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

   1 /*
   2  * Copyright © 2011 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 2.1 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, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Authors: Benjamin Otte <otte@gnome.org>
  18  */
  19
  20 #include "config.h"
  21
  22 #include <string.h>
  23
  24 #include "gtkcssimageurlprivate.h"
  25
  26 #include "gtkcssprovider.h"
  27
  28 G_DEFINE_TYPE (GtkCssImageUrl, _gtk_css_image_url, GTK_TYPE_CSS_IMAGE)
  29
  30 static int
  31 gtk_css_image_url_get_width (GtkCssImage *image)
  32 {
  33   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  34
  35   return cairo_image_surface_get_width (url->surface);
  36 }
  37
  38 static int
  39 gtk_css_image_url_get_height (GtkCssImage *image)
  40 {
  41   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  42
  43   return cairo_image_surface_get_height (url->surface);
  44 }
  45
  46 static void
  47 gtk_css_image_url_draw (GtkCssImage        *image,
  48                         cairo_t            *cr,
  49                         double              width,
  50                         double              height)
  51 {
  52   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  53
  54   cairo_rectangle (cr, 0, 0, width, height);
  55   cairo_scale (cr,
  56                width / cairo_image_surface_get_width (url->surface),
  57                height / cairo_image_surface_get_height (url->surface));
  58   cairo_set_source_surface (cr, url->surface, 0, 0);
  59   cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
  60   cairo_fill (cr);
  61 }
  62
  63 static gboolean
  64 gtk_css_image_url_parse (GtkCssImage  *image,
  65                          GtkCssParser *parser,
  66                          GFile        *base)
  67 {
  68   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  69   GdkPixbuf *pixbuf;
  70   GFile *file;
  71   cairo_t *cr;
  72   GError *error = NULL;
  73   GFileInputStream *input;
  74
  75   file = _gtk_css_parser_read_url (parser, base);
  76   if (file == NULL)
  77     return FALSE;
  78
  79   /* We special case resources here so we can use
  80      gdk_pixbuf_new_from_resource, which in turn has some special casing
  81      for GdkPixdata files to avoid duplicating the memory for the pixbufs */
  82   if (g_file_has_uri_scheme (file, "resource"))
  83     {
  84       char *uri = g_file_get_uri (file);
  85       char *resource_path = g_uri_unescape_string (uri + strlen ("resource://"), NULL);
  86
  87       pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
  88       g_free (resource_path);
  89       g_free (uri);
  90     }
  91   else
  92     {
  93       input = g_file_read (file, NULL, &error);
  94       if (input == NULL)
  95         {
  96           _gtk_css_parser_take_error (parser, error);
  97           return FALSE;
  98         }
  99
 100       pixbuf = gdk_pixbuf_new_from_stream (G_INPUT_STREAM (input), NULL, &error);
 101       g_object_unref (input);
 102     }
 103   g_object_unref (file);
 104
 105   if (pixbuf == NULL)
 106     {
 107       _gtk_css_parser_take_error (parser, error);
 108       return FALSE;
 109     }
 110
 111   url->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 112                                              gdk_pixbuf_get_width (pixbuf),
 113                                              gdk_pixbuf_get_height (pixbuf));
 114   cr = cairo_create (url->surface);
 115   gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 116   cairo_paint (cr);
 117   cairo_destroy (cr);
 118   g_object_unref (pixbuf);
 119
 120   return TRUE;
 121 }
 122
 123 static cairo_status_t
 124 surface_write (void                *closure,
 125                const unsigned char *data,
 126                unsigned int         length)
 127 {
 128   g_byte_array_append (closure, data, length);
 129
 130   return CAIRO_STATUS_SUCCESS;
 131 }
 132
 133 static void
 134 gtk_css_image_url_print (GtkCssImage *image,
 135                          GString     *string)
 136 {
 137 #if CAIRO_HAS_PNG_FUNCTIONS
 138   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 139   GByteArray *array;
 140   char *base64;
 141
 142   array = g_byte_array_new ();
 143   cairo_surface_write_to_png_stream (url->surface, surface_write, array);
 144   base64 = g_base64_encode (array->data, array->len);
 145   g_byte_array_free (array, TRUE);
 146
 147   g_string_append (string, "url(\"data:image/png;base64,");
 148   g_string_append (string, base64);
 149   g_string_append (string, "\")");
 150
 151   g_free (base64);
 152 #else
 153   g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
 154 #endif
 155 }
 156
 157 static void
 158 gtk_css_image_url_dispose (GObject *object)
 159 {
 160   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (object);
 161
 162   if (url->surface)
 163     {
 164       cairo_surface_destroy (url->surface);
 165       url->surface = NULL;
 166     }
 167
 168   G_OBJECT_CLASS (_gtk_css_image_url_parent_class)->dispose (object);
 169 }
 170
 171 static void
 172 _gtk_css_image_url_class_init (GtkCssImageUrlClass *klass)
 173 {
 174   GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
 175   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 176
 177   image_class->get_width = gtk_css_image_url_get_width;
 178   image_class->get_height = gtk_css_image_url_get_height;
 179   image_class->draw = gtk_css_image_url_draw;
 180   image_class->parse = gtk_css_image_url_parse;
 181   image_class->print = gtk_css_image_url_print;
 182
 183   object_class->dispose = gtk_css_image_url_dispose;
 184 }
 185
 186 static void
 187 _gtk_css_image_url_init (GtkCssImageUrl *image_url)
 188 {
 189 }
 190