Fix divide by zero error

esilverberg · esilverberg · commit 7a70eebc80b4 · 2012-02-02T12:26:37.000-05:00
diff --git a/Classes/ImageFilter.m b/Classes/ImageFilter.m
@@ -115,6 +115,7 @@ void filterSepia(UInt8 *pixelBuf, UInt32 offset, void *context)
 void filterPosterize(UInt8 *pixelBuf, UInt32 offset, void *context)
 {
 	int levels = *((int*)context);
+	if (levels == 0) levels = 1; // avoid divide by zero
 	int step = 255 / levels;
 	
 	int r = offset;

Original file line number	Diff line number	Diff line change
`@@ -115,6 +115,7 @@ void filterSepia(UInt8 pixelBuf, UInt32 offset, void context)`
`115`	`115`	`void filterPosterize(UInt8 pixelBuf, UInt32 offset, void context)`
`116`	`116`	`{`
`117`	`117`	`int levels = ((int)context);`
	`118`	`+ if (levels == 0) levels = 1; // avoid divide by zero`
`118`	`119`	`int step = 255 / levels;`
`119`	`120`
`120`	`121`	`int r = offset;`