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nr-arena-group.cpp

#define __NR_ARENA_GROUP_C__

/*
 * RGBA display list system for inkscape
 *
 * Author:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *
 * Copyright (C) 2001-2002 Lauris Kaplinski
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include <math.h>
#include <glib.h>
#include <libnr/nr-rect.h>
#include <libnr/nr-matrix.h>
#include <libnr/nr-blit.h>
#include "nr-arena-group.h"

static void nr_arena_group_class_init (NRArenaGroupClass *klass);
static void nr_arena_group_init (NRArenaGroup *group);

static NRArenaItem *nr_arena_group_children (NRArenaItem *item);
static NRArenaItem *nr_arena_group_last_child (NRArenaItem *item);
static void nr_arena_group_add_child (NRArenaItem *item, NRArenaItem *child, NRArenaItem *ref);
static void nr_arena_group_remove_child (NRArenaItem *item, NRArenaItem *child);
static void nr_arena_group_set_child_position (NRArenaItem *item, NRArenaItem *child, NRArenaItem *ref);

static unsigned int nr_arena_group_update (NRArenaItem *item, NRRectL *area, NRGC *gc, unsigned int state, unsigned int reset);
static unsigned int nr_arena_group_render (NRArenaItem *item, NRRectL *area, NRPixBlock *pb, unsigned int flags);
static unsigned int nr_arena_group_clip (NRArenaItem *item, NRRectL *area, NRPixBlock *pb);
static NRArenaItem *nr_arena_group_pick (NRArenaItem *item, NR::Point p, double delta, unsigned int sticky);

static NRArenaItemClass *parent_class;

NRType
nr_arena_group_get_type (void)
{
      static NRType type = 0;
      if (!type) {
            type = nr_object_register_type (NR_TYPE_ARENA_ITEM,
                                    "NRArenaGroup",
                                    sizeof (NRArenaGroupClass),
                                    sizeof (NRArenaGroup),
                                    (void (*) (NRObjectClass *)) nr_arena_group_class_init,
                                    (void (*) (NRObject *)) nr_arena_group_init);
      }
      return type;
}

static void
nr_arena_group_class_init (NRArenaGroupClass *klass)
{
      NRObjectClass *object_class;
      NRArenaItemClass *item_class;

      object_class = (NRObjectClass *) klass;
      item_class = (NRArenaItemClass *) klass;

      parent_class = (NRArenaItemClass *) ((NRObjectClass *) klass)->parent;

      object_class->cpp_ctor = NRObject::invoke_ctor<NRArenaGroup>;

      item_class->children = nr_arena_group_children;
      item_class->last_child = nr_arena_group_last_child;
      item_class->add_child = nr_arena_group_add_child;
      item_class->set_child_position = nr_arena_group_set_child_position;
      item_class->remove_child = nr_arena_group_remove_child;
      item_class->update = nr_arena_group_update;
      item_class->render = nr_arena_group_render;
      item_class->clip = nr_arena_group_clip;
      item_class->pick = nr_arena_group_pick;
}

static void
nr_arena_group_init (NRArenaGroup *group)
{
      group->transparent = FALSE;
      group->children = NULL;
      group->last = NULL;
      nr_matrix_set_identity (&group->child_transform);
  
#ifdef arena_item_tile_cache
  group->skipCaching=true;
#endif

}

static NRArenaItem *
nr_arena_group_children (NRArenaItem *item)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      return group->children;
}

static NRArenaItem *
nr_arena_group_last_child (NRArenaItem *item)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      return group->last;
}

static void
nr_arena_group_add_child (NRArenaItem *item, NRArenaItem *child, NRArenaItem *ref)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      if (!ref) {
            group->children = nr_arena_item_attach_ref (item, child, NULL, group->children);
      } else {
            ref->next = nr_arena_item_attach_ref (item, child, ref, ref->next);
      }

      if (ref == group->last) group->last = child;

      nr_arena_item_request_update (item, NR_ARENA_ITEM_STATE_ALL, FALSE);
}

static void
nr_arena_group_remove_child (NRArenaItem *item, NRArenaItem *child)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      if (child == group->last) group->last = child->prev;

      if (child->prev) {
            nr_arena_item_detach_unref (item, child);
      } else {
            group->children = nr_arena_item_detach_unref (item, child);
      }

      nr_arena_item_request_update (item, NR_ARENA_ITEM_STATE_ALL, FALSE);
}

static void
nr_arena_group_set_child_position (NRArenaItem *item, NRArenaItem *child, NRArenaItem *ref)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      if (child == group->last) group->last = child->prev;

      if (child->prev) {
            nr_arena_item_detach_unref (item, child);
      } else {
            group->children = nr_arena_item_detach_unref (item, child);
      }

      if (!ref) {
            group->children = nr_arena_item_attach_ref (item, child, NULL, group->children);
      } else {
            ref->next = nr_arena_item_attach_ref (item, child, ref, ref->next);
      }

      if (ref == group->last) group->last = child;

      nr_arena_item_request_render (child);
}

static unsigned int
nr_arena_group_update (NRArenaItem *item, NRRectL *area, NRGC *gc, unsigned int state, unsigned int reset)
{
      unsigned int newstate;

      NRArenaGroup *group = NR_ARENA_GROUP (item);

      unsigned int beststate = NR_ARENA_ITEM_STATE_ALL;

      for (NRArenaItem *child = group->children; child != NULL; child = child->next) {
            NRGC cgc(gc);
            nr_matrix_multiply (&cgc.transform, &group->child_transform, &gc->transform);
            newstate = nr_arena_item_invoke_update (child, area, &cgc, state, reset);
            beststate = beststate & newstate;
      }

      if (beststate & NR_ARENA_ITEM_STATE_BBOX) {
            nr_rect_l_set_empty (&item->bbox);
            for (NRArenaItem *child = group->children; child != NULL; child = child->next) {
                  nr_rect_l_union (&item->bbox, &item->bbox, &child->bbox);
            }
      }

      return beststate;
}

static unsigned int
nr_arena_group_render (NRArenaItem *item, NRRectL *area, NRPixBlock *pb, unsigned int flags)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      unsigned int ret = item->state;

      /* Just compose children into parent buffer */
      for (NRArenaItem *child = group->children; child != NULL; child = child->next) {
            ret = nr_arena_item_invoke_render (child, area, pb, flags);
            if (ret & NR_ARENA_ITEM_STATE_INVALID) break;
      }

      return ret;
}

static unsigned int
nr_arena_group_clip (NRArenaItem *item, NRRectL *area, NRPixBlock *pb)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      unsigned int ret = item->state;

      /* Just compose children into parent buffer */
      for (NRArenaItem *child = group->children; child != NULL; child = child->next) {
            ret = nr_arena_item_invoke_clip (child, area, pb);
            if (ret & NR_ARENA_ITEM_STATE_INVALID) break;
      }

      return ret;
}

static NRArenaItem *
nr_arena_group_pick (NRArenaItem *item, NR::Point p, double delta, unsigned int sticky)
{
      NRArenaGroup *group = NR_ARENA_GROUP (item);

      for (NRArenaItem *child = group->last; child != NULL; child = child->prev) {
            NRArenaItem *picked = nr_arena_item_invoke_pick (child, p, delta, sticky);
            if (picked)
                  return (group->transparent) ? picked : item;
      }

      return NULL;
}

void
nr_arena_group_set_transparent (NRArenaGroup *group, unsigned int transparent)
{
      nr_return_if_fail (group != NULL);
      nr_return_if_fail (NR_IS_ARENA_GROUP (group));

      group->transparent = transparent;
}

void nr_arena_group_set_child_transform(NRArenaGroup *group, NR::Matrix const &t)
{
      NRMatrix nt(t);
      nr_arena_group_set_child_transform(group, &nt);
}

void nr_arena_group_set_child_transform(NRArenaGroup *group, NRMatrix const *t)
{
      if (!t) t = &NR_MATRIX_IDENTITY;

      if (!NR_MATRIX_DF_TEST_CLOSE (t, &group->child_transform, NR_EPSILON)) {
            nr_arena_item_request_render (NR_ARENA_ITEM (group));
            group->child_transform = *t;
            nr_arena_item_request_update (NR_ARENA_ITEM (group), NR_ARENA_ITEM_STATE_ALL, TRUE);
      }
}



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