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 RFillImage(RImage *image, RColor *color)
  93 {
  94     if (image->format == RRGBAFormat) {
  95             unsigned char *d = image->data;
  96             int i;
  97
  98             for (i = 0; i < image->width; i++) {
  99                 *d++ = color->red;
 100                 *d++ = color->green;
 101                 *d++ = color->blue;
 102                 *d++ = color->alpha;
 103             }
 104             for (i = 1; i < image->height; i++, d += image->width*4) {
 105                 memcpy(d, image->data, image->width*4);
 106             }
 107     } else {
 108             unsigned char *d = image->data;
 109             int i;
 110
 111             for (i = 0; i < image->width; i++) {
 112                 *d++ = color->red;
 113                 *d++ = color->green;
 114                 *d++ = color->blue;
 115             }
 116             for (i = 1; i < image->height; i++, d += image->width*3) {
 117                 memcpy(d, image->data, image->width*3);
 118             }
 119     }
 120 }
 121
 122
 123 void
 124 RClearImage(RImage *image, RColor *color)
 125 {
 126     if (color->alpha==255) {
 127         if (image->format == RRGBAFormat) {
 128             unsigned char *d = image->data;
 129             int i;
 130
 131             for (i = 0; i < image->width; i++) {
 132                 *d++ = color->red;
 133                 *d++ = color->green;
 134                 *d++ = color->blue;
 135                 *d++ = 0xff;
 136             }
 137             for (i = 1; i < image->height; i++, d += image->width*4) {
 138                 memcpy(d, image->data, image->width*4);
 139             }
 140         } else {
 141             unsigned char *d = image->data;
 142             int i;
 143
 144             for (i = 0; i < image->width; i++) {
 145                 *d++ = color->red;
 146                 *d++ = color->green;
 147                 *d++ = color->blue;
 148             }
 149             for (i = 1; i < image->height; i++, d += image->width*3) {
 150                 memcpy(d, image->data, image->width*3);
 151             }
 152         }
 153     } else {
 154         int bytes = image->width*image->height;
 155         int i;
 156         unsigned char *d;
 157         int alpha, nalpha, r, g, b;
 158
 159         d = image->data;
 160
 161         alpha = color->alpha;
 162         r = color->red * alpha;
 163         g = color->green * alpha;
 164         b = color->blue * alpha;
 165         nalpha = 255 - alpha;
 166
 167         for (i=0; i<bytes; i++) {
 168             *d = (((int)*d * nalpha) + r)/256;
 169             d++;
 170             *d = (((int)*d * nalpha) + g)/256;
 171             d++;
 172             *d = (((int)*d * nalpha) + b)/256;
 173             d++;
 174             if (image->format == RRGBAFormat) {
 175                 d++;
 176             }
 177         }
 178     }
 179 }
 180
 181 const char*
 182 RMessageForError(int errorCode)
 183 {
 184     switch (errorCode) {
 185      case RERR_NONE:
 186         return "no error";
 187
 188      case RERR_OPEN:
 189         return "could not open file";
 190
 191      case RERR_READ:
 192         return "error reading from file";
 193
 194      case RERR_WRITE:
 195         return "error writing to file";
 196
 197      case RERR_NOMEMORY:
 198         return "out of memory";
 199
 200      case RERR_NOCOLOR:
 201         return "out of color cells";
 202
 203      case RERR_BADIMAGEFILE:
 204         return "invalid or corrupted image file";
 205
 206      case RERR_BADFORMAT:
 207         return "the image format in the file is not supported and can't be loaded";
 208
 209      case RERR_BADINDEX:
 210         return "image file does not contain requested image index";
 211
 212      case RERR_BADVISUALID:
 213         return "request for an invalid visual ID";
 214
 215      case RERR_STDCMAPFAIL:
 216         return "failed to create standard colormap";
 217
 218      case RERR_XERROR:
 219         return "internal X error";
 220
 221      default:
 222      case RERR_INTERNAL:
 223         return "internal error";
 224     }
 225 }