From: Bryon Roche kain@kain.org
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46558 Signed-off-by: Vincent Povirk vincent@codeweavers.com --- dlls/windowscodecs/pngformat.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/dlls/windowscodecs/pngformat.c b/dlls/windowscodecs/pngformat.c index db0fa9ed507..a79e7e1cffa 100644 --- a/dlls/windowscodecs/pngformat.c +++ b/dlls/windowscodecs/pngformat.c @@ -332,6 +332,7 @@ MAKE_FUNCPTR(png_set_strip_16); MAKE_FUNCPTR(png_set_tRNS); MAKE_FUNCPTR(png_set_tRNS_to_alpha); MAKE_FUNCPTR(png_set_write_fn); +MAKE_FUNCPTR(png_set_swap); MAKE_FUNCPTR(png_read_end); MAKE_FUNCPTR(png_read_image); MAKE_FUNCPTR(png_read_info); @@ -398,6 +399,7 @@ static void *load_libpng(void) LOAD_FUNCPTR(png_set_tRNS); LOAD_FUNCPTR(png_set_tRNS_to_alpha); LOAD_FUNCPTR(png_set_write_fn); + LOAD_FUNCPTR(png_set_swap); LOAD_FUNCPTR(png_read_end); LOAD_FUNCPTR(png_read_image); LOAD_FUNCPTR(png_read_info); @@ -642,6 +644,10 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p color_type = ppng_get_color_type(This->png_ptr, This->info_ptr); bit_depth = ppng_get_bit_depth(This->png_ptr, This->info_ptr);
+ /* PNGs with bit-depth greater than 8 are network byte order. Windows does not expect this. */ + if (bit_depth > 8) + ppng_set_swap(This->png_ptr); + /* check for color-keyed alpha */ transparency = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
@@ -1643,6 +1649,10 @@ static HRESULT WINAPI PngFrameEncode_WritePixels(IWICBitmapFrameEncode *iface, } }
+ /* Tell PNG we need to byte swap if writing a >8-bpp image */ + if (This->format->bit_depth > 8) + ppng_set_swap(This->png_ptr); + ppng_set_IHDR(This->png_ptr, This->info_ptr, This->width, This->height, This->format->bit_depth, This->format->color_type, This->interlace ? PNG_INTERLACE_ADAM7 : PNG_INTERLACE_NONE,