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index 28d29b59c6aebe8079c29a54506908720321d2a4..7a0db664ac322e6ac13ffd79de07760c2ad6f3a3 100644 (file)
* SVGFonts rendering implementation
*
* Authors:
- * Felipe C. da S. Sanches <felipe.sanches@gmail.com>
+ * Felipe C. da S. Sanches <juca@members.fsf.org>
*
* Copyright (C) 2008 Felipe C. da S. Sanches
*
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);
+ 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_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);
+ 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);
+ 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);
+ 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;
+ 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)
+SvgFont::scaled_font_init (cairo_scaled_font_t */*scaled_font*/,
+ cairo_font_extents_t */*metrics*/)
{
//TODO
// metrics->ascent = .75;
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;
+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)
+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.
+ //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;
- char* _utf8 = (char*) utf8;
+ gchar* _utf8 = (gchar*) utf8;
unsigned int len;
- //First we findout whats the worst case number of glyphs.
- while(_utf8[0] != '\0'){
- _utf8++;
- count++;
+ 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));
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(_utf8[0] != '\0'){
- len = 0;
+
+ while(g_utf8_get_char(_utf8)){
+ len = 0;
for (i=0; i < (unsigned long) this->glyphs.size(); i++){
- if ( (len = compare_them(this->glyphs[i]->unicode, _utf8)) ){
- //check whether is there a glyph declared on the SVG document
- // that matches with the text string in its current position
- 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){
- if ( (((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))
- )//TODO: verify what happens when using unicode strings.
- x -= (((SPHkern*)node)->k / this->font->horiz_adv_x);
- }
- if (SP_IS_VKERN(node) && !is_horizontal_text){
- if ( (((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))
- )//TODO: idem
- y -= (((SPVkern*)node)->k / this->font->vert_adv_y);
- }
- }
- previous_unicode = this->glyphs[i]->unicode;//used for kerning checking
- previous_glyph_name = this->glyphs[i]->glyph_name;//used for kerning checking
+ //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++;
- else y++;
- _utf8+=len; //advance 'len' chars in our string pointer
- //continue;
- goto dirty;
+
+ //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;
}
}
-dirty:
- if (!len){
- (*glyphs)[count].index = i;
- (*glyphs)[count].x = x;
- (*glyphs)[count++].y = y;
- //advance glyph coordinates:
- if (is_horizontal_text) x++;
- else y++;
- _utf8++; //advance 1 char in our string pointer
- }
+ 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)
+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
+ // 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()){
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);
}
//glyphs can be described by arbitrary SVG declared in the childnodes of a glyph node
if (!pathv.empty()){
//This glyph has a path description on its d attribute, so we render it:
cairo_new_path(cr);
- Geom::Scale s(1.0/((SPFont*) node->parent)->horiz_adv_x);
- 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 boost::optional<Geom::Rect>() )
- feed_pathvector_to_cairo (cr, pathv, s, area, false, 0);
+ //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);
}
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);
+ 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 :