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/*
* slide_render.c
*
* Colloquium - A tiny presentation program
*
* Copyright (c) 2011 Thomas White <taw@bitwiz.org.uk>
*
* This program 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 <cairo.h>
#include <pango/pangocairo.h>
#include <assert.h>
#include "slide_render.h"
#include "presentation.h"
#include "objects.h"
static void render_text_object(cairo_t *cr, struct object *o)
{
int width, height;
o->layout = pango_cairo_create_layout(cr);
pango_layout_set_text(o->layout, o->text, -1);
o->fontdesc = pango_font_description_from_string("Sans 30");
pango_layout_set_font_description(o->layout, o->fontdesc);
pango_cairo_update_layout(cr, o->layout);
pango_layout_get_size(o->layout, &width, &height);
o->bb_width = width/PANGO_SCALE;
o->bb_height = height/PANGO_SCALE;
cairo_move_to(cr, o->x, o->y);
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
pango_cairo_show_layout(cr, o->layout);
}
void draw_caret(cairo_t *cr, struct object *o)
{
int line, xpos;
double xposd;
assert(o->type == TEXT);
pango_layout_index_to_line_x(o->layout, o->insertion_point,
0, &line, &xpos);
xposd = xpos/PANGO_SCALE;
cairo_move_to(cr, o->x+xposd, o->y);
cairo_line_to(cr, o->x+xposd, o->y+o->bb_height);
cairo_set_source_rgb(cr, 1.0, 0.5, 0.0);
cairo_set_line_width(cr, 2.0);
cairo_stroke(cr);
}
int render_slide(struct slide *s)
{
cairo_surface_t *surf;
cairo_t *cr;
int i;
surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
s->slide_width, s->slide_height);
cr = cairo_create(surf);
cairo_rectangle(cr, 0.0, 0.0, s->slide_width, s->slide_height);
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
cairo_fill(cr);
for ( i=0; i<s->num_objects; i++ ) {
struct object *o = s->objects[i];
switch ( o->type ) {
case TEXT :
render_text_object(cr, o);
break;
}
}
cairo_destroy(cr);
if ( s->render_cache != NULL ) cairo_surface_destroy(s->render_cache);
s->render_cache = surf;
s->render_cache_seq = s->object_seq;
return 0;
}
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