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windowscodecs: Byte-swap image data from big endian TIFF files.

This commit is contained in:
Vincent Povirk 2010-05-29 10:43:30 -05:00 committed by Alexandre Julliard
parent c30d165ec8
commit e486a17a40
1 changed files with 40 additions and 1 deletions
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41
dlls/windowscodecs/tiffformat.c
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@ -59,6 +59,7 @@ MAKE_FUNCPTR(TIFFClientOpen);
MAKE_FUNCPTR(TIFFClose);
MAKE_FUNCPTR(TIFFCurrentDirectory);
MAKE_FUNCPTR(TIFFGetField);
MAKE_FUNCPTR(TIFFIsByteSwapped);
MAKE_FUNCPTR(TIFFReadDirectory);
MAKE_FUNCPTR(TIFFReadEncodedStrip);
MAKE_FUNCPTR(TIFFSetDirectory);
@ -85,6 +86,7 @@ static void *load_libtiff(void)
LOAD_FUNCPTR(TIFFClose);
LOAD_FUNCPTR(TIFFCurrentDirectory);
LOAD_FUNCPTR(TIFFGetField);
LOAD_FUNCPTR(TIFFIsByteSwapped);
LOAD_FUNCPTR(TIFFReadDirectory);
LOAD_FUNCPTR(TIFFReadEncodedStrip);
LOAD_FUNCPTR(TIFFSetDirectory);
@ -197,6 +199,8 @@ typedef struct {
typedef struct {
const WICPixelFormatGUID *format;
int bps;
int samples;
int bpp;
int indexed;
int reverse_bgr;
@ -220,7 +224,7 @@ static const IWICBitmapFrameDecodeVtbl TiffFrameDecode_Vtbl;
static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
{
uint16 photometric, bps, samples, planar;
uint16 photometric, bps, samples=1, planar;
int ret;
decode_info->indexed = 0;
@ -236,6 +240,8 @@ static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
ret = pTIFFGetField(tiff, TIFFTAG_BITSPERSAMPLE, &bps);
if (!ret) bps = 1;
decode_info->bps = bps;
switch(photometric)
{
case 1: /* BlackIsZero */
@ -313,6 +319,8 @@ static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
return E_FAIL;
}
decode_info->samples = samples;
ret = pTIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &decode_info->width);
if (!ret)
{
@ -667,6 +675,9 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
{
HRESULT hr=S_OK;
tsize_t ret;
int swap_bytes;
swap_bytes = pTIFFIsByteSwapped(This->parent->tiff);
ret = pTIFFSetDirectory(This->parent->tiff, This->index);
@ -700,6 +711,34 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
}
}
if (hr == S_OK && swap_bytes && This->decode_info.bps > 8)
{
UINT row, i, samples_per_row;
BYTE *sample, temp;
samples_per_row = This->decode_info.tile_width * This->decode_info.samples;
switch(This->decode_info.bps)
{
case 16:
for (row=0; row<This->decode_info.tile_height; row++)
{
sample = This->cached_tile + row * This->decode_info.tile_stride;
for (i=0; i<samples_per_row; i++)
{
temp = sample[1];
sample[1] = sample[0];
sample[0] = temp;
sample += 2;
}
}
break;
default:
ERR("unhandled bps for byte swap %u\n", This->decode_info.bps);
return E_FAIL;
}
}
if (hr == S_OK)
{
This->cached_tile_x = tile_x;