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, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  *
  18  * Authors: Benjamin Otte <otte@gnome.org>
  19  */
  20
  21 #include "config.h"
  22
  23 #include "gtkcssimageurlprivate.h"
  24
  25 #include "gtkcssprovider.h"
  26
  27 G_DEFINE_TYPE (GtkCssImageUrl, _gtk_css_image_url, GTK_TYPE_CSS_IMAGE)
  28
  29 static int
  30 gtk_css_image_url_get_width (GtkCssImage *image)
  31 {
  32   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  33
  34   return cairo_image_surface_get_width (url->surface);
  35 }
  36
  37 static int
  38 gtk_css_image_url_get_height (GtkCssImage *image)
  39 {
  40   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  41
  42   return cairo_image_surface_get_height (url->surface);
  43 }
  44
  45 static void
  46 gtk_css_image_url_draw (GtkCssImage        *image,
  47                         cairo_t            *cr,
  48                         double              width,
  49                         double              height)
  50 {
  51   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  52
  53   cairo_rectangle (cr, 0, 0, width, height);
  54   cairo_scale (cr,
  55                width / cairo_image_surface_get_width (url->surface),
  56                height / cairo_image_surface_get_height (url->surface));
  57   cairo_set_source_surface (cr, url->surface, 0, 0);
  58   cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
  59   cairo_fill (cr);
  60 }
  61
  62 static gboolean
  63 gtk_css_image_url_parse (GtkCssImage  *image,
  64                          GtkCssParser *parser,
  65                          GFile        *base)
  66 {
  67   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
  68   GdkPixbuf *pixbuf;
  69   GFile *file;
  70   cairo_t *cr;
  71   GError *error = NULL;
  72   GFileInputStream *input;
  73
  74   file = _gtk_css_parser_read_url (parser, base);
  75   if (file == NULL)
  76     return FALSE;
  77
  78   input = g_file_read (file, NULL, &error);
  79   if (input == NULL)
  80     {
  81       _gtk_css_parser_take_error (parser, error);
  82       return FALSE;
  83     }
  84   g_object_unref (file);
  85
  86   pixbuf = gdk_pixbuf_new_from_stream (G_INPUT_STREAM (input), NULL, &error);
  87   g_object_unref (input);
  88
  89   if (pixbuf == NULL)
  90     {
  91       _gtk_css_parser_take_error (parser, error);
  92       return FALSE;
  93     }
  94
  95   url->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
  96                                              gdk_pixbuf_get_width (pixbuf),
  97                                              gdk_pixbuf_get_height (pixbuf));
  98   cr = cairo_create (url->surface);
  99   gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 100   cairo_paint (cr);
 101   cairo_destroy (cr);
 102   g_object_unref (pixbuf);
 103
 104   return TRUE;
 105 }
 106
 107 static cairo_status_t
 108 surface_write (void                *closure,
 109                const unsigned char *data,
 110                unsigned int         length)
 111 {
 112   g_byte_array_append (closure, data, length);
 113
 114   return CAIRO_STATUS_SUCCESS;
 115 }
 116
 117 static void
 118 gtk_css_image_url_print (GtkCssImage *image,
 119                          GString     *string)
 120 {
 121 #if CAIRO_HAS_PNG_FUNCTIONS
 122   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 123   GByteArray *array;
 124   char *base64;
 125
 126   array = g_byte_array_new ();
 127   cairo_surface_write_to_png_stream (url->surface, surface_write, array);
 128   base64 = g_base64_encode (array->data, array->len);
 129   g_byte_array_free (array, TRUE);
 130
 131   g_string_append (string, "url(\"data:image/png;base64,");
 132   g_string_append (string, base64);
 133   g_string_append (string, "\")");
 134
 135   g_free (base64);
 136 #else
 137   g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
 138 #endif
 139 }
 140
 141 static void
 142 gtk_css_image_url_dispose (GObject *object)
 143 {
 144   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (object);
 145
 146   if (url->surface)
 147     {
 148       cairo_surface_destroy (url->surface);
 149       url->surface = NULL;
 150     }
 151
 152   G_OBJECT_CLASS (_gtk_css_image_url_parent_class)->dispose (object);
 153 }
 154
 155 static void
 156 _gtk_css_image_url_class_init (GtkCssImageUrlClass *klass)
 157 {
 158   GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
 159   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 160
 161   image_class->get_width = gtk_css_image_url_get_width;
 162   image_class->get_height = gtk_css_image_url_get_height;
 163   image_class->draw = gtk_css_image_url_draw;
 164   image_class->parse = gtk_css_image_url_parse;
 165   image_class->print = gtk_css_image_url_print;
 166
 167   object_class->dispose = gtk_css_image_url_dispose;
 168 }
 169
 170 static void
 171 _gtk_css_image_url_init (GtkCssImageUrl *image_url)
 172 {
 173 }
 174