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windowscodecs: Add support for BI_BITFIELDS compressed BMP files.

oldstable
Vincent Povirk 2009-07-14 14:16:03 -05:00 committed by Alexandre Julliard
parent 42f4004ace
commit b364bc005d
1 changed files with 64 additions and 0 deletions
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64
dlls/windowscodecs/bmpdecode.c
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@ -619,6 +619,24 @@ static HRESULT BmpFrameDecode_ReadUnsupported(BmpFrameDecode* This)
return E_FAIL;
}
struct bitfields_format {
WORD bitcount; /* 0 for end of list */
DWORD redmask;
DWORD greenmask;
DWORD bluemask;
DWORD alphamask;
const WICPixelFormatGUID *pixelformat;
ReadDataFunc read_data_func;
};
static const struct bitfields_format bitfields_formats[] = {
{16,0x7c00,0x3e0,0x1f,0,&GUID_WICPixelFormat16bppBGR555,BmpFrameDecode_ReadUncompressed},
{16,0xf800,0x7e0,0x1f,0,&GUID_WICPixelFormat16bppBGR565,BmpFrameDecode_ReadUncompressed},
{32,0xff0000,0xff00,0xff,0,&GUID_WICPixelFormat32bppBGR,BmpFrameDecode_ReadUncompressed},
{32,0xff0000,0xff00,0xff,0xff000000,&GUID_WICPixelFormat32bppBGRA,BmpFrameDecode_ReadUncompressed},
{0}
};
static const IWICBitmapFrameDecodeVtbl BmpFrameDecode_Vtbl = {
BmpFrameDecode_QueryInterface,
BmpFrameDecode_AddRef,
@ -677,6 +695,17 @@ static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
if (FAILED(hr)) return hr;
if (bytestoread != bytesread) return E_FAIL;
/* if this is a BITMAPINFOHEADER with BI_BITFIELDS compression, we need to
read the extra fields */
if (This->bih.bV5Size == sizeof(BITMAPINFOHEADER) &&
This->bih.bV5Compression == BI_BITFIELDS)
{
hr = IStream_Read(stream, &This->bih.bV5RedMask, 12, &bytesread);
if (FAILED(hr)) return hr;
if (bytesread != 12) return E_FAIL;
This->bih.bV5AlphaMask = 0;
}
/* decide what kind of bitmap this is and how/if we can read it */
if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
{
@ -753,6 +782,41 @@ static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
This->read_data_func = BmpFrameDecode_ReadRLE4;
This->pixelformat = &GUID_WICPixelFormat32bppBGR;
break;
case BI_BITFIELDS:
{
const struct bitfields_format *format;
if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER2))
{
/* BCH2 doesn't support bitfields; this is Huffman 1D compression */
This->bitsperpixel = 0;
This->read_data_func = BmpFrameDecode_ReadUnsupported;
This->pixelformat = &GUID_WICPixelFormatUndefined;
FIXME("Huffman 1D compression is unsupported\n");
break;
}
This->bitsperpixel = This->bih.bV5BitCount;
for (format = bitfields_formats; format->bitcount; format++)
{
if ((format->bitcount == This->bih.bV5BitCount) &&
(format->redmask == This->bih.bV5RedMask) &&
(format->greenmask == This->bih.bV5GreenMask) &&
(format->bluemask == This->bih.bV5BlueMask) &&
(format->alphamask == This->bih.bV5AlphaMask))
{
This->read_data_func = format->read_data_func;
This->pixelformat = format->pixelformat;
break;
}
}
if (!format->bitcount)
{
This->read_data_func = BmpFrameDecode_ReadUncompressed;
This->pixelformat = &GUID_WICPixelFormatUndefined;
FIXME("unsupported bitfields type depth=%i red=%x green=%x blue=%x alpha=%x\n",
This->bih.bV5BitCount, This->bih.bV5RedMask, This->bih.bV5GreenMask, This->bih.bV5BlueMask, This->bih.bV5AlphaMask);
}
break;
}
default:
This->bitsperpixel = 0;
This->read_data_func = BmpFrameDecode_ReadUnsupported;