Pileus Git - ~andy/gtk/blob - gtk/gtkcssimagesurface.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 "gtkcssimagesurfaceprivate.h"
  23
  24 G_DEFINE_TYPE (GtkCssImageSurface, _gtk_css_image_surface, GTK_TYPE_CSS_IMAGE)
  25
  26 static int
  27 gtk_css_image_surface_get_width (GtkCssImage *image)
  28 {
  29   GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
  30
  31   return cairo_image_surface_get_width (surface->surface);
  32 }
  33
  34 static int
  35 gtk_css_image_surface_get_height (GtkCssImage *image)
  36 {
  37   GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
  38
  39   return cairo_image_surface_get_height (surface->surface);
  40 }
  41
  42 static void
  43 gtk_css_image_surface_draw (GtkCssImage *image,
  44                             cairo_t     *cr,
  45                             double       width,
  46                             double       height)
  47 {
  48   GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
  49
  50   cairo_rectangle (cr, 0, 0, width, height);
  51   cairo_scale (cr,
  52                width / cairo_image_surface_get_width (surface->surface),
  53                height / cairo_image_surface_get_height (surface->surface));
  54   cairo_set_source_surface (cr, surface->surface, 0, 0);
  55   cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
  56   cairo_fill (cr);
  57 }
  58
  59 static cairo_status_t
  60 surface_write (void                *closure,
  61                const unsigned char *data,
  62                unsigned int         length)
  63 {
  64   g_byte_array_append (closure, data, length);
  65
  66   return CAIRO_STATUS_SUCCESS;
  67 }
  68
  69 static void
  70 gtk_css_image_surface_print (GtkCssImage *image,
  71                              GString     *string)
  72 {
  73 #if CAIRO_HAS_PNG_FUNCTIONS
  74   GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
  75   GByteArray *array;
  76   char *base64;
  77
  78   array = g_byte_array_new ();
  79   cairo_surface_write_to_png_stream (surface->surface, surface_write, array);
  80   base64 = g_base64_encode (array->data, array->len);
  81   g_byte_array_free (array, TRUE);
  82
  83   g_string_append (string, "url(\"data:image/png;base64,");
  84   g_string_append (string, base64);
  85   g_string_append (string, "\")");
  86
  87   g_free (base64);
  88 #else
  89   g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
  90 #endif
  91 }
  92
  93 static void
  94 gtk_css_image_surface_dispose (GObject *object)
  95 {
  96   GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (object);
  97
  98   if (surface->surface)
  99     {
 100       cairo_surface_destroy (surface->surface);
 101       surface->surface = NULL;
 102     }
 103
 104   G_OBJECT_CLASS (_gtk_css_image_surface_parent_class)->dispose (object);
 105 }
 106
 107 static void
 108 _gtk_css_image_surface_class_init (GtkCssImageSurfaceClass *klass)
 109 {
 110   GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
 111   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 112
 113   image_class->get_width = gtk_css_image_surface_get_width;
 114   image_class->get_height = gtk_css_image_surface_get_height;
 115   image_class->draw = gtk_css_image_surface_draw;
 116   image_class->print = gtk_css_image_surface_print;
 117
 118   object_class->dispose = gtk_css_image_surface_dispose;
 119 }
 120
 121 static void
 122 _gtk_css_image_surface_init (GtkCssImageSurface *image_surface)
 123 {
 124 }
 125
 126 GtkCssImage *
 127 _gtk_css_image_surface_new (cairo_surface_t *surface)
 128 {
 129   GtkCssImage *image;
 130
 131   g_return_val_if_fail (surface != NULL, NULL);
 132
 133   image = g_object_new (GTK_TYPE_CSS_IMAGE_SURFACE, NULL);
 134
 135   GTK_CSS_IMAGE_SURFACE (image)->surface = cairo_surface_reference (surface);
 136
 137   return image;
 138 }
 139
 140 GtkCssImage *
 141 _gtk_css_image_surface_new_for_pixbuf (GdkPixbuf *pixbuf)
 142 {
 143   GtkCssImage *image;
 144   cairo_surface_t *surface;
 145   cairo_t *cr;
 146
 147   g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
 148
 149   surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 150                                         gdk_pixbuf_get_width (pixbuf),
 151                                         gdk_pixbuf_get_height (pixbuf));
 152   cr = cairo_create (surface);
 153   gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 154   cairo_paint (cr);
 155   cairo_destroy (cr);
 156
 157   image = _gtk_css_image_surface_new (surface);
 158
 159   cairo_surface_destroy (surface);
 160
 161   return image;
 162 }
 163