wrlib/misc.c

   1 /*
   2  *  Raster graphics library
   3  *
   4  *  Copyright (c) 1997 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
  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
  31 int
  32 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 False;
  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,
  62                                    h-2, &cdelta);
  63             RDrawLine(image, 0, h-1, w-1, h-1, &color);
  64         } else {
  65             ROperateLine(image, RSubtractOperation, 0, h-1, w-1, h-1,
  66                                    &cdelta);
  67         }
  68
  69         /* right */
  70         if (bevel_type==RBEV_RAISED2 || bevel_type==RBEV_RAISED3) {
  71             ROperateLine(image, RSubtractOperation, w-2, 0, w-2, h-2,
  72                                    &cdelta);
  73             RDrawLine(image, w-1, 0, w-1, h-2, &color);
  74         } else {
  75             ROperateLine(image, RSubtractOperation, w-1, 0, w-1, h-2,
  76                                    &cdelta);
  77         }
  78     } else { /* sunken */
  79         cdelta.alpha = 0;
  80         cdelta.red = cdelta.green = cdelta.blue = 40;
  81         ROperateLine(image, RSubtractOperation, 0, 0, w-1, 0,
  82                                &cdelta);        /* top */
  83         ROperateLine(image, RSubtractOperation, 0, 1, 0, h-1,
  84                                &cdelta);        /* left */
  85         cdelta.red = cdelta.green = cdelta.blue = 80;
  86         ROperateLine(image, RAddOperation, 0, h-1, w-1, h-1, &cdelta); /* bottom */
  87         ROperateLine(image, RAddOperation, w-1, 0, w-1, h-2, &cdelta); /* right */
  88     }
  89     return True;
  90 }
  91
  92
  93 int
  94 RClearImage(RImage *image, RColor *color)
  95 {
  96     int bytes;
  97
  98     bytes = image->width*image->height;
  99
 100     if (color->alpha==255) {
 101         memset(image->data[0], color->red, bytes);
 102         memset(image->data[1], color->green, bytes);
 103         memset(image->data[2], color->blue, bytes);
 104         if (image->data[3])
 105           memset(image->data[3], 0xff, bytes);
 106     } else {
 107         register int i;
 108         unsigned char *dr, *dg, *db;
 109         int alpha, nalpha, r, g, b;
 110
 111         dr = image->data[0];
 112         dg = image->data[1];
 113         db = image->data[2];
 114
 115         r = color->red;
 116         g = color->green;
 117         b = color->blue;
 118         alpha = color->alpha;
 119         nalpha = 255 - alpha;
 120
 121         for (i=0; i<bytes; i++) {
 122             *dr = (((int)*dr * nalpha) + (r * alpha))/256;
 123             *dg = (((int)*dg * nalpha) + (g * alpha))/256;
 124             *db = (((int)*db * nalpha) + (b * alpha))/256;
 125             dr++;    dg++;    db++;
 126         }
 127     }
 128
 129     return True;
 130 }
 131