static fz_weights *
make_weights(fz_context *ctx, int src_w, float x, float dst_w, fz_scale_filter *filter, int vertical, int dst_w_int, int patch_l, int patch_r, int n, int flip)
{
fz_weights *weights;
float F, G;
float window;
int j;
if (dst_w < src_w)
{
/* Scaling down */
F = dst_w / src_w;
G = 1;
}
else
{
/* Scaling up */
F = 1;
G = src_w / dst_w;
}
window = filter->width / F;
DBUG(("make_weights src_w=%d x=%g dst_w=%g patch_l=%d patch_r=%d F=%g window=%g\n", src_w, x, dst_w, patch_l, patch_r, F, window));
weights = new_weights(ctx, filter, src_w, dst_w, patch_r-patch_l, n, flip, patch_l);
if (!weights)
return NULL;
for (j = patch_l; j < patch_r; j++)
{
/* find the position of the centre of dst[j] in src space */
float centre = (j - x + 0.5f)*src_w/dst_w - 0.5f;
int l, r;
l = ceilf(centre - window);
r = floorf(centre + window);
DBUG(("%d: centre=%g l=%d r=%d\n", j, centre, l, r));
init_weights(weights, j);
for (; l <= r; l++)
{
add_weight(weights, j, l, filter, x, F, G, src_w, dst_w);
}
check_weights(weights, j, dst_w_int, x, dst_w);
if (vertical)
{
reorder_weights(weights, j, src_w);
}
}
weights->count++; /* weights->count = dst_w_int now */
return weights;
}
static fz_weights *
make_weights(fz_context *ctx, int src_w, float x, float dst_w, fz_scale_filter *filter, int vertical, int dst_w_int, int patch_l, int patch_r, int n, int flip, fz_scale_cache *cache)
{
fz_weights *weights;
float F, G;
float window;
int j;
if (cache)
{
if (cache->src_w == src_w && cache->x == x && cache->dst_w == dst_w &&
cache->filter == filter && cache->vertical == vertical &&
cache->dst_w_int == dst_w_int &&
cache->patch_l == patch_l && cache->patch_r == patch_r &&
cache->n == n && cache->flip == flip)
{
return cache->weights;
}
cache->src_w = src_w;
cache->x = x;
cache->dst_w = dst_w;
cache->filter = filter;
cache->vertical = vertical;
cache->dst_w_int = dst_w_int;
cache->patch_l = patch_l;
cache->patch_r = patch_r;
cache->n = n;
cache->flip = flip;
fz_free(ctx, cache->weights);
cache->weights = NULL;
}
if (dst_w < src_w)
{
/* Scaling down */
F = dst_w / src_w;
G = 1;
}
else
{
/* Scaling up */
F = 1;
G = src_w / dst_w;
}
window = filter->width / F;
weights = new_weights(ctx, filter, src_w, dst_w, patch_r-patch_l, n, flip, patch_l);
if (!weights)
return NULL;
for (j = patch_l; j < patch_r; j++)
{
/* find the position of the centre of dst[j] in src space */
float centre = (j - x + 0.5f)*src_w/dst_w - 0.5f;
int l, r;
l = ceilf(centre - window);
r = floorf(centre + window);
init_weights(weights, j);
for (; l <= r; l++)
{
add_weight(weights, j, l, filter, x, F, G, src_w, dst_w);
}
check_weights(weights, j, dst_w_int, x, dst_w);
if (vertical)
{
reorder_weights(weights, j, src_w);
}
}
weights->count++; /* weights->count = dst_w_int now */
if (cache)
{
cache->weights = weights;
}
return weights;
}