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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_BASEGFX_TOOLS_GRADIENTTOOLS_HXX
      21             : #define INCLUDED_BASEGFX_TOOLS_GRADIENTTOOLS_HXX
      22             : 
      23             : #include <basegfx/point/b2dpoint.hxx>
      24             : #include <basegfx/range/b2drange.hxx>
      25             : #include <basegfx/vector/b2dvector.hxx>
      26             : #include <basegfx/matrix/b2dhommatrix.hxx>
      27             : #include <basegfx/numeric/ftools.hxx>
      28             : #include <basegfx/basegfxdllapi.h>
      29             : 
      30             : #include <vector>
      31             : #include <algorithm>
      32             : 
      33             : namespace basegfx
      34             : {
      35             :     /** Gradient definition as used in ODF 1.2
      36             : 
      37             :         This struct collects all data necessary for rendering ODF
      38             :         1.2-compatible gradients. Use the createXXXODFGradientInfo()
      39             :         methods below for initializing from ODF attributes.
      40             :      */
      41           0 :     class BASEGFX_DLLPUBLIC ODFGradientInfo
      42             :     {
      43             :     private:
      44             :         /** transformation mapping from [0,1]^2 texture coordinate
      45             :            space to [0,1]^2 shape coordinate space
      46             :          */
      47             :         B2DHomMatrix    maTextureTransform;
      48             : 
      49             :         /** transformation mapping from [0,1]^2 shape coordinate space
      50             :            to [0,1]^2 texture coordinate space. This is the
      51             :            transformation commonly used to create gradients from a
      52             :            scanline rasterizer (put shape u/v coordinates into it, get
      53             :            texture s/t coordinates out of it)
      54             :          */
      55             :         B2DHomMatrix    maBackTextureTransform;
      56             : 
      57             :         /** Aspect ratio of the gradient. Only used in drawinglayer
      58             :            for generating nested gradient polygons currently. Already
      59             :            catered for in the transformations above.
      60             :          */
      61             :         double          mfAspectRatio;
      62             : 
      63             :         /** Requested gradient steps to render. See the
      64             :            implementations of the getXXXGradientAlpha() methods below,
      65             :            the semantic differs slightly for the different gradient
      66             :            types.
      67             :          */
      68             :         sal_uInt32      mnSteps;
      69             : 
      70             :     public:
      71           0 :         ODFGradientInfo()
      72             :         :   maTextureTransform(),
      73             :             maBackTextureTransform(),
      74             :             mfAspectRatio(1.0),
      75           0 :             mnSteps(0)
      76             :         {
      77           0 :         }
      78             : 
      79           0 :         ODFGradientInfo(
      80             :             const B2DHomMatrix& rTextureTransform,
      81             :             double fAspectRatio,
      82             :             sal_uInt32 nSteps)
      83             :         :   maTextureTransform(rTextureTransform),
      84             :             maBackTextureTransform(),
      85             :             mfAspectRatio(fAspectRatio),
      86           0 :             mnSteps(nSteps)
      87             :         {
      88           0 :         }
      89             : 
      90             :         ODFGradientInfo(const ODFGradientInfo& rODFGradientInfo)
      91             :         :   maTextureTransform(rODFGradientInfo.getTextureTransform()),
      92             :             maBackTextureTransform(rODFGradientInfo.maBackTextureTransform),
      93             :             mfAspectRatio(rODFGradientInfo.getAspectRatio()),
      94             :             mnSteps(rODFGradientInfo.getSteps())
      95             :         {
      96             :         }
      97             : 
      98           0 :         ODFGradientInfo& operator=(const ODFGradientInfo& rODFGradientInfo)
      99             :         {
     100           0 :             maTextureTransform = rODFGradientInfo.getTextureTransform();
     101           0 :             maBackTextureTransform = rODFGradientInfo.maBackTextureTransform;
     102           0 :             mfAspectRatio = rODFGradientInfo.getAspectRatio();
     103           0 :             mnSteps = rODFGradientInfo.getSteps();
     104             : 
     105           0 :             return *this;
     106             :         }
     107             : 
     108             :         // compare operator
     109             :         bool operator==(const ODFGradientInfo& rGeoTexSvx) const;
     110             : 
     111           0 :         const B2DHomMatrix& getTextureTransform() const { return maTextureTransform; }
     112             :         const B2DHomMatrix& getBackTextureTransform() const;
     113           0 :         double getAspectRatio() const { return mfAspectRatio; }
     114           0 :         sal_uInt32 getSteps() const { return mnSteps; }
     115             : 
     116           0 :         void setTextureTransform(const B2DHomMatrix& rNew)
     117             :         {
     118           0 :             maTextureTransform = rNew;
     119           0 :             maBackTextureTransform.identity();
     120           0 :         }
     121             :     };
     122             : 
     123             :     namespace tools
     124             :     {
     125             :         /** Create matrix for ODF's linear gradient definition
     126             : 
     127             :             Note that odf linear gradients are varying in y direction.
     128             : 
     129             :             @param o_rGradientInfo
     130             :             Receives the calculated texture transformation matrix (for
     131             :             use with standard [0,1]x[0,1] texture coordinates)
     132             : 
     133             :             @param rTargetArea
     134             :             Output area, needed for aspect ratio calculations and
     135             :             texture transformation
     136             : 
     137             :             @param nSteps
     138             :             Number of gradient steps (from ODF)
     139             : 
     140             :             @param fBorder
     141             :             Width of gradient border (from ODF)
     142             : 
     143             :             @param fAngle
     144             :             Gradient angle (from ODF)
     145             :          */
     146             :         BASEGFX_DLLPUBLIC ODFGradientInfo createLinearODFGradientInfo(
     147             :             const B2DRange& rTargetArea,
     148             :             sal_uInt32 nSteps,
     149             :             double fBorder,
     150             :             double fAngle);
     151             : 
     152             : 
     153             :         /** Calculate linear gradient blend value
     154             : 
     155             :             This method generates you the lerp alpha value for
     156             :             blending linearly between gradient start and end color,
     157             :             according to the formula (startCol*(1.0-alpha) + endCol*alpha)
     158             : 
     159             :             @param rUV
     160             :             Current uv coordinate. Values outside [0,1] will be
     161             :             clamped. Assumes gradient color varies along the y axis.
     162             : 
     163             :             @param rGradInfo
     164             :             Gradient info, for transformation and number of steps
     165             :          */
     166             :         BASEGFX_DLLPUBLIC double getLinearGradientAlpha(const B2DPoint& rUV,
     167             :             const ODFGradientInfo& rGradInfo);
     168             : 
     169             :         /** Create matrix for ODF's axial gradient definition
     170             : 
     171             :             Note that odf axial gradients are varying in y
     172             :             direction. Note further that you can map the axial
     173             :             gradient to a linear gradient (in case you want or need to
     174             :             avoid an extra gradient renderer), by using
     175             :             createLinearODFGradientInfo() instead, shifting the
     176             :             resulting texture transformation by 0.5 to the top and
     177             :             appending the same stop colors again, but mirrored.
     178             : 
     179             :             @param o_rGradientInfo
     180             :             Receives the calculated texture transformation matrix (for
     181             :             use with standard [0,1]x[0,1] texture coordinates)
     182             : 
     183             :             @param rTargetArea
     184             :             Output area, needed for aspect ratio calculations and
     185             :             texture transformation
     186             : 
     187             :             @param nSteps
     188             :             Number of gradient steps (from ODF)
     189             : 
     190             :             @param fBorder
     191             :             Width of gradient border (from ODF)
     192             : 
     193             :             @param fAngle
     194             :             Gradient angle (from ODF)
     195             :          */
     196             :         BASEGFX_DLLPUBLIC ODFGradientInfo createAxialODFGradientInfo(
     197             :             const B2DRange& rTargetArea,
     198             :             sal_uInt32 nSteps,
     199             :             double fBorder,
     200             :             double fAngle);
     201             : 
     202             : 
     203             :         /** Calculate axial gradient blend value
     204             : 
     205             :             This method generates you the lerp alpha value for
     206             :             blending linearly between gradient start and end color,
     207             :             according to the formula (startCol*(1.0-alpha) + endCol*alpha)
     208             : 
     209             :             @param rUV
     210             :             Current uv coordinate. Values outside [0,1] will be
     211             :             clamped. Assumes gradient color varies along the y axis.
     212             : 
     213             :             @param rGradInfo
     214             :             Gradient info, for transformation and number of steps
     215             :          */
     216             :         BASEGFX_DLLPUBLIC double getAxialGradientAlpha(const B2DPoint& rUV,
     217             :             const ODFGradientInfo& rGradInfo);
     218             : 
     219             :         /** Create matrix for ODF's radial gradient definition
     220             : 
     221             :             @param o_rGradientInfo
     222             :             Receives the calculated texture transformation matrix (for
     223             :             use with standard [0,1]x[0,1] texture coordinates)
     224             : 
     225             :             @param rTargetArea
     226             :             Output area, needed for aspect ratio calculations and
     227             :             texture transformation
     228             : 
     229             :             @param rOffset
     230             :             Gradient offset value (from ODF)
     231             : 
     232             :             @param nSteps
     233             :             Number of gradient steps (from ODF)
     234             : 
     235             :             @param fBorder
     236             :             Width of gradient border (from ODF)
     237             : 
     238             :             @param fAngle
     239             :             Gradient angle (from ODF)
     240             :          */
     241             :         BASEGFX_DLLPUBLIC ODFGradientInfo createRadialODFGradientInfo(
     242             :             const B2DRange& rTargetArea,
     243             :             const B2DVector& rOffset,
     244             :             sal_uInt32 nSteps,
     245             :             double fBorder);
     246             : 
     247             : 
     248             :         /** Calculate radial gradient blend value
     249             : 
     250             :             This method generates you the lerp alpha value for
     251             :             blending linearly between gradient start and end color,
     252             :             according to the formula (startCol*(1.0-alpha) + endCol*alpha)
     253             : 
     254             :             @param rUV
     255             :             Current uv coordinate. Values outside [0,1] will be
     256             :             clamped.
     257             : 
     258             :             @param rGradInfo
     259             :             Gradient info, for transformation and number of steps
     260             :          */
     261             :         BASEGFX_DLLPUBLIC double getRadialGradientAlpha(const B2DPoint& rUV,
     262             :             const ODFGradientInfo& rGradInfo);
     263             : 
     264             :         /** Create matrix for ODF's elliptical gradient definition
     265             : 
     266             :             @param o_rGradientInfo
     267             :             Receives the calculated texture transformation matrix (for
     268             :             use with standard [0,1]x[0,1] texture coordinates)
     269             : 
     270             :             @param rTargetArea
     271             :             Output area, needed for aspect ratio calculations and
     272             :             texture transformation
     273             : 
     274             :             @param rOffset
     275             :             Gradient offset value (from ODF)
     276             : 
     277             :             @param nSteps
     278             :             Number of gradient steps (from ODF)
     279             : 
     280             :             @param fBorder
     281             :             Width of gradient border (from ODF)
     282             : 
     283             :             @param fAngle
     284             :             Gradient angle (from ODF)
     285             :          */
     286             :         BASEGFX_DLLPUBLIC ODFGradientInfo createEllipticalODFGradientInfo(
     287             :             const B2DRange& rTargetArea,
     288             :             const B2DVector& rOffset,
     289             :             sal_uInt32 nSteps,
     290             :             double fBorder,
     291             :             double fAngle);
     292             : 
     293             : 
     294             :         /** Calculate elliptical gradient blend value
     295             : 
     296             :             This method generates you the lerp alpha value for
     297             :             blending linearly between gradient start and end color,
     298             :             according to the formula (startCol*(1.0-alpha) + endCol*alpha)
     299             : 
     300             :             @param rUV
     301             :             Current uv coordinate. Values outside [0,1] will be
     302             :             clamped.
     303             : 
     304             :             @param rGradInfo
     305             :             Gradient info, for transformation and number of steps
     306             :          */
     307             :         BASEGFX_DLLPUBLIC double getEllipticalGradientAlpha(const B2DPoint& rUV,
     308             :             const ODFGradientInfo& rGradInfo);
     309             : 
     310             :         /** Create matrix for ODF's square gradient definition
     311             : 
     312             :             @param o_rGradientInfo
     313             :             Receives the calculated texture transformation matrix (for
     314             :             use with standard [0,1]x[0,1] texture coordinates)
     315             : 
     316             :             @param rTargetArea
     317             :             Output area, needed for aspect ratio calculations and
     318             :             texture transformation
     319             : 
     320             :             @param rOffset
     321             :             Gradient offset value (from ODF)
     322             : 
     323             :             @param nSteps
     324             :             Number of gradient steps (from ODF)
     325             : 
     326             :             @param fBorder
     327             :             Width of gradient border (from ODF)
     328             : 
     329             :             @param fAngle
     330             :             Gradient angle (from ODF)
     331             :          */
     332             :         BASEGFX_DLLPUBLIC ODFGradientInfo createSquareODFGradientInfo(
     333             :             const B2DRange& rTargetArea,
     334             :             const B2DVector& rOffset,
     335             :             sal_uInt32 nSteps,
     336             :             double fBorder,
     337             :             double fAngle);
     338             : 
     339             : 
     340             :         /** Calculate square gradient blend value
     341             : 
     342             :             This method generates you the lerp alpha value for
     343             :             blending linearly between gradient start and end color,
     344             :             according to the formula (startCol*(1.0-alpha) + endCol*alpha)
     345             : 
     346             :             @param rUV
     347             :             Current uv coordinate. Values outside [0,1] will be
     348             :             clamped.
     349             : 
     350             :             @param rGradInfo
     351             :             Gradient info, for transformation and number of steps
     352             :          */
     353             :         BASEGFX_DLLPUBLIC double getSquareGradientAlpha(const B2DPoint& rUV,
     354             :             const ODFGradientInfo& rGradInfo);
     355             : 
     356             :         /** Create matrix for ODF's rectangular gradient definition
     357             : 
     358             :             @param o_rGradientInfo
     359             :             Receives the calculated texture transformation matrix (for
     360             :             use with standard [0,1]x[0,1] texture coordinates)
     361             : 
     362             :             @param rTargetArea
     363             :             Output area, needed for aspect ratio calculations and
     364             :             texture transformation
     365             : 
     366             :             @param rOffset
     367             :             Gradient offset value (from ODF)
     368             : 
     369             :             @param nSteps
     370             :             Number of gradient steps (from ODF)
     371             : 
     372             :             @param fBorder
     373             :             Width of gradient border (from ODF)
     374             : 
     375             :             @param fAngle
     376             :             Gradient angle (from ODF)
     377             :          */
     378             :         BASEGFX_DLLPUBLIC ODFGradientInfo createRectangularODFGradientInfo(
     379             :             const B2DRange& rTargetArea,
     380             :             const B2DVector& rOffset,
     381             :             sal_uInt32 nSteps,
     382             :             double fBorder,
     383             :             double fAngle);
     384             : 
     385             : 
     386             :         /** Calculate rectangular gradient blend value
     387             : 
     388             :             This method generates you the lerp alpha value for
     389             :             blending linearly between gradient start and end color,
     390             :             according to the formula (startCol*(1.0-alpha) + endCol*alpha)
     391             : 
     392             :             @param rUV
     393             :             Current uv coordinate. Values outside [0,1] will be
     394             :             clamped.
     395             : 
     396             :             @param rGradInfo
     397             :             Gradient info, for transformation and number of steps
     398             :          */
     399             :         BASEGFX_DLLPUBLIC double getRectangularGradientAlpha(const B2DPoint& rUV,
     400             :             const ODFGradientInfo& rGradInfo);
     401             :     }
     402             : }
     403             : 
     404             : #endif
     405             : 
     406             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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