Java 类com.facebook.imagepipeline.animated.base.AnimatedImageFrame 实例源码

private void renderImageSupportsScaling(Canvas canvas, AnimatedImageFrame frame) {
  double xScale = (double) mRenderedBounds.width() / (double) mAnimatedImage.getWidth();
  double yScale = (double) mRenderedBounds.height() / (double) mAnimatedImage.getHeight();

  int frameWidth = (int) Math.round(frame.getWidth() * xScale);
  int frameHeight = (int) Math.round(frame.getHeight() * yScale);
  int xOffset = (int) (frame.getXOffset() * xScale);
  int yOffset = (int) (frame.getYOffset() * yScale);

  synchronized (this) {
    prepareTempBitmapForThisSize(mRenderedBounds.width(), mRenderedBounds.height());
    frame.renderFrame(frameWidth, frameHeight, mTempBitmap);

    // Temporary bitmap can be bigger than frame, so we should draw only rendered area of bitmap
    mRenderSrcRect.set(0, 0, mRenderedBounds.width(), mRenderedBounds.height());
    mRenderDstRect.set(xOffset, yOffset, mRenderedBounds.width(), mRenderedBounds.height());

    canvas.drawBitmap(mTempBitmap, mRenderSrcRect, mRenderDstRect, null);
  }
}

private void renderImageDoesNotSupportScaling(Canvas canvas, AnimatedImageFrame frame) {
  int frameWidth = frame.getWidth();
  int frameHeight = frame.getHeight();
  int xOffset = frame.getXOffset();
  int yOffset = frame.getYOffset();
  synchronized (this) {
    prepareTempBitmapForThisSize(frameWidth, frameHeight);
    frame.renderFrame(frameWidth, frameHeight, mTempBitmap);

    // Temporary bitmap can be bigger than frame, so we should draw only rendered area of bitmap
    mRenderSrcRect.set(0, 0, frameWidth, frameHeight);
    mRenderDstRect.set(0, 0, frameWidth, frameHeight);

    float xScale = (float) mRenderedBounds.width() / (float) mAnimatedImage.getWidth();
    float yScale = (float) mRenderedBounds.height() / (float) mAnimatedImage.getHeight();
    canvas.save();
    canvas.scale(xScale, yScale);
    canvas.translate(xOffset, yOffset);
    canvas.drawBitmap(mTempBitmap, mRenderSrcRect, mRenderDstRect, null);
    canvas.restore();
  }
}

private void renderImageSupportsScaling(Canvas canvas, AnimatedImageFrame frame) {
  double xScale = (double) mRenderedBounds.width() / (double) mAnimatedImage.getWidth();
  double yScale = (double) mRenderedBounds.height() / (double) mAnimatedImage.getHeight();

  int frameWidth = (int) Math.round(frame.getWidth() * xScale);
  int frameHeight = (int) Math.round(frame.getHeight() * yScale);
  int xOffset = (int) (frame.getXOffset() * xScale);
  int yOffset = (int) (frame.getYOffset() * yScale);

  synchronized (this) {
    int renderedWidth = mRenderedBounds.width();
    int renderedHeight = mRenderedBounds.height();
    // Update the temp bitmap to be >= rendered dimensions
    prepareTempBitmapForThisSize(renderedWidth, renderedHeight);
    frame.renderFrame(frameWidth, frameHeight, mTempBitmap);
    // Temporary bitmap can be bigger than frame, so we should draw only rendered area of bitmap
    mRenderSrcRect.set(0, 0, renderedWidth, renderedHeight);
    mRenderDstRect.set(xOffset, yOffset, xOffset + renderedWidth, yOffset + renderedHeight);

    canvas.drawBitmap(mTempBitmap, mRenderSrcRect, mRenderDstRect, null);
  }
}

private void renderImageDoesNotSupportScaling(Canvas canvas, AnimatedImageFrame frame) {
  int frameWidth = frame.getWidth();
  int frameHeight = frame.getHeight();
  int xOffset = frame.getXOffset();
  int yOffset = frame.getYOffset();
  synchronized (this) {
    prepareTempBitmapForThisSize(frameWidth, frameHeight);
    frame.renderFrame(frameWidth, frameHeight, mTempBitmap);

    // Temporary bitmap can be bigger than frame, so we should draw only rendered area of bitmap
    mRenderSrcRect.set(0, 0, frameWidth, frameHeight);
    mRenderDstRect.set(0, 0, frameWidth, frameHeight);

    float xScale = (float) mRenderedBounds.width() / (float) mAnimatedImage.getWidth();
    float yScale = (float) mRenderedBounds.height() / (float) mAnimatedImage.getHeight();
    canvas.save();
    canvas.scale(xScale, yScale);
    canvas.translate(xOffset, yOffset);
    canvas.drawBitmap(mTempBitmap, mRenderSrcRect, mRenderDstRect, null);
    canvas.restore();
  }
}

@Override
public void renderFrame(int frameNumber, Canvas canvas) {
  AnimatedImageFrame frame  = mAnimatedImage.getFrame(frameNumber);
  try {
    if (mAnimatedImage.doesRenderSupportScaling()) {
      renderImageSupportsScaling(canvas, frame);
    } else {
      renderImageDoesNotSupportScaling(canvas, frame);
    }
  } finally {
    frame.dispose();
  }
}

@Override
public void renderFrame(int frameNumber, Canvas canvas) {
  AnimatedImageFrame frame  = mAnimatedImage.getFrame(frameNumber);
  try {
    if (mAnimatedImage.doesRenderSupportScaling()) {
      renderImageSupportsScaling(canvas, frame);
    } else {
      renderImageDoesNotSupportScaling(canvas, frame);
    }
  } finally {
    frame.dispose();
  }
}