kernel logo到开机动画之间闪现黑屏

[DESCRIPTION]

现象:L版本开机时,kernel logo与开机动画之间闪一帧黑屏。

[SOLUTION]

1. 这个现象是因为,在BootAnimation开始绘图之前,会先做一次clear screen的动作,避免出现

前面的图干扰到BootAnimation的显示。这是Google default design,虽然不可避免,但是可以优

化。

优化方法:

通过check main_log先确认播放开机动画是哪个function,在对应function删除clear screen的动

作的对应代码。

/php?mod=tag&id=6090" target="_blank" class="relatedlink">Frameworks/base/cmds/bootanimation/BootAnimation.cpp

450bool BootAnimation::android()

451{

452 initTexture(&mAndroid[0], mAssets, "images/android-logo-mask.png");

453 initTexture(&mAndroid[1], mAssets, "images/android-logo-shine.png");

454

/*----------------------------删除clear screen对应code--------------------

-----*/

455 // clear screen

456 glShadeModel(GL_FLAT);

457 glDisable(GL_DITHER);

458 glDisable(GL_SCISSOR_TEST);

459 glClearColor(0,0,0,1);

460 glClear(GL_COLOR_BUFFER_BIT);

461 eglSwapBuffers(mDisplay, mSurface);

/*----------------------------删除clear screen对应code--------------------

-----*/

462

463 glEnable(GL_TEXTURE_2D);

464 gLTExEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

594bool BootAnimation::movie()

/*----------------------------删除clear screen对应code--------------------

-----*/

700 // clear screen

701 glShadeModel(GL_FLAT);

702 glDisable(GL_DITHER);

703 glDisable(GL_SCISSOR_TEST);

704 glDisable(GL_BLEND);

705 glClearColor(0,0,0,1);

706 glClear(GL_COLOR_BUFFER_BIT);

707

708 eglSwapBuffers(mDisplay, mSurface);

709

/*----------------------------删除clear screen对应code--------------------

-----*/

1128bool BootAnimation::mtkmovie()

/*----------------------------删除clear screen对应code--------------------

-----*/

1222 // clear screen

1223 glDisable(GL_DITHER);

1224 glDisable(GL_SCISSOR_TEST);

1225 glDisable(GL_BLEND);

1226 glClear(GL_COLOR_BUFFER_BIT);

1227

1228 eglSwapBuffers(mDisplay, mSurface);

/*----------------------------删除clear screen对应code--------------------

-----*/

2.还有,在initAudioPath() function中,两个while循环可能耗时导致黑屏。

820char* BootAnimation::initAudioPath() {

835 while (strcmp(type, "-1") == 0 &&

836 strcmp(crypto_state, "unencrypted") != 0 &&

837 deal_with_encryption == true){

838 usleep(100000);

839 property_get("ro.crypto.state", crypto_state, "-1");

840 property_get("vold.encryption.type", type, "-1");

841 }

842

843 while (strcmp(type, "default") == 0 && deal_with_encryption == true){

844 property_get("vold.decrypt", status, "-1");

845 if (strcmp(status, "trigger_restart_framework") != 0){

846 usleep(100000);

847 XLOGD("[BootAnimation %s %d]Decrypt

status=%s",__FUNCTION__,__LINE__,status);

848 continue;

849 }

850 property_get("persist.sys.mute.state", volume, "-1");

851 int nVolume = -1;

852 nVolume = atoi(volume);

853 XLOGD("[BootAnimation %s

%d]nVolume=%d",__FUNCTION__,__LINE__,nVolume);

854 if(nVolume == 0 || nVolume == 1){

855 XLOGD("initAudioPath: DON'T PLAY AUDIO!");

856 return NULL;

857 }

858 break;

859 }

来源:一牛网论坛

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