From aa42c9af6ea2158a685ebf9b338e6d2355712268 Mon Sep 17 00:00:00 2001
From: Chet Haase <chet@google.com>
Date: Tue, 16 Oct 2012 17:36:16 -0700
Subject: Correctly adjust clip regions that lie offscreen

We were clamping the x/y location of the scissor to 0,0, but not adjusting
the width/height appropriately. This fix adjusts width/height and also clamps
them to 0 to correctly clip out offscreen operations.

Issue #7221524 Top left and top right portions of the screen blanks out after some time

Change-Id: I47f23336ea612409ed86652b9a68e272819ef00e
---
 libs/hwui/Caches.cpp | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

(limited to 'libs')

diff --git a/libs/hwui/Caches.cpp b/libs/hwui/Caches.cpp
index d18a5b0..e7085b0 100644
--- a/libs/hwui/Caches.cpp
+++ b/libs/hwui/Caches.cpp
@@ -399,9 +399,20 @@ bool Caches::setScissor(GLint x, GLint y, GLint width, GLint height) {
     if (scissorEnabled && (x != mScissorX || y != mScissorY ||
             width != mScissorWidth || height != mScissorHeight)) {
 
-        if (x < 0) x = 0;
-        if (y < 0) y = 0;
-
+        if (x < 0) {
+            width += x;
+            x = 0;
+        }
+        if (y < 0) {
+            height += y;
+            y = 0;
+        }
+        if (width < 0) {
+            width = 0;
+        }
+        if (height < 0) {
+            height = 0;
+        }
         glScissor(x, y, width, height);
 
         mScissorX = x;
-- 
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