492 lines
15 KiB
JavaScript
492 lines
15 KiB
JavaScript
import { CompositeCommand } from "./Command.js";
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import { AddLayerCommand, CreateImageLayerCommand } from "./LayerCommands.js";
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import { ToolCommand } from "./ToolCommands.js";
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import { ClearSelectionCommand } from "./SelectionCommands.js";
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import { createLayer, LayerType, OperationType } from "../utils/layerHelper.js";
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//import { fabric } from "fabric-with-all";
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/**
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* 套索抠图命令
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* 实现将选区内容抠图到新图层的功能
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*/
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export class LassoCutoutCommand extends CompositeCommand {
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constructor(options = {}) {
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super([], {
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name: "套索抠图",
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description: "将选区抠图到新图层",
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});
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this.canvas = options.canvas;
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this.layerManager = options.layerManager;
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this.selectionManager = options.selectionManager;
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this.toolManager = options.toolManager;
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this.sourceLayerId = options.sourceLayerId;
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this.newLayerName = options.newLayerName || "抠图";
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this.newLayerId = null;
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this.cutoutImageUrl = null;
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this.fabricImage = null;
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this.executedCommands = [];
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// 高清截图选项
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this.highResolutionEnabled = options.highResolutionEnabled !== false; // 默认启用
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this.baseResolutionScale = options.baseResolutionScale || 4; // 基础分辨率倍数，提高到4倍获得更清晰的图像
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}
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async execute() {
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if (!this.canvas || !this.layerManager || !this.selectionManager) {
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console.error("无法执行套索抠图：参数无效");
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return false;
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}
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try {
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this.executedCommands = [];
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// 获取选区
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const selectionObject = this.selectionManager.getSelectionObject();
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if (!selectionObject) {
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console.error("无法执行套索抠图：当前没有选区");
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return false;
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}
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// 确定源图层
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const sourceLayer = this.layerManager.getActiveLayer();
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if (!sourceLayer || sourceLayer.fabricObjects.length === 0) {
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console.error("无法执行套索抠图：源图层无效");
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return false;
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}
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// 获取选区边界信息用于后续定位
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const selectionBounds = selectionObject.getBoundingRect(true, true);
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// 执行在当前画布上的抠图操作
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this.cutoutImageUrl = await this._performCutout(
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sourceLayer,
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selectionObject
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);
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if (!this.cutoutImageUrl) {
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console.error("抠图失败");
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return false;
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}
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// 创建fabric图像对象，传递选区边界信息
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this.fabricImage = await this._createFabricImage(
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this.cutoutImageUrl,
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selectionBounds
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);
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if (!this.fabricImage) {
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console.error("创建图像对象失败");
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return false;
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}
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// 1. 创建图像图层命令
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const createImageLayerCmd = new CreateImageLayerCommand({
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layerManager: this.layerManager,
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fabricImage: this.fabricImage,
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toolManager: this.toolManager,
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layerName: this.newLayerName,
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});
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// 执行创建图像图层命令
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const result = await createImageLayerCmd.execute();
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this.newLayerId = createImageLayerCmd.newLayerId;
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this.executedCommands.push(createImageLayerCmd);
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// 2. 清除选区命令
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const clearSelectionCmd = new ClearSelectionCommand({
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canvas: this.canvas,
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selectionManager: this.selectionManager,
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});
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// 执行清除选区命令
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await clearSelectionCmd.execute();
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this.executedCommands.push(clearSelectionCmd);
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console.log(`套索抠图完成，新图层ID: ${this.newLayerId}`);
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return {
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newLayerId: this.newLayerId,
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cutoutImageUrl: this.cutoutImageUrl,
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};
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} catch (error) {
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console.error("套索抠图过程中出错:", error);
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// 如果已经创建了新图层，需要进行清理
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if (this.newLayerId) {
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try {
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await this.layerManager.removeLayer(this.newLayerId);
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} catch (cleanupError) {
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console.warn("清理新图层失败:", cleanupError);
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}
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}
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throw error;
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}
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}
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async undo() {
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try {
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// 逆序撤销所有已执行的命令
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for (let i = this.executedCommands.length - 1; i >= 0; i--) {
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const command = this.executedCommands[i];
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if (command && typeof command.undo === "function") {
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await command.undo();
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}
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}
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this.executedCommands = [];
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this.newLayerId = null;
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this.cutoutImageUrl = null;
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this.fabricImage = null;
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return true;
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} catch (error) {
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console.error("撤销套索抠图失败:", error);
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return false;
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}
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}
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/**
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* 在当前画布上执行抠图操作
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* @param {Object} sourceLayer 源图层
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* @param {Object} selectionObject 选区对象
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* @returns {String} 抠图结果的DataURL
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* @private
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*/
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async _performCutout(sourceLayer, selectionObject) {
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try {
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console.log("=== 开始在当前画布执行抠图 ===");
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// 获取选区边界
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const selectionBounds = selectionObject.getBoundingRect(true, true);
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console.log(
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`选区边界: left=${selectionBounds.left}, top=${selectionBounds.top}, width=${selectionBounds.width}, height=${selectionBounds.height}`
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);
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// 保存画布当前状态
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const originalActiveObject = this.canvas.getActiveObject();
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const originalSelection = this.canvas.selection;
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// 临时禁用画布选择
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this.canvas.selection = false;
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this.canvas.discardActiveObject();
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let tempGroup = null;
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let originalObjects = [];
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try {
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// 收集源图层中的可见对象
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const visibleObjects = sourceLayer.fabricObjects.filter(
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(obj) => obj.visible
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);
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console.log(`源图层可见对象数量: ${visibleObjects.length}`);
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if (visibleObjects.length === 0) {
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throw new Error("源图层没有可见对象");
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}
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// 如果只有一个对象且已经是组，直接使用
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if (visibleObjects.length === 1 && visibleObjects[0].type === "group") {
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tempGroup = visibleObjects[0];
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console.log("使用现有组对象");
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} else {
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// 创建临时组
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console.log("创建临时组...");
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// 记录原始对象的位置和状态，用于后续恢复
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originalObjects = visibleObjects.map((obj) => ({
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object: obj,
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originalLeft: obj.left,
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originalTop: obj.top,
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originalAngle: obj.angle,
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originalScaleX: obj.scaleX,
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originalScaleY: obj.scaleY,
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}));
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// 不需要从画布移除原对象，直接创建组
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// 克隆对象来创建组，避免影响原对象
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const clonedObjects = [];
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for (const obj of visibleObjects) {
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const cloned = await this._cloneObject(obj);
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clonedObjects.push(cloned);
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}
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// 创建组
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tempGroup = new fabric.Group(clonedObjects, {
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selectable: false,
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evented: false,
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});
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// 添加组到画布
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this.canvas.add(tempGroup);
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}
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// 设置选区为裁剪路径
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const clipPath = await this._cloneObject(selectionObject);
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clipPath.set({
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fill: "",
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stroke: "",
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absolutePositioned: true,
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originX: "left",
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originY: "top",
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});
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// 应用裁剪路径到组
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tempGroup.set({
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clipPath: clipPath,
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});
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this.canvas.renderAll();
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// 计算渲染区域
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const renderBounds = {
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left: selectionBounds.left,
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top: selectionBounds.top,
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width: selectionBounds.width,
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height: selectionBounds.height,
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};
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// 设置高分辨率倍数，用于提高图像清晰度
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let highResolutionScale = 1;
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if (this.highResolutionEnabled) {
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// 结合设备像素比和配置的基础倍数，确保在所有设备上都有最佳效果
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const devicePixelRatio = window.devicePixelRatio || 1;
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// 使用更激进的缩放策略，确保高清晰度
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highResolutionScale = Math.max(
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this.baseResolutionScale,
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devicePixelRatio * 2
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);
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console.log(
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`设备像素比: ${devicePixelRatio}, 基础倍数: ${this.baseResolutionScale}, 最终放大倍数: ${highResolutionScale}`
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);
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} else {
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console.log("高分辨率渲染已禁用，使用1x倍数");
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}
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// 创建用于导出的高分辨率canvas
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const exportCanvas = document.createElement("canvas");
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const exportCtx = exportCanvas.getContext("2d", {
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alpha: true,
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willReadFrequently: false,
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colorSpace: "srgb",
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});
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// 设置canvas的实际像素尺寸（放大倍数）
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const actualWidth = Math.round(
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renderBounds.width * highResolutionScale
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);
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const actualHeight = Math.round(
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renderBounds.height * highResolutionScale
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);
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exportCanvas.width = actualWidth;
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exportCanvas.height = actualHeight;
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// 设置canvas的显示尺寸（CSS尺寸，保持与选区一致）
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exportCanvas.style.width = renderBounds.width + "px";
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exportCanvas.style.height = renderBounds.height + "px";
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// 启用最高质量渲染设置
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exportCtx.imageSmoothingEnabled = true;
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exportCtx.imageSmoothingQuality = "high";
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// 设置文本渲染质量
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if (exportCtx.textRenderingOptimization) {
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exportCtx.textRenderingOptimization = "optimizeQuality";
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}
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// 设置线条和图形的渲染质量
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exportCtx.lineCap = "round";
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exportCtx.lineJoin = "round";
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exportCtx.miterLimit = 10;
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// 设置画布背景为透明
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exportCtx.clearRect(0, 0, actualWidth, actualHeight);
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// 获取画布当前的变换矩阵
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const vpt = this.canvas.viewportTransform;
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const zoom = this.canvas.getZoom();
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// 保存当前变换状态
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exportCtx.save();
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// 应用高分辨率缩放
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exportCtx.scale(highResolutionScale, highResolutionScale);
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// 应用偏移，只渲染选区部分
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exportCtx.translate(-renderBounds.left, -renderBounds.top);
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// 如果画布有缩放和平移，需要应用相应变换
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if (zoom !== 1 || vpt[4] !== 0 || vpt[5] !== 0) {
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exportCtx.transform(vpt[0], vpt[1], vpt[2], vpt[3], vpt[4], vpt[5]);
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}
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// 渲染被裁剪的组
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tempGroup.render(exportCtx);
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exportCtx.restore();
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// 获取结果 - 使用最高质量设置
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const dataUrl = exportCanvas.toDataURL("image/png", 1.0);
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console.log(
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`抠图完成，选区尺寸: ${renderBounds.width}x${renderBounds.height}, 实际渲染尺寸: ${actualWidth}x${actualHeight}, 放大倍数: ${highResolutionScale}x`
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);
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return dataUrl;
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} finally {
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// 清理和恢复
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if (tempGroup) {
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// 移除裁剪路径
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tempGroup.set({ clipPath: null });
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// 如果是我们创建的临时组，需要移除它
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if (originalObjects.length > 0) {
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this.canvas.remove(tempGroup);
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// 恢复原始对象的状态（位置等信息保持不变）
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originalObjects.forEach(
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({
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object,
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originalLeft,
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originalTop,
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originalAngle,
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originalScaleX,
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originalScaleY,
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}) => {
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// 确保对象仍然在画布上且状态正确
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if (!this.canvas.getObjects().includes(object)) {
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this.canvas.add(object);
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}
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// 恢复原始变换状态（如果需要的话）
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object.set({
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left: originalLeft,
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top: originalTop,
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angle: originalAngle,
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scaleX: originalScaleX,
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scaleY: originalScaleY,
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});
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object.setCoords();
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}
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);
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}
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}
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// 恢复画布状态
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this.canvas.selection = originalSelection;
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if (originalActiveObject) {
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this.canvas.setActiveObject(originalActiveObject);
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}
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this.canvas.renderAll();
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}
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} catch (error) {
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console.error("在当前画布执行抠图失败:", error);
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return null;
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}
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}
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/**
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* 从DataURL创建fabric图像对象
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* @param {String} dataUrl 图像DataURL
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* @param {Object} selectionBounds 选区边界信息
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* @returns {fabric.Image} fabric图像对象
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* @private
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*/
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async _createFabricImage(dataUrl, selectionBounds) {
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return new Promise((resolve, reject) => {
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fabric.Image.fromURL(
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dataUrl,
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(img) => {
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if (!img) {
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reject(new Error("无法从DataURL创建图像"));
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return;
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}
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// 计算画布中心位置
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const canvasCenter = this.canvas.getCenter();
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// 如果有选区边界信息，使用选区的原始位置和尺寸
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let targetLeft = canvasCenter.left;
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let targetTop = canvasCenter.top;
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let targetWidth = img.width;
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let targetHeight = img.height;
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if (selectionBounds) {
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// 使用选区的原始位置
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targetLeft = selectionBounds.left + selectionBounds.width / 2;
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targetTop = selectionBounds.top + selectionBounds.height / 2;
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// 确保图像显示尺寸与选区尺寸一致
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targetWidth = selectionBounds.width;
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targetHeight = selectionBounds.height;
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console.log(
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`设置图像位置: left=${targetLeft}, top=${targetTop}, 尺寸: ${targetWidth}x${targetHeight}`
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);
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}
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// 计算缩放比例以匹配目标尺寸
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const scaleX = targetWidth / img.width;
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const scaleY = targetHeight / img.height;
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// 设置图像属性
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img.set({
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left: targetLeft,
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top: targetTop,
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scaleX: scaleX,
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scaleY: scaleY,
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originX: "center",
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originY: "center",
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selectable: true,
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evented: true,
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hasControls: true,
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hasBorders: true,
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cornerStyle: "circle",
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cornerColor: "#007aff",
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cornerSize: 10,
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transparentCorners: false,
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borderColor: "#007aff",
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borderScaleFactor: 2,
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// 优化图像渲染质量
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objectCaching: false, // 禁用缓存以确保最佳质量
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statefullCache: true,
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noScaleCache: false,
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});
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// 更新坐标
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img.setCoords();
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resolve(img);
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},
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{
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crossOrigin: "anonymous",
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// 确保图像以最高质量加载
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quality: 1.0,
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}
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);
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});
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}
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/**
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* 克隆fabric对象
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* @param {Object} obj fabric对象
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* @returns {Object} 克隆的对象
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* @private
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*/
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async _cloneObject(obj) {
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return new Promise((resolve, reject) => {
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if (!obj) {
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reject(new Error("对象无效，无法克隆"));
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return;
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}
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try {
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obj.clone((cloned) => {
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resolve(cloned);
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});
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} catch (error) {
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reject(error);
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}
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});
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}
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}
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