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windowscodecs: Implement GetResolution for the PNG decoder.

This commit is contained in:
Vincent Povirk 2009-09-23 17:29:42 -05:00 committed by Alexandre Julliard
parent de45a38003
commit 48cf4536e5
1 changed files with 22 additions and 2 deletions
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24
dlls/windowscodecs/pngformat.c
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@ -52,6 +52,7 @@ MAKE_FUNCPTR(png_get_color_type);
MAKE_FUNCPTR(png_get_image_height);
MAKE_FUNCPTR(png_get_image_width);
MAKE_FUNCPTR(png_get_io_ptr);
MAKE_FUNCPTR(png_get_pHYs);
MAKE_FUNCPTR(png_get_PLTE);
MAKE_FUNCPTR(png_get_tRNS);
MAKE_FUNCPTR(png_set_bgr);
@ -83,6 +84,7 @@ static void *load_libpng(void)
LOAD_FUNCPTR(png_get_image_height);
LOAD_FUNCPTR(png_get_image_width);
LOAD_FUNCPTR(png_get_io_ptr);
LOAD_FUNCPTR(png_get_pHYs);
LOAD_FUNCPTR(png_get_PLTE);
LOAD_FUNCPTR(png_get_tRNS);
LOAD_FUNCPTR(png_set_bgr);
@ -510,8 +512,26 @@ static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *ifa
static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
double *pDpiX, double *pDpiY)
{
FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
return E_NOTIMPL;
PngDecoder *This = impl_from_frame(iface);
png_uint_32 ret, xres, yres;
int unit_type;
ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
if (ret && unit_type == PNG_RESOLUTION_METER)
{
*pDpiX = xres * 0.0254;
*pDpiY = yres * 0.0254;
}
else
{
WARN("no pHYs block present\n");
*pDpiX = *pDpiY = 96.0;
}
TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
return S_OK;
}
static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,