[Android] GLSurfaceView 캡처 → Bitmap → JPEG 변환 후, Retrofit2 post 이미지 전송(1)

1. GLSurfaceView 캡처 → Bitmap 변환

    private Bitmap shareBitmap;
    private Bitmap tempBitmap;
    private GLSurfaceView mSurfaceView;
    private ImageView iv_capture;

    private interface BitmapReadyCallbacks { // callback
        void onBitmapReady(Bitmap bitmap);
    }

	// 얘를 실행하면 캡처
    private void captureGLSurface() {
        captureBitmap(new BitmapReadyCallbacks() {
            @Override
            public void onBitmapReady(Bitmap bitmap) {
                iv_capture.setImageBitmap(bitmap); // 캡처 set
                iv_capture.setVisibility(VISIBLE); // 캡처 확인 
                shareBitmap = bitmap; // shareBitmap 에 저장
            }
        });
    }
    
    // 캡처 로직 리턴값을 tempBitmap 에 담고 callback 으로 전달 
    private void captureBitmap(final BitmapReadyCallbacks bitmapReadyCallbacks) {
        mSurfaceView.queueEvent(new Runnable() {
            @Override
            public void run() {
                EGL10 egl = (EGL10) EGLContext.getEGL();
                GL10 gl = (GL10) egl.eglGetCurrentContext().getGL();
                tempBitmap = createBitmapFromGLSurface(0, 0, mSurfaceView.getWidth(), mSurfaceView.getHeight(), gl);

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        bitmapReadyCallbacks.onBitmapReady(tempBitmap);
                    }
                });
            }
        });
    }
    
    // 캡처 로직
    private Bitmap createBitmapFromGLSurface(int x, int y, int w, int h, GL10 gl) {
        int bitmapBuffer[] = new int[w * h];
        int bitmapSource[] = new int[w * h];
        IntBuffer intBuffer = IntBuffer.wrap(bitmapBuffer);
        intBuffer.position(0);

        try {
            gl.glReadPixels(x, y, w, h, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, intBuffer);
            int offset1, offset2;
            for (int i = 0; i < h; i++) {
                offset1 = i * w;
                offset2 = (h - i - 1) * w;
                for (int j = 0; j < w; j++) {
                    int texturePixel = bitmapBuffer[offset1 + j];
                    int blue = (texturePixel >> 16) & 0xff;
                    int red = (texturePixel << 16) & 0x00ff0000;
                    int pixel = (texturePixel & 0xff00ff00) | red | blue;
                    bitmapSource[offset2 + j] = pixel;
                }
            }
        } catch (GLException e) {
            return null;
        }
        return Bitmap.createBitmap(bitmapSource, w, h, Bitmap.Config.ARGB_8888);
    }

 

2. Bitmap → JPEG 변환

1번에서 저장한 shareBitmap 을 JPEG 으로 변환

        Bitmap bitmap = shareBitmap;
        File file = new File(getContext().getCacheDir(), "file_name.jpeg");
        
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
        byte[] bitmapData = bos.toByteArray();

        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        try {
            fos.write(bitmapData);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

JPEG 으로 변환된 FILE 을 POST해보자(2부로 ~)

 

 

참고 - Stack Overflow