source: abuse/tags/pd/imlib/port/svga/video.c @ 49

Last change on this file since 49 was 49, checked in by Sam Hocevar, 11 years ago
  • Imported original public domain release, for future reference.
  • Property svn:keywords set to Id
File size: 4.3 KB
RevLine 
[49]1#include "globals.hpp"
2#include "system.h"
3#include "video.hpp"
4#include "dos.h"
5#include "macs.hpp"
6#include "image.hpp"
7#include "vga.h"
8#include "palette.hpp"
9#include "jmalloc.hpp"
10
11
12unsigned char current_background;
13extern unsigned int xres,yres;
14extern palette *lastl;
15int vmode;
16image *screen;
17uchar *v_addr;
18
19int get_vmode()
20{ return vmode; }
21
22extern void JCMouse_init ();
23
24void set_mode(int mode, int argc, char **argv)
25{
26  int fail=0,i;
27  if (mode==19)
28    mode=G320x200x256;
29  for (i=1;i<argc;i++)
30  {
31    if (!strcmp(argv[i],"-vmode"))
32    { i++;
33      if (!strcmp(argv[i],"G320x200x256")) mode=G320x200x256;
34      else if (!strcmp(argv[i],"G640x480x256")) mode=G640x480x256;
35      else if (!strcmp(argv[i],"G800x600x256")) mode=G800x600x256;
36      else if (!strcmp(argv[i],"G1024x768x256")) mode=G1024x768x256;
37      else fail=1;
38    }
39  } 
40  if (fail)
41  { printf("Graphics modes supported :\n"
42            "  G320x200x256, G640x480x256, G800x600x256, G1024x768x256\n"
43            "  usage : %s [program options] [-vmode G....]\n",argv[0]);
44    exit(1);
45  }
46  JCMouse_init();
47  vga_init();
48  vga_setmode(mode);
49  v_addr=vga_getgraphmem();
50  xres=vga_getxdim()-1;
51  yres=vga_getydim()-1;
52
53  vmode=mode;
54  screen=new image(xres+1,yres+1,NULL,2);
55  screen->clear();
56  update_dirty(screen);
57}
58
59void close_graphics()
60{
61  if (lastl)
62    delete lastl;
63  lastl=NULL;
64  vga_setmode(0);
65}
66
67inline void jmemcpy(long *dest, long *src, long size)
68{
69  register long *s=src;
70  register long *d=dest;
71
72  size>>=2;  // doing word at a time
73  while (size--)
74    *(d++)=*(s++); 
75}
76
77void put_part(image *im, int x, int y, int x1, int y1, int x2, int y2)
78{
79  unsigned long screen_off;
80  int ys,ye,         // ystart, yend
81        xs,xe,     
82        page,last_page=-1,yy;
83  long breaker;
84  unsigned char *line_addr;
85
86  if (y>(int)yres || x>(int)xres) return ;
87  CHECK(y1>=0 && y2>=y1 && x1>=0 && x2>=x1);
88
89
90  if (y<0)
91  { y1+=-y; y=0; }
92  ys=y1;
93  if (y+(y2-y1)>=(int)yres)
94    ye=(int)yres-y+y1-1;
95  else ye=y2;
96
97  if (x<0)
98  { x1+=-x; x=0; }
99  xs=x1;
100  if (x+(x2-x1)>=(int)xres)
101    xe=(int)xres-x+x1-1;
102  else xe=x2;
103  if (xs>xe || ys>ye) return ;
104
105  // find the memory offset for the scan line of interest
106  screen_off=((long)y*(long)(xres+1));
107
108
109  for (yy=ys;yy<=ye;yy++,screen_off+=(xres+1))
110  {
111    page=screen_off>>16;     // which page of 64k are we on?
112    if (page!=last_page)     
113    { last_page=page;
114      vga_setpage(page);     // switch to new bank
115    }
116
117    line_addr=im->scan_line(yy)+xs;  // get address of image scan line
118
119    // breaker is the number of bytes before the page split
120    breaker=(long)0xffff-(long)(screen_off&0xffff)+1;
121
122
123    // see if the slam gets split by the page break
124    if (breaker>x+xe-xs)
125    {
126      void *dest=v_addr+(screen_off&0xffff)+x;
127      int size=xe-xs+1;
128      memcpy(dest,line_addr,size);
129    }
130    else if (breaker<=x)
131    { last_page++;
132      vga_setpage(last_page);
133      memcpy(v_addr+x-breaker,line_addr,xe-xs+1);
134    }
135    else
136    {
137      memcpy(v_addr+(screen_off&0xffff)+x,line_addr,breaker-x);
138      last_page++;
139      vga_setpage(last_page);
140      memcpy(v_addr,line_addr+breaker-x,xe-xs-(breaker-x)+1);
141    }
142    y++;   
143  }
144}
145
146void put_image(image *im, int x, int y)
147{ put_part(im,x,y,0,0,im->width()-1,im->height()-1); }
148
149
150void update_dirty(image *im, int xoff, int yoff)
151{
152
153  int count;
154  dirty_rect *dr,*q;
155  CHECK(im->special);  // make sure the image has the ablity to contain dirty areas
156  if (im->special->keep_dirt==0)
157    put_image(im,0,0);
158  else
159  {
160    count=im->special->dirties.number_nodes();
161    if (!count) return;  // if nothing to update, return
162    (linked_node *) dr=im->special->dirties.first();
163    while (count>0)
164    {
165      put_part(im,dr->dx1+xoff,dr->dy1+yoff,dr->dx1,dr->dy1,dr->dx2,dr->dy2);
166      q=dr;
167      (linked_node *)dr=dr->next();
168      im->special->dirties.unlink((linked_node *)q);
169      delete q;
170      count--;
171    }
172  }
173}
174
175
176void palette::load()
177{
178  if (lastl)
179    delete lastl;
180  lastl=copy();
181  for (int i=0;i<ncolors;i++)
182    vga_setpalette(i,red(i)>>2,green(i)>>2,blue(i)>>2);
183}
184
185void palette::load_nice()
186{ load(); }
187
188
189void image::make_page(short width, short height, unsigned char *page_buffer)
190{
191  if (page_buffer)
192    data=page_buffer;
193  else data=(unsigned char *)jmalloc(width*height,"image::data");
194}
195void image::delete_page()
196{
197  if (!special || !special->static_mem)
198    jfree(data);     
199}
Note: See TracBrowser for help on using the repository browser.