mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2025-12-21 01:36:02 +08:00
100 lines
3.3 KiB
Dart
100 lines
3.3 KiB
Dart
// MIT License
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//
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// Copyright (c) 2021 Yrom Wang
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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import 'dart:ui' as ui;
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import 'package:flutter/foundation.dart';
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import 'package:flutter/painting.dart';
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import 'package:crypto/crypto.dart';
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/// Decodes the given [image] (raw image pixel data) as an image ('dart:ui')
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class RawImageProvider extends ImageProvider<RawImageKey> {
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final RawImageData image;
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final double? scale;
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final int? targetWidth;
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final int? targetHeight;
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RawImageProvider(this.image, {this.scale = 1.0, this.targetWidth, this.targetHeight});
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@override
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ImageStreamCompleter loadImage(RawImageKey key, ImageDecoderCallback decode) {
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return MultiFrameImageStreamCompleter(
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codec: _loadAsync(key),
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scale: scale ?? 1.0,
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debugLabel: 'RawImageProvider(${describeIdentity(key)})',
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);
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}
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@override
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Future<RawImageKey> obtainKey(ImageConfiguration configuration) {
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return SynchronousFuture(image._obtainKey());
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}
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/// see [ui.decodeImageFromPixels]
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Future<ui.Codec> _loadAsync(RawImageKey key) async {
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assert(key == image._obtainKey());
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// rgba8888 pixels
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var buffer = await ui.ImmutableBuffer.fromUint8List(image.pixels);
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final descriptor = ui.ImageDescriptor.raw(
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buffer,
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width: image.width,
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height: image.height,
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pixelFormat: image.pixelFormat,
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);
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return descriptor.instantiateCodec(targetWidth: targetWidth, targetHeight: targetHeight);
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}
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}
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class RawImageKey {
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final int w;
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final int h;
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final int format;
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final Digest dataHash;
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RawImageKey(this.w, this.h, this.format, this.dataHash);
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@override
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bool operator ==(Object other) {
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if (identical(this, other)) return true;
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return other is RawImageKey && other.w == w && other.h == h && other.format == format && other.dataHash == dataHash;
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}
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@override
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int get hashCode {
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return Object.hash(w, h, format, dataHash.hashCode);
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}
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}
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/// Raw pixels data of an image
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class RawImageData {
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final Uint8List pixels;
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final int width;
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final int height;
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final ui.PixelFormat pixelFormat;
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RawImageData(this.pixels, this.width, this.height, {this.pixelFormat = ui.PixelFormat.rgba8888});
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RawImageKey? _key;
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RawImageKey _obtainKey() {
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return _key ??= RawImageKey(width, height, pixelFormat.index, md5.convert(pixels));
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}
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}
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