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This is a simple patch to change the alpha blending code in bmovl to use

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integers instead of floating point. It speeds it up by about 400%
meaning that it's now possible to apply alpha blending to a whole
1024x768 image on my 1266MHz PIII.
Jonas Jensen <jbj@knef.dk>


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9111 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
arpi 2003-01-26 17:42:24 +00:00
parent a7e9bac132
commit 8755d76ce2
1 changed files with 12 additions and 3 deletions
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15
libmpcodecs/vf_bmovl.c
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@ -395,11 +395,20 @@ put_image(struct vf_instance_s* vf, mp_image_t* mpi){
dmpi->planes[2][pos] = vf->priv->bitmap.v[pos];
}
} else { // Alphablended pixel
dmpi->planes[0][pos] = (dmpi->planes[0][pos]*(1.0-(alpha/255.0))) + (vf->priv->bitmap.y[pos]*(alpha/255.0));
dmpi->planes[0][pos] =
((255 - alpha) * (int)dmpi->planes[0][pos] +
alpha * (int)vf->priv->bitmap.y[pos]) >> 8;
if ((ypos%2) && (xpos%2)) {
pos = ( (ypos/2) * dmpi->stride[1] ) + (xpos/2);
dmpi->planes[1][pos] = (dmpi->planes[1][pos]*(1.0-(alpha/255.0))) + (vf->priv->bitmap.u[pos]*(alpha/255.0));
dmpi->planes[2][pos] = (dmpi->planes[2][pos]*(1.0-(alpha/255.0))) + (vf->priv->bitmap.v[pos]*(alpha/255.0));
dmpi->planes[1][pos] =
((255 - alpha) * (int)dmpi->planes[1][pos] +
alpha * (int)vf->priv->bitmap.u[pos]) >> 8;
dmpi->planes[2][pos] =
((255 - alpha) * (int)dmpi->planes[2][pos] +
alpha * (int)vf->priv->bitmap.v[pos]) >> 8;
}
}
} // for xpos