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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set sw=4 sts=4 ts=4 expandtab: */
/*
rsvg-image.c: Image loading and displaying
Copyright (C) 2000 Eazel, Inc.
Copyright (C) 2002, 2003, 2004, 2005 Dom Lachowicz <cinamod@hotmail.com>
Copyright (C) 2003, 2004, 2005 Caleb Moore <c.moore@student.unsw.edu.au>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Authors: Raph Levien <raph@artofcode.com>,
Dom Lachowicz <cinamod@hotmail.com>,
Caleb Moore <c.moore@student.unsw.edu.au>
*/
#include "config.h"
#include "rsvg-image.h"
#include <string.h>
#include <math.h>
#include <errno.h>
#include "rsvg-css.h"
#include "rsvg-io.h"
cairo_surface_t *
rsvg_cairo_surface_new_from_href (const char *href,
const char *base_uri,
GError **error)
{
guint8 *data;
gsize data_len;
GdkPixbufLoader *loader;
GdkPixbuf *pixbuf = NULL;
int res;
cairo_surface_t *surface;
data = _rsvg_io_acquire_data (href, base_uri, &data_len, error);
if (data == NULL)
return NULL;
loader = gdk_pixbuf_loader_new ();
res = gdk_pixbuf_loader_write (loader, data, data_len, error);
g_free (data);
if (!res) {
gdk_pixbuf_loader_close (loader, NULL);
g_object_unref (loader);
return NULL;
}
if (!gdk_pixbuf_loader_close (loader, error)) {
g_object_unref (loader);
return NULL;
}
pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
if (!pixbuf) {
g_object_unref (loader);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load image '%s': reason not known, probably a corrupt image file"),
href);
return NULL;
}
surface = rsvg_cairo_surface_from_pixbuf (pixbuf);
g_object_unref (loader);
return surface;
}
void
rsvg_preserve_aspect_ratio (unsigned int aspect_ratio, double width,
double height, double *w, double *h, double *x, double *y)
{
double neww, newh;
if (aspect_ratio & ~RSVG_ASPECT_RATIO_SLICE) {
neww = *w;
newh = *h;
if ((height * *w > width * *h) == ((aspect_ratio & RSVG_ASPECT_RATIO_SLICE) == 0)) {
neww = width * *h / height;
} else {
newh = height * *w / width;
}
if (aspect_ratio & RSVG_ASPECT_RATIO_XMIN_YMIN ||
aspect_ratio & RSVG_ASPECT_RATIO_XMIN_YMID ||
aspect_ratio & RSVG_ASPECT_RATIO_XMIN_YMAX) {
} else if (aspect_ratio & RSVG_ASPECT_RATIO_XMID_YMIN ||
aspect_ratio & RSVG_ASPECT_RATIO_XMID_YMID ||
aspect_ratio & RSVG_ASPECT_RATIO_XMID_YMAX)
*x -= (neww - *w) / 2;
else
*x -= neww - *w;
if (aspect_ratio & RSVG_ASPECT_RATIO_XMIN_YMIN ||
aspect_ratio & RSVG_ASPECT_RATIO_XMID_YMIN ||
aspect_ratio & RSVG_ASPECT_RATIO_XMAX_YMIN) {
} else if (aspect_ratio & RSVG_ASPECT_RATIO_XMIN_YMID ||
aspect_ratio & RSVG_ASPECT_RATIO_XMID_YMID ||
aspect_ratio & RSVG_ASPECT_RATIO_XMAX_YMID)
*y -= (newh - *h) / 2;
else
*y -= newh - *h;
*w = neww;
*h = newh;
}
}
static void
rsvg_node_image_free (RsvgNode * self)
{
RsvgNodeImage *z = (RsvgNodeImage *) self;
rsvg_state_finalize (z->super.state);
g_free (z->super.state);
z->super.state = NULL;
if (z->surface)
cairo_surface_destroy (z->surface);
_rsvg_node_free(self);
}
static void
rsvg_node_image_draw (RsvgNode * self, RsvgDrawingCtx * ctx, int dominate)
{
RsvgNodeImage *z = (RsvgNodeImage *) self;
unsigned int aspect_ratio = z->preserve_aspect_ratio;
gdouble x, y, w, h;
cairo_surface_t *surface = z->surface;
if (surface == NULL)
return;
x = _rsvg_css_normalize_length (&z->x, ctx, 'h');
y = _rsvg_css_normalize_length (&z->y, ctx, 'v');
w = _rsvg_css_normalize_length (&z->w, ctx, 'h');
h = _rsvg_css_normalize_length (&z->h, ctx, 'v');
rsvg_state_reinherit_top (ctx, z->super.state, dominate);
rsvg_push_discrete_layer (ctx);
if (!rsvg_current_state (ctx)->overflow && (aspect_ratio & RSVG_ASPECT_RATIO_SLICE)) {
rsvg_add_clipping_rect (ctx, x, y, w, h);
}
rsvg_preserve_aspect_ratio (aspect_ratio,
(double) cairo_image_surface_get_width (surface),
(double) cairo_image_surface_get_height (surface),
&w, &h, &x, &y);
rsvg_render_surface (ctx, surface, x, y, w, h);
rsvg_pop_discrete_layer (ctx);
}
static void
rsvg_node_image_set_atts (RsvgNode * self, RsvgHandle * ctx, RsvgPropertyBag * atts)
{
const char *klazz = NULL, *id = NULL, *value;
RsvgNodeImage *image = (RsvgNodeImage *) self;
if (rsvg_property_bag_size (atts)) {
if ((value = rsvg_property_bag_lookup (atts, "x")))
image->x = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "y")))
image->y = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "width")))
image->w = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "height")))
image->h = _rsvg_css_parse_length (value);
/* path is used by some older adobe illustrator versions */
if ((value = rsvg_property_bag_lookup (atts, "path"))
|| (value = rsvg_property_bag_lookup (atts, "xlink:href"))) {
image->surface = rsvg_cairo_surface_new_from_href (value,
rsvg_handle_get_base_uri (ctx),
NULL);
if (!image->surface) {
#ifdef G_ENABLE_DEBUG
g_warning ("Couldn't load image: %s\n", value);
#endif
}
}
if ((value = rsvg_property_bag_lookup (atts, "class")))
klazz = value;
if ((value = rsvg_property_bag_lookup (atts, "id"))) {
id = value;
rsvg_defs_register_name (ctx->priv->defs, id, &image->super);
}
if ((value = rsvg_property_bag_lookup (atts, "preserveAspectRatio")))
image->preserve_aspect_ratio = rsvg_css_parse_aspect_ratio (value);
rsvg_parse_style_attrs (ctx, image->super.state, "image", klazz, id, atts);
}
}
RsvgNode *
rsvg_new_image (void)
{
RsvgNodeImage *image;
image = g_new (RsvgNodeImage, 1);
_rsvg_node_init (&image->super, RSVG_NODE_TYPE_IMAGE);
g_assert (image->super.state);
image->surface = NULL;
image->preserve_aspect_ratio = RSVG_ASPECT_RATIO_XMID_YMID;
image->x = image->y = image->w = image->h = _rsvg_css_parse_length ("0");
image->super.free = rsvg_node_image_free;
image->super.draw = rsvg_node_image_draw;
image->super.set_atts = rsvg_node_image_set_atts;
return &image->super;
}
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