关于图形模式的问题
本帖最后由 626788149 于 2015-10-30 13:09 编辑当屏幕满的时候 我需要向上滚动一行以显示新的内容
比如，我想打印10000行的信息，在qeum虚拟机下大概需要几秒钟的时间
但是在boch下或者在真实的机器下需要大概十分钟的时间才能全部打印完
如何才能加速呢？
void init_vbe(uint32_t *p){
//初始化VGA 获得一些VGA的信息
multiboot_info_t* minf = (multiboot_info_t*)p;
//find if there have info about vbe
//
if((minf == NULL) || (minf->flags & 0x800) != 0x800)
return;
VbeInfoBlock* vbeib = (VbeInfoBlock*)minf->vbe_info.vbe_control_info;
ModeInfoBlock* vebmb = (ModeInfoBlock*)minf->vbe_info.vbe_mode_info;
//D7 = Linear frame buffer mode is available
//0 = No
//1 = Yes
if((vebmb == NULL) || (vebmb->attributes & 0x80) != 0x80){
//Linear frame buffer mode is unavailable
return;
}
if((vebmb->attributes & 0x10) == 0x10){
//text mode
video.mode = 0;
}else{
video.mode = 1;
}
extern char _binary_font_bin_start[];
video.screen = (unsigned char*)vebmb->physbase;// Linear frame buffer 基地址
video.Xres = vebmb->Xres;
video.Yres = vebmb->Yres;
video.bpp = vebmb->bpp;
video.pitch = vebmb->pitch;
video.font_address = _binary_font_bin_start;
video.buff_size = video.Xres * video.Yres * (video.bpp/8);
video.crt_pos = 0;
video.fonth = 16; //font pixel height
video.fontw = 8;
video.xpos = video.ypos = 0;
if(video.mode)
video.numchars = video.Xres * video.Yres / video.fonth /video.fontw;
else
video.numchars = video.Xres * video.Yres;
video.nchars_colum = video.Xres / video.fontw;
video.nchars_line = video.Yres / video.fonth;
cprintf("video.bpp:%d\n",video.bpp);
cprintf("video.pitch:%d\n",video.pitch);
cprintf("vbeib->TotalMemory:%dMB\n",vbeib->TotalMemory*64/1024);
cprintf("vbeib.buff_size:%dkb\n",video.buff_size/1024);
cprintf("vbeib->screen:%x\n",video.screen);
}
void vga_putc(int c){
// if no attribute given, then use black on white
if (!(c & ~0xFF))
c |= 0xFFFFFF00;
switch (c & 0xff) {
case '\n':
video.ypos++;
/* fallthru */
case '\r':
video.xpos = 0;
break;
case '\t':
cons_putc(' ');
cons_putc(' ');
cons_putc(' ');
cons_putc(' ');
cons_putc(' ');
break;
default:
//x * video.fontw, y * video.fontw
draw_char((c & 0xFF),video.xpos * video.fontw, video.ypos * video.fonth ,(c>>8) & 0xFF, (c>>16) & 0xFF,(c>>24) & 0xFF);
video.xpos++;
break;
}
if (video.xpos >= video.nchars_colum ){
video.xpos = 0;
video.ypos++;
}
if(video.ypos >= video.nchars_line){
//这一步用于滚屏
//video.fonth is height of font
memmove(video.screen, video.screen + video.Xres * video.bpp/8 * video.fonth,
(video.buff_size - video.Xres * video.bpp/8* video.fonth));
video.ypos--;
int i;
for (i = 0; i < video.nchars_colum; i++){
draw_char(' ',(video.xpos + i) * video.fontw, video.ypos * video.fonth ,(c>>8) & 0xFF, (c>>16) & 0xFF,(c>>24) & 0xFF);
}
}
}
void draw_char(char ch, int x, int y,unsigned char r,unsigned char g,unsigned char b)
{
//这个函数用于画字符
int bar = video.bpp/8;
char* font = video.font_address + ch*16;
unsigned char *where = video.screen + x*bar + y*video.Xres*bar;
int i, j;
for (i = 0; i < 16; i++) {
uint8_t bit = 0x80;
for (j = 0; j < 8; j++) {
if(*font & bit){
where = b;
where = g;
where = r;
}
else{
where = 0x00;
where = 0x00;
where = 0x00;
}
bit = bit >> 1;
}
where+=video.bpp*video.Xres/8;
font ++;
}
}static void putpixel(unsigned char* screen, int x,int y, int color) {
//这个函数用于画点
int i = video.bpp/8;
unsigned where = x*i + y*i*video.Xres;
screen = color & 255; // BLUE
screen = (color >> 8) & 255; // GREEN
screen = (color >> 16) & 255;// RED
}刷新的速度很慢
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