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Add Bitmap image capture capability to GlSurfaceViewRenderer.

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PiperOrigin-RevId: 512677893
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MediaPipe Team 2023-02-27 11:08:58 -08:00 committed by Copybara-Service
parent 9f59d4d01b
commit 75576700ed
1 changed files with 55 additions and 0 deletions
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55
mediapipe/java/com/google/mediapipe/components/GlSurfaceViewRenderer.java
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@ -17,6 +17,7 @@ package com.google.mediapipe.components;
import static java.lang.Math.max;
import static java.lang.Math.min;
import android.graphics.Bitmap;
import android.graphics.SurfaceTexture;
import android.opengl.GLES11Ext;
import android.opengl.GLES20;
@ -26,9 +27,12 @@ import android.util.Log;
import com.google.mediapipe.framework.TextureFrame;
import com.google.mediapipe.glutil.CommonShaders;
import com.google.mediapipe.glutil.ShaderUtil;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
@ -45,6 +49,13 @@ import javax.microedition.khronos.opengles.GL10;
* {@link TextureFrame} (call {@link #setNextFrame(TextureFrame)}).
*/
public class GlSurfaceViewRenderer implements GLSurfaceView.Renderer {
/**
* Listener for Bitmap capture requests.
*/
public interface BitmapCaptureListener {
void onBitmapCaptured(Bitmap result);
}
private static final String TAG = "DemoRenderer";
private static final int ATTRIB_POSITION = 1;
private static final int ATTRIB_TEXTURE_COORDINATE = 2;
@ -64,6 +75,25 @@ public class GlSurfaceViewRenderer implements GLSurfaceView.Renderer {
private float[] textureTransformMatrix = new float[16];
private SurfaceTexture surfaceTexture = null;
private final AtomicReference<TextureFrame> nextFrame = new AtomicReference<>();
private final AtomicBoolean captureNextFrameBitmap = new AtomicBoolean();
private BitmapCaptureListener bitmapCaptureListener;
/**
* Sets the {@link BitmapCaptureListener}.
*/
public void setBitmapCaptureListener(BitmapCaptureListener bitmapCaptureListener) {
this.bitmapCaptureListener = bitmapCaptureListener;
}
/**
* Request to capture Bitmap of the next frame.
*
* The result will be provided to the {@link BitmapCaptureListener} if one is set. Please note
* this is an expensive operation and the result may not be available for a while.
*/
public void captureNextFrameBitmap() {
captureNextFrameBitmap.set(true);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
@ -149,6 +179,31 @@ public class GlSurfaceViewRenderer implements GLSurfaceView.Renderer {
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
ShaderUtil.checkGlError("glDrawArrays");
// Capture Bitmap if requested.
BitmapCaptureListener bitmapCaptureListener = this.bitmapCaptureListener;
if (captureNextFrameBitmap.getAndSet(false) && bitmapCaptureListener != null) {
int bitmapSize = surfaceWidth * surfaceHeight;
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(bitmapSize * 4);
byteBuffer.order(ByteOrder.nativeOrder());
GLES20.glReadPixels(
0, 0, surfaceWidth, surfaceHeight, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, byteBuffer);
int[] pixelBuffer = new int[bitmapSize];
byteBuffer.asIntBuffer().get(pixelBuffer);
for (int i = 0; i < bitmapSize; i++) {
// Swap R and B channels.
pixelBuffer[i] =
(pixelBuffer[i] & 0xff00ff00)
| ((pixelBuffer[i] & 0x000000ff) << 16)
| ((pixelBuffer[i] & 0x00ff0000) >> 16);
}
Bitmap bitmap = Bitmap.createBitmap(surfaceWidth, surfaceHeight, Bitmap.Config.ARGB_8888);
bitmap.setPixels(
pixelBuffer, /* offset= */bitmapSize - surfaceWidth, /* stride= */-surfaceWidth,
/* x= */0, /* y= */0, surfaceWidth, surfaceHeight);
bitmapCaptureListener.onBitmapCaptured(bitmap);
}
GLES20.glBindTexture(textureTarget, 0);
ShaderUtil.checkGlError("unbind surfaceTexture");