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/* Swfdec
* Copyright (C) 2007 Benjamin Otte <otte@gnome.org>
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "swfdec_draw.h"
#include "swfdec_color.h"
#include "swfdec_debug.h"
#include "swfdec_path.h"
/*** DRAW ***/
G_DEFINE_ABSTRACT_TYPE (SwfdecDraw, swfdec_draw, G_TYPE_OBJECT);
static gboolean
swfdec_draw_can_morph (SwfdecDraw *draw)
{
return draw->end_path.num_data > 0;
}
static void
swfdec_draw_do_morph (SwfdecDraw* dest, SwfdecDraw *source, guint ratio)
{
if (swfdec_draw_can_morph (source)) {
swfdec_path_merge (&dest->path, &source->path, &source->end_path, ratio / 65535.);
} else {
swfdec_path_copy (&dest->path, &source->path);
}
}
static void
swfdec_draw_dispose (GObject *object)
{
SwfdecDraw *draw = SWFDEC_DRAW (object);
swfdec_path_reset (&draw->path);
swfdec_path_reset (&draw->end_path);
G_OBJECT_CLASS (swfdec_draw_parent_class)->dispose (object);
}
static void
swfdec_draw_class_init (SwfdecDrawClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = swfdec_draw_dispose;
klass->morph = swfdec_draw_do_morph;
}
static void
swfdec_draw_init (SwfdecDraw *draw)
{
swfdec_path_init (&draw->path);
swfdec_path_init (&draw->end_path);
}
/**
* swfdec_draw_morph:
* @draw: a #SwfdecDraw
* @ratio: ratio of the morph from 0 to 65535
*
* Applies a morph to the given drawing operation. If the drawing operation
* can not be morphed, it is returned unchanged. Otherwise a new drawing
* operation is created.
*
* Returns: a new reference to a #SwfdecDraw corresponding to the given morph
* ratio
**/
SwfdecDraw *
swfdec_draw_morph (SwfdecDraw *draw, guint ratio)
{
SwfdecDrawClass *klass;
SwfdecDraw *copy;
g_return_val_if_fail (SWFDEC_IS_DRAW (draw), NULL);
g_return_val_if_fail (ratio < 65536, NULL);
if (!swfdec_draw_can_morph (draw) || ratio == 0) {
/* not a morph */
g_object_ref (draw);
return draw;
}
klass = SWFDEC_DRAW_GET_CLASS (draw);
g_assert (klass->morph);
copy = g_object_new (G_OBJECT_CLASS_TYPE (klass), NULL);
klass->morph (copy, draw, ratio);
swfdec_draw_recompute (copy);
return copy;
}
SwfdecDraw *
swfdec_draw_copy (SwfdecDraw *draw)
{
SwfdecDrawClass *klass;
SwfdecDraw *copy;
g_return_val_if_fail (SWFDEC_IS_DRAW (draw), NULL);
klass = SWFDEC_DRAW_GET_CLASS (draw);
g_assert (klass->morph);
copy = g_object_new (G_OBJECT_CLASS_TYPE (klass), NULL);
klass->morph (copy, draw, 0);
swfdec_draw_recompute (copy);
return copy;
}
/**
* swfdec_draw_paint:
* @draw: drawing operation to perform
* @cr: context to perform the operation on
* @trans: color transofrmation to apply
*
* Draws the given drawing operation on the given Cairo context.
**/
void
swfdec_draw_paint (SwfdecDraw *draw, cairo_t *cr, const SwfdecColorTransform *trans)
{
SwfdecDrawClass *klass;
g_return_if_fail (SWFDEC_IS_DRAW (draw));
g_return_if_fail (draw->path.num_data > 0);
g_return_if_fail (cr != NULL);
g_return_if_fail (trans != NULL);
klass = SWFDEC_DRAW_GET_CLASS (draw);
g_assert (klass->paint);
klass->paint (draw, cr, trans);
}
static gpointer
swfdec_draw_init_empty_surface (gpointer unused)
{
return cairo_image_surface_create (CAIRO_FORMAT_A1, 1, 1);
}
/**
* swfdec_draw_contains:
* @draw: a #SwfdecDraw
* @x: x coordinate to check
* @y: y coordinate to check
*
* Checks if the given @x and @y coordinate is inside or outside the area drawn
* by the given drawing operation.
*
* Returns: %TRUE if the coordinates are inside the drawing operation.
**/
gboolean
swfdec_draw_contains (SwfdecDraw *draw, double x, double y)
{
static GOnce empty_surface = G_ONCE_INIT;
SwfdecDrawClass *klass;
cairo_t *cr;
gboolean result;
g_return_val_if_fail (SWFDEC_IS_DRAW (draw), FALSE);
if (!swfdec_rect_contains (&draw->extents, x, y))
return FALSE;
g_once (&empty_surface, swfdec_draw_init_empty_surface, NULL);
klass = SWFDEC_DRAW_GET_CLASS (draw);
g_assert (klass->contains);
cr = cairo_create (empty_surface.retval);
result = klass->contains (draw, cr, x, y);
cairo_destroy (cr);
return result;
}
/**
* swfdec_draw_recompute:
* @draw: a #SwfdecDraw
*
* This function must be called after a call to swfdec_draw_append_path() but
* before using swfdec_draw_paint() again. It updates internal state and caches,
* in particular the extents of this drawing operation.
**/
void
swfdec_draw_recompute (SwfdecDraw *draw)
{
SwfdecDrawClass *klass;
g_return_if_fail (SWFDEC_IS_DRAW (draw));
klass = SWFDEC_DRAW_GET_CLASS (draw);
g_assert (klass->compute_extents);
klass->compute_extents (draw);
}
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