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 

    36 typedef jushort UshortGrayPixelType;

    37 typedef 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 */