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windowscodecs: Support TIFF images with alpha data.

This commit is contained in:
Vincent Povirk 2010-05-29 12:32:32 -05:00 committed by Alexandre Julliard
parent 0ce1c796e4
commit b9beb9227d
3 changed files with 48 additions and 6 deletions
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2
dlls/windowscodecs/regsvr.c
View File

@ -1083,6 +1083,8 @@ static GUID const * const tiff_formats[] = {
&GUID_WICPixelFormat32bppBGRA,
&GUID_WICPixelFormat32bppPBGRA,
&GUID_WICPixelFormat48bppRGB,
&GUID_WICPixelFormat64bppRGBA,
&GUID_WICPixelFormat64bppPRGBA,
NULL
};

51
dlls/windowscodecs/tiffformat.c
View File

@ -227,6 +227,7 @@ static const IWICBitmapFrameDecodeVtbl TiffFrameDecode_Vtbl;
static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
{
uint16 photometric, bps, samples, planar;
uint16 extra_sample_count, *extra_samples;
int ret;
decode_info->indexed = 0;
@ -293,7 +294,16 @@ static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
case 2: /* RGB */
decode_info->bpp = bps * samples;
if (samples != 3)
if (samples == 4)
{
ret = pTIFFGetField(tiff, TIFFTAG_EXTRASAMPLES, &extra_sample_count, &extra_samples);
if (!ret)
{
WARN("Cannot get extra sample type for RGB data, ret=%i count=%i\n", ret, extra_sample_count);
return E_FAIL;
}
}
else if (samples != 3)
{
FIXME("unhandled RGB sample count %u\n", samples);
return E_FAIL;
@ -303,10 +313,38 @@ static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
{
case 8:
decode_info->reverse_bgr = 1;
decode_info->format = &GUID_WICPixelFormat24bppBGR;
if (samples == 3)
decode_info->format = &GUID_WICPixelFormat24bppBGR;
else
switch(extra_samples[0])
{
case 1: /* Associated (pre-multiplied) alpha data */
decode_info->format = &GUID_WICPixelFormat32bppPBGRA;
break;
case 2: /* Unassociated alpha data */
decode_info->format = &GUID_WICPixelFormat32bppBGRA;
break;
default:
FIXME("unhandled extra sample type %i\n", extra_samples[0]);
return E_FAIL;
}
break;
case 16:
decode_info->format = &GUID_WICPixelFormat48bppRGB;
if (samples == 3)
decode_info->format = &GUID_WICPixelFormat48bppRGB;
else
switch(extra_samples[0])
{
case 1: /* Associated (pre-multiplied) alpha data */
decode_info->format = &GUID_WICPixelFormat64bppPRGBA;
break;
case 2: /* Unassociated alpha data */
decode_info->format = &GUID_WICPixelFormat64bppRGBA;
break;
default:
FIXME("unhandled extra sample type %i\n", extra_samples[0]);
return E_FAIL;
}
break;
default:
FIXME("unhandled RGB bit count %u\n", bps);
@ -745,19 +783,20 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
if (hr == S_OK && This->decode_info.reverse_bgr)
{
if (This->decode_info.format == &GUID_WICPixelFormat24bppBGR)
if (This->decode_info.bps == 8)
{
UINT i, total_pixels;
UINT i, total_pixels, sample_count;
BYTE *pixel, temp;
total_pixels = This->decode_info.tile_width * This->decode_info.tile_height;
pixel = This->cached_tile;
sample_count = This->decode_info.samples;
for (i=0; i<total_pixels; i++)
{
temp = pixel[2];
pixel[2] = pixel[0];
pixel[0] = temp;
pixel += 3;
pixel += sample_count;
}
}
}

1
include/wincodec.idl
View File

@ -165,6 +165,7 @@ cpp_quote("DEFINE_GUID(GUID_WICPixelFormat32bppPBGRA, 0x6fddc324,0x4e03,0x4bfe,0
cpp_quote("DEFINE_GUID(GUID_WICPixelFormat48bppRGB, 0x6fddc324,0x4e03,0x4bfe,0xb1,0x85,0x3d,0x77,0x76,0x8d,0xc9,0x15);")
cpp_quote("DEFINE_GUID(GUID_WICPixelFormat64bppRGBA, 0x6fddc324,0x4e03,0x4bfe,0xb1,0x85,0x3d,0x77,0x76,0x8d,0xc9,0x16);")
cpp_quote("DEFINE_GUID(GUID_WICPixelFormat64bppPRGBA, 0x6fddc324,0x4e03,0x4bfe,0xb1,0x85,0x3d,0x77,0x76,0x8d,0xc9,0x17);")
cpp_quote("DEFINE_GUID(GUID_WICPixelFormat32bppCMYK, 0x6fddc324,0x4e03,0x4fbe,0xb1,0x85,0x3d,0x77,0x76,0x8d,0xc9,0x1c);")