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alpha: Remove remaining floating point arithmetic when processing a pixel

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This commit is contained in:
Sebastian Dröge 2010-03-18 19:00:09 +01:00
parent f7ba12513e
commit dad4e96672
2 changed files with 10 additions and 5 deletions
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14
gst/alpha/gstalpha.c
View file

@ -462,7 +462,7 @@ static inline gint
chroma_keying_yuv (gint a, gint * y, guint ny, gint * u,
gint * v, gint cr, gint cb, gint smin, gint smax, guint8 accept_angle_tg,
guint8 accept_angle_ctg, guint8 one_over_kc, guint8 kfgy_scale, gint8 kg,
gfloat noise_level)
guint noise_level2)
{
gint tmp, tmp1;
gint x1, y1;
@ -530,7 +530,7 @@ chroma_keying_yuv (gint a, gint * y, guint ny, gint * u,
tmp = z * z + (x - kg) * (x - kg);
tmp = MIN (tmp, 0xffff);
if (tmp < noise_level * noise_level)
if (tmp < noise_level2)
b_alpha = 0;
return b_alpha;
@ -545,6 +545,7 @@ gst_alpha_chroma_key_ayuv (guint8 * src, guint8 * dest, gint width, gint height,
gint i, j;
gint a, y, u, v;
gint smin, smax;
gint pa = alpha->alpha * 255;
smin = 128 - alpha->black_sensitivity;
smax = 128 + alpha->white_sensitivity;
@ -554,14 +555,15 @@ gst_alpha_chroma_key_ayuv (guint8 * src, guint8 * dest, gint width, gint height,
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
a = *src1++ * (alpha->alpha);
a = (*src1++ * pa) >> 8;
y = *src1++;
u = *src1++ - 128;
v = *src1++ - 128;
a = chroma_keying_yuv (a, &y, 1, &u, &v, alpha->cr, alpha->cb,
smin, smax, alpha->accept_angle_tg, alpha->accept_angle_ctg,
alpha->one_over_kc, alpha->kfgy_scale, alpha->kg, alpha->noise_level);
alpha->one_over_kc, alpha->kfgy_scale, alpha->kg,
alpha->noise_level2);
u += 128;
v += 128;
@ -596,7 +598,7 @@ gst_alpha_chromakey_row_i420 (GstAlpha * alpha, guint8 * dest1, guint8 * dest2,
a2 = chroma_keying_yuv (a, y, 4, &u, &v, alpha->cr, alpha->cb, smin,
smax, alpha->accept_angle_tg, alpha->accept_angle_ctg,
alpha->one_over_kc, alpha->kfgy_scale, alpha->kg, alpha->noise_level);
alpha->one_over_kc, alpha->kfgy_scale, alpha->kg, alpha->noise_level2);
u += 128;
v += 128;
@ -699,6 +701,8 @@ gst_alpha_init_params (GstAlpha * alpha)
tmp = MIN (tmp, 255);
alpha->kfgy_scale = tmp;
alpha->kg = MIN (kgl, 127);
alpha->noise_level2 = alpha->noise_level * alpha->noise_level;
}
static gboolean

1
gst/alpha/gstalpha.h
View file

@ -74,6 +74,7 @@ struct _GstAlpha
gfloat angle;
gfloat noise_level;
guint noise_level2;
guint black_sensitivity;
guint white_sensitivity;