wrlib/misc.c

   1 /*
   2  * Raster graphics library
   3  *
   4  * Copyright (c) 1997-2003 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     unsigned char *d = image->data;
  95     unsigned lineSize;
  96     int i;
  97
  98     if (image->format == RRGBAFormat) {
  99         for (i = 0; i < image->width; i++) {
 100             *d++ = color->red;
 101             *d++ = color->green;
 102             *d++ = color->blue;
 103             *d++ = color->alpha;
 104         }
 105         lineSize = image->width*4;
 106         for (i = 1; i < image->height; i++, d+=lineSize) {
 107             memcpy(d, image->data, lineSize);
 108         }
 109     } else {
 110         for (i = 0; i < image->width; i++) {
 111             *d++ = color->red;
 112             *d++ = color->green;
 113             *d++ = color->blue;
 114         }
 115         lineSize = image->width*3;
 116         for (i = 1; i < image->height; i++, d+=lineSize) {
 117             memcpy(d, image->data, lineSize);
 118         }
 119     }
 120 }
 121
 122
 123 void
 124 RClearImage(RImage *image, RColor *color)
 125 {
 126     unsigned char *d = image->data;
 127     unsigned lineSize;
 128     int i;
 129
 130     if (color->alpha==255) {
 131         if (image->format == RRGBAFormat) {
 132             for (i = 0; i < image->width; i++) {
 133                 *d++ = color->red;
 134                 *d++ = color->green;
 135                 *d++ = color->blue;
 136                 *d++ = 0xff;
 137             }
 138             lineSize = image->width*4;
 139             for (i = 1; i < image->height; i++, d+=lineSize) {
 140                 memcpy(d, image->data, lineSize);
 141             }
 142         } else {
 143             for (i = 0; i < image->width; i++) {
 144                 *d++ = color->red;
 145                 *d++ = color->green;
 146                 *d++ = color->blue;
 147             }
 148             lineSize = image->width*3;
 149             for (i = 1; i < image->height; i++, d+=lineSize) {
 150                 memcpy(d, image->data, lineSize);
 151             }
 152         }
 153     } else {
 154         int bytes = image->width*image->height;
 155         int alpha, nalpha, r, g, b;
 156
 157         alpha = color->alpha;
 158         r = color->red * alpha;
 159         g = color->green * alpha;
 160         b = color->blue * alpha;
 161         nalpha = 255 - alpha;
 162
 163         for (i=0; i<bytes; i++) {
 164             *d = (((int)*d * nalpha) + r)/256; d++;
 165             *d = (((int)*d * nalpha) + g)/256; d++;
 166             *d = (((int)*d * nalpha) + b)/256; d++;
 167             if (image->format == RRGBAFormat) {
 168                 d++;
 169             }
 170         }
 171     }
 172 }
 173
 174 const char*
 175 RMessageForError(int errorCode)
 176 {
 177     switch (errorCode) {
 178     case RERR_NONE:
 179         return "no error";
 180
 181     case RERR_OPEN:
 182         return "could not open file";
 183
 184     case RERR_READ:
 185         return "error reading from file";
 186
 187     case RERR_WRITE:
 188         return "error writing to file";
 189
 190     case RERR_NOMEMORY:
 191         return "out of memory";
 192
 193     case RERR_NOCOLOR:
 194         return "out of color cells";
 195
 196     case RERR_BADIMAGEFILE:
 197         return "invalid or corrupted image file";
 198
 199     case RERR_BADFORMAT:
 200         return "the image format in the file is not supported and can't be loaded";
 201
 202     case RERR_BADINDEX:
 203         return "image file does not contain requested image index";
 204
 205     case RERR_BADVISUALID:
 206         return "request for an invalid visual ID";
 207
 208     case RERR_STDCMAPFAIL:
 209         return "failed to create standard colormap";
 210
 211     case RERR_XERROR:
 212         return "internal X error";
 213
 214     default:
 215     case RERR_INTERNAL:
 216         return "internal error";
 217     }
 218 }
 219