vcl/quartz/salbmp.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21 #include <sal/log.hxx>
  22 #include <osl/diagnose.h>
  23
  24 #include <cstddef>
  25 #include <limits>
  26
  27 #include <o3tl/make_shared.hxx>
  28 #include <tools/color.hxx>
  29 #include <vcl/bitmap.hxx>
  30 #include <vcl/BitmapAccessMode.hxx>
  31 #include <vcl/BitmapBuffer.hxx>
  32 #include <vcl/BitmapColor.hxx>
  33 #include <vcl/BitmapPalette.hxx>
  34 #include <vcl/ColorMask.hxx>
  35 #include <vcl/Scanline.hxx>
  36
  37 #include <bitmap/bmpfast.hxx>
  38 #include <quartz/cgutils.h>
  39 #include <quartz/salbmp.h>
  40 #include <quartz/utils.h>
  41 #include <bitmap/ScanlineTools.hxx>
  42
  43 #ifdef MACOSX
  44 #include <osx/saldata.hxx>
  45 #else
  46 #include <ios/iosinst.hxx>
  47 #endif
  48
  49 const unsigned long k32BitRedColorMask   = 0x00ff0000;
  50 const unsigned long k32BitGreenColorMask = 0x0000ff00;
  51 const unsigned long k32BitBlueColorMask  = 0x000000ff;
  52
  53 QuartzSalBitmap::QuartzSalBitmap()
  54   : mxCachedImage( nullptr )
  55   , mnBits(0)
  56   , mnWidth(0)
  57   , mnHeight(0)
  58   , mnBytesPerRow(0)
  59 {
  60 }
  61
  62 QuartzSalBitmap::~QuartzSalBitmap()
  63 {
  64     doDestroy();
  65 }
  66
  67 bool QuartzSalBitmap::Create( const Size& rSize, vcl::PixelFormat ePixelFormat, const BitmapPalette& rBitmapPalette )
  68 {
  69     if (ePixelFormat == vcl::PixelFormat::INVALID)
  70         return false;
  71
  72     maPalette = rBitmapPalette;
  73     mnBits = vcl::pixelFormatBitCount(ePixelFormat);
  74     mnWidth = rSize.Width();
  75     mnHeight = rSize.Height();
  76     return AllocateUserData();
  77 }
  78
  79 bool QuartzSalBitmap::Create( const SalBitmap& rSalBmp )
  80 {
  81     vcl::PixelFormat ePixelFormat = vcl::bitDepthToPixelFormat(rSalBmp.GetBitCount());
  82     return Create( rSalBmp, ePixelFormat);
  83 }
  84
  85 bool QuartzSalBitmap::Create( const SalBitmap& rSalBmp, SalGraphics* pGraphics )
  86 {
  87     vcl::PixelFormat ePixelFormat = vcl::PixelFormat::INVALID;
  88     if (pGraphics)
  89         ePixelFormat = vcl::bitDepthToPixelFormat(pGraphics->GetBitCount());
  90     else
  91         ePixelFormat = vcl::bitDepthToPixelFormat(rSalBmp.GetBitCount());
  92
  93     return Create( rSalBmp, ePixelFormat);
  94 }
  95
  96 bool QuartzSalBitmap::Create( const SalBitmap& rSalBmp, vcl::PixelFormat eNewPixelFormat )
  97 {
  98     const QuartzSalBitmap& rSourceBitmap = static_cast<const QuartzSalBitmap&>(rSalBmp);
  99
 100     if (eNewPixelFormat != vcl::PixelFormat::INVALID && rSourceBitmap.m_pUserBuffer)
 101     {
 102         mnBits = vcl::pixelFormatBitCount(eNewPixelFormat);
 103         mnWidth = rSourceBitmap.mnWidth;
 104         mnHeight = rSourceBitmap.mnHeight;
 105         maPalette = rSourceBitmap.maPalette;
 106
 107         if( AllocateUserData() )
 108         {
 109             ConvertBitmapData( mnWidth, mnHeight, mnBits, mnBytesPerRow, maPalette,
 110                                m_pUserBuffer.get(), rSourceBitmap.mnBits,
 111                                rSourceBitmap.mnBytesPerRow, rSourceBitmap.maPalette,
 112                                rSourceBitmap.m_pUserBuffer.get() );
 113             return true;
 114         }
 115     }
 116     return false;
 117 }
 118
 119 bool QuartzSalBitmap::Create( const css::uno::Reference< css::rendering::XBitmapCanvas >& /*xBitmapCanvas*/,
 120                               Size& /*rSize*/, bool /*bMask*/ )
 121 {
 122     return false;
 123 }
 124
 125 void QuartzSalBitmap::Destroy()
 126 {
 127     doDestroy();
 128 }
 129
 130 void QuartzSalBitmap::doDestroy()
 131 {
 132     DestroyContext();
 133     m_pUserBuffer.reset();
 134 }
 135
 136 void QuartzSalBitmap::DestroyContext()
 137 {
 138     if( mxCachedImage )
 139     {
 140         CGImageRelease( mxCachedImage );
 141         mxCachedImage = nullptr;
 142     }
 143
 144     if (maGraphicContext.isSet())
 145     {
 146         CGContextRelease(maGraphicContext.get());
 147         maGraphicContext.set(nullptr);
 148         m_pContextBuffer.reset();
 149     }
 150 }
 151
 152 bool QuartzSalBitmap::CreateContext()
 153 {
 154     DestroyContext();
 155
 156     // prepare graphics context
 157     // convert image from user input if available
 158     const bool bSkipConversion = !m_pUserBuffer;
 159     if( bSkipConversion )
 160         AllocateUserData();
 161
 162     // default to RGBA color space
 163     CGColorSpaceRef aCGColorSpace = GetSalData()->mxRGBSpace;
 164     CGBitmapInfo aCGBmpInfo = kCGImageAlphaNoneSkipFirst;
 165
 166     // convert data into something accepted by CGBitmapContextCreate()
 167     size_t bitsPerComponent = 8;
 168     sal_uInt32 nContextBytesPerRow = mnBytesPerRow;
 169     if( mnBits == 32 )
 170     {
 171         // no conversion needed for truecolor
 172         m_pContextBuffer = m_pUserBuffer;
 173     }
 174     else if( mnBits == 8 && maPalette.IsGreyPalette8Bit() )
 175     {
 176         // no conversion needed for grayscale
 177         m_pContextBuffer = m_pUserBuffer;
 178         aCGColorSpace = GetSalData()->mxGraySpace;
 179         aCGBmpInfo = kCGImageAlphaNone;
 180         bitsPerComponent = mnBits;
 181     }
 182     // TODO: is special handling for 1bit input buffers worth it?
 183     else
 184     {
 185         // convert user data to 32 bit
 186         nContextBytesPerRow = mnWidth << 2;
 187         try
 188         {
 189             m_pContextBuffer = o3tl::make_shared_array<sal_uInt8>(mnHeight * nContextBytesPerRow);
 190
 191             if( !bSkipConversion )
 192             {
 193                 ConvertBitmapData( mnWidth, mnHeight,
 194                                    32, nContextBytesPerRow, maPalette, m_pContextBuffer.get(),
 195                                    mnBits, mnBytesPerRow, maPalette, m_pUserBuffer.get() );
 196             }
 197         }
 198         catch( const std::bad_alloc& )
 199         {
 200             maGraphicContext.set(nullptr);
 201         }
 202     }
 203
 204     if (m_pContextBuffer)
 205     {
 206         maGraphicContext.set(CGBitmapContextCreate(m_pContextBuffer.get(), mnWidth, mnHeight,
 207                                                    bitsPerComponent, nContextBytesPerRow,
 208                                                    aCGColorSpace, aCGBmpInfo));
 209     }
 210
 211     if (!maGraphicContext.isSet())
 212         m_pContextBuffer.reset();
 213
 214     return maGraphicContext.isSet();
 215 }
 216
 217 bool QuartzSalBitmap::AllocateUserData()
 218 {
 219     Destroy();
 220
 221     if( mnWidth && mnHeight )
 222     {
 223         mnBytesPerRow =  0;
 224
 225         switch( mnBits )
 226         {
 227         case 1:     mnBytesPerRow = (mnWidth + 7) >> 3; break;
 228         case 8:     mnBytesPerRow = mnWidth; break;
 229         case 24:    mnBytesPerRow = (mnWidth << 1) + mnWidth; break;
 230         case 32:    mnBytesPerRow = mnWidth << 2; break;
 231         default:
 232             assert(false && "vcl::QuartzSalBitmap::AllocateUserData(), illegal bitcount!");
 233         }
 234     }
 235
 236     bool alloc = false;
 237     if (mnBytesPerRow != 0 &&
 238         mnBytesPerRow <= std::numeric_limits<sal_uInt32>::max() / mnHeight)
 239     {
 240         try
 241         {
 242             m_pUserBuffer = o3tl::make_shared_array<sal_uInt8>(mnBytesPerRow * mnHeight);
 243             alloc = true;
 244         }
 245         catch (std::bad_alloc &) {}
 246     }
 247     if (!alloc)
 248     {
 249         SAL_WARN( "vcl.quartz", "bad_alloc: " << mnWidth << "x" << mnHeight << " (" << mnBytesPerRow * mnHeight << " bytes)");
 250         m_pUserBuffer.reset();
 251         mnBytesPerRow = 0;
 252     }
 253
 254     return bool(m_pUserBuffer);
 255 }
 256
 257 void QuartzSalBitmap::ConvertBitmapData( sal_uInt32 nWidth, sal_uInt32 nHeight,
 258                                          sal_uInt16 nDestBits, sal_uInt32 nDestBytesPerRow,
 259                                          const BitmapPalette& rDestPalette, sal_uInt8* pDestData,
 260                                          sal_uInt16 nSrcBits, sal_uInt32 nSrcBytesPerRow,
 261                                          const BitmapPalette& rSrcPalette, sal_uInt8* pSrcData )
 262
 263 {
 264     if( (nDestBytesPerRow == nSrcBytesPerRow) &&
 265         (nDestBits == nSrcBits) && ((nSrcBits != 8) || (rDestPalette.operator==( rSrcPalette ))) )
 266     {
 267         // simple case, same format, so just copy
 268         memcpy( pDestData, pSrcData, nHeight * nDestBytesPerRow );
 269         return;
 270     }
 271
 272     // try accelerated conversion if possible
 273     // TODO: are other truecolor conversions except BGR->ARGB worth it?
 274     bool bConverted = false;
 275     if( (nSrcBits == 24) && (nDestBits == 32) )
 276     {
 277         // TODO: extend bmpfast.cxx with a method that can be directly used here
 278         BitmapBuffer aSrcBuf;
 279         aSrcBuf.meFormat = ScanlineFormat::N24BitTcBgr;
 280         aSrcBuf.mpBits = pSrcData;
 281         aSrcBuf.mnBitCount = nSrcBits;
 282         aSrcBuf.mnScanlineSize = nSrcBytesPerRow;
 283         BitmapBuffer aDstBuf;
 284         aDstBuf.meFormat = ScanlineFormat::N32BitTcArgb;
 285         aDstBuf.mpBits = pDestData;
 286         aDstBuf.mnBitCount = nDestBits;
 287         aDstBuf.mnScanlineSize = nDestBytesPerRow;
 288
 289         aSrcBuf.mnWidth = aDstBuf.mnWidth = nWidth;
 290         aSrcBuf.mnHeight = aDstBuf.mnHeight = nHeight;
 291
 292         SalTwoRect aTwoRects(0, 0, mnWidth, mnHeight, 0, 0, mnWidth, mnHeight);
 293         bConverted = ::ImplFastBitmapConversion( aDstBuf, aSrcBuf, aTwoRects );
 294     }
 295
 296     if( !bConverted )
 297     {
 298         // TODO: this implementation is for clarity, not for speed
 299
 300         auto pTarget = vcl::bitmap::getScanlineTransformer(nDestBits, rDestPalette);
 301         auto pSource = vcl::bitmap::getScanlineTransformer(nSrcBits, rSrcPalette);
 302
 303         if (pTarget && pSource)
 304         {
 305             sal_uInt32 nY = nHeight;
 306             while( nY-- )
 307             {
 308                 pTarget->startLine(pDestData);
 309                 pSource->startLine(pSrcData);
 310
 311                 sal_uInt32 nX = nWidth;
 312                 while( nX-- )
 313                 {
 314                     pTarget->writePixel(pSource->readPixel());
 315                 }
 316                 pSrcData += nSrcBytesPerRow;
 317                 pDestData += nDestBytesPerRow;
 318             }
 319         }
 320     }
 321 }
 322
 323 Size QuartzSalBitmap::GetSize() const
 324 {
 325     return Size( mnWidth, mnHeight );
 326 }
 327
 328 sal_uInt16 QuartzSalBitmap::GetBitCount() const
 329 {
 330     return mnBits;
 331 }
 332
 333 namespace {
 334
 335 struct pal_entry
 336 {
 337     sal_uInt8 mnRed;
 338     sal_uInt8 mnGreen;
 339     sal_uInt8 mnBlue;
 340 };
 341
 342 }
 343
 344 pal_entry const aImplSalSysPalEntryAry[ 16 ] =
 345 {
 346 {    0,    0,    0 },
 347 {    0,    0, 0x80 },
 348 {    0, 0x80,    0 },
 349 {    0, 0x80, 0x80 },
 350 { 0x80,    0,    0 },
 351 { 0x80,    0, 0x80 },
 352 { 0x80, 0x80,    0 },
 353 { 0x80, 0x80, 0x80 },
 354 { 0xC0, 0xC0, 0xC0 },
 355 {    0,    0, 0xFF },
 356 {    0, 0xFF,    0 },
 357 {    0, 0xFF, 0xFF },
 358 { 0xFF,    0,    0 },
 359 { 0xFF,    0, 0xFF },
 360 { 0xFF, 0xFF,    0 },
 361 { 0xFF, 0xFF, 0xFF }
 362 };
 363
 364 static const BitmapPalette& GetDefaultPalette( int mnBits, bool bMonochrome )
 365 {
 366     if( bMonochrome )
 367         return Bitmap::GetGreyPalette( 1U << mnBits );
 368
 369     // at this point we should provide some kind of default palette
 370     // since all other platforms do so, too.
 371     static bool bDefPalInit = false;
 372     static BitmapPalette aDefPalette256;
 373     static BitmapPalette aDefPalette2;
 374     if( ! bDefPalInit )
 375     {
 376         bDefPalInit = true;
 377         aDefPalette256.SetEntryCount( 256 );
 378         aDefPalette2.SetEntryCount( 2 );
 379
 380         // Standard colors
 381         unsigned int i;
 382         for( i = 0; i < 16; i++ )
 383         {
 384             aDefPalette256[i] = BitmapColor( aImplSalSysPalEntryAry[i].mnRed,
 385                                              aImplSalSysPalEntryAry[i].mnGreen,
 386                                              aImplSalSysPalEntryAry[i].mnBlue );
 387         }
 388
 389         aDefPalette2[0] = BitmapColor( 0, 0, 0 );
 390         aDefPalette2[1] = BitmapColor( 0xff, 0xff, 0xff );
 391
 392         // own palette (6/6/6)
 393         const int DITHER_PAL_STEPS = 6;
 394         const sal_uInt8 DITHER_PAL_DELTA = 51;
 395         int nB, nG, nR;
 396         sal_uInt8 nRed, nGreen, nBlue;
 397         for( nB=0, nBlue=0; nB < DITHER_PAL_STEPS; nB++, nBlue += DITHER_PAL_DELTA )
 398         {
 399             for( nG=0, nGreen=0; nG < DITHER_PAL_STEPS; nG++, nGreen += DITHER_PAL_DELTA )
 400             {
 401                 for( nR=0, nRed=0; nR < DITHER_PAL_STEPS; nR++, nRed += DITHER_PAL_DELTA )
 402                 {
 403                     aDefPalette256[ i ] = BitmapColor( nRed, nGreen, nBlue );
 404                     i++;
 405                 }
 406             }
 407         }
 408     }
 409
 410     // now fill in appropriate palette
 411     switch( mnBits )
 412     {
 413     case 1: return aDefPalette2;
 414     case 8: return aDefPalette256;
 415     default: break;
 416     }
 417
 418     const static BitmapPalette aEmptyPalette;
 419     return aEmptyPalette;
 420 }
 421
 422 BitmapBuffer* QuartzSalBitmap::AcquireBuffer( BitmapAccessMode /*nMode*/ )
 423 {
 424     // TODO: AllocateUserData();
 425     if (!m_pUserBuffer)
 426         return nullptr;
 427
 428     BitmapBuffer* pBuffer = new BitmapBuffer;
 429     pBuffer->mnWidth = mnWidth;
 430     pBuffer->mnHeight = mnHeight;
 431     pBuffer->maPalette = maPalette;
 432     pBuffer->mnScanlineSize = mnBytesPerRow;
 433     pBuffer->mpBits = m_pUserBuffer.get();
 434     pBuffer->mnBitCount = mnBits;
 435     switch( mnBits )
 436     {
 437         case 1:
 438             pBuffer->meFormat = ScanlineFormat::N1BitMsbPal;
 439             break;
 440         case 8:
 441             pBuffer->meFormat = ScanlineFormat::N8BitPal;
 442             break;
 443         case 24:
 444             pBuffer->meFormat = ScanlineFormat::N24BitTcBgr;
 445             break;
 446         case 32:
 447         {
 448             pBuffer->meFormat = ScanlineFormat::N32BitTcArgb;
 449             ColorMaskElement aRedMask(k32BitRedColorMask);
 450             aRedMask.CalcMaskShift();
 451             ColorMaskElement aGreenMask(k32BitGreenColorMask);
 452             aGreenMask.CalcMaskShift();
 453             ColorMaskElement aBlueMask(k32BitBlueColorMask);
 454             aBlueMask.CalcMaskShift();
 455             pBuffer->maColorMask  = ColorMask(aRedMask, aGreenMask, aBlueMask);
 456             break;
 457         }
 458         default: assert(false);
 459     }
 460
 461     // some BitmapBuffer users depend on a complete palette
 462     if( (mnBits <= 8) && !maPalette )
 463         pBuffer->maPalette = GetDefaultPalette( mnBits, true );
 464
 465     return pBuffer;
 466 }
 467
 468 void QuartzSalBitmap::ReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMode )
 469 {
 470     // invalidate graphic context if we have different data
 471     if( nMode == BitmapAccessMode::Write )
 472     {
 473         maPalette = pBuffer->maPalette;
 474         if (maGraphicContext.isSet())
 475         {
 476             DestroyContext();
 477         }
 478         InvalidateChecksum();
 479     }
 480
 481     delete pBuffer;
 482 }
 483
 484 CGImageRef QuartzSalBitmap::CreateCroppedImage( int nX, int nY, int nNewWidth, int nNewHeight ) const
 485 {
 486     if( !mxCachedImage )
 487     {
 488         if (!maGraphicContext.isSet())
 489         {
 490             if( !const_cast<QuartzSalBitmap*>(this)->CreateContext() )
 491             {
 492                 return nullptr;
 493             }
 494         }
 495         mxCachedImage = CGBitmapContextCreateImage(maGraphicContext.get());
 496     }
 497
 498     CGImageRef xCroppedImage = nullptr;
 499     // short circuit if there is nothing to crop
 500     if( !nX && !nY && (mnWidth == nNewWidth) && (mnHeight == nNewHeight) )
 501     {
 502           xCroppedImage = mxCachedImage;
 503           CFRetain( xCroppedImage );
 504     }
 505     else
 506     {
 507         nY = mnHeight - (nY + nNewHeight); // adjust for y-mirrored context
 508         const CGRect aCropRect = { { static_cast<CGFloat>(nX), static_cast<CGFloat>(nY) }, { static_cast<CGFloat>(nNewWidth), static_cast<CGFloat>(nNewHeight) } };
 509         xCroppedImage = CGImageCreateWithImageInRect( mxCachedImage, aCropRect );
 510     }
 511
 512     return xCroppedImage;
 513 }
 514
 515 static void CFRTLFree(void* /*info*/, const void* data, size_t /*size*/)
 516 {
 517     std::free( const_cast<void*>(data) );
 518 }
 519
 520 CGImageRef QuartzSalBitmap::CreateWithMask( const SalBitmap& rMask,
 521     int nX, int nY, int nWidth, int nHeight ) const
 522 {
 523     return CreateWithSalBitmapAndMask( *this, rMask, nX, nY, nWidth, nHeight );
 524 }
 525
 526 /** creates an image from the given rectangle, replacing all black pixels
 527     with nMaskColor and make all other full transparent */
 528 CGImageRef QuartzSalBitmap::CreateColorMask( int nX, int nY, int nWidth,
 529                                              int nHeight, Color nMaskColor ) const
 530 {
 531     CGImageRef xMask = nullptr;
 532     if (m_pUserBuffer && (nX + nWidth <= mnWidth) && (nY + nHeight <= mnHeight))
 533     {
 534         auto pSourcePixels = vcl::bitmap::getScanlineTransformer(mnBits, maPalette);
 535         // Don't allocate destination buffer if there is no scanline transformer
 536         if( !pSourcePixels )
 537             return xMask;
 538
 539         const sal_uInt32 nDestBytesPerRow = nWidth << 2;
 540         std::unique_ptr<sal_uInt32[]> pMaskBuffer(new (std::nothrow) sal_uInt32[ nHeight * nDestBytesPerRow / 4] );
 541         if( pMaskBuffer )
 542         {
 543             sal_uInt32 nColor;
 544             reinterpret_cast<sal_uInt8*>(&nColor)[0] = 0xff;
 545             reinterpret_cast<sal_uInt8*>(&nColor)[1] = nMaskColor.GetRed();
 546             reinterpret_cast<sal_uInt8*>(&nColor)[2] = nMaskColor.GetGreen();
 547             reinterpret_cast<sal_uInt8*>(&nColor)[3] = nMaskColor.GetBlue();
 548
 549             sal_uInt8* pSource = m_pUserBuffer.get();
 550             sal_uInt32* pDest = pMaskBuffer.get();
 551             // First to nY on y-axis, as that is our starting point (sub-image)
 552             if( nY )
 553                 pSource += nY * mnBytesPerRow;
 554
 555             int y = nHeight;
 556             while( y-- )
 557             {
 558                 pSourcePixels->startLine( pSource );
 559                 pSourcePixels->skipPixel(nX); // Skip on x axis to nX
 560                 sal_uInt32 x = nWidth;
 561                 while( x-- )
 562                 {
 563                     // Fix failure to generate the correct color mask
 564                     // OutputDevice::ImplDrawRotateText() draws black text but
 565                     // that will generate gray pixels due to antialiasing so
 566                     // count dark gray the same as black, light gray the same
 567                     // as white, and the rest as medium gray.
 568                     // The results are not smooth since LibreOffice appears to
 569                     // redraw these semi-transparent masks repeatedly without
 570                     // clearing the background so the semi-transparent pixels
 571                     // will grow darker with repeatedly redraws due to
 572                     // cumulative blending. But it is now better than before.
 573                     sal_uInt8 nAlpha = 255 - pSourcePixels->readPixel().GetRed();
 574                     sal_uInt32 nPremultColor = nColor;
 575                     if ( nAlpha < 192 )
 576                     {
 577                         if ( nAlpha < 64 )
 578                         {
 579                             nPremultColor = 0;
 580                         }
 581                         else
 582                         {
 583                             reinterpret_cast<sal_uInt8*>(&nPremultColor)[0] /= 2;
 584                             reinterpret_cast<sal_uInt8*>(&nPremultColor)[1] /= 2;
 585                             reinterpret_cast<sal_uInt8*>(&nPremultColor)[2] /= 2;
 586                             reinterpret_cast<sal_uInt8*>(&nPremultColor)[3] /= 2;
 587                         }
 588                     }
 589                     *pDest++ = nPremultColor;
 590                 }
 591                 pSource += mnBytesPerRow;
 592             }
 593
 594             CGDataProviderRef xDataProvider( CGDataProviderCreateWithData(nullptr, pMaskBuffer.release(), nHeight * nDestBytesPerRow, &CFRTLFree) );
 595             xMask = CGImageCreate(nWidth, nHeight, 8, 32, nDestBytesPerRow, GetSalData()->mxRGBSpace, kCGImageAlphaPremultipliedFirst, xDataProvider, nullptr, true, kCGRenderingIntentDefault);
 596             CFRelease(xDataProvider);
 597         }
 598     }
 599     return xMask;
 600 }
 601
 602 /** QuartzSalBitmap::GetSystemData Get platform native image data from existing image
 603  *
 604  *  @param rData struct BitmapSystemData, defined in vcl/inc/bitmap.hxx
 605  *  @return true if successful
 606 **/
 607 bool QuartzSalBitmap::GetSystemData( BitmapSystemData& rData )
 608 {
 609     bool bRet = false;
 610
 611     if (!maGraphicContext.isSet())
 612         CreateContext();
 613
 614     if (maGraphicContext.isSet())
 615     {
 616         bRet = true;
 617
 618         if ((CGBitmapContextGetBitsPerPixel(maGraphicContext.get()) == 32) &&
 619             (CGBitmapContextGetBitmapInfo(maGraphicContext.get()) & kCGBitmapByteOrderMask) != kCGBitmapByteOrder32Host)
 620         {
 621             /**
 622              * We need to hack things because VCL does not use kCGBitmapByteOrder32Host, while Cairo requires it.
 623              *
 624              * Not sure what the above comment means. We don't use Cairo on macOS or iOS.
 625              *
 626              * This whole if statement was originally (before 2011) inside #ifdef CAIRO. Did we use Cairo on Mac back then?
 627              * Anyway, nowadays (since many years, I think) we don't, so should this if statement be dropped? Fun.
 628              */
 629
 630             CGImageRef xImage = CGBitmapContextCreateImage(maGraphicContext.get());
 631
 632             // re-create the context with single change: include kCGBitmapByteOrder32Host flag.
 633             CGContextHolder aGraphicContextNew(CGBitmapContextCreate(CGBitmapContextGetData(maGraphicContext.get()),
 634                                                                      CGBitmapContextGetWidth(maGraphicContext.get()),
 635                                                                      CGBitmapContextGetHeight(maGraphicContext.get()),
 636                                                                      CGBitmapContextGetBitsPerComponent(maGraphicContext.get()),
 637                                                                      CGBitmapContextGetBytesPerRow(maGraphicContext.get()),
 638                                                                      CGBitmapContextGetColorSpace(maGraphicContext.get()),
 639                                                                      CGBitmapContextGetBitmapInfo(maGraphicContext.get()) | kCGBitmapByteOrder32Host));
 640             CFRelease(maGraphicContext.get());
 641
 642             // Needs to be flipped
 643             aGraphicContextNew.saveState();
 644             CGContextTranslateCTM (aGraphicContextNew.get(), 0, CGBitmapContextGetHeight(aGraphicContextNew.get()));
 645             CGContextScaleCTM (aGraphicContextNew.get(), 1.0, -1.0);
 646
 647             CGContextDrawImage(aGraphicContextNew.get(), CGRectMake( 0, 0, CGImageGetWidth(xImage), CGImageGetHeight(xImage)), xImage);
 648
 649             // Flip back
 650             CGContextRestoreGState( aGraphicContextNew.get() );
 651             CGImageRelease( xImage );
 652             maGraphicContext = aGraphicContextNew;
 653         }
 654
 655         rData.mnWidth = mnWidth;
 656         rData.mnHeight = mnHeight;
 657     }
 658
 659     return bRet;
 660 }
 661
 662 bool QuartzSalBitmap::ScalingSupported() const
 663 {
 664     return false;
 665 }
 666
 667 bool QuartzSalBitmap::Scale( const double& /*rScaleX*/, const double& /*rScaleY*/, BmpScaleFlag /*nScaleFlag*/ )
 668 {
 669     return false;
 670 }
 671
 672 bool QuartzSalBitmap::Replace( const Color& /*rSearchColor*/, const Color& /*rReplaceColor*/, sal_uInt8 /*nTol*/ )
 673 {
 674     return false;
 675 }
 676
 677 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */