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/*
* shape.c
*
* Copyright © 2014 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/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <pango/pangocairo.h>
#include "wrap.h"
#include "sc_interp.h"
#include "shape.h"
struct box_adding_stuff
{
struct wrap_line *line;
SCInterpreter *scin;
int editable;
const char *text;
enum wrap_box_space space;
SCBlock *bl;
size_t offs;
};
static void add_wrap_box(gpointer vi, gpointer vb)
{
struct wrap_box *box;
PangoRectangle rect;
double *col;
PangoItem *item = vi;
struct box_adding_stuff *bas = vb;
if ( bas->line->n_boxes == bas->line->max_boxes ) {
bas->line->max_boxes += 32;
alloc_boxes(bas->line);
if ( bas->line->n_boxes == bas->line->max_boxes ) return;
}
box = &bas->line->boxes[bas->line->n_boxes];
box->type = WRAP_BOX_PANGO;
box->space = bas->space;
box->font = sc_interp_get_font(bas->scin);
box->width = 0;
box->editable = bas->editable;
box->ascent = sc_interp_get_ascent(bas->scin);
box->height = sc_interp_get_height(bas->scin);
box->scblock = bas->bl;
box->offs_char = g_utf8_pointer_to_offset(bas->text,
bas->text+item->offset+bas->offs);
box->len_chars = g_utf8_strlen(bas->text+item->offset+bas->offs,
item->length);
col = sc_interp_get_fgcol(bas->scin);
box->col[0] = col[0]; /* Red */
box->col[1] = col[1]; /* Green */
box->col[2] = col[2]; /* Blue */
box->col[3] = col[3]; /* Alpha */
box->glyphs = pango_glyph_string_new();
box->item = item;
pango_shape(bas->text+bas->offs+item->offset, item->length,
&item->analysis, box->glyphs);
pango_glyph_string_extents(box->glyphs, box->font, NULL, &rect);
box->width += rect.width;
if ( rect.height > box->height ) {
box->height = rect.height;
}
if ( PANGO_ASCENT(rect) > box->ascent ) {
box->ascent = PANGO_ASCENT(rect);
}
bas->line->n_boxes++;
}
/* Add "text", followed by a space of type "space", to "line" */
static int add_wrap_boxes(struct wrap_line *line, const char *text,
enum wrap_box_space space, PangoContext *pc,
SCInterpreter *scin, SCBlock *bl, size_t offs,
size_t len, int editable)
{
GList *pango_items;
PangoAttrList *attrs;
PangoAttribute *attr;
struct box_adding_stuff bas;
attrs = pango_attr_list_new();
attr = pango_attr_font_desc_new(sc_interp_get_fontdesc(scin));
pango_attr_list_insert_before(attrs, attr);
pango_items = pango_itemize(pc, text+offs, 0, len, attrs, NULL);
bas.line = line;
bas.scin = scin;
bas.editable = editable;
bas.text = text;
bas.space = space;
bas.bl = bl;
bas.offs = offs;
g_list_foreach(pango_items, add_wrap_box, &bas);
g_list_free(pango_items);
pango_attr_list_unref(attrs);
return 0;
}
void add_image_box(struct wrap_line *line, const char *filename,
int w, int h, int editable)
{
struct wrap_box *box;
box = &line->boxes[line->n_boxes];
box->type = WRAP_BOX_IMAGE;
box->scblock = NULL;
box->offs_char = 0;
box->space = WRAP_SPACE_NONE;
box->width = pango_units_from_double(w);
box->ascent = pango_units_from_double(h);
box->height = pango_units_from_double(h);
box->filename = strdup(filename);
box->editable = editable;
line->n_boxes++;
}
int split_words(struct wrap_line *boxes, PangoContext *pc, SCBlock *bl,
const char *text, PangoLanguage *lang, int editable,
SCInterpreter *scin)
{
PangoLogAttr *log_attrs;
glong len_chars, i;
size_t len_bytes, start;
/* Empty block? */
if ( text == NULL ) return 1;
len_chars = g_utf8_strlen(text, -1);
if ( len_chars == 0 ) return 1;
len_bytes = strlen(text);
log_attrs = malloc((len_chars+1)*sizeof(PangoLogAttr));
if ( log_attrs == NULL ) return 1;
/* Create glyph string */
pango_get_log_attrs(text, len_bytes, -1, lang, log_attrs, len_chars+1);
start = 0;
for ( i=0; i<len_chars; i++ ) {
if ( log_attrs[i].is_line_break ) {
enum wrap_box_space type;
size_t len;
char *ptr;
size_t offs;
ptr = g_utf8_offset_to_pointer(text, i);
offs = ptr - text;
/* Stuff up to (but not including) sc[i] forms a
* wrap box */
len = offs - start;
if ( log_attrs[i].is_mandatory_break ) {
type = WRAP_SPACE_EOP;
if ( (offs>0) && (text[offs-1] == '\n') ) len--;
if ( (offs>0) && (text[offs-1] == '\r') ) len--;
} else if ( (i>0)
&& log_attrs[i-1].is_expandable_space ) {
type = WRAP_SPACE_INTERWORD;
len--; /* Not interested in spaces */
} else {
type = WRAP_SPACE_NONE;
}
if ( add_wrap_boxes(boxes, text, type, pc, scin, bl,
start, len, editable) ) {
fprintf(stderr, "Failed to add wrap box.\n");
}
start = offs;
}
}
/* Add the stuff left over at the end */
if ( i > start ) {
size_t l = strlen(text+start);
if ( (text[start+l-1] == '\n') ) {
/* There is a newline at the end of the SC */
add_wrap_boxes(boxes, text,
WRAP_SPACE_EOP, pc, scin, bl, start,
l-1, editable);
} else {
add_wrap_boxes(boxes, text,
WRAP_SPACE_NONE, pc, scin, bl, start,
l, editable);
}
}
free(log_attrs);
return 0;
}
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