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 void RBevelImage(RImage * image, int bevel_type)
  30 {
  31         RColor color;
  32         RColor cdelta;
  33         int w, h;
  34
  35         if (image->width < 3 || image->height < 3)
  36                 return;
  37
  38         w = image->width;
  39         h = image->height;
  40         if (bevel_type > 0) {   /* raised */
  41                 /* top */
  42                 cdelta.alpha = 0;
  43                 cdelta.red = cdelta.green = cdelta.blue = 80;
  44                 ROperateLine(image, RAddOperation, 0, 0, w - 1, 0, &cdelta);
  45                 if (bevel_type == RBEV_RAISED3 && w > 3)
  46                         ROperateLine(image, RAddOperation, 1, 1, w - 3, 1, &cdelta);
  47
  48                 /* left */
  49                 ROperateLine(image, RAddOperation, 0, 1, 0, h - 1, &cdelta);
  50                 if (bevel_type == RBEV_RAISED3 && h > 3)
  51                         ROperateLine(image, RAddOperation, 1, 2, 1, h - 3, &cdelta);
  52
  53                 /* bottom */
  54                 color.alpha = 255;
  55                 color.red = color.green = color.blue = 0;
  56                 cdelta.red = cdelta.green = cdelta.blue = 40;
  57                 if (bevel_type == RBEV_RAISED2 || bevel_type == RBEV_RAISED3) {
  58                         ROperateLine(image, RSubtractOperation, 0, h - 2, w - 3, h - 2, &cdelta);
  59                         RDrawLine(image, 0, h - 1, w - 1, h - 1, &color);
  60                 } else {
  61                         ROperateLine(image, RSubtractOperation, 0, h - 1, w - 1, h - 1, &cdelta);
  62                 }
  63
  64                 /* right */
  65                 if (bevel_type == RBEV_RAISED2 || bevel_type == RBEV_RAISED3) {
  66                         ROperateLine(image, RSubtractOperation, w - 2, 0, w - 2, h - 2, &cdelta);
  67                         RDrawLine(image, w - 1, 0, w - 1, h - 2, &color);
  68                 } else {
  69                         ROperateLine(image, RSubtractOperation, w - 1, 0, w - 1, h - 2, &cdelta);
  70                 }
  71         } else {                /* sunken */
  72                 cdelta.alpha = 0;
  73                 cdelta.red = cdelta.green = cdelta.blue = 40;
  74                 ROperateLine(image, RSubtractOperation, 0, 0, w - 1, 0, &cdelta);       /* top */
  75                 ROperateLine(image, RSubtractOperation, 0, 1, 0, h - 1, &cdelta);       /* left */
  76                 cdelta.red = cdelta.green = cdelta.blue = 80;
  77                 ROperateLine(image, RAddOperation, 0, h - 1, w - 1, h - 1, &cdelta);    /* bottom */
  78                 ROperateLine(image, RAddOperation, w - 1, 0, w - 1, h - 2, &cdelta);    /* right */
  79         }
  80 }
  81
  82 void RFillImage(RImage * image, RColor * color)
  83 {
  84         unsigned char *d = image->data;
  85         unsigned lineSize;
  86         int i;
  87
  88         if (image->format == RRGBAFormat) {
  89                 for (i = 0; i < image->width; i++) {
  90                         *d++ = color->red;
  91                         *d++ = color->green;
  92                         *d++ = color->blue;
  93                         *d++ = color->alpha;
  94                 }
  95                 lineSize = image->width * 4;
  96                 for (i = 1; i < image->height; i++, d += lineSize) {
  97                         memcpy(d, image->data, lineSize);
  98                 }
  99         } else {
 100                 for (i = 0; i < image->width; i++) {
 101                         *d++ = color->red;
 102                         *d++ = color->green;
 103                         *d++ = color->blue;
 104                 }
 105                 lineSize = image->width * 3;
 106                 for (i = 1; i < image->height; i++, d += lineSize) {
 107                         memcpy(d, image->data, lineSize);
 108                 }
 109         }
 110 }
 111
 112 void RClearImage(RImage * image, RColor * color)
 113 {
 114         unsigned char *d = image->data;
 115         unsigned lineSize;
 116         int i;
 117
 118         if (color->alpha == 255) {
 119                 if (image->format == RRGBAFormat) {
 120                         for (i = 0; i < image->width; i++) {
 121                                 *d++ = color->red;
 122                                 *d++ = color->green;
 123                                 *d++ = color->blue;
 124                                 *d++ = 0xff;
 125                         }
 126                         lineSize = image->width * 4;
 127                         for (i = 1; i < image->height; i++, d += lineSize) {
 128                                 memcpy(d, image->data, lineSize);
 129                         }
 130                 } else {
 131                         for (i = 0; i < image->width; i++) {
 132                                 *d++ = color->red;
 133                                 *d++ = color->green;
 134                                 *d++ = color->blue;
 135                         }
 136                         lineSize = image->width * 3;
 137                         for (i = 1; i < image->height; i++, d += lineSize) {
 138                                 memcpy(d, image->data, lineSize);
 139                         }
 140                 }
 141         } else {
 142                 int bytes = image->width * image->height;
 143                 int alpha, nalpha, r, g, b, s;
 144
 145                 alpha = color->alpha;
 146                 r = color->red * alpha;
 147                 g = color->green * alpha;
 148                 b = color->blue * alpha;
 149                 nalpha = 255 - alpha;
 150
 151                 s = (image->format == RRGBAFormat) ? 4 : 3;
 152
 153                 for (i = 0; i < bytes; i++, d += s) {
 154                         d[0] = (((int)d[0] * nalpha) + r)/256;
 155                         d[1] = (((int)d[1] * nalpha) + g)/256;
 156                         d[2] = (((int)d[2] * nalpha) + b)/256;
 157                 }
 158         }
 159 }
 160
 161 static __inline__ unsigned char clip(int c)
 162 {
 163         if (c > 255)
 164                 c = 255;
 165         return (unsigned char)c;
 166 }
 167
 168 void RLightImage(RImage *image, RColor *color)
 169 {
 170         unsigned char *d = image->data;
 171         unsigned char *dd;
 172         int alpha, r, g, b, s;
 173
 174         s = (image->format == RRGBAFormat) ? 4 : 3;
 175         dd = d + s*image->width*image->height;
 176
 177         r = color->red;
 178         g = color->green;
 179         b = color->blue;
 180
 181         alpha = color->alpha;
 182
 183         if (r == 0 && g == 0 && b == 0) {
 184                 for (; d < dd; d += s) {
 185                         d[0] = clip(((int)d[0] * alpha)/128);
 186                         d[1] = clip(((int)d[1] * alpha)/128);
 187                         d[2] = clip(((int)d[2] * alpha)/128);
 188                 }
 189         } else {
 190                 for (; d < dd; d += s) {
 191                         d[0] = clip((((int)d[0] * alpha) + r)/128);
 192                         d[1] = clip((((int)d[1] * alpha) + g)/128);
 193                         d[2] = clip((((int)d[2] * alpha) + b)/128);
 194                 }
 195         }
 196 }
 197
 198 const char *RMessageForError(int errorCode)
 199 {
 200         switch (errorCode) {
 201         case RERR_NONE:
 202                 return "no error";
 203
 204         case RERR_OPEN:
 205                 return "could not open file";
 206
 207         case RERR_READ:
 208                 return "error reading from file";
 209
 210         case RERR_WRITE:
 211                 return "error writing to file";
 212
 213         case RERR_NOMEMORY:
 214                 return "out of memory";
 215
 216         case RERR_NOCOLOR:
 217                 return "out of color cells";
 218
 219         case RERR_BADIMAGEFILE:
 220                 return "invalid or corrupted image file";
 221
 222         case RERR_BADFORMAT:
 223                 return "the image format in the file is not supported and can't be loaded";
 224
 225         case RERR_BADINDEX:
 226                 return "image file does not contain requested image index";
 227
 228         case RERR_BADVISUALID:
 229                 return "request for an invalid visual ID";
 230
 231         case RERR_STDCMAPFAIL:
 232                 return "failed to create standard colormap";
 233
 234         case RERR_XERROR:
 235                 return "internal X error";
 236
 237         default:
 238         case RERR_INTERNAL:
 239                 return "internal error";
 240         }
 241 }