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windowscodecs: Make it possible for the BMP decoder to read packed DIBs.

This commit is contained in:
Vincent Povirk 2010-09-16 13:40:55 -05:00 committed by Alexandre Julliard
parent 5c6a1f776a
commit 870afcdd19
2 changed files with 103 additions and 13 deletions
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111
dlls/windowscodecs/bmpdecode.c
View File

@ -18,6 +18,7 @@
#include "config.h"
#include <assert.h>
#include <stdarg.h>
#define COBJMACROS
@ -67,7 +68,8 @@ typedef struct BmpDecoder {
LONG ref;
BOOL initialized;
IStream *stream;
BITMAPFILEHEADER bfh;
ULONG palette_offset;
ULONG image_offset;
BITMAPV5HEADER bih;
const WICPixelFormatGUID *pixelformat;
int bitsperpixel;
@ -76,6 +78,8 @@ typedef struct BmpDecoder {
BYTE *imagedata;
BYTE *imagedatastart;
CRITICAL_SECTION lock; /* must be held when initialized/imagedata is set or stream is accessed */
int packed; /* If TRUE, don't look for a file header and assume a packed DIB. */
int icoframe; /* If TRUE, this is a frame of a .ico file. */
} BmpDecoder;
static inline BmpDecoder *impl_from_frame(IWICBitmapFrameDecode *iface)
@ -213,7 +217,7 @@ static HRESULT WINAPI BmpFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
goto end;
}
offset.QuadPart = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPCOREHEADER);
offset.QuadPart = This->palette_offset;
hr = IStream_Seek(This->stream, offset, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto end;
@ -259,7 +263,7 @@ static HRESULT WINAPI BmpFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
goto end;
}
offset.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
offset.QuadPart = This->palette_offset;
hr = IStream_Seek(This->stream, offset, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto end;
@ -369,7 +373,7 @@ static HRESULT BmpFrameDecode_ReadUncompressed(BmpDecoder* This)
This->imagedata = HeapAlloc(GetProcessHeap(), 0, datasize);
if (!This->imagedata) return E_OUTOFMEMORY;
offbits.QuadPart = This->bfh.bfOffBits;
offbits.QuadPart = This->image_offset;
hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto fail;
@ -447,7 +451,7 @@ static HRESULT BmpFrameDecode_ReadRLE8(BmpDecoder* This)
}
/* read palette */
offbits.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
offbits.QuadPart = This->palette_offset;
hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto fail;
@ -455,7 +459,7 @@ static HRESULT BmpFrameDecode_ReadRLE8(BmpDecoder* This)
if (FAILED(hr) || bytesread != palettesize) goto fail;
/* read RLE data */
offbits.QuadPart = This->bfh.bfOffBits;
offbits.QuadPart = This->image_offset;
hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto fail;
@ -571,7 +575,7 @@ static HRESULT BmpFrameDecode_ReadRLE4(BmpDecoder* This)
}
/* read palette */
offbits.QuadPart = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
offbits.QuadPart = This->palette_offset;
hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto fail;
@ -579,7 +583,7 @@ static HRESULT BmpFrameDecode_ReadRLE4(BmpDecoder* This)
if (FAILED(hr) || bytesread != palettesize) goto fail;
/* read RLE data */
offbits.QuadPart = This->bfh.bfOffBits;
offbits.QuadPart = This->image_offset;
hr = IStream_Seek(This->stream, offbits, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) goto fail;
@ -730,10 +734,15 @@ static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
if (FAILED(hr)) return hr;
hr = IStream_Read(stream, &This->bfh, sizeof(BITMAPFILEHEADER), &bytesread);
if (FAILED(hr)) return hr;
if (bytesread != sizeof(BITMAPFILEHEADER) ||
This->bfh.bfType != 0x4d42 /* "BM" */) return E_FAIL;
if (!This->packed)
{
BITMAPFILEHEADER bfh;
hr = IStream_Read(stream, &bfh, sizeof(BITMAPFILEHEADER), &bytesread);
if (FAILED(hr)) return hr;
if (bytesread != sizeof(BITMAPFILEHEADER) ||
bfh.bfType != 0x4d42 /* "BM" */) return E_FAIL;
This->image_offset = bfh.bfOffBits;
}
hr = IStream_Read(stream, &This->bih.bV5Size, sizeof(DWORD), &bytesread);
if (FAILED(hr)) return hr;
@ -749,6 +758,24 @@ static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
if (FAILED(hr)) return hr;
if (bytestoread != bytesread) return E_FAIL;
if (This->packed)
This->palette_offset = This->bih.bV5Size;
else
This->palette_offset = sizeof(BITMAPFILEHEADER) + This->bih.bV5Size;
if (This->icoframe)
{
if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
{
BITMAPCOREHEADER *bch = (BITMAPCOREHEADER*)&This->bih;
bch->bcHeight /= 2;
}
else
{
This->bih.bV5Height /= 2;
}
}
/* if this is a BITMAPINFOHEADER with BI_BITFIELDS compression, we need to
read the extra fields */
if (This->bih.bV5Size == sizeof(BITMAPINFOHEADER) &&
@ -758,6 +785,7 @@ static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
if (FAILED(hr)) return hr;
if (bytesread != 12) return E_FAIL;
This->bih.bV5AlphaMask = 0;
This->palette_offset += 12;
}
/* decide what kind of bitmap this is and how/if we can read it */
@ -880,6 +908,23 @@ static HRESULT BmpDecoder_ReadHeaders(BmpDecoder* This, IStream *stream)
}
}
if (This->packed)
{
/* In a packed DIB, the image follows the palette. */
ULONG palette_count, palette_size;
if (This->bih.bV5ClrUsed)
palette_count = This->bih.bV5ClrUsed;
else if (This->bih.bV5BitCount <= 8)
palette_count = 1 << This->bih.bV5BitCount;
else
palette_count = 0;
if (This->bih.bV5Size == sizeof(BITMAPCOREHEADER))
palette_size = sizeof(RGBTRIPLE) * palette_count;
else
palette_size = sizeof(RGBQUAD) * palette_count;
This->image_offset = This->palette_offset + palette_size;
}
This->initialized = TRUE;
return S_OK;
@ -1075,7 +1120,7 @@ static const IWICBitmapDecoderVtbl BmpDecoder_Vtbl = {
BmpDecoder_GetFrame
};
HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
static HRESULT BmpDecoder_Construct(int packed, int icoframe, IUnknown *pUnkOuter, REFIID iid, void** ppv)
{
BmpDecoder *This;
HRESULT ret;
@ -1097,9 +1142,49 @@ HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
This->imagedata = NULL;
InitializeCriticalSection(&This->lock);
This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": BmpDecoder.lock");
This->packed = packed;
This->icoframe = icoframe;
ret = IUnknown_QueryInterface((IUnknown*)This, iid, ppv);
IUnknown_Release((IUnknown*)This);
return ret;
}
HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
{
return BmpDecoder_Construct(FALSE, FALSE, pUnkOuter, iid, ppv);
}
HRESULT DibDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
{
return BmpDecoder_Construct(TRUE, FALSE, pUnkOuter, iid, ppv);
}
HRESULT IcoDibDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
{
return BmpDecoder_Construct(TRUE, TRUE, pUnkOuter, iid, ppv);
}
/* Return the offset where the mask of an icon might be, or 0 for failure. */
void BmpDecoder_FindIconMask(IWICBitmapDecoder *decoder, ULONG *mask_offset, int *topdown)
{
BmpDecoder *This = (BmpDecoder*)decoder;
assert(This->lpVtbl == &BmpDecoder_Vtbl);
assert(This->stream != NULL);
if (This->read_data_func == BmpFrameDecode_ReadUncompressed)
{
/* RGB or BITFIELDS data */
ULONG width, height, bytesperrow, datasize;
IWICBitmapFrameDecode_GetSize((IWICBitmapFrameDecode*)&This->lpFrameVtbl, &width, &height);
bytesperrow = (((width * This->bitsperpixel)+31)/32)*4;
datasize = bytesperrow * height;
*mask_offset = This->image_offset + datasize;
}
else
*mask_offset = 0;
*topdown = This->stride > 0;
}

5
dlls/windowscodecs/wincodecs_private.h
View File

@ -29,12 +29,15 @@ extern HRESULT BmpDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID riid, void*
extern HRESULT PngDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT PngEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT BmpEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT DibDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT GifDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID riid, void** ppv);
extern HRESULT IcoDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT JpegDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT TiffDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT IcnsEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT IcoDibDecoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv);
extern HRESULT FlipRotator_Create(IWICBitmapFlipRotator **fliprotator);
extern HRESULT PaletteImpl_Create(IWICPalette **palette);
extern HRESULT StreamImpl_Create(IWICStream **stream);
@ -48,4 +51,6 @@ extern HRESULT CreatePropertyBag2(IPropertyBag2 **ppPropertyBag2);
extern HRESULT CreateComponentInfo(REFCLSID clsid, IWICComponentInfo **ppIInfo);
extern HRESULT CreateComponentEnumerator(DWORD componentTypes, DWORD options, IEnumUnknown **ppIEnumUnknown);
void BmpDecoder_FindIconMask(IWICBitmapDecoder *decoder, ULONG *mask_offset, int *topdown);
#endif /* WINCODECS_PRIVATE_H */