gstreamer/gst/games/gstpuzzle.c
Thomas Vander Stichele bdb814f6ef expand tabs
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2005-12-06 19:55:58 +00:00

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16 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2003> David Schleef <ds@schleef.org>
* <2004> Benjamin Otte <otte@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gstvideofilter.h>
#include "gstvideoimage.h"
#include <string.h>
#define GST_TYPE_PUZZLE \
(gst_puzzle_get_type())
#define GST_PUZZLE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PUZZLE,GstPuzzle))
#define GST_PUZZLE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PUZZLE,GstPuzzleClass))
#define GST_IS_PUZZLE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PUZZLE))
#define GST_IS_PUZZLE_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PUZZLE))
typedef struct _GstPuzzle GstPuzzle;
typedef struct _GstPuzzleClass GstPuzzleClass;
struct _GstPuzzle
{
GstVideofilter videofilter;
const GstVideoFormat *format;
/* properties */
guint rows;
guint columns;
guint tiles;
/* state */
guint *permutation;
guint position;
gboolean solved;
};
struct _GstPuzzleClass
{
GstVideofilterClass parent_class;
};
/* GstPuzzle signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_COLUMNS,
ARG_ROWS
/* FILL ME */
};
static void gst_puzzle_base_init (gpointer g_class);
static void gst_puzzle_class_init (gpointer g_class, gpointer class_data);
static void gst_puzzle_init (GTypeInstance * instance, gpointer g_class);
static void gst_puzzle_finalize (GObject * object);
static void gst_puzzle_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_puzzle_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_puzzle_setup (GstVideofilter * videofilter);
static void draw_puzzle (GstVideofilter * videofilter, void *destp, void *srcp);
static GstVideofilterClass *parent_class;
GType
gst_puzzle_get_type (void)
{
static GType puzzle_type = 0;
if (!puzzle_type) {
static const GTypeInfo puzzle_info = {
sizeof (GstPuzzleClass),
gst_puzzle_base_init,
NULL,
gst_puzzle_class_init,
NULL,
NULL,
sizeof (GstPuzzle),
0,
gst_puzzle_init,
};
puzzle_type = g_type_register_static (GST_TYPE_VIDEOFILTER,
"GstPuzzle", &puzzle_info, 0);
}
return puzzle_type;
}
static void
gst_puzzle_base_init (gpointer g_class)
{
static GstElementDetails puzzle_details =
GST_ELEMENT_DETAILS ("a simple puzzle",
"Filter/Effect/Video/Games",
"A simple puzzle, use arrow keys and space to restart/solve",
"Benjamin Otte <otte@gnome.org>");
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstVideofilterClass *videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
int i;
GstVideofilterFormat *f;
gst_element_class_set_details (element_class, &puzzle_details);
for (i = 0; i < gst_video_format_count; i++) {
f = g_new0 (GstVideofilterFormat, 1);
f->fourcc = gst_video_format_list[i].fourcc;
f->bpp = gst_video_format_list[i].bitspp;
f->filter_func = draw_puzzle;
if (gst_video_format_list[i].ext_caps) {
f->depth = gst_video_format_list[i].depth;
f->endianness =
gst_video_format_list[i].bitspp < 24 ? G_BYTE_ORDER : G_BIG_ENDIAN;
f->red_mask = gst_video_format_list[i].red_mask;
f->green_mask = gst_video_format_list[i].green_mask;
f->blue_mask = gst_video_format_list[i].blue_mask;
}
gst_videofilter_class_add_format (videofilter_class, f);
}
gst_videofilter_class_add_pad_templates (GST_VIDEOFILTER_CLASS (g_class));
}
static void
gst_puzzle_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
GstVideofilterClass *videofilter_class;
gobject_class = G_OBJECT_CLASS (g_class);
videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
parent_class = g_type_class_peek_parent (g_class);
gobject_class->set_property = gst_puzzle_set_property;
gobject_class->get_property = gst_puzzle_get_property;
gobject_class->finalize = gst_puzzle_finalize;
g_object_class_install_property (gobject_class, ARG_ROWS,
g_param_spec_uint ("rows", "rows", "number of rows in puzzle",
1, G_MAXUINT, 4, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (gobject_class, ARG_COLUMNS,
g_param_spec_uint ("columns", "columns", "number of columns in puzzle",
1, G_MAXUINT, 4, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
videofilter_class->setup = gst_puzzle_setup;
}
static void
gst_puzzle_finalize (GObject * object)
{
GstPuzzle *puzzle;
puzzle = GST_PUZZLE (object);
g_free (puzzle->permutation);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void G_GNUC_UNUSED
gst_puzzle_solve (GstPuzzle * puzzle)
{
guint i;
for (i = 0; i < puzzle->tiles; i++) {
puzzle->permutation[i] = i;
}
puzzle->position = puzzle->tiles - 1;
puzzle->solved = TRUE;
}
static gboolean
gst_puzzle_is_solved (GstPuzzle * puzzle)
{
guint i;
if (puzzle->position != puzzle->tiles - 1)
return FALSE;
for (i = 0; i < puzzle->tiles; i++) {
if (puzzle->permutation[i] != i)
return FALSE;
}
return TRUE;
}
#if 0
static void
gst_puzzle_show (GstPuzzle * puzzle)
{
guint i;
for (i = 0; i < puzzle->tiles; i++) {
g_print ("%d ", puzzle->permutation[i]);
}
g_print ("\n");
}
#endif
static void
gst_puzzle_swap (GstPuzzle * puzzle, guint next)
{
guint tmp;
g_assert (next < puzzle->tiles);
tmp = puzzle->permutation[puzzle->position];
puzzle->permutation[puzzle->position] = puzzle->permutation[next];
puzzle->permutation[next] = tmp;
puzzle->position = next;
}
typedef enum
{
DIR_UP,
DIR_DOWN,
DIR_LEFT,
DIR_RIGHT
} GstPuzzleDirection;
static void
gst_puzzle_move (GstPuzzle * puzzle, GstPuzzleDirection dir)
{
guint next = puzzle->tiles;
switch (dir) {
case DIR_UP:
if (puzzle->position >= puzzle->columns)
next = puzzle->position - puzzle->columns;
break;
case DIR_DOWN:
if (puzzle->tiles - puzzle->position > puzzle->columns)
next = puzzle->position + puzzle->columns;
break;
case DIR_LEFT:
if ((puzzle->position % puzzle->columns) > 0)
next = puzzle->position - 1;
break;
case DIR_RIGHT:
if ((puzzle->position % puzzle->columns) < puzzle->columns - 1)
next = puzzle->position + 1;
break;
default:
g_assert_not_reached ();
}
if (next < puzzle->tiles) {
/* the move was valid */
gst_puzzle_swap (puzzle, next);
}
}
static void
gst_puzzle_shuffle (GstPuzzle * puzzle)
{
guint i;
do {
for (i = 0; i < 100 * puzzle->tiles; i++) {
gst_puzzle_move (puzzle, g_random_int_range (0, 4));
}
} while (gst_puzzle_is_solved (puzzle));
puzzle->solved = FALSE;
}
/* The nav event handler handles nav events, but still forwards them, so you
* should be able to even use puzzle while navigating a dvd menu. We return
* TRUE of course even when noone downstream handles the event.
*/
static gboolean
nav_event_handler (GstPad * pad, GstEvent * event)
{
GstPuzzle *puzzle;
GstVideofilter *filter;
const gchar *type;
gboolean result = FALSE;
gdouble x, y;
gint xpos = 0, ypos = 0;
puzzle = GST_PUZZLE (gst_pad_get_parent (pad));
filter = GST_VIDEOFILTER (puzzle);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
/* translate the event */
if (gst_structure_get_double (event->event_data.structure.structure,
"pointer_x", &x) &&
gst_structure_get_double (event->event_data.structure.structure,
"pointer_y", &y)) {
gint width, height;
width = gst_videofilter_get_input_width (filter);
height = gst_videofilter_get_input_height (filter);
width = (width / puzzle->columns) & ~3;
height = (height / puzzle->rows) & ~3;
xpos = (int) x / width;
ypos = (int) y / height;
if (xpos >= 0 && xpos < puzzle->columns && ypos >= 0
&& ypos < puzzle->rows) {
GstEvent *copy;
guint lookup;
lookup = puzzle->permutation[ypos * puzzle->columns + xpos];
GST_DEBUG_OBJECT (puzzle, "translated %dx%d (%gx%g) to %dx%d (%gx%g)",
xpos, ypos, x, y,
lookup % puzzle->columns, lookup / puzzle->columns,
x + ((gint) (lookup % puzzle->columns) - xpos) * width,
y + ((gint) (lookup / puzzle->columns) - ypos) * height);
x += ((gint) (lookup % puzzle->columns) - xpos) * width;
y += ((gint) (lookup / puzzle->columns) - ypos) * height;
copy = gst_event_copy (event);
gst_structure_set (copy->event_data.structure.structure,
"pointer_x", G_TYPE_DOUBLE, x,
"pointer_y", G_TYPE_DOUBLE, y, NULL);
gst_event_unref (event);
event = copy;
}
}
/* handle the event. NOTE: it has already been translated! */
type = gst_structure_get_string (event->event_data.structure.structure,
"event");
if (g_str_equal (type, "key-press")) {
const gchar *key =
gst_structure_get_string (event->event_data.structure.structure,
"key");
if (g_str_equal (key, "space")) {
if (gst_puzzle_is_solved (puzzle)) {
gst_puzzle_shuffle (puzzle);
} else {
gst_puzzle_solve (puzzle);
}
} else {
if (puzzle->solved)
break;
if (g_str_equal (key, "Left")) {
gst_puzzle_move (puzzle, DIR_LEFT);
} else if (g_str_equal (key, "Right")) {
gst_puzzle_move (puzzle, DIR_RIGHT);
} else if (g_str_equal (key, "Up")) {
gst_puzzle_move (puzzle, DIR_UP);
} else if (g_str_equal (key, "Down")) {
gst_puzzle_move (puzzle, DIR_DOWN);
}
}
puzzle->solved = gst_puzzle_is_solved (puzzle);
} else if (g_str_equal (type, "mouse-button-press")) {
gint button;
if (gst_structure_get_int (event->event_data.structure.structure,
"button", &button)) {
if (button == 1) {
if (xpos >= 0 && xpos < puzzle->columns && ypos >= 0
&& ypos < puzzle->rows && !puzzle->solved) {
gst_puzzle_swap (puzzle, ypos * puzzle->columns + xpos);
puzzle->solved = gst_puzzle_is_solved (puzzle);
}
} else if (button == 2) {
if (puzzle->solved) {
gst_puzzle_shuffle (puzzle);
} else {
gst_puzzle_solve (puzzle);
}
puzzle->solved = gst_puzzle_is_solved (puzzle);
}
}
}
/* FIXME: only return TRUE for events we handle? */
result = TRUE;
break;
default:
break;
}
return gst_pad_event_default (pad, event) || result;
}
static void
gst_puzzle_create (GstPuzzle * puzzle)
{
guint i;
puzzle->tiles = puzzle->rows * puzzle->columns;
g_assert (puzzle->tiles);
g_free (puzzle->permutation);
puzzle->permutation = g_new (guint, puzzle->tiles);
for (i = 0; i < puzzle->tiles; i++) {
puzzle->permutation[i] = i;
}
puzzle->position = puzzle->tiles - 1;
/* shuffle a bit */
gst_puzzle_shuffle (puzzle);
}
static void
gst_puzzle_init (GTypeInstance * instance, gpointer g_class)
{
GstVideofilter *videofilter;
GstPuzzle *puzzle;
videofilter = GST_VIDEOFILTER (instance);
puzzle = GST_PUZZLE (instance);
/* FIXME: this is evil */
gst_pad_set_event_function (videofilter->srcpad, nav_event_handler);
/* set this so we don't crash when initializing */
puzzle->rows = 1;
puzzle->columns = 1;
}
static void
gst_puzzle_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPuzzle *src;
g_return_if_fail (GST_IS_PUZZLE (object));
src = GST_PUZZLE (object);
GST_DEBUG ("gst_puzzle_set_property");
switch (prop_id) {
case ARG_COLUMNS:
src->columns = g_value_get_uint (value);
gst_puzzle_create (src);
break;
case ARG_ROWS:
src->rows = g_value_get_uint (value);
gst_puzzle_create (src);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_puzzle_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstPuzzle *src;
g_return_if_fail (GST_IS_PUZZLE (object));
src = GST_PUZZLE (object);
switch (prop_id) {
case ARG_COLUMNS:
g_value_set_uint (value, src->columns);
break;
case ARG_ROWS:
g_value_set_uint (value, src->rows);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_puzzle_setup (GstVideofilter * videofilter)
{
GstPuzzle *puzzle;
g_return_if_fail (GST_IS_PUZZLE (videofilter));
puzzle = GST_PUZZLE (videofilter);
puzzle->format = NULL;
}
static void
draw_puzzle (GstVideofilter * videofilter, void *destp, void *srcp)
{
GstPuzzle *puzzle;
int width, height;
guint i;
GstVideoImage dest, src;
puzzle = GST_PUZZLE (videofilter);
if (!puzzle->format) {
puzzle->format =
gst_video_format_find_by_structure (gst_caps_get_structure
(gst_pad_get_negotiated_caps (videofilter->sinkpad), 0));
}
width = gst_videofilter_get_input_width (videofilter);
height = gst_videofilter_get_input_height (videofilter);
gst_video_image_setup (&dest, puzzle->format, destp, width, height);
gst_video_image_setup (&src, puzzle->format, srcp, width, height);
/* use multiples of 4 here to get around drawing problems with YUV colorspaces */
width = (width / puzzle->columns) & ~3;
height = (height / puzzle->rows) & ~3;
if (width == 0 || height == 0) {
gst_video_image_copy_area (&dest, 0, 0, &src, 0, 0,
gst_videofilter_get_input_width (videofilter),
gst_videofilter_get_input_height (videofilter));
return;
}
if (width * puzzle->columns != gst_videofilter_get_input_width (videofilter)) {
guint w =
gst_videofilter_get_input_width (videofilter) - width * puzzle->columns;
gst_video_image_copy_area (&dest, width * puzzle->columns, 0, &src,
width * puzzle->columns, 0, w,
gst_videofilter_get_input_height (videofilter));
}
if (height * puzzle->rows != gst_videofilter_get_input_height (videofilter)) {
guint h =
gst_videofilter_get_input_height (videofilter) - height * puzzle->rows;
gst_video_image_copy_area (&dest, 0, height * puzzle->rows, &src, 0,
height * puzzle->rows, gst_videofilter_get_input_width (videofilter),
h);
}
for (i = 0; i < puzzle->tiles; i++) {
if (!puzzle->solved && i == puzzle->position) {
gst_video_image_draw_rectangle (&dest, width * (i % puzzle->columns),
height * (i / puzzle->columns), width, height,
&GST_VIDEO_COLOR_WHITE, TRUE);
} else {
gst_video_image_copy_area (&dest, width * (i % puzzle->columns),
height * (i / puzzle->columns), &src,
width * (puzzle->permutation[i] % puzzle->columns),
height * (puzzle->permutation[i] / puzzle->columns), width, height);
}
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_library_load ("gstvideofilter"))
return FALSE;
return gst_element_register (plugin, "puzzle", GST_RANK_NONE,
GST_TYPE_PUZZLE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"games",
"a collection of games to showcase features",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)