Method checkImage

android/jni/docview.cpp:1390–1426

checks whether point belongs to image: if found, returns true, and _currentImage is set to image

// checks whether point belongs to image: if found, returns true, and _currentImage is set to image
bool DocViewNative::checkImage(int x, int y, int bufWidth, int bufHeight, int &dx, int &dy, bool & needRotate)
{
	_currentImage = _docview->getImageByPoint(lvPoint(x, y));
	if (_currentImage.isNull())
		return false;
	dx = _currentImage->GetWidth();
	dy = _currentImage->GetHeight();
	if (dx < 8 && dy < 8) {
		_currentImage.Clear();
		return JNI_FALSE;
	}
	needRotate = false;
	if (bufWidth <= bufHeight) {
		// screen == portrait
		needRotate = 8 * dx > 10 * dy;
	} else {
		// screen == landscape
		needRotate = 10 * dx < 8 * dy;
	}
	int scale = 1;
	if (dx * dy > MAX_IMAGE_BUF_SIZE) {
		scale = dx * dy /  MAX_IMAGE_BUF_SIZE;
		dx /= scale;
		dy /= scale;
	}
	LVColorDrawBuf * buf = new LVColorDrawBuf(dx, dy);
	buf->Clear(0xFF000000); // transparent
	buf->Draw(_currentImage, 0, 0, dx, dy, false);
	if (needRotate) {
		int c = dx;
		dx = dy;
		dy = c;
		buf->Rotate(CR_ROTATE_ANGLE_90);
	}
	_currentImage = LVCreateDrawBufImageSource(buf, true);
	return true;
}

// draws current image to buffer (scaled, panned)
bool DocViewNative::drawImage(LVDrawBuf * buf, int x, int y, int dx, int dy)