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/**
* @license
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the 'License');
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an 'AS IS' BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {GrDiffBuilderSideBySide} from './gr-diff-builder-side-by-side';
import {ImageInfo} from '../../../types/common';
import {DiffInfo, DiffPreferencesInfo} from '../../../types/diff';
import {GrEndpointParam} from '../../../elements/plugins/gr-endpoint-param/gr-endpoint-param';
import {RenderPreferences} from '../../../api/diff';
import '../gr-diff-image-viewer/gr-image-viewer';
import {GrImageViewer} from '../gr-diff-image-viewer/gr-image-viewer';
import {createElementDiff} from '../gr-diff/gr-diff-utils';
// MIME types for images we allow showing. Do not include SVG, it can contain
// arbitrary JavaScript.
const IMAGE_MIME_PATTERN = /^image\/(bmp|gif|x-icon|jpeg|jpg|png|tiff|webp)$/;
export class GrDiffBuilderImage extends GrDiffBuilderSideBySide {
constructor(
diff: DiffInfo,
prefs: DiffPreferencesInfo,
outputEl: HTMLElement,
private readonly _baseImage: ImageInfo | null,
private readonly _revisionImage: ImageInfo | null,
renderPrefs?: RenderPreferences,
private readonly _useNewImageDiffUi: boolean = false
) {
super(diff, prefs, outputEl, [], renderPrefs);
}
public renderDiff() {
const section = createElementDiff('tbody', 'image-diff');
if (this._useNewImageDiffUi) {
this._emitImageViewer(section);
this.outputEl.appendChild(section);
} else {
this._emitImagePair(section);
this._emitImageLabels(section);
this.outputEl.appendChild(section);
this.outputEl.appendChild(this._createEndpoint());
}
}
private _createEndpoint() {
const tbody = createElementDiff('tbody');
const tr = createElementDiff('tr');
const td = createElementDiff('td');
// TODO(kaspern): Support blame for image diffs and remove the hardcoded 4
// column limit.
td.setAttribute('colspan', '4');
const endpointDomApi = createElementDiff('gr-endpoint-decorator');
endpointDomApi.setAttribute('name', 'image-diff');
endpointDomApi.appendChild(
this._createEndpointParam('baseImage', this._baseImage)
);
endpointDomApi.appendChild(
this._createEndpointParam('revisionImage', this._revisionImage)
);
td.appendChild(endpointDomApi);
tr.appendChild(td);
tbody.appendChild(tr);
return tbody;
}
private _createEndpointParam(name: string, value: ImageInfo | null) {
const endpointParam = createElementDiff(
'gr-endpoint-param'
) as GrEndpointParam;
endpointParam.name = name;
endpointParam.value = value;
return endpointParam;
}
private _emitImageViewer(section: HTMLElement) {
const tr = createElementDiff('tr');
const td = createElementDiff('td');
// TODO(hermannloose): Support blame for image diffs, see above.
td.setAttribute('colspan', '4');
const imageViewer = createElementDiff('gr-image-viewer') as GrImageViewer;
imageViewer.baseUrl = this._getImageSrc(this._baseImage);
imageViewer.revisionUrl = this._getImageSrc(this._revisionImage);
imageViewer.automaticBlink =
!!this.renderPrefs?.image_diff_prefs?.automatic_blink;
td.appendChild(imageViewer);
tr.appendChild(td);
section.appendChild(tr);
}
private _getImageSrc(image: ImageInfo | null): string {
return image && IMAGE_MIME_PATTERN.test(image.type)
? `data:${image.type};base64,${image.body}`
: '';
}
private _emitImagePair(section: HTMLElement) {
const tr = createElementDiff('tr');
tr.appendChild(createElementDiff('td', 'left lineNum blank'));
tr.appendChild(this._createImageCell(this._baseImage, 'left', section));
tr.appendChild(createElementDiff('td', 'right lineNum blank'));
tr.appendChild(
this._createImageCell(this._revisionImage, 'right', section)
);
section.appendChild(tr);
}
private _createImageCell(
image: ImageInfo | null,
className: string,
section: HTMLElement
) {
const td = createElementDiff('td', className);
const src = this._getImageSrc(image);
if (image && src) {
const imageEl = createElementDiff('img') as HTMLImageElement;
imageEl.onload = () => {
image._height = imageEl.naturalHeight;
image._width = imageEl.naturalWidth;
this._updateImageLabel(section, className, image);
};
imageEl.addEventListener('error', (e: Event) => {
imageEl.remove();
td.textContent = '[Image failed to load] ' + e.type;
});
imageEl.setAttribute('src', src);
td.appendChild(imageEl);
}
return td;
}
private _updateImageLabel(
section: HTMLElement,
className: string,
image: ImageInfo
) {
const label = section.querySelector(
'.' + className + ' span.label'
) as HTMLElement;
this._setLabelText(label, image);
}
private _setLabelText(label: HTMLElement, image: ImageInfo | null) {
label.textContent = _getImageLabel(image);
}
private _emitImageLabels(section: HTMLElement) {
const tr = createElementDiff('tr');
let addNamesInLabel = false;
if (
this._baseImage &&
this._revisionImage &&
this._baseImage._name !== this._revisionImage._name
) {
addNamesInLabel = true;
}
tr.appendChild(createElementDiff('td', 'left lineNum blank'));
let td = createElementDiff('td', 'left');
let label = createElementDiff('label');
let nameSpan;
let labelSpan = createElementDiff('span', 'label');
if (addNamesInLabel) {
nameSpan = createElementDiff('span', 'name');
nameSpan.textContent = this._baseImage?._name ?? '';
label.appendChild(nameSpan);
label.appendChild(createElementDiff('br'));
}
this._setLabelText(labelSpan, this._baseImage);
label.appendChild(labelSpan);
td.appendChild(label);
tr.appendChild(td);
tr.appendChild(createElementDiff('td', 'right lineNum blank'));
td = createElementDiff('td', 'right');
label = createElementDiff('label');
labelSpan = createElementDiff('span', 'label');
if (addNamesInLabel) {
nameSpan = createElementDiff('span', 'name');
nameSpan.textContent = this._revisionImage?._name ?? '';
label.appendChild(nameSpan);
label.appendChild(createElementDiff('br'));
}
this._setLabelText(labelSpan, this._revisionImage);
label.appendChild(labelSpan);
td.appendChild(label);
tr.appendChild(td);
section.appendChild(tr);
}
override updateRenderPrefs(renderPrefs: RenderPreferences) {
const imageViewer = this.outputEl.querySelector(
'gr-image-viewer'
) as GrImageViewer;
if (this._useNewImageDiffUi && imageViewer) {
imageViewer.automaticBlink =
!!renderPrefs?.image_diff_prefs?.automatic_blink;
}
}
}
function _getImageLabel(image: ImageInfo | null) {
if (image) {
const type = image.type ?? image._expectedType;
if (image._width && image._height) {
return `${image._width}×${image._height} ${type}`;
} else {
return type;
}
}
return 'No image';
}