mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
/* vim:set sw=4 sts=4 et cin: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include <gdk-pixbuf/gdk-pixbuf.h>
|
|
|
|
#include "gfxASurface.h"
|
|
#include "gfxImageSurface.h"
|
|
#include "gfxContext.h"
|
|
|
|
#include "imgIContainer.h"
|
|
|
|
#include "nsAutoPtr.h"
|
|
|
|
#include "nsImageToPixbuf.h"
|
|
|
|
NS_IMPL_ISUPPORTS1(nsImageToPixbuf, nsIImageToPixbuf)
|
|
|
|
inline unsigned char
|
|
unpremultiply (unsigned char color,
|
|
unsigned char alpha)
|
|
{
|
|
if (alpha == 0)
|
|
return 0;
|
|
// plus alpha/2 to round instead of truncate
|
|
return (color * 255 + alpha / 2) / alpha;
|
|
}
|
|
|
|
NS_IMETHODIMP_(GdkPixbuf*)
|
|
nsImageToPixbuf::ConvertImageToPixbuf(imgIContainer* aImage)
|
|
{
|
|
return ImageToPixbuf(aImage);
|
|
}
|
|
|
|
GdkPixbuf*
|
|
nsImageToPixbuf::ImageToPixbuf(imgIContainer* aImage)
|
|
{
|
|
nsRefPtr<gfxASurface> surface;
|
|
aImage->GetFrame(imgIContainer::FRAME_CURRENT,
|
|
imgIContainer::FLAG_SYNC_DECODE,
|
|
getter_AddRefs(surface));
|
|
|
|
// If the last call failed, it was probably because our call stack originates
|
|
// in an imgINotificationObserver event, meaning that we're not allowed request
|
|
// a sync decode. Presumably the originating event is something sensible like
|
|
// OnStopFrame(), so we can just retry the call without a sync decode.
|
|
if (!surface)
|
|
aImage->GetFrame(imgIContainer::FRAME_CURRENT,
|
|
imgIContainer::FLAG_NONE,
|
|
getter_AddRefs(surface));
|
|
|
|
NS_ENSURE_TRUE(surface, nullptr);
|
|
|
|
nsRefPtr<gfxImageSurface> frame(surface->GetAsReadableARGB32ImageSurface());
|
|
NS_ENSURE_TRUE(frame, nullptr);
|
|
|
|
return ImgSurfaceToPixbuf(frame, frame->Width(), frame->Height());
|
|
}
|
|
|
|
GdkPixbuf*
|
|
nsImageToPixbuf::ImgSurfaceToPixbuf(gfxImageSurface* aImgSurface, int32_t aWidth, int32_t aHeight)
|
|
{
|
|
GdkPixbuf* pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8,
|
|
aWidth, aHeight);
|
|
if (!pixbuf)
|
|
return nullptr;
|
|
|
|
uint32_t rowstride = gdk_pixbuf_get_rowstride (pixbuf);
|
|
guchar* pixels = gdk_pixbuf_get_pixels (pixbuf);
|
|
|
|
long cairoStride = aImgSurface->Stride();
|
|
unsigned char* cairoData = aImgSurface->Data();
|
|
|
|
gfxASurface::gfxImageFormat format = aImgSurface->Format();
|
|
|
|
for (int32_t row = 0; row < aHeight; ++row) {
|
|
for (int32_t col = 0; col < aWidth; ++col) {
|
|
guchar* pixel = pixels + row * rowstride + 4 * col;
|
|
|
|
uint32_t* cairoPixel = reinterpret_cast<uint32_t*>
|
|
((cairoData + row * cairoStride + 4 * col));
|
|
|
|
if (format == gfxASurface::ImageFormatARGB32) {
|
|
const uint8_t a = (*cairoPixel >> 24) & 0xFF;
|
|
const uint8_t r = unpremultiply((*cairoPixel >> 16) & 0xFF, a);
|
|
const uint8_t g = unpremultiply((*cairoPixel >> 8) & 0xFF, a);
|
|
const uint8_t b = unpremultiply((*cairoPixel >> 0) & 0xFF, a);
|
|
|
|
*pixel++ = r;
|
|
*pixel++ = g;
|
|
*pixel++ = b;
|
|
*pixel++ = a;
|
|
} else {
|
|
NS_ASSERTION(format == gfxASurface::ImageFormatRGB24,
|
|
"unexpected format");
|
|
const uint8_t r = (*cairoPixel >> 16) & 0xFF;
|
|
const uint8_t g = (*cairoPixel >> 8) & 0xFF;
|
|
const uint8_t b = (*cairoPixel >> 0) & 0xFF;
|
|
|
|
*pixel++ = r;
|
|
*pixel++ = g;
|
|
*pixel++ = b;
|
|
*pixel++ = 0xFF; // A
|
|
}
|
|
}
|
|
}
|
|
|
|
return pixbuf;
|
|
}
|
|
|
|
GdkPixbuf*
|
|
nsImageToPixbuf::SurfaceToPixbuf(gfxASurface* aSurface, int32_t aWidth, int32_t aHeight)
|
|
{
|
|
if (aSurface->CairoStatus()) {
|
|
NS_ERROR("invalid surface");
|
|
return nullptr;
|
|
}
|
|
|
|
nsRefPtr<gfxImageSurface> imgSurface;
|
|
if (aSurface->GetType() == gfxASurface::SurfaceTypeImage) {
|
|
imgSurface = static_cast<gfxImageSurface*>
|
|
(static_cast<gfxASurface*>(aSurface));
|
|
} else {
|
|
imgSurface = new gfxImageSurface(gfxIntSize(aWidth, aHeight),
|
|
gfxImageSurface::ImageFormatARGB32);
|
|
|
|
if (!imgSurface)
|
|
return nullptr;
|
|
|
|
nsRefPtr<gfxContext> context = new gfxContext(imgSurface);
|
|
if (!context)
|
|
return nullptr;
|
|
|
|
context->SetOperator(gfxContext::OPERATOR_SOURCE);
|
|
context->SetSource(aSurface);
|
|
context->Paint();
|
|
}
|
|
|
|
return ImgSurfaceToPixbuf(imgSurface, aWidth, aHeight);
|
|
}
|