本文整理汇总了Java中javax.microedition.khronos.opengles.GL10.glReadPixels方法的典型用法代码示例。如果您正苦于以下问题：Java GL10.glReadPixels方法的具体用法？Java GL10.glReadPixels怎么用？Java GL10.glReadPixels使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类javax.microedition.khronos.opengles.GL10的用法示例。
在下文中一共展示了GL10.glReadPixels方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: takeScreenSnapshot
import javax.microedition.khronos.opengles.GL10; //导入方法依赖的package包/类
public Bitmap takeScreenSnapshot(GL10 gl) {
int width = (int) mdChartWindowWidth;
int height = (int) mdChartWindowHeight;
int screenshotSize = width * height;
int pixelsBuffer[] = new int[screenshotSize];
try {
ByteBuffer bb = ByteBuffer.allocateDirect(screenshotSize * 4);
bb.order(ByteOrder.nativeOrder());
// this statement does not work in the landscape mode of galaxy express. Seems that it cannot support so large height (lines).
//gl.glReadPixels(0, 0, width, height, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, bb);
gl.glReadPixels(0, 0, width, height/2, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, bb);
bb.asIntBuffer().get(pixelsBuffer);
gl.glReadPixels(0, height/2, width, height/2, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, bb);
int pixelsBufferBottom[] = new int[screenshotSize];
bb.asIntBuffer().get(pixelsBufferBottom);
for (int idx = screenshotSize/2; idx < screenshotSize; idx ++) {
pixelsBuffer[idx] = pixelsBufferBottom[idx - screenshotSize/2];
}
bb = null;
} catch (OutOfMemoryError e) {
// ByteBuffer.allocateDirect(screenshotSize * 4); could be out of memory
// in general, OutOfMemoryError should not be handled and developer should let JVM die.
// however, in this case, we know what statement causes the out of memory error
// and other threads are not affected. So it is ok to catch it.
}
for (int i = 0; i < screenshotSize; ++i) {
// The alpha and green channels' positions are preserved while the red and blue are swapped
pixelsBuffer[i] = ((pixelsBuffer[i] & 0xff00ff00)) | ((pixelsBuffer[i] & 0x000000ff) << 16) | ((pixelsBuffer[i] & 0x00ff0000) >> 16);
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixelsBuffer, screenshotSize-width, -width, 0, 0, width, height);
return bitmap;
}