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@ -14,6 +14,7 @@ import android.os.Build; |
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import com.otaliastudios.cameraview.CameraLogger; |
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import com.otaliastudios.cameraview.PictureResult; |
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import com.otaliastudios.cameraview.internal.egl.EglBaseSurface; |
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import com.otaliastudios.cameraview.overlay.Overlay; |
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import com.otaliastudios.cameraview.controls.Facing; |
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import com.otaliastudios.cameraview.engine.CameraEngine; |
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@ -35,6 +36,23 @@ import androidx.annotation.Nullable; |
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import android.view.Surface; |
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/** |
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* API 19. |
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* Records a picture snapshots from the {@link GlCameraPreview}. It works as follows: |
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* |
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* - We register a one time {@link RendererFrameCallback} on the preview |
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* - We get the textureId and the frame callback on the {@link RendererThread} |
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* - [Optional: we construct another textureId for overlays] |
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* - We take a handle of the EGL context from the {@link RendererThread} |
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* - We move to another thread, and create a new EGL surface for that EGL context. |
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* - We make this new surface current, and re-draw the textureId on it |
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* - [Optional: fill the overlayTextureId and draw it on the same surface] |
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* - We use glReadPixels (through {@link EglBaseSurface#saveFrameTo(Bitmap.CompressFormat)}) and save to file. |
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* |
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* We create a new EGL surface and redraw the frame because: |
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* 1. We want to go off the renderer thread as soon as possible |
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* 2. We have overlays to be drawn - we don't want to draw them on the preview surface, not even for a frame. |
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*/ |
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public class SnapshotGlPictureRecorder extends PictureRecorder { |
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private static final String TAG = SnapshotGlPictureRecorder.class.getSimpleName(); |
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@ -47,6 +65,17 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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private Overlay mOverlay; |
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private boolean mHasOverlay; |
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private int mTextureId; |
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private SurfaceTexture mSurfaceTexture; |
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private float[] mTransform; |
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private int mOverlayTextureId = 0; |
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private SurfaceTexture mOverlaySurfaceTexture; |
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private Surface mOverlaySurface; |
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private float[] mOverlayTransform; |
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private EglViewport mViewport; |
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public SnapshotGlPictureRecorder( |
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@NonNull PictureResult.Stub stub, |
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@NonNull CameraEngine engine, |
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@ -66,19 +95,23 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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public void take() { |
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mPreview.addRendererFrameCallback(new RendererFrameCallback() { |
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int mTextureId; |
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SurfaceTexture mSurfaceTexture; |
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float[] mTransform; |
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int mOverlayTextureId = 0; |
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SurfaceTexture mOverlaySurfaceTexture; |
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Surface mOverlaySurface; |
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float[] mOverlayTransform; |
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@RendererThread |
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public void onRendererTextureCreated(int textureId) { |
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SnapshotGlPictureRecorder.this.onRendererTextureCreated(textureId); |
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} |
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EglViewport mViewport; |
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@RendererThread |
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@Override |
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public void onRendererFrame(@NonNull SurfaceTexture surfaceTexture, final float scaleX, final float scaleY) { |
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mPreview.removeRendererFrameCallback(this); |
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SnapshotGlPictureRecorder.this.onRendererFrame(scaleX, scaleY); |
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} |
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}); |
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} |
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@RendererThread |
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public void onRendererTextureCreated(int textureId) { |
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@TargetApi(Build.VERSION_CODES.KITKAT) |
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private void onRendererTextureCreated(int textureId) { |
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mTextureId = textureId; |
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mViewport = new EglViewport(); |
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mSurfaceTexture = new SurfaceTexture(mTextureId, true); |
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@ -97,43 +130,49 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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} |
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} |
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/** |
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* The tricky part here is the EGL surface creation. |
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* |
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* We don't have a real output window for the EGL surface - we will use glReadPixels() |
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* and never call swapBuffers(), so what we draw is never published. |
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* |
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* 1. One option is to use a pbuffer EGL surface. This works, we just have to pass |
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* the correct width and height. However, it is significantly slower than the current |
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* solution. |
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* |
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* 2. Another option is to create the EGL surface out of a ImageReader.getSurface() |
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* and use the reader to create a JPEG. In this case, we would have to publish |
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* the frame with swapBuffers(). However, currently ImageReader does not support |
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* all formats, it's risky. This is an example error that we get: |
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* "RGBA override BLOB format buffer should have height == width" |
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* |
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* The third option, which we are using, is to create the EGL surface using whatever |
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* {@link Surface} or {@link SurfaceTexture} we have at hand. Since we never call |
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* swapBuffers(), the frame will not actually be rendered. This is the fastest. |
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* |
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* @param scaleX frame scale x in {@link Reference#VIEW} |
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* @param scaleY frame scale y in {@link Reference#VIEW} |
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*/ |
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@RendererThread |
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@Override |
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public void onRendererFrame(@NonNull SurfaceTexture surfaceTexture, final float scaleX, final float scaleY) { |
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mPreview.removeRendererFrameCallback(this); |
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// This kinda work but has drawbacks:
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// - output is upside down due to coordinates in GL: need to flip the byte[] someway
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// - output is not rotated as we would like to: need to create a bitmap copy...
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// - works only in the renderer thread, where it allocates the buffer and reads pixels. Bad!
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/* |
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ByteBuffer buffer = ByteBuffer.allocateDirect(width * height * 4); |
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buffer.order(ByteOrder.LITTLE_ENDIAN); |
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GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buffer); |
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buffer.rewind(); |
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ByteArrayOutputStream bos = new ByteArrayOutputStream(buffer.array().length); |
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Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
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bitmap.copyPixelsFromBuffer(buffer); |
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bitmap.compress(Bitmap.CompressFormat.JPEG, 90, bos); |
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bitmap.recycle(); */ |
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// For this reason it is better to create a new surface,
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// and draw the last frame again there.
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@TargetApi(Build.VERSION_CODES.KITKAT) |
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private void onRendererFrame(final float scaleX, final float scaleY) { |
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// Get egl context from the RendererThread, which is the one in which we have created
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// the textureId and the overlayTextureId, managed by the GlSurfaceView.
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// Next operations can then be performed on different threads using this handle.
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final EGLContext eglContext = EGL14.eglGetCurrentContext(); |
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final EglCore core = new EglCore(eglContext, EglCore.FLAG_RECORDABLE); |
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// final EGLSurface oldSurface = EGL14.eglGetCurrentSurface(EGL14.EGL_DRAW);
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// final EGLDisplay oldDisplay = EGL14.eglGetCurrentDisplay();
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WorkerHandler.execute(new Runnable() { |
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@Override |
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public void run() { |
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// 0. Create an EGL surface
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EglBaseSurface eglSurface = new EglWindowSurface(core, mSurfaceTexture); |
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eglSurface.makeCurrent(); |
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// 1. Get latest texture
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EglWindowSurface surface = new EglWindowSurface(core, mSurfaceTexture); |
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surface.makeCurrent(); |
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mSurfaceTexture.updateTexImage(); |
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mSurfaceTexture.getTransformMatrix(mTransform); |
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// 2. Apply scale and crop:
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// scaleX and scaleY are in REF_VIEW, while our input appears to be in REF_SENSOR.
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// 2. Apply scale and crop
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boolean flip = mEngine.getAngles().flip(Reference.VIEW, Reference.SENSOR); |
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float realScaleX = flip ? scaleY : scaleX; |
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float realScaleY = flip ? scaleX : scaleY; |
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@ -142,26 +181,24 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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Matrix.translateM(mTransform, 0, scaleTranslX, scaleTranslY, 0); |
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Matrix.scaleM(mTransform, 0, realScaleX, realScaleY, 1); |
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// 3. Go back to 0,0 so that rotate and flip work well.
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// 3. Go back to 0,0 so that rotate and flip work well
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Matrix.translateM(mTransform, 0, 0.5F, 0.5F, 0); |
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// 4. Apply rotation:
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// Not sure why we need the minus here.
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// 4. Apply rotation (not sure why we need the minus here)
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Matrix.rotateM(mTransform, 0, -mResult.rotation, 0, 0, 1); |
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mResult.rotation = 0; |
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// 5. Flip horizontally for front camera:
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// 5. Flip horizontally for front camera
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if (mResult.facing == Facing.FRONT) { |
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Matrix.scaleM(mTransform, 0, -1, 1, 1); |
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} |
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// 6. Go back to old position.
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// 6. Go back to old position
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Matrix.translateM(mTransform, 0, -0.5F, -0.5F, 0); |
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// 7. Do pretty much the same for overlays, though with
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// some differences.
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// 7. Do pretty much the same for overlays
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if (mHasOverlay) { |
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// 1. First we must draw on the texture and get latest image.
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// 1. First we must draw on the texture and get latest image
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try { |
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final Canvas surfaceCanvas = mOverlaySurface.lockCanvas(null); |
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surfaceCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); |
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@ -173,7 +210,7 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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mOverlaySurfaceTexture.updateTexImage(); |
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mOverlaySurfaceTexture.getTransformMatrix(mOverlayTransform); |
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// 2. Then we can apply the transformations.
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// 2. Then we can apply the transformations
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int rotation = mEngine.getAngles().offset(Reference.VIEW, Reference.OUTPUT, Axis.ABSOLUTE); |
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Matrix.translateM(mOverlayTransform, 0, 0.5F, 0.5F, 0); |
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Matrix.rotateM(mOverlayTransform, 0, rotation, 0, 0, 1); |
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@ -185,16 +222,16 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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// 8. Draw and save
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mViewport.drawFrame(mTextureId, mTransform); |
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if (mHasOverlay) mViewport.drawFrame(mOverlayTextureId, mOverlayTransform); |
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// don't - surface.swapBuffers();
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mResult.data = surface.saveFrameTo(Bitmap.CompressFormat.JPEG); |
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mResult.format = PictureResult.FORMAT_JPEG; |
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mResult.data = eglSurface.saveFrameTo(Bitmap.CompressFormat.JPEG); |
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// 9. Cleanup
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mSurfaceTexture.releaseTexImage(); |
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surface.release(); |
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eglSurface.releaseEglSurface(); |
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mViewport.release(); |
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mSurfaceTexture.release(); |
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if (mHasOverlay) { |
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mOverlaySurfaceTexture.releaseTexImage(); |
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mOverlaySurface.release(); |
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mOverlaySurfaceTexture.release(); |
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} |
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@ -203,8 +240,6 @@ public class SnapshotGlPictureRecorder extends PictureRecorder { |
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} |
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}); |
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} |
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}); |
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} |
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@Override |
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protected void dispatchResult() { |
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Mattia Iavarone
5 years ago
committed by
GitHub