moving trunk for module inkscape

(bzr r1)

1 files changed, 913 insertions, 0 deletions

diff --git a/src/sp-text.cpp b/src/sp-text.cpp
new file mode 100644
index 000000000..3bbb3b892
--- /dev/null
+++ b/src/sp-text.cpp
@@ -0,0 +1,913 @@
+/*
+ * SVG <text> and <tspan> implementation
+ *
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+/*
+ * fixme:
+ *
+ * These subcomponents should not be items, or alternately
+ * we have to invent set of flags to mark, whether standard
+ * attributes are applicable to given item (I even like this
+ * idea somewhat - Lauris)
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <libnr/nr-matrix-fns.h>
+#include <libnrtype/FontFactory.h>
+#include <libnrtype/font-instance.h>
+#include <libnrtype/font-style-to-pos.h>
+
+#include <glibmm/i18n.h>
+#include "svg/svg.h"
+#include "svg/stringstream.h"
+#include "display/nr-arena-glyphs.h"
+#include "attributes.h"
+#include "document.h"
+#include "desktop-handles.h"
+#include "sp-namedview.h"
+#include "style.h"
+#include "inkscape.h"
+#include "sp-metrics.h"
+#include "xml/quote.h"
+#include "xml/repr.h"
+#include "mod360.h"
+
+#include "sp-textpath.h"
+#include "sp-tspan.h"
+
+#include "text-editing.h"
+
+/*#####################################################
+#  SPTEXT
+#####################################################*/
+
+static void sp_text_class_init (SPTextClass *classname);
+static void sp_text_init (SPText *text);
+static void sp_text_release (SPObject *object);
+
+static void sp_text_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
+static void sp_text_set (SPObject *object, unsigned key, gchar const *value);
+static void sp_text_child_added (SPObject *object, Inkscape::XML::Node *rch, Inkscape::XML::Node *ref);
+static void sp_text_remove_child (SPObject *object, Inkscape::XML::Node *rch);
+static void sp_text_update (SPObject *object, SPCtx *ctx, guint flags);
+static void sp_text_modified (SPObject *object, guint flags);
+static Inkscape::XML::Node *sp_text_write (SPObject *object, Inkscape::XML::Node *repr, guint flags);
+
+static void sp_text_bbox(SPItem const *item, NRRect *bbox, NR::Matrix const &transform, unsigned const flags);
+static NRArenaItem *sp_text_show (SPItem *item, NRArena *arena, unsigned key, unsigned flags);
+static void sp_text_hide (SPItem *item, unsigned key);
+static char *sp_text_description (SPItem *item);
+static void sp_text_snappoints(SPItem const *item, SnapPointsIter p);
+static NR::Matrix sp_text_set_transform(SPItem *item, NR::Matrix const &xform);
+static void sp_text_print (SPItem *item, SPPrintContext *gpc);
+
+static SPItemClass *text_parent_class;
+
+GType
+sp_text_get_type ()
+{
+    static GType type = 0;
+    if (!type) {
+        GTypeInfo info = {
+            sizeof (SPTextClass),
+            NULL,    /* base_init */
+            NULL,    /* base_finalize */
+            (GClassInitFunc) sp_text_class_init,
+            NULL,    /* class_finalize */
+            NULL,    /* class_data */
+            sizeof (SPText),
+            16,    /* n_preallocs */
+            (GInstanceInitFunc) sp_text_init,
+            NULL,    /* value_table */
+        };
+        type = g_type_register_static (SP_TYPE_ITEM, "SPText", &info, (GTypeFlags)0);
+    }
+    return type;
+}
+
+static void
+sp_text_class_init (SPTextClass *classname)
+{
+    SPObjectClass *sp_object_class = (SPObjectClass *) classname;
+    SPItemClass *item_class = (SPItemClass *) classname;
+
+    text_parent_class = (SPItemClass*)g_type_class_ref (SP_TYPE_ITEM);
+
+    sp_object_class->release = sp_text_release;
+    sp_object_class->build = sp_text_build;
+    sp_object_class->set = sp_text_set;
+    sp_object_class->child_added = sp_text_child_added;
+    sp_object_class->remove_child = sp_text_remove_child;
+    sp_object_class->update = sp_text_update;
+    sp_object_class->modified = sp_text_modified;
+    sp_object_class->write = sp_text_write;
+
+    item_class->bbox = sp_text_bbox;
+    item_class->show = sp_text_show;
+    item_class->hide = sp_text_hide;
+    item_class->description = sp_text_description;
+    item_class->snappoints = sp_text_snappoints;
+    item_class->set_transform = sp_text_set_transform;
+    item_class->print = sp_text_print;
+}
+
+static void
+sp_text_init (SPText *text)
+{
+    new (&text->layout) Inkscape::Text::Layout;
+    new (&text->attributes) TextTagAttributes;
+}
+
+static void
+sp_text_release (SPObject *object)
+{
+    SPText *text = SP_TEXT(object);
+    text->attributes.~TextTagAttributes();
+    text->layout.~Layout();
+
+    if (((SPObjectClass *) text_parent_class)->release)
+        ((SPObjectClass *) text_parent_class)->release(object);
+}
+
+static void
+sp_text_build (SPObject *object, SPDocument *doc, Inkscape::XML::Node *repr)
+{
+    sp_object_read_attr(object, "x");
+    sp_object_read_attr(object, "y");
+    sp_object_read_attr(object, "dx");
+    sp_object_read_attr(object, "dy");
+    sp_object_read_attr(object, "rotate");
+
+    if (((SPObjectClass *) text_parent_class)->build)
+        ((SPObjectClass *) text_parent_class)->build(object, doc, repr);
+
+    sp_object_read_attr(object, "sodipodi:linespacing");    // has to happen after the styles are read
+}
+
+static void
+sp_text_set(SPObject *object, unsigned key, gchar const *value)
+{
+    SPText *text = SP_TEXT (object);
+
+    if (text->attributes.readSingleAttribute(key, value)) {
+        object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+    } else {
+        switch (key) {
+            case SP_ATTR_SODIPODI_LINESPACING:
+                // convert deprecated tag to css
+                if (value) {
+                    text->style->line_height.set = TRUE;
+                    text->style->line_height.inherit = FALSE;
+                    text->style->line_height.normal = FALSE;
+                    text->style->line_height.unit = SP_CSS_UNIT_PERCENT;
+                    text->style->line_height.value = text->style->line_height.computed = sp_svg_read_percentage (value, 1.0);
+                }
+                object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_TEXT_LAYOUT_MODIFIED_FLAG);
+                break;
+            default:
+                if (((SPObjectClass *) text_parent_class)->set)
+                    ((SPObjectClass *) text_parent_class)->set (object, key, value);
+                break;
+        }
+    }
+}
+
+static void
+sp_text_child_added (SPObject *object, Inkscape::XML::Node *rch, Inkscape::XML::Node *ref)
+{
+    SPText *text = SP_TEXT (object);
+
+    if (((SPObjectClass *) text_parent_class)->child_added)
+        ((SPObjectClass *) text_parent_class)->child_added (object, rch, ref);
+
+    text->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_TEXT_CONTENT_MODIFIED_FLAG);
+}
+
+static void
+sp_text_remove_child (SPObject *object, Inkscape::XML::Node *rch)
+{
+    SPText *text = SP_TEXT (object);
+
+    if (((SPObjectClass *) text_parent_class)->remove_child)
+        ((SPObjectClass *) text_parent_class)->remove_child (object, rch);
+
+    text->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_TEXT_CONTENT_MODIFIED_FLAG | SP_TEXT_LAYOUT_MODIFIED_FLAG);
+}
+
+static void
+sp_text_update (SPObject *object, SPCtx *ctx, guint flags)
+{
+    SPText *text = SP_TEXT (object);
+
+    if (((SPObjectClass *) text_parent_class)->update)
+        ((SPObjectClass *) text_parent_class)->update (object, ctx, flags);
+
+    guint cflags = (flags & SP_OBJECT_MODIFIED_CASCADE);
+    if (flags & SP_OBJECT_MODIFIED_FLAG) cflags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+
+
+    /* Create temporary list of children */
+    GSList *l = NULL;
+    for (SPObject *child = sp_object_first_child(object) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+        sp_object_ref (SP_OBJECT (child), object);
+        l = g_slist_prepend (l, child);
+    }
+    l = g_slist_reverse (l);
+    while (l) {
+        SPObject *child = SP_OBJECT (l->data);
+        l = g_slist_remove (l, child);
+        if (cflags || (child->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            /* fixme: Do we need transform? */
+            child->updateDisplay(ctx, cflags);
+        }
+        sp_object_unref (SP_OBJECT (child), object);
+    }
+    if (flags & ( SP_OBJECT_STYLE_MODIFIED_FLAG |
+                  SP_OBJECT_CHILD_MODIFIED_FLAG |
+                  SP_TEXT_LAYOUT_MODIFIED_FLAG   ) )
+    {
+        /* fixme: It is not nice to have it here, but otherwise children content changes does not work */
+        /* fixme: Even now it may not work, as we are delayed */
+        /* fixme: So check modification flag everywhere immediate state is used */
+        text->rebuildLayout();
+
+        NRRect paintbox;
+        sp_item_invoke_bbox(text, &paintbox, NR::identity(), TRUE);
+        for (SPItemView* v = text->display; v != NULL; v = v->next) {
+            text->_clearFlow(NR_ARENA_GROUP(v->arenaitem));
+            // pass the bbox of the text object as paintbox (used for paintserver fills)
+            text->layout.show(NR_ARENA_GROUP(v->arenaitem), &paintbox);
+        }
+    }
+}
+
+static void
+sp_text_modified (SPObject *object, guint flags)
+{
+    if (((SPObjectClass *) text_parent_class)->modified)
+        ((SPObjectClass *) text_parent_class)->modified (object, flags);
+
+    guint cflags = (flags & SP_OBJECT_MODIFIED_CASCADE);
+    if (flags & SP_OBJECT_MODIFIED_FLAG) cflags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+
+    /* Create temporary list of children */
+    GSList *l = NULL;
+    SPObject *child;
+    for (child = sp_object_first_child(object) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+        sp_object_ref (SP_OBJECT (child), object);
+        l = g_slist_prepend (l, child);
+    }
+    l = g_slist_reverse (l);
+    while (l) {
+        child = SP_OBJECT (l->data);
+        l = g_slist_remove (l, child);
+        if (cflags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+            child->emitModified(cflags);
+        }
+        sp_object_unref (SP_OBJECT (child), object);
+    }
+}
+
+static Inkscape::XML::Node *
+sp_text_write (SPObject *object, Inkscape::XML::Node *repr, guint flags)
+{
+    SPText *text = SP_TEXT (object);
+
+    if (flags & SP_OBJECT_WRITE_BUILD) {
+        if (!repr)
+            repr = sp_repr_new ("svg:text");
+        GSList *l = NULL;
+        for (SPObject *child = sp_object_first_child(object) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+            Inkscape::XML::Node *crepr = NULL;
+            if (SP_IS_STRING(child)) {
+                crepr = sp_repr_new_text(SP_STRING(child)->string.c_str());
+            } else {
+                crepr = child->updateRepr(NULL, flags);
+            }
+            if (crepr) l = g_slist_prepend (l, crepr);
+        }
+        while (l) {
+            repr->addChild((Inkscape::XML::Node *) l->data, NULL);
+            Inkscape::GC::release((Inkscape::XML::Node *) l->data);
+            l = g_slist_remove (l, l->data);
+        }
+    } else {
+        for (SPObject *child = sp_object_first_child(object) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+            if (SP_IS_STRING(child)) {
+                SP_OBJECT_REPR(child)->setContent(SP_STRING(child)->string.c_str());
+            } else {
+                child->updateRepr(flags);
+            }
+        }
+    }
+
+    text->attributes.writeTo(repr);
+
+    // deprecated attribute, but keep it around for backwards compatibility
+    if (text->style->line_height.set && !text->style->line_height.inherit && !text->style->line_height.normal && text->style->line_height.unit == SP_CSS_UNIT_PERCENT) {
+        Inkscape::SVGOStringStream os;
+        os << (text->style->line_height.value * 100.0) << "%";
+        SP_OBJECT_REPR(text)->setAttribute("sodipodi:linespacing", os.str().c_str());
+    }
+    else
+        SP_OBJECT_REPR(text)->setAttribute("sodipodi:linespacing", NULL);
+
+    if (((SPObjectClass *) (text_parent_class))->write)
+        ((SPObjectClass *) (text_parent_class))->write (object, repr, flags);
+
+    return repr;
+}
+
+static void
+sp_text_bbox(SPItem const *item, NRRect *bbox, NR::Matrix const &transform, unsigned const /*flags*/)
+{
+    SP_TEXT(item)->layout.getBoundingBox(bbox, transform);
+
+    // Add stroke width
+    SPStyle* style=SP_OBJECT_STYLE (item);
+    if (style->stroke.type != SP_PAINT_TYPE_NONE) {
+        double const scale = expansion(transform);
+        if ( fabs(style->stroke_width.computed * scale) > 0.01 ) { // sinon c'est 0=oon veut pas de bord
+            double const width = MAX(0.125, style->stroke_width.computed * scale);
+            if ( fabs(bbox->x1 - bbox->x0) > -0.00001 && fabs(bbox->y1 - bbox->y0) > -0.00001 ) {
+                bbox->x0-=0.5*width;
+                bbox->x1+=0.5*width;
+                bbox->y0-=0.5*width;
+                bbox->y1+=0.5*width;
+            }
+        }
+    }
+}
+
+
+static NRArenaItem *
+sp_text_show(SPItem *item, NRArena *arena, unsigned /* key*/, unsigned /*flags*/)
+{
+    SPText *group = (SPText *) item;
+
+    NRArenaGroup *flowed = NRArenaGroup::create(arena);
+    nr_arena_group_set_transparent (flowed, FALSE);
+
+    // pass the bbox of the text object as paintbox (used for paintserver fills)
+    NRRect paintbox;
+    sp_item_invoke_bbox(item, &paintbox, NR::identity(), TRUE);
+    group->layout.show(flowed, &paintbox);
+
+    return flowed;
+}
+
+static void
+sp_text_hide(SPItem *item, unsigned key)
+{
+    if (((SPItemClass *) text_parent_class)->hide)
+        ((SPItemClass *) text_parent_class)->hide (item, key);
+}
+
+static char *
+sp_text_description(SPItem *item)
+{
+    SPText *text = (SPText *) item;
+    SPStyle *style = SP_OBJECT_STYLE(text);
+
+    font_instance *tf = (font_factory::Default())->Face(style->text->font_family.value,
+                                                        font_style_to_pos(*style));
+    char name_buf[256];
+    char *n;
+    if (tf) {
+        tf->Name(name_buf, sizeof(name_buf));
+        n = xml_quote_strdup(name_buf);
+        tf->Unref();
+    } else {
+        /* TRANSLATORS: For description of font with no name. */
+        n = g_strdup(_("&lt;no name found&gt;"));
+    }
+
+    GString *xs = SP_PX_TO_METRIC_STRING(style->font_size.computed, SP_DT_NAMEDVIEW(SP_ACTIVE_DESKTOP)->getDefaultMetric());
+
+    char *ret = ( SP_IS_TEXT_TEXTPATH(item)
+                  ? g_strdup_printf(_("<b>Text on path</b> (%s, %s)"), n, xs->str)
+                  : g_strdup_printf(_("<b>Text</b> (%s, %s)"), n, xs->str) );
+    g_free(n);
+    return ret;
+}
+
+static void sp_text_snappoints(SPItem const *item, SnapPointsIter p)
+{
+    // the baseline anchor of the first char
+    Inkscape::Text::Layout const *layout = te_get_layout((SPItem *) item);
+    if(layout != NULL) {
+        *p = layout->characterAnchorPoint(layout->begin()) * sp_item_i2d_affine(item);
+    }
+}
+
+static NR::Matrix
+sp_text_set_transform (SPItem *item, NR::Matrix const &xform)
+{
+    SPText *text = SP_TEXT(item);
+
+    // we cannot optimize textpath because changing its fontsize will break its match to the path
+    if (SP_IS_TEXT_TEXTPATH (text))
+        return xform;
+
+    /* This function takes care of scaling & translation only, we return whatever parts we can't
+       handle. */
+
+// TODO: pjrm tried to use fontsize_expansion(xform) here and it works for text in that font size
+// is scaled more intuitively when scaling non-uniformly; however this necessitated using
+// fontsize_expansion instead of expansion in other places too, where it was not appropriate
+// (e.g. it broke stroke width on copy/pasting of style from horizontally stretched to vertically
+// stretched shape). Using fontsize_expansion only here broke setting the style via font
+// dialog. This needs to be investigated further.
+    double const ex = NR::expansion(xform);
+    if (ex == 0) {
+        return xform;
+    }
+
+    NR::Matrix ret(NR::transform(xform));
+    ret[0] /= ex;
+    ret[1] /= ex;
+    ret[2] /= ex;
+    ret[3] /= ex;
+
+    // Adjust x/y, dx/dy
+    text->_adjustCoordsRecursive (item, xform * ret.inverse(), ex);
+
+    // Adjust font size
+    text->_adjustFontsizeRecursive (item, ex);
+
+    // Adjust stroke width
+    sp_item_adjust_stroke_width_recursive (item, ex);
+
+    // Adjust pattern fill
+    sp_item_adjust_pattern(item, xform * ret.inverse());
+
+    // Adjust gradient fill
+    sp_item_adjust_gradient(item, xform * ret.inverse());
+
+    item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_TEXT_LAYOUT_MODIFIED_FLAG);
+
+    return ret;
+}
+
+static void
+sp_text_print (SPItem *item, SPPrintContext *ctx)
+{
+    NRRect     pbox, dbox, bbox;
+    SPText *group = SP_TEXT (item);
+
+    sp_item_invoke_bbox(item, &pbox, NR::identity(), TRUE);
+    sp_item_bbox_desktop (item, &bbox);
+    dbox.x0 = 0.0;
+    dbox.y0 = 0.0;
+    dbox.x1 = sp_document_width (SP_OBJECT_DOCUMENT (item));
+    dbox.y1 = sp_document_height (SP_OBJECT_DOCUMENT (item));
+    NR::Matrix const ctm = sp_item_i2d_affine(item);
+
+    group->layout.print(ctx,&pbox,&dbox,&bbox,ctm);
+}
+
+/*
+ * Member functions
+ */
+
+unsigned SPText::_buildLayoutInput(SPObject *root, Inkscape::Text::Layout::OptionalTextTagAttrs const &parent_optional_attrs, unsigned parent_attrs_offset, bool in_textpath)
+{
+    unsigned length = 0;
+    int child_attrs_offset = 0;
+    Inkscape::Text::Layout::OptionalTextTagAttrs optional_attrs;
+
+    if (SP_IS_TEXT(root)) {
+        SP_TEXT(root)->attributes.mergeInto(&optional_attrs, parent_optional_attrs, parent_attrs_offset, true, true);
+    }
+    else if (SP_IS_TSPAN(root)) {
+        SPTSpan *tspan = SP_TSPAN(root);
+        bool use_xy = !in_textpath && (tspan->role == SP_TSPAN_ROLE_UNSPECIFIED || !tspan->attributes.singleXYCoordinates());
+        tspan->attributes.mergeInto(&optional_attrs, parent_optional_attrs, parent_attrs_offset, use_xy, true);
+    }
+    else if (SP_IS_TEXTPATH(root)) {
+        in_textpath = true;
+        SP_TEXTPATH(root)->attributes.mergeInto(&optional_attrs, parent_optional_attrs, parent_attrs_offset, false, true);
+        optional_attrs.x.clear();
+        optional_attrs.y.clear();
+    }
+    else {
+        optional_attrs = parent_optional_attrs;
+        child_attrs_offset = parent_attrs_offset;
+    }
+
+    if (SP_IS_TSPAN(root))
+        if (SP_TSPAN(root)->role != SP_TSPAN_ROLE_UNSPECIFIED) {
+            // we need to allow the first line not to have role=line, but still set the source_cookie to the right value
+            SPObject *prev_object = SP_OBJECT_PREV(root);
+            if (prev_object && SP_IS_TSPAN(prev_object)) {
+                if (!layout.inputExists())
+                    layout.appendText("", prev_object->style, prev_object, &optional_attrs);
+                layout.appendControlCode(Inkscape::Text::Layout::PARAGRAPH_BREAK, prev_object);
+            }
+            if (!root->hasChildren())
+                layout.appendText("", root->style, root, &optional_attrs);
+            length++;     // interpreting line breaks as a character for the purposes of x/y/etc attributes
+                          // is a liberal interpretation of the svg spec, but a strict reading would mean
+                          // that if the first line is empty the second line would take its place at the
+                          // start position. Very confusing.
+            child_attrs_offset--;
+        }
+
+    for (SPObject *child = sp_object_first_child(root) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+        if (SP_IS_STRING(child)) {
+            Glib::ustring const &string = SP_STRING(child)->string;
+            layout.appendText(string, root->style, child, &optional_attrs, child_attrs_offset + length);
+            length += string.length();
+        } else {
+            length += _buildLayoutInput(child, optional_attrs, child_attrs_offset + length, in_textpath);
+        }
+    }
+
+    return length;
+}
+
+void SPText::rebuildLayout()
+{
+    layout.clear();
+    Inkscape::Text::Layout::OptionalTextTagAttrs optional_attrs;
+    _buildLayoutInput(this, optional_attrs, 0, false);
+    layout.calculateFlow();
+    for (SPObject *child = firstChild() ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+        if (SP_IS_TEXTPATH(child)) {
+            SPTextPath const *textpath = SP_TEXTPATH(child);
+            if (textpath->originalPath != NULL) {
+                //g_print(layout.dumpAsText().c_str());
+                layout.fitToPathAlign(textpath->startOffset, *textpath->originalPath);
+            }
+        }
+    }
+    //g_print(layout.dumpAsText().c_str());
+
+    // set the x,y attributes on role:line spans
+    for (SPObject *child = firstChild() ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
+        if (!SP_IS_TSPAN(child)) continue;
+        SPTSpan *tspan = SP_TSPAN(child);
+        if (tspan->role == SP_TSPAN_ROLE_UNSPECIFIED) continue;
+        if (!tspan->attributes.singleXYCoordinates()) continue;
+        Inkscape::Text::Layout::iterator iter = layout.sourceToIterator(tspan);
+        NR::Point anchor_point = layout.chunkAnchorPoint(iter);
+        sp_repr_set_svg_double(SP_OBJECT_REPR(tspan), "x", anchor_point[NR::X]);
+        sp_repr_set_svg_double(SP_OBJECT_REPR(tspan), "y", anchor_point[NR::Y]);
+    }
+}
+
+
+void SPText::_adjustFontsizeRecursive(SPItem *item, double ex, bool is_root)
+{
+    SPStyle *style = SP_OBJECT_STYLE (item);
+
+    if (style && !NR_DF_TEST_CLOSE (ex, 1.0, NR_EPSILON)) {
+        if (!style->font_size.set && is_root) {
+            style->font_size.set = 1;
+            style->font_size.type = SP_FONT_SIZE_LENGTH;
+        }
+        style->font_size.computed *= ex;
+        style->letter_spacing.computed *= ex;
+        style->word_spacing.computed *= ex;
+        item->updateRepr();
+    }
+
+    for (SPObject *o = item->children; o != NULL; o = o->next) {
+        if (SP_IS_ITEM(o))
+            _adjustFontsizeRecursive(SP_ITEM(o), ex, false);
+    }
+}
+
+void SPText::_adjustCoordsRecursive(SPItem *item, NR::Matrix const &m, double ex, bool is_root)
+{
+    if (SP_IS_TSPAN(item))
+        SP_TSPAN(item)->attributes.transform(m, ex, ex, is_root);
+              // it doesn't matter if we change the x,y for role=line spans because we'll just overwrite them anyway
+    else if (SP_IS_TEXT(item))
+        SP_TEXT(item)->attributes.transform(m, ex, ex, is_root);
+    else if (SP_IS_TEXTPATH(item))
+        SP_TEXTPATH(item)->attributes.transform(m, ex, ex, is_root);
+
+    for (SPObject *o = item->children; o != NULL; o = o->next) {
+        if (SP_IS_ITEM(o))
+            _adjustCoordsRecursive(SP_ITEM(o), m, ex, false);
+    }
+}
+
+
+void SPText::_clearFlow(NRArenaGroup *in_arena)
+{
+    nr_arena_item_request_render (in_arena);
+    for (NRArenaItem *child = in_arena->children; child != NULL; ) {
+        NRArenaItem *nchild = child->next;
+
+        nr_arena_glyphs_group_clear(NR_ARENA_GLYPHS_GROUP(child));
+        nr_arena_item_remove_child (in_arena, child);
+
+        child=nchild;
+    }
+}
+
+
+/*
+ * TextTagAttributes implementation
+ */
+
+void TextTagAttributes::readFrom(Inkscape::XML::Node const *node)
+{
+    readSingleAttribute(SP_ATTR_X, node->attribute("x"));
+    readSingleAttribute(SP_ATTR_Y, node->attribute("y"));
+    readSingleAttribute(SP_ATTR_DX, node->attribute("dx"));
+    readSingleAttribute(SP_ATTR_DY, node->attribute("dy"));
+    readSingleAttribute(SP_ATTR_ROTATE, node->attribute("rotate"));
+}
+
+bool TextTagAttributes::readSingleAttribute(unsigned key, gchar const *value)
+{
+    std::vector<SVGLength> *attr_vector;
+    switch (key) {
+        case SP_ATTR_X:      attr_vector = &attributes.x; break;
+        case SP_ATTR_Y:      attr_vector = &attributes.y; break;
+        case SP_ATTR_DX:     attr_vector = &attributes.dx; break;
+        case SP_ATTR_DY:     attr_vector = &attributes.dy; break;
+        case SP_ATTR_ROTATE: attr_vector = &attributes.rotate; break;
+        default: return false;
+    }
+
+    // FIXME: sp_svg_length_list_read() amalgamates repeated separators. This prevents unset values.
+    *attr_vector = sp_svg_length_list_read(value);
+    return true;
+}
+
+void TextTagAttributes::writeTo(Inkscape::XML::Node *node) const
+{
+    writeSingleAttribute(node, "x", attributes.x);
+    writeSingleAttribute(node, "y", attributes.y);
+    writeSingleAttribute(node, "dx", attributes.dx);
+    writeSingleAttribute(node, "dy", attributes.dy);
+    writeSingleAttribute(node, "rotate", attributes.rotate);
+}
+
+void TextTagAttributes::writeSingleAttribute(Inkscape::XML::Node *node, gchar const *key, std::vector<SVGLength> const &attr_vector)
+{
+    if (attr_vector.empty())
+        node->setAttribute(key, NULL);
+    else {
+        Glib::ustring string;
+        gchar single_value_string[32];
+
+        // FIXME: this has no concept of unset values because sp_svg_length_list_read() can't read them back in
+        for (std::vector<SVGLength>::const_iterator it = attr_vector.begin() ; it != attr_vector.end() ; it++) {
+            g_ascii_formatd(single_value_string, sizeof (single_value_string), "%.8g", it->computed);
+            if (!string.empty()) string += ' ';
+            string += single_value_string;
+        }
+        node->setAttribute(key, string.c_str());
+    }
+}
+
+bool TextTagAttributes::singleXYCoordinates() const
+{
+    return attributes.x.size() <= 1 && attributes.y.size() <= 1;
+}
+
+bool TextTagAttributes::anyAttributesSet() const
+{
+    return !attributes.x.empty() || !attributes.y.empty() || !attributes.dx.empty() || !attributes.dy.empty() || !attributes.rotate.empty();
+}
+
+NR::Point TextTagAttributes::firstXY() const
+{
+    NR::Point point;
+    if (attributes.x.empty()) point[NR::X] = 0.0;
+    else point[NR::X] = attributes.x[0].computed;
+    if (attributes.y.empty()) point[NR::Y] = 0.0;
+    else point[NR::Y] = attributes.y[0].computed;
+    return point;
+}
+
+void TextTagAttributes::mergeInto(Inkscape::Text::Layout::OptionalTextTagAttrs *output, Inkscape::Text::Layout::OptionalTextTagAttrs const &parent_attrs, unsigned parent_attrs_offset, bool copy_xy, bool copy_dxdyrotate) const
+{
+    mergeSingleAttribute(&output->x,      parent_attrs.x,      parent_attrs_offset, copy_xy ? &attributes.x : NULL);
+    mergeSingleAttribute(&output->y,      parent_attrs.y,      parent_attrs_offset, copy_xy ? &attributes.y : NULL);
+    mergeSingleAttribute(&output->dx,     parent_attrs.dx,     parent_attrs_offset, copy_dxdyrotate ? &attributes.dx : NULL);
+    mergeSingleAttribute(&output->dy,     parent_attrs.dy,     parent_attrs_offset, copy_dxdyrotate ? &attributes.dy : NULL);
+    mergeSingleAttribute(&output->rotate, parent_attrs.rotate, parent_attrs_offset, copy_dxdyrotate ? &attributes.rotate : NULL);
+}
+
+void TextTagAttributes::mergeSingleAttribute(std::vector<SVGLength> *output_list, std::vector<SVGLength> const &parent_list, unsigned parent_offset, std::vector<SVGLength> const *overlay_list)
+{
+    if (overlay_list == NULL) {
+        output_list->resize(std::max(0, (int)parent_list.size() - (int)parent_offset));
+        std::copy(parent_list.begin() + parent_offset, parent_list.end(), output_list->begin());
+    } else {
+        output_list->clear();
+        output_list->reserve(std::max((int)parent_list.size() - (int)parent_offset, (int)overlay_list->size()));
+        unsigned overlay_offset = 0;
+        while (parent_offset < parent_list.size() || overlay_offset < overlay_list->size()) {
+            SVGLength const *this_item;
+            if (overlay_offset < overlay_list->size()) {
+                this_item = &(*overlay_list)[overlay_offset];
+                overlay_offset++;
+                parent_offset++;
+            } else {
+                this_item = &parent_list[parent_offset];
+                parent_offset++;
+            }
+            output_list->push_back(*this_item);
+        }
+    }
+}
+
+void TextTagAttributes::erase(unsigned start_index, unsigned n)
+{
+    if (n == 0) return;
+    if (!singleXYCoordinates()) {
+        eraseSingleAttribute(&attributes.x, start_index, n);
+        eraseSingleAttribute(&attributes.y, start_index, n);
+    }
+    eraseSingleAttribute(&attributes.dx, start_index, n);
+    eraseSingleAttribute(&attributes.dy, start_index, n);
+    eraseSingleAttribute(&attributes.rotate, start_index, n);
+}
+
+void TextTagAttributes::eraseSingleAttribute(std::vector<SVGLength> *attr_vector, unsigned start_index, unsigned n)
+{
+    if (attr_vector->size() <= start_index) return;
+    if (attr_vector->size() <= start_index + n)
+        attr_vector->erase(attr_vector->begin() + start_index, attr_vector->end());
+    else
+        attr_vector->erase(attr_vector->begin() + start_index, attr_vector->begin() + start_index + n);
+}
+
+void TextTagAttributes::insert(unsigned start_index, unsigned n)
+{
+    if (n == 0) return;
+    if (!singleXYCoordinates()) {
+        insertSingleAttribute(&attributes.x, start_index, n, true);
+        insertSingleAttribute(&attributes.y, start_index, n, true);
+    }
+    insertSingleAttribute(&attributes.dx, start_index, n, false);
+    insertSingleAttribute(&attributes.dy, start_index, n, false);
+    insertSingleAttribute(&attributes.rotate, start_index, n, false);
+}
+
+void TextTagAttributes::insertSingleAttribute(std::vector<SVGLength> *attr_vector, unsigned start_index, unsigned n, bool is_xy)
+{
+    if (attr_vector->size() <= start_index) return;
+    SVGLength zero_length;
+    zero_length = 0.0;
+    attr_vector->insert(attr_vector->begin() + start_index, n, zero_length);
+    if (is_xy) {
+        double begin = start_index == 0 ? (*attr_vector)[start_index + n].computed : (*attr_vector)[start_index - 1].computed;
+        double diff = ((*attr_vector)[start_index + n].computed - begin) / n;   // n tested for nonzero in insert()
+        for (unsigned i = 0 ; i < n ; i++)
+            (*attr_vector)[start_index + i] = begin + diff * i;
+    }
+}
+
+void TextTagAttributes::split(unsigned index, TextTagAttributes *second)
+{
+    if (!singleXYCoordinates()) {
+        splitSingleAttribute(&attributes.x, index, &second->attributes.x, false);
+        splitSingleAttribute(&attributes.y, index, &second->attributes.y, false);
+    }
+    splitSingleAttribute(&attributes.dx, index, &second->attributes.dx, true);
+    splitSingleAttribute(&attributes.dy, index, &second->attributes.dy, true);
+    splitSingleAttribute(&attributes.rotate, index, &second->attributes.rotate, true);
+}
+
+void TextTagAttributes::splitSingleAttribute(std::vector<SVGLength> *first_vector, unsigned index, std::vector<SVGLength> *second_vector, bool trimZeros)
+{
+    second_vector->clear();
+    if (first_vector->size() <= index) return;
+    second_vector->resize(first_vector->size() - index);
+    std::copy(first_vector->begin() + index, first_vector->end(), second_vector->begin());
+    first_vector->resize(index);
+    if (trimZeros)
+        while (!first_vector->empty() && (!first_vector->back()._set || first_vector->back().value == 0.0))
+            first_vector->resize(first_vector->size() - 1);
+}
+
+void TextTagAttributes::join(TextTagAttributes const &first, TextTagAttributes const &second, unsigned second_index)
+{
+    if (second.singleXYCoordinates()) {
+        attributes.x = first.attributes.x;
+        attributes.y = first.attributes.y;
+    } else {
+        joinSingleAttribute(&attributes.x, first.attributes.x, second.attributes.x, second_index);
+        joinSingleAttribute(&attributes.y, first.attributes.y, second.attributes.y, second_index);
+    }
+    joinSingleAttribute(&attributes.dx, first.attributes.dx, second.attributes.dx, second_index);
+    joinSingleAttribute(&attributes.dy, first.attributes.dy, second.attributes.dy, second_index);
+    joinSingleAttribute(&attributes.rotate, first.attributes.rotate, second.attributes.rotate, second_index);
+}
+
+void TextTagAttributes::joinSingleAttribute(std::vector<SVGLength> *dest_vector, std::vector<SVGLength> const &first_vector, std::vector<SVGLength> const &second_vector, unsigned second_index)
+{
+    if (second_vector.empty())
+        *dest_vector = first_vector;
+    else {
+        dest_vector->resize(second_index + second_vector.size());
+        if (first_vector.size() < second_index) {
+            std::copy(first_vector.begin(), first_vector.end(), dest_vector->begin());
+            SVGLength zero_length;
+            zero_length = 0.0;
+            std::fill(dest_vector->begin() + first_vector.size(), dest_vector->begin() + second_index, zero_length);
+        } else
+            std::copy(first_vector.begin(), first_vector.begin() + second_index, dest_vector->begin());
+        std::copy(second_vector.begin(), second_vector.end(), dest_vector->begin() + second_index);
+    }
+}
+
+void TextTagAttributes::transform(NR::Matrix const &matrix, double scale_x, double scale_y, bool extend_zero_length)
+{
+    SVGLength zero_length;
+    zero_length = 0.0;
+
+    /* edge testcases for this code:
+       1) moving text elements whose position is done entirely with transform="...", no x,y attributes
+       2) unflowing multi-line flowtext then moving it (it has x but not y)
+    */
+    unsigned points_count = std::max(attributes.x.size(), attributes.y.size());
+    if (extend_zero_length && points_count < 1)
+        points_count = 1;
+    for (unsigned i = 0 ; i < points_count ; i++) {
+        NR::Point point;
+        if (i < attributes.x.size()) point[NR::X] = attributes.x[i].computed;
+        else point[NR::X] = 0.0;
+        if (i < attributes.y.size()) point[NR::Y] = attributes.y[i].computed;
+        else point[NR::Y] = 0.0;
+        point *= matrix;
+        if (i < attributes.x.size())
+            attributes.x[i] = point[NR::X];
+        else if (point[NR::X] != 0.0 && extend_zero_length) {
+            attributes.x.resize(i + 1, zero_length);
+            attributes.x[i] = point[NR::X];
+        }
+        if (i < attributes.y.size())
+            attributes.y[i] = point[NR::Y];
+        else if (point[NR::Y] != 0.0 && extend_zero_length) {
+            attributes.y.resize(i + 1, zero_length);
+            attributes.y[i] = point[NR::Y];
+        }
+    }
+    for (std::vector<SVGLength>::iterator it = attributes.dx.begin() ; it != attributes.dx.end() ; it++)
+        *it = it->computed * scale_x;
+    for (std::vector<SVGLength>::iterator it = attributes.dy.begin() ; it != attributes.dy.end() ; it++)
+        *it = it->computed * scale_y;
+}
+
+void TextTagAttributes::addToDxDy(unsigned index, NR::Point const &adjust)
+{
+    SVGLength zero_length;
+    zero_length = 0.0;
+
+    if (adjust[NR::X] != 0.0) {
+        if (attributes.dx.size() < index + 1) attributes.dx.resize(index + 1, zero_length);
+        attributes.dx[index] = attributes.dx[index].computed + adjust[NR::X];
+    }
+    if (adjust[NR::Y] != 0.0) {
+        if (attributes.dy.size() < index + 1) attributes.dy.resize(index + 1, zero_length);
+        attributes.dy[index] = attributes.dy[index].computed + adjust[NR::Y];
+    }
+}
+
+void TextTagAttributes::addToRotate(unsigned index, double delta)
+{
+    SVGLength zero_length;
+    zero_length = 0.0;
+
+    if (attributes.rotate.size() < index + 1) {
+        if (attributes.rotate.empty())
+            attributes.rotate.resize(index + 1, zero_length);
+        else
+            attributes.rotate.resize(index + 1, attributes.rotate.back());
+    }
+    attributes.rotate[index] = mod360(attributes.rotate[index].computed + delta);
+}
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :