windowscodecs: Implement GetResolution for the PNG decoder.
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@ -52,6 +52,7 @@ MAKE_FUNCPTR(png_get_color_type);
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MAKE_FUNCPTR(png_get_image_height);
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MAKE_FUNCPTR(png_get_image_width);
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MAKE_FUNCPTR(png_get_io_ptr);
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MAKE_FUNCPTR(png_get_pHYs);
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MAKE_FUNCPTR(png_get_PLTE);
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MAKE_FUNCPTR(png_get_tRNS);
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MAKE_FUNCPTR(png_set_bgr);
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@ -83,6 +84,7 @@ static void *load_libpng(void)
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LOAD_FUNCPTR(png_get_image_height);
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LOAD_FUNCPTR(png_get_image_width);
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LOAD_FUNCPTR(png_get_io_ptr);
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LOAD_FUNCPTR(png_get_pHYs);
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LOAD_FUNCPTR(png_get_PLTE);
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LOAD_FUNCPTR(png_get_tRNS);
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LOAD_FUNCPTR(png_set_bgr);
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@ -510,8 +512,26 @@ static HRESULT WINAPI PngDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *ifa
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static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
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double *pDpiX, double *pDpiY)
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{
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FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
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return E_NOTIMPL;
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PngDecoder *This = impl_from_frame(iface);
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png_uint_32 ret, xres, yres;
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int unit_type;
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ret = ppng_get_pHYs(This->png_ptr, This->info_ptr, &xres, &yres, &unit_type);
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if (ret && unit_type == PNG_RESOLUTION_METER)
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{
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*pDpiX = xres * 0.0254;
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*pDpiY = yres * 0.0254;
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}
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else
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{
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WARN("no pHYs block present\n");
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*pDpiX = *pDpiY = 96.0;
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}
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TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
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return S_OK;
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}
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static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
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