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Remove EglSurface usages

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egloo2
Mattia Iavarone 5 years ago
parent 3fddd80d5b
commit 4f7e1366aa
4 changed files with 1 additions and 689 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 243
      cameraview/src/main/java/com/otaliastudios/cameraview/internal/egl/EglBaseSurface.java
  2. 364
      cameraview/src/main/java/com/otaliastudios/cameraview/internal/egl/EglCore.java
  3. 80
      cameraview/src/main/java/com/otaliastudios/cameraview/internal/egl/EglWindowSurface.java
  4. 3
      cameraview/src/main/java/com/otaliastudios/cameraview/picture/SnapshotGlPictureRecorder.java

243
cameraview/src/main/java/com/otaliastudios/cameraview/internal/egl/EglBaseSurface.java
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/*
* Copyright 2013 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.otaliastudios.cameraview.internal.egl;
import android.graphics.Bitmap;
import android.opengl.EGL14;
import android.opengl.EGLSurface;
import android.opengl.GLES20;
import android.os.Build;
import androidx.annotation.RequiresApi;
import android.util.Log;
import com.otaliastudios.cameraview.CameraLogger;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* Common base class for EGL surfaces.
* <p>
* There can be multiple surfaces associated with a single context.
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public class EglBaseSurface {
protected static final String TAG = EglBaseSurface.class.getSimpleName();
private final static CameraLogger LOG = CameraLogger.create(TAG);
// EglCore object we're associated with. It may be associated with multiple surfaces.
protected EglCore mEglCore;
private EGLSurface mEGLSurface = EGL14.EGL_NO_SURFACE;
private int mWidth = -1;
private int mHeight = -1;
public EglBaseSurface(EglCore eglCore) {
mEglCore = eglCore;
}
/**
* Creates a window surface.
* <p>
* @param surface May be a Surface or SurfaceTexture.
*/
public void createWindowSurface(Object surface) {
if (mEGLSurface != EGL14.EGL_NO_SURFACE) {
throw new IllegalStateException("surface already created");
}
mEGLSurface = mEglCore.createWindowSurface(surface);
// Don't cache width/height here, because the size of the underlying surface can change
// out from under us (see e.g. HardwareScalerActivity).
//mWidth = mEglCore.querySurface(mEGLSurface, EGL14.EGL_WIDTH);
//mHeight = mEglCore.querySurface(mEGLSurface, EGL14.EGL_HEIGHT);
}
/**
* Creates an off-screen surface.
*/
public void createOffscreenSurface(int width, int height) {
if (mEGLSurface != EGL14.EGL_NO_SURFACE) {
throw new IllegalStateException("surface already created");
}
mEGLSurface = mEglCore.createOffscreenSurface(width, height);
mWidth = width;
mHeight = height;
}
/**
* Returns the surface's width, in pixels.
* <p>
* If this is called on a window surface, and the underlying surface is in the process
* of changing size, we may not see the new size right away (e.g. in the "surfaceChanged"
* callback). The size should match after the next buffer swap.
*/
public int getWidth() {
if (mWidth < 0) {
return mEglCore.querySurface(mEGLSurface, EGL14.EGL_WIDTH);
} else {
return mWidth;
}
}
/**
* Returns the surface's height, in pixels.
*/
public int getHeight() {
if (mHeight < 0) {
return mEglCore.querySurface(mEGLSurface, EGL14.EGL_HEIGHT);
} else {
return mHeight;
}
}
/**
* Release the EGL surface.
*/
public void releaseEglSurface() {
mEglCore.releaseSurface(mEGLSurface);
mEGLSurface = EGL14.EGL_NO_SURFACE;
mWidth = mHeight = -1;
}
/**
* Makes our EGL context and surface current.
*/
public void makeCurrent() {
mEglCore.makeCurrent(mEGLSurface);
}
/**
* Makes our EGL context and surface current for drawing, using the supplied surface
* for reading.
*/
public void makeCurrentReadFrom(EglBaseSurface readSurface) {
mEglCore.makeCurrent(mEGLSurface, readSurface.mEGLSurface);
}
/**
* Calls eglSwapBuffers. Use this to "publish" the current frame.
*
* @return false on failure
*/
public boolean swapBuffers() {
boolean result = mEglCore.swapBuffers(mEGLSurface);
if (!result) {
Log.d(TAG, "WARNING: swapBuffers() failed");
}
return result;
}
/**
* Sends the presentation time stamp to EGL.
* https://www.khronos.org/registry/EGL/extensions/ANDROID/EGL_ANDROID_presentation_time.txt
*
* @param nsecs Timestamp, in nanoseconds.
*/
public void setPresentationTime(long nsecs) {
mEglCore.setPresentationTime(mEGLSurface, nsecs);
}
/**
* Saves the EGL surface to a file.
* <p>
* Expects that this object's EGL surface is current.
*/
public void saveFrameToFile(File file) throws IOException {
if (!mEglCore.isCurrent(mEGLSurface)) {
throw new RuntimeException("Expected EGL context/surface is not current");
}
// glReadPixels fills in a "direct" ByteBuffer with what is essentially big-endian RGBA
// data (i.e. a byte of red, followed by a byte of green...). While the Bitmap
// constructor that takes an int[] wants little-endian ARGB (blue/red swapped), the
// Bitmap "copy pixels" method wants the same format GL provides.
//
// Ideally we'd have some way to re-use the ByteBuffer, especially if we're calling
// here often.
//
// Making this even more interesting is the upside-down nature of GL, which means
// our output will look upside down relative to what appears on screen if the
// typical GL conventions are used.
String filename = file.toString();
int width = getWidth();
int height = getHeight();
ByteBuffer buf = ByteBuffer.allocateDirect(width * height * 4);
buf.order(ByteOrder.LITTLE_ENDIAN);
GLES20.glReadPixels(0, 0, width, height,
GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buf);
Egloo.checkGlError("glReadPixels");
buf.rewind();
BufferedOutputStream bos = null;
try {
bos = new BufferedOutputStream(new FileOutputStream(filename));
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bmp.copyPixelsFromBuffer(buf);
bmp.compress(Bitmap.CompressFormat.PNG, 90, bos);
bmp.recycle();
} finally {
if (bos != null) bos.close();
}
}
/**
* Saves the EGL surface to given format.
* <p>
* Expects that this object's EGL surface is current.
*/
public byte[] saveFrameTo(Bitmap.CompressFormat compressFormat) {
if (!mEglCore.isCurrent(mEGLSurface)) {
throw new RuntimeException("Expected EGL context/surface is not current");
}
// glReadPixels fills in a "direct" ByteBuffer with what is essentially big-endian RGBA
// data (i.e. a byte of red, followed by a byte of green...). While the Bitmap
// constructor that takes an int[] wants little-endian ARGB (blue/red swapped), the
// Bitmap "copy pixels" method wants the same format GL provides.
//
// Ideally we'd have some way to re-use the ByteBuffer, especially if we're calling
// here often.
//
// Making this even more interesting is the upside-down nature of GL, which means
// our output will look upside down relative to what appears on screen if the
// typical GL conventions are used.
int width = getWidth();
int height = getHeight();
ByteBuffer buf = ByteBuffer.allocateDirect(width * height * 4);
buf.order(ByteOrder.LITTLE_ENDIAN);
GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE,
buf);
Egloo.checkGlError("glReadPixels");
buf.rewind();
ByteArrayOutputStream bos = new ByteArrayOutputStream(buf.array().length);
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bmp.copyPixelsFromBuffer(buf);
bmp.compress(compressFormat, 90, bos);
bmp.recycle();
return bos.toByteArray();
}
}

364
cameraview/src/main/java/com/otaliastudios/cameraview/internal/egl/EglCore.java
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@ -1,364 +0,0 @@
/*
* Copyright 2013 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.otaliastudios.cameraview.internal.egl;
import android.graphics.SurfaceTexture;
import android.opengl.EGL14;
import android.opengl.EGLConfig;
import android.opengl.EGLContext;
import android.opengl.EGLDisplay;
import android.opengl.EGLExt;
import android.opengl.EGLSurface;
import android.os.Build;
import androidx.annotation.RequiresApi;
import android.util.Log;
import android.view.Surface;
/**
* -- from grafika --
*
* Core EGL state (display, context, config).
* <p>
* The EGLContext must only be attached to one thread at a time. This class is not thread-safe.
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public final class EglCore {
private static final String TAG = EglCore.class.getSimpleName();
/**
* Constructor flag: surface must be recordable. This discourages EGL from using a
* pixel format that cannot be converted efficiently to something usable by the video
* encoder.
*/
public static final int FLAG_RECORDABLE = 0x01;
/**
* Constructor flag: ask for GLES3, fall back to GLES2 if not available. Without this
* flag, GLES2 is used.
*/
public static final int FLAG_TRY_GLES3 = 0x02;
// Android-specific extension.
private static final int EGL_RECORDABLE_ANDROID = 0x3142;
private EGLDisplay mEGLDisplay = EGL14.EGL_NO_DISPLAY;
private EGLContext mEGLContext = EGL14.EGL_NO_CONTEXT;
private EGLConfig mEGLConfig = null;
private int mGlVersion = -1;
/**
* Prepares EGL display and context.
* <p>
* Equivalent to EglCore(null, 0).
*/
public EglCore() {
this(null, 0);
}
/**
* Prepares EGL display and context.
* <p>
* @param sharedContext The context to share, or null if sharing is not desired.
* @param flags Configuration bit flags, e.g. FLAG_RECORDABLE.
*/
public EglCore(EGLContext sharedContext, int flags) {
if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
throw new RuntimeException("EGL already set up");
}
if (sharedContext == null) {
sharedContext = EGL14.EGL_NO_CONTEXT;
}
mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
throw new RuntimeException("unable to get EGL14 display");
}
int[] version = new int[2];
if (!EGL14.eglInitialize(mEGLDisplay, version, 0, version, 1)) {
mEGLDisplay = null;
throw new RuntimeException("unable to initialize EGL14");
}
// Try to get a GLES3 context, if requested.
if ((flags & FLAG_TRY_GLES3) != 0) {
//Log.d(TAG, "Trying GLES 3");
EGLConfig config = getConfig(flags, 3);
if (config != null) {
int[] attrib3_list = {
EGL14.EGL_CONTEXT_CLIENT_VERSION, 3,
EGL14.EGL_NONE
};
EGLContext context = EGL14.eglCreateContext(mEGLDisplay, config, sharedContext,
attrib3_list, 0);
if (EGL14.eglGetError() == EGL14.EGL_SUCCESS) {
//Log.d(TAG, "Got GLES 3 config");
mEGLConfig = config;
mEGLContext = context;
mGlVersion = 3;
}
}
}
if (mEGLContext == EGL14.EGL_NO_CONTEXT) { // GLES 2 only, or GLES 3 attempt failed
//Log.d(TAG, "Trying GLES 2");
EGLConfig config = getConfig(flags, 2);
if (config == null) {
throw new RuntimeException("Unable to find a suitable EGLConfig");
}
int[] attrib2_list = {
EGL14.EGL_CONTEXT_CLIENT_VERSION, 2,
EGL14.EGL_NONE
};
EGLContext context = EGL14.eglCreateContext(mEGLDisplay, config, sharedContext,
attrib2_list, 0);
checkEglError("eglCreateContext");
mEGLConfig = config;
mEGLContext = context;
mGlVersion = 2;
}
// Confirm with query.
int[] values = new int[1];
EGL14.eglQueryContext(mEGLDisplay, mEGLContext, EGL14.EGL_CONTEXT_CLIENT_VERSION,
values, 0);
// Log.d(TAG, "EGLContext created, client version " + values[0]);
}
/**
* Finds a suitable EGLConfig.
*
* @param flags Bit flags from constructor.
* @param version Must be 2 or 3.
*/
private EGLConfig getConfig(int flags, int version) {
int renderableType = EGL14.EGL_OPENGL_ES2_BIT;
if (version >= 3) {
renderableType |= EGLExt.EGL_OPENGL_ES3_BIT_KHR;
}
// The actual surface is generally RGBA or RGBX, so situationally omitting alpha
// doesn't really help. It can also lead to a huge performance hit on glReadPixels()
// when reading into a GL_RGBA buffer.
int[] attribList = {
EGL14.EGL_RED_SIZE, 8,
EGL14.EGL_GREEN_SIZE, 8,
EGL14.EGL_BLUE_SIZE, 8,
EGL14.EGL_ALPHA_SIZE, 8,
//EGL14.EGL_DEPTH_SIZE, 16,
//EGL14.EGL_STENCIL_SIZE, 8,
EGL14.EGL_RENDERABLE_TYPE, renderableType,
EGL14.EGL_NONE, 0, // placeholder for recordable [@-3]
EGL14.EGL_NONE
};
if ((flags & FLAG_RECORDABLE) != 0) {
attribList[attribList.length - 3] = EGL_RECORDABLE_ANDROID;
attribList[attribList.length - 2] = 1;
}
EGLConfig[] configs = new EGLConfig[1];
int[] numConfigs = new int[1];
if (!EGL14.eglChooseConfig(mEGLDisplay, attribList, 0, configs, 0,
configs.length, numConfigs, 0)) {
Log.w(TAG, "unable to find RGB8888 / " + version + " EGLConfig");
return null;
}
return configs[0];
}
/**
* Discards all resources held by this class, notably the EGL context. This must be
* called from the thread where the context was created.
* <p>
* On completion, no context will be current.
*/
public void release() {
if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
// Android is unusual in that it uses a reference-counted EGLDisplay. So for
// every eglInitialize() we need an eglTerminate().
EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
EGL14.EGL_NO_CONTEXT);
EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);
EGL14.eglReleaseThread();
EGL14.eglTerminate(mEGLDisplay);
}
mEGLDisplay = EGL14.EGL_NO_DISPLAY;
mEGLContext = EGL14.EGL_NO_CONTEXT;
mEGLConfig = null;
}
@Override
protected void finalize() throws Throwable {
try {
if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
// We're limited here -- finalizers don't run on the thread that holds
// the EGL state, so if a surface or context is still current on another
// thread we can't fully release it here. Exceptions thrown from here
// are quietly discarded. Complain in the log file.
Log.w(TAG, "WARNING: EglCore was not explicitly released! " +
"State may be leaked");
release();
}
} finally {
super.finalize();
}
}
/**
* Destroys the specified surface. Note the EGLSurface won't actually be destroyed if it's
* still current in a context.
*/
public void releaseSurface(EGLSurface eglSurface) {
EGL14.eglDestroySurface(mEGLDisplay, eglSurface);
}
/**
* Creates an EGL surface associated with a Surface.
* <p>
* If this is destined for MediaCodec, the EGLConfig should have the "recordable" attribute.
*/
public EGLSurface createWindowSurface(Object surface) {
if (!(surface instanceof Surface) && !(surface instanceof SurfaceTexture)) {
throw new RuntimeException("invalid surface: " + surface);
}
// Create a window surface, and attach it to the Surface we received.
int[] surfaceAttribs = {
EGL14.EGL_NONE
};
EGLSurface eglSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, mEGLConfig, surface,
surfaceAttribs, 0);
checkEglError("eglCreateWindowSurface");
if (eglSurface == null) {
throw new RuntimeException("surface was null");
}
return eglSurface;
}
/**
* Creates an EGL surface associated with an offscreen buffer.
*/
public EGLSurface createOffscreenSurface(int width, int height) {
int[] surfaceAttribs = {
EGL14.EGL_WIDTH, width,
EGL14.EGL_HEIGHT, height,
EGL14.EGL_NONE
};
EGLSurface eglSurface = EGL14.eglCreatePbufferSurface(mEGLDisplay, mEGLConfig,
surfaceAttribs, 0);
checkEglError("eglCreatePbufferSurface");
if (eglSurface == null) {
throw new RuntimeException("surface was null");
}
return eglSurface;
}
/**
* Makes our EGL context current, using the supplied surface for both "draw" and "read".
*/
public void makeCurrent(EGLSurface eglSurface) {
if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
// called makeCurrent() before create?
// Log.d(TAG, "NOTE: makeCurrent w/o display");
}
if (!EGL14.eglMakeCurrent(mEGLDisplay, eglSurface, eglSurface, mEGLContext)) {
throw new RuntimeException("eglMakeCurrent failed");
}
}
/**
* Makes our EGL context current, using the supplied "draw" and "read" surfaces.
*/
public void makeCurrent(EGLSurface drawSurface, EGLSurface readSurface) {
if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
// called makeCurrent() before create?
Log.d(TAG, "NOTE: makeCurrent w/o display");
}
if (!EGL14.eglMakeCurrent(mEGLDisplay, drawSurface, readSurface, mEGLContext)) {
throw new RuntimeException("eglMakeCurrent(draw,read) failed");
}
}
/**
* Makes no context current.
*/
public void makeNothingCurrent() {
if (!EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
EGL14.EGL_NO_CONTEXT)) {
throw new RuntimeException("eglMakeCurrent failed");
}
}
/**
* Calls eglSwapBuffers. Use this to "publish" the current frame.
*
* @return false on failure
*/
public boolean swapBuffers(EGLSurface eglSurface) {
return EGL14.eglSwapBuffers(mEGLDisplay, eglSurface);
}
/**
* Sends the presentation time stamp to EGL. Time is expressed in nanoseconds.
* https://www.khronos.org/registry/EGL/extensions/ANDROID/EGL_ANDROID_presentation_time.txt
*/
public void setPresentationTime(EGLSurface eglSurface, long nsecs) {
EGLExt.eglPresentationTimeANDROID(mEGLDisplay, eglSurface, nsecs);
}
/**
* Returns true if our context and the specified surface are current.
*/
public boolean isCurrent(EGLSurface eglSurface) {
return mEGLContext.equals(EGL14.eglGetCurrentContext()) &&
eglSurface.equals(EGL14.eglGetCurrentSurface(EGL14.EGL_DRAW));
}
/**
* Performs a simple surface query.
*/
public int querySurface(EGLSurface eglSurface, int what) {
int[] value = new int[1];
EGL14.eglQuerySurface(mEGLDisplay, eglSurface, what, value, 0);
return value[0];
}
/**
* Queries a string value.
*/
public String queryString(int what) {
return EGL14.eglQueryString(mEGLDisplay, what);
}
/**
* Returns the GLES version this context is configured for (currently 2 or 3).
*/
public int getGlVersion() {
return mGlVersion;
}
/**
* Checks for EGL errors. Throws an exception if an error has been raised.
*/
private void checkEglError(String msg) {
int error;
if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS) {
throw new RuntimeException(msg + ": EGL error: 0x" + Integer.toHexString(error));
}
}
}

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cameraview/src/main/java/com/otaliastudios/cameraview/internal/egl/EglWindowSurface.java
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@ -1,80 +0,0 @@
/*
* Copyright 2013 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.otaliastudios.cameraview.internal.egl;
import android.graphics.SurfaceTexture;
import android.os.Build;
import androidx.annotation.RequiresApi;
import android.view.Surface;
/**
* Recordable EGL window surface.
* <p>
* It's good practice to explicitly release() the surface, preferably from a "finally" block.
*/
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
public class EglWindowSurface extends EglBaseSurface {
private Surface mSurface;
private boolean mReleaseSurface;
/**
* Associates an EGL surface with the native window surface.
* <p>
* Set releaseSurface to true if you want the Surface to be released when release() is
* called. This is convenient, but can interfere with framework classes that expect to
* manage the Surface themselves (e.g. if you release a SurfaceView's Surface, the
* surfaceDestroyed() callback won't fire).
*/
public EglWindowSurface(EglCore eglCore, Surface surface, boolean releaseSurface) {
super(eglCore);
createWindowSurface(surface);
mSurface = surface;
mReleaseSurface = releaseSurface;
}
/**
* Associates an EGL surface with the SurfaceTexture.
*/
public EglWindowSurface(EglCore eglCore, SurfaceTexture surfaceTexture) {
super(eglCore);
createWindowSurface(surfaceTexture);
}
/**
* Associates an EGL surface with the Surface.
*/
public EglWindowSurface(EglCore eglCore, Surface surface) {
super(eglCore);
createWindowSurface(surface);
}
/**
* Releases any resources associated with the EGL surface (and, if configured to do so,
* with the Surface as well).
* <p>
* Does not require that the surface's EGL context be current.
*/
public void release() {
releaseEglSurface();
if (mSurface != null) {
if (mReleaseSurface) {
mSurface.release();
}
mSurface = null;
}
}
}

3
cameraview/src/main/java/com/otaliastudios/cameraview/picture/SnapshotGlPictureRecorder.java
Unescape View File

@ -11,7 +11,6 @@ import android.os.Build;
import com.otaliastudios.cameraview.PictureResult; import com.otaliastudios.cameraview.PictureResult;
import com.otaliastudios.cameraview.internal.GlTextureDrawer; import com.otaliastudios.cameraview.internal.GlTextureDrawer;
import com.otaliastudios.cameraview.internal.egl.EglBaseSurface;
import com.otaliastudios.cameraview.overlay.Overlay; import com.otaliastudios.cameraview.overlay.Overlay;
import com.otaliastudios.cameraview.controls.Facing; import com.otaliastudios.cameraview.controls.Facing;
import com.otaliastudios.cameraview.engine.CameraEngine; import com.otaliastudios.cameraview.engine.CameraEngine;
@ -46,7 +45,7 @@ import android.view.Surface;
* - We move to another thread, and create a new EGL surface for that EGL context. * - We move to another thread, and create a new EGL surface for that EGL context.
* - We make this new surface current, and re-draw the textureId on it * - We make this new surface current, and re-draw the textureId on it
* - [Optional: fill the overlayTextureId and draw it on the same surface] * - [Optional: fill the overlayTextureId and draw it on the same surface]
* - We use glReadPixels (through {@link EglBaseSurface#saveFrameTo(Bitmap.CompressFormat)}) * - We use glReadPixels (through {@link EglSurface#toByteArray(Bitmap.CompressFormat)})
* and save to file. * and save to file.
* *
* We create a new EGL surface and redraw the frame because: * We create a new EGL surface and redraw the frame because:

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