cairo_surface_t *
_cairo_image_surface_scale (cairo_surface_t *image,
int scaled_width,
int scaled_height,
scale_filter_t filter,
GthAsyncTask *task)
{
int src_width;
int src_height;
cairo_surface_t *scaled;
cairo_surface_metadata_t *metadata;
resize_filter_t *resize_filter;
ScaleReal x_factor;
ScaleReal y_factor;
cairo_surface_t *tmp;
src_width = cairo_image_surface_get_width (image);
src_height = cairo_image_surface_get_height (image);
if ((src_width == scaled_width) && (src_height == scaled_height))
return _cairo_image_surface_copy (image);
scaled = _cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
scaled_width,
scaled_height);
_cairo_image_surface_copy_metadata (image, scaled);
metadata = _cairo_image_surface_get_metadata (scaled);
if (metadata->original_width <= 0) {
metadata->original_width = src_width;
metadata->original_height = src_height;
}
if (scaled == NULL)
return NULL;
if (g_once_init_enter (&coefficients_initialization)) {
initialize_coefficients (1.0, 0.0);
g_once_init_leave (&coefficients_initialization, 1);
}
resize_filter = resize_filter_create (task);
resize_filter_set_type (resize_filter, filter);
resize_filter->total_lines = scaled_width + scaled_height;
resize_filter->processed_lines = 0;
x_factor = (ScaleReal) scaled_width / src_width;
y_factor = (ScaleReal) scaled_height / src_height;
tmp = _cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
src_height,
scaled_width);
horizontal_scale_transpose (image, tmp, x_factor, resize_filter);
horizontal_scale_transpose (tmp, scaled, y_factor, resize_filter);
resize_filter_destroy (resize_filter);
cairo_surface_destroy (tmp);
return scaled;
}
bool ranking_synthesis_satt::generate_functions(void)
{
exprt templ = instantiate();
if(body.variable_map.size()==0 || templ.is_false())
return false;
// some coefficient values
c_valuest c_values;
debug("Template:" + from_expr(ns, "", templ));
satcheckt::resultt result=satcheckt::P_SATISFIABLE;
while(result==satcheckt::P_SATISFIABLE)
{
if(c_values.size()==0)
initialize_coefficients(c_values);
else
{
if(increase_coefficients(c_values))
break;
}
result=check_for_counterexample(templ, c_values,
conversion_time, solver_time);
}
if(result==satcheckt::P_ERROR)
throw ("Solver error.");
else if(result==satcheckt::P_UNSATISFIABLE) // no counter-example
{
debug("Found ranking functions");
// put the coefficient values in the rank relation
replace_mapt replace_map;
for(c_valuest::const_iterator it=c_values.begin();
it!=c_values.end();
it++)
{
replace_map[it->first] = from_integer(it->second, it->first.type());
}
replace_expr(replace_map, rank_relation);
simplify(rank_relation, ns);
return true;
}
else
return false;
}