commit 20adb6ce4d52b15472e7e5ee953e06cc349a827c
author henry.uh_chen <henry.uh_chen@htc.com> Wed Jul 02 19:36:56 2014 +0800
committer Chen Henry <henry.uh_chen@htc.com> Thu Jul 03 09:58:31 2014 +0000
tree 8078a58d1ce1175995c18253a6d7f6c70bcd94b7
parent 1dc550fa7333257a130d71866be37181f8ee553b

[HWUI]: fix residual line on FrameBuffer

Symptom: If app applies animation to enlarge a bitmap, there will be an residual
         line on the screen

Root Cause: On platform which has Tile Rendering implementation (ex. Qualcomm
            CPU), startTiling() call will restrict the framebuffer region which
            GPU can affect. So the expansion of clear region by 1 will not take
            effect if startTiling region is not expanded.

Solution: Expand the startTiling region by 1, too.

Reproduce steps: Apply animation to enlarge (and then shrink) a bitmap icon.

Change-Id: I7b4a59e180daa29dbe909d9e11f4093ae1d7396f

libs/hwui/OpenGLRenderer.cpp

diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
old mode 100644
new mode 100755
index 4d76bed..ee4a054
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -283,21 +283,34 @@
     }
 }
 
-void OpenGLRenderer::startTiling(const sp<Snapshot>& s, bool opaque) {
+void OpenGLRenderer::startTiling(const sp<Snapshot>& s, bool opaque, bool expand) {
     if (!mSuppressTiling) {
         Rect* clip = &mTilingClip;
         if (s->flags & Snapshot::kFlagFboTarget) {
             clip = &(s->layer->clipRect);
         }
 
-        startTiling(*clip, s->height, opaque);
+        startTiling(*clip, s->height, opaque, expand);
     }
 }
 
-void OpenGLRenderer::startTiling(const Rect& clip, int windowHeight, bool opaque) {
+void OpenGLRenderer::startTiling(const Rect& clip, int windowHeight, bool opaque, bool expand) {
     if (!mSuppressTiling) {
-        mCaches.startTiling(clip.left, windowHeight - clip.bottom,
+        if(expand) {
+            // Expand the startTiling region by 1
+            int leftNotZero = (clip.left > 0) ? 1 : 0;
+            int topNotZero = (windowHeight - clip.bottom > 0) ? 1 : 0;
+
+            mCaches.startTiling(
+                clip.left - leftNotZero,
+                windowHeight - clip.bottom - topNotZero,
+                clip.right - clip.left + leftNotZero + 1,
+                clip.bottom - clip.top + topNotZero + 1,
+                opaque);
+        } else {
+            mCaches.startTiling(clip.left, windowHeight - clip.bottom,
                 clip.right - clip.left, clip.bottom - clip.top, opaque);
+        }
     }
 }
 
@@ -1003,7 +1016,8 @@
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
             layer->getTexture(), 0);
 
-    startTiling(mSnapshot, true);
+    // Expand the startTiling region by 1
+    startTiling(mSnapshot, true, true);
 
     // Clear the FBO, expand the clear region by 1 to get nice bilinear filtering
     mCaches.enableScissor();