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52fd41bc88
I also fixed image_cache to not even bother to call ImageDecoder in the 404 case, but I also fixed CanvasImageDecoder not to blow up if the buffer is empty and its not able to allocate an ImageDecoder. Closes https://github.com/domokit/mojo/issues/229 R=abarth@chromium.org, jackson@google.com Review URL: https://codereview.chromium.org/1170413002.
45 lines
1.2 KiB
Dart
45 lines
1.2 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:sky';
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import 'dart:collection';
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import 'fetch.dart';
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import 'package:mojom/mojo/url_response.mojom.dart';
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final HashMap<String, List<ImageDecoderCallback>> _pendingRequests =
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new HashMap<String, List<ImageDecoderCallback>>();
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final HashMap<String, Image> _completedRequests =
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new HashMap<String, Image>();
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void _loadComplete(url, image) {
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_completedRequests[url] = image;
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_pendingRequests[url].forEach((c) => c(image));
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_pendingRequests.remove(url);
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}
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void load(String url, ImageDecoderCallback callback) {
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Image result = _completedRequests[url];
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if (result != null) {
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callback(_completedRequests[url]);
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return;
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}
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bool newRequest = false;
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_pendingRequests.putIfAbsent(url, () {
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newRequest = true;
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return new List<ImageDecoderCallback>();
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}).add(callback);
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if (newRequest) {
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fetchUrl(url).then((UrlResponse response) {
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if (response.statusCode >= 400) {
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_loadComplete(url, null);
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return;
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}
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new ImageDecoder(response.body.handle.h,
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(image) => _loadComplete(url, image));
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});
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}
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}
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