mask.c in psd_native-1.1.1

- old
+ new

@@ -14,10 +14,12 @@
   int mask_height = FIX2INT(rb_funcall(mask, rb_intern("height"), 0));
   int mask_width = FIX2INT(rb_funcall(mask, rb_intern("width"), 0));
   int mask_left = FIX2INT(rb_funcall(mask, rb_intern("left"), 0));
   int mask_top = FIX2INT(rb_funcall(mask, rb_intern("top"), 0));
 
+  int layer_height = FIX2INT(rb_funcall(layer, rb_intern("height"), 0));
+  int layer_width = FIX2INT(rb_funcall(layer, rb_intern("width"), 0));
   int layer_left = FIX2INT(rb_funcall(layer, rb_intern("left"), 0));
   int layer_top = FIX2INT(rb_funcall(layer, rb_intern("top"), 0));
 
   PIXEL color;
   int x, y, doc_x, doc_y, layer_x, layer_y, alpha;
@@ -27,9 +29,11 @@
       doc_x = mask_left + x;
       doc_y = mask_top + y;
       layer_x = doc_x - layer_left;
       layer_y = doc_y - layer_top;
 
+      if (layer_x < 0 || layer_x > layer_width || layer_y < 0 || layer_y > layer_height) continue;
+      
       color = FIX2UINT(rb_funcall(canvas, rb_intern("[]"), 2, INT2FIX(layer_x), INT2FIX(layer_y)));
 
       if (doc_x < 0 || doc_x >= doc_width || doc_y < 0 || doc_y > doc_height) {
         alpha = 0;
       } else {
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