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LibGfx: Add Gfx::Bitmap::apply_mask()
This allows applying an alpha or luminance mask to a bitmap (of the same size) inplace.
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2 changed files with 26 additions and 0 deletions
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@ -344,6 +344,25 @@ ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::flipped(Gfx::Orientation orientation
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return new_bitmap;
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}
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void Bitmap::apply_mask(Gfx::Bitmap const& mask, MaskKind mask_kind)
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{
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VERIFY(size() == mask.size());
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for (int y = 0; y < height(); y++) {
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for (int x = 0; x < width(); x++) {
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auto color = get_pixel(x, y);
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auto mask_color = mask.get_pixel(x, y);
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if (mask_kind == MaskKind::Luminance) {
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color = color.with_alpha(color.alpha() * mask_color.alpha() * mask_color.luminosity() / (255 * 255));
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} else {
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VERIFY(mask_kind == MaskKind::Alpha);
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color = color.with_alpha(color.alpha() * mask_color.alpha() / 255);
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}
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set_pixel(x, y, color);
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}
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}
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}
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ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Bitmap::scaled(int sx, int sy) const
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{
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VERIFY(sx >= 0 && sy >= 0);
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