1/*
2 * Copyright (c) 2000, 2008, 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#ifndef UshortGray_h_Included
27#define UshortGray_h_Included
28
29#include "IntDcm.h"
30
31/*
32 * This file contains macro and type definitions used by the macros in
33 * LoopMacros.h to manipulate a surface of type "UshortGray".
34 */
35
36typedef jushort UshortGrayPixelType;
37typedef jushort UshortGrayDataType;
38
39#define UshortGrayIsOpaque 1
40
41#define UshortGrayPixelStride 2
42#define UshortGrayBitsPerPixel 16
43
44#define DeclareUshortGrayLoadVars(PREFIX)
45#define DeclareUshortGrayStoreVars(PREFIX)
46#define SetUshortGrayStoreVarsYPos(PREFIX, pRasInfo, y)
47#define SetUshortGrayStoreVarsXPos(PREFIX, pRasInfo, x)
48#define InitUshortGrayLoadVars(PREFIX, pRasInfo)
49#define InitUshortGrayStoreVarsY(PREFIX, pRasInfo)
50#define InitUshortGrayStoreVarsX(PREFIX, pRasInfo)
51#define NextUshortGrayStoreVarsX(PREFIX)
52#define NextUshortGrayStoreVarsY(PREFIX)
53#define DeclareUshortGrayPixelData(PREFIX)
54#define ExtractUshortGrayPixelData(PIXEL, PREFIX)
55
56#define UshortGrayXparLutEntry -1
57#define UshortGrayIsXparLutEntry(pix) (pix < 0)
58#define StoreUshortGrayNonXparFromArgb StoreUshortGrayFrom1IntArgb
59
60
61/*
62 * Note: The following (original) equation was incorrect:
63 * gray = (((19595*r) + (38470*g) + (7471*b) + 32768) / 65536);
64 *
65 * The new component coefficients were derived from the following equation:
66 * k*rf*255 + k*gf*255 + k*bf*255 = 2^24 - 1
67 *
68 * The new calculated coefficients are:
69 * rf = 19672
70 * gf = 38620
71 * bf = 7500
72 *
73 * Thus the new equation would be:
74 * gray = (((19672*r) + (38620*g) + (7500*b) + 128) / 255)
75 * but it has been tweaked so the faster "divide by 256" can be performed and
76 * the "add 128" can be removed. Therefore, the resultant formula is optimal:
77 * gray = (((19672*r) + (38621*g) + (7500*b)) / 256)
78 */
79#define ComposeUshortGrayFrom3ByteRgb(r, g, b) \
80 (UshortGrayPixelType)(((19672*(r)) + (38621*(g)) + (7500*(b))) / 256)
81
82#define UshortGrayPixelFromArgb(pixel, rgb, pRasInfo) \
83 do { \
84 int r, g, b; \
85 ExtractIntDcmComponentsX123(rgb, r, g, b); \
86 (pixel) = ComposeUshortGrayFrom3ByteRgb(r, g, b); \
87 } while (0)
88
89#define StoreUshortGrayPixel(pRas, x, pixel) \
90 ((pRas)[x] = (jushort) (pixel))
91
92#define StoreUshortGrayPixelData(pPix, x, pixel, PREFIX) \
93 StoreUshortGrayPixel(pPix, x, pixel)
94
95
96#define LoadUshortGrayTo1IntRgb(pRas, PREFIX, x, rgb) \
97 do { \
98 int gray = (pRas)[x] >> 8; \
99 (rgb) = (((gray << 8) | gray) << 8) | gray; \
100 } while (0)
101
102#define LoadUshortGrayTo1IntArgb(pRas, PREFIX, x, argb) \
103 do { \
104 int gray = (pRas)[x] >> 8; \
105 (argb) = (((((0xff << 8) | gray) << 8) | gray) << 8) | gray; \
106 } while (0)
107
108#define LoadUshortGrayTo3ByteRgb(pRas, PREFIX, x, r, g, b) \
109 ((r) = (g) = (b) = ((pRas)[x] >> 8))
110
111#define LoadUshortGrayTo4ByteArgb(pRas, PREFIX, x, a, r, g, b) \
112 do { \
113 LoadUshortGrayTo3ByteRgb(pRas, PREFIX, x, r, g, b); \
114 (a) = 0xff; \
115 } while (0)
116
117#define LoadUshortGrayTo1ByteGray(pRas, PREFIX, x, gray) \
118 (gray) = ((pRas)[x] >> 8)
119
120#define LoadUshortGrayTo1ShortGray(pRas, PREFIX, x, gray) \
121 (gray) = (pRas)[x]
122
123#define StoreUshortGrayFrom1IntRgb(pRas, PREFIX, x, rgb) \
124 do { \
125 int r, g, b; \
126 ExtractIntDcmComponentsX123(rgb, r, g, b); \
127 StoreUshortGrayFrom3ByteRgb(pRas, PREFIX, x, r, g, b); \
128 } while (0)
129
130#define StoreUshortGrayFrom1IntArgb(pRas, PREFIX, x, argb) \
131 StoreUshortGrayFrom1IntRgb(pRas, PREFIX, x, argb)
132
133#define StoreUshortGrayFrom3ByteRgb(pRas, PREFIX, x, r, g, b) \
134 (pRas)[x] = ComposeUshortGrayFrom3ByteRgb(r, g, b)
135
136#define StoreUshortGrayFrom4ByteArgb(pRas, PREFIX, x, a, r, g, b) \
137 StoreUshortGrayFrom3ByteRgb(pRas, PREFIX, x, r, g, b)
138
139#define StoreUshortGrayFrom1ByteGray(pRas, PREFIX, x, gray) \
140 (pRas)[x] = (jushort) (((gray) << 8) + (gray))
141
142#define StoreUshortGrayFrom1ShortGray(pRas, PREFIX, x, gray) \
143 StoreUshortGrayPixel(pRas, x, gray)
144
145
146#define DeclareUshortGrayAlphaLoadData(PREFIX)
147#define InitUshortGrayAlphaLoadData(PREFIX, pRasInfo)
148
149#define LoadAlphaFromUshortGrayFor1ShortGray(pRas, PREFIX, COMP_PREFIX) \
150 COMP_PREFIX ## A = 0xffff
151
152#define Postload1ShortGrayFromUshortGray(pRas, PREFIX, COMP_PREFIX) \
153 COMP_PREFIX ## G = (pRas)[0]
154
155
156#define UshortGrayIsPremultiplied 0
157
158#define DeclareUshortGrayBlendFillVars(PREFIX) \
159 jushort PREFIX;
160
161#define ClearUshortGrayBlendFillVars(PREFIX, argb) \
162 PREFIX = 0
163
164#define InitUshortGrayBlendFillVarsNonPre(PREFIX, argb, COMP_PREFIX) \
165 PREFIX = (jushort) COMP_PREFIX ## G
166
167#define InitUshortGrayBlendFillVarsPre(PREFIX, argb, COMP_PREFIX)
168
169#define StoreUshortGrayBlendFill(pRas, PREFIX, x, argb, COMP_PREFIX) \
170 (pRas)[x] = PREFIX
171
172#define StoreUshortGrayFrom1ShortGrayComps(pRas, PREFIX, x, COMP_PREFIX) \
173 StoreUshortGrayPixel(pRas, x, COMP_PREFIX ## G)
174
175#endif /* UshortGray_h_Included */
176