Gl resource should be re-initialized after EGL context changed

EGLContext can be re-created when memory pressure is very high, that will delete
all the GL resources automatically.
After this, we should re-create the GL resources for webView.

bug:6075574
Change-Id: I3035554d124cee38df3ba2dfae1eda0568b45d0f

4 files changed, 22 insertions, 6 deletions

diff --git a/Source/WebCore/platform/graphics/android/GLWebViewState.cpp b/Source/WebCore/platform/graphics/android/GLWebViewState.cpp
index 76d7324..86f33e0 100644
--- a/Source/WebCore/platform/graphics/android/GLWebViewState.cpp
+++ b/Source/WebCore/platform/graphics/android/GLWebViewState.cpp
@@ -351,18 +351,26 @@ double GLWebViewState::setupDrawing(const IntRect& viewRect, const SkRect& visib
     int top = viewRect.y();
     int width = viewRect.width();
     int height = viewRect.height();
+    TilesManager* tilesManager = TilesManager::instance();
+
+    // Make sure the GL Context has not changed, otherwise, re-create all GL
+    // resources. Only check this after onTrimMemory happens.
+    bool contextChanged = tilesManager->contextChanged();
+    tilesManager->setContextChanged(false);
 
     // Make sure GL resources are created on the UI thread.
-    ShaderProgram* shader = TilesManager::instance()->shader();
-    if (shader->needsInit()) {
-        XLOG("Reinit shader");
+    ShaderProgram* shader = tilesManager->shader();
+    if (shader->needsInit() || contextChanged) {
+        XLOGC("Reinit shader");
         shader->init();
     }
-    TransferQueue* transferQueue = TilesManager::instance()->transferQueue();
-    if (transferQueue->needsInit()) {
+    TransferQueue* transferQueue = tilesManager->transferQueue();
+    if (transferQueue->needsInit() || contextChanged) {
+        XLOGC("Reinit transferQueue");
         transferQueue->initGLResources(TilesManager::tileWidth(),
                                        TilesManager::tileHeight());
     }
+    // TODO: Add the video GL resource re-initialization code here.
 
     shader->setupDrawing(viewRect, visibleRect, webViewRect,
                          titleBarHeight, screenClip, scale);
diff --git a/Source/WebCore/platform/graphics/android/TilesManager.cpp b/Source/WebCore/platform/graphics/android/TilesManager.cpp
index 184d80c..6640230 100644
--- a/Source/WebCore/platform/graphics/android/TilesManager.cpp
+++ b/Source/WebCore/platform/graphics/android/TilesManager.cpp
@@ -110,6 +110,7 @@ TilesManager::TilesManager()
     , m_drawGLCount(1)
     , m_lastTimeLayersUsed(0)
     , m_hasLayerTextures(false)
+    , m_EGLContextChanged(true)
 {
     XLOG("TilesManager ctor");
     m_textures.reserveCapacity(MAX_TEXTURE_ALLOCATION);
diff --git a/Source/WebCore/platform/graphics/android/TilesManager.h b/Source/WebCore/platform/graphics/android/TilesManager.h
index b670055..749ba98 100644
--- a/Source/WebCore/platform/graphics/android/TilesManager.h
+++ b/Source/WebCore/platform/graphics/android/TilesManager.h
@@ -110,6 +110,9 @@ public:
     void setHighEndGfx(bool highEnd);
     bool highEndGfx();
 
+    bool contextChanged() { return m_EGLContextChanged; }
+    void setContextChanged(bool changed) { m_EGLContextChanged = changed; }
+
     int maxTextureCount();
     int maxLayerTextureCount();
     void setMaxTextureCount(int max);
@@ -263,6 +266,8 @@ private:
     unsigned long long m_drawGLCount;
     double m_lastTimeLayersUsed;
     bool m_hasLayerTextures;
+
+    bool m_EGLContextChanged;
 };
 
 } // namespace WebCore
diff --git a/Source/WebKit/android/nav/WebView.cpp b/Source/WebKit/android/nav/WebView.cpp
index 9e3c094..7919fdd 100644
--- a/Source/WebKit/android/nav/WebView.cpp
+++ b/Source/WebKit/android/nav/WebView.cpp
@@ -2267,8 +2267,10 @@ static void nativeOnTrimMemory(JNIEnv *env, jobject obj, jint level)
         // Texture to avoid ANR b/c framework may destroy the EGL context.
         // Refer to WindowManagerImpl.java for conditions we followed.
         if (level >= TRIM_MEMORY_MODERATE
-            && !TilesManager::instance()->highEndGfx())
+            && !TilesManager::instance()->highEndGfx()) {
             TilesManager::instance()->transferQueue()->emptyQueue();
+            TilesManager::instance()->setContextChanged(true);
+        }
 
         bool freeAllTextures = (level > TRIM_MEMORY_UI_HIDDEN), glTextures = true;
         TilesManager::instance()->discardTextures(freeAllTextures, glTextures);