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/*
Copyright (C) 2009-2015 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include "utils.h"
int rgb32_data_has_alpha(int width, int height, size_t stride,
uint8_t *data, int *all_set_out)
{
uint32_t *line, *end, alpha;
int has_alpha;
has_alpha = FALSE;
while (height-- > 0) {
line = (uint32_t *)data;
end = line + width;
data += stride;
while (line != end) {
alpha = *line & 0xff000000U;
if (alpha != 0) {
has_alpha = TRUE;
if (alpha != 0xff000000U) {
*all_set_out = FALSE;
return TRUE;
}
}
line++;
}
}
*all_set_out = has_alpha;
return has_alpha;
}
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