Add path rasterizer

libraries/ZWidget/include/zwidget/core/pathfill.h

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <vector>
+#include "core/rect.h"
+
+/*
+// 3x3 transform matrix
+class PathFillTransform
+{
+public:
+	PathFillTransform() { for (int i = 0; i < 9; i++) matrix[i] = 0.0f; matrix[0] = matrix[4] = matrix[8] = 1.0; }
+	PathFillTransform(const float* mat3x3) { for (int i = 0; i < 9; i++) matrix[i] = (double)mat3x3[i]; }
+	PathFillTransform(const double* mat3x3) { for (int i = 0; i < 9; i++) matrix[i] = mat3x3[i]; }
+
+	double matrix[9];
+};
+*/
+
+enum class PathFillMode
+{
+	alternate,
+	winding
+};
+
+enum class PathFillCommand
+{
+	line,
+	quadradic,
+	cubic
+};
+
+class PathFillSubpath
+{
+public:
+	PathFillSubpath() : points(1) { }
+
+	std::vector<Point> points;
+	std::vector<PathFillCommand> commands;
+	bool closed = false;
+};
+
+class PathFillDesc
+{
+public:
+	PathFillDesc() : subpaths(1) { }
+
+	PathFillMode fill_mode = PathFillMode::alternate;
+	std::vector<PathFillSubpath> subpaths;
+
+	void MoveTo(const Point& point)
+	{
+		if (!subpaths.back().commands.empty())
+		{
+			subpaths.push_back(PathFillSubpath());
+		}
+		subpaths.back().points.front() = point;
+	}
+
+	void LineTo(const Point& point)
+	{
+		auto& subpath = subpaths.back();
+		subpath.points.push_back(point);
+		subpath.commands.push_back(PathFillCommand::line);
+	}
+
+	void BezierTo(const Point& control, const Point& point)
+	{
+		auto& subpath = subpaths.back();
+		subpath.points.push_back(control);
+		subpath.points.push_back(point);
+		subpath.commands.push_back(PathFillCommand::quadradic);
+	}
+
+	void BezierTo(const Point& control1, const Point& control2, const Point& point)
+	{
+		auto& subpath = subpaths.back();
+		subpath.points.push_back(control1);
+		subpath.points.push_back(control2);
+		subpath.points.push_back(point);
+		subpath.commands.push_back(PathFillCommand::cubic);
+	}
+
+	void Close()
+	{
+		if (!subpaths.back().commands.empty())
+		{
+			subpaths.back().closed = true;
+			subpaths.push_back(PathFillSubpath());
+		}
+	}
+
+	void Rasterize(uint8_t* dest, int width, int height, bool blend = false);
+};