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Sampler for lattice form gourad triangle shading

This commit is contained in:
Jakub Melka 2021-03-13 16:52:34 +01:00
parent 995a3cdd7a
commit c5165186ab
2 changed files with 86 additions and 18 deletions
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88
Pdf4QtLib/sources/pdfpattern.cpp
View File

@ -2307,11 +2307,12 @@ ShadingType PDFLatticeFormGouradTriangleShading::getShadingType() const
return ShadingType::LatticeFormGouradTriangle;
}
PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySettings& settings, const PDFCMS* cms, RenderingIntent intent, PDFRenderErrorReporter* reporter) const
bool PDFLatticeFormGouradTriangleShading::processTriangles(InitializeFunction initializeMeshFunction,
AddTriangleFunction addTriangle,
const QMatrix& userSpaceToDeviceSpaceMatrix,
bool convertColors) const
{
PDFMesh mesh;
QMatrix patternSpaceToDeviceSpaceMatrix = getPatternSpaceToDeviceSpaceMatrix(settings);
QMatrix patternSpaceToDeviceSpaceMatrix = getPatternSpaceToDeviceSpaceMatrix(userSpaceToDeviceSpaceMatrix);
size_t bitsPerVertex = 2 * m_bitsPerCoordinate + m_colorComponentCount * m_bitsPerComponent;
size_t remainder = (8 - (bitsPerVertex % 8)) % 8;
bitsPerVertex += remainder;
@ -2323,20 +2324,12 @@ PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySett
if (rowCount < 2)
{
// No mesh produced
return mesh;
return false;
}
// We have 2 triangles for each quad. We have (columnCount - 1) quads
// in single line and we have (rowCount - 1) lines.
size_t triangleCount = (rowCount - 1) * (columnCount - 1) * 2;
mesh.reserve(0, triangleCount);
struct VertexData
{
uint32_t index = 0;
QPointF position;
PDFColor color;
};
const PDFReal vertexScaleRatio = 1.0 / double((static_cast<uint64_t>(1) << m_bitsPerCoordinate) - 1);
const PDFReal xScaleRatio = (m_xmax - m_xmin) * vertexScaleRatio;
@ -2348,7 +2341,7 @@ PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySett
std::vector<QPointF> meshVertices;
meshVertices.resize(vertexCount);
auto readVertex = [this, &vertices, &patternSpaceToDeviceSpaceMatrix, &meshVertices, bytesPerVertex, xScaleRatio, yScaleRatio, colorScaleRatio](size_t index)
auto readVertex = [this, &vertices, &patternSpaceToDeviceSpaceMatrix, &meshVertices, bytesPerVertex, xScaleRatio, yScaleRatio, colorScaleRatio, convertColors](size_t index)
{
PDFBitReader reader(&m_data, 8);
reader.seek(index * bytesPerVertex);
@ -2368,14 +2361,17 @@ PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySett
data.color[i] = cMin + (reader.read(m_bitsPerComponent)) * (cMax - cMin) * colorScaleRatio;
}
data.color = getColor(data.color);
if (convertColors)
{
data.color = getColor(data.color);
}
vertices[index] = qMove(data);
};
PDFIntegerRange indices(size_t(0), vertexCount);
PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Content, indices.begin(), indices.end(), readVertex);
mesh.setVertices(qMove(meshVertices));
initializeMeshFunction(qMove(meshVertices), triangleCount);
auto getVertexIndex = [columnCount](size_t row, size_t column) -> size_t
{
@ -2396,11 +2392,38 @@ PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySett
const VertexData& vertexBottomRight = vertices[vBottomRight];
const VertexData& vertexBottomLeft = vertices[vBottomLeft];
addSubdividedTriangles(settings, mesh, vertexTopLeft.index, vertexTopRight.index, vertexBottomRight.index, vertexTopLeft.color, vertexTopRight.color, vertexBottomRight.color, cms, intent, reporter);
addSubdividedTriangles(settings, mesh, vertexBottomRight.index, vertexBottomLeft.index, vertexTopLeft.index, vertexBottomRight.color, vertexBottomLeft.color, vertexTopLeft.color, cms, intent, reporter);
addTriangle(&vertexTopLeft, &vertexTopRight, &vertexBottomRight);
addTriangle(&vertexBottomRight, &vertexBottomLeft, &vertexTopLeft);
}
}
return true;
}
PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySettings& settings, const PDFCMS* cms, RenderingIntent intent, PDFRenderErrorReporter* reporter) const
{
PDFMesh mesh;
auto addTriangle = [this, &settings, &mesh, cms, intent, reporter](const VertexData* va, const VertexData* vb, const VertexData* vc)
{
const uint32_t via = va->index;
const uint32_t vib = vb->index;
const uint32_t vic = vc->index;
addSubdividedTriangles(settings, mesh, via, vib, vic, va->color, vb->color, vc->color, cms, intent, reporter);
};
auto initializeMeshFunction = [&mesh](std::vector<QPointF>&& vertices, size_t triangleCount)
{
mesh.reserve(0, triangleCount);
mesh.setVertices(qMove(vertices));
};
if (!processTriangles(initializeMeshFunction, addTriangle, settings.userSpaceToDeviceSpaceMatrix, true))
{
throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid lattice form gourad triangle data stream."));
}
if (m_backgroundColor.isValid())
{
QPainterPath path;
@ -2412,6 +2435,35 @@ PDFMesh PDFLatticeFormGouradTriangleShading::createMesh(const PDFMeshQualitySett
return mesh;
}
PDFShadingSampler* PDFLatticeFormGouradTriangleShading::createSampler(QMatrix userSpaceToDeviceSpaceMatrix) const
{
PDFTriangleShadingSampler* sampler = new PDFTriangleShadingSampler(this, userSpaceToDeviceSpaceMatrix);
auto addTriangle = [sampler](const VertexData* va, const VertexData* vb, const VertexData* vc)
{
const uint32_t via = va->index;
const uint32_t vib = vb->index;
const uint32_t vic = vc->index;
sampler->addTriangle({ via, vib, vic }, { va->color, vb->color, vc->color });
};
auto initializeMeshFunction = [sampler](std::vector<QPointF>&& vertices, size_t triangleCount)
{
sampler->setVertexArray(qMove(vertices));
sampler->reserveSpaceForTriangles(triangleCount);
};
if (!processTriangles(initializeMeshFunction, addTriangle, userSpaceToDeviceSpaceMatrix, false))
{
// Just delete the sampler, data are invalid
delete sampler;
sampler = nullptr;
}
return sampler;
}
PDFColor PDFType4567Shading::getColor(PDFColor colorOrFunctionParameter) const
{
if (!m_functions.empty())

16
Pdf4QtLib/sources/pdfpattern.h
View File

@ -509,10 +509,26 @@ public:
virtual ShadingType getShadingType() const override;
virtual PDFMesh createMesh(const PDFMeshQualitySettings& settings, const PDFCMS* cms, RenderingIntent intent, PDFRenderErrorReporter* reporter) const override;
virtual PDFShadingSampler* createSampler(QMatrix userSpaceToDeviceSpaceMatrix) const override;
private:
friend class PDFPattern;
struct VertexData
{
uint32_t index = 0;
QPointF position;
PDFColor color;
};
using InitializeFunction = std::function<void(std::vector<QPointF>&&, size_t)>;
using AddTriangleFunction = std::function<void(const VertexData*, const VertexData*, const VertexData*)>;
bool processTriangles(InitializeFunction initializeMeshFunction,
AddTriangleFunction addTriangle,
const QMatrix& userSpaceToDeviceSpaceMatrix,
bool convertColors) const;
PDFInteger m_verticesPerRow = 0;
};