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32346b6123
The same underlying mechanism is used for both simple text strings and passages, but without the intervening hierarchy of paragraphs etc. Results in only the one view for a simple text string.
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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text.h
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Text management
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Copyright (C) 2022 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2022/9/4
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef __QF_ui_text_h
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#define __QF_ui_text_h
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#include <hb.h>
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#include <hb-ft.h>
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#include "QF/darray.h"
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#include "QF/ecs.h"
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// These can be converted to hb_direction_t simply by oring with 4
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typedef enum {
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text_right_down, // left to right, then down horizontal text
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text_left_down, // right to left, then down horizontal text
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text_down_right, // top to bottom, then right vertical text
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text_up_right, // bottom to top, then right vertical text
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text_right_up, // left to right, then up horizontal text
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text_left_up, // right to left, then up horizontal text
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text_down_left, // top to bottom, then left vertical text
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text_up_left, // bottom to top, then left vertical text
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} text_dir_e;
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typedef struct script_component_s {
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hb_language_t language;
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hb_script_t script;
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text_dir_e direction;
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} script_component_t;
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typedef struct glyphobj_s {
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int glyphid;
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int x, y;
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int fontid;
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} glyphobj_t;
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typedef struct glyphref_s {
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uint32_t start;
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uint32_t count;
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} glyphref_t;
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typedef struct glyphset_s {
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glyphobj_t *glyphs;
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uint32_t count;
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} glyphset_t;
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enum {
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// all the glyphs in a passage. Always on only the root view of the passage.
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text_passage_glyphs,
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// glyphs for a single text object
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text_glyphs,
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// text_script, text_font and text_features on the passage root object set
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// the defaults for all text objects in the passage. The settings can be
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// overridden at the paragraph level or individual text object level by
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// adding the appropriate component to that text object.
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// script settings for the text object
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text_script,
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// font id for the text object
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text_font,
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// harfbuzz font features for the text object
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text_features,
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text_comp_count
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};
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extern const component_t text_components[text_comp_count];
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typedef struct featureset_s DARRAY_TYPE (hb_feature_t) featureset_t;
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extern hb_feature_t LigatureOff;
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extern hb_feature_t LigatureOn;
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extern hb_feature_t KerningOff;
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extern hb_feature_t KerningOn;
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extern hb_feature_t CligOff;
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extern hb_feature_t CligOn;
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struct font_s;
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struct passage_s;
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typedef struct text_system_s {
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ecs_registry_t *reg;
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uint32_t view_base;
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uint32_t text_base;
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} text_system_t;
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struct view_s Text_PassageView (text_system_t textsys,
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struct font_s *font, struct passage_s *passage);
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struct view_s Text_StringView (text_system_t textsys, struct view_s parent,
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struct font_s *font,
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const char *str, uint32_t len,
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script_component_t *sc, featureset_t *fs);
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void Text_SetScript (text_system_t textsys, uint32_t textid,
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const char *lang, hb_script_t script, text_dir_e dir);
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void Text_SetFont (text_system_t textsys, uint32_t textid,
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struct font_s *font);
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void Text_SetFeatures (text_system_t textsys, uint32_t textid,
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featureset_t *features);
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void Text_AddFeature (text_system_t textsys, uint32_t textid,
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hb_feature_t feature);
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#endif//__QF_ui_text_h
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