//在打印函数中，字符串常量定义为（强制类型转换）无符号常字符指针似乎是必须的
//但不知道原理为何！
//在变量转化为字符串的函数中，如果/为奇数个就很可能会出现显示乱码的问题。
//看来是个棘手的问题，还是等到将来再解决吧！
//drawfont()如果在指定了行号的情况下，是否能够对全部的东西正常显示，我还
//是没有把握，不过基本正常了，倒是这个程序调试了很长时间。
extern "C" {
typedef unsigned int _u_i;
struct Draw{
static char buf[0x1000];
static void fillbox(_u_i* fb, _u_i xsize, int color,
int x0, int y0, int x1, int y1);
static void drawfontline(int color, int x, int y,
const unsigned char *str);
static void drawfont(int color, int x, int y,
const unsigned char *str);
static void myprintf(char* buf, const char* s, ...);
// private:
static void makeascii(_u_i* fb, _u_i xsize, int color,
int x, int y, char *font);
static void makegb2312(_u_i* fb, _u_i xsize, int color,
int x, int y, short *font);
static int mydiv(int* n,unsigned int b);
static void myitoa(char* buf, int n, unsigned int b);
static int mystrlen(const unsigned char* s);
static void mystrcpy(char* d, const unsigned char* s, int n);
static int ascnum(const unsigned char* s);
static int sign;
static char mybuf[0x1000];
static const unsigned int MaxLines;
static unsigned int Lines;
};
int mymain(int eax, int ebx);
}
char Draw::buf[] = {0,};
int Draw::sign = 0;
char Draw::mybuf[] = {0,};
const unsigned int MaxLines = 48;
unsigned int Lines = 0;
void Draw::fillbox(_u_i* fb, _u_i xsize, int color,
int x0, int y0, int x1, int y1) {
int x, y;
for (y = 0; y <= y1 - y0; y++) {
for (x = 0; x <= x1 - x0; x++) {
fb[x0 + x + (y0 + y) * xsize] = color;
}
}
}
void Draw::makeascii (_u_i* fb, _u_i xsize, int color,
int x, int y, char *font) {
char d;
_u_i* p;
int i;
for (i = 0; i < 16; i++){
p = (_u_i*)fb + (y + i) * xsize + x;
d = font[i];
if ((d & 0x80) != 0) {p[0] = color;}
if ((d & 0x40) != 0) {p[1] = color;}
if ((d & 0x20) != 0) {p[2] = color;}
if ((d & 0x10) != 0) {p[3] = color;}
if ((d & 0x08) != 0) {p[4] = color;}
if ((d & 0x04) != 0) {p[5] = color;}
if ((d & 0x02) != 0) {p[6] = color;}
if ((d & 0x01) != 0) {p[7] = color;}
}
}
void Draw::makegb2312 (_u_i* fb, _u_i xsize, int color,
int x, int y, short *font) {
short d;
_u_i* p;
int i;
for (i = 0; i < 16; i++){
p = (_u_i*)fb + (y + i) * xsize + x;
d = font[i];
if ((d & 0x80) != 0) {p[0] = color;}
if ((d & 0x40) != 0) {p[1] = color;}
if ((d & 0x20) != 0) {p[2] = color;}
if ((d & 0x10) != 0) {p[3] = color;}
if ((d & 0x08) != 0) {p[4] = color;}
if ((d & 0x04) != 0) {p[5] = color;}
if ((d & 0x02) != 0) {p[6] = color;}
if ((d & 0x01) != 0) {p[7] = color;}
if ((d & 0x8000) != 0) {p[8] = color;}
if ((d & 0x4000) != 0) {p[9] = color;}
if ((d & 0x2000) != 0) {p[10] = color;}
if ((d & 0x1000) != 0) {p[11] = color;}
if ((d & 0x800) != 0) {p[12] = color;}
if ((d & 0x400) != 0) {p[13] = color;}
if ((d & 0x200) != 0) {p[14] = color;}
if ((d & 0x100) != 0) {p[15] = color;}
}
}
void Draw::drawfontline(int color, int x, int y, const unsigned char *str) {
extern short font[0x8000];
extern char myfont[0x1000];
int i = 0, j = 0;
unsigned char a, b;
unsigned int offset;
while (str[i] != 0) {
if (str[i] < 0x80) {
a = str[i];
Draw::makeascii((_u_i*)0xe0000000, 1024, color, x + j, y, myfont + a * 16);
if (str[i + 1] == 0)
break;
i++;
j += 8;
} else {
a = str[i] - 0xa0;
b = str[i + 1] - 0xa0;
offset = ((a - 1) * 94 + (b - 1)) * 16;
Draw::makegb2312((_u_i*)0xe0000000, 1024, color, x + j , y, font + offset);
i += 2;
j += 16;
}
}
}
void Draw::drawfont(int color, int x, int y, const unsigned char *str){
char tmp[130];
const unsigned char* tmp0;
int i = 0;
while(1){
tmp0 = str;
mystrcpy(tmp, tmp0, 126);
if(mystrlen((const unsigned char*)tmp) < 126){
drawfontline(0x0, x, y + i, (const unsigned char*)tmp);
break;
}
str += 126;
*(tmp + 126) = '\0';
if(!((*str - 1) < 0x80 || *str < 0x80)){
if(ascnum((const unsigned char*)tmp) % 2 != 0){
str--;
*(tmp + 125) = '\0';
}
}
drawfontline(0x0, x, y + i, (const unsigned char*)tmp);
i += 16;
}
}
int Draw::mystrlen(const unsigned char* s){
int len = 0;
while(*s++){
len++;
}
return len;
}
int Draw::ascnum(const unsigned char* s){
int num = 0;
while(*s){
if(*s++ < 0x80)
num++;
}
return num;
}
void Draw::mystrcpy(char* d, const unsigned char* s, int n){
for(int i = 0; i < n; i++){
*d++ = *s++;
}
}
int Draw::mydiv(int* n, unsigned int b){
int res;
res = *n % b;
*n /= b;
return res;
}
void Draw::myitoa(char* buf, int n, unsigned int b){
char s[] = "0123456789abcdef";
char tmpbuf[0xff];
char* tmp = tmpbuf;
if(n < 0){
sign = -1;
n = -n;
}
while(n){
*tmp++ = s[Draw::mydiv(&n, b)];
}
*tmp = '\0';
for(int i = mystrlen((const unsigned char*)tmpbuf) - 1; i >= 0 ; i--) {
*buf++ = tmpbuf[i];
}
*buf = '\0';
}
void Draw::myprintf(char* buf, const char* s, ...){
void** varg = (void**)&s;
varg++;
char* tmp;
int n;
while(*s){
if('%' != *s){
if('\\' != *s){
*buf++ = *s++;
} else{
s++;
switch(*s){
case '\\':
*buf++ = '\\';
break;
case 'n':
case 't':
case 'b':
s++;
break;
}
}
} else {
s++;
switch(*s){
case '%':
s++;
*buf++ = '%';
break;
case 's':
s++;
tmp = (char*)*varg++;
while(*tmp){
*buf++ = *tmp++;
}
break;
case 'c':
s++;
tmp = (char*)varg++;
*buf++ = *tmp;
break;
case 'd':
case 'i':
s++;
n = (int)*varg++;
myitoa(Draw::mybuf, n, 10);
tmp = Draw::mybuf;
if(-1 == sign)
*buf++ = '-';
while(*tmp){
*buf++ = *tmp++;
}
break;
case 'x':
case 'X':
s++;
n = (int)*varg++;
myitoa(Draw::mybuf, n, 16);
tmp = Draw::mybuf;
*buf++ = '0';
*buf++ = 'x';
while(*tmp){
*buf++ = *tmp++;
}
break;
case 'b':
case 'B':
s++;
n = (int)*varg++;
myitoa(Draw::mybuf, n, 2);
tmp = Draw::mybuf;
while(*tmp){
*buf++ = *tmp++;
}
*buf++ = 'b';
break;
default:
break;
}
}
}
*buf = '\0';
return;
}
int mymain(int eax, int ebx) {
Draw::fillbox((_u_i*)0xe0000000, 1024, 0x1e90ff, 0, 0, 1024 - 1, 768 - 1);
// Draw::drawfontline(0xffffffff, 0, 0, (const unsigned char*)"我爱你！SnailOS!");
// Draw::drawfontline(0x00ff0000, 160, 319, (const unsigned char*)"庆幸的是我们的开发环境很好,能够让我们即是看到效果，开心^_^");
// int i = 253;
char str[] = "Welcome to SnailOS! 测试变量。";
char str0[] = "这 一 次 需要 测试一下如果一行文本超过了行的长度，我们的显示程序会是什么样的\\\\情况，这样我们就能在全屏幕上上显示我们想要的";
char str1[] = "1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567";
// Draw::drawfontline(0x0000ff00, 0, 15, (const unsigned char*)Draw::buf);
// Draw::myprintf(Draw::buf, "%s", str1);
// Draw::drawfontline(0x00000000, 0, 31, (const unsigned char*)Draw::buf);
// Draw::myprintf(Draw::buf, "%d\\n", 1024 / 16);
// Draw::drawfontline(0x00000000, 0, 47, (const unsigned char*)Draw::buf);
// Draw::myprintf(Draw::buf, "%d\\n", 13 * 10 - 2);
// Draw::drawfontline(0x00000000, 0, 59, (const unsigned char*)Draw::buf);
Draw::myprintf(Draw::buf, "二进制数：%b%s %s%d %s%s%%%s",0xff, str, str0, 0x32, str0, str1, str0);
Draw::drawfont(0x00000000, 0, 0, (const unsigned char*)Draw::buf);
while(1) {
asm("hlt"::);
}
}