forked from mirrors/gecko-dev
120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
/* vim:set sw=4 sts=4 et cin: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "nsImageToPixbuf.h"
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#include "imgIContainer.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.h"
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using mozilla::gfx::DataSourceSurface;
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using mozilla::gfx::SurfaceFormat;
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NS_IMPL_ISUPPORTS(nsImageToPixbuf, nsIImageToPixbuf)
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inline unsigned char
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unpremultiply (unsigned char color,
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unsigned char alpha)
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{
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if (alpha == 0)
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return 0;
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// plus alpha/2 to round instead of truncate
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return (color * 255 + alpha / 2) / alpha;
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}
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NS_IMETHODIMP_(GdkPixbuf*)
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nsImageToPixbuf::ConvertImageToPixbuf(imgIContainer* aImage)
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{
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return ImageToPixbuf(aImage);
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}
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GdkPixbuf*
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nsImageToPixbuf::ImageToPixbuf(imgIContainer* aImage)
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{
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RefPtr<SourceSurface> surface =
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aImage->GetFrame(imgIContainer::FRAME_CURRENT,
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imgIContainer::FLAG_SYNC_DECODE);
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// If the last call failed, it was probably because our call stack originates
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// in an imgINotificationObserver event, meaning that we're not allowed request
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// a sync decode. Presumably the originating event is something sensible like
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// OnStopFrame(), so we can just retry the call without a sync decode.
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if (!surface)
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surface = aImage->GetFrame(imgIContainer::FRAME_CURRENT,
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imgIContainer::FLAG_NONE);
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NS_ENSURE_TRUE(surface, nullptr);
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return SourceSurfaceToPixbuf(surface,
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surface->GetSize().width,
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surface->GetSize().height);
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}
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GdkPixbuf*
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nsImageToPixbuf::SourceSurfaceToPixbuf(SourceSurface* aSurface,
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int32_t aWidth,
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int32_t aHeight)
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{
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MOZ_ASSERT(aWidth <= aSurface->GetSize().width &&
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aHeight <= aSurface->GetSize().height,
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"Requested rect is bigger than the supplied surface");
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GdkPixbuf* pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8,
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aWidth, aHeight);
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if (!pixbuf)
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return nullptr;
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uint32_t destStride = gdk_pixbuf_get_rowstride (pixbuf);
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guchar* destPixels = gdk_pixbuf_get_pixels (pixbuf);
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RefPtr<DataSourceSurface> dataSurface = aSurface->GetDataSurface();
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DataSourceSurface::MappedSurface map;
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if (!dataSurface->Map(DataSourceSurface::MapType::READ, &map))
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return nullptr;
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uint8_t* srcData = map.mData;
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int32_t srcStride = map.mStride;
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SurfaceFormat format = dataSurface->GetFormat();
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for (int32_t row = 0; row < aHeight; ++row) {
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for (int32_t col = 0; col < aWidth; ++col) {
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guchar* destPixel = destPixels + row * destStride + 4 * col;
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uint32_t* srcPixel =
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reinterpret_cast<uint32_t*>((srcData + row * srcStride + 4 * col));
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if (format == SurfaceFormat::B8G8R8A8) {
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const uint8_t a = (*srcPixel >> 24) & 0xFF;
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const uint8_t r = unpremultiply((*srcPixel >> 16) & 0xFF, a);
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const uint8_t g = unpremultiply((*srcPixel >> 8) & 0xFF, a);
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const uint8_t b = unpremultiply((*srcPixel >> 0) & 0xFF, a);
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*destPixel++ = r;
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*destPixel++ = g;
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*destPixel++ = b;
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*destPixel++ = a;
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} else {
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MOZ_ASSERT(format == SurfaceFormat::B8G8R8X8);
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const uint8_t r = (*srcPixel >> 16) & 0xFF;
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const uint8_t g = (*srcPixel >> 8) & 0xFF;
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const uint8_t b = (*srcPixel >> 0) & 0xFF;
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*destPixel++ = r;
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*destPixel++ = g;
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*destPixel++ = b;
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*destPixel++ = 0xFF; // A
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}
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}
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}
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dataSurface->Unmap();
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return pixbuf;
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}
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