• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1/*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16import { Log } from '@ohos/common';
17import { RectF } from '../base/Rect';
18import { ImageFilterBase } from '../base/ImageFilterBase';
19import { PixelMapWrapper } from '../base/PixelMapWrapper';
20import { MathUtils } from './MathUtils';
21
22const TAG: string = 'editor_ImageFilterCrop';
23
24export class ImageFilterCrop extends ImageFilterBase {
25  private static readonly FILTER_NAME: string = 'FilterCrop';
26  private isFlipHorizontal: boolean = false;
27  private isFlipVertically: boolean = false;
28  private rotationAngle: number = 0;
29  private horizontalAngle: number = 0;
30  private cropRect: RectF = undefined;
31
32  constructor() {
33    super(ImageFilterCrop.FILTER_NAME);
34    this.cropRect = new RectF();
35  }
36
37  render(pixelMap: PixelMapWrapper): PixelMapWrapper {
38    Log.debug(TAG, `render input wrapper: ${JSON.stringify(pixelMap)}`);
39    let width = pixelMap.width;
40    let height = pixelMap.height;
41    let realCropRect = new RectF();
42    realCropRect.set(this.cropRect.left, this.cropRect.top, this.cropRect.right, this.cropRect.bottom);
43    MathUtils.revertRect(realCropRect, width, height);
44
45    let offWidth = realCropRect.getWidth();
46    let offHeight = realCropRect.getHeight();
47    let setting = new RenderingContextSettings(true);
48    let offCtx = new OffscreenCanvasRenderingContext2D(offWidth, offHeight, setting);
49    let tX = this.isFlipHorizontal ? -1 : 1;
50    let tY = this.isFlipVertically ? -1 : 1;
51
52    offCtx.save();
53    offCtx.translate(this.isFlipHorizontal ? offWidth : 0, this.isFlipVertically ? offHeight : 0);
54    offCtx.scale(tX, tY);
55
56    offCtx.translate(offWidth / 2, offHeight / 2);
57    offCtx.rotate(MathUtils.formulaAngle(this.rotationAngle * tX * tY + this.horizontalAngle));
58    offCtx.translate(-offWidth / 2, -offHeight / 2);
59    offCtx.translate(-realCropRect.left, -realCropRect.top);
60
61    offCtx.drawImage(pixelMap.pixelMap, 0, 0, width, height);
62    offCtx.restore();
63    let outputPixelMap = offCtx.getPixelMap(0, 0, offWidth, offHeight);
64    let output = new PixelMapWrapper(outputPixelMap, offWidth, offHeight);
65    Log.debug(TAG, `render output wrapper: ${JSON.stringify(output)}`);
66    return output;
67  }
68
69  setFlipHorizontal(isFlip: boolean) {
70    this.isFlipHorizontal = isFlip;
71  }
72
73  setFlipVertically(isFlip: boolean) {
74    this.isFlipVertically = isFlip;
75  }
76
77  setRotationAngle(angle: number) {
78    this.rotationAngle = angle;
79  }
80
81  setHorizontalAngle(angle: number) {
82    this.horizontalAngle = angle;
83  }
84
85  setCropRect(rect: RectF) {
86    this.cropRect.set(rect.left, rect.top, rect.right, rect.bottom);
87  }
88}