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/* Pango
* pango-coverage.c: Coverage maps for fonts
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:coverage-maps
* @short_description:Unicode character range coverage storage
* @title:Coverage Maps
*
* It is often necessary in Pango to determine if a particular font can
* represent a particular character, and also how well it can represent
* that character. The #PangoCoverage is a data structure that is used
* to represent that information.
*/
#include "config.h"
#include <string.h>
#include "pango-coverage.h"
struct _PangoCoverage
{
guint ref_count;
hb_set_t *chars;
};
/**
* pango_coverage_new:
*
* Create a new #PangoCoverage
*
* Return value: the newly allocated #PangoCoverage,
* initialized to %PANGO_COVERAGE_NONE
* with a reference count of one, which
* should be freed with pango_coverage_unref().
**/
PangoCoverage *
pango_coverage_new (void)
{
PangoCoverage *coverage = g_slice_new (PangoCoverage);
coverage->ref_count = 1;
coverage->chars = hb_set_create ();
return coverage;
}
/**
* pango_coverage_copy:
* @coverage: a #PangoCoverage
*
* Copy an existing #PangoCoverage. (This function may now be unnecessary
* since we refcount the structure. File a bug if you use it.)
*
* Return value: (transfer full): the newly allocated #PangoCoverage,
* with a reference count of one, which should be freed
* with pango_coverage_unref().
**/
PangoCoverage *
pango_coverage_copy (PangoCoverage *coverage)
{
PangoCoverage *copy;
g_return_val_if_fail (coverage != NULL, NULL);
copy = g_slice_new (PangoCoverage);
copy->ref_count = 1;
copy->chars = hb_set_reference (coverage->chars);
return copy;
}
/**
* pango_coverage_ref:
* @coverage: a #PangoCoverage
*
* Increase the reference count on the #PangoCoverage by one
*
* Return value: @coverage
**/
PangoCoverage *
pango_coverage_ref (PangoCoverage *coverage)
{
g_return_val_if_fail (coverage != NULL, NULL);
g_atomic_int_inc ((int *) &coverage->ref_count);
return coverage;
}
/**
* pango_coverage_unref:
* @coverage: a #PangoCoverage
*
* Decrease the reference count on the #PangoCoverage by one.
* If the result is zero, free the coverage and all associated memory.
**/
void
pango_coverage_unref (PangoCoverage *coverage)
{
g_return_if_fail (coverage != NULL);
g_return_if_fail (coverage->ref_count > 0);
if (g_atomic_int_dec_and_test ((int *) &coverage->ref_count))
{
hb_set_destroy (coverage->chars);
g_slice_free (PangoCoverage, coverage);
}
}
/**
* pango_coverage_get:
* @coverage: a #PangoCoverage
* @index_: the index to check
*
* Determine whether a particular index is covered by @coverage
*
* Return value: the coverage level of @coverage for character @index_.
**/
PangoCoverageLevel
pango_coverage_get (PangoCoverage *coverage,
int index)
{
if (hb_set_has (coverage->chars, (hb_codepoint_t)index))
return PANGO_COVERAGE_EXACT;
return PANGO_COVERAGE_NONE;
}
/**
* pango_coverage_set:
* @coverage: a #PangoCoverage
* @index_: the index to modify
* @level: the new level for @index_
*
* Modify a particular index within @coverage
**/
void
pango_coverage_set (PangoCoverage *coverage,
int index,
PangoCoverageLevel level)
{
if (level != PANGO_COVERAGE_NONE)
hb_set_add (coverage->chars, (hb_codepoint_t)index);
else
hb_set_del (coverage->chars, (hb_codepoint_t)index);
}
/**
* pango_coverage_max:
* @coverage: a #PangoCoverage
* @other: another #PangoCoverage
*
* Set the coverage for each index in @coverage to be the max (better)
* value of the current coverage for the index and the coverage for
* the corresponding index in @other.
*
* Deprecated: 1.44: This function does nothing
**/
void
pango_coverage_max (PangoCoverage *coverage,
PangoCoverage *other)
{
}
/**
* pango_coverage_to_bytes:
* @coverage: a #PangoCoverage
* @bytes: (out) (array length=n_bytes) (element-type guint8):
* location to store result (must be freed with g_free())
* @n_bytes: (out): location to store size of result
*
* Convert a #PangoCoverage structure into a flat binary format
*
* Deprecated: 1.44: This returns %NULL
**/
void
pango_coverage_to_bytes (PangoCoverage *coverage,
guchar **bytes,
int *n_bytes)
{
*bytes = NULL;
*n_bytes = 0;
}
/**
* pango_coverage_from_bytes:
* @bytes: (array length=n_bytes) (element-type guint8): binary data
* representing a #PangoCoverage
* @n_bytes: the size of @bytes in bytes
*
* Convert data generated from pango_coverage_to_bytes() back
* to a #PangoCoverage
*
* Return value: (transfer full) (nullable): a newly allocated
* #PangoCoverage, or %NULL if the data was invalid.
*
* Deprecated: 1.44: This returns %NULL
**/
PangoCoverage *
pango_coverage_from_bytes (guchar *bytes,
int n_bytes)
{
return NULL;
}
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