size_t
DecodedSurfaceProvider::LogicalSizeInBytes() const
{
// Single frame images are always 32bpp.
IntSize size = GetSurfaceKey().Size();
return size.width * size.height * sizeof(uint32_t);
}
size_t
AnimationSurfaceProvider::LogicalSizeInBytes() const
{
// When decoding animated images, we need at most three live surfaces: the
// composited surface, the previous composited surface for
// DisposalMethod::RESTORE_PREVIOUS, and the surface we're currently decoding
// into. The composited surfaces are always BGRA. Although the surface we're
// decoding into may be paletted, and may be smaller than the real size of the
// image, we assume the worst case here.
// XXX(seth): Note that this is actually not accurate yet; we're storing the
// full sequence of frames, not just the three live surfaces mentioned above.
// Unfortunately there's no way to know in advance how many frames an
// animation has, so we really can't do better here. This will become correct
// once bug 1289954 is complete.
IntSize size = GetSurfaceKey().Size();
return 3 * size.width * size.height * sizeof(uint32_t);
}
