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/* -*- 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 <quartz/cgutils.h>
#include <salbmp.hxx>
#include <osx/saldata.hxx>
static void CFRTLFree(void* /*info*/, const void* data, size_t /*size*/)
{
std::free( const_cast<void*>(data) );
}
CGImageRef CreateWithSalBitmapAndMask( const SalBitmap& rBitmap, const SalBitmap& rMask, int nX, int nY, int nWidth, int nHeight )
{
CGImageRef xImage( rBitmap.CreateCroppedImage( nX, nY, nWidth, nHeight ) );
if( !xImage )
return nullptr;
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) || rMask.GetBitCount() != 8)//(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 = std::malloc( nMaskBytesPerRow * nHeight );
CGContextRef xMaskContext = CGBitmapContextCreate( pMaskMem,
nWidth, nHeight, 8, nMaskBytesPerRow, GetSalData()->mxGraySpace, kCGImageAlphaNone );
CGContextDrawImage( xMaskContext, xImageRect, xMask );
CFRelease( xMask );
CGDataProviderRef xDataProvider( CGDataProviderCreateWithData( nullptr,
pMaskMem, nHeight * nMaskBytesPerRow, &CFRTLFree ) );
static const CGFloat* pDecode = nullptr;
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;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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