Usermode/Applications/axwin0_src/graphics.c

   1 /*\r
   2 Acess OS Window Manager\r
   3 */\r
   4 #include "header.h"\r
   5 \r
   6 #define ABS(x)  ((x)<0?-(x):(x))\r
   7 #define PLOT(x,y,colour)        (gScreenBuffer[(y)*SCREEN_WIDTH+(x)] = (colour))\r
   8 \r
   9 void draw_line(int x1, int y1, int x2, int y2, Uint32 colour)\r
  10 {\r
  11         int dy, dx;\r
  12         int     i;\r
  13         float   step;\r
  14         \r
  15         dy = ABS(y2 - y1);\r
  16         dx = ABS(x2 - x1);\r
  17         \r
  18         if(dx == 0) {\r
  19                 if(y1 < y2) {\r
  20                         for(i=y1;i<y2;i++)\r
  21                                 PLOT(x1, i, colour);\r
  22                 } else {\r
  23                         for(i=y2;i<y1;i++)\r
  24                                 PLOT(x1, i, colour);\r
  25                 }\r
  26         }\r
  27         \r
  28         if(x1 < x2) {\r
  29                 step = (dy/dx); step = (y2>y1?step:-step);\r
  30                 for(i=x1;i<x2;i++)      PLOT(i, y1+(int)(step*i), colour);\r
  31         } else {\r
  32                 step = (dy/dx); step = (y2>y1?-step:step);\r
  33                 for(i=x2;i<x1;i++)      PLOT(i, y1+(int)(step*i), colour);\r
  34         }\r
  35 }\r
  36 \r
  37 void draw_rect(int x, int y, int w, int h, Uint32 colour)\r
  38 {\r
  39         Uint32  *p = gScreenBuffer+y*SCREEN_WIDTH+x;\r
  40         int             i, j;\r
  41         \r
  42         for(j=0;j<h;j++) {\r
  43                 for(i=0;i<w;i++)        *(p+i) = colour;\r
  44                 p += SCREEN_WIDTH;\r
  45         }\r
  46 }\r
  47 \r
  48 void draw_bmp(BITMAP *bmp, RECT *rc)\r
  49 {\r
  50         int w, h, i, j;\r
  51         Uint32  a;\r
  52         int     r,g,b;\r
  53         Uint32  *buf, *bi;\r
  54         Uint16  *bi16;\r
  55         Uint8   *bi8;\r
  56         \r
  57         #if DEBUG\r
  58                 k_printf("draw_bmp: (bmp=0x%x, rc=0x%x)\n", bmp, rc);\r
  59         #endif\r
  60         \r
  61         buf = gScreenBuffer+rc->y1*SCREEN_WIDTH+rc->x1;\r
  62         bi = bmp->data; bi16 = bmp->data;       bi8 = bmp->data;\r
  63         w = bmp->width;\r
  64         h = bmp->height;\r
  65         \r
  66         #if DEBUG\r
  67                 k_printf(" draw_bmp: bmp->bpp = %i\n", bmp->bpp);\r
  68         #endif\r
  69         \r
  70         switch(bmp->bpp)\r
  71         {\r
  72         // === 32bit Colour ===\r
  73         case 32:\r
  74                 for(i = 0; i < h; i++)\r
  75                 {\r
  76                         for(j = 0; j < w; j++)\r
  77                         {\r
  78                                 a = *bi >> 24;\r
  79                                 switch(a)\r
  80                                 {\r
  81                                 case 0xFF:      //Fully Visible\r
  82                                         buf[j] = *bi;\r
  83                                         break;\r
  84                                 case 0x80:      // 50/50\r
  85                                         r = ((*bi>>16)&0xFF) + ((*buf>>16)&0xFF);\r
  86                                         g = ((*bi>>8)&0xFF) + ((*buf>>8)&0xFF);\r
  87                                         b = ((*bi)&0xFF) + ((*buf)&0xFF);\r
  88                                         r >>= 1;        g >>= 1;        b >>= 1;\r
  89                                         buf[j] = (r<<16) | (g<<8) | b;\r
  90                                         break;\r
  91                                 case 0x00:      // Fully Transparent\r
  92                                         break;\r
  93                                 default:        // Everything else\r
  94                                         r = ((*bi>>16)&0xFF)*(255-a) + ((*buf>>16)&0xFF)*a;\r
  95                                         g = ((*bi>>8)&0xFF)*(255-a) + ((*buf>>8)&0xFF)*a;\r
  96                                         b = ((*bi)&0xFF)*(255-a) + ((*buf)&0xFF)*a;\r
  97                                         r >>= 8;        g >>= 8;        b >>= 8;\r
  98                                         buf[j] = (r<<16) | (g<<8) | b;\r
  99                                         break;\r
 100                                 }\r
 101                                 bi++;\r
 102                         }\r
 103                         buf += SCREEN_WIDTH;\r
 104                 }\r
 105                 break;\r
 106         }\r
 107 }\r