/**
* Get the largest possible zoom ratio (normalized to {@code 1.0f} and higher) that the camera can
* support.
*
* <p>If the camera does not support zoom, it always returns {@code 1.0f}.
*
* @param params non-{@code null} camera api1 parameters
* @return normalized max zoom ratio, at least {@code 1.0f}
*/
public static float getMaxZoomRatio(Camera.Parameters params) {
if (!params.isZoomSupported()) {
return 1.0f; // no zoom
}
List<Integer> zoomRatios = params.getZoomRatios(); // sorted smallest->largest
int zoom = zoomRatios.get(zoomRatios.size() - 1); // largest zoom ratio
float zoomRatio = zoom * 1.0f / ZOOM_RATIO_MULTIPLIER; // normalize to 1.0 and smaller
return zoomRatio;
}
public void zoom(int step) {
Camera.Parameters parameters = mCamera.getParameters();
if (!parameters.isZoomSupported()) return;
int zoom = parameters.getZoom() + step;
if (zoom > parameters.getMaxZoom()) zoom = parameters.getMaxZoom();
else if (zoom < 0) zoom = 0;
parameters.setZoom(zoom);
String str = parameters.getZoomRatios().get(zoom) + "%";
zoomText.setText(str);
mCamera.setParameters(parameters);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
boolean useFrontCamera = getArguments().getBoolean(FRONT_CAMERA, false);
camera = getCameraInstance(useFrontCamera);
if (camera == null) {
return;
}
initScreenParams();
parameters = camera.getParameters();
zoomRatios = parameters.getZoomRatios();
zoomIndex = minZoomIndex = 0;
maxZoomIndex = parameters.getMaxZoom();
previewSizes = buildPreviewSizesRatioMap(parameters.getSupportedPreviewSizes());
pictureSizes = buildPictureSizesRatioMap(parameters.getSupportedPictureSizes());
List<String> sceneModes = parameters.getSupportedSceneModes();
if (sceneModes != null) {
for (String mode : sceneModes) {
if (mode.equals(Camera.Parameters.SCENE_MODE_HDR)) {
supportedHDR = true;
break;
}
}
}
// it returns false positive
/*getActivity().getApplicationContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);*/
List<String> flashModes = parameters.getSupportedFlashModes();
if (flashModes == null || flashModes.size() <= 1) {
/* Device has no flash */
supportedFlash = false;
} else {
supportedFlash = true;
}
if (CameraConst.DEBUG) {
Timber.d("PictureSizesRatioMap:");
for (Ratio r : pictureSizes.keySet()) {
Timber.d(r.toString() + ":");
for (Quality q : pictureSizes.get(r).keySet()) {
Camera.Size size = pictureSizes.get(r).get(q);
if (size != null) {
Timber.d(q.toString() + ": " + size.width + "x" + size.height);
}
}
}
}
expandParams(getArguments());
initParams();
}
private static Integer indexOfClosestZoom(Camera.Parameters parameters, double targetZoomRatio) {
List<Integer> ratios = parameters.getZoomRatios();
Log.i(TAG, "Zoom ratios: " + ratios);
int maxZoom = parameters.getMaxZoom();
if (ratios == null || ratios.isEmpty() || ratios.size() != maxZoom + 1) {
Log.w(TAG, "Invalid zoom ratios!");
return null;
}
double target100 = 100.0 * targetZoomRatio;
double smallestDiff = Double.POSITIVE_INFINITY;
int closestIndex = 0;
for (int i = 0; i < ratios.size(); i++) {
double diff = Math.abs(ratios.get(i) - target100);
if (diff < smallestDiff) {
smallestDiff = diff;
closestIndex = i;
}
}
Log.i(TAG, "Chose zoom ratio of " + (ratios.get(closestIndex) / 100.0));
return closestIndex;
}
/**
* Get the available 'crop' (zoom) rectangles for this camera.
*
* <p>When zoom is supported, this will return a list of {@code 1 + #getMaxZoom} size, where each
* crop rectangle corresponds to a zoom ratio (and is centered at the middle).
*
* <p>Each crop rectangle is changed to have the same aspect ratio as {@code streamSize}, by
* shrinking the rectangle if necessary.
*
* <p>To get the reported crop region when applying a zoom to the sensor, use {@code streamSize} =
* {@code activeArray size}.
*
* @param params non-{@code null} camera api1 parameters
* @param activeArray active array dimensions, in sensor space
* @param streamSize stream size dimensions, in pixels
* @return a list of available zoom rectangles, sorted from least zoomed to most zoomed
*/
private static List<Rect> getAvailableCropRectangles(
Camera.Parameters params, Rect activeArray, Size streamSize) {
checkNotNull(params, "params must not be null");
checkNotNull(activeArray, "activeArray must not be null");
checkNotNull(streamSize, "streamSize must not be null");
// TODO: change all uses of Rect activeArray to Size activeArray,
// since we want the crop to be active-array relative, not pixel-array relative
Rect unzoomedStreamCrop = getPreviewCropRectangleUnzoomed(activeArray, streamSize);
if (!params.isZoomSupported()) {
// Trivial case: No zoom -> only support the full size as the crop region
return new ArrayList<>(Arrays.asList(unzoomedStreamCrop));
}
List<Rect> zoomCropRectangles = new ArrayList<>(params.getMaxZoom() + 1);
Matrix scaleMatrix = new Matrix();
RectF scaledRect = new RectF();
for (int zoom : params.getZoomRatios()) {
float shrinkRatio = ZOOM_RATIO_MULTIPLIER * 1.0f / zoom; // normalize to 1.0 and smaller
// set scaledRect to unzoomedStreamCrop
ParamsUtils.convertRectF(unzoomedStreamCrop, /*out*/ scaledRect);
scaleMatrix.setScale(
shrinkRatio, shrinkRatio, activeArray.exactCenterX(), activeArray.exactCenterY());
scaleMatrix.mapRect(scaledRect);
Rect intRect = ParamsUtils.createRect(scaledRect);
// Round the rect corners towards the nearest integer values
zoomCropRectangles.add(intRect);
}
return zoomCropRectangles;
}