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windowscodecs: Byte swap png read/write for 16-bpp data. 

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46558
Signed-off-by: Vincent Povirk <vincent@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Bryon Roche 2019-05-09 15:30:42 -05:00 committed by Alexandre Julliard
parent 8a91cd6f0a
commit 0c0def962f
1 changed files with 10 additions and 0 deletions
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10
dlls/windowscodecs/pngformat.c
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@ -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,