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office-gobmx/canvas/source/vcl/impltools.cxx
Thorsten Behrens 3764cfbc69 Remove iota template function & last call site. 
Nice function, but with just one place using it in 9 years best
coded verbatim at the call site...

Change-Id: Ib306cf2311a39299cb007441c7cb1b0d81e67bce
2014-04-15 21:57:56 +02:00

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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 <tools/diagnose_ex.h>
#include <rtl/math.hxx>
#include <com/sun/star/geometry/RealSize2D.hpp>
#include <com/sun/star/geometry/RealPoint2D.hpp>
#include <com/sun/star/geometry/RealRectangle2D.hpp>
#include <com/sun/star/rendering/RenderState.hpp>
#include <com/sun/star/rendering/XCanvas.hpp>
#include <com/sun/star/rendering/XBitmap.hpp>
#include <com/sun/star/rendering/XPolyPolygon2D.hpp>
#include <com/sun/star/geometry/RealBezierSegment2D.hpp>
#include <com/sun/star/rendering/XIntegerBitmap.hpp>
#include <vcl/salbtype.hxx>
#include <vcl/bmpacc.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/metric.hxx>
#include <vcl/canvastools.hxx>
#include <basegfx/point/b2dpoint.hxx>
#include <basegfx/tuple/b2dtuple.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/range/b2drectangle.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/tools/canvastools.hxx>
#include <basegfx/numeric/ftools.hxx>
#include <canvas/canvastools.hxx>
#include "impltools.hxx"
#include "canvasbitmap.hxx"
#include <numeric>
using namespace ::com::sun::star;
namespace vclcanvas
{
namespace tools
{
::BitmapEx bitmapExFromXBitmap( const uno::Reference< rendering::XBitmap >& xBitmap )
{
// TODO(F3): CanvasCustomSprite should also be tunnelled
// through (also implements XIntegerBitmap interface)
CanvasBitmap* pBitmapImpl = dynamic_cast< CanvasBitmap* >( xBitmap.get() );
if( pBitmapImpl )
{
return pBitmapImpl->getBitmap();
}
else
{
SpriteCanvas* pCanvasImpl = dynamic_cast< SpriteCanvas* >( xBitmap.get() );
if( pCanvasImpl && pCanvasImpl->getBackBuffer() )
{
// TODO(F3): mind the plain Canvas impl. Consolidate with CWS canvas05
const ::OutputDevice& rDev( pCanvasImpl->getBackBuffer()->getOutDev() );
const ::Point aEmptyPoint;
return rDev.GetBitmapEx( aEmptyPoint,
rDev.GetOutputSizePixel() );
}
// TODO(F2): add support for floating point bitmap formats
uno::Reference< rendering::XIntegerReadOnlyBitmap > xIntBmp(
xBitmap, uno::UNO_QUERY_THROW );
::BitmapEx aBmpEx = ::vcl::unotools::bitmapExFromXBitmap( xIntBmp );
if( !!aBmpEx )
return aBmpEx;
// TODO(F1): extract pixel from XBitmap interface
ENSURE_OR_THROW( false,
"bitmapExFromXBitmap(): could not extract bitmap" );
}
return ::BitmapEx();
}
bool setupFontTransform( ::Point& o_rPoint,
::Font& io_rVCLFont,
const rendering::ViewState& rViewState,
const rendering::RenderState& rRenderState,
::OutputDevice& rOutDev )
{
::basegfx::B2DHomMatrix aMatrix;
::canvas::tools::mergeViewAndRenderTransform(aMatrix,
rViewState,
rRenderState);
::basegfx::B2DTuple aScale;
::basegfx::B2DTuple aTranslate;
double nRotate, nShearX;
aMatrix.decompose( aScale, aTranslate, nRotate, nShearX );
// query font metric _before_ tampering with width and height
if( !::rtl::math::approxEqual(aScale.getX(), aScale.getY()) )
{
// retrieve true font width
const sal_Int32 nFontWidth( rOutDev.GetFontMetric( io_rVCLFont ).GetWidth() );
const sal_Int32 nScaledFontWidth( ::basegfx::fround(nFontWidth * aScale.getX()) );
if( !nScaledFontWidth )
{
// scale is smaller than one pixel - disable text
// output altogether
return false;
}
io_rVCLFont.SetWidth( nScaledFontWidth );
}
if( !::rtl::math::approxEqual(aScale.getY(), 1.0) )
{
const sal_Int32 nFontHeight( io_rVCLFont.GetHeight() );
io_rVCLFont.SetHeight( ::basegfx::fround(nFontHeight * aScale.getY()) );
}
io_rVCLFont.SetOrientation( static_cast< short >( ::basegfx::fround(-fmod(nRotate, 2*M_PI)*(1800.0/M_PI)) ) );
// TODO(F2): Missing functionality in VCL: shearing
o_rPoint.X() = ::basegfx::fround(aTranslate.getX());
o_rPoint.Y() = ::basegfx::fround(aTranslate.getY());
return true;
}
bool isRectangle( const PolyPolygon& rPolyPoly )
{
// exclude some cheap cases first
if( rPolyPoly.Count() != 1 )
return false;
const ::Polygon& rPoly( rPolyPoly[0] );
sal_uInt16 nCount( rPoly.GetSize() );
if( nCount < 4 )
return false;
// delegate to basegfx
return ::basegfx::tools::isRectangle( rPoly.getB2DPolygon() );
}
// VCL-Canvas related
::Point mapRealPoint2D( const geometry::RealPoint2D& rPoint,
const rendering::ViewState& rViewState,
const rendering::RenderState& rRenderState )
{
::basegfx::B2DPoint aPoint( ::basegfx::unotools::b2DPointFromRealPoint2D(rPoint) );
::basegfx::B2DHomMatrix aMatrix;
aPoint *= ::canvas::tools::mergeViewAndRenderTransform(aMatrix,
rViewState,
rRenderState);
return ::vcl::unotools::pointFromB2DPoint( aPoint );
}
::PolyPolygon mapPolyPolygon( const ::basegfx::B2DPolyPolygon& rPoly,
const rendering::ViewState& rViewState,
const rendering::RenderState& rRenderState )
{
::basegfx::B2DHomMatrix aMatrix;
::canvas::tools::mergeViewAndRenderTransform(aMatrix,
rViewState,
rRenderState);
::basegfx::B2DPolyPolygon aTemp( rPoly );
aTemp.transform( aMatrix );
return ::PolyPolygon( aTemp );
}
::BitmapEx transformBitmap( const BitmapEx& rBitmap,
const ::basegfx::B2DHomMatrix& rTransform,
const uno::Sequence< double >& rDeviceColor,
ModulationMode eModulationMode )
{
SAL_INFO( "canvas.vcl", "::vclcanvas::tools::transformBitmap()" );
SAL_INFO( "canvas.vcl", "::vclcanvas::tools::transformBitmap: 0x" << std::hex << &rBitmap );
// calc transformation and size of bitmap to be
// generated. Note, that the translational components are
// deleted from the transformation; this can be handled by
// an offset when painting the bitmap
const Size aBmpSize( rBitmap.GetSizePixel() );
::basegfx::B2DRectangle aDestRect;
bool bCopyBack( false );
// calc effective transformation for bitmap
const ::basegfx::B2DRectangle aSrcRect( 0, 0,
aBmpSize.Width(),
aBmpSize.Height() );
::canvas::tools::calcTransformedRectBounds( aDestRect,
aSrcRect,
rTransform );
// re-center bitmap, such that it's left, top border is
// aligned with (0,0). The method takes the given
// rectangle, and calculates a transformation that maps
// this rectangle unscaled to the origin.
::basegfx::B2DHomMatrix aLocalTransform;
::canvas::tools::calcRectToOriginTransform( aLocalTransform,
aSrcRect,
rTransform );
const bool bModulateColors( eModulationMode == MODULATE_WITH_DEVICECOLOR &&
rDeviceColor.getLength() > 2 );
const double nRedModulation( bModulateColors ? rDeviceColor[0] : 1.0 );
const double nGreenModulation( bModulateColors ? rDeviceColor[1] : 1.0 );
const double nBlueModulation( bModulateColors ? rDeviceColor[2] : 1.0 );
const double nAlphaModulation( bModulateColors && rDeviceColor.getLength() > 3 ?
rDeviceColor[3] : 1.0 );
Bitmap aSrcBitmap( rBitmap.GetBitmap() );
Bitmap aSrcAlpha;
// differentiate mask and alpha channel (on-off
// vs. multi-level transparency)
if( rBitmap.IsTransparent() )
{
if( rBitmap.IsAlpha() )
aSrcAlpha = rBitmap.GetAlpha().GetBitmap();
else
aSrcAlpha = rBitmap.GetMask();
}
Bitmap::ScopedReadAccess pReadAccess( aSrcBitmap );
Bitmap::ScopedReadAccess pAlphaReadAccess( rBitmap.IsTransparent() ?
aSrcAlpha.AcquireReadAccess() :
(BitmapReadAccess*)NULL,
aSrcAlpha );
if( pReadAccess.get() == NULL ||
(pAlphaReadAccess.get() == NULL && rBitmap.IsTransparent()) )
{
// TODO(E2): Error handling!
ENSURE_OR_THROW( false,
"transformBitmap(): could not access source bitmap" );
}
// mapping table, to translate pAlphaReadAccess' pixel
// values into destination alpha values (needed e.g. for
// paletted 1-bit masks).
sal_uInt8 aAlphaMap[256];
if( rBitmap.IsTransparent() )
{
if( rBitmap.IsAlpha() )
{
// source already has alpha channel - 1:1 mapping,
// i.e. aAlphaMap[0]=0,...,aAlphaMap[255]=255.
sal_uInt8 val=0;
sal_uInt8* pCur=aAlphaMap;
sal_uInt8* const pEnd=&aAlphaMap[256];
while(pCur != pEnd)
*pCur++ = val++;
}
else
{
// mask transparency - determine used palette colors
const BitmapColor& rCol0( pAlphaReadAccess->GetPaletteColor( 0 ) );
const BitmapColor& rCol1( pAlphaReadAccess->GetPaletteColor( 1 ) );
// shortcut for true luminance calculation
// (assumes that palette is grey-level)
aAlphaMap[0] = rCol0.GetRed();
aAlphaMap[1] = rCol1.GetRed();
}
}
// else: mapping table is not used
const Size aDestBmpSize( ::basegfx::fround( aDestRect.getWidth() ),
::basegfx::fround( aDestRect.getHeight() ) );
if( aDestBmpSize.Width() == 0 || aDestBmpSize.Height() == 0 )
return BitmapEx();
Bitmap aDstBitmap( aDestBmpSize, aSrcBitmap.GetBitCount(), &pReadAccess->GetPalette() );
Bitmap aDstAlpha( AlphaMask( aDestBmpSize ).GetBitmap() );
{
// just to be on the safe side: let the
// ScopedAccessors get destructed before
// copy-constructing the resulting bitmap. This will
// rule out the possibility that cached accessor data
// is not yet written back.
Bitmap::ScopedWriteAccess pWriteAccess( aDstBitmap );
Bitmap::ScopedWriteAccess pAlphaWriteAccess( aDstAlpha );
if( pWriteAccess.get() != NULL &&
pAlphaWriteAccess.get() != NULL &&
rTransform.isInvertible() )
{
// we're doing inverse mapping here, i.e. mapping
// points from the destination bitmap back to the
// source
::basegfx::B2DHomMatrix aTransform( aLocalTransform );
aTransform.invert();
// for the time being, always read as ARGB
for( int y=0; y<aDestBmpSize.Height(); ++y )
{
if( bModulateColors )
{
// TODO(P2): Have different branches for
// alpha-only modulation (color
// modulations eq. 1.0)
// modulate all color channels with given
// values
// differentiate mask and alpha channel (on-off
// vs. multi-level transparency)
if( rBitmap.IsTransparent() )
{
// Handling alpha and mask just the same...
for( int x=0; x<aDestBmpSize.Width(); ++x )
{
::basegfx::B2DPoint aPoint(x,y);
aPoint *= aTransform;
const int nSrcX( ::basegfx::fround( aPoint.getX() ) );
const int nSrcY( ::basegfx::fround( aPoint.getY() ) );
if( nSrcX < 0 || nSrcX >= aBmpSize.Width() ||
nSrcY < 0 || nSrcY >= aBmpSize.Height() )
{
pAlphaWriteAccess->SetPixel( y, x, BitmapColor(255) );
}
else
{
// modulate alpha with
// nAlphaModulation. This is a
// little bit verbose, formula
// is 255 - (255-pixAlpha)*nAlphaModulation
// (invert 'alpha' pixel value,
// to get the standard alpha
// channel behaviour)
const sal_uInt8 cMappedAlphaIdx = aAlphaMap[ pAlphaReadAccess->GetPixelIndex( nSrcY, nSrcX ) ];
const sal_uInt8 cModulatedAlphaIdx = 255U - static_cast<sal_uInt8>( nAlphaModulation* (255U - cMappedAlphaIdx) + .5 );
pAlphaWriteAccess->SetPixelIndex( y, x, cModulatedAlphaIdx );
BitmapColor aColor( pReadAccess->GetPixel( nSrcY, nSrcX ) );
aColor.SetRed(
static_cast<sal_uInt8>(
nRedModulation *
aColor.GetRed() + .5 ));
aColor.SetGreen(
static_cast<sal_uInt8>(
nGreenModulation *
aColor.GetGreen() + .5 ));
aColor.SetBlue(
static_cast<sal_uInt8>(
nBlueModulation *
aColor.GetBlue() + .5 ));
pWriteAccess->SetPixel( y, x,
aColor );
}
}
}
else
{
for( int x=0; x<aDestBmpSize.Width(); ++x )
{
::basegfx::B2DPoint aPoint(x,y);
aPoint *= aTransform;
const int nSrcX( ::basegfx::fround( aPoint.getX() ) );
const int nSrcY( ::basegfx::fround( aPoint.getY() ) );
if( nSrcX < 0 || nSrcX >= aBmpSize.Width() ||
nSrcY < 0 || nSrcY >= aBmpSize.Height() )
{
pAlphaWriteAccess->SetPixel( y, x, BitmapColor(255) );
}
else
{
// modulate alpha with
// nAlphaModulation. This is a
// little bit verbose, formula
// is 255 - 255*nAlphaModulation
// (invert 'alpha' pixel value,
// to get the standard alpha
// channel behaviour)
pAlphaWriteAccess->SetPixel( y, x,
BitmapColor(
255U -
static_cast<sal_uInt8>(
nAlphaModulation*255.0
+ .5 ) ) );
BitmapColor aColor( pReadAccess->GetPixel( nSrcY,
nSrcX ) );
aColor.SetRed(
static_cast<sal_uInt8>(
nRedModulation *
aColor.GetRed() + .5 ));
aColor.SetGreen(
static_cast<sal_uInt8>(
nGreenModulation *
aColor.GetGreen() + .5 ));
aColor.SetBlue(
static_cast<sal_uInt8>(
nBlueModulation *
aColor.GetBlue() + .5 ));
pWriteAccess->SetPixel( y, x,
aColor );
}
}
}
}
else
{
// differentiate mask and alpha channel (on-off
// vs. multi-level transparency)
if( rBitmap.IsTransparent() )
{
// Handling alpha and mask just the same...
for( int x=0; x<aDestBmpSize.Width(); ++x )
{
::basegfx::B2DPoint aPoint(x,y);
aPoint *= aTransform;
const int nSrcX( ::basegfx::fround( aPoint.getX() ) );
const int nSrcY( ::basegfx::fround( aPoint.getY() ) );
if( nSrcX < 0 || nSrcX >= aBmpSize.Width() ||
nSrcY < 0 || nSrcY >= aBmpSize.Height() )
{
pAlphaWriteAccess->SetPixelIndex( y, x, 255 );
}
else
{
const sal_uInt8 cAlphaIdx = pAlphaReadAccess->GetPixelIndex( nSrcY, nSrcX );
pAlphaWriteAccess->SetPixelIndex( y, x, aAlphaMap[ cAlphaIdx ] );
pWriteAccess->SetPixel( y, x, pReadAccess->GetPixel( nSrcY, nSrcX ) );
}
}
}
else
{
for( int x=0; x<aDestBmpSize.Width(); ++x )
{
::basegfx::B2DPoint aPoint(x,y);
aPoint *= aTransform;
const int nSrcX( ::basegfx::fround( aPoint.getX() ) );
const int nSrcY( ::basegfx::fround( aPoint.getY() ) );
if( nSrcX < 0 || nSrcX >= aBmpSize.Width() ||
nSrcY < 0 || nSrcY >= aBmpSize.Height() )
{
pAlphaWriteAccess->SetPixel( y, x, BitmapColor(255) );
}
else
{
pAlphaWriteAccess->SetPixel( y, x, BitmapColor(0) );
pWriteAccess->SetPixel( y, x, pReadAccess->GetPixel( nSrcY,
nSrcX ) );
}
}
}
}
}
bCopyBack = true;
}
else
{
// TODO(E2): Error handling!
ENSURE_OR_THROW( false,
"transformBitmap(): could not access bitmap" );
}
}
if( bCopyBack )
return BitmapEx( aDstBitmap, AlphaMask( aDstAlpha ) );
else
return BitmapEx();
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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