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windowscodecs: Support Run-length encoded TGA images.

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Vincent Povirk 2010-10-20 15:36:35 -05:00 committed by Alexandre Julliard
parent a64400ec98
commit a5a7d6c9f0
1 changed files with 58 additions and 2 deletions
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60
dlls/windowscodecs/tgaformat.c
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@ -577,6 +577,63 @@ static HRESULT WINAPI TgaDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
return E_NOTIMPL;
}
static HRESULT TgaDecoder_ReadRLE(TgaDecoder *This, BYTE *imagebits, int datasize)
{
int i=0, j, bytesperpixel;
ULONG bytesread;
HRESULT hr=S_OK;
bytesperpixel = This->header.depth / 8;
while (i<datasize)
{
BYTE rc;
int count, size;
BYTE pixeldata[4];
hr = IStream_Read(This->stream, &rc, 1, &bytesread);
if (bytesread != 1) hr = E_FAIL;
if (FAILED(hr)) break;
count = (rc&0x7f)+1;
size = count * bytesperpixel;
if (size + i > datasize)
{
WARN("RLE packet too large\n");
hr = E_FAIL;
break;
}
if (rc&0x80)
{
/* Run-length packet */
hr = IStream_Read(This->stream, pixeldata, bytesperpixel, &bytesread);
if (bytesread != bytesperpixel) hr = E_FAIL;
if (FAILED(hr)) break;
if (bytesperpixel == 1)
memset(&imagebits[i], pixeldata[0], count);
else
{
for (j=0; j<count; j++)
memcpy(&imagebits[i+j*bytesperpixel], pixeldata, bytesperpixel);
}
}
else
{
/* Raw packet */
hr = IStream_Read(This->stream, &imagebits[i], size, &bytesread);
if (bytesread != size) hr = E_FAIL;
if (FAILED(hr)) break;
}
i += size;
}
return hr;
}
static HRESULT TgaDecoder_ReadImage(TgaDecoder *This)
{
HRESULT hr=S_OK;
@ -614,8 +671,7 @@ static HRESULT TgaDecoder_ReadImage(TgaDecoder *This)
{
if (This->header.image_type & IMAGETYPE_RLE)
{
FIXME("RLE decoding not implemented\n");
hr = E_NOTIMPL;
hr = TgaDecoder_ReadRLE(This, This->imagebits, datasize);
}
else
{