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Diffstat (limited to 'src/object/sp-gradient.cpp')
| -rw-r--r-- | src/object/sp-gradient.cpp | 1208 |
1 files changed, 1208 insertions, 0 deletions
diff --git a/src/object/sp-gradient.cpp b/src/object/sp-gradient.cpp new file mode 100644 index 0000000..71b1447 --- /dev/null +++ b/src/object/sp-gradient.cpp @@ -0,0 +1,1208 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * SPGradient, SPStop, SPLinearGradient, SPRadialGradient, + * SPMeshGradient, SPMeshRow, SPMeshPatch + */ +/* + * Authors: + * Lauris Kaplinski <lauris@kaplinski.com> + * bulia byak <buliabyak@users.sf.net> + * Jasper van de Gronde <th.v.d.gronde@hccnet.nl> + * Jon A. Cruz <jon@joncruz.org> + * Abhishek Sharma + * Tavmjong Bah <tavmjong@free.fr> + * + * Copyright (C) 1999-2002 Lauris Kaplinski + * Copyright (C) 2000-2001 Ximian, Inc. + * Copyright (C) 2004 David Turner + * Copyright (C) 2009 Jasper van de Gronde + * Copyright (C) 2011 Tavmjong Bah + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + * + */ + +#define noSP_GRADIENT_VERBOSE +//#define OBJECT_TRACE + +#include "sp-gradient.h" + +#include <cstring> +#include <string> + +#include <2geom/transforms.h> + +#include <cairo.h> + +#include <sigc++/functors/ptr_fun.h> +#include <sigc++/adaptors/bind.h> + +#include "attributes.h" +#include "bad-uri-exception.h" +#include "document.h" +#include "gradient-chemistry.h" + +#include "sp-gradient-reference.h" +#include "sp-linear-gradient.h" +#include "sp-radial-gradient.h" +#include "sp-mesh-gradient.h" +#include "sp-mesh-row.h" +#include "sp-mesh-patch.h" +#include "sp-stop.h" + +#include "display/cairo-utils.h" + +#include "svg/svg.h" +#include "svg/css-ostringstream.h" + +bool SPGradient::hasStops() const +{ + return has_stops; +} + +bool SPGradient::hasPatches() const +{ + return has_patches; +} + +bool SPGradient::isUnitsSet() const +{ + return units_set; +} + +SPGradientUnits SPGradient::getUnits() const +{ + return units; +} + +bool SPGradient::isSpreadSet() const +{ + return spread_set; +} + +SPGradientSpread SPGradient::getSpread() const +{ + return spread; +} + +void SPGradient::setSwatch( bool swatch ) +{ + if ( swatch != isSwatch() ) { + this->swatch = swatch; // to make isSolid() work, this happens first + gchar const* paintVal = swatch ? (isSolid() ? "solid" : "gradient") : nullptr; + setAttribute( "inkscape:swatch", paintVal); + + requestModified( SP_OBJECT_MODIFIED_FLAG ); + } +} + + +/** + * return true if this gradient is "equivalent" to that gradient. + * Equivalent meaning they have the same stop count, same stop colors and same stop opacity + * @param that - A gradient to compare this to + */ +bool SPGradient::isEquivalent(SPGradient *that) +{ + //TODO Make this work for mesh gradients + + bool status = false; + + while(true){ // not really a loop, used to avoid deep nesting or multiple exit points from function + if (this->getStopCount() != that->getStopCount()) { break; } + if (this->hasStops() != that->hasStops()) { break; } + if (!this->getVector() || !that->getVector()) { break; } + if (this->isSwatch() != that->isSwatch()) { break; } + if ( this->isSwatch() ){ + // drop down to check stops. + } + else if ( + (SP_IS_LINEARGRADIENT(this) && SP_IS_LINEARGRADIENT(that)) || + (SP_IS_RADIALGRADIENT(this) && SP_IS_RADIALGRADIENT(that)) || + (SP_IS_MESHGRADIENT(this) && SP_IS_MESHGRADIENT(that))) { + if(!this->isAligned(that))break; + } + else { break; } // this should never happen, some unhandled type of gradient + + SPStop *as = this->getVector()->getFirstStop(); + SPStop *bs = that->getVector()->getFirstStop(); + + bool effective = true; + while (effective && (as && bs)) { + if (!as->getColor().isClose(bs->getColor(), 0.001) || + as->offset != bs->offset || as->getOpacity() != bs->getOpacity() ) { + effective = false; + break; + } + else { + as = as->getNextStop(); + bs = bs->getNextStop(); + } + } + if (!effective) break; + + status = true; + break; + } + return status; +} + +/** + * return true if this gradient is "aligned" to that gradient. + * Aligned means that they have exactly the same coordinates and transform. + * @param that - A gradient to compare this to + */ +bool SPGradient::isAligned(SPGradient *that) +{ + bool status = false; + + /* Some gradients have coordinates/other values specified, some don't. + yes/yes check the coordinates/other values + no/no aligned (because both have all default values) + yes/no not aligned + no/yes not aligned + It is NOT safe to just compare the computed values because if that field has + not been set the computed value could be full of garbage. + + In theory the yes/no and no/yes cases could be aligned if the specified value + matches the default value. + */ + + while(true){ // not really a loop, used to avoid deep nesting or multiple exit points from function + if(this->gradientTransform_set != that->gradientTransform_set) { break; } + if(this->gradientTransform_set && + (this->gradientTransform != that->gradientTransform)) { break; } + if (SP_IS_LINEARGRADIENT(this) && SP_IS_LINEARGRADIENT(that)) { + SPLinearGradient *sg=SP_LINEARGRADIENT(this); + SPLinearGradient *tg=SP_LINEARGRADIENT(that); + + if( sg->x1._set != tg->x1._set) { break; } + if( sg->y1._set != tg->y1._set) { break; } + if( sg->x2._set != tg->x2._set) { break; } + if( sg->y2._set != tg->y2._set) { break; } + if( sg->x1._set && sg->y1._set && sg->x2._set && sg->y2._set) { + if( (sg->x1.computed != tg->x1.computed) || + (sg->y1.computed != tg->y1.computed) || + (sg->x2.computed != tg->x2.computed) || + (sg->y2.computed != tg->y2.computed) ) { break; } + } else if( sg->x1._set || sg->y1._set || sg->x2._set || sg->y2._set) { break; } // some mix of set and not set + // none set? assume aligned and fall through + } else if (SP_IS_RADIALGRADIENT(this) && SP_IS_LINEARGRADIENT(that)) { + SPRadialGradient *sg=SP_RADIALGRADIENT(this); + SPRadialGradient *tg=SP_RADIALGRADIENT(that); + + if( sg->cx._set != tg->cx._set) { break; } + if( sg->cy._set != tg->cy._set) { break; } + if( sg->r._set != tg->r._set) { break; } + if( sg->fx._set != tg->fx._set) { break; } + if( sg->fy._set != tg->fy._set) { break; } + if( sg->cx._set && sg->cy._set && sg->fx._set && sg->fy._set && sg->r._set) { + if( (sg->cx.computed != tg->cx.computed) || + (sg->cy.computed != tg->cy.computed) || + (sg->r.computed != tg->r.computed ) || + (sg->fx.computed != tg->fx.computed) || + (sg->fy.computed != tg->fy.computed) ) { break; } + } else if( sg->cx._set || sg->cy._set || sg->fx._set || sg->fy._set || sg->r._set ) { break; } // some mix of set and not set + // none set? assume aligned and fall through + } else if (SP_IS_MESHGRADIENT(this) && SP_IS_MESHGRADIENT(that)) { + SPMeshGradient *sg=SP_MESHGRADIENT(this); + SPMeshGradient *tg=SP_MESHGRADIENT(that); + + if( sg->x._set != !tg->x._set) { break; } + if( sg->y._set != !tg->y._set) { break; } + if( sg->x._set && sg->y._set) { + if( (sg->x.computed != tg->x.computed) || + (sg->y.computed != tg->y.computed) ) { break; } + } else if( sg->x._set || sg->y._set) { break; } // some mix of set and not set + // none set? assume aligned and fall through + } else { + break; + } + status = true; + break; + } + return status; +} + +/* + * Gradient + */ +SPGradient::SPGradient() : SPPaintServer(), units(), + spread(), + ref(nullptr), + state(2), + vector() { + + this->ref = new SPGradientReference(this); + this->ref->changedSignal().connect(sigc::bind(sigc::ptr_fun(SPGradient::gradientRefChanged), this)); + + /** \todo + * Fixme: reprs being rearranged (e.g. via the XML editor) + * may require us to clear the state. + */ + this->state = SP_GRADIENT_STATE_UNKNOWN; + + this->units = SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX; + this->units_set = FALSE; + + this->gradientTransform = Geom::identity(); + this->gradientTransform_set = FALSE; + + this->spread = SP_GRADIENT_SPREAD_PAD; + this->spread_set = FALSE; + + this->has_stops = FALSE; + this->has_patches = FALSE; + + this->vector.built = false; + this->vector.stops.clear(); +} + +SPGradient::~SPGradient() = default; + +/** + * Virtual build: set gradient attributes from its associated repr. + */ +void SPGradient::build(SPDocument *document, Inkscape::XML::Node *repr) +{ + // Work-around in case a swatch had been marked for immediate collection: + if ( repr->attribute("inkscape:swatch") && repr->attribute("inkscape:collect") ) { + repr->removeAttribute("inkscape:collect"); + } + + this->readAttr(SPAttr::STYLE); + + SPPaintServer::build(document, repr); + + for (auto& ochild: children) { + if (SP_IS_STOP(&ochild)) { + this->has_stops = TRUE; + break; + } + if (SP_IS_MESHROW(&ochild)) { + for (auto& ochild2: ochild.children) { + if (SP_IS_MESHPATCH(&ochild2)) { + this->has_patches = TRUE; + break; + } + } + if (this->has_patches == TRUE) { + break; + } + } + } + + this->readAttr(SPAttr::GRADIENTUNITS); + this->readAttr(SPAttr::GRADIENTTRANSFORM); + this->readAttr(SPAttr::SPREADMETHOD); + this->readAttr(SPAttr::XLINK_HREF); + this->readAttr(SPAttr::INKSCAPE_SWATCH); + + // Register ourselves + document->addResource("gradient", this); +} + +/** + * Virtual release of SPGradient members before destruction. + */ +void SPGradient::release() +{ + +#ifdef SP_GRADIENT_VERBOSE + g_print("Releasing this %s\n", this->getId()); +#endif + + if (this->document) { + // Unregister ourselves + this->document->removeResource("gradient", this); + } + + if (this->ref) { + this->modified_connection.disconnect(); + this->ref->detach(); + delete this->ref; + this->ref = nullptr; + } + + //this->modified_connection.~connection(); + + SPPaintServer::release(); +} + +/** + * Set gradient attribute to value. + */ +void SPGradient::set(SPAttr key, gchar const *value) +{ +#ifdef OBJECT_TRACE + std::stringstream temp; + temp << "SPGradient::set: " << sp_attribute_name(key) << " " << (value?value:"null"); + objectTrace( temp.str() ); +#endif + + switch (key) { + case SPAttr::GRADIENTUNITS: + if (value) { + if (!strcmp(value, "userSpaceOnUse")) { + this->units = SP_GRADIENT_UNITS_USERSPACEONUSE; + } else { + this->units = SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX; + } + + this->units_set = TRUE; + } else { + this->units = SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX; + this->units_set = FALSE; + } + + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + break; + + case SPAttr::GRADIENTTRANSFORM: { + Geom::Affine t; + if (value && sp_svg_transform_read(value, &t)) { + this->gradientTransform = t; + this->gradientTransform_set = TRUE; + } else { + this->gradientTransform = Geom::identity(); + this->gradientTransform_set = FALSE; + } + + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + break; + } + case SPAttr::SPREADMETHOD: + if (value) { + if (!strcmp(value, "reflect")) { + this->spread = SP_GRADIENT_SPREAD_REFLECT; + } else if (!strcmp(value, "repeat")) { + this->spread = SP_GRADIENT_SPREAD_REPEAT; + } else { + this->spread = SP_GRADIENT_SPREAD_PAD; + } + + this->spread_set = TRUE; + } else { + this->spread_set = FALSE; + } + + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + break; + + case SPAttr::XLINK_HREF: + if (value) { + try { + this->ref->attach(Inkscape::URI(value)); + } catch (Inkscape::BadURIException &e) { + g_warning("%s", e.what()); + this->ref->detach(); + } + } else { + this->ref->detach(); + } + break; + + case SPAttr::INKSCAPE_SWATCH: + { + bool newVal = (value != nullptr); + bool modified = false; + + if (newVal != this->swatch) { + this->swatch = newVal; + modified = true; + } + + if (newVal) { + // Might need to flip solid/gradient + Glib::ustring paintVal = ( this->hasStops() && (this->getStopCount() <= 1) ) ? "solid" : "gradient"; + + if ( paintVal != value ) { + this->setAttribute( "inkscape:swatch", paintVal); + modified = true; + } + } + + if (modified) { + this->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + } + break; + default: + SPPaintServer::set(key, value); + break; + } + +#ifdef OBJECT_TRACE + objectTrace( "SPGradient::set", false ); +#endif +} + +/** + * Gets called when the gradient is (re)attached to another gradient. + */ +void SPGradient::gradientRefChanged(SPObject *old_ref, SPObject *ref, SPGradient *gr) +{ + if (old_ref) { + gr->modified_connection.disconnect(); + } + if ( SP_IS_GRADIENT(ref) + && ref != gr ) + { + gr->modified_connection = ref->connectModified(sigc::bind<2>(sigc::ptr_fun(&SPGradient::gradientRefModified), gr)); + } + + // Per SVG, all unset attributes must be inherited from linked gradient. + // So, as we're now (re)linked, we assign linkee's values to this gradient if they are not yet set - + // but without setting the _set flags. + // FIXME: do the same for gradientTransform too + if (!gr->units_set) { + gr->units = gr->fetchUnits(); + } + if (!gr->spread_set) { + gr->spread = gr->fetchSpread(); + } + + /// \todo Fixme: what should the flags (second) argument be? */ + gradientRefModified(ref, 0, gr); +} + +/** + * Callback for child_added event. + */ +void SPGradient::child_added(Inkscape::XML::Node *child, Inkscape::XML::Node *ref) +{ + this->invalidateVector(); + + SPPaintServer::child_added(child, ref); + + SPObject *ochild = this->get_child_by_repr(child); + if ( ochild && SP_IS_STOP(ochild) ) { + this->has_stops = TRUE; + if ( this->getStopCount() > 1 ) { + gchar const * attr = this->getAttribute("inkscape:swatch"); + if ( attr && strcmp(attr, "gradient") ) { + this->setAttribute( "inkscape:swatch", "gradient" ); + } + } + } + if ( ochild && SP_IS_MESHROW(ochild) ) { + this->has_patches = TRUE; + } + + /// \todo Fixme: should we schedule "modified" here? + this->requestModified(SP_OBJECT_MODIFIED_FLAG); +} + +/** + * Callback for remove_child event. + */ +void SPGradient::remove_child(Inkscape::XML::Node *child) +{ + this->invalidateVector(); + + SPPaintServer::remove_child(child); + + this->has_stops = FALSE; + this->has_patches = FALSE; + for (auto& ochild: children) { + if (SP_IS_STOP(&ochild)) { + this->has_stops = TRUE; + break; + } + if (SP_IS_MESHROW(&ochild)) { + for (auto& ochild2: ochild.children) { + if (SP_IS_MESHPATCH(&ochild2)) { + this->has_patches = TRUE; + break; + } + } + if (this->has_patches == TRUE) { + break; + } + } + } + + if ( this->getStopCount() <= 1 ) { + gchar const * attr = this->getAttribute("inkscape:swatch"); + + if ( attr && strcmp(attr, "solid") ) { + this->setAttribute( "inkscape:swatch", "solid" ); + } + } + + /* Fixme: should we schedule "modified" here? */ + this->requestModified(SP_OBJECT_MODIFIED_FLAG); +} + +/** + * Callback for modified event. + */ +void SPGradient::modified(guint flags) +{ +#ifdef OBJECT_TRACE + objectTrace( "SPGradient::modified" ); +#endif + if (flags & SP_OBJECT_CHILD_MODIFIED_FLAG) { + if (SP_IS_MESHGRADIENT(this)) { + this->invalidateArray(); + } else { + this->invalidateVector(); + } + } + + if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) { + if (SP_IS_MESHGRADIENT(this)) { + this->ensureArray(); + } else { + this->ensureVector(); + } + } + + if (flags & SP_OBJECT_MODIFIED_FLAG) flags |= SP_OBJECT_PARENT_MODIFIED_FLAG; + flags &= SP_OBJECT_MODIFIED_CASCADE; + + // FIXME: climb up the ladder of hrefs + std::vector<SPObject *> l; + for (auto& child: children) { + sp_object_ref(&child); + l.push_back(&child); + } + + for (auto child:l) { + if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) { + child->emitModified(flags); + } + sp_object_unref(child); + } + +#ifdef OBJECT_TRACE + objectTrace( "SPGradient::modified", false ); +#endif +} + +SPStop* SPGradient::getFirstStop() +{ + SPStop* first = nullptr; + for (auto& ochild: children) { + if (SP_IS_STOP(&ochild)) { + first = SP_STOP(&ochild); + break; + } + } + return first; +} + +int SPGradient::getStopCount() const +{ + int count = 0; + // fixed off-by one count + SPStop *stop = const_cast<SPGradient*>(this)->getFirstStop(); + while (stop) { + count++; + stop = stop->getNextStop(); + } + + return count; +} + +/** + * Write gradient attributes to repr. + */ +Inkscape::XML::Node *SPGradient::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) +{ +#ifdef OBJECT_TRACE + objectTrace( "SPGradient::write" ); +#endif + + SPPaintServer::write(xml_doc, repr, flags); + + if (flags & SP_OBJECT_WRITE_BUILD) { + std::vector<Inkscape::XML::Node *> l; + + for (auto& child: children) { + Inkscape::XML::Node *crepr = child.updateRepr(xml_doc, nullptr, flags); + + if (crepr) { + l.push_back(crepr); + } + } + + for (auto i=l.rbegin();i!=l.rend();++i) { + repr->addChild(*i, nullptr); + Inkscape::GC::release(*i); + } + } + + if (this->ref->getURI()) { + auto uri_string = this->ref->getURI()->str(); + repr->setAttributeOrRemoveIfEmpty("xlink:href", uri_string); + } + + if ((flags & SP_OBJECT_WRITE_ALL) || this->units_set) { + switch (this->units) { + case SP_GRADIENT_UNITS_USERSPACEONUSE: + repr->setAttribute("gradientUnits", "userSpaceOnUse"); + break; + default: + repr->setAttribute("gradientUnits", "objectBoundingBox"); + break; + } + } + + if ((flags & SP_OBJECT_WRITE_ALL) || this->gradientTransform_set) { + auto c = sp_svg_transform_write(this->gradientTransform); + repr->setAttributeOrRemoveIfEmpty("gradientTransform", c); + } + + if ((flags & SP_OBJECT_WRITE_ALL) || this->spread_set) { + /* FIXME: Ensure that this->spread is the inherited value + * if !this->spread_set. Not currently happening: see SPGradient::modified. + */ + switch (this->spread) { + case SP_GRADIENT_SPREAD_REFLECT: + repr->setAttribute("spreadMethod", "reflect"); + break; + case SP_GRADIENT_SPREAD_REPEAT: + repr->setAttribute("spreadMethod", "repeat"); + break; + default: + repr->setAttribute("spreadMethod", "pad"); + break; + } + } + + if ( (flags & SP_OBJECT_WRITE_EXT) && this->isSwatch() ) { + if ( this->isSolid() ) { + repr->setAttribute( "inkscape:swatch", "solid" ); + } else { + repr->setAttribute( "inkscape:swatch", "gradient" ); + } + } else { + repr->removeAttribute("inkscape:swatch"); + } + +#ifdef OBJECT_TRACE + objectTrace( "SPGradient::write", false ); +#endif + return repr; +} + +/** + * Forces the vector to be built, if not present (i.e., changed). + * + * \pre SP_IS_GRADIENT(gradient). + */ +void SPGradient::ensureVector() +{ + if ( !vector.built ) { + rebuildVector(); + } +} + +/** + * Forces the array to be built, if not present (i.e., changed). + * + * \pre SP_IS_GRADIENT(gradient). + */ +void SPGradient::ensureArray() +{ + //std::cout << "SPGradient::ensureArray()" << std::endl; + if ( !array.built ) { + rebuildArray(); + } +} + +/** + * Set units property of gradient and emit modified. + */ +void SPGradient::setUnits(SPGradientUnits units) +{ + if (units != this->units) { + this->units = units; + units_set = TRUE; + requestModified(SP_OBJECT_MODIFIED_FLAG); + } +} + +/** + * Set spread property of gradient and emit modified. + */ +void SPGradient::setSpread(SPGradientSpread spread) +{ + if (spread != this->spread) { + this->spread = spread; + spread_set = TRUE; + requestModified(SP_OBJECT_MODIFIED_FLAG); + } +} + +/** + * Returns the first of {src, src-\>ref-\>getObject(), + * src-\>ref-\>getObject()-\>ref-\>getObject(),...} + * for which \a match is true, or NULL if none found. + * + * The raison d'être of this routine is that it correctly handles cycles in the href chain (e.g., if + * a gradient gives itself as its href, or if each of two gradients gives the other as its href). + * + * \pre SP_IS_GRADIENT(src). + */ +static SPGradient * +chase_hrefs(SPGradient *const src, bool (*match)(SPGradient const *)) +{ + g_return_val_if_fail(SP_IS_GRADIENT(src), NULL); + + /* Use a pair of pointers for detecting loops: p1 advances half as fast as p2. If there is a + loop, then once p1 has entered the loop, we'll detect it the next time the distance between + p1 and p2 is a multiple of the loop size. */ + SPGradient *p1 = src, *p2 = src; + bool do1 = false; + for (;;) { + if (match(p2)) { + return p2; + } + + p2 = p2->ref->getObject(); + if (!p2) { + return p2; + } + if (do1) { + p1 = p1->ref->getObject(); + } + do1 = !do1; + + if ( p2 == p1 ) { + /* We've been here before, so return NULL to indicate that no matching gradient found + * in the chain. */ + return nullptr; + } + } +} + +/** + * True if gradient has stops. + */ +static bool has_stopsFN(SPGradient const *gr) +{ + return gr->hasStops(); +} + +/** + * True if gradient has patches (i.e. a mesh). + */ +static bool has_patchesFN(SPGradient const *gr) +{ + return gr->hasPatches(); +} + +/** + * True if gradient has spread set. + */ +static bool has_spread_set(SPGradient const *gr) +{ + return gr->isSpreadSet(); +} + +/** + * True if gradient has units set. + */ +static bool +has_units_set(SPGradient const *gr) +{ + return gr->isUnitsSet(); +} + + +SPGradient *SPGradient::getVector(bool force_vector) +{ + SPGradient * src = chase_hrefs(this, has_stopsFN); + if (src == nullptr) { + src = this; + } + + if (force_vector) { + src = sp_gradient_ensure_vector_normalized(src); + } + return src; +} + +SPGradient *SPGradient::getArray(bool force_vector) +{ + SPGradient * src = chase_hrefs(this, has_patchesFN); + if (src == nullptr) { + src = this; + } + return src; +} + +/** + * Returns the effective spread of given gradient (climbing up the refs chain if needed). + * + * \pre SP_IS_GRADIENT(gradient). + */ +SPGradientSpread SPGradient::fetchSpread() +{ + SPGradient const *src = chase_hrefs(this, has_spread_set); + return ( src + ? src->spread + : SP_GRADIENT_SPREAD_PAD ); // pad is the default +} + +/** + * Returns the effective units of given gradient (climbing up the refs chain if needed). + * + * \pre SP_IS_GRADIENT(gradient). + */ +SPGradientUnits SPGradient::fetchUnits() +{ + SPGradient const *src = chase_hrefs(this, has_units_set); + return ( src + ? src->units + : SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX ); // bbox is the default +} + + +/** + * Clears the gradient's svg:stop children from its repr. + */ +void +SPGradient::repr_clear_vector() +{ + Inkscape::XML::Node *repr = getRepr(); + + /* Collect stops from original repr */ + std::vector<Inkscape::XML::Node *> l; + for (Inkscape::XML::Node *child = repr->firstChild() ; child != nullptr; child = child->next() ) { + if (!strcmp(child->name(), "svg:stop")) { + l.push_back(child); + } + } + /* Remove all stops */ + for (auto i=l.rbegin();i!=l.rend();++i) { + /** \todo + * fixme: This should work, unless we make gradient + * into generic group. + */ + sp_repr_unparent(*i); + } +} + +/** + * Writes the gradient's internal vector (whether from its own stops, or + * inherited from refs) into the gradient repr as svg:stop elements. + */ +void +SPGradient::repr_write_vector() +{ + Inkscape::XML::Document *xml_doc = document->getReprDoc(); + Inkscape::XML::Node *repr = getRepr(); + + /* We have to be careful, as vector may be our own, so construct repr list at first */ + std::vector<Inkscape::XML::Node *> l; + + for (auto & stop : vector.stops) { + Inkscape::CSSOStringStream os; + Inkscape::XML::Node *child = xml_doc->createElement("svg:stop"); + child->setAttributeCssDouble("offset", stop.offset); + /* strictly speaking, offset an SVG <number> rather than a CSS one, but exponents make no + * sense for offset proportions. */ + os << "stop-color:" << stop.color.toString() << ";stop-opacity:" << stop.opacity; + child->setAttribute("style", os.str()); + /* Order will be reversed here */ + l.push_back(child); + } + + repr_clear_vector(); + + /* And insert new children from list */ + for (auto i=l.rbegin();i!=l.rend();++i) { + Inkscape::XML::Node *child = *i; + repr->addChild(child, nullptr); + Inkscape::GC::release(child); + } +} + + +void SPGradient::gradientRefModified(SPObject */*href*/, guint /*flags*/, SPGradient *gradient) +{ + if ( gradient->invalidateVector() ) { + gradient->requestModified(SP_OBJECT_MODIFIED_FLAG); + // Conditional to avoid causing infinite loop if there's a cycle in the href chain. + } +} + +/** Return true if change made. */ +bool SPGradient::invalidateVector() +{ + bool ret = false; + + if (vector.built) { + vector.built = false; + vector.stops.clear(); + ret = true; + } + + return ret; +} + +/** Return true if change made. */ +bool SPGradient::invalidateArray() +{ + bool ret = false; + + if (array.built) { + array.built = false; + // array.clear(); + ret = true; + } + + return ret; +} + +/** Creates normalized color vector */ +void SPGradient::rebuildVector() +{ + gint len = 0; + for (auto& child: children) { + if (SP_IS_STOP(&child)) { + len ++; + } + } + + has_stops = (len != 0); + + vector.stops.clear(); + + SPGradient *reffed = ref ? ref->getObject() : nullptr; + if ( !hasStops() && reffed ) { + /* Copy vector from referenced gradient */ + vector.built = true; // Prevent infinite recursion. + reffed->ensureVector(); + if (!reffed->vector.stops.empty()) { + vector.built = reffed->vector.built; + vector.stops.assign(reffed->vector.stops.begin(), reffed->vector.stops.end()); + return; + } + } + + for (auto& child: children) { + if (SP_IS_STOP(&child)) { + SPStop *stop = SP_STOP(&child); + + SPGradientStop gstop; + if (!vector.stops.empty()) { + // "Each gradient offset value is required to be equal to or greater than the + // previous gradient stop's offset value. If a given gradient stop's offset + // value is not equal to or greater than all previous offset values, then the + // offset value is adjusted to be equal to the largest of all previous offset + // values." + gstop.offset = MAX(stop->offset, vector.stops.back().offset); + } else { + gstop.offset = stop->offset; + } + + // "Gradient offset values less than 0 (or less than 0%) are rounded up to + // 0%. Gradient offset values greater than 1 (or greater than 100%) are rounded + // down to 100%." + gstop.offset = CLAMP(gstop.offset, 0, 1); + + gstop.color = stop->getColor(); + gstop.opacity = stop->getOpacity(); + + vector.stops.push_back(gstop); + } + } + + // Normalize per section 13.2.4 of SVG 1.1. + if (vector.stops.empty()) { + /* "If no stops are defined, then painting shall occur as if 'none' were specified as the + * paint style." + */ + { + SPGradientStop gstop; + gstop.offset = 0.0; + gstop.color.set( 0x00000000 ); + gstop.opacity = 0.0; + vector.stops.push_back(gstop); + } + { + SPGradientStop gstop; + gstop.offset = 1.0; + gstop.color.set( 0x00000000 ); + gstop.opacity = 0.0; + vector.stops.push_back(gstop); + } + } else { + /* "If one stop is defined, then paint with the solid color fill using the color defined + * for that gradient stop." + */ + if (vector.stops.front().offset > 0.0) { + // If the first one is not at 0, then insert a copy of the first at 0. + SPGradientStop gstop; + gstop.offset = 0.0; + gstop.color = vector.stops.front().color; + gstop.opacity = vector.stops.front().opacity; + vector.stops.insert(vector.stops.begin(), gstop); + } + if (vector.stops.back().offset < 1.0) { + // If the last one is not at 1, then insert a copy of the last at 1. + SPGradientStop gstop; + gstop.offset = 1.0; + gstop.color = vector.stops.back().color; + gstop.opacity = vector.stops.back().opacity; + vector.stops.push_back(gstop); + } + } + + vector.built = true; +} + +/** Creates normalized color mesh patch array */ +void SPGradient::rebuildArray() +{ + // std::cout << "SPGradient::rebuildArray()" << std::endl; + + if( !SP_IS_MESHGRADIENT(this) ) { + g_warning( "SPGradient::rebuildArray() called for non-mesh gradient" ); + return; + } + + array.read( SP_MESHGRADIENT( this ) ); + has_patches = array.patch_columns() > 0; +} + +Geom::Affine +SPGradient::get_g2d_matrix(Geom::Affine const &ctm, Geom::Rect const &bbox) const +{ + if (getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) { + return ( Geom::Scale(bbox.dimensions()) + * Geom::Translate(bbox.min()) + * Geom::Affine(ctm) ); + } else { + return ctm; + } +} + +Geom::Affine +SPGradient::get_gs2d_matrix(Geom::Affine const &ctm, Geom::Rect const &bbox) const +{ + if (getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) { + return ( gradientTransform + * Geom::Scale(bbox.dimensions()) + * Geom::Translate(bbox.min()) + * Geom::Affine(ctm) ); + } else { + return gradientTransform * ctm; + } +} + +void +SPGradient::set_gs2d_matrix(Geom::Affine const &ctm, + Geom::Rect const &bbox, Geom::Affine const &gs2d) +{ + gradientTransform = gs2d * ctm.inverse(); + if (getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX ) { + gradientTransform = ( gradientTransform + * Geom::Translate(-bbox.min()) + * Geom::Scale(bbox.dimensions()).inverse() ); + } + gradientTransform_set = TRUE; + + requestModified(SP_OBJECT_MODIFIED_FLAG); +} + + + + +/* CAIRO RENDERING STUFF */ + +void +sp_gradient_pattern_common_setup(cairo_pattern_t *cp, + SPGradient *gr, + Geom::OptRect const &bbox, + double opacity) +{ + // set spread type + switch (gr->getSpread()) { + case SP_GRADIENT_SPREAD_REFLECT: + cairo_pattern_set_extend(cp, CAIRO_EXTEND_REFLECT); + break; + case SP_GRADIENT_SPREAD_REPEAT: + cairo_pattern_set_extend(cp, CAIRO_EXTEND_REPEAT); + break; + case SP_GRADIENT_SPREAD_PAD: + default: + cairo_pattern_set_extend(cp, CAIRO_EXTEND_PAD); + break; + } + + // add stops + if (!SP_IS_MESHGRADIENT(gr)) { + for (auto & stop : gr->vector.stops) + { + // multiply stop opacity by paint opacity + cairo_pattern_add_color_stop_rgba(cp, stop.offset, + stop.color.v.c[0], stop.color.v.c[1], stop.color.v.c[2], stop.opacity * opacity); + } + } + + // set pattern transform matrix + Geom::Affine gs2user = gr->gradientTransform; + if (gr->getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX && bbox) { + Geom::Affine bbox2user(bbox->width(), 0, 0, bbox->height(), bbox->left(), bbox->top()); + gs2user *= bbox2user; + } + ink_cairo_pattern_set_matrix(cp, gs2user.inverse()); +} + +cairo_pattern_t * +SPGradient::create_preview_pattern(double width) +{ + cairo_pattern_t *pat = nullptr; + + if (!SP_IS_MESHGRADIENT(this)) { + ensureVector(); + + pat = cairo_pattern_create_linear(0, 0, width, 0); + + for (auto & stop : vector.stops) + { + cairo_pattern_add_color_stop_rgba(pat, stop.offset, + stop.color.v.c[0], stop.color.v.c[1], stop.color.v.c[2], stop.opacity); + } + } else { + + // For the moment, use the top row of nodes for preview. + unsigned columns = array.patch_columns(); + + double offset = 1.0/double(columns); + + pat = cairo_pattern_create_linear(0, 0, width, 0); + + for (unsigned i = 0; i < columns+1; ++i) { + SPMeshNode* node = array.node( 0, i*3 ); + cairo_pattern_add_color_stop_rgba(pat, i*offset, + node->color.v.c[0], node->color.v.c[1], node->color.v.c[2], node->opacity); + } + } + + return pat; +} + +bool SPGradient::isSolid() const +{ + if (swatch && hasStops() && getStopCount() == 1) { + return true; + } + return false; +} + +/* + 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:fileencoding=utf-8:textwidth=99 : |