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gst/videofilter/gstgamma.c: Adds gamma correction for RGB, with separate r g and b correction factors.

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Original commit message from CVS:
reviewed by: David Schleef  <ds@schleef.org>
* gst/videofilter/gstgamma.c: (gst_gamma_class_init),
(gst_gamma_init), (gst_gamma_set_property),
(gst_gamma_get_property), (gst_gamma_calculate_tables),
(gst_gamma_rgb24), (gst_gamma_rgb32):  Adds gamma correction
for RGB, with separate r g and b correction factors.
This commit is contained in:
David Schleef 2004-02-24 21:23:40 +00:00
parent 0448bb4c30
commit 5f6624172b
2 changed files with 147 additions and 6 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2004-02-24 Arwed v. Merkatz <v.merkatz@gmx.net>
reviewed by: David Schleef <ds@schleef.org>
* gst/videofilter/gstgamma.c: (gst_gamma_class_init),
(gst_gamma_init), (gst_gamma_set_property),
(gst_gamma_get_property), (gst_gamma_calculate_tables),
(gst_gamma_rgb24), (gst_gamma_rgb32): Adds gamma correction
for RGB, with separate r g and b correction factors.
2004-02-24 Thomas Vander Stichele <thomas at apestaart dot org>
* ext/vorbis/vorbisdec.c: (vorbis_dec_chain):

143
gst/videofilter/gstgamma.c
View file

@ -53,7 +53,11 @@ struct _GstGamma {
GstVideofilter videofilter;
double gamma;
double gamma_r, gamma_g, gamma_b;
guint8 gamma_table[256];
guint8 gamma_table_r[256];
guint8 gamma_table_g[256];
guint8 gamma_table_b[256];
};
struct _GstGammaClass {
@ -70,6 +74,9 @@ enum {
enum {
ARG_0,
ARG_GAMMA,
ARG_GAMMA_R,
ARG_GAMMA_G,
ARG_GAMMA_B,
/* FILL ME */
};
@ -81,8 +88,10 @@ static void gst_gamma_set_property (GObject *object, guint prop_id, const GValu
static void gst_gamma_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_gamma_planar411(GstVideofilter *videofilter, void *dest, void *src);
static void gst_gamma_rgb24(GstVideofilter *videofilter, void *dest, void *src);
static void gst_gamma_rgb32(GstVideofilter *videofilter, void *dest, void *src);
static void gst_gamma_setup(GstVideofilter *videofilter);
static void gst_gamma_calculate_table (GstGamma *gamma);
static void gst_gamma_calculate_tables (GstGamma *gamma);
GType
gst_gamma_get_type (void)
@ -109,6 +118,8 @@ gst_gamma_get_type (void)
static GstVideofilterFormat gst_gamma_formats[] = {
{ "I420", 12, gst_gamma_planar411, },
{ "RGB ", 24, gst_gamma_rgb24, 24, G_BIG_ENDIAN, 0xff0000, 0xff00, 0xff },
{ "RGB ", 32, gst_gamma_rgb32, 24, G_BIG_ENDIAN, 0x00ff00, 0xff0000, 0xff000000 },
};
@ -147,6 +158,15 @@ gst_gamma_class_init (gpointer g_class, gpointer class_data)
g_object_class_install_property(gobject_class, ARG_GAMMA,
g_param_spec_double("gamma", "Gamma", "gamma",
0.01, 10, 1, G_PARAM_READWRITE));
g_object_class_install_property(gobject_class, ARG_GAMMA_R,
g_param_spec_double("redgamma", "Gamma_r", "gamma value for the red channel",
0.01, 10, 1, G_PARAM_READWRITE));
g_object_class_install_property(gobject_class, ARG_GAMMA_G,
g_param_spec_double("greengamma", "Gamma_g", "gamma value for the green channel",
0.01, 10, 1, G_PARAM_READWRITE));
g_object_class_install_property(gobject_class, ARG_GAMMA_B,
g_param_spec_double("bluegamma", "Gamma_b", "gamma value for the blue channel",
0.01, 10, 1, G_PARAM_READWRITE));
gobject_class->set_property = gst_gamma_set_property;
gobject_class->get_property = gst_gamma_get_property;
@ -166,7 +186,10 @@ gst_gamma_init (GTypeInstance *instance, gpointer g_class)
/* do stuff */
gamma->gamma = 1;
gst_gamma_calculate_table (gamma);
gamma->gamma_r = 1;
gamma->gamma_g = 1;
gamma->gamma_b = 1;
gst_gamma_calculate_tables (gamma);
}
static void
@ -182,7 +205,19 @@ gst_gamma_set_property (GObject *object, guint prop_id, const GValue *value, GPa
switch (prop_id) {
case ARG_GAMMA:
gamma->gamma = g_value_get_double (value);
gst_gamma_calculate_table (gamma);
gst_gamma_calculate_tables (gamma);
break;
case ARG_GAMMA_R:
gamma->gamma_r = g_value_get_double (value);
gst_gamma_calculate_tables (gamma);
break;
case ARG_GAMMA_G:
gamma->gamma_g = g_value_get_double (value);
gst_gamma_calculate_tables (gamma);
break;
case ARG_GAMMA_B:
gamma->gamma_b = g_value_get_double (value);
gst_gamma_calculate_tables (gamma);
break;
default:
break;
@ -201,7 +236,15 @@ gst_gamma_get_property (GObject *object, guint prop_id, GValue *value, GParamSpe
switch (prop_id) {
case ARG_GAMMA:
g_value_set_double (value, gamma->gamma);
gst_gamma_calculate_table (gamma);
break;
case ARG_GAMMA_R:
g_value_set_double (value, gamma->gamma_r);
break;
case ARG_GAMMA_G:
g_value_set_double (value, gamma->gamma_g);
break;
case ARG_GAMMA_B:
g_value_set_double (value, gamma->gamma_b);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@ -243,13 +286,16 @@ static void gst_gamma_setup(GstVideofilter *videofilter)
}
static void
gst_gamma_calculate_table (GstGamma *gamma)
gst_gamma_calculate_tables (GstGamma *gamma)
{
int n;
double val;
double exp;
if (gamma->gamma == 1.0) {
if (gamma->gamma == 1.0 &&
gamma->gamma_r == 1.0 &&
gamma->gamma_g == 1.0 &&
gamma->gamma_b == 1.0) {
GST_VIDEOFILTER (gamma)->passthru = TRUE;
return;
}
@ -262,6 +308,27 @@ gst_gamma_calculate_table (GstGamma *gamma)
val = 255.0 * val;
gamma->gamma_table[n] = (unsigned char) floor(val + 0.5);
}
exp = 1.0 / gamma->gamma_r;
for (n = 0; n < 256; n++) {
val = n/255.0;
val = pow(val, exp);
val = 255.0 * val;
gamma->gamma_table_r[n] = (unsigned char) floor(val + 0.5);
}
exp = 1.0 / gamma->gamma_g;
for (n = 0; n < 256; n++) {
val = n/255.0;
val = pow(val, exp);
val = 255.0 * val;
gamma->gamma_table_g[n] = (unsigned char) floor(val + 0.5);
}
exp = 1.0 / gamma->gamma_b;
for (n = 0; n < 256; n++) {
val = n/255.0;
val = pow(val, exp);
val = 255.0 * val;
gamma->gamma_table_b[n] = (unsigned char) floor(val + 0.5);
}
}
@ -291,3 +358,67 @@ static void gst_gamma_planar411(GstVideofilter *videofilter,
}
}
static void gst_gamma_rgb24(GstVideofilter *videofilter, void *dest, void *src)
{
GstGamma *gamma;
int i;
int width, height;
guint8 *csrc = src;
guint8 *cdest = dest;
g_return_if_fail(GST_IS_GAMMA(videofilter));
gamma = GST_GAMMA(videofilter);
width = gst_videofilter_get_input_width(videofilter);
height = gst_videofilter_get_input_height(videofilter);
if (gamma->gamma == 1.0) {
i = 0;
while ( i < width * height * 3) {
*cdest++ = gamma->gamma_table_r[*csrc++];
*cdest++ = gamma->gamma_table_g[*csrc++];
*cdest++ = gamma->gamma_table_b[*csrc++];
i = i + 3;
}
} else {
i = 0;
while (i < width * height * 3) {
*cdest++ = gamma->gamma_table[*csrc++];
i++;
}
}
}
static void gst_gamma_rgb32(GstVideofilter *videofilter, void *dest, void *src)
{
GstGamma *gamma;
int i;
int width, height;
guint8 *csrc = src;
guint8 *cdest = dest;
g_return_if_fail(GST_IS_GAMMA(videofilter));
gamma = GST_GAMMA(videofilter);
width = gst_videofilter_get_input_width(videofilter);
height = gst_videofilter_get_input_height(videofilter);
if (gamma->gamma == 1.0) {
i = 0;
while ( i < width * height * 4) {
*cdest++ = gamma->gamma_table_b[*csrc++];
*cdest++ = gamma->gamma_table_g[*csrc++];
*cdest++ = gamma->gamma_table_r[*csrc++];
*cdest++; *csrc++;
i = i + 4;
}
} else {
i = 0;
while (i < width * height * 4) {
if ((i % 4) != 3)
*cdest++ = gamma->gamma_table[*csrc++];
else {
*cdest++; *csrc++;
}
i++;
}
}
}