commit 3a3133d876caf60ebff2176ad75c3dcf0259148d
author Romain Guy <romainguy@google.com> Tue Feb 01 22:59:58 2011 -0800
committer Romain Guy <romainguy@google.com> Tue Feb 01 23:01:43 2011 -0800
tree dca8a743e3e8b99eb6b7aaddba3402c82132a9c5
parent 849d0a37cf2ca6c6a6c2d4d4456495e32e363120

Update layers based on the dirty region.
Bug #3413433

This helps Launcher when a widget updates during a scroll, or when interacting
with widgets on the workspace if layers are still turned on.

Change-Id: Ic7a42eb34f74f4ae988039754f815e2efd1d1e4f

libs/hwui/LayerRenderer.cpp

diff --git a/libs/hwui/LayerRenderer.cpp b/libs/hwui/LayerRenderer.cpp
index 691f649..aebd2b7 100644
--- a/libs/hwui/LayerRenderer.cpp
+++ b/libs/hwui/LayerRenderer.cpp
@@ -16,8 +16,11 @@
 
 #define LOG_TAG "OpenGLRenderer"
 
+#include <ui/Rect.h>
+
 #include "LayerRenderer.h"
 #include "Properties.h"
+#include "Rect.h"
 
 namespace android {
 namespace uirenderer {
@@ -30,12 +33,24 @@
     LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->fbo);
 
 #if RENDER_LAYERS_AS_REGIONS
-    mLayer->region.clear();
+    Rect dirty(left, top, right, bottom);
+    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
+            dirty.right >= mLayer->width && dirty.bottom >= mLayer->height)) {
+        mLayer->region.clear();
+        dirty.set(0.0f, 0.0f, mLayer->width, mLayer->height);
+    } else {
+        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
+        mLayer->region.subtractSelf(r);
+    }
 #endif
 
     glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
 
+#if RENDER_LAYERS_AS_REGIONS
+    OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
+#else
     OpenGLRenderer::prepareDirty(0.0f, 0.0f, mLayer->width, mLayer->height, opaque);
+#endif
 }
 
 void LayerRenderer::finish() {