gtk2/gtk/gtkcssimagesurface.c
Benjamin Otte bf130da741 cssimage: Handle 0x0 images
0x0 images can happen when we fail to load an image - or when we
successfully load a 0x0 image.
2015-12-16 01:50:00 +01:00

163 lines
4.4 KiB
C

/*
* Copyright © 2011 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkcssimagesurfaceprivate.h"
G_DEFINE_TYPE (GtkCssImageSurface, _gtk_css_image_surface, GTK_TYPE_CSS_IMAGE)
static int
gtk_css_image_surface_get_width (GtkCssImage *image)
{
GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
return cairo_image_surface_get_width (surface->surface);
}
static int
gtk_css_image_surface_get_height (GtkCssImage *image)
{
GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
return cairo_image_surface_get_height (surface->surface);
}
static void
gtk_css_image_surface_draw (GtkCssImage *image,
cairo_t *cr,
double width,
double height)
{
GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
int image_width, image_height;
image_width = cairo_image_surface_get_width (surface->surface);
image_height = cairo_image_surface_get_height (surface->surface);
if (image_width == 0 || image_height == 0)
return;
cairo_rectangle (cr, 0, 0, width, height);
cairo_scale (cr,
width / image_width,
height / image_height);
cairo_set_source_surface (cr, surface->surface, 0, 0);
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
cairo_fill (cr);
}
static cairo_status_t
surface_write (void *closure,
const unsigned char *data,
unsigned int length)
{
g_byte_array_append (closure, data, length);
return CAIRO_STATUS_SUCCESS;
}
static void
gtk_css_image_surface_print (GtkCssImage *image,
GString *string)
{
#if CAIRO_HAS_PNG_FUNCTIONS
GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
GByteArray *array;
char *base64;
array = g_byte_array_new ();
cairo_surface_write_to_png_stream (surface->surface, surface_write, array);
base64 = g_base64_encode (array->data, array->len);
g_byte_array_free (array, TRUE);
g_string_append (string, "url(\"data:image/png;base64,");
g_string_append (string, base64);
g_string_append (string, "\")");
g_free (base64);
#else
g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
#endif
}
static void
gtk_css_image_surface_dispose (GObject *object)
{
GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (object);
if (surface->surface)
{
cairo_surface_destroy (surface->surface);
surface->surface = NULL;
}
G_OBJECT_CLASS (_gtk_css_image_surface_parent_class)->dispose (object);
}
static void
_gtk_css_image_surface_class_init (GtkCssImageSurfaceClass *klass)
{
GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
image_class->get_width = gtk_css_image_surface_get_width;
image_class->get_height = gtk_css_image_surface_get_height;
image_class->draw = gtk_css_image_surface_draw;
image_class->print = gtk_css_image_surface_print;
object_class->dispose = gtk_css_image_surface_dispose;
}
static void
_gtk_css_image_surface_init (GtkCssImageSurface *image_surface)
{
}
GtkCssImage *
_gtk_css_image_surface_new (cairo_surface_t *surface)
{
GtkCssImage *image;
g_return_val_if_fail (surface != NULL, NULL);
image = g_object_new (GTK_TYPE_CSS_IMAGE_SURFACE, NULL);
GTK_CSS_IMAGE_SURFACE (image)->surface = cairo_surface_reference (surface);
return image;
}
GtkCssImage *
_gtk_css_image_surface_new_for_pixbuf (GdkPixbuf *pixbuf)
{
GtkCssImage *image;
cairo_surface_t *surface;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
surface = gdk_cairo_surface_create_from_pixbuf (pixbuf, 1, NULL);
image = _gtk_css_image_surface_new (surface);
cairo_surface_destroy (surface);
return image;
}