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windowscodecs: Implement CopyPixels for GIF decoder.

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Vincent Povirk 2009-08-17 11:24:15 -05:00 committed by Alexandre Julliard
parent 04105f7ff3
commit 19e7803088
1 changed files with 53 additions and 2 deletions
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55
dlls/windowscodecs/gifformat.c
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@ -168,11 +168,62 @@ static HRESULT WINAPI GifFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
return S_OK;
}
static HRESULT copy_interlaced_pixels(const BYTE *srcbuffer,
UINT srcwidth, UINT srcheight, INT srcstride, const WICRect *rc,
UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
{
UINT row_offset; /* number of bytes into the source rows where the data starts */
const BYTE *src;
BYTE *dst;
UINT y;
if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
return E_INVALIDARG;
if (dststride < rc->Width)
return E_INVALIDARG;
if ((dststride * rc->Height) > dstbuffersize)
return E_INVALIDARG;
row_offset = rc->X;
dst = dstbuffer;
for (y=rc->Y; y-rc->Y < rc->Height; y++)
{
if (y%8 == 0)
src = srcbuffer + srcstride * (y/8);
else if (y%4 == 0)
src = srcbuffer + srcstride * ((srcheight+7)/8 + y/8);
else if (y%2 == 0)
src = srcbuffer + srcstride * ((srcheight+3)/4 + y/4);
else /* y%2 == 1 */
src = srcbuffer + srcstride * ((srcheight+1)/2 + y/2);
src += row_offset;
memcpy(dst, src, rc->Width);
dst += dststride;
}
return S_OK;
}
static HRESULT WINAPI GifFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,
const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
{
FIXME("(%p,%p,%u,%u,%p): stub\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
return E_NOTIMPL;
GifFrameDecode *This = (GifFrameDecode*)iface;
TRACE("(%p,%p,%u,%u,%p)\n", iface, prc, cbStride, cbBufferSize, pbBuffer);
if (This->frame->ImageDesc.Interlace)
{
return copy_interlaced_pixels(This->frame->RasterBits, This->frame->ImageDesc.Width,
This->frame->ImageDesc.Height, This->frame->ImageDesc.Width,
prc, cbStride, cbBufferSize, pbBuffer);
}
else
{
return copy_pixels(8, This->frame->RasterBits, This->frame->ImageDesc.Width,
This->frame->ImageDesc.Height, This->frame->ImageDesc.Width,
prc, cbStride, cbBufferSize, pbBuffer);
}
}
static HRESULT WINAPI GifFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDecode *iface,