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3b7eede694
We don't discern between opaque and non-opaque alpha types in LibGfx, which at some point we might need to do. But for now, assume all opaque Skia surfaces have premultiplied alpha. Fixes #6892.
120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
/*
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* Copyright (c) 2023-2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/ImmutableBitmap.h>
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#include <LibGfx/PaintingSurface.h>
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#include <LibGfx/SkiaUtils.h>
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#include <core/SkBitmap.h>
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#include <core/SkColorSpace.h>
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#include <core/SkImage.h>
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namespace Gfx {
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struct ImmutableBitmapImpl {
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sk_sp<SkImage> sk_image;
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SkBitmap sk_bitmap;
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Variant<NonnullRefPtr<Gfx::Bitmap>, NonnullRefPtr<Gfx::PaintingSurface>, Empty> source;
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ColorSpace color_space;
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};
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int ImmutableBitmap::width() const
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{
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return m_impl->sk_image->width();
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}
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int ImmutableBitmap::height() const
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{
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return m_impl->sk_image->height();
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}
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IntRect ImmutableBitmap::rect() const
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{
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return { {}, size() };
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}
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IntSize ImmutableBitmap::size() const
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{
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return { width(), height() };
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}
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AlphaType ImmutableBitmap::alpha_type() const
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{
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// We assume premultiplied alpha type for opaque surfaces since that is Skia's preferred alpha type and the
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// effective pixel data is identical between premultiplied and unpremultiplied in that case.
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return m_impl->sk_image->alphaType() == kUnpremul_SkAlphaType ? AlphaType::Unpremultiplied : AlphaType::Premultiplied;
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}
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SkImage const* ImmutableBitmap::sk_image() const
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{
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return m_impl->sk_image.get();
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}
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RefPtr<Gfx::Bitmap const> ImmutableBitmap::bitmap() const
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{
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// FIXME: Implement for PaintingSurface
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return m_impl->source.get<NonnullRefPtr<Gfx::Bitmap>>();
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}
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Color ImmutableBitmap::get_pixel(int x, int y) const
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{
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// FIXME: Implement for PaintingSurface
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return m_impl->source.get<NonnullRefPtr<Gfx::Bitmap>>()->get_pixel(x, y);
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}
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static SkAlphaType to_skia_alpha_type(Gfx::AlphaType alpha_type)
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{
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switch (alpha_type) {
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case AlphaType::Premultiplied:
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return kPremul_SkAlphaType;
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case AlphaType::Unpremultiplied:
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return kUnpremul_SkAlphaType;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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NonnullRefPtr<ImmutableBitmap> ImmutableBitmap::create(NonnullRefPtr<Bitmap> bitmap, ColorSpace color_space)
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{
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ImmutableBitmapImpl impl;
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auto info = SkImageInfo::Make(bitmap->width(), bitmap->height(), to_skia_color_type(bitmap->format()), to_skia_alpha_type(bitmap->alpha_type()), color_space.color_space<sk_sp<SkColorSpace>>());
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impl.sk_bitmap.installPixels(info, const_cast<void*>(static_cast<void const*>(bitmap->scanline(0))), bitmap->pitch());
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impl.sk_bitmap.setImmutable();
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impl.sk_image = impl.sk_bitmap.asImage();
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impl.source = bitmap;
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impl.color_space = move(color_space);
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return adopt_ref(*new ImmutableBitmap(make<ImmutableBitmapImpl>(impl)));
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}
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NonnullRefPtr<ImmutableBitmap> ImmutableBitmap::create(NonnullRefPtr<Bitmap> bitmap, AlphaType alpha_type, ColorSpace color_space)
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{
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// Convert the source bitmap to the right alpha type on a mismatch. We want to do this when converting from a
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// Bitmap to an ImmutableBitmap, since at that point we usually know the right alpha type to use in context.
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auto source_bitmap = bitmap;
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if (source_bitmap->alpha_type() != alpha_type) {
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source_bitmap = MUST(bitmap->clone());
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source_bitmap->set_alpha_type_destructive(alpha_type);
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}
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return create(source_bitmap, move(color_space));
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}
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NonnullRefPtr<ImmutableBitmap> ImmutableBitmap::create_snapshot_from_painting_surface(NonnullRefPtr<PaintingSurface> painting_surface)
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{
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ImmutableBitmapImpl impl;
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impl.sk_image = painting_surface->sk_image_snapshot<sk_sp<SkImage>>();
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impl.source = painting_surface;
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return adopt_ref(*new ImmutableBitmap(make<ImmutableBitmapImpl>(impl)));
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}
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ImmutableBitmap::ImmutableBitmap(NonnullOwnPtr<ImmutableBitmapImpl> impl)
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: m_impl(move(impl))
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{
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}
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ImmutableBitmap::~ImmutableBitmap() = default;
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}
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