lib/render_pixmap.c

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1998 Alexander Larsson
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 /* This renderer is similar to RenderGdk, except that it renders onto
  20  * its own little GdkPixmap, doesn't deal with the DDisplay at all, and
  21  * uses a 1-1 mapping between points and pixels.  It is used for rendering
  22  * arrows and lines onto selectors.  This way, any change in the arrow
  23  * definitions are automatically reflected in the selectors.
  24  */
  25
  26 /*
  27  * 2002-10-06 : Leaved the original comment but removed almost
  28  * anything else. The 'RendererPixmap' now uses the DiaGdkRenderer which
  29  * is the ported to GObject 'RendererGdk'. No more huge code duplication
  30  * but only some renderer parametrization tweaking.                 --hb
  31  */
  32 #include <config.h>
  33
  34 #include <math.h>
  35 #include <stdlib.h>
  36 #include <gdk/gdk.h>
  37
  38 #include "render_pixmap.h"
  39 #include "message.h"
  40 #include "diagdkrenderer.h"
  41
  42 static Rectangle rect;
  43 static real zoom = 1.0;
  44
  45 DiaRenderer *
  46 new_pixmap_renderer(GdkWindow *window, int width, int height)
  47 {
  48   DiaGdkRenderer *renderer;
  49   GdkColor color;
  50
  51   rect.left = 0;
  52   rect.top = 0;
  53   rect.right = width;
  54   rect.bottom = height;
  55
  56   renderer = g_object_new (DIA_TYPE_GDK_RENDERER, NULL);
  57   renderer->transform = dia_transform_new (&rect, &zoom);
  58   renderer->pixmap = gdk_pixmap_new(window, width, height, -1);
  59   renderer->gc = gdk_gc_new(window);
  60
  61   gdk_color_white(gdk_colormap_get_system(), &color);
  62   gdk_gc_set_foreground(renderer->gc, &color);
  63   gdk_draw_rectangle(renderer->pixmap, renderer->gc, 1,
  64                  0, 0, width, height);
  65
  66   return DIA_RENDERER(renderer);
  67 }
  68
  69 void
  70 renderer_pixmap_set_pixmap (DiaRenderer *ren,
  71                             GdkDrawable *drawable,
  72                             int xoffset, int yoffset,
  73                             int width, int height)
  74 {
  75   DiaGdkRenderer *renderer = DIA_GDK_RENDERER (ren);
  76
  77   if (renderer->pixmap != NULL)
  78     gdk_pixmap_unref(renderer->pixmap);
  79
  80   if (renderer->gc != NULL)
  81     gdk_gc_unref(renderer->gc);
  82
  83   gdk_pixmap_ref(drawable);
  84   renderer->pixmap = drawable;
  85   renderer->gc = gdk_gc_new(drawable);
  86
  87   rect.left = -xoffset;
  88   rect.top = -yoffset;
  89   rect.right = width;
  90   rect.bottom = height;
  91 }
  92
  93 GdkPixmap *
  94 renderer_pixmap_get_pixmap (DiaRenderer *ren)
  95 {
  96   DiaGdkRenderer *renderer = DIA_GDK_RENDERER (ren);
  97
  98   return renderer->pixmap;
  99 }