Comments (3)
you can use glReadPixels api to get bitmap from gpu and save it, such as:
int width = getWidth();
int height = getHeight();
ByteBuffer buf = ByteBuffer.allocateDirect(width * height * 4);
buf.order(ByteOrder.LITTLE_ENDIAN);
GLES30.glReadPixels(0, 0, width, height,
GLES30.GL_RGBA, GLES30.GL_UNSIGNED_BYTE, buf);
OpenGLUtils.checkGlError("glReadPixels");
buf.rewind();
from caincamera.
in preview page,taking picture function is what you want。EglSurfaceBase.getCurrentFrame() is called from RenderThread.java to implement capture function and then using captureCallback.onCapture to save it,like this:
@Override
public void onCapture(final ByteBuffer buffer, final int width, final int height) {
mMainHandler.post(new Runnable() {
@Override
public void run() {
String filePath = PathConstraints.getImageCachePath(mActivity);
BitmapUtils.saveBitmap(filePath, buffer, width, height);
if (mPageListener != null) {
mPageListener.onOpenImageEditPage(filePath);
}
}
});
}
so, if you want to read pixels in GLSurfaceView, you can call queueEvent() Api to implement it,just like this:
/**
* 拍照
*/
public void getCaptureFrame(final CaptureCallback captureCallback) {
queueEvent(new Runnable() {
@Override
public void run() {
int width = getWidth();
int height = getHeight();
ByteBuffer buf = ByteBuffer.allocateDirect(width * height * 4);
buf.order(ByteOrder.LITTLE_ENDIAN);
GLES30.glReadPixels(0, 0, width, height,
GLES30.GL_RGBA, GLES30.GL_UNSIGNED_BYTE, buf);
OpenGLUtils.checkGlError("glReadPixels");
buf.rewind();
if (captureCallback != null) {
captureCallback.onCapture(buf, width, height);
}
}
});
}
then, we save picture in fragment:
/**
* 截屏回调
*/
private GLImageSurfaceView.CaptureCallback mCaptureCallback = new GLImageSurfaceView.CaptureCallback() {
@Override
public void onCapture(final ByteBuffer buffer, final int width, final int height) {
mMainHandler.post(new Runnable() {
@Override
public void run() {
String filePath = getDCIMImagePath(mActivity);
BitmapUtils.saveBitmap(filePath, buffer, width, height);
Log.d("hahaha", "run: " + filePath);
}
});
}
};
/**
* 获取图片缓存绝对路径
* @param context
* @return
*/
private static String getDCIMImagePath(Context context) {
String directoryPath;
// 判断外部存储是否可用,如果不可用则使用内部存储路径
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
directoryPath =Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath();
} else { // 使用内部存储缓存目录
directoryPath = context.getCacheDir().getAbsolutePath();
}
String path = directoryPath + File.separator + Environment.DIRECTORY_PICTURES + File.separator + "CainCamera_" + System.currentTimeMillis() + ".jpeg";
File file = new File(path);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
return path;
}
from caincamera.
you can use glReadPixels api to get bitmap from gpu and save it, such as:
int width = getWidth(); int height = getHeight(); ByteBuffer buf = ByteBuffer.allocateDirect(width * height * 4); buf.order(ByteOrder.LITTLE_ENDIAN); GLES30.glReadPixels(0, 0, width, height, GLES30.GL_RGBA, GLES30.GL_UNSIGNED_BYTE, buf); OpenGLUtils.checkGlError("glReadPixels"); buf.rewind();
do you have any tutorial for this ?
from caincamera.
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