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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 <sal/config.h>
#include <tuple>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include <basegfx/numeric/ftools.hxx>
#include <basegfx/point/b2dpoint.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/range/b2drectangle.hxx>
#include <basegfx/utils/canvastools.hxx>
#include <basegfx/utils/keystoplerp.hxx>
#include <basegfx/utils/lerp.hxx>
#include <basegfx/utils/tools.hxx>
#include <com/sun/star/rendering/TexturingMode.hpp>
#include <rtl/math.hxx>
#include <tools/diagnose_ex.h>
#include <canvas/parametricpolypolygon.hxx>
#include "dx_canvashelper.hxx"
#include "dx_impltools.hxx"
#include "dx_spritecanvas.hxx"
using namespace ::com::sun::star;
namespace dxcanvas
{
namespace
{
typedef std::shared_ptr< Gdiplus::PathGradientBrush > PathGradientBrushSharedPtr;
bool fillLinearGradient( GraphicsSharedPtr const & rGraphics,
const ::canvas::ParametricPolyPolygon::Values& /*rValues*/,
const std::vector< Gdiplus::Color >& rColors,
const std::vector< Gdiplus::REAL >& rStops,
const GraphicsPathSharedPtr& rFillPath,
const rendering::Texture& texture )
{
// setup a linear gradient with given colors
Gdiplus::LinearGradientBrush aBrush(
Gdiplus::PointF(0.0f,
0.5f),
Gdiplus::PointF(1.0f,
0.5f),
rColors[0],
rColors[1] );
aBrush.SetInterpolationColors(&rColors[0],
&rStops[0],
rColors.size());
// render background color, as LinearGradientBrush does not
// properly support the WrapModeClamp repeat mode
Gdiplus::SolidBrush aBackgroundBrush( rColors[0] );
rGraphics->FillPath( &aBackgroundBrush, rFillPath.get() );
// TODO(F2): This does not yet support other repeat modes
// except clamp, and probably also no multi-texturing
// calculate parallelogram of gradient in object space, extend
// top and bottom of it such that they cover the whole fill
// path bound area
::basegfx::B2DHomMatrix aTextureTransform;
::basegfx::unotools::homMatrixFromAffineMatrix( aTextureTransform,
texture.AffineTransform );
::basegfx::B2DPoint aLeftTop( 0.0, 0.0 );
::basegfx::B2DPoint aLeftBottom( 0.0, 1.0 );
::basegfx::B2DPoint aRightTop( 1.0, 0.0 );
::basegfx::B2DPoint aRightBottom( 1.0, 1.0 );
aLeftTop *= aTextureTransform;
aLeftBottom *= aTextureTransform;
aRightTop *= aTextureTransform;
aRightBottom*= aTextureTransform;
Gdiplus::RectF aBounds;
rFillPath->GetBounds( &aBounds );
// now, we potentially have to enlarge our gradient area
// atop and below the transformed [0,1]x[0,1] unit rect,
// for the gradient to fill the complete bound rect.
::basegfx::utils::infiniteLineFromParallelogram( aLeftTop,
aLeftBottom,
aRightTop,
aRightBottom,
tools::b2dRangeFromGdiPlusRectF( aBounds ) );
// calc length of bound rect diagonal
const double nDiagonalLength(
hypot( aBounds.Width,
aBounds.Height ) );
// generate a path which covers the 'right' side of the
// gradient, extending two times the bound rect diagonal to
// the right (and thus covering the whole half plane 'right'
// of the gradient). Take the middle of the gradient as the
// 'left' side of the polygon, to not fall victim to rounding
// errors at the edge.
::basegfx::B2DVector aDirection( aLeftTop - aLeftBottom );
aDirection = ::basegfx::getNormalizedPerpendicular( aDirection );
aDirection *= nDiagonalLength;
const ::basegfx::B2DPoint aHalfPlaneLeftTop( (aLeftTop + aRightTop) * 0.5 );
const ::basegfx::B2DPoint aHalfPlaneLeftBottom( (aLeftBottom + aRightBottom) * 0.5 );
const ::basegfx::B2DPoint aHalfPlaneRightTop( aRightTop + aDirection );
const ::basegfx::B2DPoint aHalfPlaneRightBottom( aRightBottom + aDirection );
Gdiplus::GraphicsPath aSolidFillPath;
aSolidFillPath.AddLine( static_cast<Gdiplus::REAL>(aHalfPlaneLeftTop.getX()),
static_cast<Gdiplus::REAL>(aHalfPlaneLeftTop.getY()),
static_cast<Gdiplus::REAL>(aHalfPlaneRightTop.getX()),
static_cast<Gdiplus::REAL>(aHalfPlaneRightTop.getY()) );
aSolidFillPath.AddLine( static_cast<Gdiplus::REAL>(aHalfPlaneRightBottom.getX()),
static_cast<Gdiplus::REAL>(aHalfPlaneRightBottom.getY()),
static_cast<Gdiplus::REAL>(aHalfPlaneLeftBottom.getX()),
static_cast<Gdiplus::REAL>(aHalfPlaneLeftBottom.getY()) );
aSolidFillPath.CloseFigure();
// limit output to fill path, we've just generated a path that
// might be substantially larger
if( Gdiplus::Ok != rGraphics->SetClip( rFillPath.get(),
Gdiplus::CombineModeIntersect ) )
{
return false;
}
Gdiplus::SolidBrush aBackgroundBrush2( rColors.back() );
rGraphics->FillPath( &aBackgroundBrush2, &aSolidFillPath );
// generate clip polygon from the extended parallelogram
// (exploit the feature that distinct lines in a figure are
// automatically closed by a straight line)
Gdiplus::GraphicsPath aClipPath;
aClipPath.AddLine( static_cast<Gdiplus::REAL>(aLeftTop.getX()),
static_cast<Gdiplus::REAL>(aLeftTop.getY()),
static_cast<Gdiplus::REAL>(aRightTop.getX()),
static_cast<Gdiplus::REAL>(aRightTop.getY()) );
aClipPath.AddLine( static_cast<Gdiplus::REAL>(aRightBottom.getX()),
static_cast<Gdiplus::REAL>(aRightBottom.getY()),
static_cast<Gdiplus::REAL>(aLeftBottom.getX()),
static_cast<Gdiplus::REAL>(aLeftBottom.getY()) );
aClipPath.CloseFigure();
// limit output to a _single_ strip of the gradient (have to
// clip here, since GDI+ wrapmode clamp does not work here)
if( Gdiplus::Ok != rGraphics->SetClip( &aClipPath,
Gdiplus::CombineModeIntersect ) )
{
return false;
}
// now, finally, output the gradient
Gdiplus::Matrix aMatrix;
tools::gdiPlusMatrixFromAffineMatrix2D( aMatrix,
texture.AffineTransform );
aBrush.SetTransform( &aMatrix );
rGraphics->FillRectangle( &aBrush, aBounds );
return true;
}
int numColorSteps( const Gdiplus::Color& rColor1, const Gdiplus::Color& rColor2 )
{
return std::max(
labs( rColor1.GetRed() - rColor2.GetRed() ),
std::max(
labs( rColor1.GetGreen() - rColor2.GetGreen() ),
labs( rColor1.GetBlue() - rColor2.GetBlue() ) ) );
}
bool fillPolygonalGradient( const ::canvas::ParametricPolyPolygon::Values& rValues,
const std::vector< Gdiplus::Color >& rColors,
const std::vector< Gdiplus::REAL >& rStops,
GraphicsSharedPtr const & rGraphics,
const GraphicsPathSharedPtr& rPath,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState,
const rendering::Texture& texture )
{
// copy original fill path object, might have to change it
// below
GraphicsPathSharedPtr pFillPath( rPath );
const ::basegfx::B2DPolygon& rGradientPoly( rValues.maGradientPoly );
PathGradientBrushSharedPtr pGradientBrush;
// fill background uniformly with end color
Gdiplus::SolidBrush aBackgroundBrush( rColors[0] );
rGraphics->FillPath( &aBackgroundBrush, pFillPath.get() );
Gdiplus::Matrix aMatrix;
// scale focus according to aspect ratio: for wider-than-tall
// bounds (nAspectRatio > 1.0), the focus must have non-zero
// width. Specifically, a bound rect twice as wide as tall has
// a focus of half its width.
if( !::rtl::math::approxEqual(rValues.mnAspectRatio,
1.0) )
{
// KLUDGE 1:
// And here comes the greatest shortcoming of the GDI+
// gradients ever: SetFocusScales completely ignores
// transformations, both when set at the PathGradientBrush
// and for the world coordinate system. Thus, to correctly
// display anisotrophic path gradients, we have to render
// them by hand. WTF.
// TODO(F2): This does not yet support other repeat modes
// except clamp, and probably also no multi-texturing
// limit output to to-be-filled polygon
if( Gdiplus::Ok != rGraphics->SetClip( pFillPath.get(),
Gdiplus::CombineModeIntersect ) )
{
return false;
}
// disable anti-aliasing, if any
const Gdiplus::SmoothingMode eOldAAMode( rGraphics->GetSmoothingMode() );
rGraphics->SetSmoothingMode( Gdiplus::SmoothingModeHighSpeed );
// determine number of steps to use
// TODO(Q2): Unify step calculations with VCL canvas
int nColorSteps = 0;
for( size_t i=0; i<rColors.size()-1; ++i )
nColorSteps += numColorSteps(rColors[i],rColors[i+1]);
::basegfx::B2DHomMatrix aTotalTransform;
const int nStepCount=
::canvas::tools::calcGradientStepCount(aTotalTransform,
viewState,
renderState,
texture,
nColorSteps);
::basegfx::B2DHomMatrix aTextureTransform;
::basegfx::unotools::homMatrixFromAffineMatrix( aTextureTransform,
texture.AffineTransform );
// determine overall transformation for inner polygon (might
// have to be prefixed by anisotrophic scaling)
::basegfx::B2DHomMatrix aInnerPolygonTransformMatrix;
// For performance reasons, we create a temporary VCL polygon
// here, keep it all the way and only change the vertex values
// in the loop below (as ::Polygon is a pimpl class, creating
// one every loop turn would really stress the mem allocator)
::basegfx::B2DPolygon aOuterPoly( rGradientPoly );
::basegfx::B2DPolygon aInnerPoly;
// subdivide polygon _before_ rendering, would otherwise have
// to be performed on every loop turn.
if( aOuterPoly.areControlPointsUsed() )
aOuterPoly = ::basegfx::utils::adaptiveSubdivideByAngle(aOuterPoly);
aInnerPoly = aOuterPoly;
aOuterPoly.transform(aTextureTransform);
// apply scaling (possibly anisotrophic) to inner polygon
// scale inner polygon according to aspect ratio: for
// wider-than-tall bounds (nAspectRatio > 1.0), the inner
// polygon, representing the gradient focus, must have
// non-zero width. Specifically, a bound rect twice as wide as
// tall has a focus polygon of half its width.
const double nAspectRatio( rValues.mnAspectRatio );
if( nAspectRatio > 1.0 )
{
// width > height case
aInnerPolygonTransformMatrix.scale( 1.0 - 1.0/nAspectRatio,
0.0 );
}
else if( nAspectRatio < 1.0 )
{
// width < height case
aInnerPolygonTransformMatrix.scale( 0.0,
1.0 - nAspectRatio );
}
else
{
// isotrophic case
aInnerPolygonTransformMatrix.scale( 0.0, 0.0 );
}
// and finally, add texture transform to it.
aInnerPolygonTransformMatrix *= aTextureTransform;
// apply final matrix to polygon
aInnerPoly.transform( aInnerPolygonTransformMatrix );
Gdiplus::GraphicsPath aCurrPath;
Gdiplus::SolidBrush aFillBrush( rColors[0] );
const sal_uInt32 nNumPoints( aOuterPoly.count() );
basegfx::utils::KeyStopLerp aLerper(rValues.maStops);
for( int i=1; i<nStepCount; ++i )
{
std::ptrdiff_t nIndex;
double fAlpha;
const double fT( i/double(nStepCount) );
std::tie(nIndex,fAlpha)=aLerper.lerp(fT);
const Gdiplus::Color aFillColor(
static_cast<BYTE>( basegfx::utils::lerp(rColors[nIndex].GetRed(),rColors[nIndex+1].GetRed(),fAlpha) ),
static_cast<BYTE>( basegfx::utils::lerp(rColors[nIndex].GetGreen(),rColors[nIndex+1].GetGreen(),fAlpha) ),
static_cast<BYTE>( basegfx::utils::lerp(rColors[nIndex].GetBlue(),rColors[nIndex+1].GetBlue(),fAlpha) ) );
aFillBrush.SetColor( aFillColor );
aCurrPath.Reset(); aCurrPath.StartFigure();
for( unsigned int p=1; p<nNumPoints; ++p )
{
const ::basegfx::B2DPoint& rOuterPoint1( aOuterPoly.getB2DPoint(p-1) );
const ::basegfx::B2DPoint& rInnerPoint1( aInnerPoly.getB2DPoint(p-1) );
const ::basegfx::B2DPoint& rOuterPoint2( aOuterPoly.getB2DPoint(p) );
const ::basegfx::B2DPoint& rInnerPoint2( aInnerPoly.getB2DPoint(p) );
aCurrPath.AddLine(
Gdiplus::REAL(fT*rInnerPoint1.getX() + (1-fT)*rOuterPoint1.getX()),
Gdiplus::REAL(fT*rInnerPoint1.getY() + (1-fT)*rOuterPoint1.getY()),
Gdiplus::REAL(fT*rInnerPoint2.getX() + (1-fT)*rOuterPoint2.getX()),
Gdiplus::REAL(fT*rInnerPoint2.getY() + (1-fT)*rOuterPoint2.getY()));
}
aCurrPath.CloseFigure();
rGraphics->FillPath( &aFillBrush, &aCurrPath );
}
// reset to old anti-alias mode
rGraphics->SetSmoothingMode( eOldAAMode );
}
else
{
// KLUDGE 2:
// We're generating a PathGradientBrush from scratch here,
// and put in a transformed GraphicsPath (transformed with
// the texture transform). This is because the
// straight-forward approach to store a Brush pointer at
// this class and set a texture transform via
// PathGradientBrush::SetTransform() is spoiled by MS: it
// seems that _either_ the texture transform, _or_ the
// transform at the Graphics can be set, but not both. If
// one sets both, only the translational components of the
// texture is respected.
tools::gdiPlusMatrixFromAffineMatrix2D( aMatrix,
texture.AffineTransform );
GraphicsPathSharedPtr pGradientPath(
tools::graphicsPathFromB2DPolygon( rValues.maGradientPoly ));
pGradientPath->Transform( &aMatrix );
pGradientBrush.reset(
new Gdiplus::PathGradientBrush( pGradientPath.get() ) );
pGradientBrush->SetInterpolationColors( &rColors[0],
&rStops[0],
rStops.size() );
// explicitly setup center point. Since the center of GDI+
// gradients are by default the _centroid_ of the path
// (i.e. the weighted sum of edge points), it will not
// necessarily coincide with our notion of center.
Gdiplus::PointF aCenterPoint(0, 0);
aMatrix.TransformPoints( &aCenterPoint );
pGradientBrush->SetCenterPoint( aCenterPoint );
const bool bTileX( texture.RepeatModeX != rendering::TexturingMode::CLAMP );
const bool bTileY( texture.RepeatModeY != rendering::TexturingMode::CLAMP );
if( bTileX && bTileY )
pGradientBrush->SetWrapMode( Gdiplus::WrapModeTile );
else
{
OSL_ENSURE( bTileY == bTileX,
"ParametricPolyPolygon::fillPolygonalGradient(): Cannot have repeat x and repeat y differ!" );
pGradientBrush->SetWrapMode( Gdiplus::WrapModeClamp );
}
// render actual gradient
rGraphics->FillPath( pGradientBrush.get(), pFillPath.get() );
}
#if OSL_DEBUG_LEVEL > 0
Gdiplus::Pen aPen( Gdiplus::Color( 255, 255, 0, 0 ),
0.0001f );
rGraphics->DrawRectangle( &aPen,
Gdiplus::RectF( 0.0f, 0.0f,
1.0f, 1.0f ) );
#endif
return true;
}
bool fillGradient( const ::canvas::ParametricPolyPolygon::Values& rValues,
const std::vector< Gdiplus::Color >& rColors,
const std::vector< Gdiplus::REAL >& rStops,
GraphicsSharedPtr const & rGraphics,
const GraphicsPathSharedPtr& rPath,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState,
const rendering::Texture& texture )
{
switch( rValues.meType )
{
case ::canvas::ParametricPolyPolygon::GradientType::Linear:
fillLinearGradient( rGraphics,
rValues,
rColors,
rStops,
rPath,
texture );
break;
case ::canvas::ParametricPolyPolygon::GradientType::Elliptical:
// FALLTHROUGH intended
case ::canvas::ParametricPolyPolygon::GradientType::Rectangular:
fillPolygonalGradient( rValues,
rColors,
rStops,
rGraphics,
rPath,
viewState,
renderState,
texture );
break;
default:
ENSURE_OR_THROW( false,
"CanvasHelper::fillGradient(): Unexpected case" );
}
return true;
}
void fillBitmap( const uno::Reference< rendering::XBitmap >& xBitmap,
GraphicsSharedPtr const & rGraphics,
const GraphicsPathSharedPtr& rPath,
const rendering::Texture& rTexture )
{
OSL_ENSURE( rTexture.RepeatModeX ==
rTexture.RepeatModeY,
"CanvasHelper::fillBitmap(): GDI+ cannot handle differing X/Y repeat mode." );
const bool bClamp( rTexture.RepeatModeX == rendering::TexturingMode::NONE &&
rTexture.RepeatModeY == rendering::TexturingMode::NONE );
const geometry::IntegerSize2D aBmpSize( xBitmap->getSize() );
ENSURE_ARG_OR_THROW( aBmpSize.Width != 0 &&
aBmpSize.Height != 0,
"CanvasHelper::fillBitmap(): zero-sized texture bitmap" );
// TODO(P3): Detect case that path is rectangle and
// bitmap is just scaled into that. Then, we can
// render directly, without generating a temporary
// GDI+ bitmap (this is significant, because drawing
// layer presents background object bitmap in that
// way!)
BitmapSharedPtr pBitmap(
tools::bitmapFromXBitmap( xBitmap ) );
TextureBrushSharedPtr pBrush;
if( ::rtl::math::approxEqual( rTexture.Alpha,
1.0 ) )
{
pBrush.reset(
new Gdiplus::TextureBrush(
pBitmap.get(),
bClamp ? Gdiplus::WrapModeClamp : Gdiplus::WrapModeTile ) );
}
else
{
Gdiplus::ImageAttributes aImgAttr;
tools::setModulateImageAttributes( aImgAttr,
1.0,
1.0,
1.0,
rTexture.Alpha );
Gdiplus::Rect aRect(0,0,
aBmpSize.Width,
aBmpSize.Height);
pBrush.reset(
new Gdiplus::TextureBrush(
pBitmap.get(),
aRect,
&aImgAttr ) );
pBrush->SetWrapMode(
bClamp ? Gdiplus::WrapModeClamp : Gdiplus::WrapModeTile );
}
Gdiplus::Matrix aTextureTransform;
tools::gdiPlusMatrixFromAffineMatrix2D( aTextureTransform,
rTexture.AffineTransform );
// scale down bitmap to [0,1]x[0,1] rect, as required
// from the XCanvas interface.
pBrush->MultiplyTransform( &aTextureTransform );
pBrush->ScaleTransform( static_cast< Gdiplus::REAL >(1.0/aBmpSize.Width),
static_cast< Gdiplus::REAL >(1.0/aBmpSize.Height) );
// TODO(F1): FillRule
ENSURE_OR_THROW(
Gdiplus::Ok == rGraphics->FillPath( pBrush.get(),
rPath.get() ),
"CanvasHelper::fillTexturedPolyPolygon(): GDI+ call failed" );
}
}
uno::Reference< rendering::XCachedPrimitive > CanvasHelper::fillTexturedPolyPolygon( const rendering::XCanvas* /*pCanvas*/,
const uno::Reference< rendering::XPolyPolygon2D >& xPolyPolygon,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState,
const uno::Sequence< rendering::Texture >& textures )
{
ENSURE_OR_THROW( xPolyPolygon.is(),
"CanvasHelper::fillTexturedPolyPolygon: polygon is NULL");
ENSURE_OR_THROW( textures.getLength(),
"CanvasHelper::fillTexturedPolyPolygon: empty texture sequence");
if( needOutput() )
{
GraphicsSharedPtr pGraphics( mpGraphicsProvider->getGraphics() );
setupGraphicsState( pGraphics, viewState, renderState );
// TODO(F1): Multi-texturing
if( textures[0].Gradient.is() )
{
// try to cast XParametricPolyPolygon2D reference to
// our implementation class.
::canvas::ParametricPolyPolygon* pGradient =
dynamic_cast< ::canvas::ParametricPolyPolygon* >( textures[0].Gradient.get() );
if( pGradient )
{
const ::canvas::ParametricPolyPolygon::Values& rValues(
pGradient->getValues() );
OSL_ASSERT(rValues.maColors.getLength() == rValues.maStops.getLength()
&& rValues.maColors.getLength() > 1);
std::vector< Gdiplus::Color > aColors(rValues.maColors.getLength());
std::transform(&rValues.maColors[0],
&rValues.maColors[0]+rValues.maColors.getLength(),
aColors.begin(),
[](const uno::Sequence< double >& aDoubleSequence) { return tools::sequenceToArgb(aDoubleSequence); } );
std::vector< Gdiplus::REAL > aStops;
comphelper::sequenceToContainer(aStops,rValues.maStops);
// TODO(E1): Return value
// TODO(F1): FillRule
fillGradient( rValues,
aColors,
aStops,
pGraphics,
tools::graphicsPathFromXPolyPolygon2D( xPolyPolygon ),
viewState,
renderState,
textures[0] );
}
}
else if( textures[0].Bitmap.is() )
{
// TODO(E1): Return value
// TODO(F1): FillRule
fillBitmap( textures[0].Bitmap,
pGraphics,
tools::graphicsPathFromXPolyPolygon2D( xPolyPolygon ),
textures[0] );
}
}
// TODO(P1): Provide caching here.
return uno::Reference< rendering::XCachedPrimitive >(nullptr);
}
}
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