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
  30 void RBevelImage(RImage * image, int bevel_type)
  31 {
  32         RColor color;
  33         RColor cdelta;
  34         int w, h;
  35
  36         if (image->width < 3 || image->height < 3)
  37                 return;
  38
  39         w = image->width;
  40         h = image->height;
  41         if (bevel_type > 0) {   /* raised */
  42                 /* top */
  43                 cdelta.alpha = 0;
  44                 cdelta.red = cdelta.green = cdelta.blue = 80;
  45                 ROperateLine(image, RAddOperation, 0, 0, w - 1, 0, &cdelta);
  46                 if (bevel_type == RBEV_RAISED3 && w > 3)
  47                         ROperateLine(image, RAddOperation, 1, 1, w - 3, 1, &cdelta);
  48
  49                 /* left */
  50                 ROperateLine(image, RAddOperation, 0, 1, 0, h - 1, &cdelta);
  51                 if (bevel_type == RBEV_RAISED3 && h > 3)
  52                         ROperateLine(image, RAddOperation, 1, 2, 1, h - 3, &cdelta);
  53
  54                 /* bottom */
  55                 color.alpha = 255;
  56                 color.red = color.green = color.blue = 0;
  57                 cdelta.red = cdelta.green = cdelta.blue = 40;
  58                 if (bevel_type == RBEV_RAISED2 || bevel_type == RBEV_RAISED3) {
  59                         ROperateLine(image, RSubtractOperation, 0, h - 2, w - 3, h - 2, &cdelta);
  60                         RDrawLine(image, 0, h - 1, w - 1, h - 1, &color);
  61                 } else {
  62                         ROperateLine(image, RSubtractOperation, 0, h - 1, w - 1, h - 1, &cdelta);
  63                 }
  64
  65                 /* right */
  66                 if (bevel_type == RBEV_RAISED2 || bevel_type == RBEV_RAISED3) {
  67                         ROperateLine(image, RSubtractOperation, w - 2, 0, w - 2, h - 2, &cdelta);
  68                         RDrawLine(image, w - 1, 0, w - 1, h - 2, &color);
  69                 } else {
  70                         ROperateLine(image, RSubtractOperation, w - 1, 0, w - 1, h - 2, &cdelta);
  71                 }
  72         } else {                /* sunken */
  73                 cdelta.alpha = 0;
  74                 cdelta.red = cdelta.green = cdelta.blue = 40;
  75                 ROperateLine(image, RSubtractOperation, 0, 0, w - 1, 0, &cdelta);       /* top */
  76                 ROperateLine(image, RSubtractOperation, 0, 1, 0, h - 1, &cdelta);       /* left */
  77                 cdelta.red = cdelta.green = cdelta.blue = 80;
  78                 ROperateLine(image, RAddOperation, 0, h - 1, w - 1, h - 1, &cdelta);    /* bottom */
  79                 ROperateLine(image, RAddOperation, w - 1, 0, w - 1, h - 2, &cdelta);    /* right */
  80         }
  81 }
  82
  83 void RFillImage(RImage * image, const RColor * color)
  84 {
  85         unsigned char *d = image->data;
  86         unsigned lineSize;
  87         int i;
  88
  89         if (image->format == RRGBAFormat) {
  90                 for (i = 0; i < image->width; i++) {
  91                         *d++ = color->red;
  92                         *d++ = color->green;
  93                         *d++ = color->blue;
  94                         *d++ = color->alpha;
  95                 }
  96                 lineSize = image->width * 4;
  97                 for (i = 1; i < image->height; i++, d += lineSize) {
  98                         memcpy(d, image->data, lineSize);
  99                 }
 100         } else {
 101                 for (i = 0; i < image->width; i++) {
 102                         *d++ = color->red;
 103                         *d++ = color->green;
 104                         *d++ = color->blue;
 105                 }
 106                 lineSize = image->width * 3;
 107                 for (i = 1; i < image->height; i++, d += lineSize) {
 108                         memcpy(d, image->data, lineSize);
 109                 }
 110         }
 111 }
 112
 113 void RClearImage(RImage * image, const RColor * color)
 114 {
 115         unsigned char *d = image->data;
 116         unsigned lineSize;
 117         int i;
 118
 119         if (color->alpha == 255) {
 120                 if (image->format == RRGBAFormat) {
 121                         for (i = 0; i < image->width; i++) {
 122                                 *d++ = color->red;
 123                                 *d++ = color->green;
 124                                 *d++ = color->blue;
 125                                 *d++ = 0xff;
 126                         }
 127                         lineSize = image->width * 4;
 128                         for (i = 1; i < image->height; i++, d += lineSize) {
 129                                 memcpy(d, image->data, lineSize);
 130                         }
 131                 } else {
 132                         for (i = 0; i < image->width; i++) {
 133                                 *d++ = color->red;
 134                                 *d++ = color->green;
 135                                 *d++ = color->blue;
 136                         }
 137                         lineSize = image->width * 3;
 138                         for (i = 1; i < image->height; i++, d += lineSize) {
 139                                 memcpy(d, image->data, lineSize);
 140                         }
 141                 }
 142         } else {
 143                 int bytes = image->width * image->height;
 144                 int alpha, nalpha, r, g, b, s;
 145
 146                 alpha = color->alpha;
 147                 r = color->red * alpha;
 148                 g = color->green * alpha;
 149                 b = color->blue * alpha;
 150                 nalpha = 255 - alpha;
 151
 152                 s = (image->format == RRGBAFormat) ? 4 : 3;
 153
 154                 for (i = 0; i < bytes; i++, d += s) {
 155                         d[0] = (((int)d[0] * nalpha) + r)/256;
 156                         d[1] = (((int)d[1] * nalpha) + g)/256;
 157                         d[2] = (((int)d[2] * nalpha) + b)/256;
 158                 }
 159         }
 160 }
 161
 162 static inline unsigned char clip(int c)
 163 {
 164         if (c > 255)
 165                 c = 255;
 166         return (unsigned char)c;
 167 }
 168
 169 void RLightImage(RImage *image, const RColor *color)
 170 {
 171         unsigned char *d = image->data;
 172         unsigned char *dd;
 173         int alpha, r, g, b, s;
 174
 175         s = (image->format == RRGBAFormat) ? 4 : 3;
 176         dd = d + s*image->width*image->height;
 177
 178         r = color->red;
 179         g = color->green;
 180         b = color->blue;
 181
 182         alpha = color->alpha;
 183
 184         if (r == 0 && g == 0 && b == 0) {
 185                 for (; d < dd; d += s) {
 186                         d[0] = clip(((int)d[0] * alpha)/128);
 187                         d[1] = clip(((int)d[1] * alpha)/128);
 188                         d[2] = clip(((int)d[2] * alpha)/128);
 189                 }
 190         } else {
 191                 for (; d < dd; d += s) {
 192                         d[0] = clip((((int)d[0] * alpha) + r)/128);
 193                         d[1] = clip((((int)d[1] * alpha) + g)/128);
 194                         d[2] = clip((((int)d[2] * alpha) + b)/128);
 195                 }
 196         }
 197 }
 198
 199 const char *RMessageForError(int errorCode)
 200 {
 201         switch (errorCode) {
 202         case RERR_NONE:
 203                 return "no error";
 204
 205         case RERR_OPEN:
 206                 return "could not open file";
 207
 208         case RERR_READ:
 209                 return "error reading from file";
 210
 211         case RERR_WRITE:
 212                 return "error writing to file";
 213
 214         case RERR_NOMEMORY:
 215                 return "out of memory";
 216
 217         case RERR_NOCOLOR:
 218                 return "out of color cells";
 219
 220         case RERR_BADIMAGEFILE:
 221                 return "invalid or corrupted image file";
 222
 223         case RERR_BADFORMAT:
 224                 return "the image format in the file is not supported and can't be loaded";
 225
 226         case RERR_BADINDEX:
 227                 return "image file does not contain requested image index";
 228
 229         case RERR_BADVISUALID:
 230                 return "request for an invalid visual ID";
 231
 232         case RERR_STDCMAPFAIL:
 233                 return "failed to create standard colormap";
 234
 235         case RERR_XERROR:
 236                 return "internal X error";
 237
 238         default:
 239         case RERR_INTERNAL:
 240                 return "internal error";
 241         }
 242 }