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windowscodecs: Implement CopyPalette for the PNG decoder.

This commit is contained in:
Vincent Povirk 2009-08-27 13:17:06 -05:00 committed by Alexandre Julliard
parent bcd8dc2d53
commit 4657938235
1 changed files with 43 additions and 2 deletions
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45
dlls/windowscodecs/pngformat.c
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@ -52,6 +52,8 @@ 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_PLTE);
MAKE_FUNCPTR(png_get_tRNS);
MAKE_FUNCPTR(png_set_bgr);
MAKE_FUNCPTR(png_set_gray_to_rgb);
MAKE_FUNCPTR(png_set_read_fn);
@ -78,6 +80,8 @@ 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_PLTE);
LOAD_FUNCPTR(png_get_tRNS);
LOAD_FUNCPTR(png_set_bgr);
LOAD_FUNCPTR(png_set_gray_to_rgb);
LOAD_FUNCPTR(png_set_read_fn);
@ -484,8 +488,45 @@ static HRESULT WINAPI PngDecoder_Frame_GetResolution(IWICBitmapFrameDecode *ifac
static HRESULT WINAPI PngDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
IWICPalette *pIPalette)
{
FIXME("(%p,%p): stub\n", iface, pIPalette);
return E_NOTIMPL;
PngDecoder *This = impl_from_frame(iface);
png_uint_32 ret;
png_colorp png_palette;
int num_palette;
WICColor palette[256];
png_bytep trans;
int num_trans;
png_color_16p trans_values;
int i;
TRACE("(%p,%p)\n", iface, pIPalette);
ret = ppng_get_PLTE(This->png_ptr, This->info_ptr, &png_palette, &num_palette);
if (!ret) return WINCODEC_ERR_PALETTEUNAVAILABLE;
if (num_palette > 256)
{
ERR("palette has %i colors?!\n", num_palette);
return E_FAIL;
}
for (i=0; i<num_palette; i++)
{
palette[i] = (0xff000000|
png_palette[i].red << 16|
png_palette[i].green << 8|
png_palette[i].blue);
}
ret = ppng_get_tRNS(This->png_ptr, This->info_ptr, &trans, &num_trans, &trans_values);
if (ret)
{
for (i=0; i<num_trans; i++)
{
palette[trans[i]] = 0x00000000;
}
}
return IWICPalette_InitializeCustom(pIPalette, palette, num_palette);
}
static HRESULT WINAPI PngDecoder_Frame_CopyPixels(IWICBitmapFrameDecode *iface,