///
/// Тоже, что и attr_int, только для чтения child_value()
/// В конфиге это выглядит как <param>1234<param>
///
int child_value_int(const pugi::xml_node &node, const char *text)
{
pugi::xml_node child_node = node.child(text);
if (!child_node)
{
snprintf(buf, MAX_STRING_LENGTH, "...%s read fail", text);
mudlog(buf, CMP, LVL_IMMORT, SYSLOG, TRUE);
}
return cast_to_int(child_node.child_value());
}
///
/// Обертка на pugixml для чтения числового аттрибута
/// с логирование в имм- и сислог
/// В конфиге это выглядит как <param value="1234" />
/// \return -1 в случае неудачи
int attr_int(const pugi::xml_node &node, const char *text)
{
pugi::xml_attribute attr = node.attribute(text);
if (!attr)
{
snprintf(buf, MAX_STRING_LENGTH, "...%s read fail", text);
mudlog(buf, CMP, LVL_IMMORT, SYSLOG, TRUE);
}
return cast_to_int(attr.value());
}
// The make_clist() method generates, for all destination samples,
// the list of all source samples with non-zero weighted contributions.
Resampler::Contrib_List* Resampler::make_clist(
int src_x, int dst_x, Boundary_Op boundary_op,
Resample_Real (*Pfilter)(Resample_Real),
Resample_Real filter_support,
Resample_Real filter_scale,
Resample_Real src_ofs)
{
typedef struct
{
// The center of the range in DISCRETE coordinates (pixel center = 0.0f).
Resample_Real center;
int left, right;
} Contrib_Bounds;
int i, j, k, n, left, right;
Resample_Real total_weight;
Resample_Real xscale, center, half_width, weight;
Contrib_List* Pcontrib;
Contrib* Pcpool;
Contrib* Pcpool_next;
Contrib_Bounds* Pcontrib_bounds;
if ((Pcontrib = (Contrib_List*)calloc(dst_x, sizeof(Contrib_List))) == NULL)
return NULL;
Pcontrib_bounds = (Contrib_Bounds*)calloc(dst_x, sizeof(Contrib_Bounds));
if (!Pcontrib_bounds)
{
free(Pcontrib);
return (NULL);
}
const Resample_Real oo_filter_scale = 1.0f / filter_scale;
const Resample_Real NUDGE = 0.5f;
xscale = dst_x / (Resample_Real)src_x;
if (xscale < 1.0f)
{
int total; (void)total;
/* Handle case when there are fewer destination
* samples than source samples (downsampling/minification).
*/
// stretched half width of filter
half_width = (filter_support / xscale) * filter_scale;
// Find the range of source sample(s) that will contribute to each destination sample.
for (i = 0, n = 0; i < dst_x; i++)
{
// Convert from discrete to continuous coordinates, scale, then convert back to discrete.
center = ((Resample_Real)i + NUDGE) / xscale;
center -= NUDGE;
center += src_ofs;
left = cast_to_int((Resample_Real)floor(center - half_width));
right = cast_to_int((Resample_Real)ceil(center + half_width));
Pcontrib_bounds[i].center = center;
Pcontrib_bounds[i].left = left;
Pcontrib_bounds[i].right = right;
n += (right - left + 1);
}
/* Allocate memory for contributors. */
if ((n == 0) || ((Pcpool = (Contrib*)calloc(n, sizeof(Contrib))) == NULL))
{
free(Pcontrib);
free(Pcontrib_bounds);
return NULL;
}
total = n;
Pcpool_next = Pcpool;
/* Create the list of source samples which
* contribute to each destination sample.
*/
for (i = 0; i < dst_x; i++)
{
int max_k = -1;
Resample_Real max_w = -1e+20f;
center = Pcontrib_bounds[i].center;
left = Pcontrib_bounds[i].left;
right = Pcontrib_bounds[i].right;
Pcontrib[i].n = 0;
Pcontrib[i].p = Pcpool_next;
Pcpool_next += (right - left + 1);
resampler_assert ((Pcpool_next - Pcpool) <= total);
total_weight = 0;
for (j = left; j <= right; j++)
total_weight += (*Pfilter)((center - (Resample_Real)j) * xscale * oo_filter_scale);
const Resample_Real norm = static_cast<Resample_Real>(1.0f / total_weight);
total_weight = 0;
#if RESAMPLER_DEBUG
printf("%i: ", i);
#endif
for (j = left; j <= right; j++)
{
weight = (*Pfilter)((center - (Resample_Real)j) * xscale * oo_filter_scale) * norm;
if (weight == 0.0f)
continue;
n = reflect(j, src_x, boundary_op);
#if RESAMPLER_DEBUG
printf("%i(%f), ", n, weight);
#endif
/* Increment the number of source
* samples which contribute to the
* current destination sample.
*/
k = Pcontrib[i].n++;
Pcontrib[i].p[k].pixel = (unsigned short)(n); /* store src sample number */
Pcontrib[i].p[k].weight = weight; /* store src sample weight */
total_weight += weight; /* total weight of all contributors */
if (weight > max_w)
{
max_w = weight;
max_k = k;
}
}
#if RESAMPLER_DEBUG
printf("\n\n");
#endif
//resampler_assert(Pcontrib[i].n);
//resampler_assert(max_k != -1);
if ((max_k == -1) || (Pcontrib[i].n == 0))
{
free(Pcpool);
free(Pcontrib);
free(Pcontrib_bounds);
return NULL;
}
if (total_weight != 1.0f)
Pcontrib[i].p[max_k].weight += 1.0f - total_weight;
}
}
else
{
/* Handle case when there are more
* destination samples than source
* samples (upsampling).
*/
half_width = filter_support * filter_scale;
// Find the source sample(s) that contribute to each destination sample.
for (i = 0, n = 0; i < dst_x; i++)
{
// Convert from discrete to continuous coordinates, scale, then convert back to discrete.
center = ((Resample_Real)i + NUDGE) / xscale;
center -= NUDGE;
center += src_ofs;
left = cast_to_int((Resample_Real)floor(center - half_width));
right = cast_to_int((Resample_Real)ceil(center + half_width));
Pcontrib_bounds[i].center = center;
Pcontrib_bounds[i].left = left;
Pcontrib_bounds[i].right = right;
n += (right - left + 1);
}
/* Allocate memory for contributors. */
int total = n;
if ((total == 0) || ((Pcpool = (Contrib*)calloc(total, sizeof(Contrib))) == NULL))
{
free(Pcontrib);
free(Pcontrib_bounds);
return NULL;
}
Pcpool_next = Pcpool;
/* Create the list of source samples which
* contribute to each destination sample.
*/
for (i = 0; i < dst_x; i++)
{
int max_k = -1;
Resample_Real max_w = -1e+20f;
center = Pcontrib_bounds[i].center;
left = Pcontrib_bounds[i].left;
right = Pcontrib_bounds[i].right;
Pcontrib[i].n = 0;
Pcontrib[i].p = Pcpool_next;
Pcpool_next += (right - left + 1);
resampler_assert((Pcpool_next - Pcpool) <= total);
total_weight = 0;
for (j = left; j <= right; j++)
total_weight += (*Pfilter)((center - (Resample_Real)j) * oo_filter_scale);
const Resample_Real norm = static_cast<Resample_Real>(1.0f / total_weight);
total_weight = 0;
#if RESAMPLER_DEBUG
printf("%i: ", i);
#endif
for (j = left; j <= right; j++)
{
weight = (*Pfilter)((center - (Resample_Real)j) * oo_filter_scale) * norm;
if (weight == 0.0f)
continue;
n = reflect(j, src_x, boundary_op);
#if RESAMPLER_DEBUG
printf("%i(%f), ", n, weight);
#endif
/* Increment the number of source
* samples which contribute to the
* current destination sample.
*/
k = Pcontrib[i].n++;
Pcontrib[i].p[k].pixel = (unsigned short)(n); /* store src sample number */
Pcontrib[i].p[k].weight = weight; /* store src sample weight */
total_weight += weight; /* total weight of all contributors */
if (weight > max_w)
{
max_w = weight;
max_k = k;
}
}
#if RESAMPLER_DEBUG
printf("\n\n");
#endif
//resampler_assert(Pcontrib[i].n);
//resampler_assert(max_k != -1);
if ((max_k == -1) || (Pcontrib[i].n == 0))
{
free(Pcpool);
free(Pcontrib);
free(Pcontrib_bounds);
return NULL;
}
if (total_weight != 1.0f)
Pcontrib[i].p[max_k].weight += 1.0f - total_weight;
}
}
#if RESAMPLER_DEBUG
printf("*******\n");
#endif
free(Pcontrib_bounds);
return Pcontrib;
}