我已经实现了一些屏幕截图代码,可以在这里查看
我正在使用本文中的 GetTimeInNanoseconds
该函数每 100 毫秒调用一次。我已经计时了执行部分功能需要多少毫秒,即:
screenShotStart = GetTimeInNanoseconds();
CGImageRef image = CGWindowListCreateImage(rect, kCGWindowListOptionIncludingWindow|kCGWindowListOptionOnScreenBelowWindow, 0, kCGWindowImageDefault);
CGImageRelease(image);
screenShotStop = GetTimeInNanoseconds();
screenShotElapsed = screenShotStop - screenShotStart;
/* Current Delta Time */
screenShotElapsedF = ((float) screenShotElapsed)/1000000.0f;
/* Smooth Delta Time */
screenShotTime = 0.9f*screenShotTime + 0.1f*screenShotElapsedF;
下面的时间测量显示了结果。我很惊讶它有多慢,我想知道为什么。有经验丰富的 Cocoa/Core Graphics OSX 开发人员可以向我解释吗?并可能告诉我应该如何修复它?
Smooth :以毫秒为单位的平均增量时间。当前:最新、最新的增量时间(以毫秒为单位)。
Screenshot profile : 0.242122ms (smooth) | 2.421224ms (current)
Screenshot profile : 0.970972ms (smooth) | 7.530621ms (current)
Screenshot profile : 1.421471ms (smooth) | 5.475956ms (current)
Screenshot profile : 2.172416ms (smooth) | 8.930922ms (current)
Screenshot profile : 2.840984ms (smooth) | 8.858095ms (current)
Screenshot profile : 3.633541ms (smooth) | 10.766552ms (current)
Screenshot profile : 4.383532ms (smooth) | 11.133454ms (current)
Screenshot profile : 4.876161ms (smooth) | 9.309816ms (current)
Screenshot profile : 5.043479ms (smooth) | 6.549345ms (current)
Screenshot profile : 5.465037ms (smooth) | 9.259055ms (current)
Screenshot profile : 5.709429ms (smooth) | 7.908960ms (current)
Screenshot profile : 5.971393ms (smooth) | 8.329066ms (current)
Screenshot profile : 6.127830ms (smooth) | 7.535762ms (current)
Screenshot profile : 6.533566ms (smooth) | 10.185198ms (current)
Screenshot profile : 6.661420ms (smooth) | 7.812104ms (current)
Screenshot profile : 6.648901ms (smooth) | 6.536235ms (current)
Screenshot profile : 6.564128ms (smooth) | 5.801169ms (current)
Screenshot profile : 6.946393ms (smooth) | 10.386786ms (current)
Screenshot profile : 7.231448ms (smooth) | 9.796943ms (current)
Screenshot profile : 7.408576ms (smooth) | 9.002735ms (current)
Screenshot profile : 7.901027ms (smooth) | 12.333084ms (current)
Screenshot profile : 7.832513ms (smooth) | 7.215887ms (current)
Screenshot profile : 8.077989ms (smooth) | 10.287273ms (current)
Screenshot profile : 8.032367ms (smooth) | 7.621767ms (current)
Screenshot profile : 8.203003ms (smooth) | 9.738728ms (current)
Screenshot profile : 8.525432ms (smooth) | 11.427292ms (current)
Screenshot profile : 8.672282ms (smooth) | 9.993936ms (current)
Screenshot profile : 8.818027ms (smooth) | 10.129727ms (current)
Screenshot profile : 8.968993ms (smooth) | 10.327700ms (current)
Screenshot profile : 9.755873ms (smooth) | 16.837791ms (current)
Screenshot profile : 10.098254ms (smooth) | 13.179691ms (current)
Screenshot profile : 10.007771ms (smooth) | 9.193431ms (current)
Screenshot profile : 9.730317ms (smooth) | 7.233225ms (current)
Screenshot profile : 9.923961ms (smooth) | 11.666759ms (current)
Screenshot profile : 10.171064ms (smooth) | 12.395005ms (current)
Screenshot profile : 10.436771ms (smooth) | 12.828136ms (current)
Screenshot profile : 10.752213ms (smooth) | 13.591184ms (current)
Screenshot profile : 10.677605ms (smooth) | 10.006127ms (current)
Screenshot profile : 10.696332ms (smooth) | 10.864876ms (current)
Screenshot profile : 10.836714ms (smooth) | 12.100148ms (current)
Screenshot profile : 10.384002ms (smooth) | 6.309598ms (current)
Screenshot profile : 10.512785ms (smooth) | 11.671834ms (current)
Screenshot profile : 10.594671ms (smooth) | 11.331652ms (current)
Screenshot profile : 11.022106ms (smooth) | 14.869019ms (current)
Screenshot profile : 11.056261ms (smooth) | 11.363660ms (current)
Screenshot profile : 13.173499ms (smooth) | 32.228638ms (current)
Screenshot profile : 12.901811ms (smooth) | 10.456617ms (current)
Screenshot profile : 12.511471ms (smooth) | 8.998418ms (current)
Screenshot profile : 60.684856ms (smooth) | 494.245331ms (current)
Screenshot profile : 111.287766ms (smooth) | 566.713928ms (current)
Screenshot profile : 118.577721ms (smooth) | 184.187302ms (current)
Screenshot profile : 126.834038ms (smooth) | 201.140869ms (current)
Screenshot profile : 233.015961ms (smooth) | 1188.653198ms (current)
Screenshot profile : 293.934875ms (smooth) | 842.205017ms (current)
Screenshot profile : 282.354095ms (smooth) | 178.127045ms (current)
Screenshot profile : 297.604187ms (smooth) | 434.854919ms (current)
Screenshot profile : 300.026642ms (smooth) | 321.828796ms (current)
Screenshot profile : 298.798157ms (smooth) | 287.741913ms (current)
Screenshot profile : 307.527008ms (smooth) | 386.086761ms (current)
Screenshot profile : 294.194061ms (smooth) | 174.197708ms (current)
Screenshot profile : 286.482117ms (smooth) | 217.074570ms (current)
Screenshot profile : 277.750549ms (smooth) | 199.166428ms (current)
Screenshot profile : 271.708069ms (smooth) | 217.325623ms (current)
Screenshot profile : 245.042664ms (smooth) | 5.053972ms (current)
Screenshot profile : 221.163406ms (smooth) | 6.250124ms (current)
Screenshot profile : 208.384155ms (smooth) | 93.371033ms (current)
Screenshot profile : 207.589813ms (smooth) | 200.440811ms (current)
Screenshot profile : 223.785492ms (smooth) | 369.546631ms (current)
Screenshot profile : 221.480774ms (smooth) | 200.738419ms (current)
Screenshot profile : 230.090012ms (smooth) | 307.573181ms (current)
Screenshot profile : 254.507935ms (smooth) | 474.269287ms (current)
Screenshot profile : 283.468353ms (smooth) | 544.112122ms (current)
Screenshot profile : 285.878754ms (smooth) | 307.572601ms (current)
Screenshot profile : 300.691986ms (smooth) | 434.011261ms (current)
Screenshot profile : 301.684082ms (smooth) | 310.613220ms (current)
Screenshot profile : 272.227661ms (smooth) | 7.119990ms (current)
Screenshot profile : 246.098129ms (smooth) | 10.932533ms (current)
Screenshot profile : 281.438873ms (smooth) | 599.505737ms (current)
Screenshot profile : 291.068756ms (smooth) | 377.737671ms (current)
Screenshot profile : 262.161163ms (smooth) | 1.992869ms (current)
Screenshot profile : 236.614410ms (smooth) | 6.693653ms (current)
Screenshot profile : 243.460983ms (smooth) | 305.080231ms (current)
Screenshot profile : 240.609909ms (smooth) | 214.950256ms (current)
Screenshot profile : 266.002258ms (smooth) | 494.533417ms (current)
Screenshot profile : 276.689453ms (smooth) | 372.874268ms (current)
Screenshot profile : 278.445312ms (smooth) | 294.248047ms (current)
Screenshot profile : 268.703094ms (smooth) | 181.023148ms (current)
Screenshot profile : 242.027161ms (smooth) | 1.943824ms (current)
Screenshot profile : 218.654465ms (smooth) | 8.300381ms (current)
Screenshot profile : 211.597733ms (smooth) | 148.087173ms (current)
Screenshot profile : 191.547241ms (smooth) | 11.092879ms (current)
Screenshot profile : 181.838150ms (smooth) | 94.456367ms (current)
Screenshot profile : 164.788208ms (smooth) | 11.338873ms (current)
Screenshot profile : 151.486023ms (smooth) | 31.766415ms (current)
Screenshot profile : 159.313858ms (smooth) | 229.764404ms (current)
Screenshot profile : 220.536041ms (smooth) | 771.535706ms (current)
Screenshot profile : 198.653290ms (smooth) | 1.708489ms (current)
Screenshot profile : 180.131805ms (smooth) | 13.438550ms (current)
Screenshot profile : 307.717621ms (smooth) | 1455.989990ms (current)
Screenshot profile : 477.049713ms (smooth) | 2001.038452ms (current)
Screenshot profile : 434.271057ms (smooth) | 49.263458ms (current)
Screenshot profile : 392.732391ms (smooth) | 18.884504ms (current)
Screenshot profile : 396.588654ms (smooth) | 431.295227ms (current)
Screenshot profile : 410.529907ms (smooth) | 536.001404ms (current)
Screenshot profile : 420.648346ms (smooth) | 511.714478ms (current)
Screenshot profile : 421.814819ms (smooth) | 432.313385ms (current)
Screenshot profile : 398.381866ms (smooth) | 187.485214ms (current)
Screenshot profile : 359.150482ms (smooth) | 6.068115ms (current)
Screenshot profile : 395.477631ms (smooth) | 722.422058ms (current)
Screenshot profile : 356.116364ms (smooth) | 1.864945ms (current)
Screenshot profile : 321.195648ms (smooth) | 6.909203ms (current)
Screenshot profile : 313.617981ms (smooth) | 245.419037ms (current)
Screenshot profile : 291.778534ms (smooth) | 95.223839ms (current)
Screenshot profile : 275.232025ms (smooth) | 126.313583ms (current)
Screenshot profile : 299.395660ms (smooth) | 516.868530ms (current)
Screenshot profile : 289.037140ms (smooth) | 195.810669ms (current)
Screenshot profile : 472.922241ms (smooth) | 2127.887939ms (current)
Screenshot profile : 425.895874ms (smooth) | 2.658584ms (current)
Screenshot profile : 404.271606ms (smooth) | 209.653427ms (current)
编辑:下载配置文件结果