前言
代码流程汇总
流程
【第一张 logo 显示在 lk 启动流程中介绍】
【第二张 logo 初始化显示位置】：
Z:\work\E260L_CMCC_0919_eng\device\mediatek\mt6755\init.mt6755.rc
# Update the second boot logo
service bootlogoupdater /vendor/bin/boot_logo_updater
class core
oneshot
/////////////////////////////////////////////////////////////////////////////
// vendor\mediatek\proprietary\external\boot_logo_updater\boot_logo_updater.c
main(void)
// 获得启动模式，即启动的原因，并设置相应的属性节点值
int ret = update_boot_reason();
fd = open(BOOT_MODE_PATH, O_RDWR); // /sys/class/BOOT/BOOT/boot/boot_mode
s = read(fd, (void *)&boot_mode, sizeof(boot_mode));
property_get(BOOT_PACKAGE_SYS_PROPERTY, propVal, "0"); // sys.boot.reason"
property_set(BOOT_REASON_SYS_PROPERTY, propVal); // persist.sys.bootpackage
// 设置背光亮度
set_int_value(LCD_BACKLIGHT_PATH, 120); // /sys/class/leds/lcd-backlight/brightness
write_to_file(path, buf, strlen(buf));
int fd = open(path, O_RDWR);
int count = write(fd, buf, size);
close(fd);
// 都不在文件中了：查看 Android.mk
// LOCAL_C_INCLUDES += $(LOCAL_PATH)/../libshowlogo/
// 最终此文件中找到了对应的函数实现，代码路径为：
// vendor\mediatek\proprietary\external\libshowlogo
set_draw_mode(DRAW_ANIM_MODE_FB);
//Charging_animation.cpp
set_draw_mode(int draw_mode)
// 设置显示模式全局变量，有两种显示模式
// #define DRAW_ANIM_MODE_FB 1
// #define DRAW_ANIM_MODE_SURFACE 0
draw_anim_mode = draw_mode;
// 获得对应平台的 fstab 文件，获得 logo.img 挂载位置，然后读取 logo
// 然后初始化显示设备，有两种显示方式：
// 1. 直接在 fb 内核中显示
// 2. 在 surface 中显示
anim_init();
//Charging_animation.cpp
anim_init()
// 获得对应平台的 fstab 文件，然后获得其挂载分区 /logo
// 读取对应的 logo 镜像文件
anim_logo_init();
int ret = property_get("ro.hardware", propbuf, "");
snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf);
fstab = fs_mgr_read_fstab(fstab_filename);
rec = fs_mgr_get_entry_for_mount_point(fstab, LOGO_MNT_POINT);
fd = open(rec->blk_device, O_RDONLY);
logo_addr = (unsigned int*)malloc(LOGO_BUFFER_SIZE);
// (1) skip the image header
len = read(fd, logo_addr, 512);
// get the image
len = read(fd, logo_addr, LOGO_BUFFER_SIZE - 512);
close(fd);
// 1. 在 fb 中显示 logo
if (draw_anim_mode == (DRAW_ANIM_MODE_FB)) {
anim_fb_init();
// 打开 fb0,
fb_fd = open(FB_NODE_PATH, O_RDWR);
// 获得屏相关的信息参数
ioctl(fb_fd, FBIOGET_VSCREENINFO, &vinfo);
ioctl(fb_fd, FBIOGET_FSCREENINFO, &finfo);
// 将显示屏映射到进程的地址空间中
fb_size = finfo.line_length * vinfo.yres;
dec_logo_addr = (unsigned int*) malloc(fb_size);
lk_fb_addr =(unsigned int*)mmap(0, fb_size*3, PROT_READ | PROT_WRITE, MAP_SHARED, fb_fd, 0);
charging_fb_addr = (unsigned int*)((unsigned int)lk_fb_addr + fb_size);
kernel_fb_addr = (unsigned int*)((unsigned int)charging_fb_addr + fb_size);
fb_addr = lk_fb_addr;
// 设置本地的屏的相关参数
phical_screen.bits_per_pixel = vinfo.bits_per_pixel;
phical_screen.fill_dst_bits = vinfo.bits_per_pixel;
phical_screen.red_offset = vinfo.red.offset;
phical_screen.blue_offset = vinfo.blue.offset;
phical_screen.width = vinfo.xres;
phical_screen.height = vinfo.yres;
phical_screen.allignWidth = finfo.line_length/(vinfo.bits_per_pixel/8);
phical_screen.needAllign = 1;
phical_screen.need180Adjust = 1;
phical_screen.fb_size = fb_size;
// 设置旋转参数
if(0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "270", 3))
。。。
phical_screen.rotation = 270;
// 2. 在 surface 中显示 logo 初始化
} else {
anim_surface_init();
surfaceControl = client->createSurface(String8("charging-surface"), dinfo_width, dinfo_height, PIXEL_FORMAT_BGRA_8888);
SurfaceComposerClient::openGlobalTransaction();
surfaceControl->setLayer(2000000);
SurfaceComposerClient::closeGlobalTransaction();
// data structure to access surface content
surface = surfaceControl->getSurface();
phical_screen.width = dinfo.w;
phical_screen.height = dinfo.h;
// for we adjust the roration avove, so no need to consider rotation
phical_screen.rotation = 0;
phical_screen.need180Adjust = 0;
ANativeWindow* window = surface.get();
status_t result = native_window_api_connect(window, NATIVE_WINDOW_API_CPU);
err = window->dequeueBuffer(window, &buf, &fenceFd);
sp<Fence> mFence(new Fence(fenceFd));
mFence->wait(Fence::TIMEOUT_NEVER);
gb = new GraphicBuffer(buf, false);
phical_screen.needAllign = 1;
phical_screen.allignWidth = gb->getStride();
window->cancelBuffer(window, buf, fenceFd);
// use PIXEL_FORMAT_RGBA_8888 for surface flinger
phical_screen.bits_per_pixel = 32;
phical_screen.fill_dst_bits = 32;
fb_size = dinfo.w * dinfo.h* 4;
dec_logo_addr = malloc(fb_size);
phical_screen.fb_size = fb_size;
}
// 显示 logo, 其实就是
// 1. 从 logo.img 中读出对应的 logo
// 2. 将 logo 填充到显示缓冲区中即可
show_kernel_logo();
anim_show_logo(kernel_logo_position); // 此参数为 kernel logo 在 logo.img 中的 index ，static int kernel_logo_position = KERNEL_LOGO_INDEX ;
if (draw_anim_mode == (DRAW_ANIM_MODE_FB)) {
anim_set_buffer_address(index);
fill_animation_logo(index, fb_addr, dec_logo_addr, logo_addr,phical_screen); // 显示图片
anim_fb_disp_update();
} else {
ARect tmpRect;
tmpRect.left = 0;
tmpRect.top = 0;
tmpRect.right = phical_screen.width;
tmpRect.bottom = phical_screen.height;
status_t lockResult = surface->lock(&outBuffer, &tmpRect);
SLOGD("[libshowlogo: %s %d]outBuffer.bits = %d\n",__FUNCTION__,__LINE__, (int)outBuffer.bits);
SLOGD("[libshowlogo: %s %d]surface->lock return = 0x%08x, %d\n",__FUNCTION__,__LINE__,lockResult,lockResult);
if (0 == lockResult)
{
fill_animation_logo(index, (void *)outBuffer.bits, dec_logo_addr, logo_addr,phical_screen);// 显示图片
surface->unlockAndPost();
}
}
// 相关资源的释放
anim_deinit();
anim_logo_deinit();
free_fstab();
free(logo_addr);
logo_addr = NULL;
free(dec_logo_addr);
if (draw_anim_mode == (DRAW_ANIM_MODE_FB)) {
anim_fb_deinit();
munmap(lk_fb_addr, fb_size*3);
close(fb_fd);
} else {
anim_surface_deinit();
surface = surfaceControl->getSurface();
ANativeWindow* window = surface.get();
native_window_api_disconnect(window,NATIVE_WINDOW_API_CPU);
surfaceControl->clear();
client->dispose();
}