1 /*
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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
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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
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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