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/*
* wrap.h
*
* Text wrapping, hyphenation, justification and shaping
*
* Copyright © 2014-2016 Thomas White <taw@bitwiz.org.uk>
*
* This file is part of Colloquium.
*
* Colloquium is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef WRAP_H
#define WRAP_H
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "frame.h"
#include "sc_interp.h"
#include "presentation.h"
enum wrap_box_type
{
WRAP_BOX_NOTHING,
WRAP_BOX_SENTINEL,
WRAP_BOX_PANGO,
WRAP_BOX_IMAGE,
WRAP_BOX_CALLBACK
};
/* Possible types of space following a wrap box */
enum wrap_box_space
{
WRAP_SPACE_INTERWORD, /* Normal inter-word space */
WRAP_SPACE_NONE, /* Box ends with an explicit hyphen or an SC
* block boundary */
WRAP_SPACE_EOP /* End of paragraph */
/* TODO: Space between sentences etc */
};
struct text_seg
{
PangoGlyphString *glyphs;
PangoAnalysis analysis;
/* Offset of this text segment into the wrap box */
int offs_char;
int len_chars;
/* Pango units */
int width;
int height;
int ascent;
};
/* A wrap box is a run of content - could be text, an image or so one - that is
* one logical unit as far as Colloquium is concerned. It might consist of
* multiple units, for example, in Pango's mind. */
struct wrap_box
{
enum wrap_box_type type;
int editable;
SCBlock *scblock;
int offs_char; /* offset (in characters, not bytes) into scblock */
/* Pango units */
int width;
int height;
int ascent;
enum wrap_box_space space; /* Type of "space" following box */
double sp; /* Calculated space (Pango units) after box */
/* For type == WRAP_BOX_PANGO */
PangoFont *font;
double col[4]; /* rgba colour */
int len_chars;
int n_segs;
struct text_seg *segs;
/* For type == WRAP_BOX_IMAGE */
char *filename;
/* For type == WRAP_BOX_CALLBACK */
SCCallbackDrawFunc draw_func;
SCCallbackClickFunc click_func;
void *bvp;
void *vp;
};
/* An actual wrap line, with geometry etc */
struct wrap_line
{
struct boxvec *boxes;
int width; /* Pango units */
int height; /* Pango units */
int ascent; /* Pango units */
int overfull;
int underfull;
int last_line;
};
extern int wrap_contents(struct frame *fr);
extern void get_cursor_pos(struct wrap_box *box, int pos,
double *xposd, double *yposd, double *line_height);
extern void find_cursor(struct frame *fr, double xposd, double yposd,
int *line, int *box, int *pos);
extern int alloc_boxes(struct wrap_line *l);
extern void initialise_line(struct wrap_line *l);
extern void wrap_line_free(struct wrap_line *l);
extern void show_boxes(struct boxvec *boxes);
extern double total_height(struct frame *fr);
extern int insert_box(struct wrap_line *l, int pos);
extern int which_segment(struct wrap_box *box, int pos, int *err);
#endif /* WRAP_H */
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