wrlib/misc.c

   1 /*
   2  *  Raster graphics library
   3  *
   4  *  Copyright (c) 1997-2000 Alfredo K. Kojima
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Library General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Library General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Library General Public
  17  *  License along with this library; if not, write to the Free
  18  *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <X11/Xlib.h>
  26
  27 #include "wraster.h"
  28
  29
  30 void
  31 RBevelImage(RImage *image, int bevel_type)
  32 {
  33     RColor color;
  34     RColor cdelta;
  35     int w, h;
  36
  37     if (image->width<3 || image->height<3)
  38         return;
  39
  40     w = image->width;
  41     h = image->height;
  42     if (bevel_type>0) {  /* raised */
  43         /* top */
  44         cdelta.alpha = 0;
  45         cdelta.red = cdelta.green = cdelta.blue = 80;
  46         ROperateLine(image, RAddOperation, 0, 0, w-1, 0, &cdelta);
  47         if (bevel_type==RBEV_RAISED3 && w>3)
  48             ROperateLine(image, RAddOperation, 1, 1, w-3, 1,&cdelta);
  49
  50         /* left */
  51         ROperateLine(image, RAddOperation, 0, 1, 0, h-1, &cdelta);
  52         if (bevel_type==RBEV_RAISED3 && h>3)
  53             ROperateLine(image, RAddOperation, 1, 2, 1, h-3, &cdelta);
  54
  55         /* bottom */
  56         color.alpha = 255;
  57         color.red = color.green = color.blue = 0;
  58         cdelta.red = cdelta.green = cdelta.blue = 40;
  59         if (bevel_type==RBEV_RAISED2 || bevel_type==RBEV_RAISED3) {
  60             ROperateLine(image, RSubtractOperation, 0, h-2, w-3,
  61                                    h-2, &cdelta);
  62             RDrawLine(image, 0, h-1, w-1, h-1, &color);
  63         } else {
  64             ROperateLine(image, RSubtractOperation, 0, h-1, w-1, h-1,
  65                                    &cdelta);
  66         }
  67
  68         /* right */
  69         if (bevel_type==RBEV_RAISED2 || bevel_type==RBEV_RAISED3) {
  70             ROperateLine(image, RSubtractOperation, w-2, 0, w-2, h-2,
  71                                    &cdelta);
  72             RDrawLine(image, w-1, 0, w-1, h-2, &color);
  73         } else {
  74             ROperateLine(image, RSubtractOperation, w-1, 0, w-1, h-2,
  75                                    &cdelta);
  76         }
  77     } else { /* sunken */
  78         cdelta.alpha = 0;
  79         cdelta.red = cdelta.green = cdelta.blue = 40;
  80         ROperateLine(image, RSubtractOperation, 0, 0, w-1, 0,
  81                                &cdelta);        /* top */
  82         ROperateLine(image, RSubtractOperation, 0, 1, 0, h-1,
  83                                &cdelta);        /* left */
  84         cdelta.red = cdelta.green = cdelta.blue = 80;
  85         ROperateLine(image, RAddOperation, 0, h-1, w-1, h-1, &cdelta); /* bottom */
  86         ROperateLine(image, RAddOperation, w-1, 0, w-1, h-2, &cdelta); /* right */
  87     }
  88 }
  89
  90
  91 void
  92 RClearImage(RImage *image, RColor *color)
  93 {
  94     if (color->alpha==255) {
  95         if (image->format == RRGBAFormat) {
  96             unsigned char *d = image->data;
  97             int i;
  98
  99             for (i = 0; i < image->width; i++) {
 100                 *d++ = color->red;
 101                 *d++ = color->green;
 102                 *d++ = color->blue;
 103                 *d++ = 0xff;
 104             }
 105             for (i = 1; i < image->height; i++, d += image->width*4) {
 106                 memcpy(d, image->data, image->width*4);
 107             }
 108         } else {
 109             unsigned char *d = image->data;
 110             int i;
 111
 112             for (i = 0; i < image->width; i++) {
 113                 *d++ = color->red;
 114                 *d++ = color->green;
 115                 *d++ = color->blue;
 116             }
 117             for (i = 1; i < image->height; i++, d += image->width*3) {
 118                 memcpy(d, image->data, image->width*3);
 119             }
 120         }
 121     } else {
 122         int bytes = image->width*image->height;
 123         int i;
 124         unsigned char *d;
 125         int alpha, nalpha, r, g, b;
 126
 127         d = image->data;
 128
 129         alpha = color->alpha;
 130         r = color->red * alpha;
 131         g = color->green * alpha;
 132         b = color->blue * alpha;
 133         nalpha = 255 - alpha;
 134
 135         for (i=0; i<bytes; i++) {
 136             *d = (((int)*d * nalpha) + r)/256;
 137             d++;
 138             *d = (((int)*d * nalpha) + g)/256;
 139             d++;
 140             *d = (((int)*d * nalpha) + b)/256;
 141             d++;
 142             if (image->format == RRGBAFormat) {
 143                 d++;
 144             }
 145         }
 146     }
 147 }
 148
 149 const char*
 150 RMessageForError(int errorCode)
 151 {
 152     switch (errorCode) {
 153      case RERR_NONE:
 154         return "no error";
 155
 156      case RERR_OPEN:
 157         return "could not open file";
 158
 159      case RERR_READ:
 160         return "error reading from file";
 161
 162      case RERR_WRITE:
 163         return "error writing to file";
 164
 165      case RERR_NOMEMORY:
 166         return "out of memory";
 167
 168      case RERR_NOCOLOR:
 169         return "out of color cells";
 170
 171      case RERR_BADIMAGEFILE:
 172         return "invalid or corrupted image file";
 173
 174      case RERR_BADFORMAT:
 175         return "the image format in the file is not supported and can't be loaded";
 176
 177      case RERR_BADINDEX:
 178         return "image file does not contain requested image index";
 179
 180      case RERR_BADVISUALID:
 181         return "request for an invalid visual ID";
 182
 183      case RERR_STDCMAPFAIL:
 184         return "failed to create standard colormap";
 185
 186      case RERR_XERROR:
 187         return "internal X error";
 188
 189      default:
 190      case RERR_INTERNAL:
 191         return "internal error";
 192     }
 193 }