commit f1edf87d04129b6ade9ef1eacf49ab4109fe1b14
author Igor Sysoev <igor@sysoev.ru> Tue Sep 15 09:47:12 2009 +0000
committer Igor Sysoev <igor@sysoev.ru> Tue Sep 15 09:47:12 2009 +0000
tree 3da5115a6e2068696edf38b35292c2c473e76c07
parent 6db93ab8ba4ca496feadf6267ab6d2c42187ef39

fix alpha-channel transparency in PNG

src/http/modules/ngx_http_image_filter_module.c

diff --git a/src/http/modules/ngx_http_image_filter_module.c b/src/http/modules/ngx_http_image_filter_module.c
index 653cc79..70b2731 100644
--- a/src/http/modules/ngx_http_image_filter_module.c
+++ b/src/http/modules/ngx_http_image_filter_module.c
@@ -768,6 +768,11 @@
             return NULL;
         }
 
+        if (colors == 0) {
+            gdImageSaveAlpha(dst, 1);
+            gdImageAlphaBlending(dst, 0);
+        }
+
         gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy);
 
         gdImageDestroy(src);
@@ -810,6 +815,11 @@
                            "image crop: %d x %d @ %d x %d",
                            dx, dy, ox, oy);
 
+            if (colors == 0) {
+                gdImageSaveAlpha(dst, 1);
+                gdImageAlphaBlending(dst, 0);
+            }
+
             gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy);
 
             gdImageDestroy(src);