forked from backup/30dayMakeOS
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
int api_openwin(char *buf, int xsiz, int ysiz, int col_inv, char *title);
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void api_initmalloc(void);
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char *api_malloc(int size);
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void api_refreshwin(int win, int x0, int y0, int x1, int y1);
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void api_linewin(int win, int x0, int y0, int x1, int y1, int col);
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int api_getkey(int mode);
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void api_end(void);
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unsigned char rgb2pal(int r, int g, int b, int x, int y);
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void HariMain(void)
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{
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char *buf;
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int win, x, y;
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api_initmalloc();
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buf = api_malloc(144 * 164);
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win = api_openwin(buf, 144, 164, -1, "color2");
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for (y = 0; y < 128; y++) {
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for (x = 0; x < 128; x++) {
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buf[(x + 8) + (y + 28) * 144] = rgb2pal(x * 2, y * 2, 0, x, y);
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}
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}
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api_refreshwin(win, 8, 28, 136, 156);
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api_getkey(1); /*等待按下任意键*/
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api_end();
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}
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unsigned char rgb2pal(int r, int g, int b, int x, int y)
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{
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static int table[4] = { 3, 1, 0, 2 };
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int i;
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x &= 1; /*判断是偶数还是奇数*/
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y &= 1;
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i = table[x + y * 2]; /*用来生成中间色的常量*/
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r = (r * 21) / 256; /* r为0～20*/
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g = (g * 21) / 256;
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b = (b * 21) / 256;
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r = (r + i) / 4; /* r为0～5*/
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g = (g + i) / 4;
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b = (b + i) / 4;
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return 16 + r + g * 6 + b * 36;
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}
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