/////////////////////////////////////////////////////////////////////////////// 
// Copyright (C) 2002-2025, Open Design Alliance (the "Alliance"). 
// All rights reserved. 
// 
// This software and its documentation and related materials are owned by 
// the Alliance. The software may only be incorporated into application 
// programs owned by members of the Alliance, subject to a signed 
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable  
// trade secrets of the Alliance and its suppliers. The software is also 
// protected by copyright law and international treaty provisions. Application  
// programs incorporating this software must include the following statement 
// with their copyright notices:
//   
//   This application incorporates Open Design Alliance software pursuant to a license 
//   agreement with Open Design Alliance.
//   Open Design Alliance Copyright (C) 2002-2025 by Open Design Alliance. 
//   All rights reserved.
//
// By use of this software, its documentation or related materials, you 
// acknowledge and accept the above terms.
///////////////////////////////////////////////////////////////////////////////

#ifndef OD_SR_RASTERIZERS
#define OD_SR_RASTERIZERS

#include "SrRenderState.h"

// Forward declarations
class OdSrFrameContext;

// Helper structures and functions
struct OdSrVec2F
{
  float x;
  float y;
};

inline bool is_top_left(const OdSrVec2F& start, const OdSrVec2F& end)
{
  OdSrVec2F edge = { end.x - start.x, end.y - start.y };
  bool is_top_edge = edge.y == 0 && edge.x > 0;
  bool is_left_edge = edge.y < 0;
  return is_left_edge || is_top_edge;
}

inline float edge_cross(const OdSrVec2F& a, const OdSrVec2F& b, const OdSrVec2F& p)
{
  OdSrVec2F ab = { b.x - a.x, b.y - a.y };
  OdSrVec2F ap = { p.x - a.x, p.y - a.y };
  return ab.x * ap.y - ab.y * ap.x;
}

class OdSrFrameContext;
struct GsSrRenderState;

// Line rasterizer
class GsSrLineRasterizer
{
public:
  static void draw(OdSrFrameContext& context, GsSrRenderState& state, int x1, int y1, int x2, int y2, ODCOLORREF col);
};

// Triangle rasterizer
class GsSrTriangleRasterizer
{
public:
  static void draw(OdSrFrameContext& context, GsSrRenderState& state, int x1, int y1, int x2, int y2, int x3, int y3, ODCOLORREF col);
  static void drawMultiColor(OdSrFrameContext& context, GsSrRenderState& state, float x1, float y1, float x2, float y2, float x3, float y3, const ODCOLORREF* threeColors);
  static void drawClipping(OdSrFrameContext& context, GsSrRenderState& state, int x1, int y1, int x2, int y2, int x3, int y3);
};

// Circle rasterizer
class GsSrCircleRasterizer
{
public:
  static void drawOutline(OdSrFrameContext& context, GsSrRenderState& state, int centerX, int centerY, int radius);
  static void drawFilled(OdSrFrameContext& context, GsSrRenderState& state, int x, int y, double radius, ODCOLORREF color);
  static void drawFilledPrecise(OdSrFrameContext& context, GsSrRenderState& state, double cx, double cy, double radius, ODCOLORREF color);
};

// Ellipse rasterizer
class GsSrEllipseRasterizer
{
public:
  static void drawOutline(OdSrFrameContext& context, GsSrRenderState& state, int centerX, int centerY, int radiusMajor, int radiusMinor);
  static void drawFilled(OdSrFrameContext& context, GsSrRenderState& state, int centerX, int centerY, int radiusMajor, int radiusMinor);
};

#endif // OD_SR_RASTERIZERS