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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <vclhelpergradient.hxx>
#include <basegfx/range/b2drange.hxx>
#include <vcl/outdev.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/polygon/b2dpolypolygontools.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <drawinglayer/texture/texture.hxx>
//////////////////////////////////////////////////////////////////////////////
// support methods for vcl direct gradient renderering
namespace drawinglayer
{
namespace
{
sal_uInt32 impCalcGradientSteps(OutputDevice& rOutDev, sal_uInt32 nSteps, const basegfx::B2DRange& rRange, sal_uInt32 nMaxDist)
{
if(nSteps == 0L)
{
const Size aSize(rOutDev.LogicToPixel(Size(basegfx::fround(rRange.getWidth()), basegfx::fround(rRange.getHeight()))));
nSteps = (aSize.getWidth() + aSize.getHeight()) >> 3L;
}
if(nSteps < 2L)
{
nSteps = 2L;
}
if(nSteps > nMaxDist)
{
nSteps = nMaxDist;
}
return nSteps;
}
void impDrawGradientToOutDevSimple(
OutputDevice& rOutDev,
const basegfx::B2DPolyPolygon& rTargetForm,
const ::std::vector< basegfx::B2DHomMatrix >& rMatrices,
const ::std::vector< basegfx::BColor >& rColors,
const basegfx::B2DPolygon& rUnitPolygon)
{
rOutDev.SetLineColor();
for(sal_uInt32 a(0L); a < rColors.size(); a++)
{
// set correct color
const basegfx::BColor aFillColor(rColors[a]);
rOutDev.SetFillColor(Color(aFillColor));
if(a)
{
if(a - 1L < static_cast< sal_uInt32 >(rMatrices.size()))
{
basegfx::B2DPolygon aNewPoly(rUnitPolygon);
aNewPoly.transform(rMatrices[a - 1L]);
rOutDev.DrawPolygon(aNewPoly);
}
}
else
{
rOutDev.DrawPolyPolygon(rTargetForm);
}
}
}
void impDrawGradientToOutDevComplex(
OutputDevice& rOutDev,
const basegfx::B2DPolyPolygon& rTargetForm,
const ::std::vector< basegfx::B2DHomMatrix >& rMatrices,
const ::std::vector< basegfx::BColor >& rColors,
const basegfx::B2DPolygon& rUnitPolygon)
{
PolyPolygon aVclTargetForm(rTargetForm);
::std::vector< Polygon > aVclPolygons;
sal_uInt32 a;
// remember and set to XOR
rOutDev.SetLineColor();
rOutDev.Push(PUSH_RASTEROP);
rOutDev.SetRasterOp(ROP_XOR);
// draw gradient PolyPolygons
for(a = 0L; a < rMatrices.size(); a++)
{
// create polygon and remember
basegfx::B2DPolygon aNewPoly(rUnitPolygon);
aNewPoly.transform(rMatrices[a]);
aVclPolygons.push_back(Polygon(aNewPoly));
// set correct color
if(rColors.size() > a)
{
const basegfx::BColor aFillColor(rColors[a]);
rOutDev.SetFillColor(Color(aFillColor));
}
// create vcl PolyPolygon and draw it
if(a)
{
PolyPolygon aVclPolyPoly(aVclPolygons[a - 1L]);
aVclPolyPoly.Insert(aVclPolygons[a]);
rOutDev.DrawPolyPolygon(aVclPolyPoly);
}
else
{
PolyPolygon aVclPolyPoly(aVclTargetForm);
aVclPolyPoly.Insert(aVclPolygons[0L]);
rOutDev.DrawPolyPolygon(aVclPolyPoly);
}
}
// draw last poly in last color
if(!rColors.empty())
{
const basegfx::BColor aFillColor(rColors[rColors.size() - 1L]);
rOutDev.SetFillColor(Color(aFillColor));
rOutDev.DrawPolygon(aVclPolygons[aVclPolygons.size() - 1L]);
}
// draw object form in black and go back to XOR
rOutDev.SetFillColor(COL_BLACK);
rOutDev.SetRasterOp(ROP_0);
rOutDev.DrawPolyPolygon(aVclTargetForm);
rOutDev.SetRasterOp(ROP_XOR);
// draw gradient PolyPolygons again
for(a = 0L; a < rMatrices.size(); a++)
{
// set correct color
if(rColors.size() > a)
{
const basegfx::BColor aFillColor(rColors[a]);
rOutDev.SetFillColor(Color(aFillColor));
}
// create vcl PolyPolygon and draw it
if(a)
{
PolyPolygon aVclPolyPoly(aVclPolygons[a - 1L]);
aVclPolyPoly.Insert(aVclPolygons[a]);
rOutDev.DrawPolyPolygon(aVclPolyPoly);
}
else
{
PolyPolygon aVclPolyPoly(aVclTargetForm);
aVclPolyPoly.Insert(aVclPolygons[0L]);
rOutDev.DrawPolyPolygon(aVclPolyPoly);
}
}
// draw last poly in last color
if(!rColors.empty())
{
const basegfx::BColor aFillColor(rColors[rColors.size() - 1L]);
rOutDev.SetFillColor(Color(aFillColor));
rOutDev.DrawPolygon(aVclPolygons[aVclPolygons.size() - 1L]);
}
// reset drawmode
rOutDev.Pop();
}
} // end of anonymous namespace
} // end of namespace drawinglayer
namespace drawinglayer
{
void impDrawGradientToOutDev(
OutputDevice& rOutDev,
const basegfx::B2DPolyPolygon& rTargetForm,
attribute::GradientStyle eGradientStyle,
sal_uInt32 nSteps,
const basegfx::BColor& rStart,
const basegfx::BColor& rEnd,
double fBorder, double fAngle, double fOffsetX, double fOffsetY, bool bSimple)
{
const basegfx::B2DRange aOutlineRange(basegfx::tools::getRange(rTargetForm));
::std::vector< basegfx::B2DHomMatrix > aMatrices;
::std::vector< basegfx::BColor > aColors;
basegfx::B2DPolygon aUnitPolygon;
// make sure steps is not too high/low
nSteps = impCalcGradientSteps(rOutDev, nSteps, aOutlineRange, sal_uInt32((rStart.getMaximumDistance(rEnd) * 127.5) + 0.5));
// create geometries
switch(eGradientStyle)
{
case attribute::GRADIENTSTYLE_LINEAR:
{
texture::GeoTexSvxGradientLinear aGradient(aOutlineRange, rStart, rEnd, nSteps, fBorder, fAngle);
aGradient.appendTransformations(aMatrices);
aGradient.appendColors(aColors);
aUnitPolygon = basegfx::tools::createUnitPolygon();
break;
}
case attribute::GRADIENTSTYLE_AXIAL:
{
texture::GeoTexSvxGradientAxial aGradient(aOutlineRange, rStart, rEnd, nSteps, fBorder, fAngle);
aGradient.appendTransformations(aMatrices);
aGradient.appendColors(aColors);
aUnitPolygon = basegfx::tools::createPolygonFromRect(basegfx::B2DRange(-1, -1, 1, 1));
break;
}
case attribute::GRADIENTSTYLE_RADIAL:
{
texture::GeoTexSvxGradientRadial aGradient(aOutlineRange, rStart, rEnd, nSteps, fBorder, fOffsetX, fOffsetY);
aGradient.appendTransformations(aMatrices);
aGradient.appendColors(aColors);
aUnitPolygon = basegfx::tools::createPolygonFromCircle(basegfx::B2DPoint(0,0), 1);
break;
}
case attribute::GRADIENTSTYLE_ELLIPTICAL:
{
texture::GeoTexSvxGradientElliptical aGradient(aOutlineRange, rStart, rEnd, nSteps, fBorder, fOffsetX, fOffsetX, fAngle);
aGradient.appendTransformations(aMatrices);
aGradient.appendColors(aColors);
aUnitPolygon = basegfx::tools::createPolygonFromCircle(basegfx::B2DPoint(0,0), 1);
break;
}
case attribute::GRADIENTSTYLE_SQUARE:
{
texture::GeoTexSvxGradientSquare aGradient(aOutlineRange, rStart, rEnd, nSteps, fBorder, fOffsetX, fOffsetX, fAngle);
aGradient.appendTransformations(aMatrices);
aGradient.appendColors(aColors);
aUnitPolygon = basegfx::tools::createPolygonFromRect(basegfx::B2DRange(-1, -1, 1, 1));
break;
}
case attribute::GRADIENTSTYLE_RECT:
{
texture::GeoTexSvxGradientRect aGradient(aOutlineRange, rStart, rEnd, nSteps, fBorder, fOffsetX, fOffsetX, fAngle);
aGradient.appendTransformations(aMatrices);
aGradient.appendColors(aColors);
aUnitPolygon = basegfx::tools::createPolygonFromRect(basegfx::B2DRange(-1, -1, 1, 1));
break;
}
}
// paint them with mask using the XOR method
if(!aMatrices.empty())
{
if(bSimple)
{
impDrawGradientToOutDevSimple(rOutDev, rTargetForm, aMatrices, aColors, aUnitPolygon);
}
else
{
impDrawGradientToOutDevComplex(rOutDev, rTargetForm, aMatrices, aColors, aUnitPolygon);
}
}
}
} // end of namespace drawinglayer
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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