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wmaker/wrlib/nxpm.c

640 lines
13 KiB
C
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/* nxpm.c - load "normalized" XPM image
*
* Raster graphics library
*
* Copyright (c) 1997 Alfredo K. Kojima
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
/* AIX requires this to be the first thing in the file. */
#ifdef __GNUC__
# define alloca __builtin_alloca
#else
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
# pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include "wraster.h"
/*
* Restricted support for XPM images.
*
* The images must be in the following "normalized" format:
*
*
* line content
* 1 signature comment
* 2 ignored ( normally "static char *xpm[] = {" )
* 3 "width height color_count chars" where chars is 1 or 2
* 4 color definitions. Only c values with #rrggbb or #rrrrggggbbb
* format OR None
* n data
*
* - no comments or blank lines are allowed, except for the signature
* - all lines must have at most 256 characters
* - no white spaces allowed at left of each line
*/
#define LINEWIDTH 64
#ifndef USE_XPM
RImage*
RGetImageFromXPMData(RContext *context, char **data)
{
RImage *image = NULL;
unsigned char *color_table[4];
unsigned short *symbol_table;
unsigned char *r, *g, *b, *a;
int i, j, k, line = 0;
int transp;
unsigned short color;
int bsize;
int w, h, ccount, csize;
if (sscanf(data[line++], "%i %i %i %i", &w, &h, &ccount, &csize)!=4
|| w <= 0 || h <= 0 || ccount <= 0 || csize <= 0)
goto bad_format;
if (csize!=1 && csize!=2)
goto bad_format;
color_table[0] = alloca(ccount);
color_table[1] = alloca(ccount);
color_table[2] = alloca(ccount);
color_table[3] = alloca(ccount);
symbol_table = alloca(ccount * sizeof(unsigned short));
bsize = csize * w + 16;
if (!color_table[0] || !color_table[1] || !color_table[2] ||
!color_table[3] || !symbol_table || !bsize) {
RErrorCode = RERR_NOMEMORY;
alloca(0);
return NULL;
}
transp = 0;
/* get color table */
for (i=0; i<ccount; i++) {
symbol_table[i] = data[line][0];
if (csize==2)
symbol_table[i] |= data[line][1]<<8;
j = csize;
while (data[line][j]!='#' && data[line][j]!=0
&& data[line][j]!='N') j++;
if (data[line][j]=='#') {
unsigned int red, green, blue;
k = 0;
j++;
while (data[line][j+k]!=0) k++;
if (k==6) {
if (sscanf(&(data[line][j]), "%2x%2x%2x", &red, &green, &blue)!=3)
goto bad_format;
} else if (k==12) {
if (sscanf(&(data[line][j]), "%4x%4x%4x", &red, &green, &blue)!=3)
goto bad_format;
red >>= 8;
green >>= 8;
blue >>= 8;
} else
goto bad_format;
color_table[0][i] = red;
color_table[1][i] = green;
color_table[2][i] = blue;
color_table[3][i] = 255;
} else if (strncmp(&(data[line][j]), "None", 4)==0) {
color_table[3][i] = 0;
transp = 1;
} else {
goto bad_format;
}
line++;
}
image = RCreateImage(w, h, transp);
if (!image) {
alloca(0);
return NULL;
}
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
for (i=0; i<h; i++) {
if (csize==1) {
for (j=0; j<w; j++) {
color = data[line][j];
for (k=0; k<ccount; k++) {
if (symbol_table[k] == color)
break;
}
if (k==ccount)
k = 0;
*(r++) = color_table[0][k];
*(g++) = color_table[1][k];
*(b++) = color_table[2][k];
if (a)
*(a++) = color_table[3][k];
}
} else {
for (j=0; j<w*2; j++) {
color = data[line][j++];
color |= data[line][j];
for (k=0; k<ccount; k++) {
if (symbol_table[k] == color)
break;
}
if (k==ccount)
k = 0;
*(r++) = color_table[0][k];
*(g++) = color_table[1][k];
*(b++) = color_table[2][k];
if (a)
*(a++) = color_table[3][k];
}
}
line++;
}
#ifdef C_ALLOCA
alloca(0);
#endif
return image;
bad_format:
RErrorCode = RERR_BADIMAGEFILE;
#ifdef C_ALLOCA
alloca(0);
#endif
if (image)
RDestroyImage(image);
return NULL;
}
RImage*
RLoadXPM(RContext *context, char *file, int index)
{
RImage *image = NULL;
char line[LINEWIDTH+1];
char *buffer;
unsigned char *color_table[4];
unsigned short *symbol_table;
unsigned char *r, *g, *b, *a;
int i, j, k;
int transp;
unsigned short color;
int bsize;
int w, h, ccount, csize;
FILE *f;
f = fopen(file, "r");
if (!f) {
RErrorCode = RERR_OPEN;
return NULL;
}
/* sig */
if (!fgets(line, LINEWIDTH, f))
goto bad_file;
/* declaration */
if (!fgets(line, LINEWIDTH, f))
goto bad_file;
/* data */
if (!fgets(line, LINEWIDTH, f))
goto bad_file;
if (line[0]=='/')
if (!fgets(line, LINEWIDTH, f))
goto bad_file;
if (sscanf(line, "\"%i %i %i %i\"", &w, &h, &ccount, &csize)!=4
|| w <= 0 || h <= 0 || ccount <= 0 || csize <= 0)
goto bad_file;
if (csize!=1 && csize!=2)
goto bad_format;
color_table[0] = alloca(ccount);
color_table[1] = alloca(ccount);
color_table[2] = alloca(ccount);
color_table[3] = alloca(ccount);
symbol_table = alloca(ccount * sizeof(unsigned short));
bsize = csize * w + 16;
buffer = alloca(bsize);
if (!color_table[0] || !color_table[1] || !color_table[2] ||
!color_table[3] || !symbol_table || !bsize) {
RErrorCode = RERR_NOMEMORY;
fclose(f);
alloca(0);
return NULL;
}
transp = 0;
/* get color table */
for (i=0; i<ccount; i++) {
if (!fgets(line, LINEWIDTH, f))
goto bad_file;
if (line[0]=='/')
if (!fgets(line, LINEWIDTH, f))
goto bad_file;
symbol_table[i] = line[1];
if (csize==2)
symbol_table[i] |= line[2]<<8;
j = csize+1;
while (line[j]!='#' && line[j]!='"' && line[j]!=0 && line[j]!='N') j++;
if (line[j]=='#') {
unsigned int red, green, blue;
k = 0;
j++;
while (line[j+k]!='"' && line[j+k]!=0) k++;
if (k==6) {
if (sscanf(&(line[j]), "%2x%2x%2x", &red, &green, &blue)!=3)
goto bad_format;
} else if (k==12) {
if (sscanf(&(line[j]), "%4x%4x%4x", &red, &green, &blue)!=3)
goto bad_format;
red >>= 8;
green >>= 8;
blue >>= 8;
} else
goto bad_format;
color_table[0][i] = red;
color_table[1][i] = green;
color_table[2][i] = blue;
color_table[3][i] = 255;
} else if (strncmp(&(line[j]), "None", 4)==0) {
color_table[3][i] = 0;
transp = 1;
} else {
goto bad_format;
}
}
image = RCreateImage(w, h, transp);
if (!image) {
fclose(f);
alloca(0);
return NULL;
}
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
for (i=0; i<h; i++) {
if (!fgets(buffer, bsize, f))
goto bad_file;
if (buffer[0]=='/')
if (!fgets(buffer, bsize, f))
goto bad_file;
if (csize==1) {
for (j=1; j<=w; j++) {
color = buffer[j];
for (k=0; k<ccount; k++) {
if (symbol_table[k] == color)
break;
}
if (k==ccount)
k = 0;
*(r++) = color_table[0][k];
*(g++) = color_table[1][k];
*(b++) = color_table[2][k];
if (a)
*(a++) = color_table[3][k];
}
} else {
for (j=1; j<=w*2; j++) {
color = buffer[j++];
color |= buffer[j] << 8;
for (k=0; k<ccount; k++) {
if (symbol_table[k] == color)
break;
}
if (k==ccount) {
k = 0;
}
*(r++) = color_table[0][k];
*(g++) = color_table[1][k];
*(b++) = color_table[2][k];
if (a)
*(a++) = color_table[3][k];
}
}
}
fclose(f);
#ifdef C_ALLOCA
alloca(0);
#endif
return image;
bad_format:
RErrorCode = RERR_BADIMAGEFILE;
fclose(f);
#ifdef C_ALLOCA
alloca(0);
#endif
if (image)
RDestroyImage(image);
return NULL;
bad_file:
RErrorCode = RERR_BADIMAGEFILE;
fclose(f);
#ifdef C_ALLOCA
alloca(0);
#endif
if (image)
RDestroyImage(image);
return NULL;
}
#endif
typedef struct XPMColor {
unsigned char red;
unsigned char green;
unsigned char blue;
int index;
struct XPMColor *next;
} XPMColor;
#define I2CHAR(i) ((i)<12 ? (i)+'0' : ((i)<38 ? (i)+'A'-12 : (i)+'a'-38))
#define CINDEX(xpmc) (((unsigned)(xpmc)->red)<<16|((unsigned)(xpmc)->green)<<8|((unsigned)(xpmc)->blue))
static XPMColor*
lookfor(XPMColor *list, int index)
{
if (!list)
return NULL;
for (; list!=NULL; list=list->next) {
if (CINDEX(list) == index)
return list;
}
return NULL;
}
/*
* Looks for the color in the colormap and inserts if it is not found.
*
* list is a binary search list. The unbalancing problem is just ignored.
*
* Returns False on error
*/
static Bool
addcolor(XPMColor **list, unsigned r, unsigned g, unsigned b, int *colors)
{
XPMColor *tmpc;
XPMColor *newc;
int index;
index = r<<16|g<<8|b;
tmpc = *list;
tmpc = lookfor(*list, index);
if (tmpc)
return True;
newc = malloc(sizeof(XPMColor));
if (!newc) {
RErrorCode = RERR_NOMEMORY;
return False;
}
newc->red = r;
newc->green = g;
newc->blue = b;
newc->next = *list;
*list = newc;
(*colors)++;
return True;
}
static char*
index2str(char *buffer, int index, int charsPerPixel)
{
int i;
for (i=0; i<charsPerPixel; i++) {
buffer[i] = I2CHAR(index&63);
index >>= 6;
}
buffer[i] = 0;
return buffer;
}
static void
outputcolormap(FILE *file, XPMColor *colormap, int charsPerPixel)
{
int index;
char buf[128];
if (!colormap)
return;
for (index=0; colormap!=NULL; colormap=colormap->next,index++) {
colormap->index = index;
fprintf(file, "\"%s c #%02x%02x%02x\",\n",
index2str(buf, index, charsPerPixel), colormap->red,
colormap->green, colormap->blue);
}
}
static void
freecolormap(XPMColor *colormap)
{
XPMColor *tmp;
while (colormap) {
tmp = colormap->next;
free(colormap);
colormap = tmp;
}
}
/* save routine is common to internal support and library support */
Bool
RSaveXPM(RImage *image, char *filename)
{
FILE *file;
int x, y;
int colorCount=0;
int charsPerPixel;
XPMColor *colormap = NULL;
XPMColor *tmpc;
int i;
int ok = 0;
unsigned char *r, *g, *b, *a;
char transp[16];
char buf[128];
file = fopen(filename, "w+");
if (!file) {
RErrorCode = RERR_OPEN;
return False;
}
fprintf(file, "/* XPM */\n");
fprintf(file, "static char *image[] = {\n");
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
/* first pass: make colormap for the image */
if (a)
colorCount = 1;
for (y = 0; y < image->height; y++) {
for (x = 0; x < image->width; x++) {
if (!a || *a++>127)
if (!addcolor(&colormap, *r, *g, *b, &colorCount)) {
goto uhoh;
}
r++; g++; b++;
}
}
charsPerPixel = 1;
while ((1 << charsPerPixel*6) < colorCount)
charsPerPixel++;
/* write header info */
fprintf(file, "\"%i %i %i %i\",\n", image->width, image->height,
colorCount, charsPerPixel);
/* write colormap data */
if (image->data[3]) {
for (i=0; i<charsPerPixel; i++)
transp[i] = ' ';
transp[i] = 0;
fprintf(file, "\"%s c None\",\n", transp);
}
i = 0;
outputcolormap(file, colormap, charsPerPixel);
r = image->data[0];
g = image->data[1];
b = image->data[2];
a = image->data[3];
/* write data */
for (y = 0; y < image->height; y++) {
fprintf(file, "\"");
for (x = 0; x < image->width; x++) {
if (!a || *a++>127) {
tmpc = lookfor(colormap, (unsigned)*r<<16|(unsigned)*g<<8|(unsigned)*b);
fprintf(file, index2str(buf, tmpc->index, charsPerPixel));
} else {
fprintf(file, transp);
}
r++; g++; b++;
}
if (y < image->height-1)
fprintf(file, "\",\n");
else
fprintf(file, "\"};\n");
}
ok = 1;
uhoh:
errno = 0;
fclose(file);
if (ok && errno==ENOSPC) {
RErrorCode = RERR_WRITE;
}
freecolormap(colormap);
return ok ? True : False;
}
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