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#include "config.h"
#ifdef ENABLE_SVG_FONTS
/*
* SVGFonts rendering implementation
*
* Authors:
* Felipe C. da S. Sanches <juca@members.fsf.org>
*
* Copyright (C) 2008 Felipe C. da S. Sanches
*
* Released under GNU GPL version 2 or later.
* Read the file 'COPYING' for more information.
*/
#include <2geom/pathvector.h>
#include <2geom/transforms.h>
#include "../style.h"
#include <cairo.h>
#include <vector>
#include "svg/svg.h"
#include "inkscape-cairo.h"
#include "nr-svgfonts.h"
//*************************//
// UserFont Implementation //
//*************************//
// I wrote this binding code because Cairomm does not yet support userfonts. I have moved this code to cairomm and sent them a patch.
// Once Cairomm incorporate the UserFonts binding, this code should be removed from inkscape and Cairomm API should be used.
static cairo_user_data_key_t key;
static cairo_status_t font_init_cb (cairo_scaled_font_t *scaled_font,
cairo_t */*cairo*/, cairo_font_extents_t *metrics){
cairo_font_face_t* face;
face = cairo_scaled_font_get_font_face(scaled_font);
SvgFont* instance = (SvgFont*) cairo_font_face_get_user_data(face, &key);
return instance->scaled_font_init(scaled_font, metrics);
}
static cairo_status_t font_text_to_glyphs_cb ( cairo_scaled_font_t *scaled_font,
const char *utf8,
int utf8_len,
cairo_glyph_t **glyphs,
int *num_glyphs,
cairo_text_cluster_t **clusters,
int *num_clusters,
cairo_text_cluster_flags_t *flags){
cairo_font_face_t* face;
face = cairo_scaled_font_get_font_face(scaled_font);
SvgFont* instance = (SvgFont*) cairo_font_face_get_user_data(face, &key);
return instance->scaled_font_text_to_glyphs(scaled_font, utf8, utf8_len, glyphs, num_glyphs, clusters, num_clusters, flags);
}
static cairo_status_t font_render_glyph_cb (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *metrics){
cairo_font_face_t* face;
face = cairo_scaled_font_get_font_face(scaled_font);
SvgFont* instance = (SvgFont*) cairo_font_face_get_user_data(face, &key);
return instance->scaled_font_render_glyph(scaled_font, glyph, cr, metrics);
}
UserFont::UserFont(SvgFont* instance){
this->face = cairo_user_font_face_create ();
cairo_user_font_face_set_init_func (this->face, font_init_cb);
cairo_user_font_face_set_render_glyph_func (this->face, font_render_glyph_cb);
cairo_user_font_face_set_text_to_glyphs_func(this->face, font_text_to_glyphs_cb);
cairo_font_face_set_user_data (this->face, &key, (void*)instance, (cairo_destroy_func_t) NULL);
}
//******************************//
// SvgFont class Implementation //
//******************************//
SvgFont::SvgFont(SPFont* spfont){
this->font = spfont;
this->missingglyph = NULL;
this->userfont = NULL;
}
cairo_status_t
SvgFont::scaled_font_init (cairo_scaled_font_t */*scaled_font*/,
cairo_font_extents_t */*metrics*/)
{
//TODO
// metrics->ascent = .75;
// metrics->descent = .25;
return CAIRO_STATUS_SUCCESS;
}
unsigned int size_of_substring(const char* substring, gchar* str){
const gchar* original_substring = substring;
while((g_utf8_get_char(substring)==g_utf8_get_char(str)) && g_utf8_get_char(substring) != 0 && g_utf8_get_char(str) != 0){
substring = g_utf8_next_char(substring);
str = g_utf8_next_char(str);
}
if (g_utf8_get_char(substring)==0)
return substring - original_substring;
else
return 0;
}
//TODO: in these macros, verify what happens when using unicode strings.
#define Match_VKerning_Rule (((SPVkern*)node)->u1->contains(previous_unicode[0])\
|| ((SPVkern*)node)->g1->contains(previous_glyph_name)) &&\
(((SPVkern*)node)->u2->contains(this->glyphs[i]->unicode[0])\
|| ((SPVkern*)node)->g2->contains(this->glyphs[i]->glyph_name.c_str()))
#define Match_HKerning_Rule (((SPHkern*)node)->u1->contains(previous_unicode[0])\
|| ((SPHkern*)node)->g1->contains(previous_glyph_name)) &&\
(((SPHkern*)node)->u2->contains(this->glyphs[i]->unicode[0])\
|| ((SPHkern*)node)->g2->contains(this->glyphs[i]->glyph_name.c_str()))
cairo_status_t
SvgFont::scaled_font_text_to_glyphs (cairo_scaled_font_t */*scaled_font*/,
const char *utf8,
int /*utf8_len*/,
cairo_glyph_t **glyphs,
int *num_glyphs,
cairo_text_cluster_t **/*clusters*/,
int */*num_clusters*/,
cairo_text_cluster_flags_t */*flags*/)
{
//This function receives a text string to be rendered. It then defines what is the sequence of glyphs that
// is used to properly render this string. It also defines the respective coordinates of each glyph. Thus, it
// has to read the attributes of the SVGFont hkern and vkern nodes in order to adjust the glyph kerning.
//It also determines the usage of the missing-glyph in portions of the string that does not match any of the declared glyphs.
unsigned long i;
int count = 0;
gchar* _utf8 = (gchar*) utf8;
unsigned int len;
bool missing;
//First we findout whats the number of glyphs needed.
while(g_utf8_get_char(_utf8)){
missing = true;
for (i=0; i < (unsigned long) this->glyphs.size(); i++){
if ( (len = size_of_substring(this->glyphs[i]->unicode.c_str(), _utf8)) ){
//TODO: store this cluster
_utf8+=len;
count++;
missing=false;
break;
}
}
if (missing){
//TODO: store this cluster
_utf8++;
count++;
}
}
//We use that info to allocate memory for the glyphs
*glyphs = (cairo_glyph_t*) malloc(count*sizeof(cairo_glyph_t));
char* previous_unicode = NULL; //This is used for kerning
gchar* previous_glyph_name = NULL; //This is used for kerning
count=0;
double x=0, y=0;//These vars store the position of the glyph within the rendered string
bool is_horizontal_text = true; //TODO
_utf8 = (char*) utf8;
while(g_utf8_get_char(_utf8)){
len = 0;
for (i=0; i < (unsigned long) this->glyphs.size(); i++){
//check whether is there a glyph declared on the SVG document
// that matches with the text string in its current position
if ( (len = size_of_substring(this->glyphs[i]->unicode.c_str(), _utf8)) ){
for(SPObject* node = this->font->children;previous_unicode && node;node=node->next){
//apply glyph kerning if appropriate
if (SP_IS_HKERN(node) && is_horizontal_text && Match_HKerning_Rule ){
x -= (((SPHkern*)node)->k / 1000.0);//TODO: use here the height of the font
}
if (SP_IS_VKERN(node) && !is_horizontal_text && Match_VKerning_Rule ){
y -= (((SPVkern*)node)->k / 1000.0);//TODO: use here the "height" of the font
}
}
previous_unicode = (char*) this->glyphs[i]->unicode.c_str();//used for kerning checking
previous_glyph_name = (char*) this->glyphs[i]->glyph_name.c_str();//used for kerning checking
(*glyphs)[count].index = i;
(*glyphs)[count].x = x;
(*glyphs)[count++].y = y;
//advance glyph coordinates:
if (is_horizontal_text) x+=(this->font->horiz_adv_x/1000.0);//TODO: use here the height of the font
else y+=(this->font->vert_adv_y/1000.0);//TODO: use here the "height" of the font
_utf8+=len; //advance 'len' bytes in our string pointer
//continue;
goto raptorz;
}
}
raptorz:
if (len==0){
(*glyphs)[count].index = i;
(*glyphs)[count].x = x;
(*glyphs)[count++].y = y;
//advance glyph coordinates:
if (is_horizontal_text) x+=(this->font->horiz_adv_x/1000.0);//TODO: use here the height of the font
else y+=(this->font->vert_adv_y/1000.0);//TODO: use here the "height" of the font
_utf8 = g_utf8_next_char(_utf8); //advance 1 char in our string pointer
}
}
*num_glyphs = count;
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t
SvgFont::scaled_font_render_glyph (cairo_scaled_font_t */*scaled_font*/,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t */*metrics*/)
{
// This method does the actual rendering of glyphs.
// We have glyphs.size() glyphs and possibly one missing-glyph declared on this SVG document
// The id of the missing-glyph is always equal to glyphs.size()
// All the other glyphs have ids ranging from 0 to glyphs.size()-1
if (glyph > this->glyphs.size()) return CAIRO_STATUS_SUCCESS;//TODO: this is an error!
SPObject* node;
if (glyph == this->glyphs.size()){
if (!this->missingglyph) return CAIRO_STATUS_SUCCESS;
node = (SPObject*) this->missingglyph;
} else {
node = (SPObject*) this->glyphs[glyph];
}
//glyphs can be described by arbitrary SVG declared in the childnodes of a glyph node
// or using the d attribute of a glyph node.
// pathv stores the path description from the d attribute:
Geom::PathVector pathv;
if (SP_IS_GLYPH(node) && ((SPGlyph*)node)->d) {
pathv = sp_svg_read_pathv(((SPGlyph*)node)->d);
} else if (SP_IS_MISSING_GLYPH(node) && ((SPMissingGlyph*)node)->d) {
pathv = sp_svg_read_pathv(((SPMissingGlyph*)node)->d);
} else {
return CAIRO_STATUS_SUCCESS; // FIXME: is this the right code to return?
}
if (!pathv.empty()){
//This glyph has a path description on its d attribute, so we render it:
cairo_new_path(cr);
//adjust scale of the glyph
// Geom::Scale s(1.0/((SPFont*) node->parent)->horiz_adv_x);
Geom::Scale s(1.0/1000);//TODO: use here the units-per-em attribute?
//This matrix flips the glyph vertically
Geom::Matrix m(Geom::Coord(1),Geom::Coord(0),Geom::Coord(0),Geom::Coord(-1),Geom::Coord(0),Geom::Coord(0));
//then we offset it
// pathv += Geom::Point(Geom::Coord(0),Geom::Coord(-((SPFont*) node->parent)->horiz_adv_x));
pathv += Geom::Point(Geom::Coord(0),Geom::Coord(-1000));//TODO: use here the units-per-em attribute?
Geom::Rect area( Geom::Point(0,0), Geom::Point(1,1) ); //I need help here! (reaction: note that the 'area' parameter is an *optional* rect, so you can pass an empty Geom::OptRect() )
feed_pathvector_to_cairo (cr, pathv, s*m, area, false, 0);
cairo_fill(cr);
}
//TODO: render the SVG described on this glyph's child nodes.
return CAIRO_STATUS_SUCCESS;
}
cairo_font_face_t*
SvgFont::get_font_face(){
if (!this->userfont) {
for(SPObject* node = this->font->children;node;node=node->next){
if (SP_IS_GLYPH(node)){
this->glyphs.push_back((SPGlyph*)node);
}
if (SP_IS_MISSING_GLYPH(node)){
this->missingglyph=(SPMissingGlyph*)node;
}
}
this->userfont = new UserFont(this);
}
return this->userfont->face;
}
void SvgFont::refresh(){
this->glyphs.clear();
delete this->userfont;
this->userfont = NULL;
}
#endif //#ifdef ENABLE_SVG_FONTS
/*
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 :
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