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Tensor product patch shading

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Jakub Melka
2021-03-14 15:51:06 +01:00
parent c5165186ab
commit 325db87cd5
2 changed files with 222 additions and 16 deletions
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17
Pdf4QtLib/sources/pdfpattern.h
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@ -561,6 +561,18 @@ public:
/// \param derivativeOrderV Derivation order in direction v (0 means no derivation)
QPointF getValue(PDFReal u, PDFReal v, int derivativeOrderU, int derivativeOrderV) const;
/// Tries to find value (u,v) using Newton-Raphson numerical algorithm method.
/// This can fail and when it fails, false is returned. As initial point, input uv
/// is considered. Also, if maximal number of steps is reached, false is returned.
/// \param[in,out] u Output value of u (passed value is used as a seed)
/// \param[in,out] v Output value of v (passed value is used as a seed)
/// \param x Input x coordinate, for which we want to compute (u, v)
/// \param y Input y coordinate, for which we want to compute (u, v)
/// \param epsilon Epsilon, when distance from the getValue(u, v) and (x, y)
/// is less than epsilon, convergence is reached
/// \param maximalNumberOfSteps Maximal number of steps of Newton-Raphson algorithm
bool getUV(PDFReal& u, PDFReal& v, PDFReal x, PDFReal y, PDFReal epsilon, int maximalNumberOfSteps) const;
/// Calculates first derivate in the surface, in the direction of variable u.
/// \param u Horizontal coordinate of the patch, must be in range [0, 1]
/// \param v Vertical coordinate of the patch, must be in range [0, 1]
@ -653,6 +665,9 @@ class PDFTensorProductPatchShadingBase : public PDFType4567Shading
public:
explicit inline PDFTensorProductPatchShadingBase() = default;
virtual PDFShadingSampler* createSampler(QMatrix userSpaceToDeviceSpaceMatrix) const override;
virtual PDFTensorPatches createPatches(QMatrix userSpaceToDeviceSpaceMatrix, bool transformColor) const = 0;
protected:
struct Triangle;
@ -671,6 +686,7 @@ public:
virtual ShadingType getShadingType() const override;
virtual PDFMesh createMesh(const PDFMeshQualitySettings& settings, const PDFCMS* cms, RenderingIntent intent, PDFRenderErrorReporter* reporter) const override;
virtual PDFTensorPatches createPatches(QMatrix userSpaceToDeviceSpaceMatrix, bool transformColor) const override;
private:
friend class PDFPattern;
@ -683,6 +699,7 @@ public:
virtual ShadingType getShadingType() const override;
virtual PDFMesh createMesh(const PDFMeshQualitySettings& settings, const PDFCMS* cms, RenderingIntent intent, PDFRenderErrorReporter* reporter) const override;
virtual PDFTensorPatches createPatches(QMatrix userSpaceToDeviceSpaceMatrix, bool transformColor) const override;
private:
friend class PDFPattern;