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Simplify converting gray PNG data to RGB

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libpng can do that for us
This commit is contained in:
Paul Cornett 2019-02-02 11:15:36 -08:00
parent 5771b371f2
commit 10d1954832
1 changed files with 5 additions and 30 deletions
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35
src/common/imagpng.cpp
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@ -241,39 +241,12 @@ static
void CopyDataFromPNG(wxImage *image,
unsigned char **lines,
png_uint_32 width,
png_uint_32 height,
int color_type)
png_uint_32 height)
{
// allocated on demand if we have any non-opaque pixels
unsigned char *alpha = NULL;
unsigned char *ptrDst = image->GetData();
if ( !(color_type & PNG_COLOR_MASK_COLOR) )
{
// grey image: GAGAGA... where G == grey component and A == alpha
for ( png_uint_32 y = 0; y < height; y++ )
{
const unsigned char *ptrSrc = lines[y];
for ( png_uint_32 x = 0; x < width; x++ )
{
unsigned char g = *ptrSrc++;
unsigned char a = *ptrSrc++;
// the first time we encounter a transparent pixel we must
// allocate alpha channel for the image
if ( !IsOpaque(a) && !alpha )
alpha = InitAlpha(image, x, y);
if ( alpha )
*alpha++ = a;
*ptrDst++ = g;
*ptrDst++ = g;
*ptrDst++ = g;
}
}
}
else // colour image: RGBRGB...
{
for ( png_uint_32 y = 0; y < height; y++ )
{
@ -285,7 +258,8 @@ void CopyDataFromPNG(wxImage *image,
unsigned char b = *ptrSrc++;
unsigned char a = *ptrSrc++;
// the logic here is the same as for the grey case
// the first time we encounter a transparent pixel we must
// allocate alpha channel for the image
if ( !IsOpaque(a) && !alpha )
alpha = InitAlpha(image, x, y);
@ -350,6 +324,7 @@ wxPNGImageData::DoLoadPNGFile(wxImage* image, wxPNGInfoStruct& wxinfo)
if (bit_depth < 8)
png_set_expand( png_ptr );
png_set_gray_to_rgb(png_ptr);
png_set_strip_16( png_ptr );
png_set_packing( png_ptr );
if (png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS))
@ -435,7 +410,7 @@ wxPNGImageData::DoLoadPNGFile(wxImage* image, wxPNGInfoStruct& wxinfo)
// loaded successfully, now init wxImage with this data
CopyDataFromPNG(image, lines, width, height, color_type);
CopyDataFromPNG(image, lines, width, height);
// This will indicate to the caller that loading succeeded.
ok = true;