Function addScreenShot

apps/screenshot/content-script.js:156–212

* 添加截图到canvas * @param {Object} data - 截图数据 * @param {string} uri - 图片URI

(data, uri)

     * @param {string} uri - 图片URI
     */
    function addScreenShot(data, uri) {
        // 如果已取消截图，不处理
        if (isCancelled) return;
        
        const image = new Image();
        
        // 图片加载错误处理
        image.onerror = function() {
            captureConfig.fail('图片加载失败');
            releaseResources();
        };

        image.onload = function() {
            try {
                data.image = {width: image.width, height: image.height};

                // 调整缩放比例
                if (data.windowWidth !== image.width) {
                    const scale = image.width / data.windowWidth;
                    data.x *= scale;
                    data.y *= scale;
                    data.totalWidth *= scale;
                    data.totalHeight *= scale;
                }

                // 如果是第一张截图，初始化canvas
                if (!screenshots.length) {
                    screenshots = _initScreenshots(data.totalWidth, data.totalHeight);
                }

                // 获取与当前区域重叠的canvas并绘制图像
                const matchingScreenshots = _filterScreenshots(
                    data.x, data.y, image.width, image.height, screenshots
                );
                
                matchingScreenshots.forEach(screenshot => {
                    screenshot.ctx.drawImage(
                        image,
                        data.x - screenshot.left,
                        data.y - screenshot.top
                    );
                });

                // 如果是最后一步，调用成功回调
                if (data.complete === 1) {
                    captureConfig.success(data);
                    isCapturing = false;
                }
            } catch (e) {
                captureConfig.fail('处理截图时出错: ' + e.message);
                releaseResources();
            }
        };
        
        // 设置图片源
        image.src = uri;
    }