Bjoern Michaelsen
b9337e22ce
see https://gerrit.libreoffice.org/#/c/3367/ and Change-Id: I00c96fa77d04b33a6f8c8cd3490dfcd9bdc9e84a for details Change-Id: I199a75bc4042af20817265d5ef85b1134a96ff5a
218 lines
8.6 KiB
C++
218 lines
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef _BGFX_PIXEL_BPIXEL_HXX
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#define _BGFX_PIXEL_BPIXEL_HXX
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#include <sal/types.h>
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#include <basegfx/numeric/ftools.hxx>
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#include <basegfx/color/bcolor.hxx>
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#include <basegfx/basegfxdllapi.h>
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//////////////////////////////////////////////////////////////////////////////
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// predeclarations
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//////////////////////////////////////////////////////////////////////////////
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namespace basegfx
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{
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class BASEGFX_DLLPUBLIC BPixel
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{
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protected:
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union
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{
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struct
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{
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// bitfield
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unsigned mnR : 8; // red intensity
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unsigned mnG : 8; // green intensity
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unsigned mnB : 8; // blue intensity
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unsigned mnO : 8; // opacity, 0 == full transparence
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} maRGBO;
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struct
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{
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// bitfield
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unsigned mnValue : 32; // all values
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} maCombinedRGBO;
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} maPixelUnion;
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public:
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BPixel()
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{
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maPixelUnion.maCombinedRGBO.mnValue = 0L;
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}
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// use explicit here to make sure everyone knows what he is doing. Values range from
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// 0..255 integer here.
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explicit BPixel(sal_uInt8 nRed, sal_uInt8 nGreen, sal_uInt8 nBlue, sal_uInt8 nOpacity)
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{
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maPixelUnion.maRGBO.mnR = nRed;
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maPixelUnion.maRGBO.mnG = nGreen;
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maPixelUnion.maRGBO.mnB = nBlue;
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maPixelUnion.maRGBO.mnO = nOpacity;
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}
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// constructor from BColor which uses double precision color, so change it
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// to local integer format. It will also be clamped here.
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BPixel(const BColor& rColor, sal_uInt8 nOpacity)
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{
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maPixelUnion.maRGBO.mnR = sal_uInt8((rColor.getRed() * 255.0) + 0.5);
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maPixelUnion.maRGBO.mnG = sal_uInt8((rColor.getGreen() * 255.0) + 0.5);
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maPixelUnion.maRGBO.mnB = sal_uInt8((rColor.getBlue() * 255.0) + 0.5);
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maPixelUnion.maRGBO.mnO = nOpacity;
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}
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// copy constructor
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BPixel(const BPixel& rPixel)
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{
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maPixelUnion.maCombinedRGBO.mnValue = rPixel.maPixelUnion.maCombinedRGBO.mnValue;
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}
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~BPixel()
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{}
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// assignment operator
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BPixel& operator=( const BPixel& rPixel )
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{
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maPixelUnion.maCombinedRGBO.mnValue = rPixel.maPixelUnion.maCombinedRGBO.mnValue;
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return *this;
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}
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// data access read
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sal_uInt8 getRed() const { return maPixelUnion.maRGBO.mnR; }
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sal_uInt8 getGreen() const { return maPixelUnion.maRGBO.mnG; }
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sal_uInt8 getBlue() const { return maPixelUnion.maRGBO.mnB; }
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sal_uInt8 getOpacity() const { return maPixelUnion.maRGBO.mnO; }
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sal_uInt32 getRedGreenBlueOpacity() const { return maPixelUnion.maCombinedRGBO.mnValue; }
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// data access write
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void setRed(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnR = nNew; }
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void setGreen(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnG = nNew; }
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void setBlue(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnB = nNew; }
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void setOpacity(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnO = nNew; }
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void setRedGreenBlueOpacity(sal_uInt32 nRedGreenBlueOpacity) { maPixelUnion.maCombinedRGBO.mnValue = nRedGreenBlueOpacity; }
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void setRedGreenBlue(sal_uInt8 nR, sal_uInt8 nG, sal_uInt8 nB) { maPixelUnion.maRGBO.mnR = nR; maPixelUnion.maRGBO.mnG = nG; maPixelUnion.maRGBO.mnB = nB; }
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// comparators
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bool isInvisible() const { return (0 == maPixelUnion.maRGBO.mnO); }
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bool isVisible() const { return (0 != maPixelUnion.maRGBO.mnO); }
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bool isEmpty() const { return isInvisible(); }
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bool isUsed() const { return isVisible(); }
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bool operator==( const BPixel& rPixel ) const
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{
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return (rPixel.maPixelUnion.maCombinedRGBO.mnValue == maPixelUnion.maCombinedRGBO.mnValue);
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}
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bool operator!=( const BPixel& rPixel ) const
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{
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return (rPixel.maPixelUnion.maCombinedRGBO.mnValue != maPixelUnion.maCombinedRGBO.mnValue);
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}
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// empty element
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static const BPixel& getEmptyBPixel();
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};
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//////////////////////////////////////////////////////////////////////////
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// external operators
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inline BPixel minimum(const BPixel& rTupA, const BPixel& rTupB)
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{
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BPixel aMin(
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(rTupB.getRed() < rTupA.getRed()) ? rTupB.getRed() : rTupA.getRed(),
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(rTupB.getGreen() < rTupA.getGreen()) ? rTupB.getGreen() : rTupA.getGreen(),
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(rTupB.getBlue() < rTupA.getBlue()) ? rTupB.getBlue() : rTupA.getBlue(),
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(rTupB.getOpacity() < rTupA.getOpacity()) ? rTupB.getOpacity() : rTupA.getOpacity());
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return aMin;
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}
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inline BPixel maximum(const BPixel& rTupA, const BPixel& rTupB)
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{
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BPixel aMax(
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(rTupB.getRed() > rTupA.getRed()) ? rTupB.getRed() : rTupA.getRed(),
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(rTupB.getGreen() > rTupA.getGreen()) ? rTupB.getGreen() : rTupA.getGreen(),
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(rTupB.getBlue() > rTupA.getBlue()) ? rTupB.getBlue() : rTupA.getBlue(),
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(rTupB.getOpacity() > rTupA.getOpacity()) ? rTupB.getOpacity() : rTupA.getOpacity());
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return aMax;
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}
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inline BPixel interpolate(const BPixel& rOld1, const BPixel& rOld2, double t)
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{
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if(rOld1 == rOld2)
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{
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return rOld1;
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}
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else if(0.0 >= t)
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{
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return rOld1;
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}
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else if(1.0 <= t)
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{
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return rOld2;
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}
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else
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{
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const sal_uInt32 nFactor(fround(256.0 * t));
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const sal_uInt32 nNegFac(256L - nFactor);
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return BPixel(
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(sal_uInt8)(((sal_uInt32)rOld1.getRed() * nNegFac + (sal_uInt32)rOld2.getRed() * nFactor) >> 8L),
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(sal_uInt8)(((sal_uInt32)rOld1.getGreen() * nNegFac + (sal_uInt32)rOld2.getGreen() * nFactor) >> 8L),
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(sal_uInt8)(((sal_uInt32)rOld1.getBlue() * nNegFac + (sal_uInt32)rOld2.getBlue() * nFactor) >> 8L),
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(sal_uInt8)(((sal_uInt32)rOld1.getOpacity() * nNegFac + (sal_uInt32)rOld2.getOpacity() * nFactor) >> 8L));
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}
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}
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inline BPixel average(const BPixel& rOld1, const BPixel& rOld2)
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{
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if(rOld1 == rOld2)
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{
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return rOld1;
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}
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else
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{
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return BPixel(
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(sal_uInt8)(((sal_uInt32)rOld1.getRed() + (sal_uInt32)rOld2.getRed()) >> 1L),
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(sal_uInt8)(((sal_uInt32)rOld1.getGreen() + (sal_uInt32)rOld2.getGreen()) >> 1L),
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(sal_uInt8)(((sal_uInt32)rOld1.getBlue() + (sal_uInt32)rOld2.getBlue()) >> 1L),
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(sal_uInt8)(((sal_uInt32)rOld1.getOpacity() + (sal_uInt32)rOld2.getOpacity()) >> 1L));
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}
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}
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inline BPixel average(const BPixel& rOld1, const BPixel& rOld2, const BPixel& rOld3)
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{
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if(rOld1 == rOld2 && rOld2 == rOld3)
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{
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return rOld1;
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}
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else
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{
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return BPixel(
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(sal_uInt8)(((sal_uInt32)rOld1.getRed() + (sal_uInt32)rOld2.getRed() + (sal_uInt32)rOld3.getRed()) / 3L),
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(sal_uInt8)(((sal_uInt32)rOld1.getGreen() + (sal_uInt32)rOld2.getGreen() + (sal_uInt32)rOld3.getGreen()) / 3L),
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(sal_uInt8)(((sal_uInt32)rOld1.getBlue() + (sal_uInt32)rOld2.getBlue() + (sal_uInt32)rOld3.getBlue()) / 3L),
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(sal_uInt8)(((sal_uInt32)rOld1.getOpacity() + (sal_uInt32)rOld2.getOpacity() + (sal_uInt32)rOld3.getOpacity()) / 3L));
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}
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}
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} // end of namespace basegfx
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#endif /* _BGFX_PIXEL_BPIXEL_HXX */
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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