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audiovisualizers: add some simple drawing helpers for reuse

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Add a (uninstalled) header with simple drawing macros
This commit is contained in:
Stefan Sauer 2011-11-23 08:40:49 +01:00
parent b9c9540735
commit e3d1a50c0d
3 changed files with 44 additions and 29 deletions
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2
gst/audiovisualizers/Makefile.am
View file

@ -17,7 +17,7 @@ libgstaudiovisualizers_la_LIBADD = \
libgstaudiovisualizers_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstaudiovisualizers_la_LIBTOOLFLAGS = --tag=disable-static
noinst_HEADERS = gstbaseaudiovisualizer.h \
noinst_HEADERS = gstbaseaudiovisualizer.h gstdrawhelpers.h \
gstspacescope.h gstspectrascope.h gstsynaescope.h gstwavescope.h
Android.mk: Makefile.am $(BUILT_SOURCES)

37
gst/audiovisualizers/gstdrawhelpers.h Normal file
View file

@ -0,0 +1,37 @@
/* GStreamer
* Copyright (C) <2011> Stefan Sauer <ensonic@users.sf.net>
*
* gstdrawhelpers.h: simple drawing helpers
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#define draw_dot(_vd, _x, _y, _st, _c) G_STMT_START { \
_vd[(_y * _st) + _x] = _c; \
} G_STMT_END
#define draw_line(_vd, _x1, _x2, _y1, _y2, _st, _c) G_STMT_START { \
guint _i, _j, _x, _y; \
gint _dx = _x2 - _x1, _dy = _y2 - _y1; \
gfloat _f; \
\
_j = abs (_dx) > abs (_dy) ? abs (_dx) : abs (_dy); \
for (_i = 0; _i < _j; _i++) { \
_f = (gfloat) _i / (gfloat) _j; \
_x = _x1 + _dx * _f; \
_y = _y1 + _dy * _f; \
draw_dot (_vd, _x, _y, _st, _c); \
} \
} G_STMT_END

34
gst/audiovisualizers/gstwavescope.c
View file

@ -184,15 +184,16 @@ gst_wave_scope_get_property (GObject * object, guint prop_id,
}
}
#include "gstdrawhelpers.h"
static void
render_dots (GstBaseAudioVisualizer * scope, guint32 * vdata, gint16 * adata,
guint num_samples)
{
gint channels = scope->channels;
guint i, c, s, x = 0, y, oy;
guint i, c, s, x, y, oy;
gfloat dx, dy;
guint w = scope->width;
guint off;
/* draw dots */
dx = (gfloat) w / (gfloat) num_samples;
@ -204,40 +205,17 @@ render_dots (GstBaseAudioVisualizer * scope, guint32 * vdata, gint16 * adata,
x = (guint) ((gfloat) i * dx);
y = (guint) (oy + (gfloat) adata[s] * dy);
s += channels;
off = (y * w) + x;
vdata[off] = 0x00FFFFFF;
draw_dot (vdata, x, y, w, 0x00FFFFFF);
}
}
}
static void
draw_line (guint32 * vdata, guint x1, guint x2, guint y1, guint y2, guint w)
{
guint i, j, x, y, off;
gint dx = x2 - x1;
gint dy = y2 - y1;
gfloat f;
if (abs (dx) > abs (dy)) {
j = abs (dx);
} else {
j = abs (dy);
}
for (i = 0; i < j; i++) {
f = (gfloat) i / (gfloat) j;
x = x1 + dx * f;
y = y1 + dy * f;
off = (y * w) + x;
vdata[off] = 0x00FFFFFF;
}
}
static void
render_lines (GstBaseAudioVisualizer * scope, guint32 * vdata, gint16 * adata,
guint num_samples)
{
gint channels = scope->channels;
guint i, c, s, x = 0, y, oy;
guint i, c, s, x, y, oy;
gfloat dx, dy;
guint w = scope->width;
gint x2, y2;
@ -254,7 +232,7 @@ render_lines (GstBaseAudioVisualizer * scope, guint32 * vdata, gint16 * adata,
x = (guint) ((gfloat) i * dx);
y = (guint) (oy + (gfloat) adata[s] * dy);
s += channels;
draw_line (vdata, x2, x, y2, y, w);
draw_line (vdata, x2, x, y2, y, w, 0x00FFFFFF);
x2 = x;
y2 = y;
}