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LibWeb: Don't draw text fragments that would be clipped by the painter

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This avoids a ton of work when painting large documents. Even though it
would eventually get clipped by the painter anyway, by bailing out
earlier, we avoid a lot more work (UTF-8 iteration, OpenType lookups,
etc).

It would be even nicer if we could skip entire line boxes, but we don't
have a fast way to get the bounding rect of a line box at the moment.
This commit is contained in:
Andreas Kling 2023-05-23 11:27:16 +02:00
parent df1bb0ff49
commit fe92b54137
3 changed files with 13 additions and 2 deletions
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6
Userland/Libraries/LibWeb/Painting/PaintContext.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibWeb/Painting/PaintContext.h>
namespace Web {
@ -140,4 +141,9 @@ CSSPixelRect PaintContext::scale_to_css_rect(DevicePixelRect rect) const
};
}
bool PaintContext::would_be_fully_clipped_by_painter(DevicePixelRect rect) const
{
return !painter().clip_rect().intersects(rect.to_type<int>().translated(painter().translation()));
}
}