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fix alpha-channel transparency in PNG

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This commit is contained in:
Igor Sysoev 2009-09-15 09:47:12 +00:00
parent 6db93ab8ba
commit f1edf87d04
1 changed files with 10 additions and 0 deletions
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10
src/http/modules/ngx_http_image_filter_module.c
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@ -768,6 +768,11 @@ ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
return NULL; return NULL;
} }
if (colors == 0) {
gdImageSaveAlpha(dst, 1);
gdImageAlphaBlending(dst, 0);
}
gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy);
gdImageDestroy(src); gdImageDestroy(src);
@ -810,6 +815,11 @@ ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
"image crop: %d x %d @ %d x %d", "image crop: %d x %d @ %d x %d",
dx, dy, ox, oy); dx, dy, ox, oy);
if (colors == 0) {
gdImageSaveAlpha(dst, 1);
gdImageAlphaBlending(dst, 0);
}
gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy);
gdImageDestroy(src); gdImageDestroy(src);