Expose the WebGraphicsContext3D for Android

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index dc21f2d5fcc6597bc3be170339273dfce4dd7607..3c476baed9a2f3ce70d1d162c7e82910a4f08c68 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/renderer_host/compositor_impl_android.h"
 
+#include <android/bitmap.h>
 #include <android/native_window_jni.h>
 
 #include "base/bind.h"
@@ -16,9 +17,18 @@
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/public/common/content_switches.h"
+#include "third_party/khronos/GLES2/gl2.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/Platform.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorSupport.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputSurface.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
+#include "ui/gfx/android/java_bitmap.h"
+
+
+namespace gfx {
+class JavaBitmap;
+}
 
 namespace {
 
@@ -172,6 +182,57 @@ bool CompositorImpl::CompositeAndReadback(void *pixels, const gfx::Rect& rect) {
     return false;
 }
 
+WebKit::WebGLId CompositorImpl::GenerateTexture(gfx::JavaBitmap& bitmap) {
+  unsigned int texture_id = BuildBasicTexture();
+  WebKit::WebGraphicsContext3D* context =
+      ImageTransportFactoryAndroid::GetInstance()->GetContext3D();
+  if (texture_id == 0 || context->isContextLost())
+    return 0;
+  WebKit::WebGLId format = GetGLFormatForBitmap(bitmap);
+  WebKit::WebGLId type = GetGLTypeForBitmap(bitmap);
+
+  context->texImage2D(GL_TEXTURE_2D,
+                      0,
+                      format,
+                      bitmap.size().width(),
+                      bitmap.size().height(),
+                      0,
+                      format,
+                      type,
+                      bitmap.pixels());
+  DCHECK(context->getError() == GL_NO_ERROR);
+  return texture_id;
+}
+
+WebKit::WebGLId CompositorImpl::GenerateCompressedTexture(gfx::Size& size,
+                                                          int data_size,
+                                                          void* data) {
+  unsigned int texture_id = BuildBasicTexture();
+  WebKit::WebGraphicsContext3D* context =
+        ImageTransportFactoryAndroid::GetInstance()->GetContext3D();
+  if (texture_id == 0 || context->isContextLost())
+    return 0;
+  context->compressedTexImage2D(GL_TEXTURE_2D,
+                                0,
+                                GL_ETC1_RGB8_OES,
+                                size.width(),
+                                size.height(),
+                                0,
+                                data_size,
+                                data);
+  DCHECK(context->getError() == GL_NO_ERROR);
+  return texture_id;
+}
+
+void CompositorImpl::DeleteTexture(WebKit::WebGLId texture_id) {
+  WebKit::WebGraphicsContext3D* context =
+      ImageTransportFactoryAndroid::GetInstance()->GetContext3D();
+  if (context->isContextLost())
+    return;
+  context->deleteTexture(texture_id);
+  DCHECK(context->getError() == GL_NO_ERROR);
+}
+
 void CompositorImpl::updateAnimations(double frameBeginTime) {
 }
 
@@ -221,4 +282,54 @@ void CompositorImpl::scheduleComposite() {
   client_->ScheduleComposite();
 }
 
+WebKit::WebGLId CompositorImpl::BuildBasicTexture() {
+  WebKit::WebGraphicsContext3D* context =
+            ImageTransportFactoryAndroid::GetInstance()->GetContext3D();
+  if (context->isContextLost())
+    return 0;
+  WebKit::WebGLId texture_id = context->createTexture();
+  context->bindTexture(GL_TEXTURE_2D, texture_id);
+  context->texParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  context->texParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  context->texParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  context->texParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  DCHECK(context->getError() == GL_NO_ERROR);
+  return texture_id;
+}
+
+WebKit::WGC3Denum CompositorImpl::GetGLFormatForBitmap(
+    gfx::JavaBitmap& bitmap) {
+  switch (bitmap.format()) {
+    case ANDROID_BITMAP_FORMAT_A_8:
+      return GL_ALPHA;
+      break;
+    case ANDROID_BITMAP_FORMAT_RGBA_4444:
+      return GL_RGBA;
+      break;
+    case ANDROID_BITMAP_FORMAT_RGBA_8888:
+      return GL_RGBA;
+      break;
+    case ANDROID_BITMAP_FORMAT_RGB_565:
+    default:
+      return GL_RGB;
+  }
+}
+
+WebKit::WGC3Denum CompositorImpl::GetGLTypeForBitmap(gfx::JavaBitmap& bitmap) {
+  switch (bitmap.format()) {
+    case ANDROID_BITMAP_FORMAT_A_8:
+      return GL_UNSIGNED_BYTE;
+      break;
+    case ANDROID_BITMAP_FORMAT_RGBA_4444:
+      return GL_UNSIGNED_SHORT_4_4_4_4;
+      break;
+    case ANDROID_BITMAP_FORMAT_RGBA_8888:
+      return GL_UNSIGNED_BYTE;
+      break;
+    case ANDROID_BITMAP_FORMAT_RGB_565:
+    default:
+      return GL_UNSIGNED_SHORT_5_6_5;
+  }
+}
+
 } // namespace content