/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_drawinglayer.hxx"

#include <drawinglayer/primitive2d/textlayoutdevice.hxx>
#include <vcl/timer.hxx>
#include <vcl/virdev.hxx>
#include <vcl/font.hxx>
#include <vcl/metric.hxx>
#include <i18npool/mslangid.hxx>
#include <drawinglayer/primitive2d/textprimitive2d.hxx>
#include <vcl/svapp.hxx>

//////////////////////////////////////////////////////////////////////////////
// VDev RevDevice provider

namespace
{
	class ImpTimedRefDev : public Timer
	{
		ImpTimedRefDev**					mppStaticPointerOnMe;
		VirtualDevice*						mpVirDev;
		sal_uInt32							mnUseCount;

	public:
		ImpTimedRefDev(ImpTimedRefDev** ppStaticPointerOnMe);
		~ImpTimedRefDev();
	    virtual void Timeout();

		VirtualDevice& acquireVirtualDevice();
		void releaseVirtualDevice();
	};

	ImpTimedRefDev::ImpTimedRefDev(ImpTimedRefDev** ppStaticPointerOnMe)
	:	mppStaticPointerOnMe(ppStaticPointerOnMe),
		mpVirDev(0L),
		mnUseCount(0L)
	{
		SetTimeout(3L * 60L * 1000L); // three minutes
		Start();
	}

	ImpTimedRefDev::~ImpTimedRefDev()
	{
		OSL_ENSURE(0L == mnUseCount, "destruction of a still used ImpTimedRefDev (!)");

		if(mppStaticPointerOnMe && *mppStaticPointerOnMe)
		{
			*mppStaticPointerOnMe = 0L;
		}

		if(mpVirDev)
		{
			delete mpVirDev;
		}
	}

	void ImpTimedRefDev::Timeout()
	{
		// for obvious reasons, do not call anything after this
		delete (this);
	}

	VirtualDevice& ImpTimedRefDev::acquireVirtualDevice()
	{
		if(!mpVirDev)
		{
			mpVirDev = new VirtualDevice();
			mpVirDev->SetReferenceDevice( VirtualDevice::REFDEV_MODE_MSO1 );
		}

		if(!mnUseCount)
		{
			Stop();
		}

		mnUseCount++;

		return *mpVirDev;
	}

	void ImpTimedRefDev::releaseVirtualDevice()
	{
		OSL_ENSURE(mnUseCount, "mismatch call number to releaseVirtualDevice() (!)");
		mnUseCount--;

		if(!mnUseCount)
		{
			Start();
		}
	}
} // end of anonymous namespace

//////////////////////////////////////////////////////////////////////////////
// access to one global ImpTimedRefDev incarnation in namespace drawinglayer::primitive

namespace drawinglayer
{
	namespace primitive2d
	{
		// static pointer here
		static ImpTimedRefDev* pImpGlobalRefDev = 0L;

		// static methods here
		VirtualDevice& acquireGlobalVirtualDevice()
		{
			if(!pImpGlobalRefDev)
			{
				pImpGlobalRefDev = new ImpTimedRefDev(&pImpGlobalRefDev);
			}

			return pImpGlobalRefDev->acquireVirtualDevice();
		}

		void releaseGlobalVirtualDevice()
		{
			OSL_ENSURE(pImpGlobalRefDev, "releaseGlobalVirtualDevice() without prior acquireGlobalVirtualDevice() call(!)");
			pImpGlobalRefDev->releaseVirtualDevice();
		}

		TextLayouterDevice::TextLayouterDevice()
		:	mrDevice(acquireGlobalVirtualDevice())
		{
		}

		TextLayouterDevice::~TextLayouterDevice()
		{
			releaseGlobalVirtualDevice();
		}

		void TextLayouterDevice::setFont(const Font& rFont)
		{
			mrDevice.SetFont( rFont );
		}

		void TextLayouterDevice::setFontAttribute(
            const attribute::FontAttribute& rFontAttribute, 
            double fFontScaleX, 
            double fFontScaleY,
            const ::com::sun::star::lang::Locale& rLocale)
		{
			setFont(getVclFontFromFontAttribute(
                rFontAttribute, 
                fFontScaleX, 
                fFontScaleY, 
                0.0,
                rLocale));
        }

        double TextLayouterDevice::getOverlineOffset() const
        {
            const ::FontMetric& rMetric = mrDevice.GetFontMetric();
            double fRet = (rMetric.GetIntLeading() / 2.0) - rMetric.GetAscent();
            return fRet;
        }

		double TextLayouterDevice::getUnderlineOffset() const
		{
			const ::FontMetric& rMetric = mrDevice.GetFontMetric();
			double fRet = rMetric.GetDescent() / 2.0;
			return fRet;
		}

		double TextLayouterDevice::getStrikeoutOffset() const
		{
			const ::FontMetric& rMetric = mrDevice.GetFontMetric();
			double fRet = (rMetric.GetAscent() - rMetric.GetIntLeading()) / 3.0;
			return fRet;
		}

        double TextLayouterDevice::getOverlineHeight() const
        {
            const ::FontMetric& rMetric = mrDevice.GetFontMetric();
            double fRet = rMetric.GetIntLeading() / 2.5;
            return fRet;
        }

		double TextLayouterDevice::getUnderlineHeight() const
		{
			const ::FontMetric& rMetric = mrDevice.GetFontMetric();
			double fRet = rMetric.GetDescent() / 4.0;
			return fRet;
		}

		double TextLayouterDevice::getTextHeight() const
		{
			return mrDevice.GetTextHeight();
		}

		double TextLayouterDevice::getTextWidth(
			const String& rText,
			sal_uInt32 nIndex,
			sal_uInt32 nLength) const
		{
			return mrDevice.GetTextWidth(rText, nIndex, nLength);
		}

		bool TextLayouterDevice::getTextOutlines(
			basegfx::B2DPolyPolygonVector& rB2DPolyPolyVector,
			const String& rText,
			sal_uInt32 nIndex,
			sal_uInt32 nLength,
            const ::std::vector< double >& rDXArray) const
		{
            const sal_uInt32 nDXArrayCount(rDXArray.size());
			sal_uInt32 nTextLength(nLength);
			const sal_uInt32 nStringLength(rText.Len());

			if(nTextLength + nIndex > nStringLength)
			{
				nTextLength = nStringLength - nIndex;
			}
            
            if(nDXArrayCount)
            {
                OSL_ENSURE(nDXArrayCount == nTextLength, "DXArray size does not correspond to text portion size (!)");
    		    std::vector< sal_Int32 > aIntegerDXArray(nDXArrayCount);

                for(sal_uInt32 a(0); a < nDXArrayCount; a++)
                {
                    aIntegerDXArray[a] = basegfx::fround(rDXArray[a]);
                }

                return mrDevice.GetTextOutlines(
                    rB2DPolyPolyVector,
                    rText,
                    nIndex,
                    nIndex,
                    nLength,
                    true,
			        0,
                    &(aIntegerDXArray[0]));
            }
            else
            {
                return mrDevice.GetTextOutlines(
                    rB2DPolyPolyVector,
                    rText,
                    nIndex,
                    nIndex,
                    nLength,
                    true,
			        0,
                    0);
            }
		}

		basegfx::B2DRange TextLayouterDevice::getTextBoundRect(
			const String& rText,
			sal_uInt32 nIndex,
			sal_uInt32 nLength) const
		{
			sal_uInt32 nTextLength(nLength);
			const sal_uInt32 nStringLength(rText.Len());

			if(nTextLength + nIndex > nStringLength)
			{
				nTextLength = nStringLength - nIndex;
			}

			if(nTextLength)
			{
				Rectangle aRect;

				mrDevice.GetTextBoundRect(
                    aRect,
                    rText,
                    nIndex,
                    nIndex,
                    nLength);

                // #i104432#, #i102556# take empty results into account
                if(!aRect.IsEmpty())
                {
    				return basegfx::B2DRange(
						aRect.Left(), aRect.Top(), 
						aRect.Right(), aRect.Bottom());
                }
			}

            return basegfx::B2DRange();
		}

        double TextLayouterDevice::getFontAscent() const
        {
            const ::FontMetric& rMetric = mrDevice.GetFontMetric();
            return rMetric.GetAscent();
        }

        double TextLayouterDevice::getFontDescent() const
        {
            const ::FontMetric& rMetric = mrDevice.GetFontMetric();
            return rMetric.GetDescent();
        }

		void TextLayouterDevice::addTextRectActions(
			const Rectangle& rRectangle,
			const String& rText,
			sal_uInt16 nStyle,
			GDIMetaFile& rGDIMetaFile) const
		{
			mrDevice.AddTextRectActions(
				rRectangle, rText, nStyle, rGDIMetaFile);
		}

		::std::vector< double > TextLayouterDevice::getTextArray(
			const String& rText,
			sal_uInt32 nIndex,
			sal_uInt32 nLength) const
		{
			::std::vector< double > aRetval;
			sal_uInt32 nTextLength(nLength);
			const sal_uInt32 nStringLength(rText.Len());

			if(nTextLength + nIndex > nStringLength)
			{
				nTextLength = nStringLength - nIndex;
			}

			if(nTextLength)
			{
				aRetval.reserve(nTextLength);
				::std::vector<sal_Int32> aDXArray( nTextLength);
				mrDevice.GetTextArray(rText, &aDXArray[0], nIndex, nLength);

				for(sal_uInt32 a(0); a < nTextLength; a++)
				{
					aRetval.push_back(aDXArray[a]);
				}
			}

			return aRetval;
		}

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

//////////////////////////////////////////////////////////////////////////////
// helper methods for vcl font handling

namespace drawinglayer
{
	namespace primitive2d
	{
		Font getVclFontFromFontAttribute(
            const attribute::FontAttribute& rFontAttribute,
            double fFontScaleX,
            double fFontScaleY,
            double fFontRotation,
            const ::com::sun::star::lang::Locale& rLocale)
		{
            // detect FontScaling
			const sal_uInt32 nHeight(basegfx::fround(fabs(fFontScaleY)));
            const sal_uInt32 nWidth(basegfx::fround(fabs(fFontScaleX)));
            const bool bFontIsScaled(nHeight != nWidth);

#ifdef WIN32
            // for WIN32 systems, start with creating an unscaled font. If FontScaling
            // is wanted, that width needs to be adapted using FontMetric again to get a
            // width of the unscaled font
			Font aRetval(
				rFontAttribute.getFamilyName(),
				rFontAttribute.getStyleName(),
				Size(0, nHeight));
#else
            // for non-WIN32 systems things are easier since these accept a Font creation
            // with initially nWidth != nHeight for FontScaling. Despite that, use zero for
            // FontWidth when no scaling is used to explicitely have that zero when e.g. the
            // Font would be recorded in a MetaFile (The MetaFile FontAction WILL record a
            // set FontWidth; import that in a WIN32 system, and trouble is there)
			Font aRetval(
				rFontAttribute.getFamilyName(),
				rFontAttribute.getStyleName(),
                Size(bFontIsScaled ? nWidth : 0, nHeight));
#endif
            // define various other FontAttribute
			aRetval.SetAlign(ALIGN_BASELINE);
			aRetval.SetCharSet(rFontAttribute.getSymbol() ? RTL_TEXTENCODING_SYMBOL : RTL_TEXTENCODING_UNICODE);
			aRetval.SetVertical(rFontAttribute.getVertical() ? sal_True : sal_False);
			aRetval.SetWeight(static_cast<FontWeight>(rFontAttribute.getWeight()));
			aRetval.SetItalic(rFontAttribute.getItalic() ? ITALIC_NORMAL : ITALIC_NONE);
			aRetval.SetOutline(rFontAttribute.getOutline());
            aRetval.SetPitch(rFontAttribute.getMonospaced() ? PITCH_FIXED : PITCH_VARIABLE);
            aRetval.SetLanguage(MsLangId::convertLocaleToLanguage(rLocale));

#ifdef WIN32
            // for WIN32 systems, correct the FontWidth if FontScaling is used
            if(bFontIsScaled && nHeight > 0)
            {
                const FontMetric aUnscaledFontMetric(Application::GetDefaultDevice()->GetFontMetric(aRetval));

                if(aUnscaledFontMetric.GetWidth() > 0)
                {
                    const double fScaleFactor((double)nWidth / (double)nHeight);
                    const sal_uInt32 nScaledWidth(basegfx::fround((double)aUnscaledFontMetric.GetWidth() * fScaleFactor));
                    aRetval.SetWidth(nScaledWidth);
                }
            }
#endif
            // handle FontRotation (if defined)
			if(!basegfx::fTools::equalZero(fFontRotation))
			{
				sal_Int16 aRotate10th((sal_Int16)(fFontRotation * (-1800.0/F_PI)));
				aRetval.SetOrientation(aRotate10th % 3600);
			}

			return aRetval;
		}

        attribute::FontAttribute getFontAttributeFromVclFont(
            basegfx::B2DVector& o_rSize, 
            const Font& rFont, 
            bool bRTL, 
            bool bBiDiStrong)
		{
            const attribute::FontAttribute aRetval(
			    rFont.GetName(),
			    rFont.GetStyleName(),
			    static_cast<sal_uInt16>(rFont.GetWeight()),
                RTL_TEXTENCODING_SYMBOL == rFont.GetCharSet(),
			    rFont.IsVertical(),
			    ITALIC_NONE != rFont.GetItalic(),
                PITCH_FIXED == rFont.GetPitch(),
			    rFont.IsOutline(),
                bRTL,
                bBiDiStrong);
			// TODO: eKerning

            // set FontHeight and init to no FontScaling
            o_rSize.setY(rFont.GetSize().getHeight() > 0 ? rFont.GetSize().getHeight() : 0);
            o_rSize.setX(o_rSize.getY());

#ifdef WIN32
            // for WIN32 systems, the FontScaling at the Font is detected by
            // checking that FontWidth != 0. When FontScaling is used, WIN32
            // needs to do extra stuff to detect the correct width (since it's
            // zero and not equal the font height) and it's relationship to
            // the height
            if(rFont.GetSize().getWidth() > 0)
            {
                Font aUnscaledFont(rFont);
                aUnscaledFont.SetWidth(0);
                const FontMetric aUnscaledFontMetric(Application::GetDefaultDevice()->GetFontMetric(aUnscaledFont));

                if(aUnscaledFontMetric.GetWidth() > 0)
                {
                    const double fScaleFactor((double)rFont.GetSize().getWidth() / (double)aUnscaledFontMetric.GetWidth());
                    o_rSize.setX(fScaleFactor * o_rSize.getY());
                }
            }
#else
            // For non-WIN32 systems the detection is the same, but the value
            // is easier achieved since width == height is interpreted as no
            // scaling. Ergo, Width == 0 means width == height, and width != 0
            // means the scaling is in the direct relation of width to height
            if(rFont.GetSize().getWidth() > 0)
            {
                o_rSize.setX((double)rFont.GetSize().getWidth());
            }
#endif
			return aRetval;
		}
	} // end of namespace primitive2d
} // end of namespace drawinglayer

//////////////////////////////////////////////////////////////////////////////
// eof