More iOS hacking, intermediate commit, certainly not working

1 files changed, 915 insertions, 0 deletions

diff --git a/vcl/ios/source/gdi/salbmp.cxx b/vcl/ios/source/gdi/salbmp.cxx
new file mode 100644
index 000000000000..ea4bdecc811a
--- /dev/null
+++ b/vcl/ios/source/gdi/salbmp.cxx
@@ -0,0 +1,915 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+// MARKER(update_precomp.py): autogen include statement, do not remove
+#include "precompiled_vcl.hxx"
+
+#include <boost/bind.hpp>
+
+#include "basebmp/scanlineformats.hxx"
+#include "basebmp/color.hxx"
+
+#include "basegfx/vector/b2ivector.hxx"
+
+#include "tools/color.hxx"
+
+#include "vcl/bitmap.hxx" // for BitmapSystemData
+#include "vcl/salbtype.hxx"
+
+#include "ios/salbmp.h"
+#include "ios/salinst.h"
+
+#include "bmpfast.hxx"
+
+// =======================================================================
+
+static bool isValidBitCount( sal_uInt16 nBitCount )
+{
+    return (nBitCount == 1) || (nBitCount == 4) || (nBitCount == 8) || (nBitCount == 16) || (nBitCount == 24) || (nBitCount == 32);
+}
+
+// =======================================================================
+
+IosSalBitmap::IosSalBitmap()
+: mxGraphicContext( NULL )
+, mxCachedImage( NULL )
+, mnBits(0)
+, mnWidth(0)
+, mnHeight(0)
+, mnBytesPerRow(0)
+{
+}
+
+// ------------------------------------------------------------------
+
+IosSalBitmap::~IosSalBitmap()
+{
+    Destroy();
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::Create( CGLayerRef xLayer, int nBitmapBits,
+    int nX, int nY, int nWidth, int nHeight, bool /*bMirrorVert*/ )
+{
+    DBG_ASSERT( xLayer, "IosSalBitmap::Create() from non-layered context" );
+
+    // sanitize input parameters
+    if( nX < 0 )
+        nWidth += nX, nX = 0;
+    if( nY < 0 )
+        nHeight += nY, nY = 0;
+    const CGSize aLayerSize = CGLayerGetSize( xLayer );
+    if( nWidth >= (int)aLayerSize.width - nX )
+        nWidth = (int)aLayerSize.width - nX;
+    if( nHeight >= (int)aLayerSize.height - nY )
+        nHeight = (int)aLayerSize.height - nY;
+    if( (nWidth < 0) || (nHeight < 0) )
+        nWidth = nHeight = 0;
+
+    // initialize properties
+    mnWidth  = nWidth;
+    mnHeight = nHeight;
+    mnBits   = nBitmapBits ? nBitmapBits : 32;
+
+    // initialize drawing context
+    CreateContext();
+
+    // copy layer content into the bitmap buffer
+    const CGPoint aSrcPoint = { -nX, -nY };
+    ::CGContextDrawLayerAtPoint( mxGraphicContext, aSrcPoint, xLayer );
+    return true;
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::Create( const Size& rSize, sal_uInt16 nBits, const BitmapPalette& rBitmapPalette )
+{
+    if( !isValidBitCount( nBits ) )
+        return false;
+    maPalette = rBitmapPalette;
+    mnBits = nBits;
+    mnWidth = rSize.Width();
+    mnHeight = rSize.Height();
+    return AllocateUserData();
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::Create( const SalBitmap& rSalBmp )
+{
+    return Create( rSalBmp, rSalBmp.GetBitCount() );
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::Create( const SalBitmap& rSalBmp, SalGraphics* pGraphics )
+{
+    return Create( rSalBmp, pGraphics ? pGraphics->GetBitCount() : rSalBmp.GetBitCount() );
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::Create( const SalBitmap& rSalBmp, sal_uInt16 nNewBitCount )
+{
+    const IosSalBitmap& rSourceBitmap = static_cast<const IosSalBitmap&>(rSalBmp);
+
+    if( isValidBitCount( nNewBitCount ) &&  rSourceBitmap.maUserBuffer.get() )
+    {
+        mnBits = nNewBitCount;
+        mnWidth = rSourceBitmap.mnWidth;
+        mnHeight = rSourceBitmap.mnHeight;
+        maPalette = rSourceBitmap.maPalette;
+
+        if( AllocateUserData() )
+        {
+            ConvertBitmapData( mnWidth, mnHeight, mnBits, mnBytesPerRow, maPalette, maUserBuffer.get(), rSourceBitmap.mnBits, rSourceBitmap.mnBytesPerRow, rSourceBitmap.maPalette, rSourceBitmap.maUserBuffer.get() );
+            return true;
+        }
+    }
+    return false;
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::Create( const ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XBitmapCanvas > /*xBitmapCanvas*/, Size& /*rSize*/, bool /*bMask*/ )
+{
+    return false;
+}
+
+// ------------------------------------------------------------------
+
+void IosSalBitmap::Destroy()
+{
+    DestroyContext();
+    maUserBuffer.reset();
+}
+
+// ------------------------------------------------------------------
+
+void IosSalBitmap::DestroyContext()
+{
+    CGImageRelease( mxCachedImage );
+    mxCachedImage = NULL;
+
+    if( mxGraphicContext )
+    {
+        CGContextRelease( mxGraphicContext );
+        mxGraphicContext = NULL;
+        maContextBuffer.reset();
+    }
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::CreateContext()
+{
+    DestroyContext();
+
+    // prepare graphics context
+    // convert image from user input if available
+    const bool bSkipConversion = !maUserBuffer;
+    if( bSkipConversion )
+        AllocateUserData();
+
+    // default to RGBA color space
+    CGColorSpaceRef aCGColorSpace = GetSalData()->mxRGBSpace;
+    CGBitmapInfo aCGBmpInfo = kCGImageAlphaNoneSkipFirst;
+
+    // convert data into something accepted by CGBitmapContextCreate()
+    size_t bitsPerComponent = (mnBits == 16) ? 5 : 8;
+    sal_uInt32 nContextBytesPerRow = mnBytesPerRow;
+    if( (mnBits == 16) || (mnBits == 32) )
+    {
+        // no conversion needed for truecolor
+        maContextBuffer = maUserBuffer;
+    }
+    else if( (mnBits == 8) && maPalette.IsGreyPalette() )
+    {
+        // no conversion needed for grayscale
+        maContextBuffer = maUserBuffer;
+        aCGColorSpace = GetSalData()->mxGraySpace;
+        aCGBmpInfo = kCGImageAlphaNone;
+        bitsPerComponent = mnBits;
+    }
+    // TODO: is special handling for 1bit input buffers worth it?
+    else
+    {
+        // convert user data to 32 bit
+        nContextBytesPerRow = mnWidth << 2;
+        try
+        {
+            maContextBuffer.reset( new sal_uInt8[ mnHeight * nContextBytesPerRow ] );
+
+            if( !bSkipConversion )
+                ConvertBitmapData( mnWidth, mnHeight,
+                               32, nContextBytesPerRow, maPalette, maContextBuffer.get(),
+                               mnBits, mnBytesPerRow, maPalette, maUserBuffer.get() );
+        }
+        catch( std::bad_alloc )
+        {
+            mxGraphicContext = 0;
+        }
+    }
+
+    if( maContextBuffer.get() )
+    {
+        mxGraphicContext = ::CGBitmapContextCreate( maContextBuffer.get(), mnWidth, mnHeight,
+            bitsPerComponent, nContextBytesPerRow, aCGColorSpace, aCGBmpInfo );
+    }
+
+    if( !mxGraphicContext )
+        maContextBuffer.reset();
+
+    return mxGraphicContext != NULL;
+}
+
+// ------------------------------------------------------------------
+
+bool IosSalBitmap::AllocateUserData()
+{
+    Destroy();
+
+    if( mnWidth && mnHeight )
+    {
+        mnBytesPerRow =  0;
+
+        switch( mnBits )
+        {
+        case 1:     mnBytesPerRow = (mnWidth + 7) >> 3; break;
+        case 4:     mnBytesPerRow = (mnWidth + 1) >> 1; break;
+        case 8:     mnBytesPerRow = mnWidth; break;
+        case 16:    mnBytesPerRow = mnWidth << 1; break;
+        case 24:    mnBytesPerRow = (mnWidth << 1) + mnWidth; break;
+        case 32:    mnBytesPerRow = mnWidth << 2; break;
+        default:
+            OSL_FAIL("vcl::IosSalBitmap::AllocateUserData(), illegal bitcount!");
+        }
+    }
+
+    try
+    {
+        if( mnBytesPerRow )
+            maUserBuffer.reset( new sal_uInt8[mnBytesPerRow * mnHeight] );
+    }
+    catch( const std::bad_alloc& )
+    {
+        OSL_FAIL( "vcl::IosSalBitmap::AllocateUserData: bad alloc" );
+        maUserBuffer.reset( NULL );
+        mnBytesPerRow = 0;
+    }
+
+    return maUserBuffer.get() != 0;
+}
+
+// ------------------------------------------------------------------
+
+class ImplPixelFormat
+{
+protected:
+    sal_uInt8* pData;
+public:
+    static ImplPixelFormat* GetFormat( sal_uInt16 nBits, const BitmapPalette& rPalette );
+
+    virtual void StartLine( sal_uInt8* pLine ) { pData = pLine; }
+    virtual void SkipPixel( sal_uInt32 nPixel ) = 0;
+    virtual ColorData ReadPixel() = 0;
+    virtual void WritePixel( ColorData nColor ) = 0;
+};
+
+class ImplPixelFormat32 : public ImplPixelFormat
+// currently ARGB-format for 32bit depth
+{
+public:
+    virtual void SkipPixel( sal_uInt32 nPixel )
+    {
+        pData += nPixel << 2;
+    }
+    virtual ColorData ReadPixel()
+    {
+        const ColorData c = RGB_COLORDATA( pData[1], pData[2], pData[3] );
+        pData += 4;
+        return c;
+    }
+    virtual void WritePixel( ColorData nColor )
+    {
+        *pData++ = 0;
+        *pData++ = COLORDATA_RED( nColor );
+        *pData++ = COLORDATA_GREEN( nColor );
+        *pData++ = COLORDATA_BLUE( nColor );
+    }
+};
+
+class ImplPixelFormat24 : public ImplPixelFormat
+// currently BGR-format for 24bit depth
+{
+public:
+    virtual void SkipPixel( sal_uInt32 nPixel )
+    {
+        pData += (nPixel << 1) + nPixel;
+    }
+    virtual ColorData ReadPixel()
+    {
+        const ColorData c = RGB_COLORDATA( pData[2], pData[1], pData[0] );
+        pData += 3;
+        return c;
+    }
+    virtual void WritePixel( ColorData nColor )
+    {
+        *pData++ = COLORDATA_BLUE( nColor );
+        *pData++ = COLORDATA_GREEN( nColor );
+        *pData++ = COLORDATA_RED( nColor );
+    }
+};
+
+class ImplPixelFormat16 : public ImplPixelFormat
+// currently R5G6B5-format for 16bit depth
+{
+protected:
+    sal_uInt16* pData16;
+public:
+
+    virtual void StartLine( sal_uInt8* pLine )
+    {
+        pData16 = (sal_uInt16*)pLine;
+    }
+    virtual void SkipPixel( sal_uInt32 nPixel )
+    {
+        pData += nPixel;
+    }
+    virtual ColorData ReadPixel()
+    {
+        const ColorData c = RGB_COLORDATA( (*pData & 0x7c00) >> 7, (*pData & 0x03e0) >> 2 , (*pData & 0x001f) << 3 );
+        pData++;
+        return c;
+    }
+    virtual void WritePixel( ColorData nColor )
+    {
+        *pData++ =  ((COLORDATA_RED( nColor ) & 0xf8 ) << 7 ) ||
+                    ((COLORDATA_GREEN( nColor ) & 0xf8 ) << 2 ) ||
+                    ((COLORDATA_BLUE( nColor ) & 0xf8 ) >> 3 );
+    }
+};
+
+class ImplPixelFormat8 : public ImplPixelFormat
+{
+private:
+    const BitmapPalette& mrPalette;
+
+public:
+    ImplPixelFormat8( const BitmapPalette& rPalette )
+    : mrPalette( rPalette )
+    {
+    }
+    virtual void SkipPixel( sal_uInt32 nPixel )
+    {
+        pData += nPixel;
+    }
+    virtual ColorData ReadPixel()
+    {
+        return mrPalette[ *pData++ ].operator Color().GetColor();
+    }
+    virtual void WritePixel( ColorData nColor )
+    {
+        const BitmapColor aColor( COLORDATA_RED( nColor ), COLORDATA_GREEN( nColor ), COLORDATA_BLUE( nColor ) );
+        *pData++ = static_cast< sal_uInt8 >( mrPalette.GetBestIndex( aColor ) );
+    }
+};
+
+class ImplPixelFormat4 : public ImplPixelFormat
+{
+private:
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+    sal_uInt32 mnShift;
+
+public:
+    ImplPixelFormat4( const BitmapPalette& rPalette )
+    : mrPalette( rPalette )
+    {
+    }
+    virtual void SkipPixel( sal_uInt32 nPixel )
+    {
+        mnX += nPixel;
+        if( (nPixel & 1) )
+            mnShift ^= 4;
+    }
+    virtual void StartLine( sal_uInt8* pLine )
+    {
+        pData = pLine;
+        mnX = 0;
+        mnShift = 4;
+    }
+    virtual ColorData ReadPixel()
+    {
+        const BitmapColor& rColor = mrPalette[( pData[mnX >> 1] >> mnShift) & 0x0f];
+        mnX++;
+        mnShift ^= 4;
+        return rColor.operator Color().GetColor();
+    }
+    virtual void WritePixel( ColorData nColor )
+    {
+        const BitmapColor aColor( COLORDATA_RED( nColor ), COLORDATA_GREEN( nColor ), COLORDATA_BLUE( nColor ) );
+        pData[mnX>>1] &= (0xf0 >> mnShift);
+        pData[mnX>>1] |= (static_cast< sal_uInt8 >( mrPalette.GetBestIndex( aColor ) ) & 0x0f);
+        mnX++;
+        mnShift ^= 4;
+    }
+};
+
+class ImplPixelFormat1 : public ImplPixelFormat
+{
+private:
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+
+public:
+    ImplPixelFormat1( const BitmapPalette& rPalette )
+    : mrPalette( rPalette )
+    {
+    }
+    virtual void SkipPixel( sal_uInt32 nPixel )
+    {
+        mnX += nPixel;
+    }
+    virtual void StartLine( sal_uInt8* pLine )
+    {
+        pData = pLine;
+        mnX = 0;
+    }
+    virtual ColorData ReadPixel()
+    {
+        const BitmapColor& rColor = mrPalette[ (pData[mnX >> 3 ] >> ( 7 - ( mnX & 7 ) )) & 1];
+        mnX++;
+        return rColor.operator Color().GetColor();
+    }
+    virtual void WritePixel( ColorData nColor )
+    {
+        const BitmapColor aColor( COLORDATA_RED( nColor ), COLORDATA_GREEN( nColor ), COLORDATA_BLUE( nColor ) );
+        if( mrPalette.GetBestIndex( aColor ) & 1 )
+            pData[ mnX >> 3 ] |= 1 << ( 7 - ( mnX & 7 ) );
+        else
+            pData[ mnX >> 3 ] &= ~( 1 << ( 7 - ( mnX & 7 ) ) );
+        mnX++;
+    }
+};
+
+ImplPixelFormat* ImplPixelFormat::GetFormat( sal_uInt16 nBits, const BitmapPalette& rPalette )
+{
+    switch( nBits )
+    {
+    case 1: return new ImplPixelFormat1( rPalette );
+    case 4: return new ImplPixelFormat4( rPalette );
+    case 8: return new ImplPixelFormat8( rPalette );
+    case 16: return new ImplPixelFormat16;
+    case 24: return new ImplPixelFormat24;
+    case 32: return new ImplPixelFormat32;
+    }
+
+    return 0;
+}
+
+void IosSalBitmap::ConvertBitmapData( sal_uInt32 nWidth, sal_uInt32 nHeight,
+                                       sal_uInt16 nDestBits, sal_uInt32 nDestBytesPerRow, const BitmapPalette& rDestPalette, sal_uInt8* pDestData,
+                                       sal_uInt16 nSrcBits, sal_uInt32 nSrcBytesPerRow, const BitmapPalette& rSrcPalette, sal_uInt8* pSrcData )
+
+{
+    if( (nDestBytesPerRow == nSrcBytesPerRow) && (nDestBits == nSrcBits) && ((nSrcBits != 8) || (rDestPalette.operator==( rSrcPalette ))) )
+    {
+        // simple case, same format, so just copy
+        memcpy( pDestData, pSrcData, nHeight * nDestBytesPerRow );
+        return;
+    }
+
+    // try accelerated conversion if possible
+    // TODO: are other truecolor conversions except BGR->ARGB worth it?
+    bool bConverted = false;
+    if( (nSrcBits == 24) && (nDestBits == 32) )
+    {
+        // TODO: extend bmpfast.cxx with a method that can be directly used here
+        BitmapBuffer aSrcBuf;
+        aSrcBuf.mnFormat = BMP_FORMAT_24BIT_TC_BGR;
+        aSrcBuf.mpBits = pSrcData;
+        aSrcBuf.mnBitCount = nSrcBits;
+        aSrcBuf.mnScanlineSize = nSrcBytesPerRow;
+        BitmapBuffer aDstBuf;
+        aDstBuf.mnFormat = BMP_FORMAT_32BIT_TC_ARGB;
+        aDstBuf.mpBits = pDestData;
+        aSrcBuf.mnBitCount = nDestBits;
+        aDstBuf.mnScanlineSize = nDestBytesPerRow;
+
+        aSrcBuf.mnWidth = aDstBuf.mnWidth = nWidth;
+        aSrcBuf.mnHeight = aDstBuf.mnHeight = nHeight;
+
+        SalTwoRect aTwoRects;
+        aTwoRects.mnSrcX = aTwoRects.mnDestX = 0;
+        aTwoRects.mnSrcY = aTwoRects.mnDestY = 0;
+        aTwoRects.mnSrcWidth = aTwoRects.mnDestWidth = mnWidth;
+        aTwoRects.mnSrcHeight = aTwoRects.mnDestHeight = mnHeight;
+        bConverted = ::ImplFastBitmapConversion( aDstBuf, aSrcBuf, aTwoRects );
+    }
+
+    if( !bConverted )
+    {
+        // TODO: this implementation is for clarety, not for speed
+
+        ImplPixelFormat* pD = ImplPixelFormat::GetFormat( nDestBits, rDestPalette );
+        ImplPixelFormat* pS = ImplPixelFormat::GetFormat( nSrcBits, rSrcPalette );
+
+        if( pD && pS )
+        {
+            sal_uInt32 nY = nHeight;
+            while( nY-- )
+            {
+                pD->StartLine( pDestData );
+                pS->StartLine( pSrcData );
+
+                sal_uInt32 nX = nWidth;
+                while( nX-- )
+                    pD->WritePixel( pS->ReadPixel() );
+
+                pSrcData += nSrcBytesPerRow;
+                pDestData += nDestBytesPerRow;
+            }
+        }
+        delete pS;
+        delete pD;
+    }
+}
+
+// ------------------------------------------------------------------
+
+Size IosSalBitmap::GetSize() const
+{
+    return Size( mnWidth, mnHeight );
+}
+
+// ------------------------------------------------------------------
+
+sal_uInt16 IosSalBitmap::GetBitCount() const
+{
+    return mnBits;
+}
+
+// ------------------------------------------------------------------
+
+static struct pal_entry
+{
+    sal_uInt8 mnRed;
+    sal_uInt8 mnGreen;
+    sal_uInt8 mnBlue;
+}
+const aImplSalSysPalEntryAry[ 16 ] =
+{
+{    0,    0,    0 },
+{    0,    0, 0x80 },
+{    0, 0x80,    0 },
+{    0, 0x80, 0x80 },
+{ 0x80,    0,    0 },
+{ 0x80,    0, 0x80 },
+{ 0x80, 0x80,    0 },
+{ 0x80, 0x80, 0x80 },
+{ 0xC0, 0xC0, 0xC0 },
+{    0,    0, 0xFF },
+{    0, 0xFF,    0 },
+{    0, 0xFF, 0xFF },
+{ 0xFF,    0,    0 },
+{ 0xFF,    0, 0xFF },
+{ 0xFF, 0xFF,    0 },
+{ 0xFF, 0xFF, 0xFF }
+};
+
+const BitmapPalette& GetDefaultPalette( int mnBits, bool bMonochrome )
+{
+    if( bMonochrome )
+        return Bitmap::GetGreyPalette( 1U << mnBits );
+
+    // at this point we should provide some kind of default palette
+    // since all other platforms do so, too.
+    static bool bDefPalInit = false;
+    static BitmapPalette aDefPalette256;
+    static BitmapPalette aDefPalette16;
+    static BitmapPalette aDefPalette2;
+    if( ! bDefPalInit )
+    {
+        bDefPalInit = true;
+        aDefPalette256.SetEntryCount( 256 );
+        aDefPalette16.SetEntryCount( 16 );
+        aDefPalette2.SetEntryCount( 2 );
+
+        // Standard colors
+        unsigned int i;
+        for( i = 0; i < 16; i++ )
+        {
+            aDefPalette16[i] =
+            aDefPalette256[i] = BitmapColor( aImplSalSysPalEntryAry[i].mnRed,
+                                             aImplSalSysPalEntryAry[i].mnGreen,
+                                             aImplSalSysPalEntryAry[i].mnBlue );
+            }
+
+        aDefPalette2[0] = BitmapColor( 0, 0, 0 );
+        aDefPalette2[1] = BitmapColor( 0xff, 0xff, 0xff );
+
+        // own palette (6/6/6)
+        const int DITHER_PAL_STEPS = 6;
+        const sal_uInt8 DITHER_PAL_DELTA = 51;
+        int nB, nG, nR;
+        sal_uInt8 nRed, nGreen, nBlue;
+        for( nB=0, nBlue=0; nB < DITHER_PAL_STEPS; nB++, nBlue += DITHER_PAL_DELTA )
+        {
+            for( nG=0, nGreen=0; nG < DITHER_PAL_STEPS; nG++, nGreen += DITHER_PAL_DELTA )
+            {
+                for( nR=0, nRed=0; nR < DITHER_PAL_STEPS; nR++, nRed += DITHER_PAL_DELTA )
+                {
+                    aDefPalette256[ i ] = BitmapColor( nRed, nGreen, nBlue );
+                    i++;
+                }
+            }
+        }
+    }
+
+    // now fill in appropriate palette
+    switch( mnBits )
+    {
+    case 1: return aDefPalette2;
+    case 4: return aDefPalette16;
+    case 8: return aDefPalette256;
+    default: break;
+    }
+
+    const static BitmapPalette aEmptyPalette;
+    return aEmptyPalette;
+}
+
+BitmapBuffer* IosSalBitmap::AcquireBuffer( bool /*bReadOnly*/ )
+{
+    if( !maUserBuffer.get() )
+//  || maContextBuffer.get() && (maUserBuffer.get() != maContextBuffer.get()) )
+    {
+        fprintf(stderr,"ASB::Acq(%dx%d,d=%d)\n",mnWidth,mnHeight,mnBits);
+        // TODO: AllocateUserData();
+        return NULL;
+    }
+
+    BitmapBuffer* pBuffer = new BitmapBuffer;
+    pBuffer->mnWidth = mnWidth;
+    pBuffer->mnHeight = mnHeight;
+    pBuffer->maPalette = maPalette;
+    pBuffer->mnScanlineSize = mnBytesPerRow;
+    pBuffer->mpBits = maUserBuffer.get();
+    pBuffer->mnBitCount = mnBits;
+    switch( mnBits )
+    {
+    case 1:     pBuffer->mnFormat = BMP_FORMAT_1BIT_MSB_PAL; break;
+    case 4:     pBuffer->mnFormat = BMP_FORMAT_4BIT_MSN_PAL; break;
+    case 8:     pBuffer->mnFormat = BMP_FORMAT_8BIT_PAL; break;
+    case 16:    pBuffer->mnFormat = BMP_FORMAT_16BIT_TC_MSB_MASK;
+                pBuffer->maColorMask  = ColorMask( k16BitRedColorMask, k16BitGreenColorMask, k16BitBlueColorMask );
+                break;
+    case 24:    pBuffer->mnFormat = BMP_FORMAT_24BIT_TC_BGR; break;
+    case 32:    pBuffer->mnFormat = BMP_FORMAT_32BIT_TC_ARGB;
+                pBuffer->maColorMask  = ColorMask( k32BitRedColorMask, k32BitGreenColorMask, k32BitBlueColorMask );
+                break;
+    }
+    pBuffer->mnFormat |= BMP_FORMAT_BOTTOM_UP;
+
+    // some BitmapBuffer users depend on a complete palette
+    if( (mnBits <= 8) && !maPalette )
+        pBuffer->maPalette = GetDefaultPalette( mnBits, true );
+
+    return pBuffer;
+}
+
+// ------------------------------------------------------------------
+
+void IosSalBitmap::ReleaseBuffer( BitmapBuffer* pBuffer, bool bReadOnly )
+{
+    // invalidate graphic context if we have different data
+    if( !bReadOnly )
+    {
+        maPalette = pBuffer->maPalette;
+        if( mxGraphicContext )
+            DestroyContext();
+    }
+
+    delete pBuffer;
+}
+
+// ------------------------------------------------------------------
+
+CGImageRef IosSalBitmap::CreateCroppedImage( int nX, int nY, int nNewWidth, int nNewHeight ) const
+{
+    if( !mxCachedImage )
+    {
+        if( !mxGraphicContext )
+            if( !const_cast<IosSalBitmap*>(this)->CreateContext() )
+                return NULL;
+
+        mxCachedImage = CGBitmapContextCreateImage( mxGraphicContext );
+    }
+
+    CGImageRef xCroppedImage = NULL;
+    // short circuit if there is nothing to crop
+    if( !nX && !nY && (mnWidth == nNewWidth) && (mnHeight == nNewHeight) )
+    {
+          xCroppedImage = mxCachedImage;
+          CFRetain( xCroppedImage );
+    }
+    else
+    {
+        nY = mnHeight - (nY + nNewHeight); // adjust for y-mirrored context
+        const CGRect aCropRect = {{nX, nY}, {nNewWidth, nNewHeight}};
+        xCroppedImage = CGImageCreateWithImageInRect( mxCachedImage, aCropRect );
+    }
+
+    return xCroppedImage;
+}
+
+// ------------------------------------------------------------------
+
+static void CFRTLFree(void* /*info*/, const void* data, size_t /*size*/)
+{
+    rtl_freeMemory( const_cast<void*>(data) );
+}
+
+CGImageRef IosSalBitmap::CreateWithMask( const IosSalBitmap& rMask,
+    int nX, int nY, int nWidth, int nHeight ) const
+{
+    CGImageRef xImage( CreateCroppedImage( nX, nY, nWidth, nHeight ) );
+    if( !xImage )
+        return NULL;
+
+    CGImageRef xMask = rMask.CreateCroppedImage( nX, nY, nWidth, nHeight );
+    if( !xMask )
+        return xImage;
+
+    // CGImageCreateWithMask() only likes masks or greyscale images => convert if needed
+    // TODO: isolate in an extra method?
+    if( !CGImageIsMask(xMask) || (CGImageGetColorSpace(xMask) != GetSalData()->mxGraySpace) )
+    {
+        const CGRect xImageRect=CGRectMake( 0, 0, nWidth, nHeight );//the rect has no offset
+
+        // create the alpha mask image fitting our image
+        // TODO: is caching the full mask or the subimage mask worth it?
+        int nMaskBytesPerRow = ((nWidth + 3) & ~3);
+        void* pMaskMem = rtl_allocateMemory( nMaskBytesPerRow * nHeight );
+        CGContextRef xMaskContext = CGBitmapContextCreate( pMaskMem,
+            nWidth, nHeight, 8, nMaskBytesPerRow, GetSalData()->mxGraySpace, kCGImageAlphaNone );
+        CGContextDrawImage( xMaskContext, xImageRect, xMask );
+        CFRelease( xMask );
+        CGDataProviderRef xDataProvider( CGDataProviderCreateWithData( NULL,
+        pMaskMem, nHeight * nMaskBytesPerRow, &CFRTLFree ) );
+        static const float* pDecode = NULL;
+        xMask = CGImageMaskCreate( nWidth, nHeight, 8, 8, nMaskBytesPerRow, xDataProvider, pDecode, false );
+        CFRelease( xDataProvider );
+        CFRelease( xMaskContext );
+    }
+
+    if( !xMask )
+        return xImage;
+
+    // combine image and alpha mask
+    CGImageRef xMaskedImage = CGImageCreateWithMask( xImage, xMask );
+    CFRelease( xMask );
+    CFRelease( xImage );
+    return xMaskedImage;
+}
+
+// ------------------------------------------------------------------
+
+/** creates an image from the given rectangle, replacing all black pixels with nMaskColor and make all other full transparent */
+CGImageRef IosSalBitmap::CreateColorMask( int nX, int nY, int nWidth, int nHeight, SalColor nMaskColor ) const
+{
+    CGImageRef xMask = 0;
+    if( maUserBuffer.get() && (nX + nWidth <= mnWidth) && (nY + nHeight <= mnHeight) )
+    {
+        const sal_uInt32 nDestBytesPerRow = nWidth << 2;
+        sal_uInt32* pMaskBuffer = static_cast<sal_uInt32*>( rtl_allocateMemory( nHeight * nDestBytesPerRow ) );
+        sal_uInt32* pDest = pMaskBuffer;
+
+        ImplPixelFormat* pSourcePixels = ImplPixelFormat::GetFormat( mnBits, maPalette );
+
+        if( pMaskBuffer && pSourcePixels )
+        {
+            sal_uInt32 nColor;
+            reinterpret_cast<sal_uInt8*>(&nColor)[0] = 0xff;
+            reinterpret_cast<sal_uInt8*>(&nColor)[1] = SALCOLOR_RED( nMaskColor );
+            reinterpret_cast<sal_uInt8*>(&nColor)[2] = SALCOLOR_GREEN( nMaskColor );
+            reinterpret_cast<sal_uInt8*>(&nColor)[3] = SALCOLOR_BLUE( nMaskColor );
+
+            sal_uInt8* pSource = maUserBuffer.get();
+            if( nY )
+                pSource += nY * mnBytesPerRow;
+
+            int y = nHeight;
+            while( y-- )
+            {
+                pSourcePixels->StartLine( pSource );
+                pSourcePixels->SkipPixel(nX);
+                sal_uInt32 x = nWidth;
+                while( x-- )
+                {
+                    *pDest++ = ( pSourcePixels->ReadPixel() == 0 ) ? nColor : 0;
+                }
+                pSource += mnBytesPerRow;
+            }
+
+            CGDataProviderRef xDataProvider( CGDataProviderCreateWithData(NULL, pMaskBuffer, nHeight * nDestBytesPerRow, &CFRTLFree) );
+            xMask = CGImageCreate(nWidth, nHeight, 8, 32, nDestBytesPerRow, GetSalData()->mxRGBSpace, kCGImageAlphaPremultipliedFirst, xDataProvider, NULL, true, kCGRenderingIntentDefault);
+            CFRelease(xDataProvider);
+        }
+        else
+        {
+            free(pMaskBuffer);
+        }
+
+        delete pSourcePixels;
+    }
+    return xMask;
+}
+
+// =======================================================================
+
+/** IosSalBitmap::GetSystemData Get platform native image data from existing image
+ *
+ *  @param rData struct BitmapSystemData, defined in vcl/inc/bitmap.hxx
+ *  @return true if successful
+**/
+bool IosSalBitmap::GetSystemData( BitmapSystemData& rData )
+{
+    bool bRet = false;
+
+    if( !mxGraphicContext )
+        CreateContext();
+
+    if ( mxGraphicContext )
+    {
+        bRet = true;
+
+        if ((CGBitmapContextGetBitsPerPixel(mxGraphicContext) == 32) &&
+            (CGBitmapContextGetBitmapInfo(mxGraphicContext) & kCGBitmapByteOrderMask) != kCGBitmapByteOrder32Host) {
+            /**
+             * We need to hack things because VCL does not use kCGBitmapByteOrder32Host, while Cairo requires it.
+             */
+            OSL_TRACE("IosSalBitmap::%s(): kCGBitmapByteOrder32Host not found => inserting it.",__func__);
+
+            CGImageRef xImage = CGBitmapContextCreateImage (mxGraphicContext);
+
+            // re-create the context with single change: include kCGBitmapByteOrder32Host flag.
+            CGContextRef mxGraphicContextNew = CGBitmapContextCreate( CGBitmapContextGetData(mxGraphicContext),
+                                                                      CGBitmapContextGetWidth(mxGraphicContext),
+                                                                      CGBitmapContextGetHeight(mxGraphicContext),
+                                                                      CGBitmapContextGetBitsPerComponent(mxGraphicContext),
+                                                                      CGBitmapContextGetBytesPerRow(mxGraphicContext),
+                                                                      CGBitmapContextGetColorSpace(mxGraphicContext),
+                                                                      CGBitmapContextGetBitmapInfo(mxGraphicContext) | kCGBitmapByteOrder32Host);
+            CFRelease(mxGraphicContext);
+
+            // Needs to be flipped
+            CGContextSaveGState( mxGraphicContextNew );
+            CGContextTranslateCTM (mxGraphicContextNew, 0, CGBitmapContextGetHeight(mxGraphicContextNew));
+            CGContextScaleCTM (mxGraphicContextNew, 1.0, -1.0);
+
+            CGContextDrawImage(mxGraphicContextNew, CGRectMake( 0, 0, CGImageGetWidth(xImage), CGImageGetHeight(xImage)), xImage);
+
+            // Flip back
+            CGContextRestoreGState( mxGraphicContextNew );
+
+            CGImageRelease( xImage );
+            mxGraphicContext = mxGraphicContextNew;
+        }
+
+        rData.rImageContext = (void *) mxGraphicContext;
+        rData.mnWidth = mnWidth;
+        rData.mnHeight = mnHeight;
+    }
+
+    return bRet;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */