| /* |
| * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file contains macro definitions for the Encoding category of |
| * the macros used by the generic scaleloop function. |
| * |
| * This implementation uses an ordered dithering error matrix to |
| * produce a moderately high quality version of an image with only |
| * an 8-bit (or less) RGB colormap or an 8-bit grayramp. The ordered |
| * dithering technique does not rely on the order in which the pixels |
| * are processed so this file can be used in cases where the ImageProducer |
| * has not specified the TopDownLeftRight delivery hint. The ordered |
| * dither technique is also much faster than the Floyd-Steinberg error |
| * diffusion algorithm so this implementation would also be appropriate |
| * for cases where performance is critical such as the processing of a |
| * video stream. |
| * |
| * This file can be used to provide the default implementation of the |
| * Encoding macros for RGB colormapped or grayscale displays. |
| */ |
| |
| /* |
| * These definitions vector the standard macro names to the "Any" |
| * versions of those macros. The "DitherDeclared" keyword is also |
| * defined to indicate to the other include files that they are not |
| * defining the primary implementation. All other include files |
| * will check for the existance of the "DitherDeclared" keyword |
| * and define their implementations of the Encoding macros using |
| * more specific names without overriding the standard names. This |
| * is done so that the other files can be included later to reuse |
| * their implementations for the specific cases. |
| */ |
| #define DitherDeclared |
| #define DeclareDitherVars DeclareAnyDitherVars |
| #define InitDither InitAnyDither |
| #define StartDitherLine StartAnyDitherLine |
| #define DitherPixel AnyDitherPixel |
| #define DitherBufComplete AnyDitherBufComplete |
| |
| /* |
| * Include the specific implementation for grayscale displays. |
| * The implementor will have to include one of the color display |
| * implementations (img_ordclrsgn.h or img_ordclruns.h) manually. |
| */ |
| #include "img_ordgray.h" |
| |
| #define DeclareAnyDitherVars \ |
| int grayscale; \ |
| DeclareColorDitherVars \ |
| DeclareGrayDitherVars \ |
| int relx, rely; |
| |
| #define InitAnyDither(cvdata, clrdata, dstTW) \ |
| do { \ |
| if (grayscale = clrdata->grayscale) { \ |
| InitGrayDither(cvdata, clrdata, dstTW); \ |
| } else { \ |
| InitColorDither(cvdata, clrdata, dstTW); \ |
| } \ |
| } while (0) |
| |
| #define StartAnyDitherLine(cvdata, dstX1, dstY) \ |
| do { \ |
| if (grayscale) { \ |
| StartGrayDitherLine(cvdata, dstX1, dstY); \ |
| } else { \ |
| StartColorDitherLine(cvdata, dstX1, dstY); \ |
| } \ |
| } while (0) |
| |
| #define AnyDitherPixel(dstX, dstY, pixel, red, green, blue) \ |
| do { \ |
| if (grayscale) { \ |
| GrayDitherPixel(dstX, dstY, pixel, red, green, blue); \ |
| } else { \ |
| ColorDitherPixel(dstX, dstY, pixel, red, green, blue); \ |
| } \ |
| } while (0) |
| |
| #define AnyDitherBufComplete(cvdata, dstX1) \ |
| do { \ |
| if (grayscale) { \ |
| GrayDitherBufComplete(cvdata, dstX1); \ |
| } else { \ |
| ColorDitherBufComplete(cvdata, dstX1); \ |
| } \ |
| } while (0) |
