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#include "config.h"
#ifdef ENABLE_SVG_FONTS
/*
* SVGFonts rendering implementation
*
* Authors:
* Felipe C. da S. Sanches <felipe.sanches@gmail.com>
*
* Copyright (C) 2008 Felipe C. da S. Sanches
*
* Released under GNU GPL version 2 or later.
* Read the file 'COPYING' for more information.
*/
#include <libnr/n-art-bpath.h>
#include "../style.h"
#include <cairo.h>
#include <vector>
#include "svg/svg.h"
#include "inkscape-cairo.h"
#include "nr-svgfonts.h"
//***********************************//
// SvgFontDrawingArea Implementation //
//***********************************//
class SvgFontDrawingArea : Gtk::DrawingArea{
public:
SvgFontDrawingArea(SvgFont* svgfont){
this->svgfont = svgfont;
}
private:
SvgFont* svgfont;
bool on_expose_event (GdkEventExpose *event){
Glib::RefPtr<Gdk::Window> window = get_window();
Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
cr->set_font_face( Cairo::RefPtr<Cairo::FontFace>(new Cairo::FontFace(this->svgfont->get_font_face(), false /* does not have reference */)) );
cr->set_font_size (200);
cr->move_to (200, 200);
cr->show_text ("A@!A");
cr->move_to (200, 400);
cr->show_text ("A!@A");
return TRUE;
}
};//class SvgFontDrawingArea
//*************************//
// UserFont Implementation //
//*************************//
static cairo_user_data_key_t key;
static cairo_status_t font_init_cb (cairo_scaled_font_t *scaled_font,
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,
cairo_glyph_t **glyphs,
int *num_glyphs){
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, glyphs, num_glyphs);
}
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;
Gtk::Window* window;
SvgFontDrawingArea* font_da;
window = new Gtk::Window();
window->set_default_size (1200, 850);
font_da = new SvgFontDrawingArea(this);
window->add((Gtk::Widget&) *font_da);
window->show_all();
}
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 compare_them(char* s1, char* s2){
unsigned int p=0;
while((s1[p] == s2[p]) && s1[p] != '\0' && s2[p] != '\0') p++;
if (s1[p]=='\0') return p;
else return 0;
}
cairo_status_t
SvgFont::scaled_font_text_to_glyphs (cairo_scaled_font_t *scaled_font,
const char *utf8,
cairo_glyph_t **glyphs,
int *num_glyphs)
{
unsigned long i;
int count = 0;
char* _utf8 = (char*) utf8;
unsigned int len;
while(_utf8[0] != '\0'){
_utf8++;
count++;
}
*glyphs = (cairo_glyph_t*) malloc(count*sizeof(cairo_glyph_t));
count=0;
_utf8 = (char*) utf8;
while(_utf8[0] != '\0'){
len = 0;
for (i=0; i < (unsigned long) this->glyphs.size(); i++){
if ( len = compare_them(this->glyphs[i]->unicode, _utf8) ){
(*glyphs)[count].index = i;
(*glyphs)[count].x = count; //TODO
(*glyphs)[count++].y = 0; //TODO
_utf8+=len;
continue;
}
}
if (!len){
(*glyphs)[count].index = i;
(*glyphs)[count].x = count; //TODO
(*glyphs)[count++].y = 0; //TODO
_utf8++;
}
}
*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)
{
if (glyph > this->glyphs.size()) return CAIRO_STATUS_SUCCESS;
SPObject* node;
if (glyph == this->glyphs.size()){
if (!this->missingglyph) return CAIRO_STATUS_SUCCESS;
node = (SPObject*) this->missingglyph;
g_warning("RENDER MISSING-GLYPH");
} else {
node = (SPObject*) this->glyphs[glyph];
g_warning("RENDER %s", this->glyphs[glyph]->unicode);
}
NArtBpath *bpath = NULL;
if (SP_IS_GLYPH(node) && ((SPGlyph*)node)->d) bpath = sp_svg_read_path(((SPGlyph*)node)->d);
if (SP_IS_MISSING_GLYPH(node) && ((SPMissingGlyph*)node)->d) bpath = sp_svg_read_path(((SPMissingGlyph*)node)->d);
if (!bpath) return CAIRO_STATUS_SUCCESS;
cairo_new_path(cr);
NR::scale s(1.0/((SPFont*) node->parent)->horiz_adv_x);
NR::Matrix t(s);
NRRect area(0,0,1,1); //I need help here!
feed_curve_to_cairo (cr, bpath, t, area.upgrade(), false, 0);
cairo_fill(cr);
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)){
g_warning("glyphs.push_back((SPGlyph*)node); (node->unicode='%s')", ((SPGlyph*)node)->unicode);
this->glyphs.push_back((SPGlyph*)node);
}
if (SP_IS_MISSING_GLYPH(node)){
g_warning("missingglyph=(SPMissingGlyph*)node;");
this->missingglyph=(SPMissingGlyph*)node;
}
}
this->userfont = new UserFont(this);
}
return this->userfont->face;
}
#endif //#ifdef ENABLE_SVG_FONTS
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