1/*
2 * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26/*
27 * This file contains macro definitions for the Decoding category of
28 * the macros used by the generic scaleloop function.
29 *
30 * This implementation can decode the pixel information associated
31 * with any Java IndexColorModel object.  This implementation examines
32 * some of the private fields of the IndexColorModel object and decodes
33 * the red, green, blue, and possibly alpha values directly rather than
34 * calling the getRGB method on the Java object.
35 */
36
37/*
38 * These definitions vector the standard macro names to the "ICM"
39 * versions of those macros only if the "DecodeDeclared" keyword has
40 * not yet been defined elsewhere.  The "DecodeDeclared" keyword is
41 * also defined here to claim ownership of the primary implementation
42 * even though this file does not rely on the definitions in any other
43 * files.
44 */
45#ifndef DecodeDeclared
46#define DeclareDecodeVars       DeclareICMVars
47#define InitPixelDecode(CM)     InitPixelICM(unhand(CM))
48#define PixelDecode             PixelICMDecode
49#define DecodeDeclared
50#endif
51
52#include "java_awt_image_IndexColorModel.h"
53
54#define DeclareICMVars                                  \
55    unsigned int mapsize;                               \
56    unsigned int *cmrgb;
57
58#define InitPixelICM(CM)                                        \
59    do {                                                        \
60        Classjava_awt_image_IndexColorModel *icm =              \
61            (Classjava_awt_image_IndexColorModel *) CM;         \
62        cmrgb = (unsigned int *) unhand(icm->rgb);              \
63        mapsize = obj_length(icm->rgb);                         \
64    } while (0)
65
66#define PixelICMDecode(CM, pixel, red, green, blue, alpha)      \
67    do {                                                        \
68        VerifyPixelRange(pixel, mapsize);                       \
69        pixel = cmrgb[pixel];                                   \
70        IfAlpha(alpha = (pixel >> ALPHASHIFT) & 0xff;)          \
71        red = (pixel >> REDSHIFT) & 0xff;                       \
72        green = (pixel >> GREENSHIFT) & 0xff;                   \
73        blue = (pixel >> BLUESHIFT) & 0xff;                     \
74    } while (0)
75