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LibWeb: Paint 1x1 backgrounds as color fill instead of tiling bitmap

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This yields a huge speedup on pages that use this weird but
not-entirely-uncommon technique.
This commit is contained in:
Andreas Kling 2024-01-01 13:48:53 +01:00
parent e8f04be3ae
commit 6eeda29642
4 changed files with 47 additions and 14 deletions
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2
Userland/Libraries/LibWeb/CSS/StyleValues/AbstractImageStyleValue.h
View file

@ -37,6 +37,8 @@ public:
virtual bool is_paintable() const = 0;
virtual void paint(PaintContext& context, DevicePixelRect const& dest_rect, ImageRendering) const = 0;
virtual Optional<Gfx::Color> color_if_single_pixel_bitmap() const { return {}; }
};
// And now, some gradient related things. Maybe these should live somewhere else.

9
Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
View file

@ -146,4 +146,13 @@ JS::GCPtr<HTML::DecodedImageData> ImageStyleValue::image_data() const
return m_image_request->image_data();
}
Optional<Gfx::Color> ImageStyleValue::color_if_single_pixel_bitmap() const
{
if (auto const* b = bitmap(m_current_frame_index)) {
if (b->width() == 1 && b->height() == 1)
return b->bitmap().get_pixel(0, 0);
}
return {};
}
}

2
Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.h
View file

@ -47,6 +47,8 @@ public:
virtual bool is_paintable() const override;
void paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering) const override;
virtual Optional<Gfx::Color> color_if_single_pixel_bitmap() const override;
Function<void()> on_animate;
JS::GCPtr<HTML::DecodedImageData> image_data() const;

48
Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
View file

@ -355,24 +355,44 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
image.resolve_for_size(layout_node, image_rect.size());
while (image_y < css_clip_rect.bottom()) {
image_rect.set_y(image_y);
auto for_each_image_device_rect = [&](auto callback) {
while (image_y < css_clip_rect.bottom()) {
image_rect.set_y(image_y);
auto image_x = initial_image_x;
while (image_x < css_clip_rect.right()) {
image_rect.set_x(image_x);
auto image_device_rect = context.rounded_device_rect(image_rect);
if (image_device_rect != last_image_device_rect)
image.paint(context, image_device_rect, image_rendering);
last_image_device_rect = image_device_rect;
if (!repeat_x)
auto image_x = initial_image_x;
while (image_x < css_clip_rect.right()) {
image_rect.set_x(image_x);
auto image_device_rect = context.rounded_device_rect(image_rect);
callback(image_device_rect);
if (!repeat_x)
break;
image_x += x_step;
}
if (!repeat_y)
break;
image_x += x_step;
image_y += y_step;
}
};
if (!repeat_y)
break;
image_y += y_step;
if (auto color = image.color_if_single_pixel_bitmap(); color.has_value()) {
// OPTIMIZATION: If the image is a single pixel, we can just fill the whole area with it.
// However, we must first figure out the real coverage area, taking repeat etc into account.
// FIXME: This could be written in a far more efficient way.
auto fill_rect = Optional<DevicePixelRect> {};
for_each_image_device_rect([&](auto const& image_device_rect) {
if (!fill_rect.has_value()) {
fill_rect = image_device_rect;
} else {
fill_rect = fill_rect->united(image_device_rect);
}
});
painter.fill_rect(fill_rect->to_type<int>(), color.value());
} else {
for_each_image_device_rect([&](auto const& image_device_rect) {
image.paint(context, image_device_rect, image_rendering);
});
}
}
}