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https://gitlab.uni-freiburg.de/opensourcevdi/spice
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029b4beb73
Author: Marc-André Lureau <marcandre.lureau@gmail.com> Acked-by: Jonathon Jongsma <jjongsma@redhat.com>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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Copyright (C) 2009-2015 Red Hat, Inc.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <glib.h>
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#include "utils.h"
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int rgb32_data_has_alpha(int width, int height, size_t stride,
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uint8_t *data, int *all_set_out)
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{
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uint32_t *line, *end, alpha;
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int has_alpha;
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has_alpha = FALSE;
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while (height-- > 0) {
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line = (uint32_t *)data;
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end = line + width;
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data += stride;
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while (line != end) {
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alpha = *line & 0xff000000U;
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if (alpha != 0) {
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has_alpha = TRUE;
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if (alpha != 0xff000000U) {
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*all_set_out = FALSE;
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return TRUE;
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}
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}
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line++;
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}
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}
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*all_set_out = has_alpha;
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return has_alpha;
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}
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