private static List<Camera.Area> convertMeteringRegionsToLegacy(
Rect activeArray,
ParameterUtils.ZoomData zoomData,
MeteringRectangle[] meteringRegions,
int maxNumMeteringAreas,
String regionName) {
if (meteringRegions == null || maxNumMeteringAreas <= 0) {
if (maxNumMeteringAreas > 0) {
return Arrays.asList(ParameterUtils.CAMERA_AREA_DEFAULT);
} else {
return null;
}
}
// Add all non-zero weight regions to the list
List<MeteringRectangle> meteringRectangleList = new ArrayList<>();
for (MeteringRectangle rect : meteringRegions) {
if (rect.getMeteringWeight() != MeteringRectangle.METERING_WEIGHT_DONT_CARE) {
meteringRectangleList.add(rect);
}
}
if (meteringRectangleList.size() == 0) {
Log.w(TAG, "Only received metering rectangles with weight 0.");
return Arrays.asList(ParameterUtils.CAMERA_AREA_DEFAULT);
}
// Ignore any regions beyond our maximum supported count
int countMeteringAreas = Math.min(maxNumMeteringAreas, meteringRectangleList.size());
List<Camera.Area> meteringAreaList = new ArrayList<>(countMeteringAreas);
for (int i = 0; i < countMeteringAreas; ++i) {
MeteringRectangle rect = meteringRectangleList.get(i);
ParameterUtils.MeteringData meteringData =
ParameterUtils.convertMeteringRectangleToLegacy(activeArray, rect, zoomData);
meteringAreaList.add(meteringData.meteringArea);
}
if (maxNumMeteringAreas < meteringRectangleList.size()) {
Log.w(
TAG,
"convertMeteringRegionsToLegacy - Too many requested "
+ regionName
+ " regions, ignoring all beyond the first "
+ maxNumMeteringAreas);
}
if (VERBOSE) {
Log.v(
TAG,
"convertMeteringRegionsToLegacy - "
+ regionName
+ " areas = "
+ ParameterUtils.stringFromAreaList(meteringAreaList));
}
return meteringAreaList;
}
