Pileus Git - ~andy/gtk/blob - gdk/x11/gdkpango-x11.c

   1 /* GDK - The GIMP Drawing Kit
   2  * Copyright (C) 2000 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library 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 GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <config.h>
  21 #include <stdlib.h>
  22
  23 #include "gdkx.h"
  24 #include "gdkdisplay-x11.h"
  25 #include "gdkpango.h"
  26 #include <pango/pangoxft.h>
  27 #include <pango/pangoxft-render.h>
  28 #include "gdkalias.h"
  29
  30 #include <math.h>
  31
  32 typedef struct _GdkX11Renderer      GdkX11Renderer;
  33 typedef struct _GdkX11RendererClass GdkX11RendererClass;
  34
  35 #define GDK_TYPE_X11_RENDERER            (_gdk_x11_renderer_get_type())
  36 #define GDK_X11_RENDERER(object)         (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_X11_RENDERER, GdkX11Renderer))
  37 #define GDK_IS_X11_RENDERER(object)      (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_X11_RENDERER))
  38 #define GDK_X11_RENDERER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_X11_RENDERER, GdkX11RendererClass))
  39 #define GDK_IS_X11_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_X11_RENDERER))
  40 #define GDK_X11_RENDERER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_X11_RENDERER, GdkX11RendererClass))
  41
  42 #define MAX_RENDER_PART  PANGO_RENDER_PART_STRIKETHROUGH
  43
  44 struct _GdkX11Renderer
  45 {
  46   PangoXftRenderer parent_instance;
  47
  48   XRenderPictFormat *mask_format;
  49
  50   GdkDrawable *drawable;
  51   GdkGC *gc;
  52 };
  53
  54 struct _GdkX11RendererClass
  55 {
  56   PangoXftRendererClass parent_class;
  57 };
  58
  59 G_DEFINE_TYPE (GdkX11Renderer, _gdk_x11_renderer, PANGO_TYPE_XFT_RENDERER)
  60
  61 static void
  62 gdk_x11_renderer_finalize (GObject *object)
  63 {
  64   G_OBJECT_CLASS (_gdk_x11_renderer_parent_class)->finalize (object);
  65 }
  66
  67 static void
  68 gdk_x11_renderer_composite_trapezoids (PangoXftRenderer *xftrenderer,
  69                                        PangoRenderPart   part,
  70                                        XTrapezoid       *trapezoids,
  71                                        int               n_trapezoids)
  72 {
  73   /* Because we only use this renderer for "draw_glyphs()" calls, we
  74    * won't hit this code path much. However, it is hit for drawing
  75    * the "unknown glyph" hex squares. We can safely ignore the part,
  76    */
  77   GdkX11Renderer *x11_renderer = GDK_X11_RENDERER (xftrenderer);
  78
  79   _gdk_x11_drawable_draw_xtrapezoids (x11_renderer->drawable,
  80                                       x11_renderer->gc,
  81                                       trapezoids, n_trapezoids);
  82
  83 }
  84
  85 static void
  86 gdk_x11_renderer_composite_glyphs (PangoXftRenderer *xftrenderer,
  87                                    XftFont          *xft_font,
  88                                    XftGlyphSpec     *glyphs,
  89                                    gint              n_glyphs)
  90 {
  91   GdkX11Renderer *x11_renderer = GDK_X11_RENDERER (xftrenderer);
  92
  93   _gdk_x11_drawable_draw_xft_glyphs (x11_renderer->drawable,
  94                                      x11_renderer->gc,
  95                                      xft_font, glyphs, n_glyphs);
  96 }
  97
  98 static void
  99 _gdk_x11_renderer_init (GdkX11Renderer *renderer)
 100 {
 101 }
 102
 103 static void
 104 _gdk_x11_renderer_class_init (GdkX11RendererClass *klass)
 105 {
 106   PangoXftRendererClass *xftrenderer_class = PANGO_XFT_RENDERER_CLASS (klass);
 107   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 108
 109   xftrenderer_class->composite_glyphs = gdk_x11_renderer_composite_glyphs;
 110   xftrenderer_class->composite_trapezoids = gdk_x11_renderer_composite_trapezoids;
 111
 112   object_class->finalize = gdk_x11_renderer_finalize;
 113 }
 114
 115 PangoRenderer *
 116 _gdk_x11_renderer_get (GdkDrawable *drawable,
 117                        GdkGC       *gc)
 118 {
 119   GdkScreen *screen = GDK_DRAWABLE_IMPL_X11 (drawable)->screen;
 120   GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);
 121   GdkX11Renderer *x11_renderer;
 122
 123   if (!screen_x11->renderer)
 124     {
 125       screen_x11->renderer = g_object_new (GDK_TYPE_X11_RENDERER,
 126                                            "display", GDK_SCREEN_XDISPLAY (screen),
 127                                            "screen",  GDK_SCREEN_XNUMBER (screen),
 128                                            NULL);
 129     }
 130
 131   x11_renderer = GDK_X11_RENDERER (screen_x11->renderer);
 132
 133   x11_renderer->drawable = drawable;
 134   x11_renderer->gc = gc;
 135
 136   return screen_x11->renderer;
 137 }
 138
 139 /**
 140  * gdk_pango_context_get_for_screen:
 141  * @screen: the #GdkScreen for which the context is to be created.
 142  *
 143  * Creates a #PangoContext for @screen.
 144  *
 145  * The context must be freed when you're finished with it.
 146  *
 147  * When using GTK+, normally you should use gtk_widget_get_pango_context()
 148  * instead of this function, to get the appropriate context for
 149  * the widget you intend to render text onto.
 150  *
 151  * Return value: a new #PangoContext for @screen
 152  *
 153  * Since: 2.2
 154  **/
 155 PangoContext *
 156 gdk_pango_context_get_for_screen (GdkScreen *screen)
 157 {
 158   PangoContext *context;
 159
 160   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
 161
 162   if (screen->closed)
 163     return NULL;
 164
 165   context = pango_xft_get_context (GDK_SCREEN_XDISPLAY (screen),
 166                                    GDK_SCREEN_X11 (screen)->screen_num);
 167
 168   g_object_set_data (G_OBJECT (context), "gdk-pango-screen", screen);
 169
 170   return context;
 171 }
 172
 173 #define __GDK_PANGO_X11_C__
 174 #include "gdkaliasdef.c"