So long OpenGLPipeline & OpenGLReadback (2/??)

Hello EglReadback

Test: hwuiunit & PixelCopyTests pass
Change-Id: I36a8cb45b11141b09e75a2e978ed13e336425625
diff --git a/libs/hwui/EglReadback.h b/libs/hwui/EglReadback.h
new file mode 100644
index 0000000..e723169
--- /dev/null
+++ b/libs/hwui/EglReadback.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "Readback.h"
+
+#include "Matrix.h"
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+namespace android {
+namespace uirenderer {
+
+class EglReadback : public Readback {
+public:
+    virtual CopyResult copySurfaceInto(Surface& surface, const Rect& srcRect,
+                                       SkBitmap* bitmap) override;
+    virtual CopyResult copyGraphicBufferInto(GraphicBuffer* graphicBuffer,
+                                             SkBitmap* bitmap) override;
+
+protected:
+    explicit EglReadback(renderthread::RenderThread& thread) : Readback(thread) {}
+    virtual ~EglReadback() {}
+
+    virtual CopyResult copyImageInto(EGLImageKHR eglImage, const Matrix4& imgTransform,
+                                     int imgWidth, int imgHeight, const Rect& srcRect,
+                                     SkBitmap* bitmap) = 0;
+
+private:
+    CopyResult copyGraphicBufferInto(GraphicBuffer* graphicBuffer, Matrix4& texTransform,
+                                     const Rect& srcRect, SkBitmap* bitmap);
+};
+
+}  // namespace uirenderer
+}  // namespace android