59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/* ************************************************************************** */
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/* */
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/* ML_bmp_or_cl.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_or_cl(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;
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int i, j, real_width, begin_x, end_x, begin_y, end_y;
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char bool1=1, bool2=1, bool3;
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if(!bmp || x<1-width || x>127 || y<1-height || y>63 || height<1 || width<1) return;
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p = (char*)&line;
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real_width = (width-1>>3<<3)+8;
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if(y < 0) begin_y = -y;
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else begin_y = 0;
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if(y+height > 64) end_y = 64-y;
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else end_y = height;
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shift = 8-(x&7);
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if(x<0)
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{
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begin_x = -x>>3;
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if(shift != 8) bool1 = 0;
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} else begin_x = 0;
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if(x+real_width > 128) end_x = 15-(x>>3), bool2 = 0;
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else end_x = real_width-1>>3;
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bool3 = (end_x == real_width-1>>3);
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screen = ML_vram_adress()+(y+begin_y<<4)+(x>>3);
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for(i=begin_y ; i<end_y ; i++)
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{
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if(begin_x < end_x)
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{
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line = bmp[i*(real_width>>3)+begin_x] << shift;
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if(bool1) screen[begin_x] |= *p;
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if(shift!=8) screen[begin_x+1] |= *(p+1);
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for(j=begin_x+1 ; j<end_x ; j++)
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{
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line = 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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}
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line = bmp[i*(real_width>>3)+end_x];
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if(bool3) line &= -1<<real_width-width;
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line <<= shift;
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if(begin_x < end_x || bool1) screen[end_x] |= *p;
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if(bool2) screen[end_x+1] |= *(p+1);
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screen += 16;
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}
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}
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