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Link: http://www.fltk.org/str.php?L2606
Version: 1.3-current
Thanks for the report and the patch.
I changed it a little to support positive ld() values other than w()*d()
as well. I tested it by modifying test/unittest_images.cxx and found no
problems.
Please test attached patch fltk_alpha_blend_2.patch and report whether
this fixes your problem.
Link: http://www.fltk.org/str.php?L2606
Version: 1.3-current
Index: src/Fl_Image.cxx
===================================================================
--- src/Fl_Image.cxx (revision 8592)
+++ src/Fl_Image.cxx (working copy)
@@ -379,9 +379,16 @@
// 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;
+ if (ld < 0)
+ srcptr -= ld * (img->h()-1);
+ srcptr += cy * ld + cx * img->d();
+ int srcskip = ld - img->d() * W;
+
uchar *dst = new uchar[W * H * 3];
uchar *dstptr = dst;
@@ -392,7 +399,6 @@
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++;
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