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Diffstat (limited to 'app/wlib/gtklib/gtkxpm.c')
| -rw-r--r-- | app/wlib/gtklib/gtkxpm.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/app/wlib/gtklib/gtkxpm.c b/app/wlib/gtklib/gtkxpm.c new file mode 100644 index 0000000..022c973 --- /dev/null +++ b/app/wlib/gtklib/gtkxpm.c @@ -0,0 +1,177 @@ +/** \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; +} |