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[iOS] fixed histogram

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This commit is contained in:
Vadim 2024-02-13 16:58:26 +01:00
parent b4be0cced3
commit 26619ce3de
1 changed files with 48 additions and 20 deletions
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68
lib/screens/metering/components/camera_container/components/camera_preview/components/histogram/widget_histogram.dart
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@ -1,6 +1,7 @@
import 'dart:math';
import 'package:camera/camera.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:lightmeter/res/dimens.dart';
@ -64,31 +65,58 @@ class _CameraHistogramState extends State<CameraHistogram> {
histogramG = List.filled(256, 0);
histogramB = List.filled(256, 0);
final int uvRowStride = image.planes[1].bytesPerRow;
final int uvPixelStride = image.planes[1].bytesPerPixel!;
for (int x = 0; x < image.width; x++) {
for (int y = 0; y < image.height; y++) {
final int uvIndex = uvPixelStride * (x / 2).floor() + uvRowStride * (y / 2).floor();
final int index = y * image.width + x;
final yp = image.planes[0].bytes[index];
final up = image.planes[1].bytes[uvIndex];
final vp = image.planes[2].bytes[uvIndex];
final r = yp + vp * 1436 / 1024 - 179;
final g = yp - up * 46549 / 131072 + 44 - vp * 93604 / 131072 + 91;
final b = yp + up * 1814 / 1024 - 227;
histogramR[r.round().clamp(0, 255)]++;
histogramG[g.round().clamp(0, 255)]++;
histogramB[b.round().clamp(0, 255)]++;
}
switch (defaultTargetPlatform) {
case TargetPlatform.android:
_yuv420toRgb(image);
case TargetPlatform.iOS:
_bgra8888toRgb(image);
default:
}
if (mounted) setState(() {});
});
}
void _yuv420toRgb(CameraImage image) {
final int uvRowStride = image.planes[1].bytesPerRow;
final int uvPixelStride = image.planes[1].bytesPerPixel!;
for (int x = 0; x < image.width; x++) {
for (int y = 0; y < image.height; y++) {
final int uvIndex = uvPixelStride * (x / 2).floor() + uvRowStride * (y / 2).floor();
final int index = y * image.width + x;
final yp = image.planes[0].bytes[index];
final up = image.planes[1].bytes[uvIndex];
final vp = image.planes[2].bytes[uvIndex];
final r = yp + vp * 1436 / 1024 - 179;
final g = yp - up * 46549 / 131072 + 44 - vp * 93604 / 131072 + 91;
final b = yp + up * 1814 / 1024 - 227;
histogramR[r.round().clamp(0, 255)]++;
histogramG[g.round().clamp(0, 255)]++;
histogramB[b.round().clamp(0, 255)]++;
}
}
}
void _bgra8888toRgb(CameraImage image) {
for (int i = 0; i < image.planes.first.bytes.length; i++) {
final int channel = i % 4;
switch (channel) {
case 3:
break;
case 2:
histogramR[image.planes.first.bytes[i]]++;
case 1:
histogramG[image.planes.first.bytes[i]]++;
case 0:
histogramB[image.planes.first.bytes[i]]++;
default:
}
}
}
}
class HistogramChannel extends StatelessWidget {