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/* ghosd -- OSD with fake transparency, cairo, and pango.
* Copyright (C) 2006 Evan Martin <martine@danga.com>
*/
#include <stdio.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <time.h>
#include <cairo/cairo.h>
#include <ghosd/ghosd.h>
typedef struct {
cairo_surface_t* foot;
float alpha;
} RenderData;
static void
round_rect(cairo_t *cr, int x, int y, int w, int h, int r) {
cairo_move_to(cr, x+r, y);
cairo_line_to(cr, x+w-r, y); /* top edge */
cairo_curve_to(cr, x+w, y, x+w, y, x+w, y+r);
cairo_line_to(cr, x+w, y+h-r); /* right edge */
cairo_curve_to(cr, x+w, y+h, x+w, y+h, x+w-r, y+h);
cairo_line_to(cr, x+r, y+h); /* bottom edge */
cairo_curve_to(cr, x, y+h, x, y+h, x, y+h-r);
cairo_line_to(cr, x, y+r); /* left edge */
cairo_curve_to(cr, x, y, x, y, x+r, y);
cairo_close_path(cr);
}
#define RADIUS 20
static void
render(Ghosd *ghosd, cairo_t *cr, void* data) {
RenderData *rdata = data;
cairo_set_source_rgba(cr, rdata->alpha, 0, 0, 0.5);
cairo_new_path(cr);
round_rect(cr, 10, 10, 180, 230, RADIUS);
cairo_fill(cr);
cairo_set_source_rgba(cr, 1, 1, 1, 1.0);
cairo_new_path(cr);
round_rect(cr, 20, 20, 160, 210, RADIUS);
cairo_stroke(cr);
cairo_save(cr);
cairo_set_source_rgba(cr, 1, 1, 1, 1.0);
cairo_set_source_surface(cr, rdata->foot, 30, 30);
cairo_paint(cr);
cairo_restore(cr);
}
int main(int argc, char* argv[]) {
Ghosd *ghosd;
RenderData data = {0};
const char *image = "/usr/share/pixmaps/gnome-background-image.png";
data.foot = cairo_image_surface_create_from_png(image);
data.alpha = 0.5;
ghosd = ghosd_new();
ghosd_set_position(ghosd, 50, 50, 200, 240);
ghosd_set_render(ghosd, render, &data);
ghosd_render(ghosd);
ghosd_show(ghosd);
ghosd_main_iterations(ghosd);
const int STEP = 50;
float dalpha = 0.05;
struct timeval tv_nextupdate;
for (;;) {
gettimeofday(&tv_nextupdate, NULL);
tv_nextupdate.tv_usec += STEP*1000;
ghosd_main_until(ghosd, &tv_nextupdate);
data.alpha += dalpha;
if (data.alpha >= 1.0) {
data.alpha = 1.0;
dalpha = -dalpha;
} else if (data.alpha <= 0.0) {
data.alpha = 0.0;
dalpha = -dalpha;
}
ghosd_render(ghosd);
}
return 0;
}
/* vim: set ts=2 sw=2 et cino=(0 : */
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