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/* -*- Mode: C; c-basic-offset: 2; indent-tabs-mode: nil -*-
*
* Pigment mapping matrix example
*
* Copyright © 2006, 2007, 2008 Fluendo Embedded S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Loïc Molinari <loic@fluendo.com>
*/
#include <pgm/pgm.h>
static PgmViewport *viewport = NULL;
/* Update fps text */
static gboolean
update_fps_text_cb (gpointer data)
{
PgmDrawable *txt = PGM_DRAWABLE (data);
gchar *fps_string;
guint fps;
pgm_viewport_get_frame_rate (viewport, &fps);
fps_string = g_strdup_printf ("%d FPS", fps);
pgm_text_set_markup (PGM_TEXT (txt), fps_string);
g_free (fps_string);
return TRUE;
}
/* Transform the mapping matrix of the image */
static gboolean
update_pass_cb (PgmViewport *viewport,
gpointer data)
{
PgmImage *image = PGM_IMAGE (data);
static PgmMat4x4 *mapping = NULL;
/* Get the current mapping matrix at the first call */
if (G_UNLIKELY (!mapping))
pgm_image_get_mapping_matrix (PGM_IMAGE (image), &mapping);
/* Rotate the matrix about 2° around z axis at the center of the image */
pgm_mat4x4_translate_from_scalars (mapping, 0.5f, 0.5f, 0.0f);
pgm_mat4x4_rotate_x (mapping, (gfloat) G_PI / 180.0f);
pgm_mat4x4_rotate_y (mapping, (gfloat) G_PI / 180.0f);
pgm_mat4x4_rotate_z (mapping, (gfloat) G_PI / 180.0f);
pgm_mat4x4_translate_from_scalars (mapping, -0.5f, -0.5f, 0.0f);
/* Set the new mapping matrix */
pgm_image_set_mapping_matrix (PGM_IMAGE (image), mapping);
return TRUE;
}
/* key-press handler */
static void
keypress_event_cb (PgmViewport *viewport,
PgmEventKey *event,
gpointer data)
{
static gboolean decorated = TRUE;
if (event->type == PGM_KEY_PRESS)
{
switch (event->keyval)
{
/* Add/remove window decorations */
case PGM_d:
decorated = !decorated;
pgm_viewport_set_decorated (viewport, decorated);
break;
/* Handle quit */
case PGM_q:
case PGM_Escape:
pgm_main_quit ();
break;
default:
break;
}
}
}
/* Entry point */
int
main (int argc,
char *argv[])
{
const gchar *img_path = "examples/pictures/meiko.jpg";
PgmDrawable *img, *txt;
PgmCanvas *canvas;
/* Init */
pgm_init (&argc, &argv);
/* OpenGL viewport creation */
pgm_viewport_factory_make ("opengl", &viewport);
if (!viewport)
{
g_print ("Cannot create the 'opengl' viewport\n");
return -1;
}
pgm_viewport_set_size (viewport, 600, 600);
pgm_viewport_set_title (viewport, "Mapping matrix");
/* Image definition */
img = pgm_image_new_from_file (img_path, 0);
pgm_drawable_set_size (img, 400, 400);
pgm_drawable_set_position (img, 100, 100, 0);
pgm_drawable_set_bg_color (img, 0, 0, 255, 0);
pgm_drawable_show (img);
/* Text definition */
txt = pgm_text_new ("0 FPS");
pgm_text_set_weight (PGM_TEXT (txt), PGM_TEXT_WEIGHT_BOLD);
pgm_drawable_set_size (txt, 300, 20);
pgm_drawable_set_position (txt, 10, 0, 0);
pgm_drawable_set_bg_color (txt, 0, 0, 0, 0);
pgm_drawable_show (txt);
/* Canvas handling */
canvas = pgm_canvas_new ();
pgm_canvas_set_size (canvas, 600, 600);
pgm_viewport_set_canvas (viewport, canvas);
pgm_canvas_add_many (canvas, PGM_DRAWABLE_MIDDLE, img, txt, NULL);
/* Main loop */
g_signal_connect (G_OBJECT (viewport), "key-press-event",
G_CALLBACK (keypress_event_cb), NULL);
g_signal_connect (G_OBJECT (viewport), "delete-event",
G_CALLBACK (pgm_main_quit), NULL);
g_signal_connect (G_OBJECT (viewport), "update-pass",
G_CALLBACK (update_pass_cb), img);
pgm_viewport_show (viewport);
g_timeout_add (1000, update_fps_text_cb, txt);
pgm_main ();
/* Deinit */
gst_object_unref (canvas);
gst_object_unref (viewport);
pgm_deinit ();
return 0;
}
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