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/*
* render.c
*
* Copyright © 2013-2019 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 <cairo.h>
#include <cairo-pdf.h>
#include <pango/pangocairo.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "presentation.h"
#include "slide.h"
#include "narrative.h"
#include "stylesheet.h"
#include "imagestore.h"
#include "slide_priv.h"
static double lcalc(struct length l, double pd)
{
if ( l.unit == LENGTH_UNIT ) {
return l.len;
} else {
return l.len * pd;
}
}
static PangoAlignment to_pangoalignment(enum alignment align)
{
switch ( align ) {
case ALIGN_LEFT : return PANGO_ALIGN_LEFT;
case ALIGN_RIGHT : return PANGO_ALIGN_RIGHT;
case ALIGN_CENTER : return PANGO_ALIGN_CENTER;
default: return PANGO_ALIGN_LEFT;
}
}
static void render_text(struct slide_item *item, cairo_t *cr, PangoContext *pc,
Stylesheet *ss, enum style_element el,
double parent_w, double parent_h)
{
int i;
double x, y, w;
double pad_l, pad_r, pad_t;
struct length pad[4];
const char *font;
enum alignment align;
double fgcol[4];
PangoRectangle rect;
PangoFontDescription *fontdesc;
PangoAlignment palignment;
x = lcalc(item->geom.x, parent_w);
y = lcalc(item->geom.y, parent_h);
w = lcalc(item->geom.w, parent_w);
if ( stylesheet_get_padding(ss, el, pad) ) return;
pad_l = lcalc(pad[0], parent_w);
pad_r = lcalc(pad[1], parent_w);
pad_t = lcalc(pad[2], parent_h);
font = stylesheet_get_font(ss, el, fgcol, &align);
if ( font == NULL ) return;
fontdesc = pango_font_description_from_string(font);
if ( item->layouts == NULL ) {
item->layouts = malloc(item->n_paras*sizeof(PangoLayout *));
if ( item->layouts == NULL ) return;
for ( i=0; i<item->n_paras; i++ ) {
item->layouts[i] = NULL;
}
}
if ( item->align == ALIGN_INHERIT ) {
/* Use value from stylesheet */
palignment = to_pangoalignment(align);
} else {
/* Use item-specific value */
palignment = to_pangoalignment(item->align);
}
/* FIXME: Apply background */
cairo_save(cr);
cairo_translate(cr, x, y);
cairo_translate(cr, pad_l, pad_t);
for ( i=0; i<item->n_paras; i++ ) {
if ( item->layouts[i] == NULL ) {
item->layouts[i] = pango_layout_new(pc);
}
pango_layout_set_width(item->layouts[i],
pango_units_from_double(w-pad_l-pad_r));
pango_layout_set_text(item->layouts[i], item->paragraphs[i], -1);
pango_layout_set_alignment(item->layouts[i], palignment);
pango_layout_set_font_description(item->layouts[i], fontdesc);
/* FIXME: Handle *bold*, _underline_, /italic/ etc. */
//pango_layout_set_attributes(item->layouts[i], attrs);
//pango_attr_list_unref(attrs);
/* FIXME: Clip to w,h */
cairo_set_source_rgba(cr, fgcol[0], fgcol[1], fgcol[2], fgcol[3]);
cairo_move_to(cr, 0.0, 0.0);
pango_cairo_update_layout(cr, item->layouts[i]);
pango_cairo_show_layout(cr, item->layouts[i]);
pango_layout_get_extents(item->layouts[i], NULL, &rect);
cairo_translate(cr, 0.0, pango_units_to_double(rect.height));
cairo_fill(cr);
}
cairo_restore(cr);
}
static void render_image(struct slide_item *item, cairo_t *cr,
Stylesheet *ss, ImageStore *is,
double parent_w, double parent_h)
{
double x, y, w, h;
double wd, hd;
cairo_surface_t *surf;
x = lcalc(item->geom.x, parent_w);
y = lcalc(item->geom.y, parent_h);
w = lcalc(item->geom.w, parent_w);
h = lcalc(item->geom.h, parent_h);
wd = w; hd = h;
cairo_user_to_device_distance(cr, &wd, &hd);
surf = lookup_image(is, item->filename, wd);
if ( surf == NULL ) return;
cairo_user_to_device(cr, &x, &y);
x = rint(x); y = rint(y);
cairo_device_to_user(cr, &x, &y);
cairo_save(cr);
cairo_new_path(cr);
cairo_rectangle(cr, x, y, w, h);
cairo_translate(cr, x, y);
cairo_scale(cr, w/wd, h/hd);
cairo_set_source_surface(cr, surf, 0.0, 0.0);
cairo_pattern_t *patt = cairo_get_source(cr);
cairo_pattern_set_extend(patt, CAIRO_EXTEND_NONE);
cairo_pattern_set_filter(patt, CAIRO_FILTER_BEST);
cairo_fill(cr);
cairo_restore(cr);
}
int slide_render_cairo(Slide *s, cairo_t *cr, ImageStore *is, Stylesheet *stylesheet,
int slide_number, PangoLanguage *lang, PangoContext *pc)
{
int i, r;
enum gradient bg;
double bgcol[4];
double bgcol2[4];
cairo_pattern_t *patt = NULL;
double w, h;
r = stylesheet_get_background(stylesheet, STYEL_SLIDE, &bg, bgcol, bgcol2);
if ( r ) return 1;
slide_get_logical_size(s, stylesheet, &w, &h);
/* Overall background */
cairo_rectangle(cr, 0.0, 0.0, w, h);
switch ( bg ) {
case GRAD_NONE:
cairo_set_source_rgb(cr, bgcol[0], bgcol[1], bgcol[2]);
break;
case GRAD_VERT:
patt = cairo_pattern_create_linear(0.0, 0.0, 0.0, h);
cairo_pattern_add_color_stop_rgb(patt, 0.0, bgcol[0], bgcol[1], bgcol[2]);
cairo_pattern_add_color_stop_rgb(patt, 1.0, bgcol2[0], bgcol2[1], bgcol2[2]);
cairo_set_source(cr, patt);
break;
case GRAD_HORIZ:
patt = cairo_pattern_create_linear(0.0, 0.0, w, 0.0);
cairo_pattern_add_color_stop_rgb(patt, 0.0, bgcol[0], bgcol[1], bgcol[2]);
cairo_pattern_add_color_stop_rgb(patt, 1.0, bgcol2[0], bgcol2[1], bgcol2[2]);
cairo_set_source(cr, patt);
break;
default:
fprintf(stderr, "Unrecognised slide background type %i\n", bg);
break;
}
cairo_fill(cr);
for ( i=0; i<s->n_items; i++ ) {
switch ( s->items[i].type ) {
case SLIDE_ITEM_TEXT :
render_text(&s->items[i], cr, pc, stylesheet, STYEL_SLIDE_TEXT,
w, h);
break;
case SLIDE_ITEM_IMAGE :
render_image(&s->items[i], cr, stylesheet, is,
w, h);
break;
case SLIDE_ITEM_SLIDETITLE :
render_text(&s->items[i], cr, pc, stylesheet, STYEL_SLIDE_SLIDETITLE,
w, h);
break;
case SLIDE_ITEM_PRESTITLE :
render_text(&s->items[i], cr, pc, stylesheet, STYEL_SLIDE_PRESTITLE,
w, h);
break;
default :
break;
}
}
return 0;
}
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