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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 <string.h>
#include "storycode.h"
#include "stylesheet.h"
#include "presentation.h"
#include "frame.h"
struct renderstuff
{
cairo_t *cr;
PangoContext *pc;
PangoFontMap *fontmap;
PangoFont *font;
struct frame *fr;
};
static void render_segment(gpointer data, gpointer user_data)
{
struct renderstuff *s = user_data;
PangoItem *item = data;
PangoGlyphString *glyphs;
GdkColor col;
glyphs = pango_glyph_string_new();
pango_shape(s->fr->sc+item->offset, item->length, &item->analysis,
glyphs);
/* FIXME: Honour alpha as well */
gdk_color_parse("#000000", &col);
gdk_cairo_set_source_color(s->cr, &col);
pango_cairo_show_glyph_string(s->cr, s->font, glyphs);
pango_glyph_string_free(glyphs);
pango_item_free(item);
}
/* Render Level 1 Storycode */
int render_sc(struct frame *fr, cairo_t *cr, double w, double h)
{
PangoFontDescription *fontdesc;
struct renderstuff s;
GList *list;
if ( fr->sc == NULL ) return 0;
s.pc = pango_cairo_create_context(cr);
s.fr = fr;
s.cr = cr;
/* Find and load font */
s.fontmap = pango_cairo_font_map_get_default();
fontdesc = pango_font_description_from_string("Serif 20");
s.font = pango_font_map_load_font(s.fontmap, s.pc, fontdesc);
if ( s.font == NULL ) {
fprintf(stderr, "Failed to load font.\n");
return 1;
}
/* Create glyph string */
list = pango_itemize(s.pc, fr->sc, 0, strlen(fr->sc), NULL, NULL);
g_list_foreach(list, render_segment, &s);
g_list_free(list);
pango_font_description_free(fontdesc);
g_object_unref(s.fontmap);
g_object_unref(s.pc);
return 0;
}
int render_frame(struct frame *fr, cairo_t *cr)
{
int i;
int d = 0;
/* 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 ) {
double w, h;
/* Draw the frame itself (rectangle) */
cairo_rectangle(cr, 0.0, 0.0, fr->w, fr->h);
if ( (fr->style != NULL)
&& (strcmp(fr->style->name, "Default") == 0) )
{
cairo_set_source_rgb(cr, 0.0, 0.0, 1.0);
} else {
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
}
cairo_fill_preserve(cr);
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
/* if draw_border */
//cairo_set_line_width(cr, 1.0);
//cairo_stroke(cr);
cairo_new_path(cr);
/* Set up padding, and then draw the contents */
cairo_move_to(cr, fr->lop.pad_l, fr->lop.pad_t);
w = fr->w - (fr->lop.pad_l + fr->lop.pad_r);
h = fr->h - (fr->lop.pad_t + fr->lop.pad_b);
render_sc(fr, cr, w, h);
d = 1;
continue;
}
/* Sort out the transformation for the margins */
cairo_translate(cr, fr->rendering_order[i]->offs_x,
fr->rendering_order[i]->offs_y);
render_frame(fr->rendering_order[i], cr);
}
if ( !d ) {
fprintf(stderr, "WARNING: Frame didn't appear on its own "
"rendering list?\n");
}
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;
surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
cr = cairo_create(surf);
cairo_rectangle(cr, 0.0, 0.0, w, h);
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
cairo_fill(cr);
cairo_rectangle(cr, 0.0, 0.0, w, h);
cairo_set_source_rgb(cr, 0.0, 0.0, 1.0);
cairo_set_line_width(cr, 1.0);
cairo_stroke(cr);
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);
printf("rendered to %p %ix%i\n", surf, w, h);
render_frame(s->top, cr);
cairo_font_options_destroy(fopts);
cairo_destroy(cr);
return surf;
}
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