aeb0c407a6
To get the anti-aliased polygon we draw a anti-aliased line around every trapezoid. This works fine until we draw a transparent polygon where the lines become visible because of blending. A much better and faster way is to just draw the polygon outline with anti-aliased lines. This is done with this commit. Change-Id: Ice50e5eb3343f2c5d51ade8ad0e170043541f0ff Reviewed-on: https://gerrit.libreoffice.org/27611 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
404 lines
16 KiB
C++
404 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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#include "opengl/RenderList.hxx"
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#include "opengl/VertexUtils.hxx"
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#include "opengl/LineRenderUtils.hxx"
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#include <basegfx/polygon/b2dpolygontools.hxx>
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#include <basegfx/polygon/b2dpolygontriangulator.hxx>
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#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
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#include <basegfx/polygon/b2dtrapezoid.hxx>
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namespace
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{
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/** Append vertices for the polyline
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*
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* OpenGL polyline drawing algorithm inspired by:
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* - http://mattdesl.svbtle.com/drawing-lines-is-hard
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* - https://www.mapbox.com/blog/drawing-antialiased-lines/
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* - https://cesiumjs.org/2013/04/22/Robust-Polyline-Rendering-with-WebGL/
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* - http://artgrammer.blogspot.si/2011/05/drawing-nearly-perfect-2d-line-segments.html
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* - http://artgrammer.blogspot.si/2011/07/drawing-polylines-by-tessellation.html
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*
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*/
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void appendPolyLine(vcl::LineBuilder& rBuilder, const basegfx::B2DPolygon& rPolygon,
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basegfx::B2DLineJoin eLineJoin, css::drawing::LineCap eLineCap,
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double fMiterMinimumAngle)
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{
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sal_uInt32 nPoints = rPolygon.count();
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bool bClosed = rPolygon.isClosed();
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if (nPoints == 2 || eLineJoin == basegfx::B2DLineJoin::NONE)
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{
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// If line joint is NONE or a simple line with 2 points, draw the polyline
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// each line segment separatly.
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for (sal_uInt32 i = 0; i < (bClosed ? nPoints : nPoints - 1); ++i)
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{
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sal_uInt32 index1 = (i + 0) % nPoints; // loop indices - important when polyline is closed
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sal_uInt32 index2 = (i + 1) % nPoints;
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glm::vec2 aPoint1(rPolygon.getB2DPoint(index1).getX(), rPolygon.getB2DPoint(index1).getY());
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glm::vec2 aPoint2(rPolygon.getB2DPoint(index2).getX(), rPolygon.getB2DPoint(index2).getY());
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rBuilder.appendLine(aPoint1, aPoint2);
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}
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}
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else if (nPoints > 2)
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{
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int i = 0;
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int lastPoint = int(nPoints);
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glm::vec2 p0(rPolygon.getB2DPoint(nPoints - 1).getX(), rPolygon.getB2DPoint(nPoints - 1).getY());
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glm::vec2 p1(rPolygon.getB2DPoint(0).getX(), rPolygon.getB2DPoint(0).getY());
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glm::vec2 p2(rPolygon.getB2DPoint(1).getX(), rPolygon.getB2DPoint(1).getY());
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glm::vec2 nextLineVector;
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glm::vec2 previousLineVector;
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glm::vec2 normal; // perpendicular to the line vector
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nextLineVector = vcl::vertex::normalize(p2 - p1);
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if (!bClosed)
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{
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normal = glm::vec2(-nextLineVector.y, nextLineVector.x); // make perpendicular
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rBuilder.appendAndConnectLinePoint(p1, normal, 1.0f);
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i++; // first point done already
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lastPoint--; // last point will be calculated separatly from the loop
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p0 = p1;
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previousLineVector = nextLineVector;
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}
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else
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{
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lastPoint++; // we need to connect last point to first point so one more line segment to calculate
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previousLineVector = vcl::vertex::normalize(p1 - p0);
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}
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for (; i < lastPoint; ++i)
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{
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int index1 = (i + 0) % nPoints; // loop indices - important when polyline is closed
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int index2 = (i + 1) % nPoints;
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p1 = glm::vec2(rPolygon.getB2DPoint(index1).getX(), rPolygon.getB2DPoint(index1).getY());
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p2 = glm::vec2(rPolygon.getB2DPoint(index2).getX(), rPolygon.getB2DPoint(index2).getY());
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if (p1 == p2) // skip equal points, normals could div-by-0
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continue;
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nextLineVector = vcl::vertex::normalize(p2 - p1);
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if (eLineJoin == basegfx::B2DLineJoin::Miter)
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{
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if (vcl::vertex::lineVectorAngle(previousLineVector, nextLineVector) < fMiterMinimumAngle)
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rBuilder.appendBevelJoint(p1, previousLineVector, nextLineVector);
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else
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rBuilder.appendMiterJoint(p1, previousLineVector, nextLineVector);
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}
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else if (eLineJoin == basegfx::B2DLineJoin::Bevel)
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{
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rBuilder.appendBevelJoint(p1, previousLineVector, nextLineVector);
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}
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else if (eLineJoin == basegfx::B2DLineJoin::Round)
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{
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rBuilder.appendRoundJoint(p1, previousLineVector, nextLineVector);
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}
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p0 = p1;
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previousLineVector = nextLineVector;
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}
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if (!bClosed)
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{
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// Create vertices for the last point. There is no line join so just
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// use the last line segment normal as the extrusion vector.
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p1 = glm::vec2(rPolygon.getB2DPoint(nPoints - 1).getX(), rPolygon.getB2DPoint(nPoints - 1).getY());
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normal = glm::vec2(-previousLineVector.y, previousLineVector.x);
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rBuilder.appendAndConnectLinePoint(p1, normal, 1.0f);
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}
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}
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if (!bClosed && nPoints >= 2 && (eLineCap == css::drawing::LineCap_ROUND || eLineCap == css::drawing::LineCap_SQUARE))
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{
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glm::vec2 aBeginCapPoint1(rPolygon.getB2DPoint(0).getX(), rPolygon.getB2DPoint(0).getY());
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glm::vec2 aBeginCapPoint2(rPolygon.getB2DPoint(1).getX(), rPolygon.getB2DPoint(1).getY());
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glm::vec2 aEndCapPoint1(rPolygon.getB2DPoint(nPoints - 1).getX(), rPolygon.getB2DPoint(nPoints - 1).getY());
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glm::vec2 aEndCapPoint2(rPolygon.getB2DPoint(nPoints - 2).getX(), rPolygon.getB2DPoint(nPoints - 2).getY());
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if (eLineCap == css::drawing::LineCap_ROUND)
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{
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rBuilder.appendRoundLineCapVertices(aBeginCapPoint1, aBeginCapPoint2);
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rBuilder.appendRoundLineCapVertices(aEndCapPoint1, aEndCapPoint2);
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}
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else if (eLineCap == css::drawing::LineCap_SQUARE)
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{
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rBuilder.appendSquareLineCapVertices(aBeginCapPoint1, aBeginCapPoint2);
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rBuilder.appendSquareLineCapVertices(aEndCapPoint1, aEndCapPoint2);
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}
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}
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}
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inline void appendTrapezoid(std::vector<Vertex>& rVertices, std::vector<GLuint>& rIndices,
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GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2,
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GLfloat x3, GLfloat y3, GLfloat x4, GLfloat y4,
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SalColor nColor, GLfloat fTransparency)
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{
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GLubyte nR, nG, nB, nA;
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vcl::vertex::createColor(nColor, fTransparency, nR, nG, nB, nA);
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GLuint zero = rVertices.size();
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rVertices.insert(rVertices.end(), {
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Vertex{glm::vec2{x1, y1}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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Vertex{glm::vec2{x2, y2}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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Vertex{glm::vec2{x3, y3}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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Vertex{glm::vec2{x4, y4}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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});
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rIndices.insert(rIndices.end(), {
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zero + 0, zero + 1, zero + 2,
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zero + 2, zero + 1, zero + 3
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});
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}
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void appendRectangle(std::vector<Vertex>& rVertices, std::vector<GLuint>& rIndices,
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GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2,
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SalColor nColor, GLfloat fTransparency)
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{
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GLubyte nR, nG, nB, nA;
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vcl::vertex::createColor(nColor, fTransparency, nR, nG, nB, nA);
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GLuint zero = rVertices.size();
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rVertices.insert(rVertices.end(), {
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Vertex{glm::vec2{x1, y1}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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Vertex{glm::vec2{x2, y1}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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Vertex{glm::vec2{x1, y2}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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Vertex{glm::vec2{x2, y2}, glm::vec4{nR, nG, nB, nA}, glm::vec4{0.0f, 0.0f, 0.0f, 0.0f}},
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});
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rIndices.insert(rIndices.end(), {
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zero + 0, zero + 1, zero + 2,
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zero + 2, zero + 1, zero + 3
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});
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}
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} // end anonymous namespace
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void RenderList::addDrawPixel(long nX, long nY, SalColor nColor)
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{
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if (nColor == SALCOLOR_NONE)
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return;
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checkOverlapping(basegfx::B2DRange(nX, nY, nX, nY));
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RenderParameters& rRenderParameter = maRenderEntries.back().maTriangleParameters;
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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nX - 0.5f, nY - 0.5f, nX + 0.5f, nY + 0.5f, nColor, 0.0f);
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}
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void RenderList::addDrawRectangle(long nX, long nY, long nWidth, long nHeight, double fTransparency,
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SalColor nLineColor, SalColor nFillColor)
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{
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if (nLineColor == SALCOLOR_NONE && nFillColor == SALCOLOR_NONE)
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return;
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if (fTransparency == 1.0f)
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return;
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GLfloat fX1(nX);
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GLfloat fY1(nY);
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GLfloat fX2(nX + nWidth - 1);
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GLfloat fY2(nY + nHeight - 1);
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checkOverlapping(basegfx::B2DRange(fX1, fY1, fX2, fY2));
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RenderParameters& rRenderParameter = maRenderEntries.back().maTriangleParameters;
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// Draw rectangle stroke with line color
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if (nLineColor != SALCOLOR_NONE)
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{
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 - 0.5f, fY1 - 0.5f, fX1 + 0.5f, fY2 + 0.5f, nLineColor, fTransparency);
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 - 0.5f, fY1 - 0.5f, fX2 + 0.5f, fY1 + 0.5f, nLineColor, fTransparency);
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX2 - 0.5f, fY1 - 0.5f, fX2 + 0.5f, fY2 + 0.5f, nLineColor, fTransparency);
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 - 0.5f, fY2 - 0.5f, fX2 + 0.5f, fY2 + 0.5f, nLineColor, fTransparency);
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}
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if (nFillColor != SALCOLOR_NONE)
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{
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if (nLineColor == SALCOLOR_NONE)
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{
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 - 0.5f, fY1 - 0.5f, fX1 + 0.5f, fY2 + 0.5f, nFillColor, fTransparency);
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 - 0.5f, fY1 - 0.5f, fX2 + 0.5f, fY1 + 0.5f, nFillColor, fTransparency);
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX2 - 0.5f, fY1 - 0.5f, fX2 + 0.5f, fY2 + 0.5f, nFillColor, fTransparency);
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 - 0.5f, fY2 - 0.5f, fX2 + 0.5f, fY2 + 0.5f, nFillColor, fTransparency);
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}
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// Draw rectangle fill with fill color
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appendRectangle(rRenderParameter.maVertices, rRenderParameter.maIndices,
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fX1 + 0.5f, fY1 + 0.5f, fX2 - 0.5f, fY2 - 0.5f, nFillColor, fTransparency);
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}
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}
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void RenderList::addDrawLine(long nX1, long nY1, long nX2, long nY2, SalColor nLineColor, bool bUseAA)
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{
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if (nLineColor == SALCOLOR_NONE)
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return;
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checkOverlapping(basegfx::B2DRange(nX1, nY1, nX2, nY2));
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RenderParameters& rRenderParameter = maRenderEntries.back().maLineParameters;
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glm::vec2 aPoint1(nX1, nY1);
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glm::vec2 aPoint2(nX2, nY2);
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vcl::LineBuilder aBuilder(rRenderParameter.maVertices, rRenderParameter.maIndices, nLineColor, 0.0f, 1.0f, bUseAA);
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aBuilder.appendLine(aPoint1, aPoint2);
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}
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void RenderList::addDrawPolyPolygon(const basegfx::B2DPolyPolygon& rPolyPolygon, double fTransparency,
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SalColor nLineColor, SalColor nFillColor, bool bUseAA)
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{
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if (rPolyPolygon.count() <= 0)
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return;
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if (nLineColor == SALCOLOR_NONE && nFillColor == SALCOLOR_NONE)
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return;
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if (fTransparency == 1.0)
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return;
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checkOverlapping(rPolyPolygon.getB2DRange());
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RenderParameters& rLineRenderParameter = maRenderEntries.back().maLineParameters;
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RenderParameters& rTriangleRenderParameter = maRenderEntries.back().maTriangleParameters;
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if (nFillColor != SALCOLOR_NONE)
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{
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basegfx::B2DTrapezoidVector aTrapezoidVector;
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basegfx::tools::trapezoidSubdivide(aTrapezoidVector, rPolyPolygon);
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if (!aTrapezoidVector.empty())
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{
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for (basegfx::B2DTrapezoid & rTrapezoid : aTrapezoidVector)
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{
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GLfloat topX1 = rTrapezoid.getTopXLeft();
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GLfloat topX2 = rTrapezoid.getTopXRight();
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GLfloat topY = rTrapezoid.getTopY();
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GLfloat bottomX1 = rTrapezoid.getBottomXLeft();
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GLfloat bottomX2 = rTrapezoid.getBottomXRight();
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GLfloat bottomY = rTrapezoid.getBottomY();
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appendTrapezoid(rTriangleRenderParameter.maVertices, rTriangleRenderParameter.maIndices,
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topX1, topY, topX2, topY,
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bottomX1, bottomY, bottomX2, bottomY,
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nFillColor, fTransparency);
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}
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}
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}
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if (nLineColor != SALCOLOR_NONE || bUseAA)
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{
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SalColor nColor = (nLineColor == SALCOLOR_NONE) ? nFillColor : nLineColor;
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vcl::LineBuilder aBuilder(rLineRenderParameter.maVertices, rLineRenderParameter.maIndices,
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nColor, fTransparency, 1.0f, bUseAA);
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for (const basegfx::B2DPolygon& rPolygon : rPolyPolygon)
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{
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basegfx::B2DPolygon aPolygon(rPolygon);
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if (rPolygon.areControlPointsUsed())
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aPolygon = rPolygon.getDefaultAdaptiveSubdivision();
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sal_uInt32 nPoints = aPolygon.count();
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GLfloat x1, y1, x2, y2;
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sal_uInt32 index1, index2;
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for (sal_uInt32 i = 0; i <= nPoints; ++i)
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{
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index1 = (i) % nPoints;
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index2 = (i + 1) % nPoints;
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x1 = aPolygon.getB2DPoint(index1).getX();
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y1 = aPolygon.getB2DPoint(index1).getY();
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x2 = aPolygon.getB2DPoint(index2).getX();
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y2 = aPolygon.getB2DPoint(index2).getY();
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aBuilder.appendLine(glm::vec2(x1, y1), glm::vec2(x2, y2));
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}
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}
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}
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}
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bool RenderList::addDrawTextureWithMaskColor(OpenGLTexture& rTexture, SalColor nColor, const SalTwoRect& r2Rect)
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{
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if (!rTexture)
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return false;
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GLfloat fX1 = r2Rect.mnDestX;
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GLfloat fY1 = r2Rect.mnDestY;
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GLfloat fX2 = fX1 + r2Rect.mnDestWidth;
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GLfloat fY2 = fY1 + r2Rect.mnDestHeight;
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checkOverlapping(basegfx::B2DRange(fX1, fY1, fX2, fY2));
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GLuint nTextureId = rTexture.Id();
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RenderTextureParameters& rTextureParameter = maRenderEntries.back().maTextureParametersMap[nTextureId];
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rTextureParameter.maTexture = rTexture;
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rTexture.FillCoords<GL_TRIANGLES>(rTextureParameter.maTextureCoords, r2Rect, false);
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vcl::vertex::addRectangle<GL_TRIANGLES>(rTextureParameter.maVertices, fX1, fY1, fX2, fY2);
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vcl::vertex::addQuadColors<GL_TRIANGLES>(rTextureParameter.maColors, nColor, 0.0f);
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return true;
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}
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void RenderList::addDrawPolyLine(const basegfx::B2DPolygon& rPolygon, double fTransparency,
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const basegfx::B2DVector& rLineWidth, basegfx::B2DLineJoin eLineJoin,
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css::drawing::LineCap eLineCap, double fMiterMinimumAngle,
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SalColor nLineColor, bool bUseAA)
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{
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if (rPolygon.count() <= 1)
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return;
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if (nLineColor == SALCOLOR_NONE)
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return;
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if (fTransparency == 1.0)
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return;
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const bool bIsHairline = (rLineWidth.getX() == rLineWidth.getY()) && (rLineWidth.getX() <= 1.2);
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const float fLineWidth = bIsHairline ? 1.0f : rLineWidth.getX();
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basegfx::B2DPolygon aPolygon(rPolygon);
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if (rPolygon.areControlPointsUsed())
|
|
aPolygon = rPolygon.getDefaultAdaptiveSubdivision();
|
|
|
|
checkOverlapping(aPolygon.getB2DRange());
|
|
|
|
RenderParameters& rParameter = maRenderEntries.back().maLineParameters;
|
|
|
|
vcl::LineBuilder aBuilder(rParameter.maVertices, rParameter.maIndices,
|
|
nLineColor, fTransparency, fLineWidth, bUseAA);
|
|
|
|
appendPolyLine(aBuilder, aPolygon, eLineJoin, eLineCap, fMiterMinimumAngle);
|
|
}
|
|
|
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|