void
image_chroma_optimize(IMAGE * img, int width, int height, int edged_width)
{
int x,y;
int pixels = 0;
for (y = 1; y < height/2 - 1; y++)
for (x = 1; x < width/2 - 1; x++)
{
#define IS_PURE(a) ((a)<=16||(a)>=235)
#define IMG_Y(Y,X) img->y[(Y)*edged_width + (X)]
#define IMG_U(Y,X) img->u[(Y)*edged_width/2 + (X)]
#define IMG_V(Y,X) img->v[(Y)*edged_width/2 + (X)]
if (IS_PURE(IMG_Y(y*2 ,x*2 )) &&
IS_PURE(IMG_Y(y*2 ,x*2+1)) &&
IS_PURE(IMG_Y(y*2+1,x*2 )) &&
IS_PURE(IMG_Y(y*2+1,x*2+1)))
{
IMG_U(y,x) = (IMG_U(y,x-1) + IMG_U(y-1, x) + IMG_U(y, x+1) + IMG_U(y+1, x)) / 4;
IMG_V(y,x) = (IMG_V(y,x-1) + IMG_V(y-1, x) + IMG_V(y, x+1) + IMG_V(y+1, x)) / 4;
pixels++;
}
#undef IS_PURE
#undef IMG_Y
#undef IMG_U
#undef IMG_V
}
DPRINTF(H264_DEBUG_DEBUG,"chroma_optimized_pixels = %i/%i\n", pixels, width*height/4);
}
static void optimize(te_expr *n) {
/* Evaluates as much as possible. */
if (n->type == TE_CONSTANT) return;
if (n->type == TE_VARIABLE) return;
/* Only optimize out functions flagged as pure. */
if (IS_PURE(n->type)) {
const int arity = ARITY(n->type);
int known = 1;
int i;
for (i = 0; i < arity; ++i) {
optimize(n->parameters[i]);
if (((te_expr*)(n->parameters[i]))->type != TE_CONSTANT) {
known = 0;
}
}
if (known) {
const double value = te_eval(n);
te_free_parameters(n);
n->type = TE_CONSTANT;
n->value = value;
}
}
}
