home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Very Best of Atari Inside
/
The Very Best of Atari Inside 1.iso
/
mint
/
mgr_2
/
src
/
atari
/
bitmap.c
< prev
next >
Wrap
C/C++ Source or Header
|
1990-09-23
|
7KB
|
276 lines
/* SUN version of portable bit-blt code. (S. A. Uhler)
* The data on each line is padded to (BITS+1) bits
*/
#ifdef sun
# include <sys/ioctl.h>
# include <sun/fbio.h>
# include <sys/file.h>
# include <sys/mman.h>
#endif
#ifdef atarist
# include <linea.h>
# include <osbind.h>
char *_scrnbase;
int _scrwidth, _scrheight, _scrplanes;
short *Ptsin, *Intin;
short _ptsin[10], _intsin[10];
#endif
#include <stdio.h>
#include "bitmap.h"
#define dprintf if(bit_debug)fprintf
int bit_debug;
static int _s_start; /* for our "vfree" */
static _s_len;
/* open the display; it looks like memory */
BITMAP *
bit_open(name)
char *name; /* name of frame buffer */
{
BITMAP *result = BIT_NULL;
#ifdef sun
int fd; /* file descriptor of frame buffer */
register DATA *addr; /* address of frame buffer */
struct fbtype buff; /* frame buffer parameters */
int pagesize;
char *malloc();
/* open the SUN display */
if ((fd = open(name, O_RDWR)) < 0)
return (BIT_NULL);
/* get the frame buffer size */
if (ioctl(fd, FBIOGTYPE, &buff) < 0)
return (BIT_NULL);
/* malloc space for frame buffer */
pagesize = getpagesize();
if ((_s_start = (int) malloc(buff.fb_size + pagesize)) == 0)
return (BIT_NULL);
/* align space (and fb size) on a page boundary */
buff.fb_size = (buff.fb_size+pagesize-1) &~ (pagesize-1);
addr = (DATA *) ((_s_start + pagesize - 1) & ~(pagesize - 1));
/* map the frame buffer into malloc'd space */
#ifdef _MAP_NEW /* New semantics for mmap in Sun release 4.0 */
addr = (DATA) mmap(addr, _s_len=buff.fb_size,
PROT_READ|PROT_WRITE, _MAP_NEW|MAP_SHARED, fd, 0);
if ((int)addr == -1)
return (BIT_NULL);
#else
if (mmap(addr, _s_len = buff.fb_size, PROT_WRITE, MAP_SHARED, fd, 0) < 0)
return (BIT_NULL);
#endif
if ((result = (BITMAP *) malloc(sizeof(BITMAP))) == (BITMAP *) 0)
return (BIT_NULL);
result->primary = result;
result->data = addr;
result->x0 = 0,
result->y0 = 0,
result->wide = buff.fb_width;
result->high = buff.fb_height;
result->type = _SCREEN;
#endif sun
#ifdef atarist
extern void *malloc();
if ((result = (BITMAP *) malloc(sizeof(BITMAP))) == (BITMAP *) 0)
return (BIT_NULL);
result->primary = result;
linea0();
Intin = __aline->_INTIN;
if (!Intin) {
__aline->_INTIN = Intin = _intsin;
}
Ptsin = __aline->_PTSIN;
if (!Ptsin) {
__aline->_PTSIN = Ptsin = _ptsin;
}
_scrplanes = __aline->_VPLANES;
_scrheight = V_Y_MAX;
_scrwidth = V_X_MAX;
result->data = Logbase();
result->x0 = 0;
result->y0 = 0;
result->wide = _scrwidth;
result->high = _scrheight;
result->type = _SCREEN;
#endif atarist
return (result);
}
/* destroy a bitmap, free up space */
int
bit_destroy(bitmap)
BITMAP *bitmap;
{
if (bitmap == (BITMAP *) 0)
return (-1);
if (IS_MEMORY(bitmap) && IS_PRIMARY(bitmap))
free(bitmap->data);
#ifndef atarist
else if (IS_SCREEN(bitmap) && IS_PRIMARY(bitmap)) {
munmap(BIT_DATA(bitmap), _s_len);
free(_s_start);
}
#endif
free(bitmap);
return (0);
}
/* create a bitmap as a sub-rectangle of another bitmap */
BITMAP *
bit_create(map, x, y, wide, high)
BITMAP *map;
int x, y, wide, high;
{
char *malloc();
register BITMAP *result;
if (x + wide > map->wide)
wide = map->wide - x;
if (y + high > map->high)
high = map->high - y;
if (wide < 1 || high < 1)
return (BIT_NULL);
if ((result = (BITMAP *) malloc(sizeof(BITMAP))) == (BITMAP *) 0)
return (BIT_NULL);
result->data = map->data;
result->x0 = map->x0 + x;
result->y0 = map->y0 + y;
result->wide = wide;
result->high = high;
result->primary = map->primary;
result->type = map->type;
return (result);
}
/* allocate space for, and create a memory bitmap */
BITMAP *
bit_alloc(wide, high, data, bits)
unsigned short wide, high;
DATA *data;
int bits; /* in preparation for color */
{
char *malloc();
register BITMAP *result;
register int size;
if ((result = (BITMAP *) malloc(sizeof(BITMAP))) == (BITMAP *) 0)
return (result);
result->x0 = 0;
result->y0 = 0;
result->high = high;
result->wide = wide;
size = ((wide+BITS)/8) * high;
if (data != (DATA *) 0) { /* point to user supplied data */
result->data = data;
/* convert from external to internal format (if required) */
if (DOFLIP) {
flip(data,size/sizeof(DATA));
}
}
else { /* malloc space: better be DATA aligned */
if ((result->data = (DATA *) malloc(size)) == (DATA *) 0) {
free(result);
return ((BITMAP *) 0);
}
bzero(result->data,size);
}
#ifdef atarist
if ((int) result->data & 1)
fprintf(stderr,"bit_alloc(): boundary alignment error\n");
#else
if ((int) result->data &3)
fprintf(stderr,"bit_alloc(): boundary alignment error\n");
#endif
result->primary = result;
result->type = _MEMORY;
return (result);
}
/* flip the bit order on count elements of s */
static unsigned char flp[256] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
/*
* Convert from external to internal bitmap format. Internal format
* is SUN-3 bit order, 1=black, 0=white. This sample flip routine is
* for the DEC3100, where 1=white, 0=black, and the bits in every byte
* are revered
*/
int
flip(s,count,how)
register DATA *s;
register int count;
int how; /* not used */
{
while (count-- > 0)
*s++ = ~((flp[*s&0xff]) | (flp[*s>>8&0xff]<<8) |
(flp[*s>>16&0xff]<<16) | (flp[*s>>24&0xff]<<24));
}