| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 DirectColorModel object. This implemenation will |
| 32 | * scale the decoded color components to 8-bit quantities if needed. |
| 33 | * Another file is provided to optimize DCM parsing when the masks |
| 34 | * are guaranteed to be at least 8-bits wide. This implementation |
| 35 | * examines some of the private fields of the DirectColorModel |
| 36 | * object and decodes the red, green, blue, and possibly alpha values |
| 37 | * directly rather than calling the getRGB method on the Java object. |
| 38 | */ |
| 39 | |
| 40 | /* |
| 41 | * These definitions vector the standard macro names to the "DCM" |
| 42 | * versions of those macros only if the "DecodeDeclared" keyword has |
| 43 | * not yet been defined elsewhere. The "DecodeDeclared" keyword is |
| 44 | * also defined here to claim ownership of the primary implementation |
| 45 | * even though this file does not rely on the definitions in any other |
| 46 | * files. |
| 47 | */ |
| 48 | #ifndef DecodeDeclared |
| 49 | #define DeclareDecodeVars DeclareDCMVars |
| 50 | #define InitPixelDecode(CM) InitPixelDCM(unhand(CM)) |
| 51 | #define PixelDecode PixelDCMDecode |
| 52 | #define DecodeDeclared |
| 53 | #endif |
| 54 | |
| 55 | #include "java_awt_image_DirectColorModel.h" |
| 56 | |
| 57 | #define DeclareDCMVars \ |
| 58 | IfAlpha(int alpha_mask; \ |
| 59 | int alpha_scale; \ |
| 60 | unsigned int alpha_off;) \ |
| 61 | int red_mask, green_mask, blue_mask; \ |
| 62 | int red_scale, green_scale, blue_scale; \ |
| 63 | unsigned int red_off, green_off, blue_off; \ |
| 64 | int scale; |
| 65 | |
| 66 | #define InitPixelDCM(CM) \ |
| 67 | do { \ |
| 68 | Classjava_awt_image_DirectColorModel *dcm = \ |
| 69 | (Classjava_awt_image_DirectColorModel *) CM; \ |
| 70 | red_mask = dcm->red_mask; \ |
| 71 | red_off = dcm->red_offset; \ |
| 72 | red_scale = dcm->red_scale; \ |
| 73 | green_mask = dcm->green_mask; \ |
| 74 | green_off = dcm->green_offset; \ |
| 75 | green_scale = dcm->green_scale; \ |
| 76 | blue_mask = dcm->blue_mask; \ |
| 77 | blue_off = dcm->blue_offset; \ |
| 78 | blue_scale = dcm->blue_scale; \ |
| 79 | IfAlpha(alpha_mask = dcm->alpha_mask; \ |
| 80 | alpha_off = dcm->alpha_offset; \ |
| 81 | alpha_scale = dcm->alpha_scale;) \ |
| 82 | scale = (red_scale | green_scale | blue_scale \ |
| 83 | IfAlpha(| alpha_scale)); \ |
| 84 | } while (0) |
| 85 | |
| 86 | #define PixelDCMDecode(CM, pixel, red, green, blue, alpha) \ |
| 87 | do { \ |
| 88 | IfAlpha(alpha = ((alpha_mask == 0) \ |
| 89 | ? 255 \ |
| 90 | : ((pixel & alpha_mask) >> alpha_off));) \ |
| 91 | red = ((pixel & red_mask) >> red_off); \ |
| 92 | green = ((pixel & green_mask) >> green_off); \ |
| 93 | blue = ((pixel & blue_mask) >> blue_off); \ |
| 94 | if (scale) { \ |
| 95 | if (red_scale) { \ |
| 96 | red = red * 255 / (red_scale); \ |
| 97 | } \ |
| 98 | if (green_scale) { \ |
| 99 | green = green * 255 / (green_scale); \ |
| 100 | } \ |
| 101 | if (blue_scale) { \ |
| 102 | blue = blue * 255 / (blue_scale); \ |
| 103 | } \ |
| 104 | IfAlpha(if (alpha_scale) { \ |
| 105 | alpha = alpha * 255 / (alpha_scale); \ |
| 106 | }) \ |
| 107 | } \ |
| 108 | } while (0) |