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xvbmp.c
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xvbmp.c
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/*
* xvbmp.c - I/O routines for .BMP files (MS Windows 3.x and later; OS/2)
*
* LoadBMP(fname, numcols)
* WriteBMP(fp, pic, ptype, w, h, r, g, b, numcols, style);
*/
#include "copyright.h"
#include "xv.h"
/* Comments on error-handling:
A truncated file is not considered a Major Error. The file is loaded,
and the rest of the pic is filled with 0's.
A file with garbage characters in it is an unloadable file. All allocated
stuff is tossed, and LoadBMP returns non-zero.
Not being able to malloc is a Fatal Error. The program is aborted. */
#define BI_RGB 0 /* a.k.a. uncompressed */
#define BI_RLE8 1
#define BI_RLE4 2
#define BI_BITFIELDS 3 /* BMP version 4 */
#define BI_JPEG 4 /* BMP version 5 (not yet supported) */
#define BI_PNG 5 /* BMP version 5 (not yet supported) */
#define WIN_OS2_OLD 12
#define WIN_NEW 40
#define OS2_NEW 64
#if (defined(UINT_MAX) && UINT_MAX != 0xffffffffU)
# error XV's BMP code requires 32-bit unsigned integer type, but u_int isn't
#endif
static long filesize;
static int loadBMP1 PARM((FILE *, byte *, u_int, u_int));
static int loadBMP4 PARM((FILE *, byte *, u_int, u_int, u_int));
static int loadBMP8 PARM((FILE *, byte *, u_int, u_int, u_int));
static int loadBMP16 PARM((FILE *, byte *, u_int, u_int, u_int *));
static int loadBMP24 PARM((FILE *, byte *, u_int, u_int, u_int));
static int loadBMP32 PARM((FILE *, byte *, u_int, u_int, u_int *));
static u_int getshort PARM((FILE *));
static u_int getint PARM((FILE *));
static void putshort PARM((FILE *, int));
static void putint PARM((FILE *, int));
static void writeBMP1 PARM((FILE *, byte *, int, int));
static void writeBMP4 PARM((FILE *, byte *, int, int));
static void writeBMP8 PARM((FILE *, byte *, int, int));
static void writeBMP24 PARM((FILE *, byte *, int, int));
static int bmpError PARM((const char *, const char *));
#define FERROR(fp) (ferror(fp) || feof(fp))
/*******************************************/
int LoadBMP(fname, pinfo)
char *fname;
PICINFO *pinfo;
/*******************************************/
{
FILE *fp;
int i, c, c1, rv, bPad;
u_int bfSize, bfOffBits, biSize, biWidth, biHeight, biPlanes;
u_int biBitCount, biCompression, biSizeImage, biXPelsPerMeter;
u_int biYPelsPerMeter, biClrUsed, biClrImportant;
u_int colormask[3];
char buf[512], rgb_bits[16];
const char *cmpstr, *bname;
byte *pic24, *pic8;
/* returns '1' on success */
pic8 = pic24 = (byte *) NULL;
bname = BaseName(fname);
fp = xv_fopen(fname,"r");
if (!fp) return (bmpError(bname, "couldn't open file"));
fseek(fp, 0L, 2); /* figure out the file size */
filesize = ftell(fp);
fseek(fp, 0L, 0);
/* read the file type (first two bytes) */
c = getc(fp); c1 = getc(fp);
if (c!='B' || c1!='M') { bmpError(bname,"file type != 'BM'"); goto ERROR; }
bfSize = getint(fp);
getshort(fp); /* reserved and ignored */
getshort(fp);
bfOffBits = getint(fp);
biSize = getint(fp);
if (biSize == WIN_NEW || biSize == OS2_NEW) {
biWidth = getint(fp);
biHeight = getint(fp);
biPlanes = getshort(fp);
biBitCount = getshort(fp);
biCompression = getint(fp);
biSizeImage = getint(fp);
biXPelsPerMeter = getint(fp);
biYPelsPerMeter = getint(fp);
biClrUsed = getint(fp);
biClrImportant = getint(fp);
}
else { /* old bitmap format */
biWidth = getshort(fp); /* Types have changed ! */
biHeight = getshort(fp);
biPlanes = getshort(fp);
biBitCount = getshort(fp);
/* not in old versions, so have to compute them */
biSizeImage = (((biPlanes * biBitCount*biWidth)+31)/32)*4*biHeight;
biCompression = BI_RGB;
biXPelsPerMeter = biYPelsPerMeter = 0;
biClrUsed = biClrImportant = 0;
}
if (DEBUG>1) {
fprintf(stderr,"\nLoadBMP:\tbfSize=%d, bfOffBits=%d\n",bfSize,bfOffBits);
fprintf(stderr,"\t\tbiSize=%d, biWidth=%d, biHeight=%d, biPlanes=%d\n",
biSize, biWidth, biHeight, biPlanes);
fprintf(stderr,"\t\tbiBitCount=%d, biCompression=%d, biSizeImage=%d\n",
biBitCount, biCompression, biSizeImage);
fprintf(stderr,"\t\tbiX,YPelsPerMeter=%d,%d biClrUsed=%d, biClrImp=%d\n",
biXPelsPerMeter, biYPelsPerMeter, biClrUsed, biClrImportant);
}
if (FERROR(fp)) { bmpError(bname,"EOF reached in file header"); goto ERROR; }
/* error-checking */
if ((biBitCount!=1 && biBitCount!=4 && biBitCount!=8 &&
biBitCount!=16 && biBitCount!=24 && biBitCount!=32) ||
biPlanes!=1 || biCompression>BI_PNG ||
biWidth<=0 || biHeight<=0 ||
(biClrUsed && biClrUsed > (1 << biBitCount))) {
sprintf(buf,
"Unsupported BMP type (%dx%d, Bits=%d, Colors=%d, Planes=%d, "
"Compr=%d)",
biWidth, biHeight, biBitCount, biClrUsed, biPlanes, biCompression);
bmpError(bname, buf);
goto ERROR;
}
if (biCompression>BI_BITFIELDS) {
sprintf(buf, "Unsupported BMP compression method (%s)",
biCompression == BI_JPEG? "JPEG" :
biCompression == BI_PNG? "PNG" :
"unknown/newer than v5");
bmpError(bname, buf);
goto ERROR;
}
if (((biBitCount==1 || biBitCount==24) && biCompression != BI_RGB) ||
(biBitCount==4 && biCompression!=BI_RGB && biCompression!=BI_RLE4) ||
(biBitCount==8 && biCompression!=BI_RGB && biCompression!=BI_RLE8) ||
((biBitCount==16 || biBitCount==32) &&
biCompression!=BI_RGB && biCompression!=BI_BITFIELDS)) {
sprintf(buf,"Unsupported BMP type (bitCount=%d, Compression=%d)",
biBitCount, biCompression);
bmpError(bname, buf);
goto ERROR;
}
bPad = 0;
if (biSize != WIN_OS2_OLD) {
/* skip ahead to colormap, using biSize */
c = biSize - 40; /* 40 bytes read from biSize to biClrImportant */
for (i=0; i<c; i++)
getc(fp);
bPad = bfOffBits - (biSize + 14);
}
/* 16-bit or 32-bit color mask */
if (biCompression==BI_BITFIELDS) {
colormask[0] = getint(fp);
colormask[1] = getint(fp);
colormask[2] = getint(fp);
bPad -= 12;
}
/* load up colormap, if any */
if (biBitCount == 1 || biBitCount == 4 || biBitCount == 8) {
int i, cmaplen;
cmaplen = (biClrUsed) ? biClrUsed : 1 << biBitCount;
for (i=0; i<cmaplen; i++) {
pinfo->b[i] = getc(fp);
pinfo->g[i] = getc(fp);
pinfo->r[i] = getc(fp);
if (biSize != WIN_OS2_OLD) {
getc(fp);
bPad -= 4;
}
}
if (FERROR(fp))
{ bmpError(bname,"EOF reached in BMP colormap"); goto ERROR; }
if (DEBUG>1) {
fprintf(stderr,"LoadBMP: BMP colormap: (RGB order)\n");
for (i=0; i<cmaplen; i++) {
fprintf(stderr,"%02x%02x%02x ", pinfo->r[i],pinfo->g[i],pinfo->b[i]);
}
fprintf(stderr,"\n\n");
}
}
if (biSize != WIN_OS2_OLD) {
/* Waste any unused bytes between the colour map (if present)
and the start of the actual bitmap data. */
while (bPad > 0) {
(void) getc(fp);
bPad--;
}
}
/* create pic8 or pic24 */
if (biBitCount==16 || biBitCount==24 || biBitCount==32) {
u_int npixels = biWidth * biHeight;
u_int count = 3 * npixels;
if (biWidth == 0 || biHeight == 0 || npixels/biWidth != biHeight ||
count/3 != npixels)
return (bmpError(bname, "image dimensions too large"));
pic24 = (byte *) calloc((size_t) count, (size_t) 1);
if (!pic24) return (bmpError(bname, "couldn't malloc 'pic24'"));
}
else {
u_int npixels = biWidth * biHeight;
if (biWidth == 0 || biHeight == 0 || npixels/biWidth != biHeight)
return (bmpError(bname, "image dimensions too large"));
pic8 = (byte *) calloc((size_t) npixels, (size_t) 1);
if (!pic8) return(bmpError(bname, "couldn't malloc 'pic8'"));
}
WaitCursor();
/* load up the image */
switch (biBitCount) {
case 1:
rv = loadBMP1(fp, pic8, biWidth, biHeight);
break;
case 4:
rv = loadBMP4(fp, pic8, biWidth, biHeight, biCompression);
break;
case 8:
rv = loadBMP8(fp, pic8, biWidth, biHeight, biCompression);
break;
case 16:
rv = loadBMP16(fp, pic24, biWidth, biHeight, /* v-- BI_RGB */
biCompression == BI_BITFIELDS? colormask : NULL);
break;
default:
if (biBitCount == 32 && biCompression == BI_BITFIELDS)
rv = loadBMP32(fp, pic24, biWidth, biHeight, colormask);
else /* 24 or (32 and BI_RGB) */
rv = loadBMP24(fp, pic24, biWidth, biHeight, biBitCount);
break;
}
if (rv) bmpError(bname, "File appears truncated. Winging it.");
fclose(fp);
if (biBitCount > 8) {
pinfo->pic = pic24;
pinfo->type = PIC24;
}
else {
pinfo->pic = pic8;
pinfo->type = PIC8;
}
cmpstr = "";
if (biCompression == BI_RLE4) cmpstr = ", RLE4 compressed";
else if (biCompression == BI_RLE8) cmpstr = ", RLE8 compressed";
else if (biCompression == BI_BITFIELDS) {
int bit, c[3], i;
u_int mask;
for (i = 0; i < 3; ++i) {
mask = colormask[i];
c[i] = 0;
for (bit = 0; bit < 32; ++bit) {
if (mask & 1)
++c[i];
mask >>= 1;
}
}
sprintf(rgb_bits, ", RGB%d%d%d", c[0], c[1], c[2]);
cmpstr = rgb_bits;
}
pinfo->w = biWidth; pinfo->h = biHeight;
pinfo->normw = pinfo->w; pinfo->normh = pinfo->h;
pinfo->frmType = F_BMP;
pinfo->colType = F_FULLCOLOR;
sprintf(pinfo->fullInfo, "%sBMP, %d bit%s per pixel%s. (%ld bytes)",
((biSize==WIN_OS2_OLD) ? "Old OS/2 " :
(biSize==WIN_NEW) ? "Windows " : ""),
biBitCount, (biBitCount == 1) ? "" : "s",
cmpstr, filesize);
sprintf(pinfo->shrtInfo, "%dx%d BMP.", biWidth, biHeight);
pinfo->comment = (char *) NULL;
return 1;
ERROR:
fclose(fp);
return 0;
}
/*******************************************/
static int loadBMP1(fp, pic8, w, h)
FILE *fp;
byte *pic8;
u_int w,h;
{
int i,j,c,bitnum,padw;
byte *pp = pic8 + ((h - 1) * w);
size_t l = w*h;
c = 0;
padw = ((w + 31)/32) * 32; /* 'w', padded to be a multiple of 32 */
for (i=h-1; i>=0 && (pp - pic8 <= l); i--) {
pp = pic8 + (i * w);
if ((i&0x3f)==0) WaitCursor();
for (j=bitnum=0; j<padw; j++,bitnum++) {
if ((bitnum&7) == 0) { /* read the next byte */
c = getc(fp);
bitnum = 0;
}
if (j<w) {
*pp++ = (c & 0x80) ? 1 : 0;
c <<= 1;
}
}
if (FERROR(fp)) break;
}
return (FERROR(fp));
}
/*******************************************/
static int loadBMP4(fp, pic8, w, h, comp)
FILE *fp;
byte *pic8;
u_int w,h,comp;
{
int i,j,c,c1,x,y,nybnum,padw,rv;
byte *pp = pic8 + ((h - 1) * w);
size_t l = w*h;
rv = 0;
c = c1 = 0;
if (comp == BI_RGB) { /* read uncompressed data */
padw = ((w + 7)/8) * 8; /* 'w' padded to a multiple of 8pix (32 bits) */
for (i=h-1; i>=0 && (pp - pic8 <= l); i--) {
pp = pic8 + (i * w);
if ((i&0x3f)==0) WaitCursor();
for (j=nybnum=0; j<padw; j++,nybnum++) {
if ((nybnum & 1) == 0) { /* read next byte */
c = getc(fp);
nybnum = 0;
}
if (j<w) {
*pp++ = (c & 0xf0) >> 4;
c <<= 4;
}
}
if (FERROR(fp)) break;
}
}
else if (comp == BI_RLE4) { /* read RLE4 compressed data */
x = y = 0;
pp = pic8 + x + (h-y-1)*w;
while (y<h) {
c = getc(fp); if (c == EOF) { rv = 1; break; }
if (c) { /* encoded mode */
c1 = getc(fp);
for (i=0; i<c && (pp - pic8 <= l); i++,x++,pp++)
*pp = (i&1) ? (c1 & 0x0f) : ((c1>>4)&0x0f);
}
else { /* c==0x00 : escape codes */
c = getc(fp); if (c == EOF) { rv = 1; break; }
if (c == 0x00) { /* end of line */
x=0; y++; pp = pic8 + x + (h-y-1)*w;
}
else if (c == 0x01) break; /* end of pic8 */
else if (c == 0x02) { /* delta */
c = getc(fp); x += c;
c = getc(fp); y += c;
pp = pic8 + x + (h-y-1)*w;
}
else { /* absolute mode */
for (i=0; i<c && (pp - pic8 <= l); i++, x++, pp++) {
if ((i&1) == 0) c1 = getc(fp);
*pp = (i&1) ? (c1 & 0x0f) : ((c1>>4)&0x0f);
}
if (((c&3)==1) || ((c&3)==2)) getc(fp); /* read pad byte */
}
} /* escape processing */
if (FERROR(fp)) break;
} /* while */
}
else {
fprintf(stderr,"unknown BMP compression type 0x%0x\n", comp);
}
if (FERROR(fp)) rv = 1;
return rv;
}
/*******************************************/
static int loadBMP8(fp, pic8, w, h, comp)
FILE *fp;
byte *pic8;
u_int w,h,comp;
{
int i,j,c,c1,padw,x,y,rv;
byte *pp = pic8 + ((h - 1) * w);
size_t l = w*h;
byte *pend;
rv = 0;
pend = pic8 + w * h;
if (comp == BI_RGB) { /* read uncompressed data */
padw = ((w + 3)/4) * 4; /* 'w' padded to a multiple of 4pix (32 bits) */
for (i=h-1; i>=0 && (pp - pic8 <= l); i--) {
pp = pic8 + (i * w);
if ((i&0x3f)==0) WaitCursor();
for (j=0; j<padw; j++) {
c = getc(fp); if (c==EOF) rv = 1;
if (j<w) *pp++ = c;
}
if (FERROR(fp)) break;
}
}
else if (comp == BI_RLE8) { /* read RLE8 compressed data */
x = y = 0;
pp = pic8 + x + (h-y-1)*w;
while (y<h && pp<=pend) {
c = getc(fp); if (c == EOF) { rv = 1; break; }
if (c) { /* encoded mode */
c1 = getc(fp);
for (i=0; i<c && pp<=pend; i++,x++,pp++) *pp = c1;
}
else { /* c==0x00 : escape codes */
c = getc(fp); if (c == EOF) { rv = 1; break; }
if (c == 0x00) { /* end of line */
x=0; y++; pp = pic8 + x + (h-y-1)*w;
}
else if (c == 0x01) break; /* end of pic8 */
else if (c == 0x02) { /* delta */
c = getc(fp); x += c;
c = getc(fp); y += c;
pp = pic8 + x + (h-y-1)*w;
}
else { /* absolute mode */
for (i=0; i<c && pp<=pend; i++, x++, pp++) {
c1 = getc(fp);
*pp = c1;
}
if (c & 1) getc(fp); /* odd length run: read an extra pad byte */
}
} /* escape processing */
if (FERROR(fp)) break;
} /* while */
}
else {
fprintf(stderr,"unknown BMP compression type 0x%0x\n", comp);
}
if (FERROR(fp)) rv = 1;
return rv;
}
/*******************************************/
static int loadBMP16(fp, pic24, w, h, mask)
FILE *fp;
byte *pic24;
u_int w, h, *mask;
{
int x, y;
byte *pp = pic24 + ((h - 1) * w * 3);
size_t l = w*h*3;
u_int buf, colormask[6];
int i, bit, bitshift[6], colorbits[6], bitshift2[6];
if (mask == NULL) { /* RGB555 */
colormask[0] = 0x00007c00;
colormask[1] = 0x000003e0;
colormask[2] = 0x0000001f;
colormask[3] = 0x7c000000;
colormask[4] = 0x03e00000;
colormask[5] = 0x001f0000;
bitshift[0] = 7; bitshift2[0] = 0;
bitshift[1] = 2; bitshift2[1] = 0;
bitshift[2] = 0; bitshift2[2] = 3;
bitshift[3] = 23; bitshift2[3] = 0;
bitshift[4] = 18; bitshift2[4] = 0;
bitshift[5] = 13; bitshift2[5] = 0;
} else {
colormask[0] = mask[0];
colormask[1] = mask[1];
colormask[2] = mask[2];
colormask[3] = (mask[0] & 0xffff) << 16;
colormask[4] = (mask[1] & 0xffff) << 16;
colormask[5] = (mask[2] & 0xffff) << 16;
for (i = 0; i < 3; ++i) {
buf = colormask[i];
bitshift[i] = 0;
for (bit = 0; bit < 32; ++bit) {
if (buf & 1)
break;
else
++bitshift[i];
buf >>= 1;
}
bitshift[i+3] = bitshift[i] + 16;
colorbits[i] = 0;
for (; bit < 32; ++bit) {
if (buf & 1)
++colorbits[i];
else
break;
buf >>= 1;
}
if (colorbits[i] > 8) { /* over 8-bit depth */
bitshift[i] += (colorbits[i] - 8);
bitshift[i+3] = bitshift[i] + 16;
bitshift2[i] = bitshift2[i+3] = 0;
} else
bitshift2[i] = bitshift2[i+3] = 8 - colorbits[i];
}
}
if (DEBUG > 1)
fprintf(stderr, "loadBMP16: bitfields\n"
"\tR: bits = %2d, mask = %08x, shift >>%2d, <<%2d\n"
"\t (mask = %08x, shift >>%2d, <<%2d)\n"
"\tG: bits = %2d, mask = %08x, shift >>%2d, <<%2d\n"
"\t (mask = %08x, shift >>%2d, <<%2d)\n"
"\tB: bits = %2d, mask = %08x, shift >>%2d, <<%2d\n"
"\t (mask = %08x, shift >>%2d, <<%2d)\n",
colorbits[0], colormask[0], bitshift[0], bitshift2[0],
colormask[3], bitshift[3], bitshift2[3],
colorbits[1], colormask[1], bitshift[1], bitshift2[1],
colormask[4], bitshift[4], bitshift2[4],
colorbits[2], colormask[2], bitshift[2], bitshift2[2],
colormask[5], bitshift[5], bitshift2[5]);
for (y = h-1; y >= 0 && (pp - pic24 <= l); y--) {
pp = pic24 + (3 * w * y);
if ((y&0x3f)==0) WaitCursor();
for (x = w; x > 1; x -= 2) {
buf = getint(fp);
*(pp++) = (buf & colormask[0]) >> bitshift[0] << bitshift2[0];
*(pp++) = (buf & colormask[1]) >> bitshift[1] << bitshift2[1];
*(pp++) = (buf & colormask[2]) >> bitshift[2] << bitshift2[2];
*(pp++) = (buf & colormask[3]) >> bitshift[3] << bitshift2[3];
*(pp++) = (buf & colormask[4]) >> bitshift[4] << bitshift2[4];
*(pp++) = (buf & colormask[5]) >> bitshift[5] << bitshift2[5];
}
if (w & 1) { /* padded to 2 pix */
buf = getint(fp);
*(pp++) = (buf & colormask[0]) >> bitshift[0];
*(pp++) = (buf & colormask[1]) >> bitshift[1];
*(pp++) = (buf & colormask[2]) >> bitshift[2];
}
}
return FERROR(fp)? 1 : 0;
}
/*******************************************/
static int loadBMP24(fp, pic24, w, h, bits) /* also handles 32-bit BI_RGB */
FILE *fp;
byte *pic24;
u_int w,h, bits;
{
int i,j,padb,rv;
byte *pp = pic24 + ((h - 1) * w * 3);
size_t l = w*h*3;
rv = 0;
padb = (4 - ((w*3) % 4)) & 0x03; /* # of pad bytes to read at EOscanline */
if (bits==32) padb = 0;
for (i=h-1; i>=0; i--) {
pp = pic24 + (i * w * 3);
if ((i&0x3f)==0) WaitCursor();
for (j=0; j<w && (pp - pic24 <= l); j++) {
pp[2] = getc(fp); /* blue */
pp[1] = getc(fp); /* green */
pp[0] = getc(fp); /* red */
if (bits==32) getc(fp);
pp += 3;
}
for (j=0; j<padb; j++) getc(fp);
rv = (FERROR(fp));
if (rv) break;
}
return rv;
}
/*******************************************/
static int loadBMP32(fp, pic24, w, h, colormask) /* 32-bit BI_BITFIELDS only */
FILE *fp;
byte *pic24;
u_int w, h, *colormask;
{
int x, y;
byte *pp;
u_int buf;
int i, bit, bitshift[3], colorbits[3], bitshift2[3];
for (i = 0; i < 3; ++i) {
buf = colormask[i];
bitshift[i] = 0;
for (bit = 0; bit < 32; ++bit) {
if (buf & 1)
break;
else
++bitshift[i];
buf >>= 1;
}
colorbits[i] = 0;
for (; bit < 32; ++bit) {
if (buf & 1)
++colorbits[i];
else
break;
buf >>= 1;
}
if (colorbits[i] > 8) { /* over 8-bit depth */
bitshift[i] += (colorbits[i] - 8);
bitshift2[i] = 0;
} else
bitshift2[i] = 8 - colorbits[i];
}
if (DEBUG > 1)
fprintf(stderr, "loadBMP32: bitfields\n"
"\tR: bits = %2d, mask = %08x, shift >>%2d, <<%2d\n"
"\tG: bits = %2d, mask = %08x, shift >>%2d, <<%2d\n"
"\tB: bits = %2d, mask = %08x, shift >>%2d, <<%2d\n",
colorbits[0], colormask[0], bitshift[0], bitshift2[0],
colorbits[1], colormask[1], bitshift[1], bitshift2[1],
colorbits[2], colormask[2], bitshift[2], bitshift2[2]);
for (y = h-1; y >= 0; y--) {
pp = pic24 + (3 * w * y);
if ((y&0x3f)==0) WaitCursor();
for(x = w; x > 0; x --) {
buf = getint(fp);
*(pp++) = (buf & colormask[0]) >> bitshift[0] << bitshift2[0];
*(pp++) = (buf & colormask[1]) >> bitshift[1] << bitshift2[1];
*(pp++) = (buf & colormask[2]) >> bitshift[2] << bitshift2[2];
}
}
return FERROR(fp)? 1 : 0;
}
/*******************************************/
static u_int getshort(fp)
FILE *fp;
{
int c, c1;
c = getc(fp); c1 = getc(fp);
return ((u_int) c) + (((u_int) c1) << 8);
}
/*******************************************/
static u_int getint(fp)
FILE *fp;
{
int c, c1, c2, c3;
c = getc(fp); c1 = getc(fp); c2 = getc(fp); c3 = getc(fp);
return ((u_int) c) +
(((u_int) c1) << 8) +
(((u_int) c2) << 16) +
(((u_int) c3) << 24);
}
/*******************************************/
static void putshort(fp, i)
FILE *fp;
int i;
{
int c, c1;
c = ((u_int) i) & 0xff; c1 = (((u_int) i)>>8) & 0xff;
putc(c, fp); putc(c1,fp);
}
/*******************************************/
static void putint(fp, i)
FILE *fp;
int i;
{
int c, c1, c2, c3;
c = ((u_int) i) & 0xff;
c1 = (((u_int) i)>>8) & 0xff;
c2 = (((u_int) i)>>16) & 0xff;
c3 = (((u_int) i)>>24) & 0xff;
putc(c, fp); putc(c1,fp); putc(c2,fp); putc(c3,fp);
}
static byte pc2nc[256],r1[256],g1[256],b1[256];
/*******************************************/
int WriteBMP(fp,pic824,ptype,w,h,rmap,gmap,bmap,numcols,colorstyle)
FILE *fp;
byte *pic824;
int ptype,w,h;
byte *rmap, *gmap, *bmap;
int numcols, colorstyle;
{
/*
* if PIC8, and colorstyle == F_FULLCOLOR, F_GREYSCALE, or F_REDUCED,
* the program writes an uncompressed 4- or 8-bit image (depending on
* the value of numcols)
*
* if PIC24, and colorstyle == F_FULLCOLOR, program writes an uncompressed
* 24-bit image
* if PIC24 and colorstyle = F_GREYSCALE, program writes an uncompressed
* 8-bit image
* note that PIC24 and F_BWDITHER/F_REDUCED won't happen
*
* if colorstyle == F_BWDITHER, it writes a 1-bit image
*
*/
int i,j, nc, nbits, bperlin, cmaplen, npixels;
byte *graypic, *sp, *dp, graymap[256];
nc = nbits = cmaplen = 0;
graypic = NULL;
if (ptype == PIC24 && colorstyle == F_GREYSCALE) {
/* generate a faked 8-bit per pixel image with a grayscale cmap,
so that it can just fall through existing 8-bit code */
npixels = w * h;
if (w <= 0 || h <= 0 || npixels/w != h) {
SetISTR(ISTR_WARNING, "image dimensions too large");
return -1;
}
graypic = (byte *) malloc((size_t) npixels);
if (!graypic) FatalError("unable to malloc in WriteBMP()");
for (i=0,sp=pic824,dp=graypic; i<npixels; i++,sp+=3, dp++) {
*dp = MONO(sp[0],sp[1],sp[2]);
}
for (i=0; i<256; i++) graymap[i] = i;
rmap = gmap = bmap = graymap;
numcols = 256;
ptype = PIC8;
pic824 = graypic;
}
if (ptype == PIC24) { /* is F_FULLCOLOR */
nbits = 24;
cmaplen = 0;
nc = 0;
}
else if (ptype == PIC8) {
/* we may have duplicate colors in the colormap, and we'd prefer not to.
* build r1,g1,b1 (a contiguous, minimum set colormap), and pc2nc[], a
* array that maps 'pic8' values (0-numcols) into corresponding values
* in the r1,g1,b1 colormaps (0-nc)
*/
for (i=0; i<256; i++) { pc2nc[i] = r1[i] = g1[i] = b1[i] = 0; }
nc = 0;
for (i=0; i<numcols; i++) {
/* see if color #i is a duplicate */
for (j=0; j<i; j++) {
if (rmap[i] == rmap[j] && gmap[i] == gmap[j] &&
bmap[i] == bmap[j]) break;
}
if (j==i) { /* wasn't found */
pc2nc[i] = nc;
r1[nc] = rmap[i];
g1[nc] = gmap[i];
b1[nc] = bmap[i];
nc++;
}
else pc2nc[i] = pc2nc[j];
}
/* determine how many bits per pixel we'll be writing */
if (colorstyle == F_BWDITHER || nc <= 2) nbits = 1;
else if (nc<=16) nbits = 4;
else nbits = 8;
cmaplen = 1<<nbits; /* # of entries in cmap */
}
bperlin = ((w * nbits + 31) / 32) * 4; /* # bytes written per line */
putc('B', fp); putc('M', fp); /* BMP file magic number */
/* compute filesize and write it */
i = 14 + /* size of bitmap file header */
40 + /* size of bitmap info header */
(nc * 4) + /* size of colormap */
bperlin * h; /* size of image data */
putint(fp, i);
putshort(fp, 0); /* reserved1 */
putshort(fp, 0); /* reserved2 */
putint(fp, 14 + 40 + (nc * 4)); /* offset from BOfile to BObitmap */
putint(fp, 40); /* biSize: size of bitmap info header */
putint(fp, w); /* biWidth */
putint(fp, h); /* biHeight */
putshort(fp, 1); /* biPlanes: must be '1' */
putshort(fp, nbits); /* biBitCount: 1,4,8, or 24 */
putint(fp, BI_RGB); /* biCompression: BI_RGB, BI_RLE8 or BI_RLE4 */
putint(fp, bperlin*h); /* biSizeImage: size of raw image data */
putint(fp, 75 * 39); /* biXPelsPerMeter: (75dpi * 39" per meter) */
putint(fp, 75 * 39); /* biYPelsPerMeter: (75dpi * 39" per meter) */
putint(fp, nc); /* biClrUsed: # of colors used in cmap */
putint(fp, nc); /* biClrImportant: same as above */
/* write out the colormap */
for (i=0; i<nc; i++) {
if (colorstyle == F_GREYSCALE) {
j = MONO(r1[i],g1[i],b1[i]);
putc(j,fp); putc(j,fp); putc(j,fp); putc(0,fp);
}
else {
putc(b1[i],fp);
putc(g1[i],fp);
putc(r1[i],fp);
putc(0,fp);
}
}
/* write out the image */
if (nbits == 1) writeBMP1 (fp, pic824, w, h);
else if (nbits == 4) writeBMP4 (fp, pic824, w, h);
else if (nbits == 8) writeBMP8 (fp, pic824, w, h);
else if (nbits == 24) writeBMP24(fp, pic824, w, h);
if (graypic) free(graypic);
#ifndef VMS
if (FERROR(fp)) return -1;
#else
if (!FERROR(fp)) return -1;
#endif
return 0;
}
/*******************************************/
static void writeBMP1(fp, pic8, w, h)
FILE *fp;
byte *pic8;
int w,h;
{
int i,j,c,bitnum,padw;
byte *pp;
padw = ((w + 31)/32) * 32; /* 'w', padded to be a multiple of 32 */
for (i=h-1; i>=0; i--) {
pp = pic8 + (i * w);
if ((i&0x3f)==0) WaitCursor();
for (j=bitnum=c=0; j<=padw; j++,bitnum++) {
if (bitnum == 8) { /* write the next byte */
putc(c,fp);
bitnum = c = 0;
}
c <<= 1;
if (j<w) {
c |= (pc2nc[*pp++] & 0x01);
}
}
}
}
/*******************************************/
static void writeBMP4(fp, pic8, w, h)
FILE *fp;
byte *pic8;
int w,h;
{
int i,j,c,nybnum,padw;
byte *pp;
padw = ((w + 7)/8) * 8; /* 'w' padded to a multiple of 8pix (32 bits) */
for (i=h-1; i>=0; i--) {