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WIP: added color adjust feature #62

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WIP: added color adjust feature #62

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7c3ea82
added image adjustment feature
Vishveshwara Jun 16, 2025
7bbab58
applied dart formatting
Vishveshwara Jun 16, 2025
757ccac
WIP : added color adjust filter
Vishveshwara Jun 18, 2025
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2 changes: 2 additions & 0 deletions lib/main.dart
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import 'package:flutter/material.dart';
import 'package:magic_epaper_app/provider/color_adjustment_provider.dart';
import 'package:magic_epaper_app/provider/getitlocator.dart';
import 'package:magic_epaper_app/provider/image_loader.dart';
import 'package:provider/provider.dart';
Expand All @@ -8,6 +9,7 @@ void main() {
setupLocator();
runApp(MultiProvider(providers: [
ChangeNotifierProvider(create: (context) => ImageLoader()),
ChangeNotifierProvider(create: (context) => ColorAdjustmentProvider()),
], child: const MyApp()));
}

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16 changes: 16 additions & 0 deletions lib/provider/color_adjustment_provider.dart
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@@ -0,0 +1,16 @@
import 'package:flutter/material.dart';

class ColorAdjustmentProvider extends ChangeNotifier {
Map<Color, double> _weights = {};

Map<Color, double> get weights => _weights;

void resetWeights(List<Color> colors) {
_weights = {for (var color in colors) color: 1.0};
Comment on lines +8 to +9
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issue (bug_risk): resetWeights does not notify listeners.

Since notifyListeners() is not called after updating _weights, UI components depending on this data may not refresh. Please add notifyListeners() after resetting the weights.

}

void updateWeights(Map<Color, double> newWeights) {
_weights = newWeights;
notifyListeners();
}
}
3 changes: 2 additions & 1 deletion lib/util/epd/epd.dart
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Expand Up @@ -7,7 +7,8 @@ import 'package:magic_epaper_app/util/image_processing/image_processing.dart';
abstract class Epd {
int get width;
int get height;
final processingMethods = <img.Image Function(img.Image)>[];
final processingMethods =
<img.Image Function(img.Image, Map<Color, double>)>[];
String get name;
String get modelId;
String get imgPath;
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4 changes: 3 additions & 1 deletion lib/util/image_editor_utils.dart
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Original file line number Diff line number Diff line change
@@ -1,9 +1,11 @@
import 'dart:ui';
import 'package:image/image.dart' as img;
import 'package:magic_epaper_app/util/epd/epd.dart';

List<img.Image> processImages({
required img.Image originalImage,
required Epd epd,
required Map<Color, double> weights,
}) {
final List<img.Image> processedImgs = [];

Expand All @@ -14,7 +16,7 @@ List<img.Image> processImages({
);

for (final method in epd.processingMethods) {
processedImgs.add(method(transformed));
processedImgs.add(method(transformed, weights));
}

return processedImgs;
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51 changes: 33 additions & 18 deletions lib/util/image_processing/image_processing.dart
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Expand Up @@ -5,81 +5,95 @@ import 'extract_quantizer.dart';
import 'remap_quantizer.dart';

class ImageProcessing {
static img.Image bwFloydSteinbergDither(img.Image orgImg) {
static img.Image bwFloydSteinbergDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);
return img.ditherImage(image, quantizer: img.BinaryQuantizer());
}

static img.Image bwFalseFloydSteinbergDither(img.Image orgImg) {
static img.Image bwFalseFloydSteinbergDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);
return img.ditherImage(image,
quantizer: img.BinaryQuantizer(),
kernel: img.DitherKernel.falseFloydSteinberg);
}

static img.Image bwStuckiDither(img.Image orgImg) {
static img.Image bwStuckiDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);
return img.ditherImage(image,
quantizer: img.BinaryQuantizer(), kernel: img.DitherKernel.stucki);
}

static img.Image bwAtkinsonDither(img.Image orgImg) {
static img.Image bwAtkinsonDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);
return img.ditherImage(image,
quantizer: img.BinaryQuantizer(), kernel: img.DitherKernel.atkinson);
}

static img.Image bwThreshold(img.Image orgImg) {
static img.Image bwThreshold(img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);
return img.ditherImage(image,
quantizer: img.BinaryQuantizer(), kernel: img.DitherKernel.none);
}

static img.Image bwHalftoneDither(img.Image orgImg) {
static img.Image bwHalftoneDither(
img.Image orgImg, Map<Color, double> weights) {
final image = img.Image.from(orgImg);
img.grayscale(image);
img.colorHalftone(image, size: 3);
return img.ditherImage(image, quantizer: img.BinaryQuantizer());
}

static img.Image bwrHalftone(img.Image orgImg) {
static img.Image bwrHalftone(img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);

img.colorHalftone(image, size: 3);
return img.ditherImage(image,
quantizer: RemapQuantizer(palette: _createTriColorPalette()),
quantizer:
RemapQuantizer(palette: _createTriColorPalette(), weights: weights),
kernel: img.DitherKernel.floydSteinberg);
}

static img.Image bwrFloydSteinbergDither(img.Image orgImg) {
static img.Image bwrFloydSteinbergDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);

return img.ditherImage(image,
quantizer: RemapQuantizer(palette: _createTriColorPalette()),
quantizer:
RemapQuantizer(palette: _createTriColorPalette(), weights: weights),
kernel: img.DitherKernel.floydSteinberg);
}

static img.Image bwrFalseFloydSteinbergDither(img.Image orgImg) {
static img.Image bwrFalseFloydSteinbergDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);

return img.ditherImage(image,
quantizer: RemapQuantizer(palette: _createTriColorPalette()),
quantizer:
RemapQuantizer(palette: _createTriColorPalette(), weights: weights),
kernel: img.DitherKernel.falseFloydSteinberg);
}

static img.Image bwrStuckiDither(img.Image orgImg) {
static img.Image bwrStuckiDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);

return img.ditherImage(image,
quantizer: RemapQuantizer(palette: _createTriColorPalette()),
quantizer:
RemapQuantizer(palette: _createTriColorPalette(), weights: weights),
kernel: img.DitherKernel.stucki);
}

static img.Image bwrTriColorAtkinsonDither(img.Image orgImg) {
static img.Image bwrTriColorAtkinsonDither(
img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);

return img.ditherImage(image,
quantizer: RemapQuantizer(palette: _createTriColorPalette()),
quantizer:
RemapQuantizer(palette: _createTriColorPalette(), weights: weights),
kernel: img.DitherKernel.atkinson);
}

Expand All @@ -91,11 +105,12 @@ class ImageProcessing {
kernel: img.DitherKernel.none);
}

static img.Image bwrThreshold(img.Image orgImg) {
static img.Image bwrThreshold(img.Image orgImg, Map<Color, double> weights) {
var image = img.Image.from(orgImg);

return img.ditherImage(image,
quantizer: RemapQuantizer(palette: _createTriColorPalette()),
quantizer:
RemapQuantizer(palette: _createTriColorPalette(), weights: weights),
kernel: img.DitherKernel.none);
}
}
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14 changes: 12 additions & 2 deletions lib/util/image_processing/remap_quantizer.dart
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import 'package:image/image.dart' as img;
import 'dart:typed_data';
import 'package:flutter/material.dart';

class RemapQuantizer extends img.Quantizer {
@override
Expand All @@ -10,11 +11,12 @@ class RemapQuantizer extends img.Quantizer {
late final Uint8List _paletteR;
late final Uint8List _paletteG;
late final Uint8List _paletteB;
final Map<Color, double> weights;

final Map<int, int> _colorCache = {};
static const int _maxCacheSize = 1024;

RemapQuantizer({required this.palette}) {
RemapQuantizer({required this.palette, this.weights = const {}}) {
final numColors = palette.numColors;

_paletteR = Uint8List(numColors);
Expand Down Expand Up @@ -88,7 +90,15 @@ class RemapQuantizer extends img.Quantizer {
final dr = r - _paletteR[paletteIndex];
final dg = g - _paletteG[paletteIndex];
final db = b - _paletteB[paletteIndex];
return dr * dr + dg * dg + db * db;
final distanceSq = dr * dr + dg * dg + db * db;
final paletteColor = Color.fromARGB(255, _paletteR[paletteIndex],
_paletteG[paletteIndex], _paletteB[paletteIndex]);

final weight = weights[paletteColor] ?? 1.0;

if (weight <= 0) return 2147483647;

return (distanceSq / weight).round();
}

void _addToCache(int key, int value) {
Expand Down
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