#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <cstring>

#include <string>

#include <2geom/transforms.h>

#include "macros.h"

#include "svg/svg.h"

#include "display/cairo-utils.h"

#include "display/drawing-context.h"

#include "display/drawing-surface.h"

#include "display/drawing.h"

#include "display/drawing-group.h"

#include "attributes.h"

#include "document-private.h"

#include "uri.h"

#include "style.h"

#include "sp-pattern.h"

#include "xml/repr.h"

#include "display/grayscale.h"

#include <sigc++/functors/ptr_fun.h>

#include <sigc++/adaptors/bind.h>

static void sp_pattern_class_init (SPPatternClass *klass);

static void sp_pattern_init (SPPattern *gr);

static void sp_pattern_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);

static void sp_pattern_release (SPObject *object);

static void sp_pattern_set (SPObject *object, unsigned int key, const gchar *value);

static void sp_pattern_update (SPObject *object, SPCtx *ctx, unsigned int flags);

static void sp_pattern_modified (SPObject *object, unsigned int flags);

static void pattern_ref_changed(SPObject *old_ref, SPObject *ref, SPPattern *pat);

static void pattern_ref_modified (SPObject *ref, guint flags, SPPattern *pattern);

static cairo_pattern_t *sp_pattern_create_pattern(SPPaintServer *ps, cairo_t *ct, Geom::OptRect const &bbox, double opacity);

static SPPaintServerClass * pattern_parent_class;

sp_pattern_get_type (void)

{

static GType pattern_type = 0;

if (!pattern_type) {

GTypeInfo pattern_info = {

sizeof (SPPatternClass),

NULL, /* base_init */

NULL, /* base_finalize */

(GClassInitFunc) sp_pattern_class_init,

NULL, /* class_finalize */

NULL, /* class_data */

sizeof (SPPattern),

16, /* n_preallocs */

(GInstanceInitFunc) sp_pattern_init,

NULL, /* value_table */

};

pattern_type = g_type_register_static (SP_TYPE_PAINT_SERVER, "SPPattern", &pattern_info, (GTypeFlags)0);

}

return pattern_type;

}

static void

sp_pattern_class_init (SPPatternClass *klass)

{

SPObjectClass *sp_object_class;

SPPaintServerClass *ps_class;

sp_object_class = (SPObjectClass *) klass;

ps_class = (SPPaintServerClass *) klass;

pattern_parent_class = (SPPaintServerClass*)g_type_class_ref (SP_TYPE_PAINT_SERVER);

sp_object_class->build = sp_pattern_build;

sp_object_class->release = sp_pattern_release;

sp_object_class->set = sp_pattern_set;

sp_object_class->update = sp_pattern_update;

sp_object_class->modified = sp_pattern_modified;

// do we need _write? seems to work without it

ps_class->pattern_new = sp_pattern_create_pattern;

}

static void

sp_pattern_init (SPPattern *pat)

{

pat->ref = new SPPatternReference(pat);

pat->ref->changedSignal().connect(sigc::bind(sigc::ptr_fun(pattern_ref_changed), pat));

pat->patternUnits = SP_PATTERN_UNITS_OBJECTBOUNDINGBOX;

pat->patternUnits_set = FALSE;

pat->patternContentUnits = SP_PATTERN_UNITS_USERSPACEONUSE;

pat->patternContentUnits_set = FALSE;

pat->patternTransform = Geom::identity();

pat->patternTransform_set = FALSE;

pat->x.unset();

pat->y.unset();

pat->width.unset();

pat->height.unset();

pat->viewBox_set = FALSE;

new (&pat->modified_connection) sigc::connection();

}

static void

sp_pattern_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)

{

if (((SPObjectClass *) pattern_parent_class)->build)

(* ((SPObjectClass *) pattern_parent_class)->build) (object, document, repr);

object->readAttr( "patternUnits" );

object->readAttr( "patternContentUnits" );

object->readAttr( "patternTransform" );

object->readAttr( "x" );

object->readAttr( "y" );

object->readAttr( "width" );

object->readAttr( "height" );

object->readAttr( "viewBox" );

object->readAttr( "xlink:href" );

/* Register ourselves */

document->addResource("pattern", object);

}

static void sp_pattern_release(SPObject *object)

{

SPPattern *pat = reinterpret_cast<SPPattern *>(object);

if (object->document) {

// Unregister ourselves

object->document->removeResource("pattern", object);

}

if (pat->ref) {

pat->modified_connection.disconnect();

pat->ref->detach();

delete pat->ref;

pat->ref = NULL;

}

pat->modified_connection.~connection();

if (((SPObjectClass *) pattern_parent_class)->release) {

((SPObjectClass *) pattern_parent_class)->release (object);

}

}

static void

sp_pattern_set (SPObject *object, unsigned int key, const gchar *value)

{

SPPattern *pat = SP_PATTERN (object);

switch (key) {

case SP_ATTR_PATTERNUNITS:

if (value) {

if (!strcmp (value, "userSpaceOnUse")) {

pat->patternUnits = SP_PATTERN_UNITS_USERSPACEONUSE;

} else {

pat->patternUnits = SP_PATTERN_UNITS_OBJECTBOUNDINGBOX;

}

pat->patternUnits_set = TRUE;

} else {

pat->patternUnits_set = FALSE;

}

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_PATTERNCONTENTUNITS:

if (value) {

if (!strcmp (value, "userSpaceOnUse")) {

pat->patternContentUnits = SP_PATTERN_UNITS_USERSPACEONUSE;

} else {

pat->patternContentUnits = SP_PATTERN_UNITS_OBJECTBOUNDINGBOX;

}

pat->patternContentUnits_set = TRUE;

} else {

pat->patternContentUnits_set = FALSE;

}

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_PATTERNTRANSFORM: {

Geom::Affine t;

if (value && sp_svg_transform_read (value, &t)) {

pat->patternTransform = t;

pat->patternTransform_set = TRUE;

} else {

pat->patternTransform = Geom::identity();

pat->patternTransform_set = FALSE;

}

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

}

case SP_ATTR_X:

pat->x.readOrUnset(value);

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_Y:

pat->y.readOrUnset(value);

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_WIDTH:

pat->width.readOrUnset(value);

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_HEIGHT:

pat->height.readOrUnset(value);

object->requestModified(SP_OBJECT_MODIFIED_FLAG);

break;

case SP_ATTR_VIEWBOX: {

/* fixme: Think (Lauris) */

double x, y, width, height;

char *eptr;

if (value) {

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)) {

pat->viewBox = Geom::Rect::from_xywh(x, y, width, height);

pat->viewBox_set = TRUE;

} else {

pat->viewBox_set = FALSE;

}

} else {

pat->viewBox_set = FALSE;

}

object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);

break;

}

case SP_ATTR_XLINK_HREF:

if ( value && pat->href && ( strcmp(value, pat->href) == 0 ) ) {

/* Href unchanged, do nothing. */

} else {

g_free(pat->href);

pat->href = NULL;

if (value) {

// First, set the href field; it's only used in the "unchanged" check above.

pat->href = g_strdup(value);

// Now do the attaching, which emits the changed signal.

if (value) {

try {

pat->ref->attach(Inkscape::URI(value));

} catch (Inkscape::BadURIException &e) {

g_warning("%s", e.what());

pat->ref->detach();

}

} else {

pat->ref->detach();

}

}

}

break;

default:

if (((SPObjectClass *) pattern_parent_class)->set)

((SPObjectClass *) pattern_parent_class)->set (object, key, value);

break;

}

}

static GSList *pattern_getchildren(SPPattern *pat)

{

GSList *l = NULL;

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->firstChild()) { // find the first one with children

for (SPObject *child = pat->firstChild() ; child ; child = child->getNext() ) {

l = g_slist_prepend (l, child);

}

break; // do not go further up the chain if children are found

}

}

return l;

}

static void

sp_pattern_update (SPObject *object, SPCtx *ctx, unsigned int flags)

{

SPPattern *pat = SP_PATTERN (object);

if (flags & SP_OBJECT_MODIFIED_FLAG) flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;

flags &= SP_OBJECT_MODIFIED_CASCADE;

GSList *l = pattern_getchildren (pat);

l = g_slist_reverse (l);

while (l) {

SPObject *child = SP_OBJECT (l->data);

sp_object_ref (child, NULL);

l = g_slist_remove (l, child);

if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {

child->updateDisplay(ctx, flags);

}

sp_object_unref (child, NULL);

}

}

static void

sp_pattern_modified (SPObject *object, guint flags)

{

SPPattern *pat = SP_PATTERN (object);

if (flags & SP_OBJECT_MODIFIED_FLAG) flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;

flags &= SP_OBJECT_MODIFIED_CASCADE;

GSList *l = pattern_getchildren (pat);

l = g_slist_reverse (l);

while (l) {

SPObject *child = SP_OBJECT (l->data);

sp_object_ref (child, NULL);

l = g_slist_remove (l, child);

if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {

child->emitModified(flags);

}

sp_object_unref (child, NULL);

}

}

static void

pattern_ref_changed(SPObject *old_ref, SPObject *ref, SPPattern *pat)

{

if (old_ref) {

pat->modified_connection.disconnect();

}

if (SP_IS_PATTERN (ref)) {

pat->modified_connection = ref->connectModified(sigc::bind<2>(sigc::ptr_fun(&pattern_ref_modified), pat));

}

pattern_ref_modified (ref, 0, pat);

}

static void pattern_ref_modified (SPObject */*ref*/, guint /*flags*/, SPPattern *pattern)

{

if ( SP_IS_OBJECT(pattern) ) {

pattern->requestModified(SP_OBJECT_MODIFIED_FLAG);

}

// Conditional to avoid causing infinite loop if there's a cycle in the href chain.

}

static guint

count_pattern_hrefs(SPObject *o, SPPattern *pat)

{

if (!o)

return 1;

guint i = 0;

SPStyle *style = o->style;

if (style

&& style->fill.isPaintserver()

&& SP_IS_PATTERN(SP_STYLE_FILL_SERVER(style))

&& SP_PATTERN(SP_STYLE_FILL_SERVER(style)) == pat)

{

i ++;

}

if (style

&& style->stroke.isPaintserver()

&& SP_IS_PATTERN(SP_STYLE_STROKE_SERVER(style))

&& SP_PATTERN(SP_STYLE_STROKE_SERVER(style)) == pat)

{

i ++;

}

for ( SPObject *child = o->firstChild(); child != NULL; child = child->next ) {

i += count_pattern_hrefs(child, pat);

}

return i;

}

SPPattern *pattern_chain(SPPattern *pattern)

{

SPDocument *document = pattern->document;

Inkscape::XML::Document *xml_doc = document->getReprDoc();

Inkscape::XML::Node *defsrepr = document->getDefs()->getRepr();

Inkscape::XML::Node *repr = xml_doc->createElement("svg:pattern");

repr->setAttribute("inkscape:collect", "always");

gchar *parent_ref = g_strconcat("#", pattern->getRepr()->attribute("id"), NULL);

repr->setAttribute("xlink:href", parent_ref);

g_free (parent_ref);

defsrepr->addChild(repr, NULL);

const gchar *child_id = repr->attribute("id");

SPObject *child = document->getObjectById(child_id);

g_assert (SP_IS_PATTERN (child));

return SP_PATTERN (child);

}

SPPattern *

sp_pattern_clone_if_necessary (SPItem *item, SPPattern *pattern, const gchar *property)

{

if (!pattern->href || pattern->hrefcount > count_pattern_hrefs(item, pattern)) {

pattern = pattern_chain (pattern);

gchar *href = g_strconcat("url(#", pattern->getRepr()->attribute("id"), ")", NULL);

SPCSSAttr *css = sp_repr_css_attr_new ();

sp_repr_css_set_property (css, property, href);

sp_repr_css_change_recursive(item->getRepr(), css, "style");

}

return pattern;

}

sp_pattern_transform_multiply (SPPattern *pattern, Geom::Affine postmul, bool set)

{

// this formula is for a different interpretation of pattern transforms as described in (*) in sp-pattern.cpp

// for it to work, we also need sp_object_read_attr( item, "transform");

//pattern->patternTransform = premul * item->transform * pattern->patternTransform * item->transform.inverse() * postmul;

// otherwise the formula is much simpler

if (set) {

pattern->patternTransform = postmul;

} else {

pattern->patternTransform = pattern_patternTransform(pattern) * postmul;

}

pattern->patternTransform_set = TRUE;

gchar *c=sp_svg_transform_write(pattern->patternTransform);

pattern->getRepr()->setAttribute("patternTransform", c);

g_free(c);

}

const gchar *pattern_tile(GSList *reprs, Geom::Rect bounds, SPDocument *document, Geom::Affine transform, Geom::Affine move)

{

Inkscape::XML::Document *xml_doc = document->getReprDoc();

Inkscape::XML::Node *defsrepr = document->getDefs()->getRepr();

Inkscape::XML::Node *repr = xml_doc->createElement("svg:pattern");

repr->setAttribute("patternUnits", "userSpaceOnUse");

sp_repr_set_svg_double(repr, "width", bounds.dimensions()[Geom::X]);

sp_repr_set_svg_double(repr, "height", bounds.dimensions()[Geom::Y]);

gchar *t=sp_svg_transform_write(transform);

repr->setAttribute("patternTransform", t);

g_free(t);

defsrepr->appendChild(repr);

const gchar *pat_id = repr->attribute("id");

SPObject *pat_object = document->getObjectById(pat_id);

for (GSList *i = reprs; i != NULL; i = i->next) {

Inkscape::XML::Node *node = (Inkscape::XML::Node *)(i->data);

SPItem *copy = SP_ITEM(pat_object->appendChildRepr(node));

Geom::Affine dup_transform;

if (!sp_svg_transform_read (node->attribute("transform"), &dup_transform))

dup_transform = Geom::identity();

dup_transform *= move;

copy->doWriteTransform(copy->getRepr(), dup_transform, NULL, false);

}

Inkscape::GC::release(repr);

return pat_id;

}

SPPattern *pattern_getroot(SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if ( pat_i->firstChild() ) { // find the first one with children

return pat_i;

}

}

return pat; // document is broken, we can't get to root; but at least we can return pat which is supposedly a valid pattern

}

guint pattern_patternUnits (SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->patternUnits_set)

return pat_i->patternUnits;

}

return pat->patternUnits;

}

guint pattern_patternContentUnits (SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->patternContentUnits_set)

return pat_i->patternContentUnits;

}

return pat->patternContentUnits;

}

Geom::Affine const &pattern_patternTransform(SPPattern const *pat)

{

for (SPPattern const *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->patternTransform_set)

return pat_i->patternTransform;

}

return pat->patternTransform;

}

gdouble pattern_x (SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->x._set)

return pat_i->x.computed;

}

return 0;

}

gdouble pattern_y (SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->y._set)

return pat_i->y.computed;

}

return 0;

}

gdouble pattern_width (SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->width._set)

return pat_i->width.computed;

}

return 0;

}

gdouble pattern_height (SPPattern *pat)

{

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->height._set)

return pat_i->height.computed;

}

return 0;

}

Geom::OptRect pattern_viewBox (SPPattern *pat)

{

Geom::OptRect viewbox;

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

if (pat_i->viewBox_set) {

viewbox = pat_i->viewBox;

break;

}

}

return viewbox;

}

static bool pattern_hasItemChildren (SPPattern *pat)

{

bool hasChildren = false;

for (SPObject *child = pat->firstChild() ; child && !hasChildren ; child = child->getNext() ) {

if (SP_IS_ITEM(child)) {

hasChildren = true;

}

}

return hasChildren;

}

static cairo_pattern_t *

sp_pattern_create_pattern(SPPaintServer *ps,

cairo_t *base_ct,

Geom::OptRect const &bbox,

double opacity)

{

SPPattern *pat = SP_PATTERN (ps);

bool needs_opacity = (1.0 - opacity) >= 1e-3;

bool visible = opacity >= 1e-3;

if (!visible)

return NULL;

/* Show items */

SPPattern *shown = NULL;

for (SPPattern *pat_i = pat; pat_i != NULL; pat_i = pat_i->ref ? pat_i->ref->getObject() : NULL) {

// find the first one with item children

if (pat_i && SP_IS_OBJECT (pat_i) && pattern_hasItemChildren(pat_i)) {

shown = pat_i;

break; // do not go further up the chain if children are found

}

}

if (!shown) {

return cairo_pattern_create_rgba(0,0,0,0);

}

/* Create drawing for rendering */

Inkscape::Drawing drawing;

unsigned int dkey = SPItem::display_key_new (1);

Inkscape::DrawingGroup *root = new Inkscape::DrawingGroup(drawing);

drawing.setRoot(root);

for (SPObject *child = shown->firstChild(); child != NULL; child = child->getNext() ) {

if (SP_IS_ITEM (child)) {

// for each item in pattern, show it on our drawing, add to the group,

// and connect to the release signal in case the item gets deleted

Inkscape::DrawingItem *cai;

cai = SP_ITEM(child)->invoke_show (drawing, dkey, SP_ITEM_SHOW_DISPLAY);

root->appendChild(cai);

}

}

// viewBox to pattern server

Geom::Affine vb2ps = Geom::identity();

if (pat->viewBox_set) {

Geom::Rect vb = *pattern_viewBox(pat);

gdouble tmp_x = pattern_width (pat) / vb.width();

gdouble tmp_y = pattern_height (pat) / vb.height();

// FIXME: preserveAspectRatio must be taken into account here too!

vb2ps = Geom::Affine(tmp_x, 0.0, 0.0, tmp_y, pattern_x(pat) - vb.left() * tmp_x, pattern_y(pat) - vb.top() * tmp_y);

}

// We must determine the size and scaling of the pattern at the time it is displayed and render

// the pattern onto a surface with that size and at that resolution.

// Pattern server to user

Geom::Affine ps2user;

ps2user = pattern_patternTransform(pat);

if (!pat->viewBox_set && pattern_patternContentUnits (pat) == SP_PATTERN_UNITS_OBJECTBOUNDINGBOX) {

/* BBox to user coordinate system */

Geom::Affine bbox2user (bbox->width(), 0.0, 0.0, bbox->height(), bbox->left(), bbox->top());

ps2user *= bbox2user;

}

ps2user = Geom::Translate (pattern_x (pat), pattern_y (pat)) * ps2user;

// Pattern size in pattern space

Geom::Rect pattern_tile = Geom::Rect::from_xywh(pattern_x(pat), pattern_y(pat),

pattern_width(pat), pattern_height(pat));

if (pattern_patternUnits(pat) == SP_PATTERN_UNITS_OBJECTBOUNDINGBOX) {

// interpret x, y, width, height in relation to bbox

Geom::Affine bbox2user(bbox->width(), 0.0, 0.0, bbox->height(), bbox->left(), bbox->top());

pattern_tile = pattern_tile * bbox2user;

}

// Transform of object with pattern (includes screen scaling)

cairo_matrix_t cm;

cairo_get_matrix(base_ct, &cm);

Geom::Affine full(cm.xx, cm.yx, cm.xy, cm.yy, 0, 0);

// The DrawingSurface class is suppose to handle the mapping from "logical space"

// (coordinates in the rendering) to "physical space" (surface pixels).

// An oversampling is done as the pattern may not pixel align with the final surface.

// The cairo surface is created when the DrawingContext is declared.

// oversample the pattern slightly

// TODO: find optimum value

// TODO: this is lame. instead of using descrim(), we should extract

// the scaling component from the complete matrix and use it

// to find the optimum tile size for rendering

// c is number of pixels in buffer x and y.

Geom::Point c(pattern_tile.dimensions()*vb2ps.descrim()*ps2user.descrim()*full.descrim()*1.1);

c[Geom::X] = ceil(c[Geom::X]);

c[Geom::Y] = ceil(c[Geom::Y]);

// Create drawing surface with size of pattern tile (in tile space) but with number of pixels

// based on required resolution (c).

Inkscape::DrawingSurface pattern_surface(pattern_tile, c.ceil());

Inkscape::DrawingContext ct(pattern_surface);

pattern_tile *= pattern_surface.drawingTransform();

Geom::IntRect one_tile = pattern_tile.roundOutwards();

// render pattern.

if (needs_opacity) {

ct.pushGroup(); // this group is for pattern + opacity

}

// TODO: make sure there are no leaks.

Inkscape::UpdateContext ctx; // UpdateContext is structure with only ctm!

ctx.ctm = vb2ps * pattern_surface.drawingTransform();

ct.transform( pattern_surface.drawingTransform().inverse() );

drawing.update(Geom::IntRect::infinite(), ctx);

// Render drawing to pattern_surface via drawing context, this calls root->render

// which is really DrawingItem->render().

drawing.render(ct, one_tile);

for (SPObject *child = shown->firstChild() ; child != NULL; child = child->getNext() ) {

if (SP_IS_ITEM (child)) {

SP_ITEM(child)->invoke_hide(dkey);

}

}

// Uncomment to debug

// cairo_surface_t* raw = pattern_surface.raw();

// std::cout << " cairo_surface (sp-pattern): "

// << " width: " << cairo_image_surface_get_width( raw )

// << " height: " << cairo_image_surface_get_height( raw )

// << std::endl;

// cairo_surface_write_to_png( pattern_surface.raw(), "sp-pattern.png" );

if (needs_opacity) {

ct.popGroupToSource(); // pop raw pattern

ct.paint(opacity); // apply opacity

}

cairo_pattern_t *cp = cairo_pattern_create_for_surface(pattern_surface.raw());

// Apply transformation to user space. Also compensate for oversampling.

ink_cairo_pattern_set_matrix(cp, ps2user.inverse() * pattern_surface.drawingTransform());

cairo_pattern_set_extend(cp, CAIRO_EXTEND_REPEAT);

return cp;

}