use vcl lin. gradient drawing in drawinglayer + cairo impl.

This adds a divert for drawing of linear gradients drawing, which
can be implemented natively with a much higher quality and speed.

This also adds a implementation of drawing linear gradients with
cairo.

Change-Id: I8c39915c3579e6eb88cdce8ae4ac9694ffdb4957
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/103374
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

4 files changed, 124 insertions, 1 deletions

diff --git a/drawinglayer/source/processor2d/vclpixelprocessor2d.cxx b/drawinglayer/source/processor2d/vclpixelprocessor2d.cxx
index 716c23028ba6..4314c656c389 100644
--- a/drawinglayer/source/processor2d/vclpixelprocessor2d.cxx
+++ b/drawinglayer/source/processor2d/vclpixelprocessor2d.cxx
@@ -53,6 +53,7 @@
 #include <drawinglayer/primitive2d/wrongspellprimitive2d.hxx>
 #include <drawinglayer/primitive2d/controlprimitive2d.hxx>
 #include <drawinglayer/primitive2d/borderlineprimitive2d.hxx>
+#include <drawinglayer/primitive2d/fillgradientprimitive2d.hxx>
 #include <drawinglayer/primitive2d/unifiedtransparenceprimitive2d.hxx>
 #include <drawinglayer/primitive2d/pagepreviewprimitive2d.hxx>
 #include <drawinglayer/primitive2d/backgroundcolorprimitive2d.hxx>
@@ -66,6 +67,13 @@
 #include <com/sun/star/awt/XWindow2.hpp>
 #include <com/sun/star/awt/XControl.hpp>
 
+#include <vcl/window.hxx>
+#include <vcl/gradient.hxx>
+#include <svtools/borderhelper.hxx>
+#include <editeng/borderline.hxx>
+
+#include <com/sun/star/table/BorderLineStyle.hpp>
+
 using namespace com::sun::star;
 
 namespace drawinglayer::processor2d
@@ -198,6 +206,30 @@ bool VclPixelProcessor2D::tryDrawPolygonStrokePrimitive2DDirect(
         /* false bBypassAACheck, default*/);
 }
 
+namespace
+{
+GradientStyle convertGradientStyle(drawinglayer::attribute::GradientStyle eGradientStyle)
+{
+    switch (eGradientStyle)
+    {
+        case drawinglayer::attribute::GradientStyle::Axial:
+            return GradientStyle::Axial;
+        case drawinglayer::attribute::GradientStyle::Radial:
+            return GradientStyle::Radial;
+        case drawinglayer::attribute::GradientStyle::Elliptical:
+            return GradientStyle::Elliptical;
+        case drawinglayer::attribute::GradientStyle::Square:
+            return GradientStyle::Square;
+        case drawinglayer::attribute::GradientStyle::Rect:
+            return GradientStyle::Rect;
+        case drawinglayer::attribute::GradientStyle::Linear:
+        default:
+            return GradientStyle::Linear;
+    }
+}
+
+} // end anonymous namespace
+
 void VclPixelProcessor2D::processBasePrimitive2D(const primitive2d::BasePrimitive2D& rCandidate)
 {
     switch (rCandidate.getPrimitive2DID())
@@ -400,6 +432,12 @@ void VclPixelProcessor2D::processBasePrimitive2D(const primitive2d::BasePrimitiv
                 static_cast<const drawinglayer::primitive2d::ShadowPrimitive2D&>(rCandidate));
             break;
         }
+        case PRIMITIVE2D_ID_FILLGRADIENTPRIMITIVE2D:
+        {
+            processFillGradientPrimitive2D(
+                static_cast<const drawinglayer::primitive2d::FillGradientPrimitive2D&>(rCandidate));
+            break;
+        }
         default:
         {
             SAL_INFO("drawinglayer", "default case for " << drawinglayer::primitive2d::idToString(
@@ -1141,6 +1179,39 @@ void VclPixelProcessor2D::processShadowPrimitive2D(const primitive2d::ShadowPrim
         SAL_WARN("drawinglayer", "Temporary buffered virtual device is not visible");
 }
 
+void VclPixelProcessor2D::processFillGradientPrimitive2D(
+    const primitive2d::FillGradientPrimitive2D& rPrimitive)
+{
+    const attribute::FillGradientAttribute& rFillGradient = rPrimitive.getFillGradient();
+
+    if (rFillGradient.getSteps() > 0
+        || rFillGradient.getStyle() != drawinglayer::attribute::GradientStyle::Linear)
+    {
+        process(rPrimitive);
+        return;
+    }
+
+    GradientStyle eGradientStyle = convertGradientStyle(rFillGradient.getStyle());
+
+    basegfx::B2DRange aRange(rPrimitive.getOutputRange());
+    aRange.transform(maCurrentTransformation);
+
+    const tools::Rectangle aRectangle(
+        sal_Int32(std::floor(aRange.getMinX())), sal_Int32(std::floor(aRange.getMinY())),
+        sal_Int32(std::ceil(aRange.getMaxX())), sal_Int32(std::ceil(aRange.getMaxY())));
+
+    Gradient aGradient(eGradientStyle, Color(rFillGradient.getStartColor()),
+                       Color(rFillGradient.getEndColor()));
+
+    aGradient.SetAngle(rFillGradient.getAngle() / F_PI1800);
+    aGradient.SetBorder(rFillGradient.getBorder() * 100);
+    aGradient.SetOfsX(rFillGradient.getOffsetX() * 100.0);
+    aGradient.SetOfsY(rFillGradient.getOffsetY() * 100.0);
+    aGradient.SetSteps(rFillGradient.getSteps());
+
+    mpOutputDevice->DrawGradient(aRectangle, aGradient);
+}
+
 } // end of namespace
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/drawinglayer/source/processor2d/vclpixelprocessor2d.hxx b/drawinglayer/source/processor2d/vclpixelprocessor2d.hxx
index c3bd19141669..480fdcaa6e18 100644
--- a/drawinglayer/source/processor2d/vclpixelprocessor2d.hxx
+++ b/drawinglayer/source/processor2d/vclpixelprocessor2d.hxx
@@ -42,6 +42,7 @@ class BorderLinePrimitive2D;
 class GlowPrimitive2D;
 class ShadowPrimitive2D;
 class SoftEdgePrimitive2D;
+class FillGradientPrimitive2D;
 }
 
 namespace drawinglayer::processor2d
@@ -99,6 +100,7 @@ class VclPixelProcessor2D final : public VclProcessor2D
     void processGlowPrimitive2D(const primitive2d::GlowPrimitive2D& rCandidate);
     void processSoftEdgePrimitive2D(const primitive2d::SoftEdgePrimitive2D& rCandidate);
     void processShadowPrimitive2D(const primitive2d::ShadowPrimitive2D& rCandidate);
+    void processFillGradientPrimitive2D(const primitive2d::FillGradientPrimitive2D& rPrimitive);
 
 public:
     /// constructor/destructor
diff --git a/vcl/headless/svpgdi.cxx b/vcl/headless/svpgdi.cxx
index 458ac9cb565a..e769474c3dd5 100644
--- a/vcl/headless/svpgdi.cxx
+++ b/vcl/headless/svpgdi.cxx
@@ -1910,6 +1910,55 @@ bool SvpSalGraphics::drawPolyPolygon(
     return true;
 }
 
+bool SvpSalGraphics::drawGradient(const tools::PolyPolygon& rPolyPolygon, const Gradient& rGradient)
+{
+    cairo_t* cr = getCairoContext(true);
+    clipRegion(cr);
+
+    basegfx::B2DPolyPolygon aB2DPolyPolygon(rPolyPolygon.getB2DPolyPolygon());
+
+    for (auto const & rPolygon : aB2DPolyPolygon)
+    {
+        basegfx::B2DHomMatrix rObjectToDevice;
+        AddPolygonToPath(cr, rPolygon, rObjectToDevice, !getAntiAliasB2DDraw(), false);
+    }
+
+    Gradient aGradient(rGradient);
+
+    tools::Rectangle aInputRect(rPolyPolygon.GetBoundRect());
+    tools::Rectangle aBoundRect;
+    Point aCenter;
+
+    aGradient.SetAngle(aGradient.GetAngle() + 2700);
+    aGradient.GetBoundRect(aInputRect, aBoundRect, aCenter);
+
+    tools::Polygon aPoly(aBoundRect);
+    aPoly.Rotate(aCenter, aGradient.GetAngle() % 3600);
+
+    cairo_pattern_t* pattern;
+    pattern = cairo_pattern_create_linear(aPoly[0].X(), aPoly[0].Y(), aPoly[1].X(), aPoly[1].Y());
+
+    cairo_pattern_add_color_stop_rgba(pattern, aGradient.GetBorder() / 100.0,
+                                                    aGradient.GetStartColor().GetRed()   / 255.0,
+                                                    aGradient.GetStartColor().GetGreen() / 255.0,
+                                                    aGradient.GetStartColor().GetBlue()  / 255.0,
+                                                    1.0);
+
+    cairo_pattern_add_color_stop_rgba(pattern, 1.0,
+                                                    aGradient.GetEndColor().GetRed()   / 255.0,
+                                                    aGradient.GetEndColor().GetGreen() / 255.0,
+                                                    aGradient.GetEndColor().GetBlue()  / 255.0,
+                                                    1.0);
+    cairo_set_source(cr, pattern);
+
+    basegfx::B2DRange extents = getClippedFillDamage(cr);
+    cairo_fill_preserve(cr);
+
+    releaseCairoContext(cr, true, extents);
+
+    return true;
+}
+
 bool SvpSalGraphics::implDrawGradient(basegfx::B2DPolyPolygon const & rPolyPolygon, SalGradient const & rGradient)
 {
     cairo_t* cr = getCairoContext(true);
diff --git a/vcl/inc/headless/svpgdi.hxx b/vcl/inc/headless/svpgdi.hxx
index 3cffdcd2a1c0..8ffe104627c4 100644
--- a/vcl/inc/headless/svpgdi.hxx
+++ b/vcl/inc/headless/svpgdi.hxx
@@ -232,7 +232,8 @@ public:
                                                    const sal_uInt32* pPoints,
                                                    const SalPoint* const* pPtAry,
                                                    const PolyFlags* const* pFlgAry ) override;
-    virtual bool            drawGradient( const tools::PolyPolygon&, const Gradient& ) override { return false; };
+
+    virtual bool drawGradient(tools::PolyPolygon const & rPolyPolygon, Gradient const & rGradient) override;
 
     virtual bool implDrawGradient(basegfx::B2DPolyPolygon const & rPolyPolygon, SalGradient const & rGradient) override;