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 {
  67   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  68   GdkPixbuf *pixbuf;
  69   cairo_t *cr;
  70   GError *error = NULL;
  71   GFileInputStream *input;
  72
  73   url->file = _gtk_css_parser_read_url (parser);
  74   if (url->file == NULL)
  75     return FALSE;
  76
  77   /* We special case resources here so we can use
  78      gdk_pixbuf_new_from_resource, which in turn has some special casing
  79      for GdkPixdata files to avoid duplicating the memory for the pixbufs */
  80   if (g_file_has_uri_scheme (url->file, "resource"))
  81     {
  82       char *uri = g_file_get_uri (url->file);
  83       char *resource_path = g_uri_unescape_string (uri + strlen ("resource://"), NULL);
  84
  85       pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
  86       g_free (resource_path);
  87       g_free (uri);
  88     }
  89   else
  90     {
  91       input = g_file_read (url->file, NULL, &error);
  92       if (input == NULL)
  93         {
  94           _gtk_css_parser_take_error (parser, error);
  95           return FALSE;
  96         }
  97
  98       pixbuf = gdk_pixbuf_new_from_stream (G_INPUT_STREAM (input), NULL, &error);
  99       g_object_unref (input);
 100     }
 101
 102   if (pixbuf == NULL)
 103     {
 104       _gtk_css_parser_take_error (parser, error);
 105       return FALSE;
 106     }
 107
 108   url->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 109                                              gdk_pixbuf_get_width (pixbuf),
 110                                              gdk_pixbuf_get_height (pixbuf));
 111   cr = cairo_create (url->surface);
 112   gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 113   cairo_paint (cr);
 114   cairo_destroy (cr);
 115   g_object_unref (pixbuf);
 116
 117   return TRUE;
 118 }
 119
 120 static cairo_status_t
 121 surface_write (void                *closure,
 122                const unsigned char *data,
 123                unsigned int         length)
 124 {
 125   g_byte_array_append (closure, data, length);
 126
 127   return CAIRO_STATUS_SUCCESS;
 128 }
 129
 130 static void
 131 gtk_css_image_url_print (GtkCssImage *image,
 132                          GString     *string)
 133 {
 134 #if CAIRO_HAS_PNG_FUNCTIONS
 135   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 136   GByteArray *array;
 137   char *base64;
 138
 139   array = g_byte_array_new ();
 140   cairo_surface_write_to_png_stream (url->surface, surface_write, array);
 141   base64 = g_base64_encode (array->data, array->len);
 142   g_byte_array_free (array, TRUE);
 143
 144   g_string_append (string, "url(\"data:image/png;base64,");
 145   g_string_append (string, base64);
 146   g_string_append (string, "\")");
 147
 148   g_free (base64);
 149 #else
 150   g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
 151 #endif
 152 }
 153
 154 static void
 155 gtk_css_image_url_dispose (GObject *object)
 156 {
 157   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (object);
 158
 159   g_clear_object (&url->file);
 160
 161   if (url->surface)
 162     {
 163       cairo_surface_destroy (url->surface);
 164       url->surface = NULL;
 165     }
 166
 167   G_OBJECT_CLASS (_gtk_css_image_url_parent_class)->dispose (object);
 168 }
 169
 170 static void
 171 _gtk_css_image_url_class_init (GtkCssImageUrlClass *klass)
 172 {
 173   GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
 174   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 175
 176   image_class->get_width = gtk_css_image_url_get_width;
 177   image_class->get_height = gtk_css_image_url_get_height;
 178   image_class->draw = gtk_css_image_url_draw;
 179   image_class->parse = gtk_css_image_url_parse;
 180   image_class->print = gtk_css_image_url_print;
 181
 182   object_class->dispose = gtk_css_image_url_dispose;
 183 }
 184
 185 static void
 186 _gtk_css_image_url_init (GtkCssImageUrl *image_url)
 187 {
 188 }
 189