aw: Force auxiliary bitmap on android emulators

Android emulators miss many EGL extensions required for
webview hardware accelerated rendering, so fallback to
a slow software mode when running in emulator.

BUG=490354

Review URL: https://codereview.chromium.org/1145273003

Cr-Commit-Position: refs/heads/master@{#330811}

android_webview/java/src/org/chromium/android_webview/AwContents.java

@@ -100,6 +100,9 @@ public class AwContents implements SmartClipProvider,
     // produce little visible difference.
     private static final float ZOOM_CONTROLS_EPSILON = 0.007f;
 
+    private static final boolean FORCE_AUXILIARY_BITMAP_RENDERING =
+            "goldfish".equals(Build.HARDWARE);
+
     /**
      * WebKit hit test related data structure. These are used to implement
      * getHitTestResult, requestFocusNodeHref, requestImageRef methods in WebView.
@@ -1114,6 +1117,8 @@ public class AwContents implements SmartClipProvider,
 
     public static void setAwDrawSWFunctionTable(long functionTablePointer) {
         nativeSetAwDrawSWFunctionTable(functionTablePointer);
+        // Force auxiliary bitmap rendering in emulators.
+        nativeSetForceAuxiliaryBitmapRendering(FORCE_AUXILIARY_BITMAP_RENDERING);
     }
 
     public static void setAwDrawGLFunctionTable(long functionTablePointer) {
@@ -2714,7 +2719,7 @@ public class AwContents implements SmartClipProvider,
                     mContainerView.getScrollX(), mContainerView.getScrollY(),
                     globalVisibleRect.left, globalVisibleRect.top,
                     globalVisibleRect.right, globalVisibleRect.bottom);
-            if (did_draw && canvas.isHardwareAccelerated()) {
+            if (did_draw && canvas.isHardwareAccelerated() && !FORCE_AUXILIARY_BITMAP_RENDERING) {
                 did_draw = mNativeGLDelegate.requestDrawGL(canvas, false, mContainerView);
             }
             if (!did_draw) {
@@ -2990,6 +2995,8 @@ public class AwContents implements SmartClipProvider,
 
     private static native long nativeInit(AwBrowserContext browserContext);
     private static native void nativeDestroy(long nativeAwContents);
+    private static native void nativeSetForceAuxiliaryBitmapRendering(
+            boolean forceAuxiliaryBitmapRendering);
     private static native void nativeSetAwDrawSWFunctionTable(long functionTablePointer);
     private static native void nativeSetAwDrawGLFunctionTable(long functionTablePointer);
     private static native long nativeGetAwDrawGLFunction();

android_webview/native/aw_contents.cc

@@ -108,6 +108,8 @@ namespace {
 
 bool g_should_download_favicons = false;
 
+bool g_force_auxiliary_bitmap_rendering = false;
+
 const void* kAwContentsUserDataKey = &kAwContentsUserDataKey;
 
 class AwContentsUserData : public base::SupportsUserData::Data {
@@ -310,6 +312,13 @@ static jlong Init(JNIEnv* env, jclass, jobject browser_context) {
   return reinterpret_cast<intptr_t>(new AwContents(web_contents.Pass()));
 }
 
+static void SetForceAuxiliaryBitmapRendering(
+    JNIEnv* env,
+    jclass,
+    jboolean force_auxiliary_bitmap_rendering) {
+  g_force_auxiliary_bitmap_rendering = force_auxiliary_bitmap_rendering;
+}
+
 static void SetAwDrawSWFunctionTable(JNIEnv* env, jclass,
                                      jlong function_table) {
   RasterHelperSetAwDrawSWFunctionTable(
@@ -876,7 +885,8 @@ bool AwContents::OnDraw(JNIEnv* env,
   browser_view_renderer_.PrepareToDraw(
       scroll, gfx::Rect(visible_left, visible_top, visible_right - visible_left,
                         visible_bottom - visible_top));
-  if (is_hardware_accelerated && browser_view_renderer_.attached_to_window()) {
+  if (is_hardware_accelerated && browser_view_renderer_.attached_to_window() &&
+      !g_force_auxiliary_bitmap_rendering) {
     return browser_view_renderer_.OnDrawHardware();
   }
 
@@ -892,8 +902,8 @@ bool AwContents::OnDraw(JNIEnv* env,
   // bitmap). For better performance, get global visible rect, transform it
   // from screen space to view space, then intersect with the webview in
   // viewspace.  Use the resulting rect as the auxiliary bitmap.
-  scoped_ptr<SoftwareCanvasHolder> canvas_holder =
-      SoftwareCanvasHolder::Create(canvas, scroll, view_size);
+  scoped_ptr<SoftwareCanvasHolder> canvas_holder = SoftwareCanvasHolder::Create(
+      canvas, scroll, view_size, g_force_auxiliary_bitmap_rendering);
   if (!canvas_holder || !canvas_holder->GetCanvas()) {
     TRACE_EVENT_INSTANT0("android_webview", "EarlyOut_EmptySize",
                          TRACE_EVENT_SCOPE_THREAD);

android_webview/native/aw_picture.cc

@@ -33,8 +33,8 @@ jint AwPicture::GetHeight(JNIEnv* env, jobject obj) {
 void AwPicture::Draw(JNIEnv* env, jobject obj, jobject canvas) {
   const SkIRect bounds = picture_->cullRect().roundOut();
   scoped_ptr<SoftwareCanvasHolder> canvas_holder = SoftwareCanvasHolder::Create(
-      canvas, gfx::Vector2d(),
-      gfx::Size(bounds.width(), bounds.height()));
+      canvas, gfx::Vector2d(), gfx::Size(bounds.width(), bounds.height()),
+      false);
   if (!canvas_holder || !canvas_holder->GetCanvas()) {
     LOG(ERROR) << "Couldn't draw picture";
     return;

android_webview/native/java_browser_view_renderer_helper.cc

@@ -152,11 +152,15 @@ void RasterHelperSetAwDrawSWFunctionTable(AwDrawSWFunctionTable* table) {
 scoped_ptr<SoftwareCanvasHolder> SoftwareCanvasHolder::Create(
     jobject java_canvas,
     const gfx::Vector2d& scroll_correction,
-    const gfx::Size& auxiliary_bitmap_size) {
+    const gfx::Size& auxiliary_bitmap_size,
+    bool force_auxiliary_bitmap) {
   JNIEnv* env = base::android::AttachCurrentThread();
-  scoped_ptr<SoftwareCanvasHolder> holder(
-      new JavaCanvasHolder(env, java_canvas, scroll_correction));
-  if (!holder->GetCanvas()) {
+  scoped_ptr<SoftwareCanvasHolder> holder;
+  if (!force_auxiliary_bitmap) {
+    scoped_ptr<SoftwareCanvasHolder> holder(
+        new JavaCanvasHolder(env, java_canvas, scroll_correction));
+  }
+  if (!holder.get() || !holder->GetCanvas()) {
     holder.reset();
     holder.reset(new AuxiliaryCanvasHolder(env, java_canvas, scroll_correction,
                                            auxiliary_bitmap_size));

android_webview/native/java_browser_view_renderer_helper.h

@@ -22,7 +22,8 @@ class SoftwareCanvasHolder {
   static scoped_ptr<SoftwareCanvasHolder> Create(
       jobject java_canvas,
       const gfx::Vector2d& scroll_correction,
-      const gfx::Size& auxiliary_bitmap_size);
+      const gfx::Size& auxiliary_bitmap_size,
+      bool force_auxiliary_bitmap);
 
   virtual ~SoftwareCanvasHolder() {}