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LibWeb: Only paint the background image on integer steps

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This avoids excessive over painting.
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MacDue 2022-06-17 00:24:30 +01:00 • committed by Linus Groh
parent c4ef4fcd72
commit c491ab7523
1 changed files with 6 additions and 1 deletions
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7
Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
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@ -261,13 +261,18 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
float initial_image_x = image_rect.x(); float initial_image_x = image_rect.x();
float image_y = image_rect.y(); float image_y = image_rect.y();
Optional<Gfx::IntRect> last_int_image_rect;
while (image_y < clip_rect.bottom()) { while (image_y < clip_rect.bottom()) {
image_rect.set_y(image_y); image_rect.set_y(image_y);
float image_x = initial_image_x; float image_x = initial_image_x;
while (image_x < clip_rect.right()) { while (image_x < clip_rect.right()) {
image_rect.set_x(image_x); image_rect.set_x(image_x);
painter.draw_scaled_bitmap(image_rect.to_rounded<int>(), image, image.rect(), 1.0f, Gfx::Painter::ScalingMode::BilinearBlend); auto int_image_rect = image_rect.to_rounded<int>();
if (int_image_rect != last_int_image_rect)
painter.draw_scaled_bitmap(int_image_rect, image, image.rect(), 1.0f, Gfx::Painter::ScalingMode::BilinearBlend);
last_int_image_rect = int_image_rect;
if (!repeat_x) if (!repeat_x)
break; break;
image_x += x_step; image_x += x_step;