.origin);
Gfx::AffineTransform origin_translation;
origin_translation.translate(transform.origin);
Gfx::AffineTransform final_transform = origin_translation;
final_transform.multiply(stacking_context_transform);
final_transform.multiply(inverse_origin_translation);
if (opacity < 1 || !stacking_context_transform.is_identity_or_translation()) {
auto painter = AccelGfx::Painter::create();
auto canvas = AccelGfx::Canvas::create(source_paintable_rect.size());
painter->set_target_canvas(canvas);
painter->translate(-source_paintable_rect.location().to_type<float>());
painter->clear(Color::Transparent);
auto source_rect = source_paintable_rect.to_type<float>().translated(-transform.origin);
auto transformed_destination_rect = affine_transform.map(source_rect).translated(transform.origin);
auto destination_rect = transformed_destination_rect.to_rounded<int>();
m_stacking_contexts.append({ .canvas = canvas,
.painter = move(painter),
.opacity = opacity,
.destination = destination_rect });
.destination = source_paintable_rect,
.transform = final_transform });
} else {
painter().translate(affine_transform.translation() + post_transform_translation.to_type<float>());
painter().translate(stacking_context_transform.translation() + post_transform_translation.to_type<float>());
m_stacking_contexts.append({ .canvas = {},
.painter = MaybeOwned(painter()),
.opacity = opacity,
.destination = {} });
.destination = {},
.transform = final_transform });
}
return CommandResult::Continue;
}
@ -131,7 +137,7 @@ CommandResult PaintingCommandExecutorGPU::pop_stacking_context()
auto stacking_context = m_stacking_contexts.take_last();
VERIFY(stacking_context.stacking_context_depth == 0);
if (stacking_context.painter.is_owned()) {
painter().blit_canvas(stacking_context.destination, *stacking_context.canvas, stacking_context.opacity);
painter().blit_canvas(stacking_context.destination, *stacking_context.canvas, stacking_context.opacity, stacking_context.transform);
}
painter().restore();
m_stacking_contexts.last().stacking_context_depth--;