diff options
Diffstat (limited to '')
| -rw-r--r-- | vcl/source/outdev/gradient.cxx | 631 |
1 files changed, 631 insertions, 0 deletions
diff --git a/vcl/source/outdev/gradient.cxx b/vcl/source/outdev/gradient.cxx new file mode 100644 index 000000000..eb2fd4645 --- /dev/null +++ b/vcl/source/outdev/gradient.cxx @@ -0,0 +1,631 @@ +/* -*- 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 <memory> +#include <cassert> + +#include <tools/poly.hxx> +#include <vcl/gdimtf.hxx> +#include <vcl/gradient.hxx> +#include <vcl/metaact.hxx> +#include <vcl/settings.hxx> +#include <vcl/outdev.hxx> +#include <vcl/virdev.hxx> +#include <vcl/window.hxx> + +#include <salgdi.hxx> + +#define GRADIENT_DEFAULT_STEPCOUNT 0 + +void OutputDevice::DrawGradient( const tools::Rectangle& rRect, + const Gradient& rGradient ) +{ + assert(!is_double_buffered_window()); + + // Convert rectangle to a tools::PolyPolygon by first converting to a Polygon + tools::Polygon aPolygon ( rRect ); + tools::PolyPolygon aPolyPoly ( aPolygon ); + + DrawGradient ( aPolyPoly, rGradient ); +} + +void OutputDevice::DrawGradient( const tools::PolyPolygon& rPolyPoly, + const Gradient& rGradient ) +{ + assert(!is_double_buffered_window()); + + if (mbInitClipRegion) + InitClipRegion(); + // don't return on mbOutputClipped here, as we may need to draw the clipped metafile, even if the output is clipped + + if ( rPolyPoly.Count() && rPolyPoly[ 0 ].GetSize() ) + { + if ( mnDrawMode & ( DrawModeFlags::BlackGradient | DrawModeFlags::WhiteGradient | DrawModeFlags::SettingsGradient) ) + { + Color aColor = GetSingleColorGradientFill(); + + Push( vcl::PushFlags::LINECOLOR | vcl::PushFlags::FILLCOLOR ); + SetLineColor( aColor ); + SetFillColor( aColor ); + DrawPolyPolygon( rPolyPoly ); + Pop(); + return; + } + + Gradient aGradient( rGradient ); + + if ( mnDrawMode & DrawModeFlags::GrayGradient ) + aGradient.MakeGrayscale(); + + DrawGradientToMetafile( rPolyPoly, rGradient ); + + if( !IsDeviceOutputNecessary() || ImplIsRecordLayout() ) + return; + + // Clip and then draw the gradient + if( !tools::Rectangle( PixelToLogic( Point() ), GetOutputSize() ).IsEmpty() ) + { + const tools::Rectangle aBoundRect( rPolyPoly.GetBoundRect() ); + + // convert rectangle to pixels + tools::Rectangle aRect( ImplLogicToDevicePixel( aBoundRect ) ); + aRect.Justify(); + + // do nothing if the rectangle is empty + if ( !aRect.IsEmpty() ) + { + tools::PolyPolygon aClixPolyPoly( ImplLogicToDevicePixel( rPolyPoly ) ); + bool bDrawn = false; + + if( !mpGraphics && !AcquireGraphics() ) + return; + + // secure clip region + Push( vcl::PushFlags::CLIPREGION ); + IntersectClipRegion( aBoundRect ); + + if (mbInitClipRegion) + InitClipRegion(); + + // try to draw gradient natively + if (!mbOutputClipped) + bDrawn = mpGraphics->DrawGradient( aClixPolyPoly, aGradient, *this ); + + if (!bDrawn && !mbOutputClipped) + { + // draw gradients without border + if( mbLineColor || mbInitLineColor ) + { + mpGraphics->SetLineColor(); + mbInitLineColor = true; + } + + mbInitFillColor = true; + + // calculate step count if necessary + if ( !aGradient.GetSteps() ) + aGradient.SetSteps( GRADIENT_DEFAULT_STEPCOUNT ); + + if ( rPolyPoly.IsRect() ) + { + // because we draw with no border line, we have to expand gradient + // rect to avoid missing lines on the right and bottom edge + aRect.AdjustLeft( -1 ); + aRect.AdjustTop( -1 ); + aRect.AdjustRight( 1 ); + aRect.AdjustBottom( 1 ); + } + + // if the clipping polypolygon is a rectangle, then it's the same size as the bounding of the + // polypolygon, so pass in a NULL for the clipping parameter + if( aGradient.GetStyle() == GradientStyle::Linear || rGradient.GetStyle() == GradientStyle::Axial ) + DrawLinearGradient( aRect, aGradient, aClixPolyPoly.IsRect() ? nullptr : &aClixPolyPoly ); + else + DrawComplexGradient( aRect, aGradient, aClixPolyPoly.IsRect() ? nullptr : &aClixPolyPoly ); + } + + Pop(); + } + } + } + + if( mpAlphaVDev ) + { + const Color aFillCol( mpAlphaVDev->GetFillColor() ); + mpAlphaVDev->SetFillColor( COL_BLACK ); + mpAlphaVDev->DrawPolyPolygon( rPolyPoly ); + mpAlphaVDev->SetFillColor( aFillCol ); + } +} + +void OutputDevice::ClipAndDrawGradientMetafile ( const Gradient &rGradient, const tools::PolyPolygon &rPolyPoly ) +{ + const tools::Rectangle aBoundRect( rPolyPoly.GetBoundRect() ); + const bool bOldOutput = IsOutputEnabled(); + + EnableOutput( false ); + Push( vcl::PushFlags::RASTEROP ); + SetRasterOp( RasterOp::Xor ); + DrawGradient( aBoundRect, rGradient ); + SetFillColor( COL_BLACK ); + SetRasterOp( RasterOp::N0 ); + DrawPolyPolygon( rPolyPoly ); + SetRasterOp( RasterOp::Xor ); + DrawGradient( aBoundRect, rGradient ); + Pop(); + EnableOutput( bOldOutput ); +} + +void OutputDevice::DrawGradientToMetafile ( const tools::PolyPolygon& rPolyPoly, + const Gradient& rGradient ) +{ + assert(!is_double_buffered_window()); + + if ( !mpMetaFile ) + return; + + if ( !(rPolyPoly.Count() && rPolyPoly[ 0 ].GetSize()) ) + return; + + const tools::Rectangle aBoundRect( rPolyPoly.GetBoundRect() ); + + if (aBoundRect.IsEmpty()) + return; + + Gradient aGradient( rGradient ); + + if (mnDrawMode & DrawModeFlags::GrayGradient) + aGradient.MakeGrayscale(); + + if ( rPolyPoly.IsRect() ) + { + mpMetaFile->AddAction( new MetaGradientAction( aBoundRect, aGradient ) ); + } + else + { + mpMetaFile->AddAction( new MetaCommentAction( "XGRAD_SEQ_BEGIN" ) ); + mpMetaFile->AddAction( new MetaGradientExAction( rPolyPoly, rGradient ) ); + + ClipAndDrawGradientMetafile ( rGradient, rPolyPoly ); + + mpMetaFile->AddAction( new MetaCommentAction( "XGRAD_SEQ_END" ) ); + } +} + +namespace +{ + sal_uInt8 GetGradientColorValue( tools::Long nValue ) + { + if ( nValue < 0 ) + return 0; + else if ( nValue > 0xFF ) + return 0xFF; + else + return static_cast<sal_uInt8>(nValue); + } +} + +void OutputDevice::DrawLinearGradient( const tools::Rectangle& rRect, + const Gradient& rGradient, + const tools::PolyPolygon* pClixPolyPoly ) +{ + assert(!is_double_buffered_window()); + + // get BoundRect of rotated rectangle + tools::Rectangle aRect; + Point aCenter; + Degree10 nAngle = rGradient.GetAngle() % 3600_deg10; + + rGradient.GetBoundRect( rRect, aRect, aCenter ); + + bool bLinear = (rGradient.GetStyle() == GradientStyle::Linear); + double fBorder = rGradient.GetBorder() * aRect.GetHeight() / 100.0; + if ( !bLinear ) + { + fBorder /= 2.0; + } + tools::Rectangle aMirrorRect = aRect; // used in style axial + aMirrorRect.SetTop( ( aRect.Top() + aRect.Bottom() ) / 2 ); + if ( !bLinear ) + { + aRect.SetBottom( aMirrorRect.Top() ); + } + + // colour-intensities of start- and finish; change if needed + tools::Long nFactor; + Color aStartCol = rGradient.GetStartColor(); + Color aEndCol = rGradient.GetEndColor(); + tools::Long nStartRed = aStartCol.GetRed(); + tools::Long nStartGreen = aStartCol.GetGreen(); + tools::Long nStartBlue = aStartCol.GetBlue(); + tools::Long nEndRed = aEndCol.GetRed(); + tools::Long nEndGreen = aEndCol.GetGreen(); + tools::Long nEndBlue = aEndCol.GetBlue(); + nFactor = rGradient.GetStartIntensity(); + nStartRed = (nStartRed * nFactor) / 100; + nStartGreen = (nStartGreen * nFactor) / 100; + nStartBlue = (nStartBlue * nFactor) / 100; + nFactor = rGradient.GetEndIntensity(); + nEndRed = (nEndRed * nFactor) / 100; + nEndGreen = (nEndGreen * nFactor) / 100; + nEndBlue = (nEndBlue * nFactor) / 100; + + // gradient style axial has exchanged start and end colors + if ( !bLinear) + { + tools::Long nTempColor = nStartRed; + nStartRed = nEndRed; + nEndRed = nTempColor; + nTempColor = nStartGreen; + nStartGreen = nEndGreen; + nEndGreen = nTempColor; + nTempColor = nStartBlue; + nStartBlue = nEndBlue; + nEndBlue = nTempColor; + } + + sal_uInt8 nRed; + sal_uInt8 nGreen; + sal_uInt8 nBlue; + + // Create border + tools::Rectangle aBorderRect = aRect; + tools::Polygon aPoly( 4 ); + if (fBorder > 0.0) + { + nRed = static_cast<sal_uInt8>(nStartRed); + nGreen = static_cast<sal_uInt8>(nStartGreen); + nBlue = static_cast<sal_uInt8>(nStartBlue); + + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + + aBorderRect.SetBottom( static_cast<tools::Long>( aBorderRect.Top() + fBorder ) ); + aRect.SetTop( aBorderRect.Bottom() ); + aPoly[0] = aBorderRect.TopLeft(); + aPoly[1] = aBorderRect.TopRight(); + aPoly[2] = aBorderRect.BottomRight(); + aPoly[3] = aBorderRect.BottomLeft(); + aPoly.Rotate( aCenter, nAngle ); + + ImplDrawPolygon( aPoly, pClixPolyPoly ); + + if ( !bLinear) + { + aBorderRect = aMirrorRect; + aBorderRect.SetTop( static_cast<tools::Long>( aBorderRect.Bottom() - fBorder ) ); + aMirrorRect.SetBottom( aBorderRect.Top() ); + aPoly[0] = aBorderRect.TopLeft(); + aPoly[1] = aBorderRect.TopRight(); + aPoly[2] = aBorderRect.BottomRight(); + aPoly[3] = aBorderRect.BottomLeft(); + aPoly.Rotate( aCenter, nAngle ); + + ImplDrawPolygon( aPoly, pClixPolyPoly ); + } + } + + // calculate step count + tools::Long nStepCount = GetGradientSteps(rGradient, aRect); + + // minimal three steps and maximal as max color steps + tools::Long nAbsRedSteps = std::abs( nEndRed - nStartRed ); + tools::Long nAbsGreenSteps = std::abs( nEndGreen - nStartGreen ); + tools::Long nAbsBlueSteps = std::abs( nEndBlue - nStartBlue ); + tools::Long nMaxColorSteps = std::max( nAbsRedSteps , nAbsGreenSteps ); + nMaxColorSteps = std::max( nMaxColorSteps, nAbsBlueSteps ); + tools::Long nSteps = std::min( nStepCount, nMaxColorSteps ); + if ( nSteps < 3) + { + nSteps = 3; + } + + double fScanInc = static_cast<double>(aRect.GetHeight()) / static_cast<double>(nSteps); + double fGradientLine = static_cast<double>(aRect.Top()); + double fMirrorGradientLine = static_cast<double>(aMirrorRect.Bottom()); + + const double fStepsMinus1 = static_cast<double>(nSteps) - 1.0; + if ( !bLinear) + { + nSteps -= 1; // draw middle polygons as one polygon after loop to avoid gap + } + + for ( tools::Long i = 0; i < nSteps; i++ ) + { + // linear interpolation of color + const double fAlpha = static_cast<double>(i) / fStepsMinus1; + double fTempColor = static_cast<double>(nStartRed) * (1.0-fAlpha) + static_cast<double>(nEndRed) * fAlpha; + nRed = GetGradientColorValue(static_cast<tools::Long>(fTempColor)); + fTempColor = static_cast<double>(nStartGreen) * (1.0-fAlpha) + static_cast<double>(nEndGreen) * fAlpha; + nGreen = GetGradientColorValue(static_cast<tools::Long>(fTempColor)); + fTempColor = static_cast<double>(nStartBlue) * (1.0-fAlpha) + static_cast<double>(nEndBlue) * fAlpha; + nBlue = GetGradientColorValue(static_cast<tools::Long>(fTempColor)); + + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + + // Polygon for this color step + aRect.SetTop( static_cast<tools::Long>( fGradientLine + static_cast<double>(i) * fScanInc ) ); + aRect.SetBottom( static_cast<tools::Long>( fGradientLine + ( static_cast<double>(i) + 1.0 ) * fScanInc ) ); + aPoly[0] = aRect.TopLeft(); + aPoly[1] = aRect.TopRight(); + aPoly[2] = aRect.BottomRight(); + aPoly[3] = aRect.BottomLeft(); + aPoly.Rotate( aCenter, nAngle ); + + ImplDrawPolygon( aPoly, pClixPolyPoly ); + + if ( !bLinear ) + { + aMirrorRect.SetBottom( static_cast<tools::Long>( fMirrorGradientLine - static_cast<double>(i) * fScanInc ) ); + aMirrorRect.SetTop( static_cast<tools::Long>( fMirrorGradientLine - (static_cast<double>(i) + 1.0)* fScanInc ) ); + aPoly[0] = aMirrorRect.TopLeft(); + aPoly[1] = aMirrorRect.TopRight(); + aPoly[2] = aMirrorRect.BottomRight(); + aPoly[3] = aMirrorRect.BottomLeft(); + aPoly.Rotate( aCenter, nAngle ); + + ImplDrawPolygon( aPoly, pClixPolyPoly ); + } + } + if ( bLinear) + return; + + // draw middle polygon with end color + nRed = GetGradientColorValue(nEndRed); + nGreen = GetGradientColorValue(nEndGreen); + nBlue = GetGradientColorValue(nEndBlue); + + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + + aRect.SetTop( static_cast<tools::Long>( fGradientLine + static_cast<double>(nSteps) * fScanInc ) ); + aRect.SetBottom( static_cast<tools::Long>( fMirrorGradientLine - static_cast<double>(nSteps) * fScanInc ) ); + aPoly[0] = aRect.TopLeft(); + aPoly[1] = aRect.TopRight(); + aPoly[2] = aRect.BottomRight(); + aPoly[3] = aRect.BottomLeft(); + aPoly.Rotate( aCenter, nAngle ); + + ImplDrawPolygon( aPoly, pClixPolyPoly ); + +} + +bool OutputDevice::is_double_buffered_window() const +{ + auto pOwnerWindow = GetOwnerWindow(); + return pOwnerWindow && pOwnerWindow->SupportsDoubleBuffering(); +} + +void OutputDevice::DrawComplexGradient( const tools::Rectangle& rRect, + const Gradient& rGradient, + const tools::PolyPolygon* pClixPolyPoly ) +{ + assert(!is_double_buffered_window()); + + // Determine if we output via Polygon or PolyPolygon + // For all rasteroperations other than Overpaint always use PolyPolygon, + // as we will get wrong results if we output multiple times on top of each other. + // Also for printers always use PolyPolygon, as not all printers + // can print polygons on top of each other. + + std::optional<tools::PolyPolygon> xPolyPoly; + tools::Rectangle aRect; + Point aCenter; + Color aStartCol( rGradient.GetStartColor() ); + Color aEndCol( rGradient.GetEndColor() ); + tools::Long nStartRed = ( static_cast<tools::Long>(aStartCol.GetRed()) * rGradient.GetStartIntensity() ) / 100; + tools::Long nStartGreen = ( static_cast<tools::Long>(aStartCol.GetGreen()) * rGradient.GetStartIntensity() ) / 100; + tools::Long nStartBlue = ( static_cast<tools::Long>(aStartCol.GetBlue()) * rGradient.GetStartIntensity() ) / 100; + tools::Long nEndRed = ( static_cast<tools::Long>(aEndCol.GetRed()) * rGradient.GetEndIntensity() ) / 100; + tools::Long nEndGreen = ( static_cast<tools::Long>(aEndCol.GetGreen()) * rGradient.GetEndIntensity() ) / 100; + tools::Long nEndBlue = ( static_cast<tools::Long>(aEndCol.GetBlue()) * rGradient.GetEndIntensity() ) / 100; + tools::Long nRedSteps = nEndRed - nStartRed; + tools::Long nGreenSteps = nEndGreen - nStartGreen; + tools::Long nBlueSteps = nEndBlue - nStartBlue; + Degree10 nAngle = rGradient.GetAngle() % 3600_deg10; + + rGradient.GetBoundRect( rRect, aRect, aCenter ); + + if ( UsePolyPolygonForComplexGradient() ) + xPolyPoly = tools::PolyPolygon( 2 ); + + tools::Long nStepCount = GetGradientSteps(rGradient, rRect); + + // at least three steps and at most the number of colour differences + tools::Long nSteps = std::max( nStepCount, tools::Long(2) ); + tools::Long nCalcSteps = std::abs( nRedSteps ); + tools::Long nTempSteps = std::abs( nGreenSteps ); + if ( nTempSteps > nCalcSteps ) + nCalcSteps = nTempSteps; + nTempSteps = std::abs( nBlueSteps ); + if ( nTempSteps > nCalcSteps ) + nCalcSteps = nTempSteps; + if ( nCalcSteps < nSteps ) + nSteps = nCalcSteps; + if ( !nSteps ) + nSteps = 1; + + // determine output limits and stepsizes for all directions + tools::Polygon aPoly; + double fScanLeft = aRect.Left(); + double fScanTop = aRect.Top(); + double fScanRight = aRect.Right(); + double fScanBottom = aRect.Bottom(); + double fScanIncX = static_cast<double>(aRect.GetWidth()) / static_cast<double>(nSteps) * 0.5; + double fScanIncY = static_cast<double>(aRect.GetHeight()) / static_cast<double>(nSteps) * 0.5; + + // all gradients are rendered as nested rectangles which shrink + // equally in each dimension - except for 'square' gradients + // which shrink to a central vertex but are not per-se square. + if( rGradient.GetStyle() != GradientStyle::Square ) + { + fScanIncY = std::min( fScanIncY, fScanIncX ); + fScanIncX = fScanIncY; + } + sal_uInt8 nRed = static_cast<sal_uInt8>(nStartRed), nGreen = static_cast<sal_uInt8>(nStartGreen), nBlue = static_cast<sal_uInt8>(nStartBlue); + bool bPaintLastPolygon( false ); // #107349# Paint last polygon only if loop has generated any output + + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + + if( xPolyPoly ) + { + aPoly = rRect; + xPolyPoly->Insert( aPoly ); + xPolyPoly->Insert( aPoly ); + } + else + { + // extend rect, to avoid missing bounding line + tools::Rectangle aExtRect( rRect ); + + aExtRect.AdjustLeft( -1 ); + aExtRect.AdjustTop( -1 ); + aExtRect.AdjustRight(1 ); + aExtRect.AdjustBottom(1 ); + + aPoly = aExtRect; + ImplDrawPolygon( aPoly, pClixPolyPoly ); + } + + // loop to output Polygon/PolyPolygon sequentially + for( tools::Long i = 1; i < nSteps; i++ ) + { + // calculate new Polygon + fScanLeft += fScanIncX; + aRect.SetLeft( static_cast<tools::Long>( fScanLeft ) ); + fScanTop += fScanIncY; + aRect.SetTop( static_cast<tools::Long>( fScanTop ) ); + fScanRight -= fScanIncX; + aRect.SetRight( static_cast<tools::Long>( fScanRight ) ); + fScanBottom -= fScanIncY; + aRect.SetBottom( static_cast<tools::Long>( fScanBottom ) ); + + if( ( aRect.GetWidth() < 2 ) || ( aRect.GetHeight() < 2 ) ) + break; + + if( rGradient.GetStyle() == GradientStyle::Radial || rGradient.GetStyle() == GradientStyle::Elliptical ) + aPoly = tools::Polygon( aRect.Center(), aRect.GetWidth() >> 1, aRect.GetHeight() >> 1 ); + else + aPoly = tools::Polygon( aRect ); + + aPoly.Rotate( aCenter, nAngle ); + + // adapt colour accordingly + const tools::Long nStepIndex = ( xPolyPoly ? i : ( i + 1 ) ); + nRed = GetGradientColorValue( nStartRed + ( ( nRedSteps * nStepIndex ) / nSteps ) ); + nGreen = GetGradientColorValue( nStartGreen + ( ( nGreenSteps * nStepIndex ) / nSteps ) ); + nBlue = GetGradientColorValue( nStartBlue + ( ( nBlueSteps * nStepIndex ) / nSteps ) ); + + // either slow tools::PolyPolygon output or fast Polygon-Painting + if( xPolyPoly ) + { + bPaintLastPolygon = true; // #107349# Paint last polygon only if loop has generated any output + + xPolyPoly->Replace( xPolyPoly->GetObject( 1 ), 0 ); + xPolyPoly->Replace( aPoly, 1 ); + + ImplDrawPolyPolygon( *xPolyPoly, pClixPolyPoly ); + + // #107349# Set fill color _after_ geometry painting: + // xPolyPoly's geometry is the band from last iteration's + // aPoly to current iteration's aPoly. The window outdev + // path (see else below), on the other hand, paints the + // full aPoly. Thus, here, we're painting the band before + // the one painted in the window outdev path below. To get + // matching colors, have to delay color setting here. + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + } + else + { + // #107349# Set fill color _before_ geometry painting + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + + ImplDrawPolygon( aPoly, pClixPolyPoly ); + } + } + + // we should draw last inner Polygon if we output PolyPolygon + if( !xPolyPoly ) + return; + + const tools::Polygon& rPoly = xPolyPoly->GetObject( 1 ); + + if( rPoly.GetBoundRect().IsEmpty() ) + return; + + // #107349# Paint last polygon with end color only if loop + // has generated output. Otherwise, the current + // (i.e. start) color is taken, to generate _any_ output. + if( bPaintLastPolygon ) + { + nRed = GetGradientColorValue( nEndRed ); + nGreen = GetGradientColorValue( nEndGreen ); + nBlue = GetGradientColorValue( nEndBlue ); + } + + mpGraphics->SetFillColor( Color( nRed, nGreen, nBlue ) ); + ImplDrawPolygon( rPoly, pClixPolyPoly ); +} + +tools::Long OutputDevice::GetGradientStepCount( tools::Long nMinRect ) +{ + tools::Long nInc = (nMinRect < 50) ? 2 : 4; + + return nInc; +} + +tools::Long OutputDevice::GetGradientSteps(Gradient const& rGradient, tools::Rectangle const& rRect) +{ + // calculate step count + tools::Long nStepCount = rGradient.GetSteps(); + + if (nStepCount) + return nStepCount; + + tools::Long nMinRect = 0; + + if (rGradient.GetStyle() == GradientStyle::Linear || rGradient.GetStyle() == GradientStyle::Axial) + nMinRect = rRect.GetHeight(); + else + nMinRect = std::min(rRect.GetWidth(), rRect.GetHeight()); + + tools::Long nInc = GetGradientStepCount(nMinRect); + + if (!nInc) + nInc = 1; + + return nMinRect / nInc; +} + +Color OutputDevice::GetSingleColorGradientFill() +{ + Color aColor; + + // we should never call on this function if any of these aren't set! + assert( mnDrawMode & ( DrawModeFlags::BlackGradient | DrawModeFlags::WhiteGradient | DrawModeFlags::SettingsGradient) ); + + if ( mnDrawMode & DrawModeFlags::BlackGradient ) + aColor = COL_BLACK; + else if ( mnDrawMode & DrawModeFlags::WhiteGradient ) + aColor = COL_WHITE; + else if ( mnDrawMode & DrawModeFlags::SettingsGradient ) + aColor = GetSettings().GetStyleSettings().GetWindowColor(); + + return aColor; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |