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Diffstat (limited to 'src/vg/Rasterizer.h')
| -rw-r--r-- | src/vg/Rasterizer.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/vg/Rasterizer.h b/src/vg/Rasterizer.h new file mode 100644 index 0000000..f1539a7 --- /dev/null +++ b/src/vg/Rasterizer.h @@ -0,0 +1,165 @@ +#ifndef __RASTERIZER_H +#define __RASTERIZER_H + +/*------------------------------------------------------------------------ + * + * OpenVG 1.1 Reference Implementation + * ----------------------------------- + * + * Copyright (c) 2007 The Khronos Group Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and /or associated documentation files + * (the "Materials "), to deal in the Materials without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Materials, + * and to permit persons to whom the Materials are furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Materials. + * + * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR + * THE USE OR OTHER DEALINGS IN THE MATERIALS. + * + *//** + * \file + * \brief Rasterizer class. + * \note + *//*-------------------------------------------------------------------*/ + +#include "Math.h" +#include "Array.h" +#include "PixelPipe.h" + +//======================================================================= + +namespace tgOpenVG +{ + +/*-------------------------------------------------------------------*//*! +* \brief Scalar and vector data types used by the rasterizer. +* \param +* \return +* \note +*//*-------------------------------------------------------------------*/ + +typedef RIfloat RScalar; //change this if you want to have different precision for rasterizer scalars and RIfloat + +struct RVector2 +{ + inline RVector2() { } + inline RVector2(const Vector2& v) { x = v.x; y = v.y; } + inline RVector2(RIfloat vx, RIfloat vy) { x = vx; y = vy; } + inline void set(RIfloat vx, RIfloat vy) { x = vx; y = vy; } + RScalar x; + RScalar y; +}; + +/*-------------------------------------------------------------------*//*! +* \brief Converts a set of edges to coverage values for each pixel and +* calls PixelPipe::pixelPipe for painting a pixel. +* \param +* \return +* \note +*//*-------------------------------------------------------------------*/ + +class Rasterizer +{ +public: + Rasterizer(); //throws bad_alloc + ~Rasterizer(); + + void setup(int vpx, int vpy, int vpwidth, int vpheight, VGFillRule fillRule, const PixelPipe* pixelPipe, RIuint32* covBuffer); + void setScissor(const Array<Rectangle>& scissors); //throws bad_alloc + + void clear(); + void addEdge(const Vector2& v0, const Vector2& v1); //throws bad_alloc + + int setupSamplingPattern(VGRenderingQuality renderingQuality, int numFSAASamples); + void fill(); //throws bad_alloc + + void getBBox(int& sx, int& sy, int& ex, int& ey) const { sx = m_covMinx; sy = m_covMiny; ex = m_covMaxx; ey = m_covMaxy; } +private: + Rasterizer(const Rasterizer&); //!< Not allowed. + const Rasterizer& operator=(const Rasterizer&); //!< Not allowed. + + struct ScissorEdge + { + ScissorEdge() : x(0), miny(0), maxy(0), direction(0) {} + bool operator<(const ScissorEdge& e) const { return x < e.x; } + int x; + int miny; + int maxy; + int direction; //1 start, -1 end + }; + + struct Edge + { + Edge() : v0(), v1(), direction(1) {} + bool operator<(const Edge& e) const { return v0.y < e.v0.y; } + RVector2 v0; + RVector2 v1; + int direction; + }; + + struct ActiveEdge + { + ActiveEdge() : v0(), v1(), direction(0), minx(0.0f), maxx(0.0f), n(), cnst(0.0f) {} + bool operator<(const ActiveEdge& e) const { return minx < e.minx; } + RVector2 v0; + RVector2 v1; + int direction; //-1 down, 1 up + RScalar minx; //for the current scanline + RScalar maxx; //for the current scanline + RVector2 n; + RScalar cnst; + }; + + struct Sample + { + Sample() : x(0.0f), y(0.0f), weight(0.0f) {} + RScalar x; + RScalar y; + RScalar weight; + }; + + void addBBox(const Vector2& v); + + Array<Edge> m_edges; + Array<ScissorEdge> m_scissorEdges; + bool m_scissor; + + Sample m_samples[RI_MAX_SAMPLES]; + int m_numSamples; + int m_numFSAASamples; + RScalar m_sumWeights; + RScalar m_sampleRadius; + + Vector2 m_edgeMin; + Vector2 m_edgeMax; + int m_covMinx; + int m_covMiny; + int m_covMaxx; + int m_covMaxy; + int m_vpx; + int m_vpy; + int m_vpwidth; + int m_vpheight; + VGFillRule m_fillRule; + const PixelPipe* m_pixelPipe; + RIuint32* m_covBuffer; +}; + +//======================================================================= + +} //namespace tgOpenVG + +//======================================================================= + +#endif /* __RASTERIZER_H */ |