Blend: shortcut to copy when same image pointer is passed in twice

akx · radarhere · hugovk · commit 9787733f9585 · 2026-06-29T18:27:17.000+03:00
Co-authored-by: Andrew Murray &lt;3112309+radarhere@users.noreply.github.com&gt;
diff --git a/src/libImaging/Blend.c b/src/libImaging/Blend.c
@@ -35,7 +35,7 @@ ImagingBlend(Imaging imIn1, Imaging imIn2, float alpha) {
     }
 
     /* Shortcuts */
-    if (alpha == 0.0) {
+    if (imIn1 == imIn2 || alpha == 0.0) {
         return ImagingCopy(imIn1);
     } else if (alpha == 1.0) {
         return ImagingCopy(imIn2);

Original file line number	Diff line number	Diff line change
`@@ -35,7 +35,7 @@ ImagingBlend(Imaging imIn1, Imaging imIn2, float alpha) {`
`35`	`35`	`}`
`36`	`36`
`37`	`37`	`/* Shortcuts */`
`38`		`- if (alpha == 0.0) {`
	`38`	`+ if (imIn1 == imIn2 \|\| alpha == 0.0) {`
`39`	`39`	`return ImagingCopy(imIn1);`
`40`	`40`	`} else if (alpha == 1.0) {`
`41`	`41`	`return ImagingCopy(imIn2);`