60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ML_vertical_line.c */
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/* | Project : libmonochrome */
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/* */
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/* By: Pierre "PierrotLL" Le Gall <legallpierre89@gmail.com> */
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/* Last updated: 2011/11/22 */
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/* */
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/* ************************************************************************** */
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#include <monochrome/internals.h>
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void ML_vertical_line(int x, int y1, int y2, ML_Color color)
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{
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int i, j;
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char checker, byte, *vram = ML_vram_address();
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if(x&~127 || (y1<0 && y2<0) || (y1>63 && y2>63)) return;
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if(y1 > y2)
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{
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int tmp = y1;
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y1 = y2;
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y2 = tmp;
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}
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if(y1 < 0) y1 = 0;
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if(y2 > 63) y2 = 63;
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i = (y1<<4)+(x>>3);
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j = (y2<<4)+(x>>3);
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switch (color)
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{
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case ML_BLACK:
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byte = 128>>(x&7);
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for( ; i<=j ; i+=16)
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vram[i] |= byte;
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break;
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case ML_WHITE:
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byte = ~(128>>(x&7));
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for( ; i<=j ; i+=16)
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vram[i] &= byte;
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break;
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case ML_XOR:
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byte = 128>>(x&7);
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for( ; i<=j ; i+=16)
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vram[i] ^= byte;
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break;
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case ML_CHECKER:
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byte = 128>>(x&7);
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checker = (y1 & 1) ^ (x & 1);
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for( ; i<=j ; i+=16)
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{
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if(checker) vram[i] &= ~byte;
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else vram[i] |= byte;
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checker = !checker;
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}
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break;
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default:
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break;
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}
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}
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