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windowscodecs: Implement TiffDecoder_GetResolution.

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This commit is contained in:
Vincent Povirk 2011-04-05 16:42:44 -05:00 committed by Alexandre Julliard
parent f989011be2
commit 562267a7fb
1 changed files with 48 additions and 2 deletions
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50
dlls/windowscodecs/tiffformat.c
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@ -219,6 +219,8 @@ typedef struct {
UINT tile_size;
int tiled;
UINT tiles_across;
UINT resolution_unit;
float xres, yres;
} tiff_decode_info;
typedef struct {
@ -458,6 +460,25 @@ static HRESULT tiff_get_decode_info(TIFF *tiff, tiff_decode_info *decode_info)
return E_FAIL;
}
decode_info->resolution_unit = 0;
pTIFFGetField(tiff, TIFFTAG_RESOLUTIONUNIT, &decode_info->resolution_unit);
if (decode_info->resolution_unit != 0)
{
ret = pTIFFGetField(tiff, TIFFTAG_XRESOLUTION, &decode_info->xres);
if (!ret)
{
WARN("missing X resolution\n");
decode_info->resolution_unit = 0;
}
ret = pTIFFGetField(tiff, TIFFTAG_YRESOLUTION, &decode_info->yres);
if (!ret)
{
WARN("missing Y resolution\n");
decode_info->resolution_unit = 0;
}
}
return S_OK;
}
@ -769,8 +790,33 @@ static HRESULT WINAPI TiffFrameDecode_GetPixelFormat(IWICBitmapFrameDecode *ifac
static HRESULT WINAPI TiffFrameDecode_GetResolution(IWICBitmapFrameDecode *iface,
double *pDpiX, double *pDpiY)
{
FIXME("(%p,%p,%p)\n", iface, pDpiX, pDpiY);
return E_NOTIMPL;
TiffFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
switch (This->decode_info.resolution_unit)
{
default:
FIXME("unknown resolution unit %i\n", This->decode_info.resolution_unit);
/* fall through */
case 0: /* Not set */
*pDpiX = *pDpiY = 96.0;
break;
case 1: /* Relative measurements */
*pDpiX = 96.0;
*pDpiY = 96.0 * This->decode_info.yres / This->decode_info.xres;
break;
case 2: /* Inch */
*pDpiX = This->decode_info.xres;
*pDpiY = This->decode_info.yres;
break;
case 3: /* Centimeter */
*pDpiX = This->decode_info.xres / 2.54;
*pDpiY = This->decode_info.yres / 2.54;
break;
}
TRACE("(%p) <-- %f,%f unit=%i\n", iface, *pDpiX, *pDpiY, This->decode_info.resolution_unit);
return S_OK;
}
static HRESULT WINAPI TiffFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,