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Java example source code file (img_fscolor.h)
The img_fscolor.h Java example source code/* * 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 a Floyd-Steinberg error diffusion technique * to produce a very high quality version of an image with only an 8-bit * (or less) RGB colormap. The error diffusion technique requires that * the input color information be delivered in a special order from the * top row to the bottom row and then left to right within each row, thus * it is only valid in cases where the ImageProducer has specified the * TopDownLeftRight delivery hint. If the data is not read in that order, * no mathematical or memory access errors should occur, but the dithering * error will be spread through the pixels of the output image in an * unpleasant manner. */ #include "img_fsutil.h" /* * These definitions vector the standard macro names to the "Color" * versions of those macros only if the "DitherDeclared" keyword has * not yet been defined elsewhere. The "DitherDeclared" keyword is * also defined here to claim ownership of the primary implementation * even though this file does not rely on the definitions in any other * files. */ #ifndef DitherDeclared #define DitherDeclared #define DeclareDitherVars DeclareColorDitherVars #define InitDither InitColorDither #define StartDitherLine StartColorDitherLine #define DitherPixel ColorDitherPixel #define DitherBufComplete ColorDitherBufComplete #endif typedef struct { int r, g, b; } ColorDitherError; #define DeclareColorDitherVars \ int er, eg, eb; \ ColorDitherError *cep; #define InitColorDither(cvdata, clrdata, dstTW) \ do { \ if (cvdata->fserrors == 0) { \ int size = (dstTW + 2) * sizeof(ColorDitherError); \ cep = (ColorDitherError *) sysMalloc(size); \ if (cep == 0) { \ SignalError(0, JAVAPKG "OutOfMemoryError", 0); \ return SCALEFAILURE; \ } \ memset(cep, 0, size); \ cvdata->fserrors = (void *) cep; \ } \ } while (0) #define StartColorDitherLine(cvdata, dstX1, dstY) \ do { \ cep = (ColorDitherError *) cvdata->fserrors; \ if (dstX1) { \ er = cep[0].r; \ eg = cep[0].g; \ eb = cep[0].b; \ cep += dstX1; \ } else { \ er = eg = eb = 0; \ } \ } while (0) #define ColorDitherPixel(dstX, dstY, pixel, red, green, blue) \ do { \ int e1, e2, e3; \ \ /* add previous errors */ \ red += cep[1].r; \ green += cep[1].g; \ blue += cep[1].b; \ \ /* bounds checking */ \ e1 = ComponentBound(red); \ e2 = ComponentBound(green); \ e3 = ComponentBound(blue); \ \ /* Store the closest color in the destination pixel */ \ pixel = ColorCubeFSMap(e1, e2, e3); \ GetPixelRGB(pixel, red, green, blue); \ \ /* Set the error from the previous lap */ \ cep[1].r = er; cep[1].g = eg; cep[1].b = eb; \ \ /* compute the errors */ \ er = e1 - red; eg = e2 - green; eb = e3 - blue; \ \ /* distribute the errors */ \ DitherDist(cep, e1, e2, e3, er, r); \ DitherDist(cep, e1, e2, e3, eg, g); \ DitherDist(cep, e1, e2, e3, eb, b); \ cep++; \ } while (0) #define ColorDitherBufComplete(cvdata, dstX1) \ do { \ if (dstX1) { \ cep = (ColorDitherError *) cvdata->fserrors; \ cep[0].r = er; \ cep[0].g = eg; \ cep[0].b = eb; \ } \ } while (0) Other Java examples (source code examples)Here is a short list of links related to this Java img_fscolor.h source code file: |
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