mirror of
https://github.com/flutter/flutter
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102 lines
3.3 KiB
Dart
102 lines
3.3 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:math' as math;
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import 'dart:ui' as ui;
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import 'dart:typed_data';
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import 'package:flutter/services.dart';
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import 'package:mojo/bindings.dart' as bindings;
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import 'package:mojo/core.dart' as core;
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import 'package:sky_services/pointer/pointer.mojom.dart';
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Duration timeBase = null;
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ui.Image image = null;
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String url1 = "https://raw.githubusercontent.com/dart-lang/logos/master/logos_and_wordmarks/dart-logo.png";
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String url2 = "http://i2.kym-cdn.com/photos/images/facebook/000/581/296/c09.jpg";
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ui.Picture paint(ui.Rect paintBounds, double delta) {
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ui.PictureRecorder recorder = new ui.PictureRecorder();
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ui.Canvas canvas = new ui.Canvas(recorder, paintBounds);
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canvas.translate(paintBounds.width / 2.0, paintBounds.height / 2.0);
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canvas.rotate(math.PI * delta / 1800);
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canvas.scale(0.2, 0.2);
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ui.Paint paint = new ui.Paint()..color = const ui.Color.fromARGB(255, 0, 255, 0);
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// Draw image
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if (image != null)
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canvas.drawImage(image, new ui.Point(-image.width / 2.0, -image.height / 2.0), paint);
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// Draw cut out of image
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canvas.rotate(math.PI * delta / 1800);
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if (image != null) {
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var w = image.width.toDouble();
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var h = image.width.toDouble();
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canvas.drawImageRect(image,
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new ui.Rect.fromLTRB(w * 0.25, h * 0.25, w * 0.75, h * 0.75),
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new ui.Rect.fromLTRB(-w / 4.0, -h / 4.0, w / 4.0, h / 4.0),
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paint);
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}
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return recorder.endRecording();
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}
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ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
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final double devicePixelRatio = ui.window.devicePixelRatio;
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ui.Rect sceneBounds = new ui.Rect.fromLTWH(0.0, 0.0, ui.window.size.width * devicePixelRatio, ui.window.size.height * devicePixelRatio);
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Float64List deviceTransform = new Float64List(16)
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..[0] = devicePixelRatio
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..[5] = devicePixelRatio
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..[10] = 1.0
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..[15] = 1.0;
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ui.SceneBuilder sceneBuilder = new ui.SceneBuilder(sceneBounds)
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..pushTransform(deviceTransform)
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..addPicture(ui.Offset.zero, picture, paintBounds)
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..pop();
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return sceneBuilder.build();
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}
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void beginFrame(Duration timeStamp) {
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if (timeBase == null)
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timeBase = timeStamp;
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double delta = (timeStamp - timeBase).inMicroseconds / Duration.MICROSECONDS_PER_MILLISECOND;
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ui.Rect paintBounds = ui.Point.origin & ui.window.size;
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ui.Picture picture = paint(paintBounds, delta);
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ui.Scene scene = composite(picture, paintBounds);
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ui.window.render(scene);
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ui.window.scheduleFrame();
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}
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void handleImageLoad(result) {
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if (result != image) {
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print("${result.width}x${result.width} image loaded!");
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image = result;
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ui.window.scheduleFrame();
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} else {
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print("Existing image was loaded again");
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}
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}
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void handlePointerPacket(ByteData serializedPacket) {
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bindings.Message message = new bindings.Message(
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serializedPacket, <core.MojoHandle>[],
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serializedPacket.lengthInBytes, 0);
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PointerPacket packet = PointerPacket.deserialize(message);
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for (Pointer pointer in packet.pointers) {
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if (pointer.type == PointerType.UP) {
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imageCache.load(url2).first.then(handleImageLoad);
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}
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}
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}
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void main() {
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imageCache.load(url1).first.then(handleImageLoad);
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ui.window.onPointerPacket = handlePointerPacket;
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ui.window.onBeginFrame = beginFrame;
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}
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