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., 51 Franklin St, Fifth Floor, Boston,
  19  *  MA 02110-1301, USA.
  20  */
  21 #include <config.h>
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <X11/Xlib.h>
  27
  28 #include "wraster.h"
  29 #include "imgformat.h"
  30
  31
  32 void RBevelImage(RImage * image, int bevel_type)
  33 {
  34         RColor color;
  35         RColor cdelta;
  36         int w, h;
  37
  38         if (image->width < 3 || image->height < 3)
  39                 return;
  40
  41         w = image->width;
  42         h = image->height;
  43         if (bevel_type > 0) {   /* raised */
  44                 /* top */
  45                 cdelta.alpha = 0;
  46                 cdelta.red = cdelta.green = cdelta.blue = 80;
  47                 ROperateLine(image, RAddOperation, 0, 0, w - 1, 0, &cdelta);
  48                 if (bevel_type == RBEV_RAISED3 && w > 3)
  49                         ROperateLine(image, RAddOperation, 1, 1, w - 3, 1, &cdelta);
  50
  51                 /* left */
  52                 ROperateLine(image, RAddOperation, 0, 1, 0, h - 1, &cdelta);
  53                 if (bevel_type == RBEV_RAISED3 && h > 3)
  54                         ROperateLine(image, RAddOperation, 1, 2, 1, h - 3, &cdelta);
  55
  56                 /* bottom */
  57                 color.alpha = 255;
  58                 color.red = color.green = color.blue = 0;
  59                 cdelta.red = cdelta.green = cdelta.blue = 40;
  60                 if (bevel_type == RBEV_RAISED2 || bevel_type == RBEV_RAISED3) {
  61                         ROperateLine(image, RSubtractOperation, 0, h - 2, w - 3, 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, &cdelta);
  65                 }
  66
  67                 /* right */
  68                 if (bevel_type == RBEV_RAISED2 || bevel_type == RBEV_RAISED3) {
  69                         ROperateLine(image, RSubtractOperation, w - 2, 0, w - 2, h - 2, &cdelta);
  70                         RDrawLine(image, w - 1, 0, w - 1, h - 2, &color);
  71                 } else {
  72                         ROperateLine(image, RSubtractOperation, w - 1, 0, w - 1, h - 2, &cdelta);
  73                 }
  74         } else {                /* sunken */
  75                 cdelta.alpha = 0;
  76                 cdelta.red = cdelta.green = cdelta.blue = 40;
  77                 ROperateLine(image, RSubtractOperation, 0, 0, w - 1, 0, &cdelta);       /* top */
  78                 ROperateLine(image, RSubtractOperation, 0, 1, 0, h - 1, &cdelta);       /* left */
  79                 cdelta.red = cdelta.green = cdelta.blue = 80;
  80                 ROperateLine(image, RAddOperation, 0, h - 1, w - 1, h - 1, &cdelta);    /* bottom */
  81                 ROperateLine(image, RAddOperation, w - 1, 0, w - 1, h - 2, &cdelta);    /* right */
  82         }
  83 }
  84
  85 void RFillImage(RImage * image, const RColor * color)
  86 {
  87         unsigned char *d = image->data;
  88         unsigned lineSize;
  89         int i;
  90
  91         if (image->format == RRGBAFormat) {
  92                 for (i = 0; i < image->width; i++) {
  93                         *d++ = color->red;
  94                         *d++ = color->green;
  95                         *d++ = color->blue;
  96                         *d++ = color->alpha;
  97                 }
  98                 lineSize = image->width * 4;
  99                 for (i = 1; i < image->height; i++, d += lineSize) {
 100                         memcpy(d, image->data, lineSize);
 101                 }
 102         } else {
 103                 for (i = 0; i < image->width; i++) {
 104                         *d++ = color->red;
 105                         *d++ = color->green;
 106                         *d++ = color->blue;
 107                 }
 108                 lineSize = image->width * 3;
 109                 for (i = 1; i < image->height; i++, d += lineSize) {
 110                         memcpy(d, image->data, lineSize);
 111                 }
 112         }
 113 }
 114
 115 void RClearImage(RImage * image, const RColor * color)
 116 {
 117         unsigned char *d = image->data;
 118         unsigned lineSize;
 119         int i;
 120
 121         if (color->alpha == 255) {
 122                 if (image->format == RRGBAFormat) {
 123                         for (i = 0; i < image->width; i++) {
 124                                 *d++ = color->red;
 125                                 *d++ = color->green;
 126                                 *d++ = color->blue;
 127                                 *d++ = 0xff;
 128                         }
 129                         lineSize = image->width * 4;
 130                         for (i = 1; i < image->height; i++, d += lineSize) {
 131                                 memcpy(d, image->data, lineSize);
 132                         }
 133                 } else {
 134                         for (i = 0; i < image->width; i++) {
 135                                 *d++ = color->red;
 136                                 *d++ = color->green;
 137                                 *d++ = color->blue;
 138                         }
 139                         lineSize = image->width * 3;
 140                         for (i = 1; i < image->height; i++, d += lineSize) {
 141                                 memcpy(d, image->data, lineSize);
 142                         }
 143                 }
 144         } else {
 145                 int bytes = image->width * image->height;
 146                 int alpha, nalpha, r, g, b, s;
 147
 148                 alpha = color->alpha;
 149                 r = color->red * alpha;
 150                 g = color->green * alpha;
 151                 b = color->blue * alpha;
 152                 nalpha = 255 - alpha;
 153
 154                 s = (image->format == RRGBAFormat) ? 4 : 3;
 155
 156                 for (i = 0; i < bytes; i++, d += s) {
 157                         d[0] = (((int)d[0] * nalpha) + r)/256;
 158                         d[1] = (((int)d[1] * nalpha) + g)/256;
 159                         d[2] = (((int)d[2] * nalpha) + b)/256;
 160                 }
 161         }
 162 }
 163
 164 static inline unsigned char clip(int c)
 165 {
 166         if (c > 255)
 167                 c = 255;
 168         return (unsigned char)c;
 169 }
 170
 171 void RLightImage(RImage *image, const RColor *color)
 172 {
 173         unsigned char *d = image->data;
 174         unsigned char *dd;
 175         int alpha, r, g, b, s;
 176
 177         s = (image->format == RRGBAFormat) ? 4 : 3;
 178         dd = d + s*image->width*image->height;
 179
 180         r = color->red;
 181         g = color->green;
 182         b = color->blue;
 183
 184         alpha = color->alpha;
 185
 186         if (r == 0 && g == 0 && b == 0) {
 187                 for (; d < dd; d += s) {
 188                         d[0] = clip(((int)d[0] * alpha)/128);
 189                         d[1] = clip(((int)d[1] * alpha)/128);
 190                         d[2] = clip(((int)d[2] * alpha)/128);
 191                 }
 192         } else {
 193                 for (; d < dd; d += s) {
 194                         d[0] = clip((((int)d[0] * alpha) + r)/128);
 195                         d[1] = clip((((int)d[1] * alpha) + g)/128);
 196                         d[2] = clip((((int)d[2] * alpha) + b)/128);
 197                 }
 198         }
 199 }
 200
 201 const char *RMessageForError(int errorCode)
 202 {
 203         switch (errorCode) {
 204         case RERR_NONE:
 205                 return "no error";
 206
 207         case RERR_OPEN:
 208                 return "could not open file";
 209
 210         case RERR_READ:
 211                 return "error reading from file";
 212
 213         case RERR_WRITE:
 214                 return "error writing to file";
 215
 216         case RERR_NOMEMORY:
 217                 return "out of memory";
 218
 219         case RERR_NOCOLOR:
 220                 return "out of color cells";
 221
 222         case RERR_BADIMAGEFILE:
 223                 return "invalid or corrupted image file";
 224
 225         case RERR_BADFORMAT:
 226                 return "the image format in the file is not supported and can't be loaded";
 227
 228         case RERR_BADINDEX:
 229                 return "image file does not contain requested image index";
 230
 231         case RERR_BADVISUALID:
 232                 return "request for an invalid visual ID";
 233
 234         case RERR_STDCMAPFAIL:
 235                 return "failed to create standard colormap";
 236
 237         case RERR_XERROR:
 238                 return "internal X error";
 239
 240         default:
 241         case RERR_INTERNAL:
 242                 return "internal error";
 243         }
 244 }
 245
 246 /*
 247  * cleaning third-party libs at shutdown
 248  */
 249 void RShutdown(void)
 250 {
 251 #ifdef USE_MAGICK
 252         RReleaseMagick();
 253 #endif
 254         RReleaseCache();
 255 }