wrlib/load_xpm.c

   1 /* xpm.c - load XPM image from file using libXpm
   2  *
   3  * Raster graphics library
   4  *
   5  * Copyright (c) 1997-2003 Alfredo K. Kojima
   6  * Copyright (c) 2014 Window Maker Team
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Library General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Library General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Library General Public
  19  *  License along with this library; if not, write to the Free
  20  *  Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  21  *  MA 02110-1301, USA.
  22  */
  23
  24 #include <config.h>
  25
  26 #include <X11/Xlib.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <X11/xpm.h>
  31
  32 #include "wraster.h"
  33 #include "imgformat.h"
  34
  35 static RImage *create_rimage_from_xpm(RContext *context, XpmImage xpm)
  36 {
  37         Display *dpy = context->dpy;
  38         Colormap cmap = context->cmap;
  39         RImage *image;
  40         unsigned char *color_table[4];
  41         unsigned char *data;
  42         int i;
  43         int *p;
  44
  45         if (xpm.height < 1 || xpm.width < 1) {
  46                 RErrorCode = RERR_BADIMAGEFILE;
  47                 return NULL;
  48         }
  49
  50         if (xpm.colorTable == NULL) {
  51                 RErrorCode = RERR_BADIMAGEFILE;
  52                 return NULL;
  53         }
  54         image = RCreateImage(xpm.width, xpm.height, True);
  55         if (!image)
  56                 return NULL;
  57
  58         /* make color table */
  59         for (i = 0; i < 4; i++) {
  60                 color_table[i] = malloc(xpm.ncolors * sizeof(unsigned char));
  61                 if (!color_table[i]) {
  62                         for (i = i - 1; i >= 0; i--) {
  63                                 if (color_table[i])
  64                                         free(color_table[i]);
  65                         }
  66                         RReleaseImage(image);
  67                         RErrorCode = RERR_NOMEMORY;
  68                         return NULL;
  69                 }
  70         }
  71
  72         for (i = 0; i < xpm.ncolors; i++) {
  73                 XColor xcolor;
  74                 char *color = NULL;
  75
  76                 if (xpm.colorTable[i].c_color)
  77                         color = xpm.colorTable[i].c_color;
  78                 else if (xpm.colorTable[i].g_color)
  79                         color = xpm.colorTable[i].g_color;
  80                 else if (xpm.colorTable[i].g4_color)
  81                         color = xpm.colorTable[i].g4_color;
  82                 else if (xpm.colorTable[i].m_color)
  83                         color = xpm.colorTable[i].m_color;
  84                 else if (xpm.colorTable[i].symbolic)
  85                         color = xpm.colorTable[i].symbolic;
  86
  87                 if (!color) {
  88                         color_table[0][i] = 0xbe;
  89                         color_table[1][i] = 0xbe;
  90                         color_table[2][i] = 0xbe;
  91                         color_table[3][i] = 0xff;
  92                         continue;
  93                 }
  94
  95                 if (strncmp(color, "None", 4) == 0) {
  96                         color_table[0][i] = 0;
  97                         color_table[1][i] = 0;
  98                         color_table[2][i] = 0;
  99                         color_table[3][i] = 0;
 100                         continue;
 101                 }
 102                 if (XParseColor(dpy, cmap, color, &xcolor)) {
 103                         color_table[0][i] = xcolor.red >> 8;
 104                         color_table[1][i] = xcolor.green >> 8;
 105                         color_table[2][i] = xcolor.blue >> 8;
 106                         color_table[3][i] = 0xff;
 107                 } else {
 108                         color_table[0][i] = 0xbe;
 109                         color_table[1][i] = 0xbe;
 110                         color_table[2][i] = 0xbe;
 111                         color_table[3][i] = 0xff;
 112                 }
 113         }
 114         /* convert pixmap to RImage */
 115         p = (int *)xpm.data;
 116         data = image->data;
 117         for (i = 0; i < xpm.width * xpm.height; i++, p++) {
 118                 *(data++) = color_table[0][*p];
 119                 *(data++) = color_table[1][*p];
 120                 *(data++) = color_table[2][*p];
 121                 *(data++) = color_table[3][*p];
 122         }
 123         for (i = 0; i < 4; i++)
 124                 free(color_table[i]);
 125         return image;
 126 }
 127
 128 static int is_xpm_error(int status)
 129 {
 130         if (status == XpmSuccess)
 131                 return 0;
 132
 133         switch (status) {
 134         case XpmOpenFailed:
 135                 RErrorCode = RERR_OPEN;
 136                 break;
 137         case XpmFileInvalid:
 138                 RErrorCode = RERR_BADIMAGEFILE;
 139                 break;
 140         case XpmNoMemory:
 141                 RErrorCode = RERR_NOMEMORY;
 142                 break;
 143         default:
 144                 RErrorCode = RERR_BADIMAGEFILE;
 145                 break;
 146         }
 147         return 1;
 148 }
 149
 150 RImage *RGetImageFromXPMData(RContext *context, char **xpmData)
 151 {
 152         RImage *image;
 153         XpmImage xpm;
 154         int status;
 155
 156         status = XpmCreateXpmImageFromData(xpmData, &xpm, (XpmInfo *) NULL);
 157         if (is_xpm_error(status))
 158                 return NULL;
 159
 160         image = create_rimage_from_xpm(context, xpm);
 161         XpmFreeXpmImage(&xpm);
 162         return image;
 163 }
 164
 165 RImage *RLoadXPM(RContext *context, const char *file)
 166 {
 167         RImage *image;
 168         XpmImage xpm;
 169         int status;
 170
 171         status = XpmReadFileToXpmImage((char *)file, &xpm, (XpmInfo *) NULL);
 172         if (is_xpm_error(status))
 173                 return NULL;
 174
 175         image = create_rimage_from_xpm(context, xpm);
 176         XpmFreeXpmImage(&xpm);
 177         return image;
 178 }