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diff --git a/canvas/source/tools/surface.cxx b/canvas/source/tools/surface.cxx
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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 <basegfx/matrix/b2dhommatrixtools.hxx>
+#include <basegfx/polygon/b2dpolygonclipper.hxx>
+#include <comphelper/scopeguard.hxx>
+#include <utility>
+
+#include "surface.hxx"
+
+namespace canvas
+{
+ Surface::Surface( PageManagerSharedPtr rPageManager,
+ std::shared_ptr<IColorBuffer> xColorBuffer,
+ const ::basegfx::B2IPoint& rPos,
+ const ::basegfx::B2ISize& rSize ) :
+ mpColorBuffer(std::move(xColorBuffer)),
+ mpPageManager(std::move(rPageManager)),
+ maSourceOffset(rPos),
+ maSize(rSize),
+ mbIsDirty(true)
+ {
+ }
+
+ Surface::~Surface()
+ {
+ if(mpFragment)
+ mpPageManager->free(mpFragment);
+ }
+
+ void Surface::setColorBufferDirty()
+ {
+ mbIsDirty=true;
+ }
+
+ basegfx::B2DRectangle Surface::getUVCoords() const
+ {
+ ::basegfx::B2ISize aPageSize(mpPageManager->getPageSize());
+ ::basegfx::B2IPoint aDestOffset;
+ if( mpFragment )
+ aDestOffset = mpFragment->getPos();
+
+ const double pw( aPageSize.getX() );
+ const double ph( aPageSize.getY() );
+ const double ox( aDestOffset.getX() );
+ const double oy( aDestOffset.getY() );
+ const double sx( maSize.getX() );
+ const double sy( maSize.getY() );
+
+ return ::basegfx::B2DRectangle( ox/pw,
+ oy/ph,
+ (ox+sx)/pw,
+ (oy+sy)/ph );
+ }
+
+ basegfx::B2DRectangle Surface::getUVCoords( const ::basegfx::B2IPoint& rPos,
+ const ::basegfx::B2ISize& rSize ) const
+ {
+ ::basegfx::B2ISize aPageSize(mpPageManager->getPageSize());
+
+ const double pw( aPageSize.getX() );
+ const double ph( aPageSize.getY() );
+ const double ox( rPos.getX() );
+ const double oy( rPos.getY() );
+ const double sx( rSize.getX() );
+ const double sy( rSize.getY() );
+
+ return ::basegfx::B2DRectangle( ox/pw,
+ oy/ph,
+ (ox+sx)/pw,
+ (oy+sy)/ph );
+ }
+
+ bool Surface::draw( double fAlpha,
+ const ::basegfx::B2DPoint& rPos,
+ const ::basegfx::B2DHomMatrix& rTransform )
+ {
+ std::shared_ptr<IRenderModule> pRenderModule(mpPageManager->getRenderModule());
+
+ RenderModuleGuard aGuard( pRenderModule );
+
+ prepareRendering();
+
+ // convert size to normalized device coordinates
+ const ::basegfx::B2DRectangle& rUV( getUVCoords() );
+
+ const double u1(rUV.getMinX());
+ const double v1(rUV.getMinY());
+ const double u2(rUV.getMaxX());
+ const double v2(rUV.getMaxY());
+
+ // concat transforms
+ // 1) offset of surface subarea
+ // 2) surface transform
+ // 3) translation to output position [rPos]
+ // 4) scale to normalized device coordinates
+ // 5) flip y-axis
+ // 6) translate to account for viewport transform
+ basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(
+ maSourceOffset.getX(), maSourceOffset.getY()));
+ aTransform = aTransform * rTransform;
+ aTransform.translate(::basegfx::fround(rPos.getX()),
+ ::basegfx::fround(rPos.getY()));
+
+ /*
+ ######################################
+ ######################################
+ ######################################
+
+ Y
+ ^+1
+ |
+ 2 | 3
+ x------------x
+ | | |
+ | | |
+ ------|-----O------|------>X
+ -1 | | | +1
+ | | |
+ x------------x
+ 1 | 0
+ |
+ |-1
+
+ ######################################
+ ######################################
+ ######################################
+ */
+
+ const ::basegfx::B2DPoint& p0(aTransform * ::basegfx::B2DPoint(maSize.getX(),maSize.getY()));
+ const ::basegfx::B2DPoint& p1(aTransform * ::basegfx::B2DPoint(0.0,maSize.getY()));
+ const ::basegfx::B2DPoint& p2(aTransform * ::basegfx::B2DPoint(0.0,0.0));
+ const ::basegfx::B2DPoint& p3(aTransform * ::basegfx::B2DPoint(maSize.getX(),0.0));
+
+ canvas::Vertex vertex;
+ vertex.r = 1.0f;
+ vertex.g = 1.0f;
+ vertex.b = 1.0f;
+ vertex.a = static_cast<float>(fAlpha);
+ vertex.z = 0.0f;
+
+ {
+ pRenderModule->beginPrimitive( canvas::IRenderModule::PrimitiveType::Quad );
+
+ // issue an endPrimitive() when leaving the scope
+ const ::comphelper::ScopeGuard aScopeGuard(
+ [&pRenderModule]() mutable { pRenderModule->endPrimitive(); } );
+
+ vertex.u=static_cast<float>(u2); vertex.v=static_cast<float>(v2);
+ vertex.x=static_cast<float>(p0.getX()); vertex.y=static_cast<float>(p0.getY());
+ pRenderModule->pushVertex(vertex);
+
+ vertex.u=static_cast<float>(u1); vertex.v=static_cast<float>(v2);
+ vertex.x=static_cast<float>(p1.getX()); vertex.y=static_cast<float>(p1.getY());
+ pRenderModule->pushVertex(vertex);
+
+ vertex.u=static_cast<float>(u1); vertex.v=static_cast<float>(v1);
+ vertex.x=static_cast<float>(p2.getX()); vertex.y=static_cast<float>(p2.getY());
+ pRenderModule->pushVertex(vertex);
+
+ vertex.u=static_cast<float>(u2); vertex.v=static_cast<float>(v1);
+ vertex.x=static_cast<float>(p3.getX()); vertex.y=static_cast<float>(p3.getY());
+ pRenderModule->pushVertex(vertex);
+ }
+
+ return !(pRenderModule->isError());
+ }
+
+ bool Surface::drawRectangularArea(
+ double fAlpha,
+ const ::basegfx::B2DPoint& rPos,
+ const ::basegfx::B2DRectangle& rArea,
+ const ::basegfx::B2DHomMatrix& rTransform )
+ {
+ if( rArea.isEmpty() )
+ return true; // immediate exit for empty area
+
+ std::shared_ptr<IRenderModule> pRenderModule(mpPageManager->getRenderModule());
+
+ RenderModuleGuard aGuard( pRenderModule );
+
+ prepareRendering();
+
+ // these positions are relative to the texture
+ ::basegfx::B2IPoint aPos1(
+ ::basegfx::fround(rArea.getMinimum().getX()),
+ ::basegfx::fround(rArea.getMinimum().getY()));
+ ::basegfx::B2IPoint aPos2(
+ ::basegfx::fround(rArea.getMaximum().getX()),
+ ::basegfx::fround(rArea.getMaximum().getY()) );
+
+ // clip the positions to the area this surface covers
+ aPos1.setX(std::max(aPos1.getX(),maSourceOffset.getX()));
+ aPos1.setY(std::max(aPos1.getY(),maSourceOffset.getY()));
+ aPos2.setX(std::min(aPos2.getX(),maSourceOffset.getX()+maSize.getX()));
+ aPos2.setY(std::min(aPos2.getY(),maSourceOffset.getY()+maSize.getY()));
+
+ // if the resulting area is empty, return immediately
+ ::basegfx::B2IVector aSize(aPos2 - aPos1);
+ if(aSize.getX() <= 0 || aSize.getY() <= 0)
+ return true;
+
+ ::basegfx::B2IPoint aDestOffset;
+ if( mpFragment )
+ aDestOffset = mpFragment->getPos();
+
+ // convert size to normalized device coordinates
+ const ::basegfx::B2DRectangle& rUV(
+ getUVCoords(aPos1 - maSourceOffset + aDestOffset,
+ aSize) );
+ const double u1(rUV.getMinX());
+ const double v1(rUV.getMinY());
+ const double u2(rUV.getMaxX());
+ const double v2(rUV.getMaxY());
+
+ // concatenate transforms
+ // 1) offset of surface subarea
+ // 2) surface transform
+ // 3) translation to output position [rPos]
+ basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(aPos1.getX(), aPos1.getY()));
+ aTransform = aTransform * rTransform;
+ aTransform.translate(::basegfx::fround(rPos.getX()),
+ ::basegfx::fround(rPos.getY()));
+
+
+ /*
+ ######################################
+ ######################################
+ ######################################
+
+ Y
+ ^+1
+ |
+ 2 | 3
+ x------------x
+ | | |
+ | | |
+ ------|-----O------|------>X
+ -1 | | | +1
+ | | |
+ x------------x
+ 1 | 0
+ |
+ |-1
+
+ ######################################
+ ######################################
+ ######################################
+ */
+
+ const ::basegfx::B2DPoint& p0(aTransform * ::basegfx::B2DPoint(aSize.getX(),aSize.getY()));
+ const ::basegfx::B2DPoint& p1(aTransform * ::basegfx::B2DPoint(0.0, aSize.getY()));
+ const ::basegfx::B2DPoint& p2(aTransform * ::basegfx::B2DPoint(0.0, 0.0));
+ const ::basegfx::B2DPoint& p3(aTransform * ::basegfx::B2DPoint(aSize.getX(),0.0));
+
+ canvas::Vertex vertex;
+ vertex.r = 1.0f;
+ vertex.g = 1.0f;
+ vertex.b = 1.0f;
+ vertex.a = static_cast<float>(fAlpha);
+ vertex.z = 0.0f;
+
+ {
+ pRenderModule->beginPrimitive( canvas::IRenderModule::PrimitiveType::Quad );
+
+ // issue an endPrimitive() when leaving the scope
+ const ::comphelper::ScopeGuard aScopeGuard(
+ [&pRenderModule]() mutable { pRenderModule->endPrimitive(); } );
+
+ vertex.u=static_cast<float>(u2); vertex.v=static_cast<float>(v2);
+ vertex.x=static_cast<float>(p0.getX()); vertex.y=static_cast<float>(p0.getY());
+ pRenderModule->pushVertex(vertex);
+
+ vertex.u=static_cast<float>(u1); vertex.v=static_cast<float>(v2);
+ vertex.x=static_cast<float>(p1.getX()); vertex.y=static_cast<float>(p1.getY());
+ pRenderModule->pushVertex(vertex);
+
+ vertex.u=static_cast<float>(u1); vertex.v=static_cast<float>(v1);
+ vertex.x=static_cast<float>(p2.getX()); vertex.y=static_cast<float>(p2.getY());
+ pRenderModule->pushVertex(vertex);
+
+ vertex.u=static_cast<float>(u2); vertex.v=static_cast<float>(v1);
+ vertex.x=static_cast<float>(p3.getX()); vertex.y=static_cast<float>(p3.getY());
+ pRenderModule->pushVertex(vertex);
+ }
+
+ return !(pRenderModule->isError());
+ }
+
+ bool Surface::drawWithClip( double fAlpha,
+ const ::basegfx::B2DPoint& rPos,
+ const ::basegfx::B2DPolygon& rClipPoly,
+ const ::basegfx::B2DHomMatrix& rTransform )
+ {
+ std::shared_ptr<IRenderModule> pRenderModule(mpPageManager->getRenderModule());
+
+ RenderModuleGuard aGuard( pRenderModule );
+
+ prepareRendering();
+
+ // untransformed surface rectangle, relative to the whole
+ // image (note: this surface might actually only be a tile of
+ // the whole image, with non-zero maSourceOffset)
+ const double x1(maSourceOffset.getX());
+ const double y1(maSourceOffset.getY());
+ const double w(maSize.getX());
+ const double h(maSize.getY());
+ const double x2(x1+w);
+ const double y2(y1+h);
+ const ::basegfx::B2DRectangle aSurfaceClipRect(x1,y1,x2,y2);
+
+ // concatenate transforms
+ // we use 'fround' here to avoid rounding errors. the vertices will
+ // be transformed by the overall transform and uv coordinates will
+ // be calculated from the result, and this is why we need to use
+ // integer coordinates here...
+ basegfx::B2DHomMatrix aTransform = rTransform;
+ aTransform.translate(::basegfx::fround(rPos.getX()),
+ ::basegfx::fround(rPos.getY()));
+
+ /*
+ ######################################
+ ######################################
+ ######################################
+
+ Y
+ ^+1
+ |
+ 2 | 3
+ x------------x
+ | | |
+ | | |
+ ------|-----O------|------>X
+ -1 | | | +1
+ | | |
+ x------------x
+ 1 | 0
+ |
+ |-1
+
+ ######################################
+ ######################################
+ ######################################
+ */
+
+ // uv coordinates that map the surface rectangle
+ // to the destination rectangle.
+ const ::basegfx::B2DRectangle& rUV( getUVCoords() );
+
+ basegfx::B2DPolygon rTriangleList(basegfx::utils::clipTriangleListOnRange(rClipPoly,
+ aSurfaceClipRect));
+
+ // Push vertices to backend renderer
+ if(const sal_uInt32 nVertexCount = rTriangleList.count())
+ {
+ canvas::Vertex vertex;
+ vertex.r = 1.0f;
+ vertex.g = 1.0f;
+ vertex.b = 1.0f;
+ vertex.a = static_cast<float>(fAlpha);
+ vertex.z = 0.0f;
+
+ pRenderModule->beginPrimitive( canvas::IRenderModule::PrimitiveType::Triangle );
+
+ // issue an endPrimitive() when leaving the scope
+ const ::comphelper::ScopeGuard aScopeGuard(
+ [&pRenderModule]() mutable { pRenderModule->endPrimitive(); } );
+
+ for(sal_uInt32 nIndex=0; nIndex<nVertexCount; ++nIndex)
+ {
+ const basegfx::B2DPoint &aPoint = rTriangleList.getB2DPoint(nIndex);
+ basegfx::B2DPoint aTransformedPoint(aTransform * aPoint);
+ const double tu(((aPoint.getX()-aSurfaceClipRect.getMinX())*rUV.getWidth()/w)+rUV.getMinX());
+ const double tv(((aPoint.getY()-aSurfaceClipRect.getMinY())*rUV.getHeight()/h)+rUV.getMinY());
+ vertex.u=static_cast<float>(tu);
+ vertex.v=static_cast<float>(tv);
+ vertex.x=static_cast<float>(aTransformedPoint.getX());
+ vertex.y=static_cast<float>(aTransformedPoint.getY());
+ pRenderModule->pushVertex(vertex);
+ }
+ }
+
+ return !(pRenderModule->isError());
+ }
+
+ void Surface::prepareRendering()
+ {
+ mpPageManager->validatePages();
+
+ // clients requested to draw from this surface, therefore one
+ // of the above implemented concrete rendering operations
+ // was triggered. we therefore need to ask the pagemanager
+ // to allocate some space for the fragment we're dedicated to.
+ if(!mpFragment)
+ {
+ mpFragment = mpPageManager->allocateSpace(maSize);
+ if( mpFragment )
+ {
+ mpFragment->setColorBuffer(mpColorBuffer);
+ mpFragment->setSourceOffset(maSourceOffset);
+ }
+ }
+
+ if( mpFragment )
+ {
+ // now we need to 'select' the fragment, which will in turn
+ // pull information from the image on demand.
+ // in case this fragment is still not located on any of the
+ // available pages ['naked'], we force the page manager to
+ // do it now, no way to defer this any longer...
+ if(!(mpFragment->select(mbIsDirty)))
+ mpPageManager->nakedFragment(mpFragment);
+
+ }
+ mbIsDirty=false;
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */