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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"
#include "stylesheet.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);
}
}
static cairo_surface_t *render_slide(struct slide *s, int w, int h)
{
cairo_surface_t *surf;
cairo_t *cr;
int i;
surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
cr = cairo_create(surf);
cairo_scale(cr, w/s->parent->slide_width, h/s->parent->slide_height);
for ( i=0; i<s->parent->ss->n_bgblocks; i++ ) {
render_bgblock(cr, &s->parent->ss->bgblocks[i]);
}
for ( i=0; i<s->num_objects; i++ ) {
struct object *o = s->objects[i];
o->render_object(cr, o);
}
cairo_destroy(cr);
return surf;
}
void redraw_slide(struct slide *s)
{
int w, h;
if ( s->rendered_thumb != NULL ) {
cairo_surface_destroy(s->rendered_thumb);
}
w = s->parent->thumb_slide_width;
h = (s->parent->slide_height/s->parent->slide_width) * w;
s->rendered_thumb = render_slide(s, w, h);
/* FIXME: Request redraw for slide sorter if open */
/* Is this slide currently open in the editor? */
if ( s == s->parent->cur_edit_slide ) {
GtkWidget *da;
if ( s->rendered_edit != NULL ) {
cairo_surface_destroy(s->rendered_edit);
}
w = s->parent->edit_slide_width;
h = (s->parent->slide_height/s->parent->slide_width) * w;
s->rendered_edit = render_slide(s, w, h);
da = s->parent->drawingarea;
if ( da != NULL ) {
gdk_window_invalidate_rect(da->window, NULL, FALSE);
}
}
/* Is this slide currently being displayed on the projector? */
if ( s == s->parent->cur_proj_slide ) {
GtkWidget *da;
if ( s->rendered_proj != NULL ) {
cairo_surface_destroy(s->rendered_proj);
}
w = s->parent->proj_slide_width;
h = (s->parent->slide_height/s->parent->slide_width) * w;
s->rendered_proj = render_slide(s, w, h);
da = s->parent->ss_drawingarea;
if ( da != NULL ) {
gdk_window_invalidate_rect(da->window, NULL, FALSE);
}
}
}
void draw_rubberband_box(cairo_t *cr, double x, double y,
double width, double height)
{
cairo_new_path(cr);
cairo_rectangle(cr, x, y, width, height);
cairo_set_source_rgb(cr, 0.5, 0.5, 0.5);
cairo_set_line_width(cr, 0.5);
cairo_stroke(cr);
}
void draw_resize_handle(cairo_t *cr, double x, double y)
{
cairo_new_path(cr);
cairo_rectangle(cr, x, y, 20.0, 20.0);
cairo_set_source_rgba(cr, 0.9, 0.9, 0.9, 0.5);
cairo_fill(cr);
}
void draw_editing_box(cairo_t *cr, double xmin, double ymin,
double width, double height)
{
const double dash[] = {2.0, 2.0};
cairo_new_path(cr);
cairo_rectangle(cr, xmin-5.0, ymin-5.0, width+10.0, height+10.0);
cairo_set_source_rgb(cr, 0.0, 0.69, 1.0);
cairo_set_line_width(cr, 0.5);
cairo_stroke(cr);
cairo_new_path(cr);
cairo_rectangle(cr, xmin, ymin, width, height);
cairo_set_dash(cr, dash, 2, 0.0);
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
cairo_set_line_width(cr, 0.1);
cairo_stroke(cr);
cairo_set_dash(cr, NULL, 0, 0.0);
}
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