bool
SourceSurfaceSkia::InitFromImage(sk_sp<SkImage> aImage,
SurfaceFormat aFormat,
DrawTargetSkia* aOwner)
{
if (!aImage) {
return false;
}
mSize = IntSize(aImage->width(), aImage->height());
// For the raster image case, we want to use the format and stride
// information that the underlying raster image is using, which is
// reliable.
// For the GPU case (for which peekPixels is false), we can't easily
// figure this information out. It is better to report the originally
// intended format and stride that we will convert to if this GPU
// image is ever read back into a raster image.
SkPixmap pixmap;
if (aImage->peekPixels(&pixmap)) {
mFormat =
aFormat != SurfaceFormat::UNKNOWN ?
aFormat :
SkiaColorTypeToGfxFormat(pixmap.colorType(), pixmap.alphaType());
mStride = pixmap.rowBytes();
} else if (aFormat != SurfaceFormat::UNKNOWN) {
mFormat = aFormat;
SkImageInfo info = MakeSkiaImageInfo(mSize, mFormat);
mStride = SkAlign4(info.minRowBytes());
} else {
return false;
}
mImage = aImage;
if (aOwner) {
mDrawTarget = aOwner;
}
return true;
}
