render/mask.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    mask.c for the Openbox window manager
   4    Copyright (c) 2003-2007   Dana Jansens
   5    Copyright (c) 2003        Derek Foreman
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "render.h"
  21 #include "color.h"
  22 #include "mask.h"
  23
  24 RrPixmapMask *RrPixmapMaskNew(const RrInstance *inst,
  25                               gint w, gint h, const gchar *data)
  26 {
  27     RrPixmapMask *m = g_new(RrPixmapMask, 1);
  28     m->inst = inst;
  29     m->width = w;
  30     m->height = h;
  31     /* round up to nearest byte */
  32     m->data = g_memdup(data, (w + 7) / 8 * h);
  33     m->mask = XCreateBitmapFromData(RrDisplay(inst), RrRootWindow(inst),
  34                                     data, w, h);
  35     return m;
  36 }
  37
  38 void RrPixmapMaskFree(RrPixmapMask *m)
  39 {
  40     if (m) {
  41         XFreePixmap(RrDisplay(m->inst), m->mask);
  42         g_free(m->data);
  43         g_free(m);
  44     }
  45 }
  46
  47 void RrPixmapMaskDraw(Pixmap p, const RrTextureMask *m, const RrRect *area)
  48 {
  49     gint x, y;
  50     if (m->mask == NULL) return; /* no mask given */
  51
  52     /* set the clip region */
  53     x = area->x + (area->width - m->mask->width) / 2;
  54     y = area->y + (area->height - m->mask->height) / 2;
  55
  56     if (x < 0) x = 0;
  57     if (y < 0) y = 0;
  58
  59     XSetClipMask(RrDisplay(m->mask->inst), RrColorGC(m->color), m->mask->mask);
  60     XSetClipOrigin(RrDisplay(m->mask->inst), RrColorGC(m->color), x, y);
  61
  62     /* fill in the clipped region */
  63     XFillRectangle(RrDisplay(m->mask->inst), p, RrColorGC(m->color), x, y,
  64                    x + m->mask->width, y + m->mask->height);
  65
  66     /* unset the clip region */
  67     XSetClipMask(RrDisplay(m->mask->inst), RrColorGC(m->color), None);
  68     XSetClipOrigin(RrDisplay(m->mask->inst), RrColorGC(m->color), 0, 0);
  69 }
  70
  71 RrPixmapMask *RrPixmapMaskCopy(const RrPixmapMask *src)
  72 {
  73     RrPixmapMask *m = g_new(RrPixmapMask, 1);
  74     m->inst = src->inst;
  75     m->width = src->width;
  76     m->height = src->height;
  77     /* round up to nearest byte */
  78     m->data = g_memdup(src->data, (src->width + 7) / 8 * src->height);
  79     m->mask = XCreateBitmapFromData(RrDisplay(m->inst), RrRootWindow(m->inst),
  80                                     m->data, m->width, m->height);
  81     return m;
  82 }