[cg] Correct image orientation when drawing

linebender · May 11, 2020 · 586f80d · 586f80d
1 parent 1b397f1
commit 586f80d
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/piet-coregraphics/src/lib.rs b/piet-coregraphics/src/lib.rs
@@ -308,7 +308,13 @@ impl<'a> RenderContext for CoreGraphicsContext<'a> {
         _interp: InterpolationMode,
     ) {
         // TODO: apply interpolation mode
-        self.ctx.draw_image(to_cgrect(rect), image);
+        self.ctx.save();
+        let rect = to_cgrect(rect);
+        // CGImage is drawn flipped by default
+        self.ctx.translate(0., rect.size.height);
+        self.ctx.scale(1.0, -1.0);
+        self.ctx.draw_image(rect, image);
+        self.ctx.restore();
     }
 
     fn draw_image_area(