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LibGfx: Let PaintingSurface read from source offsets

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Remote canvas readback needs to copy subrects out of a larger Skia
surface instead of always copying from the origin.
This commit is contained in:
Aliaksandr Kalenik 2026-06-16 18:54:55 +02:00 committed by Alexander Kalenik
parent 6757971d59
commit 12f9318106
2 changed files with 3 additions and 3 deletions
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4
Libraries/LibGfx/PaintingSurface.cpp
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@ -160,13 +160,13 @@ SharedImage PaintingSurface::snapshot_into_shared_image() const
return shared_image_buffer.export_shared_image();
}
void PaintingSurface::read_into_bitmap(Bitmap& bitmap) const
void PaintingSurface::read_into_bitmap(Bitmap& bitmap, IntPoint source_position) const
{
auto color_type = to_skia_color_type(bitmap.format());
auto alpha_type = to_skia_alpha_type(bitmap.format(), bitmap.alpha_type());
auto image_info = SkImageInfo::Make(bitmap.width(), bitmap.height(), color_type, alpha_type, SkColorSpace::MakeSRGB());
SkPixmap const pixmap(image_info, bitmap.begin(), bitmap.pitch());
m_impl->surface->readPixels(pixmap, 0, 0);
m_impl->surface->readPixels(pixmap, source_position.x(), source_position.y());
}
void PaintingSurface::write_from_bitmap(Bitmap const& bitmap)

2
Libraries/LibGfx/PaintingSurface.h
View file

@ -56,7 +56,7 @@ public:
NonnullRefPtr<Bitmap> snapshot_bitmap() const;
SharedImage snapshot_into_shared_image() const;
void read_into_bitmap(Bitmap&) const;
void read_into_bitmap(Bitmap&, IntPoint source_position = {}) const;
void write_from_bitmap(Bitmap const&);
void notify_content_will_change();