Pileus Git - ~andy/gtk/blob - gtk/gtkcellrendererpixbuf.c

   1 /* gtkcellrendererpixbuf.c
   2  * Copyright (C) 2000  Red Hat, Inc.,  Jonathan Blandford <jrb@redhat.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 <stdlib.h>
  21 #include "gtkcellrendererpixbuf.h"
  22 #include "gtkintl.h"
  23
  24 static void gtk_cell_renderer_pixbuf_get_property  (GObject                    *object,
  25                                                     guint                       param_id,
  26                                                     GValue                     *value,
  27                                                     GParamSpec                 *pspec,
  28                                                     const gchar                *trailer);
  29 static void gtk_cell_renderer_pixbuf_set_property  (GObject                    *object,
  30                                                     guint                       param_id,
  31                                                     const GValue               *value,
  32                                                     GParamSpec                 *pspec,
  33                                                     const gchar                *trailer);
  34 static void gtk_cell_renderer_pixbuf_init       (GtkCellRendererPixbuf      *celltext);
  35 static void gtk_cell_renderer_pixbuf_class_init (GtkCellRendererPixbufClass *class);
  36 static void gtk_cell_renderer_pixbuf_get_size   (GtkCellRenderer            *cell,
  37                                                  GtkWidget                  *widget,
  38                                                  gint                       *width,
  39                                                  gint                       *height);
  40 static void gtk_cell_renderer_pixbuf_render     (GtkCellRenderer            *cell,
  41                                                  GdkWindow                  *window,
  42                                                  GtkWidget                  *widget,
  43                                                  GdkRectangle               *background_area,
  44                                                  GdkRectangle               *cell_area,
  45                                                  GdkRectangle               *expose_area,
  46                                                  guint                       flags);
  47
  48
  49 enum {
  50         PROP_ZERO,
  51         PROP_PIXBUF
  52 };
  53
  54
  55 GtkType
  56 gtk_cell_renderer_pixbuf_get_type (void)
  57 {
  58         static GtkType cell_pixbuf_type = 0;
  59
  60         if (!cell_pixbuf_type)
  61         {
  62                 static const GTypeInfo cell_pixbuf_info =
  63                 {
  64                         sizeof (GtkCellRendererPixbufClass),
  65                         NULL,           /* base_init */
  66                         NULL,           /* base_finalize */
  67                         (GClassInitFunc) gtk_cell_renderer_pixbuf_class_init,
  68                         NULL,           /* class_finalize */
  69                         NULL,           /* class_data */
  70                         sizeof (GtkCellRendererPixbuf),
  71                         0,              /* n_preallocs */
  72                         (GInstanceInitFunc) gtk_cell_renderer_pixbuf_init,
  73                 };
  74
  75                 cell_pixbuf_type = g_type_register_static (GTK_TYPE_CELL_RENDERER, "GtkCellRendererPixbuf", &cell_pixbuf_info, 0);
  76         }
  77
  78         return cell_pixbuf_type;
  79 }
  80
  81 static void
  82 gtk_cell_renderer_pixbuf_init (GtkCellRendererPixbuf *cellpixbuf)
  83 {
  84 }
  85
  86 static void
  87 gtk_cell_renderer_pixbuf_class_init (GtkCellRendererPixbufClass *class)
  88 {
  89         GObjectClass *object_class = G_OBJECT_CLASS (class);
  90         GtkCellRendererClass *cell_class = GTK_CELL_RENDERER_CLASS (class);
  91
  92         object_class->get_property = gtk_cell_renderer_pixbuf_get_property;
  93         object_class->set_property = gtk_cell_renderer_pixbuf_set_property;
  94
  95         cell_class->get_size = gtk_cell_renderer_pixbuf_get_size;
  96         cell_class->render = gtk_cell_renderer_pixbuf_render;
  97
  98         g_object_class_install_property (object_class,
  99                                          PROP_PIXBUF,
 100                                          g_param_spec_object ("pixbuf",
 101                                                               _("Pixbuf Object"),
 102                                                               _("The pixbuf to render."),
 103                                                               GDK_TYPE_PIXBUF,
 104                                                               G_PARAM_READABLE |
 105                                                               G_PARAM_WRITABLE));
 106 }
 107
 108 static void
 109 gtk_cell_renderer_pixbuf_get_property (GObject        *object,
 110                                        guint           param_id,
 111                                        GValue         *value,
 112                                        GParamSpec     *pspec,
 113                                        const gchar    *trailer)
 114 {
 115   GtkCellRendererPixbuf *cellpixbuf = GTK_CELL_RENDERER_PIXBUF (object);
 116
 117   switch (param_id)
 118     {
 119     case PROP_PIXBUF:
 120       g_value_set_object (value,
 121                           cellpixbuf->pixbuf ? G_OBJECT (cellpixbuf->pixbuf) : NULL);
 122       break;
 123     default:
 124       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 125       break;
 126     }
 127 }
 128
 129
 130 static void
 131 gtk_cell_renderer_pixbuf_set_property (GObject      *object,
 132                                        guint         param_id,
 133                                        const GValue *value,
 134                                        GParamSpec   *pspec,
 135                                        const gchar  *trailer)
 136 {
 137   GdkPixbuf *pixbuf;
 138   GtkCellRendererPixbuf *cellpixbuf = GTK_CELL_RENDERER_PIXBUF (object);
 139
 140   switch (param_id)
 141     {
 142     case PROP_PIXBUF:
 143       pixbuf = (GdkPixbuf*) g_value_get_object (value);
 144       if (pixbuf)
 145         g_object_ref (G_OBJECT (pixbuf));
 146       if (cellpixbuf->pixbuf)
 147         g_object_unref (G_OBJECT (cellpixbuf->pixbuf));
 148       cellpixbuf->pixbuf = pixbuf;
 149       break;
 150     default:
 151       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 152       break;
 153     }
 154 }
 155
 156 GtkCellRenderer *
 157 gtk_cell_renderer_pixbuf_new (void)
 158 {
 159   return GTK_CELL_RENDERER (gtk_type_new (gtk_cell_renderer_pixbuf_get_type ()));
 160 }
 161
 162 static void
 163 gtk_cell_renderer_pixbuf_get_size (GtkCellRenderer *cell,
 164                                    GtkWidget       *widget,
 165                                    gint            *width,
 166                                    gint            *height)
 167 {
 168   GtkCellRendererPixbuf *cellpixbuf = (GtkCellRendererPixbuf *) cell;
 169
 170   if (width)
 171     *width = (gint) GTK_CELL_RENDERER (cellpixbuf)->xpad * 2 +
 172       (cellpixbuf->pixbuf ? gdk_pixbuf_get_width (cellpixbuf->pixbuf) : 0);
 173
 174   if (height)
 175     *height = (gint) GTK_CELL_RENDERER (cellpixbuf)->ypad * 2 +
 176       (cellpixbuf->pixbuf ? gdk_pixbuf_get_height (cellpixbuf->pixbuf) : 0);
 177 }
 178
 179 static void
 180 gtk_cell_renderer_pixbuf_render (GtkCellRenderer    *cell,
 181                                  GdkWindow          *window,
 182                                  GtkWidget          *widget,
 183                                  GdkRectangle       *background_area,
 184                                  GdkRectangle       *cell_area,
 185                                  GdkRectangle       *expose_area,
 186                                  guint               flags)
 187
 188 {
 189   GtkCellRendererPixbuf *cellpixbuf = (GtkCellRendererPixbuf *) cell;
 190   GdkPixbuf *pixbuf;
 191   guchar *pixels;
 192   gint rowstride;
 193   gint real_xoffset;
 194   gint real_yoffset;
 195   GdkRectangle pix_rect;
 196   GdkRectangle draw_rect;
 197
 198   pixbuf = cellpixbuf->pixbuf;
 199
 200   if (!pixbuf)
 201     return;
 202
 203   rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 204   pixels = gdk_pixbuf_get_pixels (pixbuf);
 205
 206   real_xoffset = GTK_CELL_RENDERER (cellpixbuf)->xalign * (cell_area->width - gdk_pixbuf_get_width (pixbuf) - (2 * GTK_CELL_RENDERER (cellpixbuf)->xpad));
 207   real_xoffset = MAX (real_xoffset, 0) + GTK_CELL_RENDERER (cellpixbuf)->xpad;
 208   real_yoffset = GTK_CELL_RENDERER (cellpixbuf)->yalign * (cell_area->height - gdk_pixbuf_get_height (pixbuf) - (2 * GTK_CELL_RENDERER (cellpixbuf)->ypad));
 209   real_yoffset = MAX (real_yoffset, 0) + GTK_CELL_RENDERER (cellpixbuf)->ypad;
 210
 211   pix_rect.x = cell_area->x + real_xoffset;
 212   pix_rect.y = cell_area->y + real_yoffset;
 213   pix_rect.width = gdk_pixbuf_get_width (pixbuf);
 214   pix_rect.height = gdk_pixbuf_get_height (pixbuf);
 215
 216   if (gdk_rectangle_intersect (cell_area, &pix_rect, &draw_rect))
 217     gdk_pixbuf_render_to_drawable_alpha (pixbuf,
 218                                          window,
 219                                          /* pixbuf 0, 0 is at pix_rect.x, pix_rect.y */
 220                                          draw_rect.x - pix_rect.x,
 221                                          draw_rect.y - pix_rect.y,
 222                                          draw_rect.x,
 223                                          draw_rect.y,
 224                                          draw_rect.width,
 225                                          draw_rect.height,
 226                                          GDK_PIXBUF_ALPHA_FULL,
 227                                          0,
 228                                          GDK_RGB_DITHER_NORMAL,
 229                                          0, 0);
 230 }