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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"
static void shape_and_measure(gpointer data, gpointer user_data)
{
struct wrap_box *box = user_data;
PangoItem *item = data;
PangoRectangle rect;
/* FIXME: Don't assume only one run per wrap box */
box->glyphs = pango_glyph_string_new();
box->item = item;
pango_shape(box->text+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);
}
}
/* Add "text", followed by a space of type "space", to "line" */
static int add_wrap_box(struct wrap_line *line, char *text, size_t offset,
enum wrap_box_space space, PangoContext *pc,
SCInterpreter *scin, int editable)
{
GList *pango_items;
struct wrap_box *box;
PangoAttrList *attrs;
PangoAttribute *attr;
double *col;
if ( line->n_boxes == line->max_boxes ) {
line->max_boxes += 32;
alloc_boxes(line);
if ( line->n_boxes == line->max_boxes ) return 1;
}
box = &line->boxes[line->n_boxes];
if ( !editable ) offset = 0;
box->sc_offset = offset;
box->type = WRAP_BOX_PANGO;
box->text = text;
box->space = space;
box->font = sc_interp_get_font(scin);
box->width = 0;
box->editable = editable;
box->ascent = sc_interp_get_ascent(scin);
box->height = sc_interp_get_height(scin);
col = sc_interp_get_fgcol(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 */
line->n_boxes++;
if ( strlen(text) == 0 ) {
box->type = WRAP_BOX_NOTHING;
return 0;
}
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, 0, strlen(text), attrs, NULL);
g_list_foreach(pango_items, shape_and_measure, box);
g_list_free(pango_items);
pango_attr_list_unref(attrs);
return 0;
}
static void add_image_box(struct wrap_line *line, const char *filename,
size_t offset, int w, int h, int editable)
{
struct wrap_box *box;
box = &line->boxes[line->n_boxes];
if ( !editable ) offset = 0;
box->sc_offset = offset;
box->type = WRAP_BOX_IMAGE;
box->text = NULL;
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, 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 ) {
char *word;
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;
}
word = strndup(text+start, len);
if ( word == NULL ) {
fprintf(stderr, "strndup() failed.\n");
free(log_attrs);
return 1;
}
if ( add_wrap_box(boxes, word, start, type,
pc, scin, editable) ) {
fprintf(stderr, "Failed to add wrap box.\n");
}
start = offs;
}
}
if ( i > start ) {
char *word;
size_t l;
word = strdup(text+start); /* to the end */
if ( word == NULL ) {
fprintf(stderr, "strndup() failed.\n");
free(log_attrs);
return 1;
}
l = strlen(word);
if ( (word[l-1] == '\n') ) {
/* There is a newline at the end of the SC */
char *word2;
word2 = strndup(word, l-1);
add_wrap_box(boxes, word2, start,
WRAP_SPACE_EOP, pc, scin, editable);
add_wrap_box(boxes, strdup(""), len_bytes,
WRAP_SPACE_NONE, pc, scin, editable);
} else {
add_wrap_box(boxes, word, start,
WRAP_SPACE_NONE, pc, scin, editable);
}
}
free(log_attrs);
return 0;
}
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