Develop Reference

How to draw objects on TextureView Camera stream preview and record the stream with objects?

I need help with an application I am working on. The application has to have a custom Camera interface to record a video with audio and have to add some objects in realtime on the TextureView canvas. Old Camera API is deprecated, so I have to use Camera2 API to render the live preview on TextureView. My goal is to draw some objects on top of the TextureView Canvas, could be some text/jpg/gif while the camera stream renders in the background and being able to record the video with my overlay canvas content and camera feed.
Problem is I can draw custom content in an transparent overlay view but that is is just for user's viewing purposes. I have tried researching this for a few days but I am not able to get the right approach to solve my purpose.
I tried the following code after calling the openCamera() method, but then I just see a rectangle drawn but not the camera preview:
Canvas canvas = mTextureView.lockCanvas();
Paint myPaint = new Paint();
myPaint.setColor(Color.WHITE);
myPaint.setStrokeWidth(10);
canvas.drawRect(100, 100, 300, 300, myPaint);
mTextureView.unlockCanvasAndPost(canvas);
I also tried a custom TextureView class and override thevonDrawForeground(Canvas canvas) method but it doesn't work.
The onDraw() method in TextureView class is final and thus, I am not able to do anything at this point except for just streaming the camera feed.
/**
* Subclasses of TextureView cannot do their own rendering
* with the {#link Canvas} object.
*
* #param canvas The Canvas to which the View is rendered.
*/
#Override
protected final void onDraw(Canvas canvas) {
}
In short, I want user to be able to record video through my camera app with some props here and there.

Modifying a video in real time is a high processor and hence, high battery overhead operation - I am sure you know this but its worth saying that if you can add your modifications on the server side, maybe by sending the stream along with a timestamped set of text overlays to the server, you should have more horsepower server side.
The following code will add text and an image to a still picture or frame captured by Camera2 on Android. I have not used it with video so can't comment on speed and whether it is practical to do this with a real time video stream - it wasn't optimised for this but it should be a starting point for you:
//Copy the image to a BitBuffer
ByteBuffer buffer = mCameraImage.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
Log.d(TAG,"ImageSaver bytes.length: " + bytes.length);
buffer.get(bytes);
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inMutable = true;
Bitmap cameraBitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length, opt);
if (cameraBitmap == null) {
Log.d(TAG,"ImageSaver cameraBitmap is null");
return;
} else {
camImgBitmap = cameraBitmap;
}
//Modify captured picture by drawing on canvas
Canvas camImgCanvas = new Canvas(camImgBitmap);
//Draw an image in the middle
Drawable d = ContextCompat.getDrawable(this, R.drawable.image_to_add);
int bitMapWidthCenter = camImgBitmap.getWidth()/2;
int bitMapheightCenter = camImgBitmap.getHeight()/2;
int imageToDrawSize = camImgBitmap.getWidth()/10;
int rTop = bitMapheightCenter - sightsSize;
int rLeft = bitMapWidthCenter - sightsSize;
int rRight = bitMapWidthCenter + sightsSize;
int rBot = bitMapheightCenter + sightsSize;
d.setBounds(rLeft, rTop, rRight, rBot);
d.draw(camImgCanvas);
//Now Draw in some text
Paint paint = new Paint();
paint.setColor(Color.GREEN);
int textSize = camImgBitmap.getHeight()/20;
int textPadding = 40;
paint.setTextSize(textSize);
camImgCanvas.drawText("Name: " + text1, textPadding, (camImgBitmap.getHeight() - (textSize * 2) ) - textPadding, paint);
camImgCanvas.drawText("Time: " + text2 + " degrees", textPadding, (camImgBitmap.getHeight() - textSize) - textPadding, paint);

Likely the most performant option is to pipe the camera feed straight into the GPU, draw on top of it there, and from there render to the display and a video encoder directly.
This is what many video chat apps do, for example, for any effects.
You can use a SurfaceTexture to connect camera2 to EGL, and then you can render the preview onto a quad, and then your additions on top.
Then you can render to a screen buffer (GLSurfaceView for example), and to a separate EGLImage from a MediaRecorder/MediaCodec Surface.
There's a lot of code involved there, and a lot of scaffolding for EGL setup, so it's hard to point to any simple examples.

Android: Get float or int array from image that corresponds to pixel values

I have an application that currently takes black and white 176 x 144 images via camera2 in jpeg format and saves it to storage. In addition to this, I also need an int/float array where each point corresponds to the intensity of one pixel from the jpeg image. As the image is black and white this array of numbers should be sufficient to reconstruct my image by simply plotting it as a heatmap along the appropriate dimensions, as only one value per pixel is needed in black and white space.
The way I have found to do this is to convert the jpeg into a byte array into a bitmap into an int array of sRGB values into an int array of R values. This does work (code below), but seems like a really longwinded and inefficient way of doing this. Is anyone able to suggest a more direct way? Such as getting pixel values directly from the original jpeg Image?
// Convert photo (176 x 144) to byte array (1x25344)
Image mImage = someImage // jpeg capture from camera
ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);
//Save photo as jpeg
savePhoto(bytes);
//Save pixel values by converting to Bitmap first
Bitmap image = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
int x = image.getWidth();
int y = image.getHeight();
int[] intArray = new int[x * y];
image.getPixels(intArray, 0, x, 0, 0, x, y);
for(int i = 0; i < intArray.length; i++) {
intArray[i] = Color.red(intArray[i]); //Any colour will do
}
//Save pixel values
saveIntArray(intArray);

Android Camera2 API Showing Processed Preview Image

New Camera 2 API is very different from old one.Showing the manipulated camera frames to user part of pipeline is confuses me. I know there is very good explanation on Camera preview image data processing with Android L and Camera2 API but showing frames is still not clear. My question is what is the way of showing frames on screen which came from ImageReaders callback function after some processing while preserving efficiency and speed in Camera2 api pipeline?
Example Flow :
camera.add_target(imagereader.getsurface) -> on imagereaders callback do some processing -> (show that processed image on screen?)
Workaround Idea : Sending bitmaps to imageview every time new frame processed.

Edit after clarification of the question; original answer at bottom
Depends on where you're doing your processing.
If you're using RenderScript, you can connect a Surface from a SurfaceView or a TextureView to an Allocation (with setSurface), and then write your processed output to that Allocation and send it out with Allocation.ioSend(). The HDR Viewfinder demo uses this approach.
If you're doing EGL shader-based processing, you can connect a Surface to an EGLSurface with eglCreateWindowSurface, with the Surface as the native_window argument. Then you can render your final output to that EGLSurface and when you call eglSwapBuffers, the buffer will be sent to the screen.
If you're doing native processing, you can use the NDK ANativeWindow methods to write to a Surface you pass from Java and convert to an ANativeWindow.
If you're doing Java-level processing, that's really slow and you probably don't want to. But can use the new Android M ImageWriter class, or upload a texture to EGL every frame.
Or as you say, draw to an ImageView every frame, but that'll be slow.
Original answer:
If you are capturing JPEG images, you can simply copy the contents of the ByteBuffer from Image.getPlanes()[0].getBuffer() into a byte[], and then use BitmapFactory.decodeByteArray to convert it to a Bitmap.
If you are capturing YUV_420_888 images, then you need to write your own conversion code from the 3-plane YCbCr 4:2:0 format to something you can display, such as a int[] of RGB values to create a Bitmap from; unfortunately there's not yet a convenient API for this.
If you are capturing RAW_SENSOR images (Bayer-pattern unprocessed sensor data), then you need to do a whole lot of image processing or just save a DNG.

I had the same need, and wanted a quick and dirty manipulation for a demo. I was not worried about efficient processing for a final product. This was easily achieved using the following java solution.
My original code to connect the camera2 preview to a TextureView was commented-out and replaced with a surface to an ImageReader:
// Get the surface of the TextureView on the layout
//SurfaceTexture texture = mTextureView.getSurfaceTexture();
//if (null == texture) {
// return;
//}
//texture.setDefaultBufferSize(mPreviewWidth, mPreviewHeight);
//Surface surface = new Surface(texture);
// Capture the preview to the memory reader instead of a UI element
mPreviewReader = ImageReader.newInstance(mPreviewWidth, mPreviewHeight, ImageFormat.JPEG, 1);
Surface surface = mPreviewReader.getSurface();
// This part stays the same regardless of where we render
mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mCaptureRequestBuilder.addTarget(surface);
mCameraDevice.createCaptureSession(...
Then I registered a listener for the image:
mPreviewReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
#Override
public void onImageAvailable(ImageReader reader) {
Image image = reader.acquireLatestImage();
if (image != null) {
Image.Plane plane = image.getPlanes()[0];
ByteBuffer buffer = plane.getBuffer();
byte[] bytes = new byte[buffer.capacity()];
buffer.get(bytes);
Bitmap preview = BitmapFactory.decodeByteArray(bytes, 0, buffer.capacity());
image.close();
if(preview != null ) {
// This gets the canvas for the same mTextureView we would have connected to the
// Camera2 preview directly above.
Canvas canvas = mTextureView.lockCanvas();
if (canvas != null) {
float[] colorTransform = {
0, 0, 0, 0, 0,
.35f, .45f, .25f, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 1, 0};
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.set(colorTransform); //Apply the monochrome green
ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix);
Paint paint = new Paint();
paint.setColorFilter(colorFilter);
canvas.drawBitmap(preview, 0, 0, paint);
mTextureView.unlockCanvasAndPost(canvas);
}
}
}
}
}, mBackgroundPreviewHandler);

Take a screenshot using MediaProjection

With the MediaProjection APIs available in Android L it's possible to
capture the contents of the main screen (the default display) into a Surface object, which your app can then send across the network
I have managed to get the VirtualDisplay working, and my SurfaceView is correctly displaying the content of the screen.
What I want to do is to capture a frame displayed in the Surface, and print it to file. I have tried the following, but all I get is a black file:
Bitmap bitmap = Bitmap.createBitmap
(surfaceView.getWidth(), surfaceView.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
surfaceView.draw(canvas);
printBitmapToFile(bitmap);
Any idea on how to retrieve the displayed data from the Surface?
EDIT
So as #j__m suggested I'm now setting up the VirtualDisplay using the Surface of an ImageReader:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
displayWidth = size.x;
displayHeight = size.y;
imageReader = ImageReader.newInstance(displayWidth, displayHeight, ImageFormat.JPEG, 5);
Then I create the virtual display passing the Surface to the MediaProjection:
int flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY | DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC;
DisplayMetrics metrics = getResources().getDisplayMetrics();
int density = metrics.densityDpi;
mediaProjection.createVirtualDisplay("test", displayWidth, displayHeight, density, flags,
imageReader.getSurface(), null, projectionHandler);
Finally, in order to get a "screenshot" I acquire an Image from the ImageReader and read the data from it:
Image image = imageReader.acquireLatestImage();
byte[] data = getDataFromImage(image);
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
The problem is that the resulting bitmap is null.
This is the getDataFromImage method:
public static byte[] getDataFromImage(Image image) {
Image.Plane[] planes = image.getPlanes();
ByteBuffer buffer = planes[0].getBuffer();
byte[] data = new byte[buffer.capacity()];
buffer.get(data);
return data;
}
The Image returned from the acquireLatestImage has always data with default size of 7672320 and the decoding returns null.
More specifically, when the ImageReader tries to acquire an image, the status ACQUIRE_NO_BUFS is returned.

After spending some time and learning about Android graphics architecture a bit more than desirable, I have got it to work. All necessary pieces are well-documented, but can cause headaches, if you aren't already familiar with OpenGL, so here is a nice summary "for dummies".
I am assuming that you
Know about Grafika, an unofficial Android media API test-suite, written by Google's work-loving employees in their spare time;
Can read through Khronos GL ES docs to fill gaps in OpenGL ES knowledge, when necessary;
Have read this document and understood most of written there (at least parts about hardware composers and BufferQueue).
The BufferQueue is what ImageReader is about. That class was poorly named to begin with – it would be better to call it "ImageReceiver" – a dumb wrapper around receiving end of BufferQueue (inaccessible via any other public API). Don't be fooled: it does not perform any conversions. It does not allow querying formats, supported by producer, even if C++ BufferQueue exposes that information internally. It may fail in simple situations, for example if producer uses a custom, obscure format, (such as BGRA).
The above-listed issues are why I recommend to use OpenGL ES glReadPixels as generic fallback, but still attempt to use ImageReader if available, since it potentially allows retrieving the image with minimal copies/transformations.
To get a better idea how to use OpenGL for the task, let's look at Surface, returned by ImageReader/MediaCodec. It is nothing special, just normal Surface on top of SurfaceTexture with two gotchas: OES_EGL_image_external and EGL_ANDROID_recordable.
OES_EGL_image_external
Simply put, OES_EGL_image_external is a a flag, that must be passed to glBindTexture to make the texture work with BufferQueue. Rather than defining specific color format etc., it is an opaque container for whatever is received from producer. Actual contents may be in YUV colorspace (mandatory for Camera API), RGBA/BGRA (often used by video drivers) or other, possibly vendor-specific format. The producer may offer some niceties, such as JPEG or RGB565 representation, but don't hold your hopes high.
The only producer, covered by CTS tests as of Android 6.0, is a Camera API (AFAIK only it's Java facade). The reason, why there are many MediaProjection + RGBA8888 ImageReader examples flying around is because it is a frequently encountered common denomination and the only format, mandated by OpenGL ES spec for glReadPixels. Still don't be surprised if display composer decides to use completely unreadable format or simply the one, unsupported by ImageReader class (such as BGRA8888) and you will have to deal with it.
EGL_ANDROID_recordable
As evident from reading the specification, it is a flag, passed to eglChooseConfig in order to gently push producer towards generating YUV images. Or optimize the pipeline for reading from video memory. Or something. I am not aware of any CTS tests, ensuring it's correct treatment (and even specification itself suggests, that individual producers may be hard-coded to give it special treatment), so don't be surprised if it happens to be unsupported (see Android 5.0 emulator) or silently ignored. There is no definition in Java classes, just define the constant yourself, like Grafika does.
Getting to hard part
So what is one supposed to do to read from VirtualDisplay in background "the right way"?
Create EGL context and EGL display, possibly with "recordable" flag, but not necessarily.
Create an offscreen buffer for storing image data before it is read from video memory.
Create GL_TEXTURE_EXTERNAL_OES texture.
Create a GL shader for drawing the texture from step 3 to buffer from step 2. The video driver will (hopefully) ensure, that anything, contained in "external" texture will be safely converted to conventional RGBA (see the spec).
Create Surface + SurfaceTexture, using "external" texture.
Install OnFrameAvailableListener to the said SurfaceTexture (this must be done before the next step, or else the BufferQueue will be screwed!)
Supply the surface from step 5 to the VirtualDisplay
Your OnFrameAvailableListener callback will contain the following steps:
Make the context current (e.g. by making your offscreen buffer current);
updateTexImage to request an image from producer;
getTransformMatrix to retrieve the transformation matrix of texture, fixing whatever madness may be plaguing the producer's output. Note, that this matrix will fix the OpenGL upside-down coordinate system, but we will reintroduce the upside-downness in the next step.
Draw the "external" texture on our offscreen buffer, using the previously created shader. The shader needs to additionally flip it's Y coordinate unless you want to end up with flipped image.
Use glReadPixels to read from your offscreen video buffer into a ByteBuffer.
Most of above steps are internally performed when reading video memory with ImageReader, but some differ. Alignment of rows in created buffer can be defined by glPixelStore (and defaults to 4, so you don't have to account for it when using 4-byte RGBA8888).
Note, that aside from processing a texture with shaders GL ES does no automatic conversion between formats (unlike the desktop OpenGL). If you want RGBA8888 data, make sure to allocate the offscreen buffer in that format and request it from glReadPixels.
EglCore eglCore;
Surface producerSide;
SurfaceTexture texture;
int textureId;
OffscreenSurface consumerSide;
ByteBuffer buf;
Texture2dProgram shader;
FullFrameRect screen;
...
// dimensions of the Display, or whatever you wanted to read from
int w, h = ...
// feel free to try FLAG_RECORDABLE if you want
eglCore = new EglCore(null, EglCore.FLAG_TRY_GLES3);
consumerSide = new OffscreenSurface(eglCore, w, h);
consumerSide.makeCurrent();
shader = new Texture2dProgram(Texture2dProgram.ProgramType.TEXTURE_EXT)
screen = new FullFrameRect(shader);
texture = new SurfaceTexture(textureId = screen.createTextureObject(), false);
texture.setDefaultBufferSize(reqWidth, reqHeight);
producerSide = new Surface(texture);
texture.setOnFrameAvailableListener(this);
buf = ByteBuffer.allocateDirect(w * h * 4);
buf.order(ByteOrder.nativeOrder());
currentBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Only after doing all of above you can initialize your VirtualDisplay with producerSide Surface.
Code of frame callback:
float[] matrix = new float[16];
boolean closed;
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
// there may still be pending callbacks after shutting down EGL
if (closed) return;
consumerSide.makeCurrent();
texture.updateTexImage();
texture.getTransformMatrix(matrix);
consumerSide.makeCurrent();
// draw the image to framebuffer object
screen.drawFrame(textureId, matrix);
consumerSide.swapBuffers();
buffer.rewind();
GLES20.glReadPixels(0, 0, w, h, GLES10.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buf);
buffer.rewind();
currentBitmap.copyPixelsFromBuffer(buffer);
// congrats, you should have your image in the Bitmap
// you can release the resources or continue to obtain
// frames for whatever poor-man's video recorder you are writing
}
The code above is a greatly simplified version of approach, found in this Github project, but all referenced classes come directly from Grafika.
Depending on your hardware you may have to jump few extra hoops to get things done: using setSwapInterval, calling glFlush before making the screenshot etc. Most of these can be figured out on your own from contents of LogCat.
In order to avoid Y coordinate reversal, replace the vertex shader, used by Grafika, with the following one:
String VERTEX_SHADER_FLIPPED =
"uniform mat4 uMVPMatrix;\n" +
"uniform mat4 uTexMatrix;\n" +
"attribute vec4 aPosition;\n" +
"attribute vec4 aTextureCoord;\n" +
"varying vec2 vTextureCoord;\n" +
"void main() {\n" +
" gl_Position = uMVPMatrix * aPosition;\n" +
" vec2 coordInterm = (uTexMatrix * aTextureCoord).xy;\n" +
// "OpenGL ES: how flip the Y-coordinate: 6542nd edition"
" vTextureCoord = vec2(coordInterm.x, 1.0 - coordInterm.y);\n" +
"}\n";
Parting words
The above-described approach can be used when ImageReader does not work for you, or if you want to perform some shader processing on Surface contents before moving images from GPU.
It's speed may be harmed by doing extra copy to offscreen buffer, but the impact of running shader would be minimal if you know the exact format of received buffer (e.g. from ImageReader) and use the same format for glReadPixels.
For example, if your video driver is using BGRA as internal format, you would check if EXT_texture_format_BGRA8888 is supported (it likely would), allocate offscreen buffer and retrive the image in this format with glReadPixels.
If you want to perform a complete zero-copy or employ formats, not supported by OpenGL (e.g. JPEG), you are still better off using ImageReader.

The various "how do I capture a screen shot of a SurfaceView" answers (e.g. this one) all still apply: you can't do that.
The SurfaceView's surface is a separate layer, composited by the system, independent of the View-based UI layer. Surfaces are not buffers of pixels, but rather queues of buffers, with a producer-consumer arrangement. Your app is on the producer side. Getting a screen shot requires you to be on the consumer side.
If you direct the output to a SurfaceTexture, instead of a SurfaceView, you will have both sides of the buffer queue in your app process. You can render the output with GLES and read it into an array with glReadPixels(). Grafika has some examples of doing stuff like this with the Camera preview.
To capture the screen as video, or send it over a network, you would want to send it to the input surface of a MediaCodec encoder.
More details on the Android graphics architecture are available here.

I have this working code:
mImageReader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 5);
mProjection.createVirtualDisplay("test", width, height, density, flags, mImageReader.getSurface(), new VirtualDisplayCallback(), mHandler);
mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
#Override
public void onImageAvailable(ImageReader reader) {
Image image = null;
FileOutputStream fos = null;
Bitmap bitmap = null;
try {
image = mImageReader.acquireLatestImage();
fos = new FileOutputStream(getFilesDir() + "/myscreen.jpg");
final Image.Plane[] planes = image.getPlanes();
final Buffer buffer = planes[0].getBuffer().rewind();
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
bitmap.compress(CompressFormat.JPEG, 100, fos);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fos!=null) {
try {
fos.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
if (bitmap!=null)
bitmap.recycle();
if (image!=null)
image.close();
}
}
}, mHandler);
I believe that the rewind() on the Bytebuffer did the trick, not really sure why though. I am testing it against an Android emulator 21 as I do not have a Android-5.0 device at hand at the moment.
Hope it helps!

ImageReader is the class you want.
https://developer.android.com/reference/android/media/ImageReader.html

I have this working code:-for tablet and mobile device:-
private void createVirtualDisplay() {
// get width and height
Point size = new Point();
mDisplay.getSize(size);
mWidth = size.x;
mHeight = size.y;
// start capture reader
if (Util.isTablet(getApplicationContext())) {
mImageReader = ImageReader.newInstance(metrics.widthPixels, metrics.heightPixels, PixelFormat.RGBA_8888, 2);
}else{
mImageReader = ImageReader.newInstance(mWidth, mHeight, PixelFormat.RGBA_8888, 2);
}
// mImageReader = ImageReader.newInstance(450, 450, PixelFormat.RGBA_8888, 2);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mVirtualDisplay = sMediaProjection.createVirtualDisplay(SCREENCAP_NAME, mWidth, mHeight, mDensity, VIRTUAL_DISPLAY_FLAGS, mImageReader.getSurface(), null, mHandler);
}
mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
int onImageCount = 0;
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
#Override
public void onImageAvailable(ImageReader reader) {
Image image = null;
FileOutputStream fos = null;
Bitmap bitmap = null;
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
image = reader.acquireLatestImage();
}
if (image != null) {
Image.Plane[] planes = new Image.Plane[0];
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
planes = image.getPlanes();
}
ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * mWidth;
// create bitmap
//
if (Util.isTablet(getApplicationContext())) {
bitmap = Bitmap.createBitmap(metrics.widthPixels, metrics.heightPixels, Bitmap.Config.ARGB_8888);
}else{
bitmap = Bitmap.createBitmap(mWidth + rowPadding / pixelStride, mHeight, Bitmap.Config.ARGB_8888);
}
// bitmap = Bitmap.createBitmap(mImageReader.getWidth() + rowPadding / pixelStride,
// mImageReader.getHeight(), Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
// write bitmap to a file
SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy_HH:mm:ss");
String formattedDate = df.format(Calendar.getInstance().getTime()).trim();
String finalDate = formattedDate.replace(":", "-");
String imgName = Util.SERVER_IP + "_" + SPbean.getCurrentImageName(getApplicationContext()) + "_" + finalDate + ".jpg";
String mPath = Util.SCREENSHOT_PATH + imgName;
File imageFile = new File(mPath);
fos = new FileOutputStream(imageFile);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
Log.e(TAG, "captured image: " + IMAGES_PRODUCED);
IMAGES_PRODUCED++;
SPbean.setScreenshotCount(getApplicationContext(), ((SPbean.getScreenshotCount(getApplicationContext())) + 1));
if (imageFile.exists())
new DbAdapter(LegacyKioskModeActivity.this).insertScreenshotImageDetails(SPbean.getScreenshotTaskid(LegacyKioskModeActivity.this), imgName);
stopProjection();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
if (bitmap != null) {
bitmap.recycle();
}
if (image != null) {
image.close();
}
}
}
}, mHandler);
}
2>onActivityResult call:-
if (Util.isTablet(getApplicationContext())) {
metrics = Util.getScreenMetrics(getApplicationContext());
} else {
metrics = getResources().getDisplayMetrics();
}
mDensity = metrics.densityDpi;
mDisplay = getWindowManager().getDefaultDisplay();
3>
public static DisplayMetrics getScreenMetrics(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
DisplayMetrics dm = new DisplayMetrics();
display.getMetrics(dm);
return dm;
}
public static boolean isTablet(Context context) {
boolean xlarge = ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == 4);
boolean large = ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE);
return (xlarge || large);
}
Hope this will help who is getting distorted images on device while capturing through MediaProjection Api.

How to use high-quality rendering for an Android resource bitmap loaded into an OpenGL texture?

I know very little about OpenGL so please be gentle.
The app needs to load a bitmap (from resources), resize it, and use it in an OpenGL texture. I have an implementation that works, but there was a bad banding issue on the Wildfire S. So I changed the implementation and fixed the banding issue (by switching to ARGB_8888) but that then broke the functionality on the Galaxy Nexus and the Nexus One.
I am seeing three visual presentations:
The bitmap (a smooth 24-bit gradient) shows correctly, with no banding.
The gradient shows, but with obvious banding
The texture shows as flat white, no bitmap (or issues in logcat)
Here are two versions of the method to load the bitmap, and notes on the results seen with each:
// White on Galaxy Nexus. White on Nexus One. Renders correct image (no banding) on Wildfire S
private Bitmap getBitmap1() {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.outWidth = getTextureSize();
options.outHeight = getTextureSize();
final Bitmap bmp;
bmp = BitmapFactory.decodeResource(getResources(), bitmapResourceId, options);
return bmp;
}
// Renders correctly (no banding) on Galaxy Nexus. Renders on Nexus One and Wildfire S but with obvious banding.
private Bitmap getBitmap2() {
int textureSize = getTextureSize();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.outWidth = getTextureSize();
options.outHeight = getTextureSize();
final Bitmap bmp;
bmp = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), bitmapResourceId, options), textureSize, textureSize, true);
return bmp;
}
getTextureSize() returns 1024.
How do I build a single method that shows the bitmap without banding on all devices, and without any devices show a big white box?

getBitmap1
outHeight and outWidth are used in conjunction with inJustDecodeBounds. You cannot use them to load a scaled bitmap. So the reason you are seeing a white texture is that the bitmap is not a power of two.
getBitmap2
you should keep a reference to the bitmap returned by decodeResource so that you can recycle it later.
also use options.inScaled = false;to load an unscaled version of the bitmap. Also take note that createScaledBitmap may change the depth of the bitmap to RGB_565 if the original bitmap contains no alpha channel (Source);
Questions:
is the original Bitmap Resource square? If not your scaling code will change the aspect ratio which could result in artifacts.
EDIT:
so how do you scale a bitmap and preserve the bit depths?
Easiest solution is to pass a bitmap with alpha channel into createScaledBitmap.
You can also scale yourself like so:
Bitmap newBitmap = Bitmap.createBitmap(1024, 1024, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newBitmap);
final int width = src.getWidth();
final int height = src.getHeight();
final float sx = 1024 / (float)width;
final float sy = 1024 / (float)height;
Matrix m = new Matrix();
m.setScale(sx, sy);
canvas.drawBitmap(src,m,null );
src.recycle();
ANOTHER EDIT:
take a look at this Question for pointers on how to deal with that.

OpenGL.org has this to say about that error:
GL_INVALID_VALUE​, 0x0501: Given when a value parameter is not a leval
value for that function. This is only given for local problems; if the
spec allows the value in certain circumstances, and other parameters
or state dictate those circumstances, then GL_INVALID_OPERATION is the
result instead.
Step one is to find the exact opengl call that is causing the problem. You'll have to do trial and error to see which line is throwing that error. If you set up the program flow like this:
glSomeCallA()
glGetError() //returns 0
glSomeCallB()
glGetError() //returns 0
glSomeCallC()
glGetError() //returns 0x501
Then you'll know that glSomeCallC was the operation that caused the error. If you look at the man page for that particular call, it will enumerate everything that could cause a specific error to occur.
In your case I'll guess that the error will be after glTexImage call just to save you some time, though I'm not positive.
If you look at the glTexImage man page, at the bottom it will list everything that can cause an invalid value error. My guess will be that your texture is larger than the GL_MAX_TEXTURE_SIZE. You can confirm this by checking glGetIntegerv(GL_MAX_TEXTURE_SIZE);

Color Banding Solved ooooooooooyyyyyyyeaaaaaaaaaa
I solved color banding in two phases
1) * when we use the BitmapFactory to decode resources it decodes the resource in RGB565 which shows color banding, instead of using ARGB_8888, so i used BitmapFactory.Options for setting the decode options to ARGB_8888
second problem was whenever i scaled the bitmap it again got banded
2) This was the tough part and took a lot of searching and finally worked
* the method Bitmap.createScaledBitmap for scaling bitmaps also reduced the images to RGB565 format after scaling i got banded images(the old method for solving this was using at least one transparent pixel in a png but no other format like jpg or bmp worked)so here i created a method CreateScaledBitmap to scale the bitmap with the original bitmaps configurations in the resulting scale bitmap(actually i copied the method from a post by logicnet.dk and translated in java)
BitmapFactory.Options myOptions = new BitmapFactory.Options();
myOptions.inDither = true;
myOptions.inScaled = false;
myOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;//important
//myOptions.inDither = false;
myOptions.inPurgeable = true;
Bitmap tempImage =
BitmapFactory.decodeResource(getResources(),R.drawable.defaultart, myOptions);//important
//this is important part new scale method created by someone else
tempImage = CreateScaledBitmap(tempImage,300,300,false);
ImageView v = (ImageView)findViewById(R.id.imageView1);
v.setImageBitmap(tempImage);
// the function
public static Bitmap CreateScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter)
{
Matrix m = new Matrix();
m.setScale(dstWidth / (float)src.getWidth(), dstHeight / (float)src.getHeight());
Bitmap result = Bitmap.createBitmap(dstWidth, dstHeight, src.getConfig());
Canvas canvas = new Canvas(result);
//using (var canvas = new Canvas(result))
{
Paint paint = new Paint();
paint.setFilterBitmap(filter);
canvas.drawBitmap(src, m, paint);
}
return result;
}
Please correct me if i am wrong.
Also comment if it worked for you.
I am so happy i solved it, Hope it works for you.