tdf#37636 Render textlines with colors.

Create a new helepr class, TextLinesHelper, to handle
textline colors and overall size.

Change-Id: I8635199819443429f7be1754a298e9a21ef17f8c
Reviewed-on: https://gerrit.libreoffice.org/62832
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>

4 files changed, 235 insertions, 36 deletions

diff --git a/cppcanvas/Library_cppcanvas.mk b/cppcanvas/Library_cppcanvas.mk
index 4033442f0a11..8a374b58dcee 100644
--- a/cppcanvas/Library_cppcanvas.mk
+++ b/cppcanvas/Library_cppcanvas.mk
@@ -65,6 +65,7 @@ $(eval $(call gb_Library_add_exception_objects,cppcanvas,\
 	cppcanvas/source/mtfrenderer/polypolyaction \
 	cppcanvas/source/mtfrenderer/emfpstringformat \
 	cppcanvas/source/mtfrenderer/textaction \
+	cppcanvas/source/mtfrenderer/textlineshelper \
 	cppcanvas/source/mtfrenderer/transparencygroupaction \
 	cppcanvas/source/tools/canvasgraphichelper \
 	cppcanvas/source/tools/tools \
diff --git a/cppcanvas/source/mtfrenderer/textaction.cxx b/cppcanvas/source/mtfrenderer/textaction.cxx
index b43f691e931b..422a92279659 100644
--- a/cppcanvas/source/mtfrenderer/textaction.cxx
+++ b/cppcanvas/source/mtfrenderer/textaction.cxx
@@ -43,6 +43,7 @@
 #include <sal/log.hxx>
 
 #include "textaction.hxx"
+#include "textlineshelper.hxx"
 #include <outdevstate.hxx>
 #include "mtftools.hxx"
 
@@ -1261,8 +1262,7 @@ namespace cppcanvas
                 const CanvasSharedPtr                           mpCanvas;
                 rendering::RenderState                          maState;
                 const tools::TextLineInfo                       maTextLineInfo;
-                ::basegfx::B2DSize                              maLinesOverallSize;
-                uno::Reference< rendering::XPolyPolygon2D >     mxTextLines;
+                TextLinesHelper                                 maTextLinesHelper;
                 const ::basegfx::B2DSize                        maReliefOffset;
                 const ::Color                                   maReliefColor;
                 const ::basegfx::B2DSize                        maShadowOffset;
@@ -1288,8 +1288,7 @@ namespace cppcanvas
                 mpCanvas( rCanvas ),
                 maState(),
                 maTextLineInfo( tools::createTextLineInfo( rVDev, rState ) ),
-                maLinesOverallSize(),
-                mxTextLines(),
+                maTextLinesHelper(mpCanvas, rState),
                 maReliefOffset( rReliefOffset ),
                 maReliefColor( rReliefColor ),
                 maShadowOffset( rShadowOffset ),
@@ -1298,11 +1297,7 @@ namespace cppcanvas
             {
                 initLayoutWidth(mnLayoutWidth, rOffsets);
 
-                initEffectLinePolyPolygon( maLinesOverallSize,
-                                           mxTextLines,
-                                           rCanvas,
-                                           mnLayoutWidth,
-                                           maTextLineInfo );
+                maTextLinesHelper.init(mnLayoutWidth, maTextLineInfo);
 
                 initArrayAction( maState,
                                  mxTextLayout,
@@ -1333,8 +1328,7 @@ namespace cppcanvas
                 mpCanvas( rCanvas ),
                 maState(),
                 maTextLineInfo( tools::createTextLineInfo( rVDev, rState ) ),
-                maLinesOverallSize(),
-                mxTextLines(),
+                maTextLinesHelper(mpCanvas, rState),
                 maReliefOffset( rReliefOffset ),
                 maReliefColor( rReliefColor ),
                 maShadowOffset( rShadowOffset ),
@@ -1343,11 +1337,7 @@ namespace cppcanvas
             {
                 initLayoutWidth(mnLayoutWidth, rOffsets);
 
-                initEffectLinePolyPolygon( maLinesOverallSize,
-                                           mxTextLines,
-                                           rCanvas,
-                                           mnLayoutWidth,
-                                           maTextLineInfo );
+                maTextLinesHelper.init(mnLayoutWidth, maTextLineInfo);
 
                 initArrayAction( maState,
                                  mxTextLayout,
@@ -1369,14 +1359,12 @@ namespace cppcanvas
                 return ::basegfx::unotools::xPolyPolygonFromB2DPolygon(rCanvas->getDevice(), aTextBoundsPoly);
             }
 
-            bool EffectTextArrayAction::operator()( const rendering::RenderState& rRenderState, const ::Color& rTextFillColor, bool /*bNormalText*/ ) const
+            bool EffectTextArrayAction::operator()( const rendering::RenderState& rRenderState, const ::Color& rTextFillColor, bool bNormalText) const
             {
                 const rendering::ViewState& rViewState( mpCanvas->getViewState() );
                 const uno::Reference< rendering::XCanvas >& rCanvas( mpCanvas->getUNOCanvas() );
 
-                rCanvas->fillPolyPolygon( mxTextLines,
-                                          rViewState,
-                                          rRenderState );
+                maTextLinesHelper.render(rRenderState, bNormalText);
 
                 //rhbz#1589029 non-transparent text fill background support
                 if (rTextFillColor != COL_AUTO)
@@ -1419,21 +1407,19 @@ namespace cppcanvas
             public:
                 EffectTextArrayRenderHelper( const uno::Reference< rendering::XCanvas >&        rCanvas,
                                              const uno::Reference< rendering::XTextLayout >&    rTextLayout,
-                                             const uno::Reference< rendering::XPolyPolygon2D >& rLinePolygon,
+                                             const TextLinesHelper&                             rTextLinesHelper,
                                              const rendering::ViewState&                        rViewState ) :
                     mrCanvas( rCanvas ),
                     mrTextLayout( rTextLayout ),
-                    mrLinePolygon( rLinePolygon ),
+                    mrTextLinesHelper( rTextLinesHelper ),
                     mrViewState( rViewState )
                 {
                 }
 
                 // TextRenderer interface
-                virtual bool operator()( const rendering::RenderState& rRenderState, const ::Color& rTextFillColor,bool /*bNormalText*/ ) const override
+                virtual bool operator()( const rendering::RenderState& rRenderState, const ::Color& rTextFillColor,bool bNormalText) const override
                 {
-                    mrCanvas->fillPolyPolygon( mrLinePolygon,
-                                               mrViewState,
-                                               rRenderState );
+                    mrTextLinesHelper.render(rRenderState, bNormalText);
 
                     //rhbz#1589029 non-transparent text fill background support
                     if (rTextFillColor != COL_AUTO)
@@ -1465,7 +1451,7 @@ namespace cppcanvas
 
                 const uno::Reference< rendering::XCanvas >&         mrCanvas;
                 const uno::Reference< rendering::XTextLayout >&     mrTextLayout;
-                const uno::Reference< rendering::XPolyPolygon2D >&  mrLinePolygon;
+                const TextLinesHelper&                              mrTextLinesHelper;
                 const rendering::ViewState&                         mrViewState;
             };
 
@@ -1500,12 +1486,8 @@ namespace cppcanvas
                 uno::Reference< rendering::XCanvas > xCanvas( mpCanvas->getUNOCanvas() );
                 const rendering::ViewState&          rViewState( mpCanvas->getViewState() );
 
-                uno::Reference< rendering::XPolyPolygon2D > xTextLines(
-                    ::basegfx::unotools::xPolyPolygonFromB2DPolyPolygon(
-                        xCanvas->getDevice(),
-                        tools::createTextLinesPolyPolygon(
-                            0.0, nMaxPos - nMinPos,
-                            maTextLineInfo ) ) );
+                TextLinesHelper aHelper = maTextLinesHelper;
+                aHelper.init(nMaxPos - nMinPos, maTextLineInfo);
 
 
                 // render everything
@@ -1514,7 +1496,7 @@ namespace cppcanvas
                 return renderEffectText(
                     EffectTextArrayRenderHelper( xCanvas,
                                                  xTextLayout,
-                                                 xTextLines,
+                                                 aHelper,
                                                  rViewState ),
                     aLocalState,
                     xCanvas,
@@ -1530,11 +1512,13 @@ namespace cppcanvas
                 rendering::RenderState aLocalState( maState );
                 ::canvas::tools::prependToRenderState(aLocalState, rTransformation);
 
+                ::basegfx::B2DSize aSize = maTextLinesHelper.getOverallSize();
+
                 return calcEffectTextBounds( ::basegfx::unotools::b2DRectangleFromRealRectangle2D(
                                                  mxTextLayout->queryTextBounds() ),
                                              ::basegfx::B2DRange( 0,0,
-                                                                  maLinesOverallSize.getX(),
-                                                                  maLinesOverallSize.getY() ),
+                                                                  aSize.getX(),
+                                                                  aSize.getY() ),
                                              maReliefOffset,
                                              maShadowOffset,
                                              aLocalState,
diff --git a/cppcanvas/source/mtfrenderer/textlineshelper.cxx b/cppcanvas/source/mtfrenderer/textlineshelper.cxx
new file mode 100644
index 000000000000..db88e5cb5ee7
--- /dev/null
+++ b/cppcanvas/source/mtfrenderer/textlineshelper.cxx
@@ -0,0 +1,127 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+
+#include <com/sun/star/rendering/XCanvas.hpp>
+#include <com/sun/star/rendering/StrokeAttributes.hpp>
+#include <com/sun/star/rendering/PathJoinType.hpp>
+#include <basegfx/polygon/b2dpolypolygontools.hxx>
+#include <basegfx/utils/canvastools.hxx>
+#include <outdevstate.hxx>
+#include "textlineshelper.hxx"
+#include "mtftools.hxx"
+
+using namespace ::com::sun::star;
+
+namespace
+{
+void initLineStyleWaveline(sal_uInt32 nLineStyle, bool& bIsWaveline, bool& bIsBold)
+{
+    bIsWaveline = nLineStyle == LINESTYLE_DOUBLEWAVE || nLineStyle == LINESTYLE_SMALLWAVE
+                  || nLineStyle == LINESTYLE_BOLDWAVE || nLineStyle == LINESTYLE_WAVE;
+    bIsBold = nLineStyle == LINESTYLE_BOLDWAVE;
+}
+}
+
+namespace cppcanvas
+{
+namespace internal
+{
+TextLinesHelper::TextLinesHelper(const CanvasSharedPtr& rCanvas, const OutDevState& rState)
+    : mpCanvas(rCanvas)
+    , mbIsOverlineColorSet(rState.isTextOverlineColorSet)
+    , maOverlineColor(rState.textOverlineColor)
+    , mbIsUnderlineColorSet(rState.isTextLineColorSet)
+    , maUnderlineColor(rState.textLineColor)
+    , mbOverlineWaveline(false)
+    , mbUnderlineWaveline(false)
+    , mbOverlineWavelineBold(false)
+    , mbUnderlineWavelineBold(false)
+{
+}
+
+void TextLinesHelper::init(double nLineWidth, const tools::TextLineInfo& rLineInfo)
+{
+    ::basegfx::B2DRange aRange; // default is empty.
+    ::basegfx::B2DPolyPolygon aOverline, aUnderline, aStrikeout;
+    tools::createTextLinesPolyPolygon(0.0, nLineWidth, rLineInfo, aOverline, aUnderline,
+                                      aStrikeout);
+
+    mxOverline.clear();
+    mxUnderline.clear();
+    mxStrikeout.clear();
+
+    uno::Reference<rendering::XGraphicDevice> xDevice = mpCanvas->getUNOCanvas()->getDevice();
+
+    if (aOverline.count())
+    {
+        aRange.expand(::basegfx::utils::getRange(aOverline));
+        mxOverline = ::basegfx::unotools::xPolyPolygonFromB2DPolyPolygon(xDevice, aOverline);
+    }
+
+    if (aUnderline.count())
+    {
+        aRange.expand(::basegfx::utils::getRange(aUnderline));
+        mxUnderline = ::basegfx::unotools::xPolyPolygonFromB2DPolyPolygon(xDevice, aUnderline);
+    }
+
+    if (aStrikeout.count())
+    {
+        aRange.expand(::basegfx::utils::getRange(aStrikeout));
+        mxStrikeout = ::basegfx::unotools::xPolyPolygonFromB2DPolyPolygon(xDevice, aStrikeout);
+    }
+
+    maOverallSize = aRange.getRange();
+
+    initLineStyleWaveline(rLineInfo.mnOverlineStyle, mbOverlineWaveline, mbOverlineWavelineBold);
+
+    initLineStyleWaveline(rLineInfo.mnUnderlineStyle, mbUnderlineWaveline, mbUnderlineWavelineBold);
+}
+
+void TextLinesHelper::render(const rendering::RenderState& rRenderState, bool bNormalText) const
+{
+    const rendering::ViewState& rViewState(mpCanvas->getViewState());
+    const uno::Reference<rendering::XCanvas>& xCanvas(mpCanvas->getUNOCanvas());
+    rendering::StrokeAttributes aStrokeAttributes;
+    aStrokeAttributes.JoinType = rendering::PathJoinType::ROUND;
+
+    if (mxOverline.is())
+    {
+        rendering::RenderState aLocalState(rRenderState);
+        if (bNormalText && mbIsOverlineColorSet)
+            aLocalState.DeviceColor = maOverlineColor;
+
+        if (mbOverlineWaveline)
+        {
+            aStrokeAttributes.StrokeWidth = mbOverlineWavelineBold ? 2.0 : 1.0;
+            xCanvas->strokePolyPolygon(mxOverline, rViewState, aLocalState, aStrokeAttributes);
+        }
+        else
+            xCanvas->fillPolyPolygon(mxOverline, rViewState, aLocalState);
+    }
+
+    if (mxUnderline.is())
+    {
+        rendering::RenderState aLocalState(rRenderState);
+        if (bNormalText && mbIsUnderlineColorSet)
+            aLocalState.DeviceColor = maUnderlineColor;
+        if (mbUnderlineWaveline)
+        {
+            aStrokeAttributes.StrokeWidth = mbUnderlineWavelineBold ? 2.0 : 1.0;
+            xCanvas->strokePolyPolygon(mxUnderline, rViewState, aLocalState, aStrokeAttributes);
+        }
+        else
+            xCanvas->fillPolyPolygon(mxUnderline, rViewState, aLocalState);
+    }
+
+    if (mxStrikeout.is())
+        xCanvas->fillPolyPolygon(mxStrikeout, rViewState, rRenderState);
+}
+}
+}
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/cppcanvas/source/mtfrenderer/textlineshelper.hxx b/cppcanvas/source/mtfrenderer/textlineshelper.hxx
new file mode 100644
index 000000000000..fb06e345b64b
--- /dev/null
+++ b/cppcanvas/source/mtfrenderer/textlineshelper.hxx
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+#ifndef INCLUDED_CPPCANVAS_SOURCE_MTFRENDERER_TEXTLINESHELPER_HXX
+#define INCLUDED_CPPCANVAS_SOURCE_MTFRENDERER_TEXTLINESHELPER_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <basegfx/vector/b2dsize.hxx>
+#include <canvasgraphichelper.hxx>
+
+namespace com
+{
+namespace sun
+{
+namespace star
+{
+namespace rendering
+{
+class XPolyPolygon2D;
+}
+}
+}
+}
+
+namespace cppcanvas
+{
+namespace tools
+{
+struct TextLineInfo;
+}
+
+namespace internal
+{
+struct OutDevState;
+
+class TextLinesHelper
+{
+    const CanvasSharedPtr mpCanvas;
+    css::uno::Reference<css::rendering::XPolyPolygon2D> mxOverline;
+    css::uno::Reference<css::rendering::XPolyPolygon2D> mxUnderline;
+    css::uno::Reference<css::rendering::XPolyPolygon2D> mxStrikeout;
+
+    ::basegfx::B2DSize maOverallSize;
+
+    bool mbIsOverlineColorSet;
+    const css::uno::Sequence<double> maOverlineColor;
+
+    bool mbIsUnderlineColorSet;
+    const css::uno::Sequence<double> maUnderlineColor;
+
+    bool mbOverlineWaveline;
+    bool mbUnderlineWaveline;
+
+    bool mbOverlineWavelineBold;
+    bool mbUnderlineWavelineBold;
+
+public:
+    TextLinesHelper(const CanvasSharedPtr& rCanvas, const OutDevState& rState);
+
+    ::basegfx::B2DSize getOverallSize() const { return maOverallSize; }
+
+    /** Init textlines with specified linewdith and TextLineInfo.
+     */
+    void init(double nLineWidth, const tools::TextLineInfo& rLineInfo);
+
+    /** Fill the textlines with colors.
+        OutDevState::textUnderlineColor.
+
+        @param rRenderState
+        Used to invoke XCanvas::fillPolyPolygon.
+
+        @param bNormalText
+        Use overline color and underline color if the value is true, ignore those
+        colors otherwise ( typical case is to render the shadow ).
+     */
+    void render(const css::rendering::RenderState& rRenderState, bool bNormalText) const;
+};
+}
+}
+#endif // INCLUDED_CPPCANVAS_SOURCE_MTFRENDERER_TEXTLINESHELPER_HXX
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */