1 /* 2 * Copyright (c) 1996, 2012, 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 Java DirectColorModel objects where the color masks are 32 * guaranteed to be at least 8-bits wide each. It is slightly more 33 * efficient then the generic DCM parsing code since it does not need 34 * to store or test component scaling values. 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 "DCM8" 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 DeclareDCM8Vars 50 #define InitPixelDecode(CM) InitPixelDCM8(unhand(CM)) 51 #define PixelDecode PixelDCM8Decode 52 #define DecodeDeclared 53 #endif 54 55 #define DeclareDCM8Vars \ 56 IfAlpha(unsigned int alpha_off;) \ 57 unsigned int red_off, green_off, blue_off; 58 59 #define InitPixelDCM8(CM) \ 60 do { \ 61 Classjava_awt_image_DirectColorModel *dcm = \ 62 (Classjava_awt_image_DirectColorModel *) CM; \ 63 red_off = dcm->red_offset; \ 64 green_off = dcm->green_offset; \ 65 blue_off = dcm->blue_offset; \ 66 IfAlpha(alpha_off = (dcm->alpha_mask == 0 \ 67 ? -1 \ 68 : dcm->alpha_offset);) \ 69 } while (0) 70 71 #define PixelDCM8Decode(CM, pixel, red, green, blue, alpha) \ 72 do { \ 73 IfAlpha(alpha = ((alpha_off < 0) \ 74 ? 255 \ 75 : (pixel >> alpha_off) & 0xff);) \ 76 red = (pixel >> red_off) & 0xff; \ 77 green = (pixel >> green_off) & 0xff; \ 78 blue = (pixel >> blue_off) & 0xff; \ 79 } while (0) 80