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LibGfx: Support getting a bitmap for a region of painter

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This will be needed so we can apply filter effects to the backdrop
of an element in LibWeb.

This now also allows getting a crop of a bitmap in a different format
than the source bitmap. This is for if the painter's bitmap does not
have an alpha channel, but you want to ensure the cropped bitmap does.
This commit is contained in:
MacDue 2022-09-15 08:31:29 +01:00 • committed by Sam Atkins
parent 978a70ddcc
commit 60356c8dde
4 changed files with 13 additions and 3 deletions
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4
Userland/Libraries/LibGfx/Bitmap.cpp
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@ -449,9 +449,9 @@ ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::scaled(float sx, float sy) const
return new_bitmap;
}
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::cropped(Gfx::IntRect crop) const
ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::cropped(Gfx::IntRect crop, Optional<BitmapFormat> new_bitmap_format) const
{
auto new_bitmap = TRY(Gfx::Bitmap::try_create(format(), { crop.width(), crop.height() }, 1));
auto new_bitmap = TRY(Gfx::Bitmap::try_create(new_bitmap_format.value_or(format()), { crop.width(), crop.height() }, 1));
for (int y = 0; y < crop.height(); ++y) {
for (int x = 0; x < crop.width(); ++x) {