From 6d5a826027fa96886cf0232041e8d4ac0887234f Mon Sep 17 00:00:00 2001
From: Nicolas Roard <nicolas@android.com>
Date: Mon, 28 Feb 2011 09:58:49 -0800
Subject: Cap framerate at 60fps

Change-Id: I1b6be15a38d2afc55659872b82e13ebcd8fd2ada
---
 WebCore/platform/graphics/android/BaseLayerAndroid.cpp |  1 -
 WebCore/platform/graphics/android/GLWebViewState.cpp   | 16 +++++++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

(limited to 'WebCore/platform/graphics/android')

diff --git a/WebCore/platform/graphics/android/BaseLayerAndroid.cpp b/WebCore/platform/graphics/android/BaseLayerAndroid.cpp
index 2166e9d..584add1 100644
--- a/WebCore/platform/graphics/android/BaseLayerAndroid.cpp
+++ b/WebCore/platform/graphics/android/BaseLayerAndroid.cpp
@@ -334,7 +334,6 @@ bool BaseLayerAndroid::drawGL(IntRect& viewRect, SkRect& visibleRect,
         TilesManager::instance()->cleanupLayersTextures(0);
     }
 
-    glFinish();
     glBindBuffer(GL_ARRAY_BUFFER, 0);
     m_previousVisible = visibleRect;
 
diff --git a/WebCore/platform/graphics/android/GLWebViewState.cpp b/WebCore/platform/graphics/android/GLWebViewState.cpp
index b3c5b02..3ca04e9 100644
--- a/WebCore/platform/graphics/android/GLWebViewState.cpp
+++ b/WebCore/platform/graphics/android/GLWebViewState.cpp
@@ -32,11 +32,11 @@
 #include "ClassTracker.h"
 #include "LayerAndroid.h"
 #include "TilesManager.h"
+#include <wtf/CurrentTime.h>
 
 #ifdef DEBUG
 
 #include <cutils/log.h>
-#include <wtf/CurrentTime.h>
 #include <wtf/text/CString.h>
 
 #undef XLOG
@@ -52,6 +52,8 @@
 #define FIRST_TILED_PAGE_ID 1
 #define SECOND_TILED_PAGE_ID 2
 
+#define FRAMERATE_CAP 0.01666 // We cap at 60 fps
+
 namespace WebCore {
 
 using namespace android;
@@ -299,8 +301,20 @@ void GLWebViewState::setViewport(SkRect& viewport, float scale)
     m_tiledPageB->updateBaseTileSize();
 }
 
+static double gPrevTime = 0;
+
 bool GLWebViewState::drawGL(IntRect& rect, SkRect& viewport, float scale, SkColor color)
 {
+    glFinish();
+
+    double currentTime = WTF::currentTime();
+    double delta = currentTime - gPrevTime;
+
+    if (delta < FRAMERATE_CAP)
+        return true;
+
+    gPrevTime = currentTime;
+
     m_baseLayerLock.lock();
     BaseLayerAndroid* baseLayer = m_currentBaseLayer;
     SkSafeRef(baseLayer);
-- 
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