The result is always fault, even we tried 5 times

[liangyuhong160]

手机型号：redmi note 10 pro
当画图尺寸设置喂某些值的时候会出现这个问题，比图width: 392, height: 66
发现手机dpr是2.75
生成图的时候：
wx.canvasToTempFilePath({ canvasId: 'photo', canvas: that.properties.use2D ? that.canvasNode : null, destWidth: that.canvasWidthInPx * getApp().systemInfo.pixelRatio, destHeight: that.canvasHeightInPx * getApp().systemInfo.pixelRatio, success: function (res) { that.getImageInfo(res.tempFilePath); }, fail: function (error) { console.error(canvasToTempFilePath failed, ${JSON.stringify(error)}); that.triggerEvent('imgErr', { error: error }); }, }, this);
destWidth：是1078，destHeight：是181.5
wx.getImageInfo({ src: filePath, success: (infoRes) => { if (that.paintCount > MAX_PAINT_COUNT) { const error =The result is always fault, even we tried ${MAX_PAINT_COUNT} times; console.error(error); that.triggerEvent('imgErr', { error: error }); return; } // 比例相符时才证明绘制成功，否则进行强制重绘制 if (Math.abs((infoRes.width * that.canvasHeightInPx - that.canvasWidthInPx * infoRes.height) / (infoRes.height * that.canvasHeightInPx)) < 0.01) { that.triggerEvent('imgOK', { path: filePath }); } else { console.log('比例不同，重新绘制') that.startPaint(); } that.paintCount++; }, fail: (error) => { console.error(getImageInfo failed, ${JSON.stringify(error)}); that.triggerEvent('imgErr', { error: error }); }, });
wx.getImageInfo出来的图会精度丢失， infoRes.height是181，
Math.abs((infoRes.width * that.canvasHeightInPx - that.canvasWidthInPx * infoRes.height) / (infoRes.height * that.canvasHeightInPx))
这个算出来偏差有0.016几，就会继续重绘