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alpha: Do not override the method with custom r/g/b values

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Depending on the order g_object_set() calls aare made, the
target r/g/b settings will override the method if set to
green/blue. Change that so we do not use the target-r/g/b values
unless the method is set to custom.

https://bugzilla.gnome.org/show_bug.cgi?id=694374
This commit is contained in:
Youness Alaoui 2013-02-21 15:01:15 -05:00 committed by Tim-Philipp Müller
parent 42d8b96f2d
commit a65fd146f8
1 changed files with 25 additions and 23 deletions
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48
gst/alpha/gstalpha.c
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@ -327,20 +327,6 @@ gst_alpha_set_property (GObject * object, guint prop_id,
&& (alpha->prefer_passthrough);
alpha->method = method;
switch (alpha->method) {
case ALPHA_METHOD_GREEN:
alpha->target_r = 0;
alpha->target_g = 255;
alpha->target_b = 0;
break;
case ALPHA_METHOD_BLUE:
alpha->target_r = 0;
alpha->target_g = 0;
alpha->target_b = 255;
break;
default:
break;
}
gst_alpha_set_process_function (alpha);
gst_alpha_init_params (alpha);
break;
@ -2300,8 +2286,26 @@ gst_alpha_init_params_full (GstAlpha * alpha,
gfloat tmp;
gfloat tmp1, tmp2;
gfloat y;
guint target_r = alpha->target_r;
guint target_g = alpha->target_g;
guint target_b = alpha->target_b;
const gint *matrix;
switch (alpha->method) {
case ALPHA_METHOD_GREEN:
target_r = 0;
target_g = 255;
target_b = 0;
break;
case ALPHA_METHOD_BLUE:
target_r = 0;
target_g = 0;
target_b = 255;
break;
default:
break;
}
/* RGB->RGB: convert to SDTV YUV, chroma keying, convert back
* YUV->RGB: chroma keying, convert to RGB
* RGB->YUV: convert to YUV, chroma keying
@ -2325,20 +2329,18 @@ gst_alpha_init_params_full (GstAlpha * alpha,
(alpha->out_sdtv) ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
cog_rgb_to_ycbcr_matrix_8bit_hdtv;
y = (matrix[0] * ((gint) alpha->target_r) +
matrix[1] * ((gint) alpha->target_g) +
matrix[2] * ((gint) alpha->target_b) + matrix[3]) >> 8;
y = (matrix[0] * ((gint) target_r) +
matrix[1] * ((gint) target_g) +
matrix[2] * ((gint) target_b) + matrix[3]) >> 8;
/* Cb,Cr without offset here because the chroma keying
* works with them being in range [-128,127]
*/
tmp1 =
(matrix[4] * ((gint) alpha->target_r) +
matrix[5] * ((gint) alpha->target_g) +
matrix[6] * ((gint) alpha->target_b)) >> 8;
(matrix[4] * ((gint) target_r) +
matrix[5] * ((gint) target_g) + matrix[6] * ((gint) target_b)) >> 8;
tmp2 =
(matrix[8] * ((gint) alpha->target_r) +
matrix[9] * ((gint) alpha->target_g) +
matrix[10] * ((gint) alpha->target_b)) >> 8;
(matrix[8] * ((gint) target_r) +
matrix[9] * ((gint) target_g) + matrix[10] * ((gint) target_b)) >> 8;
kgl = sqrt (tmp1 * tmp1 + tmp2 * tmp2);
alpha->cb = 127 * (tmp1 / kgl);