Merge "Fix Wi-Fi QR scanner crash problem" into qt-dev (7d7353c3) · Commits · e / os / android_packages_apps_Settings

src/com/android/settings/wifi/qrcode/QrCamera.java

+54 −4

Original line number	Diff line number	Diff line
		@@ -62,7 +62,14 @@ public class QrCamera extends Handler {

		private static final int MSG_AUTO_FOCUS = 1;

		private static double MIN_RATIO_DIFF_PERCENT = 0.1;
		/**
		* The max allowed difference between picture size ratio and preview size ratio.
		* Uses to filter the picture sizes of similar preview size ratio, for example, if a preview
		* size is 1920x1440, MAX_RATIO_DIFF 0.1 could allow picture size of 720x480 or 352x288 or
		* 176x44 but not 1920x1080.
		*/
		private static double MAX_RATIO_DIFF = 0.1;

		private static long AUTOFOCUS_INTERVAL_MS = 1500L;

		private static Map<DecodeHintType, List<BarcodeFormat>> HINTS = new ArrayMap<>();
		@@ -168,7 +175,8 @@ public class QrCamera extends Handler {
		mParameters = mCamera.getParameters();
		mPreviewSize = getBestPreviewSize(mParameters);
		mParameters.setPreviewSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
		mParameters.setPictureSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
		Size pictureSize = getBestPictureSize(mParameters);
		mParameters.setPreviewSize(pictureSize.getWidth(), pictureSize.getHeight());

		if (mParameters.getSupportedFlashModes().contains(Parameters.FLASH_MODE_OFF)) {
		mParameters.setFlashMode(Parameters.FLASH_MODE_OFF);
		@@ -338,8 +346,8 @@ public class QrCamera extends Handler {

		private QrYuvLuminanceSource getFrameImage(byte[] imageData) {
		final Rect frame = mScannerCallback.getFramePosition(mPreviewSize, mCameraOrientation);
		final Camera.Size size = mParameters.getPictureSize();
		QrYuvLuminanceSource image = new QrYuvLuminanceSource(imageData, size.width, size.height);
		final QrYuvLuminanceSource image = new QrYuvLuminanceSource(imageData,
		mPreviewSize.getWidth(), mPreviewSize.getHeight());
		return (QrYuvLuminanceSource)
		image.crop(frame.left, frame.top, frame.width(), frame.height());
		}
		@@ -379,6 +387,48 @@ public class QrCamera extends Handler {
		return bestChoice;
		}

		/** Get best picture size from the list of camera supported picture sizes. Compares the
		* picture size and aspect ratio to choose the best one. */
		private Size getBestPictureSize(Camera.Parameters parameters) {
		final Camera.Size previewSize = parameters.getPreviewSize();
		final double previewRatio = getRatio(previewSize.width, previewSize.height);
		List<Size> bestChoices = new ArrayList<>();
		final List<Size> similarChoices = new ArrayList<>();

		// Filter by ratio
		for (Camera.Size size : parameters.getSupportedPictureSizes()) {
		double ratio = getRatio(size.width, size.height);
		if (ratio == previewRatio) {
		bestChoices.add(new Size(size.width, size.height));
		} else if (Math.abs(ratio - previewRatio) < MAX_RATIO_DIFF) {
		similarChoices.add(new Size(size.width, size.height));
		}
		}

		if (bestChoices.size() == 0 && similarChoices.size() == 0) {
		Log.d(TAG, "No proper picture size, return default picture size");
		Camera.Size defaultPictureSize = parameters.getPictureSize();
		return new Size(defaultPictureSize.width, defaultPictureSize.height);
		}

		if (bestChoices.size() == 0) {
		bestChoices = similarChoices;
		}

		// Get the best by area
		int bestAreaDifference = Integer.MAX_VALUE;
		Size bestChoice = null;
		final int previewArea = previewSize.width * previewSize.height;
		for (Size size : bestChoices) {
		int areaDifference = Math.abs(size.getWidth() * size.getHeight() - previewArea);
		if (areaDifference < bestAreaDifference) {
		bestAreaDifference = areaDifference;
		bestChoice = size;
		}
		}
		return bestChoice;
		}

		private double getRatio(double x, double y) {
		return (x < y) ? x / y : y / x;
		}