| intmapFrameBufferLocked(structprivate_module_t*module)
{
// already initialized...
if(module->framebuffer){
return0;
}
charconst*constdevice_template[]={
"/dev/graphics/fb%u",
"/dev/fb%u",
0};
intfd=-1;
inti=0;
charname[64];
while((fd==-1)&&device_template[i]){
snprintf(name,64,device_template[i],0);
fd=open(name,O_RDWR,0);
i++;
}
if(fd<0)
return-errno;
structfb_fix_screeninfo finfo;
if(ioctl(fd,FBIOGET_FSCREENINFO,&finfo)==-1)
return-errno;
structfb_var_screeninfo info;
if(ioctl(fd,FBIOGET_VSCREENINFO,&info)==-1)
return-errno;
info.reserved[0]=0;
info.reserved[1]=0;
info.reserved[2]=0;
info.xoffset=0;
info.yoffset=0;
info.activate=FB_ACTIVATE_NOW;
/*
* Explicitly request 5/6/5
*/
info.bits_per_pixel=16;
info.red.offset=11;
info.red.length=5;
info.green.offset=5;
info.green.length=6;
info.blue.offset=0;
info.blue.length=5;
info.transp.offset=0;
info.transp.length=0;
/*
* Request NUM_BUFFERS screens (at lest 2 for page flipping)
*/
info.yres_virtual=info.yres*NUM_BUFFERS;
uint32_tflags=PAGE_FLIP;
if(ioctl(fd,FBIOPUT_VSCREENINFO,&info)==-1){
info.yres_virtual=info.yres;
flags&=~PAGE_FLIP;
LOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
}
if(info.yres_virtual<info.yres*2){
// we need at least 2 for page-flipping
info.yres_virtual=info.yres;
flags&=~PAGE_FLIP;
LOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
info.yres_virtual,info.yres*2);
}
if(ioctl(fd,FBIOGET_VSCREENINFO,&info)==-1)
return-errno;
intrefreshRate=1000000000000000LLU/
(
uint64_t(info.upper_margin+info.lower_margin+info.yres)
*(info.left_margin+info.right_margin+info.xres)
*info.pixclock
);
if(refreshRate==0){
// bleagh, bad info from the driver
refreshRate=60*1000;// 60 Hz
}
if(int(info.width)<=0||int(info.height)<=0){
// the driver doesn't return that information
// default to 160 dpi
info.width=((info.xres*25.4f)/160.0f+0.5f);
info.height=((info.yres*25.4f)/160.0f+0.5f);
}
floatxdpi=(info.xres*25.4f)/info.width;
floatydpi=(info.yres*25.4f)/info.height;
floatfps=refreshRate/1000.0f;
LOGI("using (fd=%d)\n"
"id = %s\n"
"xres = %d px\n"
"yres = %d px\n"
"xres_virtual = %d px\n"
"yres_virtual = %d px\n"
"bpp = %d\n"
"r = %2u:%u\n"
"g = %2u:%u\n"
"b = %2u:%u\n",
fd,
finfo.id,
info.xres,
info.yres,
info.xres_virtual,
info.yres_virtual,
info.bits_per_pixel,
info.red.offset,info.red.length,
info.green.offset,info.green.length,
info.blue.offset,info.blue.length
);
LOGI("width = %d mm (%f dpi)\n"
"height = %d mm (%f dpi)\n"
"refresh rate = %.2f Hz\n",
info.width,xdpi,
info.height,ydpi,
fps
);
if(ioctl(fd,FBIOGET_FSCREENINFO,&finfo)==-1)
return-errno;
if(finfo.smem_len<=0)
return-errno;
module->flags=flags;
module->info=info;
module->finfo=finfo;
module->xdpi=xdpi;
module->ydpi=ydpi;
module->fps=fps;
/*
* map the framebuffer
*/
interr;
size_tfbSize=roundUpToPageSize(finfo.line_length*info.yres_virtual);//对齐页
module->framebuffer=newprivate_handle_t(dup(fd),fbSize,0);
module->numBuffers=info.yres_virtual/info.yres;
module->bufferMask=0;
void*vaddr=mmap(0,fbSize,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
if(vaddr==MAP_FAILED){
LOGE("Error mapping the framebuffer (%s)",strerror(errno));
return-errno;
}
module->framebuffer->base=intptr_t(vaddr);
memset(vaddr,0,fbSize);
return0;
} |
