glReadPixels – WANGXUCHAO.CN https://www.wangxuchao.cn Sun, 17 Dec 2017 15:15:50 +0000 zh-Hans hourly 1 https://wordpress.org/?v=6.8.3 解决Android中通过glReadPixels获取像素颜色不对的问题 https://www.wangxuchao.cn/%e8%a7%a3%e5%86%b3android%e4%b8%ad%e9%80%9a%e8%bf%87glreadpixels%e8%8e%b7%e5%8f%96%e7%9a%84%e9%a2%9c%e8%89%b2%e4%b8%8d%e5%af%b9%e7%9a%84%e9%97%ae%e9%a2%98/ Sun, 29 Oct 2017 20:00:41 +0000 http://www.wangxuchao.cn/?p=17 继续阅读“解决Android中通过glReadPixels获取像素颜色不对的问题”

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if (YayoGameMidlet.shotScreen) {
// GL to Android Bitmap Color Modifier values.
final float[] cmVals = {
0, 0, 1, 0, 0,
0, 1, 0, 0, 0,
1, 0, 0, 0, 0,
0, 0, 0, 1, 0,
};

// Collect the pixels from the GLSurfaceView.
int x = 0;
int y = 0;
int w = YayoGameMidlet.screenWidth;
int h = YayoGameMidlet.screenHeight;
int[] pix = new int[w * h];
IntBuffer PixelBuffer = IntBuffer.wrap(pix);
PixelBuffer.position(0);
gl.glReadPixels(x, y, w, h, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, PixelBuffer);
Bitmap glBitmap = Bitmap.createBitmap(pix, w, h, Bitmap.Config.ARGB_8888);
PixelBuffer = null;
pix = null;

// Translate pixel colors to make them android compatible.
Paint paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(new ColorMatrix(cmVals)));
Bitmap newImage = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newImage);
canvas.drawBitmap(glBitmap, 0, 0, paint);
glBitmap.recycle();
glBitmap = null;

// Generate the overlay from the modified pixels with the help of a matrix.
Matrix matrix = new Matrix();
matrix.preScale(1.0f, -1.0f); // Vertical flip.
YayoGameMidlet.screenBmp = Bitmap.createBitmap(newImage, 0, 0, newImage.getWidth(), newImage.getHeight(), matrix, true);
newImage.recycle();
newImage = null;

// Done capturing overlay.
YayoGameMidlet.shotScreen = false;
}

参考链接

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