diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Fl_Image.cxx | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/Fl_Image.cxx b/src/Fl_Image.cxx index 985e09212..1c37489a9 100644 --- a/src/Fl_Image.cxx +++ b/src/Fl_Image.cxx @@ -379,8 +379,10 @@ void Fl_RGB_Image::desaturate() { // Composite an image with alpha on systems that don't have accelerated // alpha compositing... static void alpha_blend(Fl_RGB_Image *img, int X, int Y, int W, int H, int cx, int cy) { - uchar *srcptr = (uchar*)img->array + img->d() * (img->w() * cy + cx); - int srcskip = img->d() * (img->w() - W); + int ld = img->ld(); + if (ld == 0) ld = img->w() * img->d(); + uchar *srcptr = (uchar*)img->array + cy * ld + cx * img->d(); + int srcskip = ld - img->d() * W; uchar *dst = new uchar[W * H * 3]; uchar *dstptr = dst; @@ -392,7 +394,6 @@ static void alpha_blend(Fl_RGB_Image *img, int X, int Y, int W, int H, int cx, i if (img->d() == 2) { // Composite grayscale + alpha over RGB... - // Composite RGBA over RGB... for (int y = H; y > 0; y--, srcptr+=srcskip) for (int x = W; x > 0; x--) { srcg = *srcptr++; |