/* * Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved. * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ /* * The FreeType Project LICENSE * ---------------------------- * 2006-Jan-27 * Copyright 1996-2002, 2006 by * David Turner, Robert Wilhelm, and Werner Lemberg * Introduction * ============ * The FreeType Project is distributed in several archive packages; * some of them may contain, in addition to the FreeType font engine, * various tools and contributions which rely on, or relate to, the * FreeType Project. * This license applies to all files found in such packages, and * which do not fall under their own explicit license. The license * affects thus the FreeType font engine, the test programs, * documentation and makefiles, at the very least. * This license was inspired by the BSD, Artistic, and IJG * (Independent JPEG Group) licenses, which all encourage inclusion * and use of free software in commercial and freeware products * alike. As a consequence, its main points are that: * o We don't promise that this software works. However, we will be * interested in any kind of bug reports. (`as is' distribution) * o You can use this software for whatever you want, in parts or * full form, without having to pay us. (`royalty-free' usage) * o You may not pretend that you wrote this software. If you use * it, or only parts of it, in a program, you must acknowledge * somewhere in your documentation that you have used the * FreeType code. (`credits') * We specifically permit and encourage the inclusion of this * software, with or without modifications, in commercial products. * We disclaim all warranties covering The FreeType Project and * assume no liability related to The FreeType Project. * Finally, many people asked us for a preferred form for a * credit/disclaimer to use in compliance with this license. We thus * encourage you to use the following text: * """ * Portions of this software are copyright � <year> The FreeType * Project (www.freetype.org). All rights reserved. * """ * Please replace <year> with the value from the FreeType version you * actually use. * Legal Terms * =========== * 0. Definitions * -------------- * Throughout this license, the terms `package', `FreeType Project', * and `FreeType archive' refer to the set of files originally * distributed by the authors (David Turner, Robert Wilhelm, and * Werner Lemberg) as the `FreeType Project', be they named as alpha, * beta or final release. * `You' refers to the licensee, or person using the project, where * `using' is a generic term including compiling the project's source * code as well as linking it to form a `program' or `executable'. * This program is referred to as `a program using the FreeType * engine'. * This license applies to all files distributed in the original * FreeType Project, including all source code, binaries and * documentation, unless otherwise stated in the file in its * original, unmodified form as distributed in the original archive. * If you are unsure whether or not a particular file is covered by * this license, you must contact us to verify this. * The FreeType Project is copyright (C) 1996-2000 by David Turner, * Robert Wilhelm, and Werner Lemberg. All rights reserved except as * specified below. * 1. No Warranty * -------------- * THE FREETYPE PROJECT IS PROVIDED `AS IS' WITHOUT WARRANTY OF ANY * KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE. IN NO EVENT WILL ANY OF THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY DAMAGES CAUSED BY THE USE OR THE INABILITY TO * USE, OF THE FREETYPE PROJECT. * 2. Redistribution * ----------------- * This license grants a worldwide, royalty-free, perpetual and * irrevocable right and license to use, execute, perform, compile, * display, copy, create derivative works of, distribute and * sublicense the FreeType Project (in both source and object code * forms) and derivative works thereof for any purpose; and to * authorize others to exercise some or all of the rights granted * herein, subject to the following conditions: * o Redistribution of source code must retain this license file * (`FTL.TXT') unaltered; any additions, deletions or changes to * the original files must be clearly indicated in accompanying * documentation. The copyright notices of the unaltered, * original files must be preserved in all copies of source * files. * o Redistribution in binary form must provide a disclaimer that * states that the software is based in part of the work of the * FreeType Team, in the distribution documentation. We also * encourage you to put an URL to the FreeType web page in your * documentation, though this isn't mandatory. * These conditions apply to any software derived from or based on * the FreeType Project, not just the unmodified files. If you use * our work, you must acknowledge us. However, no fee need be paid * to us. * 3. Advertising * -------------- * Neither the FreeType authors and contributors nor you shall use * the name of the other for commercial, advertising, or promotional * purposes without specific prior written permission. * We suggest, but do not require, that you use one or more of the * following phrases to refer to this software in your documentation * or advertising materials: `FreeType Project', `FreeType Engine', * `FreeType library', or `FreeType Distribution'. * As you have not signed this license, you are not required to * accept it. However, as the FreeType Project is copyrighted * material, only this license, or another one contracted with the * authors, grants you the right to use, distribute, and modify it. * Therefore, by using, distributing, or modifying the FreeType * Project, you indicate that you understand and accept all the terms * of this license. * 4. Contacts * ----------- * There are two mailing lists related to FreeType: * o [email protected] * Discusses general use and applications of FreeType, as well as * future and wanted additions to the library and distribution. * If you are looking for support, start in this list if you * haven't found anything to help you in the documentation. * o [email protected] * Discusses bugs, as well as engine internals, design issues, * specific licenses, porting, etc. * Our home page can be found at * http://www.freetype.org */ #include <setjmp.h> #include <limits.h> #include <memory.h> #include "tvgSwCommon.h" /************************************************************************/ /* Internal Class Implementation */ /************************************************************************/ constexpr auto PIXEL_BITS = …; //must be at least 6 bits! constexpr auto ONE_PIXEL = …; Area; struct Band { … }; struct Cell { … }; struct RleWorker { … }; static inline SwPoint UPSCALE(const SwPoint& pt) { … } static inline SwPoint TRUNC(const SwPoint& pt) { … } static inline SwCoord TRUNC(const SwCoord x) { … } static inline SwPoint SUBPIXELS(const SwPoint& pt) { … } static inline SwCoord SUBPIXELS(const SwCoord x) { … } /* * Approximate sqrt(x*x+y*y) using the `alpha max plus beta min' * algorithm. We use alpha = 1, beta = 3/8, giving us results with a * largest error less than 7% compared to the exact value. */ static inline SwCoord HYPOT(SwPoint pt) { … } static void _horizLine(RleWorker& rw, SwCoord x, SwCoord y, SwCoord area, SwCoord acount) { … } static void _sweep(RleWorker& rw) { … } static Cell* _findCell(RleWorker& rw) { … } static void _recordCell(RleWorker& rw) { … } static void _setCell(RleWorker& rw, SwPoint pos) { … } static void _startCell(RleWorker& rw, SwPoint pos) { … } static void _moveTo(RleWorker& rw, const SwPoint& to) { … } static void _lineTo(RleWorker& rw, const SwPoint& to) { … } static void _cubicTo(RleWorker& rw, const SwPoint& ctrl1, const SwPoint& ctrl2, const SwPoint& to) { … } static void _decomposeOutline(RleWorker& rw) { … } static int _genRle(RleWorker& rw) { … } static SwSpan* _intersectSpansRegion(const SwRleData *clip, const SwRleData *target, SwSpan *outSpans, uint32_t outSpansCnt) { … } static SwSpan* _intersectSpansRect(const SwBBox *bbox, const SwRleData *targetRle, SwSpan *outSpans, uint32_t outSpansCnt) { … } void _replaceClipSpan(SwRleData *rle, SwSpan* clippedSpans, uint32_t size) { … } /************************************************************************/ /* External Class Implementation */ /************************************************************************/ SwRleData* rleRender(SwRleData* rle, const SwOutline* outline, const SwBBox& renderRegion, bool antiAlias) { … } SwRleData* rleRender(const SwBBox* bbox) { … } void rleReset(SwRleData* rle) { … } void rleFree(SwRleData* rle) { … } void rleClipPath(SwRleData *rle, const SwRleData *clip) { … } void rleClipRect(SwRleData *rle, const SwBBox* clip) { … }
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