Changeset 73310 in webkit

Timestamp:

Dec 3, 2010 3:16:20 PM (13 years ago)

Author:

andersca@apple.com

Message:

Flip the destination context when painting a backing store into the destination
​https://bugs.webkit.org/show_bug.cgi?id=50491

Reviewed by Dan Bernstein.

• Shared/cg/BackingStoreCG.cpp:

(WebKit::BackingStore::paint):

Location:

trunk/WebKit2

Files:

• ChangeLog (modified) (1 diff)
• Shared/cg/BackingStoreCG.cpp (modified) (1 diff)

trunk/WebKit2/ChangeLog

@@ -173 +173 @@
 
         * UIProcess/API/qt/qwkpage.cpp:
+
+2010-12-03  Anders Carlsson  <andersca@apple.com>
+
+        Reviewed by Dan Bernstein.
+
+        Flip the destination context when painting a backing store into the destination
+        https://bugs.webkit.org/show_bug.cgi?id=50491
+
+        * Shared/cg/BackingStoreCG.cpp:
+        (WebKit::BackingStore::paint):
 
 2010-12-03  Anders Carlsson  <andersca@apple.com>

trunk/WebKit2/Shared/cg/BackingStoreCG.cpp

@@ -65 +65 @@
     
     CGContextSaveGState(cgContext);
+
     CGContextClipToRect(cgContext, CGRectMake(dstPoint.x(), dstPoint.y(), srcRect.width(), srcRect.height()));
-    CGContextTranslateCTM(cgContext, -srcRect.x(), -srcRect.y());
-    CGContextDrawImage(cgContext, CGRectMake(dstPoint.x(), dstPoint.y(), CGImageGetWidth(image.get()), CGImageGetHeight(image.get())), image.get());
+    CGContextScaleCTM(cgContext, 1, -1);
+
+    CGFloat imageHeight = CGImageGetHeight(image.get());
+    CGFloat imageWidth = CGImageGetWidth(image.get());
+
+    CGFloat destX = dstPoint.x() - srcRect.x();
+    CGFloat destY = -imageHeight - dstPoint.y() + srcRect.y();
+
+    CGContextDrawImage(cgContext, CGRectMake(destX, destY, imageWidth, imageHeight), image.get());
     CGContextRestoreGState(cgContext);
 }