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LibWeb: Do not deform bitmaps partially outside the img-box

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Instead of trying to manually determine which parts of a bitmap fall
within the box of the `<img>` element, just draw the whole bitmap and
let Skia clip the draw-area to the correct rectangle.

This fixes a bug where the entire bitmap was squashed into the rectangle
of the image box instead of being clipped.

With this change, image rendering is now correct enough to import some
of the WPT tests for object-fit and object-position. To get some good
coverage I have imported all tests for the `<img>` tag. I also wanted to
import a subset of the tests for the `<object>` tag, since those are
passing as well now. Unfortunately, they are flaky for unknown reasons.

This is the second attempt at this bugfix. The prior one was e055927ead
and broke image rendering whenever the page was scrolled. It has
subsequently been reverted in 16b14273d1. Hopefully this time it is not
horribly broken.
This commit is contained in:
InvalidUsernameException 2025-02-04 21:51:51 +01:00 • committed by Alexander Kalenik
parent 5d3b45127e
commit d76f841994
Notes: github-actions[bot] 2025-03-10 16:15:05 +00:00
36 changed files with 1758 additions and 24 deletions
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3
Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
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@ -149,7 +149,8 @@ void ImageStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_r
{
if (auto const* b = bitmap(m_current_frame_index, dest_rect.size().to_type<int>()); b != nullptr) {
auto scaling_mode = to_gfx_scaling_mode(image_rendering, b->rect(), dest_rect.to_type<int>());
context.display_list_recorder().draw_scaled_immutable_bitmap(dest_rect.to_type<int>(), *b, b->rect(), scaling_mode);
auto dest_int_rect = dest_rect.to_type<int>();
context.display_list_recorder().draw_scaled_immutable_bitmap(dest_int_rect, dest_int_rect, *b, scaling_mode);
}
}