生成画布图片失败！

• 当前 Bug 的表现（可附上截图）

• 预期表现

• 复现路径

• 提供一个最简复现 Demo

wx.canvasToTempFilePath({             x: 0,             y: 0,             width: 600,             height: 950,             destWidth: posterWidth * 4,             destHeight: posterHeight * 4,             canvasId: 'shareImgOne',             success: function (res) {               console.log(res.tempFilePath);               that.setData({                 shareImgSrc: res.tempFilePath               })               //wx.saveImageToPhotosAlbum将图片保存到本地  3               wx.saveImageToPhotosAlbum({                 filePath: that.data.shareImgSrc,                 success(res) {                   wx.hideLoading();                   wx.showModal({                     title: '存图成功',                     content: '图片成功保存到相册了，去发圈噻~',                     showCancel: false,                     confirmText: '好哒',                     confirmColor: '#72B9C3',                     success: function (res) {                       if (res.confirm) {                         that.setData({                           bigModel: false                         })                         console.log('用户点击确定');                       }                     }                   })                 }               })             },             fail: function (res) {               console.log(res);               that.setData({                 bigModel: false               })             }           });

总是提示canvasToTempFilePath:fail:create bitmap failed，搞不懂啥原因

posterWidth

posterHeight

这两个是屏幕的宽高