libreoffice/drawinglayer/source/primitive2d/textprimitive2d.cxx

/* -*- 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 <drawinglayer/primitive2d/textprimitive2d.hxx>
#include <drawinglayer/primitive2d/textlayoutdevice.hxx>
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <drawinglayer/primitive2d/polypolygonprimitive2d.hxx>
#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>
#include <drawinglayer/primitive2d/texteffectprimitive2d.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>


using namespace com::sun::star;


namespace
{
    // adapts fontScale for usage with TextLayouter. Input is rScale which is the extracted
    // scale from a text transformation. A copy is modified so that it contains only positive
    // scalings and XY-equal scalings to allow to get a non-X-scaled Vcl-Font for TextLayouter.
    // rScale is adapted accordingly to contain the corrected scale which would need to be
    // applied to e.g. outlines received from TextLayouter under usage of fontScale. This
    // includes Y-Scale, X-Scale-correction and mirrorings.
    basegfx::B2DVector getCorrectedScaleAndFontScale(basegfx::B2DVector& rScale)
    {
        // copy input value
        basegfx::B2DVector aFontScale(rScale);

        // correct FontHeight settings
        if(basegfx::fTools::equalZero(aFontScale.getY()))
        {
            // no font height; choose one and adapt scale to get back to original scaling
            static double fDefaultFontScale(100.0);
            rScale.setY(1.0 / fDefaultFontScale);
            aFontScale.setY(fDefaultFontScale);
        }
        else if(basegfx::fTools::less(aFontScale.getY(), 0.0))
        {
            // negative font height; invert and adapt scale to get back to original scaling
            aFontScale.setY(-aFontScale.getY());
            rScale.setY(-1.0);
        }
        else
        {
            // positive font height; adapt scale; scaling will be part of the polygons
            rScale.setY(1.0);
        }

        // correct FontWidth settings
        if(basegfx::fTools::equal(aFontScale.getX(), aFontScale.getY()))
        {
            // no FontScale, adapt scale
            rScale.setX(1.0);
        }
        else
        {
            // If FontScale is used, force to no FontScale to get a non-scaled VCL font.
            // Adapt scaling in X accordingly.
            rScale.setX(aFontScale.getX() / aFontScale.getY());
            aFontScale.setX(aFontScale.getY());
        }

        return aFontScale;
    }
} // end of anonymous namespace


namespace drawinglayer
{
    namespace primitive2d
    {
        void TextSimplePortionPrimitive2D::getTextOutlinesAndTransformation(basegfx::B2DPolyPolygonVector& rTarget, basegfx::B2DHomMatrix& rTransformation) const
        {
            if(getTextLength())
            {
                // decompose object transformation to single values
                basegfx::B2DVector aScale, aTranslate;
                double fRotate, fShearX;

                // if decomposition returns false, create no geometry since e.g. scaling may
                // be zero
                if(getTextTransform().decompose(aScale, aTranslate, fRotate, fShearX))
                {
                    // handle special case: If scale is negative in (x,y) (3rd quadrant), it can
                    // be expressed as rotation by PI
                    if(basegfx::fTools::less(aScale.getX(), 0.0) && basegfx::fTools::less(aScale.getY(), 0.0))
                    {
                        aScale = basegfx::absolute(aScale);
                        fRotate += F_PI;
                    }

                    // for the TextLayouterDevice, it is necessary to have a scaling representing
                    // the font size. Since we want to extract polygons here, it is okay to
                    // work just with scaling and to ignore shear, rotation and translation,
                    // all that can be applied to the polygons later
                    const basegfx::B2DVector aFontScale(getCorrectedScaleAndFontScale(aScale));

                    // prepare textlayoutdevice
                    TextLayouterDevice aTextLayouter;
                    aTextLayouter.setFontAttribute(
                        getFontAttribute(),
                        aFontScale.getX(),
                        aFontScale.getY(),
                        getLocale());

                    // When getting outlines from stretched text (aScale.getX() != 1.0) it
                    // is necessary to inverse-scale the DXArray (if used) to not get the
                    // outlines already aligned to given, but wrong DXArray
                    if(getDXArray().size() && !basegfx::fTools::equal(aScale.getX(), 1.0))
                    {
                        std::vector< double > aScaledDXArray = getDXArray();
                        const double fDXArrayScale(1.0 / aScale.getX());

                        for(double & a : aScaledDXArray)
                        {
                            a *= fDXArrayScale;
                        }

                        // get the text outlines
                        aTextLayouter.getTextOutlines(
                            rTarget,
                            getText(),
                            getTextPosition(),
                            getTextLength(),
                            aScaledDXArray);
                    }
                    else
                    {
                        // get the text outlines
                        aTextLayouter.getTextOutlines(
                            rTarget,
                            getText(),
                            getTextPosition(),
                            getTextLength(),
                            getDXArray());
                    }

                    // create primitives for the outlines
                    const sal_uInt32 nCount(rTarget.size());

                    if(nCount)
                    {
                        // prepare object transformation for polygons
                        rTransformation = basegfx::utils::createScaleShearXRotateTranslateB2DHomMatrix(
                            aScale, fShearX, fRotate, aTranslate);
                    }
                }
            }
        }

        void TextSimplePortionPrimitive2D::create2DDecomposition(Primitive2DContainer& rContainer, const geometry::ViewInformation2D& /*rViewInformation*/) const
        {
            if(!getTextLength())
                return;

            Primitive2DContainer aRetval;
            basegfx::B2DPolyPolygonVector aB2DPolyPolyVector;
            basegfx::B2DHomMatrix aPolygonTransform;

            // get text outlines and their object transformation
            getTextOutlinesAndTransformation(aB2DPolyPolyVector, aPolygonTransform);

            // create primitives for the outlines
            const sal_uInt32 nCount(aB2DPolyPolyVector.size());

            if(!nCount)
                return;

            // alloc space for the primitives
            aRetval.resize(nCount);

            // color-filled polypolygons
            for(sal_uInt32 a(0); a < nCount; a++)
            {
                // prepare polypolygon
                basegfx::B2DPolyPolygon& rPolyPolygon = aB2DPolyPolyVector[a];
                rPolyPolygon.transform(aPolygonTransform);
                aRetval[a] = new PolyPolygonColorPrimitive2D(rPolyPolygon, getFontColor());
            }

            if(getFontAttribute().getOutline())
            {
                // decompose polygon transformation to single values
                basegfx::B2DVector aScale, aTranslate;
                double fRotate, fShearX;
                aPolygonTransform.decompose(aScale, aTranslate, fRotate, fShearX);

                // create outline text effect with current content and replace
                Primitive2DReference aNewTextEffect(new TextEffectPrimitive2D(
                    aRetval,
                    aTranslate,
                    fRotate,
                    TextEffectStyle2D::Outline));

                aRetval = Primitive2DContainer { aNewTextEffect };
            }

            rContainer.insert(rContainer.end(), aRetval.begin(), aRetval.end());
        }

        TextSimplePortionPrimitive2D::TextSimplePortionPrimitive2D(
            const basegfx::B2DHomMatrix& rNewTransform,
            const OUString& rText,
            sal_Int32 nTextPosition,
            sal_Int32 nTextLength,
            const std::vector< double >& rDXArray,
            const attribute::FontAttribute& rFontAttribute,
            const css::lang::Locale& rLocale,
            const basegfx::BColor& rFontColor,
            bool bFilled,
            long nWidthToFill,
            const Color& rTextFillColor)
        :   BufferedDecompositionPrimitive2D(),
            maTextTransform(rNewTransform),
            maText(rText),
            mnTextPosition(nTextPosition),
            mnTextLength(nTextLength),
            maDXArray(rDXArray),
            maFontAttribute(rFontAttribute),
            maLocale(rLocale),
            maFontColor(rFontColor),
            mbFilled(bFilled),
            mnWidthToFill(nWidthToFill),
            maTextFillColor(rTextFillColor),
            maB2DRange()
        {
#if OSL_DEBUG_LEVEL > 0
            const sal_Int32 aStringLength(getText().getLength());
            OSL_ENSURE(aStringLength >= getTextPosition() && aStringLength >= getTextPosition() + getTextLength(),
                "TextSimplePortionPrimitive2D with text out of range (!)");
#endif
        }

        bool LocalesAreEqual(const css::lang::Locale& rA, const css::lang::Locale& rB)
        {
            return (rA.Language == rB.Language
                && rA.Country == rB.Country
                && rA.Variant == rB.Variant);
        }

        bool TextSimplePortionPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
        {
            if(BufferedDecompositionPrimitive2D::operator==(rPrimitive))
            {
                const TextSimplePortionPrimitive2D& rCompare = static_cast<const TextSimplePortionPrimitive2D&>(rPrimitive);

                return (getTextTransform() == rCompare.getTextTransform()
                    && getText() == rCompare.getText()
                    && getTextPosition() == rCompare.getTextPosition()
                    && getTextLength() == rCompare.getTextLength()
                    && getDXArray() == rCompare.getDXArray()
                    && getFontAttribute() == rCompare.getFontAttribute()
                    && LocalesAreEqual(getLocale(), rCompare.getLocale())
                    && getFontColor() == rCompare.getFontColor()
                    && mbFilled == rCompare.mbFilled
                    && mnWidthToFill == rCompare.mnWidthToFill
                    && maTextFillColor == rCompare.maTextFillColor);
            }

            return false;
        }

        basegfx::B2DRange TextSimplePortionPrimitive2D::getB2DRange(const geometry::ViewInformation2D& /*rViewInformation*/) const
        {
            if(maB2DRange.isEmpty() && getTextLength())
            {
                // get TextBoundRect as base size
                // decompose object transformation to single values
                basegfx::B2DVector aScale, aTranslate;
                double fRotate, fShearX;

                if(getTextTransform().decompose(aScale, aTranslate, fRotate, fShearX))
                {
                    // for the TextLayouterDevice, it is necessary to have a scaling representing
                    // the font size. Since we want to extract polygons here, it is okay to
                    // work just with scaling and to ignore shear, rotation and translation,
                    // all that can be applied to the polygons later
                    const basegfx::B2DVector aFontScale(getCorrectedScaleAndFontScale(aScale));

                    // prepare textlayoutdevice
                    TextLayouterDevice aTextLayouter;
                    aTextLayouter.setFontAttribute(
                        getFontAttribute(),
                        aFontScale.getX(),
                        aFontScale.getY(),
                        getLocale());

                    // get basic text range
                    basegfx::B2DRange aNewRange(aTextLayouter.getTextBoundRect(getText(), getTextPosition(), getTextLength()));

                    // #i104432#, #i102556# take empty results into account
                    if(!aNewRange.isEmpty())
                    {
                        // prepare object transformation for range
                        const basegfx::B2DHomMatrix aRangeTransformation(basegfx::utils::createScaleShearXRotateTranslateB2DHomMatrix(
                            aScale, fShearX, fRotate, aTranslate));

                        // apply range transformation to it
                        aNewRange.transform(aRangeTransformation);

                        // assign to buffered value
                        const_cast< TextSimplePortionPrimitive2D* >(this)->maB2DRange = aNewRange;
                    }
                }
            }

            return maB2DRange;
        }

        // provide unique ID
        ImplPrimitive2DIDBlock(TextSimplePortionPrimitive2D, PRIMITIVE2D_ID_TEXTSIMPLEPORTIONPRIMITIVE2D)

    } // end of namespace primitive2d
} // end of namespace drawinglayer

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