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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 <canvas/debug.hxx>
#include <canvas/canvastools.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <tools/diagnose_ex.h>
#include "cairo_canvasbitmap.hxx"
#include <vcl/bmpacc.hxx>
#include <vcl/bitmapex.hxx>
using namespace ::cairo;
using namespace ::com::sun::star;
namespace cairocanvas
{
CanvasBitmap::CanvasBitmap( const ::basegfx::B2ISize& rSize,
const SurfaceProviderRef& rSurfaceProvider,
rendering::XGraphicDevice* pDevice,
bool bHasAlpha ) :
mpSurfaceProvider( rSurfaceProvider ),
mpBufferSurface(),
mpBufferCairo(),
maSize(rSize),
mbHasAlpha(bHasAlpha)
{
ENSURE_OR_THROW( mpSurfaceProvider.is(),
"CanvasBitmap::CanvasBitmap(): Invalid surface or device" );
SAL_INFO(
"canvas.cairo",
"bitmap size: " << rSize.getX() << "x" << rSize.getY());
mpBufferSurface = mpSurfaceProvider->createSurface( rSize, bHasAlpha ? CAIRO_CONTENT_COLOR_ALPHA : CAIRO_CONTENT_COLOR );
mpBufferCairo = mpBufferSurface->getCairo();
maCanvasHelper.init( rSize, *mpSurfaceProvider, pDevice );
maCanvasHelper.setSurface( mpBufferSurface, bHasAlpha );
// clear bitmap to 100% transparent
maCanvasHelper.clear();
}
void CanvasBitmap::disposeThis()
{
mpSurfaceProvider.clear();
mpBufferCairo.reset();
mpBufferSurface.reset();
// forward to parent
CanvasBitmap_Base::disposeThis();
}
SurfaceSharedPtr CanvasBitmap::getSurface()
{
return mpBufferSurface;
}
SurfaceSharedPtr CanvasBitmap::createSurface( const ::basegfx::B2ISize& rSize, int aContent )
{
return mpSurfaceProvider->createSurface(rSize,aContent);
}
SurfaceSharedPtr CanvasBitmap::createSurface( ::Bitmap& rBitmap )
{
return mpSurfaceProvider->createSurface(rBitmap);
}
SurfaceSharedPtr CanvasBitmap::changeSurface( bool, bool )
{
// non-modifiable surface here
return SurfaceSharedPtr();
}
OutputDevice* CanvasBitmap::getOutputDevice()
{
return mpSurfaceProvider->getOutputDevice();
}
bool CanvasBitmap::repaint( const SurfaceSharedPtr& pSurface,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState )
{
return maCanvasHelper.repaint( pSurface, viewState, renderState );
}
uno::Any SAL_CALL CanvasBitmap::getFastPropertyValue( sal_Int32 nHandle ) throw (uno::RuntimeException, std::exception)
{
uno::Any aRV( sal_Int32(0) );
// 0 ... get BitmapEx
// 1 ... get Pixbuf with bitmap RGB content
// 2 ... get Pixbuf with bitmap alpha mask
switch( nHandle )
{
case 0:
{
aRV = uno::Any( reinterpret_cast<sal_Int64>( (BitmapEx *) NULL ) );
if ( !mbHasAlpha )
break;
::Size aSize( maSize.getX(), maSize.getY() );
// FIXME: if we could teach VCL/ about cairo handles, life could
// be significantly better here perhaps.
cairo_surface_t *pPixels;
pPixels = cairo_image_surface_create( CAIRO_FORMAT_ARGB32,
aSize.Width(), aSize.Height() );
cairo_t *pCairo = cairo_create( pPixels );
if( !pPixels || !pCairo || cairo_status(pCairo) != CAIRO_STATUS_SUCCESS )
break;
// suck ourselves from the X server to this buffer so then we can fiddle with
// Alpha to turn it into the ultra-lame vcl required format and then push it
// all back again later at vast expense [ urgh ]
cairo_set_source_surface( pCairo, getSurface()->getCairoSurface().get(), 0, 0 );
cairo_set_operator( pCairo, CAIRO_OPERATOR_SOURCE );
cairo_paint( pCairo );
::Bitmap aRGB( aSize, 24 );
::AlphaMask aMask( aSize );
BitmapWriteAccess *pRGBWrite( aRGB.AcquireWriteAccess() );
if( pRGBWrite )
{
BitmapWriteAccess *pMaskWrite( aMask.AcquireWriteAccess() );
if( pMaskWrite )
{
cairo_surface_flush(pPixels);
unsigned char *pSrc = cairo_image_surface_get_data( pPixels );
unsigned int nStride = cairo_image_surface_get_stride( pPixels );
for( unsigned long y = 0; y < (unsigned long) aSize.Height(); y++ )
{
sal_uInt32 *pPix = reinterpret_cast<sal_uInt32 *>(pSrc + nStride * y);
for( unsigned long x = 0; x < (unsigned long) aSize.Width(); x++ )
{
sal_uInt8 nAlpha = (*pPix >> 24);
sal_uInt8 nR = (*pPix >> 16) & 0xff;
sal_uInt8 nG = (*pPix >> 8) & 0xff;
sal_uInt8 nB = *pPix & 0xff;
if( nAlpha != 0 && nAlpha != 255 )
{
// Cairo uses pre-multiplied alpha - we do not => re-multiply
nR = (sal_uInt8) MinMax( ((sal_uInt32)nR * 255) / nAlpha, 0, 255 );
nG = (sal_uInt8) MinMax( ((sal_uInt32)nG * 255) / nAlpha, 0, 255 );
nB = (sal_uInt8) MinMax( ((sal_uInt32)nB * 255) / nAlpha, 0, 255 );
}
pRGBWrite->SetPixel( y, x, BitmapColor( nR, nG, nB ) );
pMaskWrite->SetPixelIndex( y, x, 255 - nAlpha );
pPix++;
}
}
aMask.ReleaseAccess( pMaskWrite );
}
aRGB.ReleaseAccess( pRGBWrite );
}
// ignore potential errors above. will get caller a
// uniformely white bitmap, but not that there would
// be error handling in calling code ...
::BitmapEx *pBitmapEx = new ::BitmapEx( aRGB, aMask );
cairo_destroy( pCairo );
cairo_surface_destroy( pPixels );
aRV = uno::Any( reinterpret_cast<sal_Int64>( pBitmapEx ) );
break;
}
case 1:
{
aRV = getOutputDevice()->GetNativeSurfaceHandle(mpBufferSurface, maSize);
break;
}
case 2:
{
// Always return nothing - for the RGB surface support.
// Alpha code paths go via the above case 0.
aRV = uno::Any();
break;
}
}
return aRV;
}
OUString SAL_CALL CanvasBitmap::getImplementationName( ) throw (uno::RuntimeException, std::exception)
{
return OUString( "CairoCanvas.CanvasBitmap" );
}
sal_Bool SAL_CALL CanvasBitmap::supportsService( const OUString& ServiceName ) throw (uno::RuntimeException, std::exception)
{
return cppu::supportsService( this, ServiceName );
}
uno::Sequence< OUString > SAL_CALL CanvasBitmap::getSupportedServiceNames( ) throw (uno::RuntimeException, std::exception)
{
uno::Sequence< OUString > aRet(1);
aRet[0] = "com.sun.star.rendering.CanvasBitmap";
return aRet;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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