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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef SCREENRECORD_EGL_WINDOW_H
     18 #define SCREENRECORD_EGL_WINDOW_H
     19 
     20 #include <gui/BufferQueue.h>
     21 #include <utils/Errors.h>
     22 
     23 #include <EGL/egl.h>
     24 
     25 namespace android {
     26 
     27 /*
     28  * Wraps EGL display, context, surface, config for a window surface.
     29  *
     30  * Not thread safe.
     31  */
     32 class EglWindow {
     33 public:
     34     EglWindow() :
     35         mEglDisplay(EGL_NO_DISPLAY),
     36         mEglContext(EGL_NO_CONTEXT),
     37         mEglSurface(EGL_NO_SURFACE),
     38         mEglConfig(NULL),
     39         mWidth(0),
     40         mHeight(0)
     41         {}
     42     ~EglWindow() { eglRelease(); }
     43 
     44     // Creates an EGL window for the supplied surface.
     45     status_t createWindow(const sp<IGraphicBufferProducer>& surface);
     46 
     47     // Creates an EGL pbuffer surface.
     48     status_t createPbuffer(int width, int height);
     49 
     50     // Return width and height values (obtained from IGBP).
     51     int getWidth() const { return mWidth; }
     52     int getHeight() const { return mHeight; }
     53 
     54     // Release anything we created.
     55     void release() { eglRelease(); }
     56 
     57     // Make this context current.
     58     status_t makeCurrent() const;
     59 
     60     // Sets the presentation time on the current EGL buffer.
     61     void presentationTime(nsecs_t whenNsec) const;
     62 
     63     // Swaps the EGL buffer.
     64     void swapBuffers() const;
     65 
     66 private:
     67     EglWindow(const EglWindow&);
     68     EglWindow& operator=(const EglWindow&);
     69 
     70     // Init display, create config and context.
     71     status_t eglSetupContext(bool forPbuffer);
     72     void eglRelease();
     73 
     74     // Basic EGL goodies.
     75     EGLDisplay mEglDisplay;
     76     EGLContext mEglContext;
     77     EGLSurface mEglSurface;
     78     EGLConfig mEglConfig;
     79 
     80     // Surface dimensions.
     81     int mWidth;
     82     int mHeight;
     83 };
     84 
     85 }; // namespace android
     86 
     87 #endif /*SCREENRECORD_EGL_WINDOW_H*/
     88