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/** \file gtkxpm.c
* XPM creation functions
*/
/* XTrackCad - Model Railroad CAD
* Copyright (C) 2015 Martin Fischer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <string.h>
#include <gtk/gtk.h>
#include "gtkint.h"
#include "uthash.h"
struct xpmColTable {
int color; /* color value (rgb) */
char name[ 5 ]; /* corresponding character representation */
UT_hash_handle hh; /* makes this structure hashable */
};
static struct xpmColTable *colTable = NULL;
// must be 64 chars long
static char colVal[] = ".*0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
struct wDraw_t {
WOBJ_COMMON
void * context;
wDrawActionCallBack_p action;
wDrawRedrawCallBack_p redraw;
GdkPixmap * pixmap;
GdkPixmap * pixmapBackup;
double dpi;
GdkGC * gc;
wDrawWidth lineWidth;
wDrawOpts opts;
wPos_t maxW;
wPos_t maxH;
unsigned long lastColor;
wBool_t lastColorInverted;
const char * helpStr;
wPos_t lastX;
wPos_t lastY;
wBool_t delayUpdate;
};
/**
* Export as XPM bitmap file. During creation of the color table, a 4 byte color
* encoding is assumed and a table created accordingly. Once the whole picture has been scanned
* the correct number ist known. When writing to disk only the needed number of bytes per entry
* is written.
* This routine was heavily inspired by on implementation for TK written by Jan Nijtmans.
*
* \param d IN the drawing area ?
* \param fileName IN fully qualified filename for the bitmap file.
* \return TRUE on success, FALSE on error
*/
wBool_t wBitMapWriteFile( wDraw_p d, const char * fileName )
{
GdkImage * image;
gint x, y;
guint32 pixel;
FILE * f;
int cc = 0;
struct xpmColTable *ct, *tmp;
int numChars;
image = gdk_image_get( (GdkWindow*)d->pixmap, 0, 0, d->w, d->h );
if (!image) {
wNoticeEx( NT_ERROR, "WriteBitMap: image_get failed", "Ok", NULL );
return FALSE;
}
f = fopen( fileName, "w" );
if (!f) {
perror( fileName );
return FALSE;
}
fprintf( f, "/* XPM */\n" );
fprintf( f, "static char * xtrkcad_bitmap[] = {\n" );
fprintf( f, "/* width height num_colors chars_per_pixel */\n" );
// count colors used and create the color table in the same pass
for( y = 0; y < d->h;y ++ ) {
for (x = 0; x < d->w; x++ ) {
pixel = gdk_image_get_pixel( image, x, y );
//check whether color is new
HASH_FIND(hh, colTable, &pixel, sizeof( guint32 ), ct);
if( !ct ) {
// not found previously, so add a new color table entry
int i;
int c;
ct = malloc( sizeof( struct xpmColTable ) );
ct->name[ 4 ] = '\0';
for( i = 3, c = cc; i >= 0; i--, c>>=6 ) {
(ct->name)[ i ] = colVal[ c & 0x3F ];
}
ct->color = pixel;
HASH_ADD(hh, colTable, color, sizeof( guint32 ), ct);
cc++;
}
}
}
// calculate how many characters are needed for the color table
numChars = 1;
if( cc > 0x3ffff ) {
numChars = 4;
} else {
if( cc > 0xfff ) {
numChars = 3;
} else {
if( cc > 0x3f ) {
numChars = 2;
}
}
}
// print color table
fprintf( f, "\"%d %d %d %d\"\n", d->w, d->h, cc, numChars );
fprintf( f, "/* colors */\n" );
for( ct = colTable; ct != NULL; ct = ct->hh.next )
fprintf( f, "\"%s c #%6.6x\",\n", (ct->name) + (4 - numChars ), ct->color );
// print the pixels
fprintf( f, "/* pixels */\n" );
for ( y=0; y<d->h; y++ ) {
fprintf( f, "\"" );
for ( x=0; x<d->w; x++ ) {
pixel = gdk_image_get_pixel( image, x, y );
HASH_FIND( hh, colTable, &pixel, sizeof(guint32), ct );
fputs( (ct->name) + (4 - numChars ), f );
}
fprintf( f, "\"%s\n", (y<d->h-1)?",":"" );
}
// delete the hash and free the content
HASH_ITER(hh, colTable, ct, tmp) {
HASH_DEL(colTable,ct);
free(ct);
}
gdk_image_destroy( image );
fprintf( f, "};\n" );
fclose( f );
return TRUE;
}
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