37 lines
1.5 KiB
C
37 lines
1.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ML_bmp_and.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_bmp_and(const unsigned char *bmp, int x, int y, int width, int height)
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{
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unsigned short line;
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char shift, *screen, *p=(char*)&line;
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int i, j, begin=0, end=height, real_width=(width-1>>3<<3)+8;
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if(!bmp || x<0 || x>128-width || y<1-height || y>63 || width<1 || height<1) return;
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if(y < 0) begin = -y;
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if(y+height > 64) end = 64-y;
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shift = 8-(x&7);
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screen = ML_vram_adress()+(y+begin<<4)+(x>>3);
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for(i=begin ; i<end ; i++)
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{
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for(j=0 ; j<width-1>>3 ; j++)
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{
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line = ~((unsigned char)~bmp[i*(real_width>>3)+j]<<shift);
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screen[j] &= *p;
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if(shift!=8) screen[j+1] &= *(p+1);
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}
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line = ~((unsigned char)~(bmp[i*(real_width>>3)+j] | (unsigned char)-1>>8-(width&7))<<shift);
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screen[j] &= *p;
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if(shift!=8 && x+real_width<129) screen[j+1] &= *(p+1);
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screen += 16;
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}
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}
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