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/*
* 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 <cairo-pdf.h>
#include <pango/pangocairo.h>
#include <assert.h>
#include <gdk/gdk.h>
#include "storycode.h"
#include "stylesheet.h"
#include "presentation.h"
static void render_bgblock(cairo_t *cr, struct bgblock *b)
{
GdkColor col1;
GdkColor col2;
cairo_pattern_t *patt = NULL;
double cx, cy, r, r1, r2;
cairo_rectangle(cr, b->min_x, b->min_y,
b->max_x - b->min_x,
b->max_y - b->min_y);
switch ( b->type ) {
case BGBLOCK_SOLID :
gdk_color_parse(b->colour1, &col1);
gdk_cairo_set_source_color(cr, &col1);
/* FIXME: Honour alpha as well */
cairo_fill(cr);
break;
case BGBLOCK_GRADIENT_CIRCULAR :
cx = b->min_x + (b->max_x-b->min_x)/2.0;
cy = b->min_y + (b->max_y-b->min_y)/2.0;
r1 = (b->max_x-b->min_x)/2.0;
r2 = (b->max_y-b->min_y)/2.0;
r = r1 > r2 ? r1 : r2;
patt = cairo_pattern_create_radial(cx, cy, r, cx, cy, 0.0);
/* Fall-through */
case BGBLOCK_GRADIENT_X :
if ( patt == NULL ) {
patt = cairo_pattern_create_linear(b->min_x, 0.0,
b->max_y, 0.0);
}
/* Fall-through */
case BGBLOCK_GRADIENT_Y :
if ( patt == NULL ) {
patt = cairo_pattern_create_linear(0.0, b->min_y,
0.0, b->max_y);
}
gdk_color_parse(b->colour1, &col1);
gdk_color_parse(b->colour2, &col2);
cairo_pattern_add_color_stop_rgba(patt, 0.0, col1.red/65535.0,
col1.green/65535.0,
col1.blue/65535.0,
b->alpha1);
cairo_pattern_add_color_stop_rgba(patt, 1.0, col2.red/65535.0,
col2.green/65535.0,
col2.blue/65535.0,
b->alpha2);
cairo_set_source(cr, patt);
cairo_fill(cr);
cairo_pattern_destroy(patt);
break;
case BGBLOCK_IMAGE :
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
cairo_fill(cr);
}
}
/* Render Level 1 Storycode */
int render_sc(const char *sc, cairo_t *cr, double w, double h, PangoContext *pc)
{
PangoLayout *layout;
PangoFontDescription *fontdesc;
GdkColor col;
cairo_rectangle(cr, 0.0, 0.0, w, h);
cairo_set_line_width(cr, 0.1);
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
cairo_stroke(cr);
/* FIXME: Check for Level 1 markup e.g. image */
layout = pango_layout_new(pc);
pango_cairo_update_layout(cr, layout);
pango_layout_set_width(layout, w*PANGO_SCALE);
pango_layout_set_height(layout, h*PANGO_SCALE);
pango_layout_set_justify(layout, 1);
pango_layout_set_ellipsize(layout, 1);
pango_layout_set_text(layout, sc, -1);
fontdesc = pango_font_description_from_string("Sans 12");
pango_layout_set_font_description(layout, fontdesc);
cairo_move_to(cr, 0.0, 0.0);
/* FIXME: Honour alpha as well */
gdk_color_parse("#000000", &col);
gdk_cairo_set_source_color(cr, &col);
pango_cairo_show_layout(cr, layout);
pango_font_description_free(fontdesc);
g_object_unref(G_OBJECT(layout));
return 0;
}
int render_frame(struct frame *fr, cairo_t *cr, PangoContext *pc)
{
int i;
/* The rendering order is a list of children, but it also contains the
* current frame. In this way, it contains information about which
* layer the current frame is to be rendered as relative to its
* children. */
for ( i=0; i<fr->num_ro; i++ ) {
if ( fr->rendering_order[i] == fr ) {
render_sc(fr->sc, cr, fr->w, fr->h, pc);
continue;
}
/* Sort out the transformation for the margins */
cairo_translate(cr, fr->rendering_order[i]->x,
fr->rendering_order[i]->y);
render_frame(fr->rendering_order[i], cr, pc);
}
return 0;
}
cairo_surface_t *render_slide(struct slide *s, int w, int h)
{
cairo_surface_t *surf;
cairo_t *cr;
cairo_font_options_t *fopts;
int i;
surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
cr = cairo_create(surf);
cairo_scale(cr, w, h);
fopts = cairo_font_options_create();
cairo_font_options_set_hint_style(fopts, CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_hint_metrics(fopts, CAIRO_HINT_METRICS_OFF);
cairo_font_options_set_antialias(fopts, CAIRO_ANTIALIAS_SUBPIXEL);
cairo_set_font_options(cr, fopts);
for ( i=0; i<s->st->n_bgblocks; i++ ) {
render_bgblock(cr, s->st->bgblocks[i]);
}
render_frame(s->top, cr, NULL); /* FIXME: pc */
cairo_font_options_destroy(fopts);
cairo_destroy(cr);
return surf;
}
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