android.graphics.Matrix#setRectToRect ( )源码实例Demo

public void crop() {
    if (mCropBitmap != null) {

        float cropWidth = mCropWindow.width() / mScaleRate;
        float cropHeight = mCropWindow.height() / mScaleRate;

        Rect cropRect = mCropWindow.getWindowRect(mScaleRate);
        RectF dstRect = new RectF(0, 0, cropWidth, cropHeight);

        Matrix cropMatrix = new Matrix();
        cropMatrix.setRectToRect(new RectF(cropRect), dstRect, Matrix.ScaleToFit.FILL);
        cropMatrix.preConcat(mCropBitmap.getRotateMatrix());

        Bitmap cropped = Bitmap.createBitmap((int) cropWidth, (int) cropHeight, Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(cropped);
        canvas.drawBitmap(mCropBitmap.getBitmap(), cropMatrix, null);

        replace(cropped, 0);
    }
}
 

@NonNull
private static Matrix createShaderMatrix(@NonNull ImageView.ScaleType scaleType, int vWidth,
                                         int vHeight, int bmWidth, int bmHeight) {
  float scale, translateX = 0, translateY = 0;

  if (bmWidth * vHeight > bmHeight * vWidth) {
    scale = vHeight / (float) bmHeight;
    translateX = (vWidth - bmWidth * scale) * 0.5f;
  } else {
    scale = vWidth / (float) bmWidth;
    translateY = (vHeight - bmHeight * scale) * 0.5f;
  }

  Matrix mMatrix = new Matrix();
  if (scaleType == ImageView.ScaleType.FIT_XY) {
    mMatrix.setScale(vWidth / (float) bmWidth, vHeight / (float) bmHeight);
  } else if (scaleType == ImageView.ScaleType.FIT_CENTER) {
    RectF src = new RectF(0, 0, bmWidth, bmHeight);
    RectF dist = new RectF(0, 0, vWidth, vHeight);
    mMatrix.setRectToRect(src, dist, Matrix.ScaleToFit.CENTER);
  } else if (scaleType == ImageView.ScaleType.CENTER_CROP) {
    mMatrix.setScale(scale, scale);
    mMatrix.postTranslate(translateX + 0.5f, translateY + 0.5f);
  }
  return mMatrix;
}
 

/**
 * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
 * This method should be called after the camera preview size is determined in
 * setUpCameraOutputs and also the size of `mTextureView` is fixed.
 *
 * @param viewWidth  The width of `mTextureView`
 * @param viewHeight The height of `mTextureView`
 */
private void configureTransform(int viewWidth, int viewHeight) {
    if (null == mTextureView || null == mPreviewSize) {
        return;
    }
    int rotation = mDisplayOrientation;
    Matrix matrix = new Matrix();
    RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
    RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
    float centerX = viewRect.centerX();
    float centerY = viewRect.centerY();
    if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
        bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
        matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
        float scale = Math.max(
                (float) viewHeight / mPreviewSize.getHeight(),
                (float) viewWidth / mPreviewSize.getWidth());
        matrix.postScale(scale, scale, centerX, centerY);
        matrix.postRotate(90 * (rotation - 2), centerX, centerY);
    } else if (Surface.ROTATION_180 == rotation) {
        matrix.postRotate(180, centerX, centerY);
    }
    mTextureView.setTransform(matrix);
}
 

/**
 * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
 * This method should not to be called until the camera preview size is determined in
 * openCamera, or until the size of `mTextureView` is fixed.
 *
 * @param viewWidth  The width of `mTextureView`
 * @param viewHeight The height of `mTextureView`
 */
private void configureTransform(int viewWidth, int viewHeight) {
    Activity activity = getActivity();
    if (null == mTextureView || null == mPreviewSize || null == activity) {
        return;
    }
    int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
    Matrix matrix = new Matrix();
    RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
    RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
    float centerX = viewRect.centerX();
    float centerY = viewRect.centerY();
    if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
        bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
        matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
        float scale = Math.max(
                (float) viewHeight / mPreviewSize.getHeight(),
                (float) viewWidth / mPreviewSize.getWidth());
        matrix.postScale(scale, scale, centerX, centerY);
        matrix.postRotate(90 * (rotation - 2), centerX, centerY);
    }
    mTextureView.setTransform(matrix);
}
 

/**
 * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
 * This method should be called after the camera preview size is determined in
 * setUpCameraOutputs and also the size of `mTextureView` is fixed.
 *
 * @param viewWidth  The width of `mTextureView`
 * @param viewHeight The height of `mTextureView`
 */
private void configureTransform(final int viewWidth, final int viewHeight) {
    final Activity activity = getActivity();
    if (null == textureView || null == previewSize || null == activity) {
        return;
    }
    final int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
    final Matrix matrix = new Matrix();
    final RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
    final RectF bufferRect = new RectF(0, 0, previewSize.getHeight(), previewSize.getWidth());
    final float centerX = viewRect.centerX();
    final float centerY = viewRect.centerY();
    if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
        bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
        matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
        final float scale =
                Math.max(
                        (float) viewHeight / previewSize.getHeight(),
                        (float) viewWidth / previewSize.getWidth());
        matrix.postScale(scale, scale, centerX, centerY);
        matrix.postRotate(90 * (rotation - 2), centerX, centerY);
    } else if (Surface.ROTATION_180 == rotation) {
        matrix.postRotate(180, centerX, centerY);
    }
    textureView.setTransform(matrix);
}
 

/**
 * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
 * This method should be called after the camera preview size is determined in
 * setUpCameraOutputs and also the size of `mTextureView` is fixed.
 *
 * @param viewWidth  The width of `mTextureView`
 * @param viewHeight The height of `mTextureView`
 */
private void configureTransform(final int viewWidth, final int viewHeight) {
  final Activity activity = getActivity();
  if (null == textureView || null == previewSize || null == activity) {
    return;
  }
  final int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
  final Matrix matrix = new Matrix();
  final RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
  final RectF bufferRect = new RectF(0, 0, previewSize.getHeight(), previewSize.getWidth());
  final float centerX = viewRect.centerX();
  final float centerY = viewRect.centerY();
  if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
    bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
    matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
    final float scale =
        Math.max(
            (float) viewHeight / previewSize.getHeight(),
            (float) viewWidth / previewSize.getWidth());
    matrix.postScale(scale, scale, centerX, centerY);
    matrix.postRotate(90 * (rotation - 2), centerX, centerY);
  } else if (Surface.ROTATION_180 == rotation) {
    matrix.postRotate(180, centerX, centerY);
  }
  textureView.setTransform(matrix);
}
 

private Matrix cameraToPreviewTransform(boolean mirrorX, int displayOrientation,
                                        RectF previewRect)
{
    Matrix transform = new Matrix();

    // Need mirror for front camera.
    transform.setScale(mirrorX ? -1 : 1, 1);

    // Apply a rotate transform.
    // This is the value for android.hardware.Camera.setDisplayOrientation.
    transform.postRotate(displayOrientation);

    // Map camera driver coordinates to preview rect coordinates
    Matrix fill = new Matrix();
    fill.setRectToRect(CAMERA_DRIVER_RECT,
            previewRect,
            Matrix.ScaleToFit.FILL);

    // Concat the previous transform on top of the fill behavior.
    transform.setConcat(fill, transform);

    return transform;
}
 

private Bitmap inMemoryCrop(RotateBitmap rotateBitmap, Bitmap croppedImage, Rect r,
                            int width, int height, int outWidth, int outHeight) {
    // In-memory crop means potential OOM errors,
    // but we have no choice as we can't selectively decode a bitmap with this API level
    System.gc();

    try {
        croppedImage = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.RGB_565);

        Canvas canvas = new Canvas(croppedImage);
        RectF dstRect = new RectF(0, 0, width, height);

        Matrix m = new Matrix();
        m.setRectToRect(new RectF(r), dstRect, Matrix.ScaleToFit.FILL);
        m.preConcat(rotateBitmap.getRotateMatrix());
        canvas.drawBitmap(rotateBitmap.getBitmap(), m, null);
    } catch (OutOfMemoryError e) {
        Log.e("OOM cropping image: " + e.getMessage(), e);
        setResultException(e);
        System.gc();
    }

    // Release bitmap memory as soon as possible
    clearImageView();
    return croppedImage;
}
 

public void setSignatureBitmap(Bitmap signature) {
    clear();
    ensureSignatureBitmap();

    RectF tempSrc = new RectF();
    RectF tempDst = new RectF();

    int dwidth = signature.getWidth();
    int dheight = signature.getHeight();
    int vwidth = getWidth();
    int vheight = getHeight();

    // Generate the required transform.
    tempSrc.set(0, 0, dwidth, dheight);
    tempDst.set(0, 0, vwidth, vheight);

    Matrix drawMatrix = new Matrix();
    drawMatrix.setRectToRect(tempSrc, tempDst, Matrix.ScaleToFit.CENTER);

    Canvas canvas = new Canvas(mSignatureBitmap);
    canvas.drawBitmap(signature, drawMatrix, null);
    setIsEmpty(false);
    invalidate();
}
 

/**
 * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
 * This method should be called after the camera preview size is determined in
 * setUpCameraOutputs and also the size of `mTextureView` is fixed.
 *
 * @param viewWidth  The width of `mTextureView`
 * @param viewHeight The height of `mTextureView`
 */
private void configureTransform(int viewWidth, int viewHeight) {
    Activity activity = getActivity();
    if (null == mTextureView || null == mPreviewSize || null == activity) {
        return;
    }
    int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
    Matrix matrix = new Matrix();
    RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
    RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
    float centerX = viewRect.centerX();
    float centerY = viewRect.centerY();
    if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
        bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
        matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
        float scale = Math.max(
                (float) viewHeight / mPreviewSize.getHeight(),
                (float) viewWidth / mPreviewSize.getWidth());
        matrix.postScale(scale, scale, centerX, centerY);
        matrix.postRotate(90 * (rotation - 2), centerX, centerY);
    } else if (Surface.ROTATION_180 == rotation) {
        matrix.postRotate(180, centerX, centerY);
    }
    mTextureView.setTransform(matrix);
}
 

/**
 * Adds a shadow to a Bitmap.
 * <p>
 * TODO: Make this return Drawable for our use case.
 *
 * @param drawable  Drawable that should be used as the foreground layer
 *                  of the shadow.
 * @param dstHeight Height of the returned bitmap.
 * @param dstWidth  Width of the returned bitmap.
 * @param color     Colour of the drawn shadow.
 * @param size      Size of the drawn shadow.
 * @param dx        Shadow x direction.
 * @param dy        Shadow y direction.
 *
 * @return Bitmap with resulting shadow.
 *
 * @author schwiz (https://stackoverflow.com/a/24579764)
 */
private static Bitmap addShadow(final Drawable drawable, final int dstHeight, final int dstWidth, int color, int size, float dx, float dy) {
    final Bitmap bm = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
            drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bm);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    final Bitmap mask = Bitmap.createBitmap(dstWidth, dstHeight, Bitmap.Config.ALPHA_8);

    final Matrix scaleToFit = new Matrix();
    final RectF src = new RectF(0, 0, bm.getWidth(), bm.getHeight());
    final RectF dst = new RectF(0, 0, dstWidth - dx, dstHeight - dy);
    scaleToFit.setRectToRect(src, dst, Matrix.ScaleToFit.FILL);

    final Matrix dropShadow = new Matrix(scaleToFit);
    dropShadow.postTranslate(dx, dy);

    final Canvas maskCanvas = new Canvas(mask);
    final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    maskCanvas.drawBitmap(bm, scaleToFit, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
    maskCanvas.drawBitmap(bm, dropShadow, paint);

    final BlurMaskFilter filter = new BlurMaskFilter(size, BlurMaskFilter.Blur.SOLID);
    paint.reset();
    paint.setAntiAlias(true);
    paint.setColor(color);
    paint.setMaskFilter(filter);
    paint.setFilterBitmap(true);

    final Bitmap ret = Bitmap.createBitmap(dstWidth, dstHeight, Bitmap.Config.ARGB_8888);
    final Canvas retCanvas = new Canvas(ret);
    retCanvas.drawBitmap(mask, 0, 0, paint);
    retCanvas.drawBitmap(bm, scaleToFit, null);
    mask.recycle();
    return ret;
}
 

@Override
protected void onBoundsChange(Rect bounds) {
	super.onBoundsChange(bounds);
	mRect.set(0, 0, bounds.width(), bounds.height());
	radius = Math.min(bounds.width(), bounds.height()) / 2;
	strokeRadius = radius - strokeWidth / 2;

	// Resize the original bitmap to fit the new bound
	Matrix shaderMatrix = new Matrix();
	shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
	bitmapShader.setLocalMatrix(shaderMatrix);
}
 

@Override
protected void onResize(float width, float height) {
    Matrix matrix = new Matrix();
    Region shapeRegion = new Region(0, 0, (int) width, (int) height);
    matrix.setRectToRect(viewportRect, new RectF(0, 0, width, height), Matrix.ScaleToFit.CENTER);
    for (Layer layer : layers) {
        layer.transform(matrix, shapeRegion);
    }
}
 

private void updateScreenBitmap() {
  if (!mIsRunning) {
    return;
  }
  Activity activity = mActivityTracker.tryGetTopActivity();
  if (activity == null) {
    return;
  }
  // This stuff needs to happen in the UI thread
  View rootView = activity.getWindow().getDecorView();
  try {
    if (mBitmap == null) {
      int viewWidth = rootView.getWidth();
      int viewHeight = rootView.getHeight();
      float scale = Math.min((float) mRequest.maxWidth / (float) viewWidth,
          (float) mRequest.maxHeight / (float) viewHeight);
      int destWidth = (int) (viewWidth * scale);
      int destHeight = (int) (viewHeight * scale);
      mBitmap = Bitmap.createBitmap(destWidth, destHeight, Bitmap.Config.RGB_565);
      mCanvas = new Canvas(mBitmap);
      Matrix matrix = new Matrix();
      mTempSrc.set(0, 0, viewWidth, viewHeight);
      mTempDst.set(0, 0, destWidth, destHeight);
      matrix.setRectToRect(mTempSrc, mTempDst, Matrix.ScaleToFit.CENTER);
      mCanvas.setMatrix(matrix);
    }
    rootView.draw(mCanvas);
  } catch (OutOfMemoryError e) {
    LogUtil.w("Out of memory trying to allocate screencast Bitmap.");
  }
}
 

@Override
protected void onBoundsChange(Rect bounds) {
	super.onBoundsChange(bounds);
	mRect.set(0, 0, bounds.width(), bounds.height());
	radius = Math.min(bounds.width(), bounds.height()) / 2;
	strokeRadius = radius - strokeWidth / 2;

	// Resize the original bitmap to fit the new bound
	Matrix shaderMatrix = new Matrix();
	shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
	bitmapShader.setLocalMatrix(shaderMatrix);
}
 

private void updateTextureViewSize(final GifInfoHandle gifInfoHandle) {
    final Matrix transform = new Matrix();
    final float viewWidth = getWidth();
    final float viewHeight = getHeight();
    final float scaleRef;
    final float scaleX = gifInfoHandle.width / viewWidth;
    final float scaleY = gifInfoHandle.height / viewHeight;
    RectF src = new RectF(0, 0, gifInfoHandle.width, gifInfoHandle.height);
    RectF dst = new RectF(0, 0, viewWidth, viewHeight);
    switch (mScaleType) {
        case CENTER:
            transform.setScale(scaleX, scaleY, viewWidth / 2, viewHeight / 2);
            break;
        case CENTER_CROP:
            scaleRef = 1 / Math.min(scaleX, scaleY);
            transform.setScale(scaleRef * scaleX, scaleRef * scaleY, viewWidth / 2, viewHeight / 2);
            break;
        case CENTER_INSIDE:
            if (gifInfoHandle.width <= viewWidth && gifInfoHandle.height <= viewHeight) {
                scaleRef = 1.0f;
            } else {
                scaleRef = Math.min(1 / scaleX, 1 / scaleY);
            }
            transform.setScale(scaleRef * scaleX, scaleRef * scaleY, viewWidth / 2, viewHeight / 2);
            break;
        case FIT_CENTER:
            transform.setRectToRect(src, dst, Matrix.ScaleToFit.CENTER);
            transform.preScale(scaleX, scaleY);
            break;
        case FIT_END:
            transform.setRectToRect(src, dst, Matrix.ScaleToFit.END);
            transform.preScale(scaleX, scaleY);
            break;
        case FIT_START:
            transform.setRectToRect(src, dst, Matrix.ScaleToFit.START);
            transform.preScale(scaleX, scaleY);
            break;
        case FIT_XY:
            return;
        case MATRIX:
            transform.set(mTransform);
            transform.preScale(scaleX, scaleY);
            break;
    }
    super.setTransform(transform);
}
 

protected Bitmap scaledBitmap(Bitmap bitmap, int width, int height) {
    Matrix m = new Matrix();
    m.setRectToRect(new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight()), new RectF(0, 0, width, height), Matrix.ScaleToFit.CENTER);
    return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m, true);
}
 

public static boolean setBitmapToDisplayMatrix(Matrix m, RectF imageBounds,
                                               RectF displayBounds) {
    m.reset();
    return m.setRectToRect(imageBounds, displayBounds, Matrix.ScaleToFit.CENTER);
}
 

/**
 * Build a matrix which can be used when calling setTransform() on a
 * TextureView.
 * TODO: write unit test when roboletric is available.
 *
 * @param previewViewSize   The TextureView current layout size.
 * @param previewStreamSize The selected preview video stream size.
 * @return The matrix to transform TextureView.
 */
public Matrix toTransformMatrix(Size previewViewSize, Size previewStreamSize)
{
    RectF previewViewRect =
            new RectF(0.0f, 0.0f, previewViewSize.width(), previewViewSize.height());
    PointF previewViewCenter = new PointF(previewViewRect.centerX(), previewViewRect.centerY());

    // If natural orientation is portrait, rotate the buffer dimensions.
    Size previewBufferSize = previewStreamSize;

    if (mOrientationManager.getDeviceNaturalOrientation() == OrientationManager.DeviceNaturalOrientation.PORTRAIT)
    {
        previewBufferSize = new Size(previewStreamSize.height(), previewStreamSize.width());
    }

    Matrix transformMatrix = new Matrix();

    // Adjust the effective preview rect to the center of the texture view.
    final RectF PreviewBufferRect =
            new RectF(0.0f, 0.0f, previewBufferSize.width(), previewBufferSize.height());
    final PointF previewBufferCenter =
            new PointF(PreviewBufferRect.centerX(), PreviewBufferRect.centerY());

    final RectF centeredEffectivePreviewRect = new RectF(PreviewBufferRect);
    centeredEffectivePreviewRect.offset(
            previewViewCenter.x - previewBufferCenter.x,
            previewViewCenter.y - previewBufferCenter.y);

    // Undo ScaleToFit.FILL done by the surface
    transformMatrix.setRectToRect(
            previewViewRect, centeredEffectivePreviewRect, Matrix.ScaleToFit.FILL);

    // Rotate buffer contents to proper orientation
    int rotateDegree = mOrientationManager.getDisplayRotation().getDegrees();
    transformMatrix.postRotate(
            rotateDegree,
            previewViewCenter.x, previewViewCenter.y);

    /**
     * Scale to fit view, cropping the longest dimension.
     *
     * surfaceTextureSize is changed with the device orientation. Since
     * previewStreamSize is always in landscape. To calculate the scale
     * factor, previewStreamSize needs to be rotated if in portrait.
     */
    Size rotatedPreviewSize = previewStreamSize;
    if (mOrientationManager.isInPortrait())
    {
        rotatedPreviewSize = new Size(previewStreamSize.height(), previewStreamSize.width());
    }
    float scale = Math.min(
            (float) previewViewSize.width() / (float) rotatedPreviewSize.width(),
            (float) previewViewSize.height() / (float) rotatedPreviewSize.height());
    transformMatrix.postScale(scale, scale, previewViewCenter.x, previewViewCenter.y);

    RectF scaledPreviewStreamRect = new RectF(
            0.0f, 0.0f, previewStreamSize.width() * scale, previewStreamSize.height() * scale);
    PointF scaledPreviewStreamCenter =
            new PointF(scaledPreviewStreamRect.centerX(), scaledPreviewStreamRect.centerY());
    transformMatrix.postTranslate(
            scaledPreviewStreamCenter.x - previewViewCenter.x,
            scaledPreviewStreamCenter.y - previewViewCenter.y);

    return transformMatrix;
}
 

/**
 * Draws the icon onto the canvas given the source rectangle of the bitmap and the destination
 * rectangle of the canvas.
 */
protected void drawIconOnCanvas(Bitmap icon, Canvas canvas, Paint paint, RectF src, RectF dst) {
    Matrix matrix = new Matrix();
    matrix.setRectToRect(src, dst, Matrix.ScaleToFit.FILL);
    canvas.drawBitmap(icon, matrix, paint);
}