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sp-symbol.cpp

#define __SP_SYMBOL_C__

/*
 * SVG <symbol> implementation
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *
 * Copyright (C) 1999-2003 Lauris Kaplinski
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <cstring>
#include <string>

#include "libnr/nr-matrix-fns.h"
#include "libnr/nr-matrix-ops.h"
#include "display/nr-arena-group.h"
#include "xml/repr.h"
#include "attributes.h"
#include "print.h"
#include "sp-symbol.h"
#include "document.h"

static void sp_symbol_class_init (SPSymbolClass *klass);
static void sp_symbol_init (SPSymbol *symbol);

static void sp_symbol_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
static void sp_symbol_release (SPObject *object);
static void sp_symbol_set (SPObject *object, unsigned int key, const gchar *value);
static void sp_symbol_child_added (SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
static void sp_symbol_update (SPObject *object, SPCtx *ctx, guint flags);
static void sp_symbol_modified (SPObject *object, guint flags);
static Inkscape::XML::Node *sp_symbol_write (SPObject *object, Inkscape::XML::Node *repr, guint flags);

static NRArenaItem *sp_symbol_show (SPItem *item, NRArena *arena, unsigned int key, unsigned int flags);
static void sp_symbol_hide (SPItem *item, unsigned int key);
static void sp_symbol_bbox(SPItem const *item, NRRect *bbox, NR::Matrix const &transform, unsigned const flags);
static void sp_symbol_print (SPItem *item, SPPrintContext *ctx);

static SPGroupClass *parent_class;

GType
sp_symbol_get_type (void)
{
      static GType type = 0;
      if (!type) {
            GTypeInfo info = {
                  sizeof (SPSymbolClass),
                  NULL, NULL,
                  (GClassInitFunc) sp_symbol_class_init,
                  NULL, NULL,
                  sizeof (SPSymbol),
                  16,
                  (GInstanceInitFunc) sp_symbol_init,
                  NULL, /* value_table */
            };
            type = g_type_register_static (SP_TYPE_GROUP, "SPSymbol", &info, (GTypeFlags)0);
      }
      return type;
}

static void
sp_symbol_class_init (SPSymbolClass *klass)
{
      GObjectClass *object_class;
      SPObjectClass *sp_object_class;
      SPItemClass *sp_item_class;

      object_class = G_OBJECT_CLASS (klass);
      sp_object_class = (SPObjectClass *) klass;
      sp_item_class = (SPItemClass *) klass;

      parent_class = (SPGroupClass *)g_type_class_ref (SP_TYPE_GROUP);

      sp_object_class->build = sp_symbol_build;
      sp_object_class->release = sp_symbol_release;
      sp_object_class->set = sp_symbol_set;
      sp_object_class->child_added = sp_symbol_child_added;
      sp_object_class->update = sp_symbol_update;
      sp_object_class->modified = sp_symbol_modified;
      sp_object_class->write = sp_symbol_write;

      sp_item_class->show = sp_symbol_show;
      sp_item_class->hide = sp_symbol_hide;
      sp_item_class->bbox = sp_symbol_bbox;
      sp_item_class->print = sp_symbol_print;
}

static void
sp_symbol_init (SPSymbol *symbol)
{
      symbol->viewBox_set = FALSE;

      nr_matrix_set_identity (&symbol->c2p);
}

static void
sp_symbol_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
{
      SPGroup *group;
      SPSymbol *symbol;

      group = (SPGroup *) object;
      symbol = (SPSymbol *) object;

      sp_object_read_attr (object, "viewBox");
      sp_object_read_attr (object, "preserveAspectRatio");

      if (((SPObjectClass *) parent_class)->build)
            ((SPObjectClass *) parent_class)->build (object, document, repr);
}

static void
sp_symbol_release (SPObject *object)
{
      SPSymbol * symbol;

      symbol = (SPSymbol *) object;

      if (((SPObjectClass *) parent_class)->release)
            ((SPObjectClass *) parent_class)->release (object);
}

static void
sp_symbol_set (SPObject *object, unsigned int key, const gchar *value)
{
      SPItem *item;
      SPSymbol *symbol;

      item = SP_ITEM (object);
      symbol = SP_SYMBOL (object);

      switch (key) {
      case SP_ATTR_VIEWBOX:
            if (value) {
                  double x, y, width, height;
                  char *eptr;
                  /* fixme: We have to take original item affine into account */
                  /* fixme: Think (Lauris) */
                  eptr = (gchar *) value;
                  x = g_ascii_strtod (eptr, &eptr);
                  while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
                  y = g_ascii_strtod (eptr, &eptr);
                  while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
                  width = g_ascii_strtod (eptr, &eptr);
                  while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
                  height = g_ascii_strtod (eptr, &eptr);
                  while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
                  if ((width > 0) && (height > 0)) {
                        /* Set viewbox */
                        symbol->viewBox.x0 = x;
                        symbol->viewBox.y0 = y;
                        symbol->viewBox.x1 = x + width;
                        symbol->viewBox.y1 = y + height;
                        symbol->viewBox_set = TRUE;
                  } else {
                        symbol->viewBox_set = FALSE;
                  }
            } else {
                  symbol->viewBox_set = FALSE;
            }
            object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
            break;
      case SP_ATTR_PRESERVEASPECTRATIO:
            /* Do setup before, so we can use break to escape */
            symbol->aspect_set = FALSE;
            symbol->aspect_align = SP_ASPECT_NONE;
            symbol->aspect_clip = SP_ASPECT_MEET;
            object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
            if (value) {
                  int len;
                  gchar c[256];
                  const gchar *p, *e;
                  unsigned int align, clip;
                  p = value;
                  while (*p && *p == 32) p += 1;
                  if (!*p) break;
                  e = p;
                  while (*e && *e != 32) e += 1;
                  len = e - p;
                  if (len > 8) break;
                  memcpy (c, value, len);
                  c[len] = 0;
                  /* Now the actual part */
                  if (!strcmp (c, "none")) {
                        align = SP_ASPECT_NONE;
                  } else if (!strcmp (c, "xMinYMin")) {
                        align = SP_ASPECT_XMIN_YMIN;
                  } else if (!strcmp (c, "xMidYMin")) {
                        align = SP_ASPECT_XMID_YMIN;
                  } else if (!strcmp (c, "xMaxYMin")) {
                        align = SP_ASPECT_XMAX_YMIN;
                  } else if (!strcmp (c, "xMinYMid")) {
                        align = SP_ASPECT_XMIN_YMID;
                  } else if (!strcmp (c, "xMidYMid")) {
                        align = SP_ASPECT_XMID_YMID;
                  } else if (!strcmp (c, "xMaxYMin")) {
                        align = SP_ASPECT_XMAX_YMID;
                  } else if (!strcmp (c, "xMinYMax")) {
                        align = SP_ASPECT_XMIN_YMAX;
                  } else if (!strcmp (c, "xMidYMax")) {
                        align = SP_ASPECT_XMID_YMAX;
                  } else if (!strcmp (c, "xMaxYMax")) {
                        align = SP_ASPECT_XMAX_YMAX;
                  } else {
                        break;
                  }
                  clip = SP_ASPECT_MEET;
                  while (*e && *e == 32) e += 1;
                  if (e) {
                        if (!strcmp (e, "meet")) {
                              clip = SP_ASPECT_MEET;
                        } else if (!strcmp (e, "slice")) {
                              clip = SP_ASPECT_SLICE;
                        } else {
                              break;
                        }
                  }
                  symbol->aspect_set = TRUE;
                  symbol->aspect_align = align;
                  symbol->aspect_clip = clip;
            }
            break;
      default:
            if (((SPObjectClass *) parent_class)->set)
                  ((SPObjectClass *) parent_class)->set (object, key, value);
            break;
      }
}

static void
sp_symbol_child_added (SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref)
{
      SPSymbol *symbol;
      SPGroup *group;

      symbol = (SPSymbol *) object;
      group = (SPGroup *) object;

      if (((SPObjectClass *) (parent_class))->child_added)
            ((SPObjectClass *) (parent_class))->child_added (object, child, ref);
}

static void
sp_symbol_update (SPObject *object, SPCtx *ctx, guint flags)
{
      SPItem *item;
      SPSymbol *symbol;
      SPItemCtx *ictx, rctx;
      SPItemView *v;

      item = SP_ITEM (object);
      symbol = SP_SYMBOL (object);
      ictx = (SPItemCtx *) ctx;

      if (SP_OBJECT_IS_CLONED (object)) {
            /* Cloned <symbol> is actually renderable */

            /* fixme: We have to set up clip here too */

            /* Create copy of item context */
            rctx = *ictx;

            /* Calculate child to parent transformation */
            /* Apply parent <use> translation (set up as vewport) */
            nr_matrix_set_translate (&symbol->c2p, rctx.vp.x0, rctx.vp.y0);

            if (symbol->viewBox_set) {
                  double x, y, width, height;
                  NRMatrix q;
                  /* Determine actual viewbox in viewport coordinates */
                  if (symbol->aspect_align == SP_ASPECT_NONE) {
                        x = 0.0;
                        y = 0.0;
                        width = rctx.vp.x1 - rctx.vp.x0;
                        height = rctx.vp.y1 - rctx.vp.y0;
                  } else {
                        double scalex, scaley, scale;
                        /* Things are getting interesting */
                        scalex = (rctx.vp.x1 - rctx.vp.x0) / (symbol->viewBox.x1 - symbol->viewBox.x0);
                        scaley = (rctx.vp.y1 - rctx.vp.y0) / (symbol->viewBox.y1 - symbol->viewBox.y0);
                        scale = (symbol->aspect_clip == SP_ASPECT_MEET) ? MIN (scalex, scaley) : MAX (scalex, scaley);
                        width = (symbol->viewBox.x1 - symbol->viewBox.x0) * scale;
                        height = (symbol->viewBox.y1 - symbol->viewBox.y0) * scale;
                        /* Now place viewbox to requested position */
                        switch (symbol->aspect_align) {
                        case SP_ASPECT_XMIN_YMIN:
                              x = 0.0;
                              y = 0.0;
                              break;
                        case SP_ASPECT_XMID_YMIN:
                              x = 0.5 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                              y = 0.0;
                              break;
                        case SP_ASPECT_XMAX_YMIN:
                              x = 1.0 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                              y = 0.0;
                              break;
                        case SP_ASPECT_XMIN_YMID:
                              x = 0.0;
                              y = 0.5 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                              break;
                        case SP_ASPECT_XMID_YMID:
                              x = 0.5 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                              y = 0.5 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                              break;
                        case SP_ASPECT_XMAX_YMID:
                              x = 1.0 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                              y = 0.5 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                              break;
                        case SP_ASPECT_XMIN_YMAX:
                              x = 0.0;
                              y = 1.0 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                              break;
                        case SP_ASPECT_XMID_YMAX:
                              x = 0.5 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                              y = 1.0 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                              break;
                        case SP_ASPECT_XMAX_YMAX:
                              x = 1.0 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                              y = 1.0 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                              break;
                        default:
                              x = 0.0;
                              y = 0.0;
                              break;
                        }
                  }
                  /* Compose additional transformation from scale and position */
                  q.c[0] = width / (symbol->viewBox.x1 - symbol->viewBox.x0);
                  q.c[1] = 0.0;
                  q.c[2] = 0.0;
                  q.c[3] = height / (symbol->viewBox.y1 - symbol->viewBox.y0);
                  q.c[4] = -symbol->viewBox.x0 * q.c[0] + x;
                  q.c[5] = -symbol->viewBox.y0 * q.c[3] + y;
                  /* Append viewbox transformation */
                  nr_matrix_multiply (&symbol->c2p, &q, &symbol->c2p);
            }

            rctx.i2doc = symbol->c2p * rctx.i2doc;

            /* If viewBox is set initialize child viewport */
            /* Otherwise <use> has set it up already */
            if (symbol->viewBox_set) {
                  rctx.vp.x0 = symbol->viewBox.x0;
                  rctx.vp.y0 = symbol->viewBox.y0;
                  rctx.vp.x1 = symbol->viewBox.x1;
                  rctx.vp.y1 = symbol->viewBox.y1;
                  rctx.i2vp = NR::identity();
            }

            /* And invoke parent method */
            if (((SPObjectClass *) (parent_class))->update)
                  ((SPObjectClass *) (parent_class))->update (object, (SPCtx *) &rctx, flags);

            /* As last step set additional transform of arena group */
            for (v = item->display; v != NULL; v = v->next) {
                  nr_arena_group_set_child_transform(NR_ARENA_GROUP(v->arenaitem), &symbol->c2p);
            }
      } else {
            /* No-op */
            if (((SPObjectClass *) (parent_class))->update)
                  ((SPObjectClass *) (parent_class))->update (object, ctx, flags);
      }
}

static void
sp_symbol_modified (SPObject *object, guint flags)
{
      SPSymbol *symbol;

      symbol = SP_SYMBOL (object);

      if (((SPObjectClass *) (parent_class))->modified)
            (* ((SPObjectClass *) (parent_class))->modified) (object, flags);
}

static Inkscape::XML::Node *
sp_symbol_write (SPObject *object, Inkscape::XML::Node *repr, guint flags)
{
      SPSymbol *symbol;

      symbol = SP_SYMBOL (object);

      if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
            Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_OBJECT_DOCUMENT(object));
            repr = xml_doc->createElement("svg:symbol");
      }

      repr->setAttribute("viewBox", object->repr->attribute("viewBox"));
      repr->setAttribute("preserveAspectRatio", object->repr->attribute("preserveAspectRatio"));

      if (((SPObjectClass *) (parent_class))->write)
            ((SPObjectClass *) (parent_class))->write (object, repr, flags);

      return repr;
}

static NRArenaItem *
sp_symbol_show (SPItem *item, NRArena *arena, unsigned int key, unsigned int flags)
{
      SPSymbol *symbol;
      NRArenaItem *ai;

      symbol = SP_SYMBOL (item);

      if (SP_OBJECT_IS_CLONED (symbol)) {
            /* Cloned <symbol> is actually renderable */
            if (((SPItemClass *) (parent_class))->show) {
                  ai = ((SPItemClass *) (parent_class))->show (item, arena, key, flags);
                  if (ai) {
                        nr_arena_group_set_child_transform(NR_ARENA_GROUP(ai), &symbol->c2p);
                  }
            } else {
                  ai = NULL;
            }
      } else {
            ai = NULL;
      }

      return ai;
}

static void
sp_symbol_hide (SPItem *item, unsigned int key)
{
      SPSymbol *symbol;

      symbol = SP_SYMBOL (item);

      if (SP_OBJECT_IS_CLONED (symbol)) {
            /* Cloned <symbol> is actually renderable */
            if (((SPItemClass *) (parent_class))->hide)
                  ((SPItemClass *) (parent_class))->hide (item, key);
      }
}

static void
sp_symbol_bbox(SPItem const *item, NRRect *bbox, NR::Matrix const &transform, unsigned const flags)
{
      SPSymbol const *symbol = SP_SYMBOL(item);

      if (SP_OBJECT_IS_CLONED (symbol)) {
            /* Cloned <symbol> is actually renderable */

            if (((SPItemClass *) (parent_class))->bbox) {
                  NR::Matrix const a( symbol->c2p * transform );
                  ((SPItemClass *) (parent_class))->bbox(item, bbox, a, flags);
            }
      }
}

static void
sp_symbol_print (SPItem *item, SPPrintContext *ctx)
{
      SPSymbol *symbol = SP_SYMBOL(item);
      if (SP_OBJECT_IS_CLONED (symbol)) {
            /* Cloned <symbol> is actually renderable */

            sp_print_bind(ctx, &symbol->c2p, 1.0);

            if (((SPItemClass *) (parent_class))->print) {
                  ((SPItemClass *) (parent_class))->print (item, ctx);
            }

            sp_print_release (ctx);
      }
}

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