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140 lines
4.5 KiB
C++
140 lines
4.5 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 "gfxASurface.h"
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#include "gfxImageSurface.h"
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#include "gfxContext.h"
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#include "imgIContainer.h"
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#include "nsAutoPtr.h"
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#include "nsImageToPixbuf.h"
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NS_IMPL_ISUPPORTS1(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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nsRefPtr<gfxImageSurface> frame;
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nsresult rv = aImage->CopyFrame(imgIContainer::FRAME_CURRENT,
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imgIContainer::FLAG_SYNC_DECODE,
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getter_AddRefs(frame));
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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 (NS_FAILED(rv))
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aImage->CopyFrame(imgIContainer::FRAME_CURRENT,
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imgIContainer::FLAG_NONE,
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getter_AddRefs(frame));
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if (!frame)
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return nullptr;
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return ImgSurfaceToPixbuf(frame, frame->Width(), frame->Height());
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}
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GdkPixbuf*
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nsImageToPixbuf::ImgSurfaceToPixbuf(gfxImageSurface* aImgSurface, int32_t aWidth, int32_t aHeight)
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{
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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 rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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guchar* pixels = gdk_pixbuf_get_pixels (pixbuf);
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long cairoStride = aImgSurface->Stride();
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unsigned char* cairoData = aImgSurface->Data();
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gfxASurface::gfxImageFormat format = aImgSurface->Format();
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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* pixel = pixels + row * rowstride + 4 * col;
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uint32_t* cairoPixel = reinterpret_cast<uint32_t*>
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((cairoData + row * cairoStride + 4 * col));
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if (format == gfxASurface::ImageFormatARGB32) {
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const uint8_t a = (*cairoPixel >> 24) & 0xFF;
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const uint8_t r = unpremultiply((*cairoPixel >> 16) & 0xFF, a);
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const uint8_t g = unpremultiply((*cairoPixel >> 8) & 0xFF, a);
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const uint8_t b = unpremultiply((*cairoPixel >> 0) & 0xFF, a);
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*pixel++ = r;
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*pixel++ = g;
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*pixel++ = b;
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*pixel++ = a;
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} else {
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NS_ASSERTION(format == gfxASurface::ImageFormatRGB24,
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"unexpected format");
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const uint8_t r = (*cairoPixel >> 16) & 0xFF;
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const uint8_t g = (*cairoPixel >> 8) & 0xFF;
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const uint8_t b = (*cairoPixel >> 0) & 0xFF;
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*pixel++ = r;
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*pixel++ = g;
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*pixel++ = b;
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*pixel++ = 0xFF; // A
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}
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}
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}
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return pixbuf;
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}
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GdkPixbuf*
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nsImageToPixbuf::SurfaceToPixbuf(gfxASurface* aSurface, int32_t aWidth, int32_t aHeight)
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{
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if (aSurface->CairoStatus()) {
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NS_ERROR("invalid surface");
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return nullptr;
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}
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nsRefPtr<gfxImageSurface> imgSurface;
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if (aSurface->GetType() == gfxASurface::SurfaceTypeImage) {
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imgSurface = static_cast<gfxImageSurface*>
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(static_cast<gfxASurface*>(aSurface));
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} else {
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imgSurface = new gfxImageSurface(gfxIntSize(aWidth, aHeight),
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gfxImageSurface::ImageFormatARGB32);
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if (!imgSurface)
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return nullptr;
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nsRefPtr<gfxContext> context = new gfxContext(imgSurface);
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if (!context)
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return nullptr;
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context->SetOperator(gfxContext::OPERATOR_SOURCE);
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context->SetSource(aSurface);
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context->Paint();
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}
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return ImgSurfaceToPixbuf(imgSurface, aWidth, aHeight);
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}
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