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LibWeb: Add fast path for CRC2D.drawImage() with simple transform

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If the transform is a simple translation, we don't need to run the big
and slow transform rasterizer.
This commit is contained in:
Andreas Kling 2022-04-11 02:29:37 +02:00
parent 57feb0f3ec
commit 88ef1bff38
1 changed files with 3 additions and 2 deletions
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5
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
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@ -182,9 +182,10 @@ DOM::ExceptionOr<void> CanvasRenderingContext2D::draw_image(CanvasImageSource co
if (!painter)
return {};
if (m_drawing_state.transform.is_identity()) {
// There's no affine transformation to worry about, we can just call Gfx::Painter.
if (m_drawing_state.transform.is_identity_or_translation()) {
painter->translate(m_drawing_state.transform.e(), m_drawing_state.transform.f());
painter->draw_scaled_bitmap(destination_rect.to_rounded<int>(), *bitmap, source_rect, 1.0f, Gfx::Painter::ScalingMode::BilinearBlend);
painter->translate(-m_drawing_state.transform.e(), -m_drawing_state.transform.f());
} else {
// The context has an affine transform, we have to draw through it!