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https://github.com/RGBCube/serenity
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LibWeb: Paint 1x1 backgrounds as color fill instead of tiling bitmap
This yields a huge speedup on pages that use this weird but not-entirely-uncommon technique.
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parent
e8f04be3ae
commit
6eeda29642
4 changed files with 47 additions and 14 deletions
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@ -37,6 +37,8 @@ public:
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virtual bool is_paintable() const = 0;
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virtual void paint(PaintContext& context, DevicePixelRect const& dest_rect, ImageRendering) const = 0;
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virtual Optional<Gfx::Color> color_if_single_pixel_bitmap() const { return {}; }
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};
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// And now, some gradient related things. Maybe these should live somewhere else.
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@ -146,4 +146,13 @@ JS::GCPtr<HTML::DecodedImageData> ImageStyleValue::image_data() const
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return m_image_request->image_data();
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}
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Optional<Gfx::Color> ImageStyleValue::color_if_single_pixel_bitmap() const
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{
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if (auto const* b = bitmap(m_current_frame_index)) {
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if (b->width() == 1 && b->height() == 1)
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return b->bitmap().get_pixel(0, 0);
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}
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return {};
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}
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}
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@ -47,6 +47,8 @@ public:
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virtual bool is_paintable() const override;
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void paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering) const override;
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virtual Optional<Gfx::Color> color_if_single_pixel_bitmap() const override;
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Function<void()> on_animate;
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JS::GCPtr<HTML::DecodedImageData> image_data() const;
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@ -355,6 +355,7 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
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image.resolve_for_size(layout_node, image_rect.size());
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auto for_each_image_device_rect = [&](auto callback) {
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while (image_y < css_clip_rect.bottom()) {
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image_rect.set_y(image_y);
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@ -362,9 +363,7 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
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while (image_x < css_clip_rect.right()) {
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image_rect.set_x(image_x);
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auto image_device_rect = context.rounded_device_rect(image_rect);
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if (image_device_rect != last_image_device_rect)
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image.paint(context, image_device_rect, image_rendering);
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last_image_device_rect = image_device_rect;
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callback(image_device_rect);
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if (!repeat_x)
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break;
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image_x += x_step;
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@ -374,6 +373,27 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
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break;
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image_y += y_step;
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}
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};
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if (auto color = image.color_if_single_pixel_bitmap(); color.has_value()) {
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// OPTIMIZATION: If the image is a single pixel, we can just fill the whole area with it.
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// However, we must first figure out the real coverage area, taking repeat etc into account.
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// FIXME: This could be written in a far more efficient way.
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auto fill_rect = Optional<DevicePixelRect> {};
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for_each_image_device_rect([&](auto const& image_device_rect) {
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if (!fill_rect.has_value()) {
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fill_rect = image_device_rect;
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} else {
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fill_rect = fill_rect->united(image_device_rect);
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}
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});
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painter.fill_rect(fill_rect->to_type<int>(), color.value());
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} else {
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for_each_image_device_rect([&](auto const& image_device_rect) {
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image.paint(context, image_device_rect, image_rendering);
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});
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}
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}
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}
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