1: /* Copyright 1985 Massachusetts Institute of Technology */
   2: 
   3: /* Routines to cache bitmaps and pixmaps in the frame buffer memory:
   4:  *
   5:  *	StoreBitmap	Creates a bitmap
   6:  *	FreeBitmap	Frees the storage taken by a bitmap
   7:  *	CharBitmap	Creates a bitmap from a font character
   8:  *	StorePixmap	Creates a pixmap
   9:  *	FreePixmap	Frees the storage taken by a pixmap
  10:  *	MakePixmap	Create a pixmap from a bitmap
  11:  *	PixmapSave	Save a region of the screen
  12:  *	PixmapGet	Read a region of the screen
  13:  *
  14:  */
  15: 
  16: #include "ddxqvss.h"
  17: #include "vstagbl.h"
  18: #include <errno.h>
  19: 
  20: extern int errno;
  21: 
  22: 
  23: char *Xalloc(), *AllocateSpace();
  24: PIXMAP *MakePixmap();
  25: 
  26: BITMAP *StoreBitmap (width, height, data)
  27:     int width, height;
  28:     char *data;
  29: {
  30:     register BITMAP *bm;
  31:     int size;
  32: 
  33:     bm = (BITMAP *) Xalloc (sizeof (BITMAP));
  34:     bm->width = width;
  35:     bm->height = height;
  36:     bm->refcnt = 1;
  37: 
  38:     size = BitmapSize(width, height);
  39:     if ((bm->data = (caddr_t) malloc (size)) == NULL) {
  40:         free ((caddr_t) bm);
  41:         return (NULL);
  42:     }
  43: 
  44:     bcopy (data, bm->data, size);
  45: 
  46:     return (bm);
  47: }
  48: 
  49: FreeBitmap (bitmap)
  50:     register BITMAP *bitmap;
  51: {
  52:     free ((caddr_t) bitmap->data);
  53:     free ((caddr_t) bitmap);
  54: }
  55: 
  56: BITMAP *CharBitmap (c, font)
  57:     unsigned c;
  58:     register FONT *font;
  59: {
  60:     int width;
  61:     register BITMAP *bm;
  62: 
  63:     if (c < font->first || c > font->last) {
  64:         errno = EINVAL;
  65:         return (NULL);
  66:     }
  67:     if (font->fixed)
  68:         width = font->avg_width;
  69:     else
  70:         width = FDATA(font)->widths[c - font->first];
  71:     if (width == 0) {
  72:         errno = EINVAL;
  73:         return (NULL);
  74:     }
  75:     bm = (BITMAP *) Xalloc (sizeof (BITMAP));
  76:     bm->width = width;
  77:     bm->height = font->height;
  78:     bm->refcnt = 1;
  79:     if ((bm->data =
  80:         (caddr_t) malloc (BitmapSize(width, bm->height))) == NULL) {
  81:         free ((caddr_t) bm);
  82:         errno = ENOMEM;
  83:         return (NULL);
  84:     }
  85: 
  86:     CopyText ((caddr_t) &c, 1, font, bm);
  87:     return (bm);
  88: }
  89: 
  90: /*ARGSUSED*/
  91: PIXMAP *StorePixmap (width, height, format, data)
  92:     int width, height, format;
  93:     char *data;
  94: {
  95:     register BITMAP *bm;
  96:     register PIXMAP *pm;
  97: 
  98:     bm = (BITMAP *) StoreBitmap (width, height, data);
  99:     if (bm == NULL)
 100:         return (NULL);
 101:     bm->refcnt = 0;
 102:     if (pm = MakePixmap (bm, 1, 0))
 103:         return (pm);
 104:     FreeBitmap (bm);
 105:     return (NULL);
 106: }
 107: 
 108: FreePixmap (pixmap)
 109:     register PIXMAP *pixmap;
 110: {
 111:     register BITMAP *bm;
 112: 
 113:     if (pixmap->kind) {
 114:         bm = PDATA(pixmap);
 115:         if (--bm->refcnt == 0)
 116:         FreeBitmap (bm);
 117:     }
 118:     free ((caddr_t) pixmap);
 119: }
 120: 
 121: PIXMAP constpix0 = {1, 1, 1, 1, ConstantPixmap, (caddr_t) 0};
 122: PIXMAP constpix1 = {1, 1, 1, 1, ConstantPixmap, (caddr_t) 1};
 123: 
 124: PIXMAP *MakePixmap (xymask, fore, back)
 125:     register BITMAP *xymask;
 126:     int fore, back;
 127: {
 128:     register PIXMAP *pm;
 129: 
 130:     if (xymask == NULL || !((fore ^ back) & 1)) {
 131:         if (fore & 1)
 132:         pm = &constpix1;
 133:         else
 134:         pm = &constpix0;
 135:         pm->refcnt++;
 136:         return (pm);
 137:     }
 138: 
 139:     pm = (PIXMAP *) Xalloc (sizeof (PIXMAP));
 140:     pm->width = xymask->width;
 141:     pm->height = xymask->height;
 142:     pm->refcnt = 1;
 143:     xymask->refcnt++;
 144:     pm->kind = BitmapPixmap;
 145:     pm->data = (caddr_t) xymask;
 146:     if (xymask->width == 16 && xymask->height == 16) {
 147:         pm->tile = CanBeTiled;
 148:     } else {
 149:         pm->tile = CannotBeTiled;
 150:     }
 151:     /* save a bit to indicate if we have to invert the source */
 152: 
 153:     if (back & 1)
 154:         pm->kind |= InvertFlag;
 155:     return (pm);
 156: }
 157: 
 158: PIXMAP *PixmapSave (srcx, srcy, width, height)
 159:     int srcx, srcy, width, height;
 160: {
 161:     register BITMAP *bm;
 162:     PIXMAP *pm;
 163:     extern BITMAP pbm;
 164: 
 165:     bm = (BITMAP *) Xalloc (sizeof (BITMAP));
 166:     bm->width = width;
 167:     bm->height = height;
 168:     bm->refcnt = 0;
 169: 
 170:     if ((bm->data =
 171:         (caddr_t) malloc (BitmapSize(width, height))) == NULL) {
 172:         free ((caddr_t) bm);
 173:         return (NULL);
 174:     }
 175:     copyrmsk(VSTA$K_SRC_BITMAP, (short *) pbm.data, pbm.width, pbm.height,
 176:         srcx, srcy, width, height,
 177:         (short *) bm->data, width, height,
 178:         0, 0, GXcopy, 0, 0);
 179:     if (pm = MakePixmap (bm, 1, 0))
 180:         return (pm);
 181:     FreeBitmap (bm);
 182:     return (NULL);
 183: }
 184: 
 185: /*ARGSUSED*/
 186: PixmapGet (srcx, srcy, width, height, client, format, swapit)
 187:     int srcx, srcy, width, height, client, format;
 188: {
 189:     PIXMAP *pm;
 190:     BITMAP *bm;
 191:     int slop;
 192:     char padding[2];
 193:     int size = BitmapSize(width, height);
 194:     slop = (width * height) & 2;
 195:     pm = PixmapSave (srcx, srcy, width, height);
 196:     bm = (BITMAP *) pm->data;
 197:     if (swapit)
 198:         Swap_shorts ( (short *) bm->data, size >> 1 );
 199:     Write (client, bm->data, size);
 200:     FreePixmap(pm);
 201:     if (slop)
 202:         Write (client, padding, slop);
 203: }

Defined functions

CharBitmap defined in line 56; never used
FreeBitmap defined in line 49; used 4 times
FreePixmap defined in line 108; used 1 times
MakePixmap defined in line 124; used 3 times
PixmapGet defined in line 186; never used
PixmapSave defined in line 158; used 1 times
StoreBitmap defined in line 26; used 1 times
  • in line 98
StorePixmap defined in line 91; never used

Defined variables

constpix0 defined in line 121; used 1 times
constpix1 defined in line 122; used 1 times
Last modified: 1986-01-28
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