pdf/engine/include/pdfengine/graphics_state.hpp

#pragma once

#include <vector>
#include <stdexcept>

namespace pdfengine {

struct Matrix {
    float a = 1.0f, b = 0.0f;
    float c = 0.0f, d = 1.0f;
    float e = 0.0f, f = 0.0f;

    Matrix() = default;
    Matrix(float _a, float _b, float _c, float _d, float _e, float _f)
        : a(_a), b(_b), c(_c), d(_d), e(_e), f(_f) {}

    [[nodiscard]] Matrix multiply(const Matrix& other) const noexcept;

    void transform(float& x, float& y) const noexcept;
};

struct Color {
    float r = 0.0f;
    float g = 0.0f;
    float b = 0.0f;
};

struct GraphicsState {
    Matrix ctm;
    Color fillColor;
    Color strokeColor;
    float lineWidth = 1.0f;
    
};

class GraphicsStateStack {
public:
    GraphicsStateStack();

    void push();

    void pop();

    [[nodiscard]] GraphicsState& current();
    [[nodiscard]] const GraphicsState& current() const;

private:
    std::vector<GraphicsState> m_stack;
};

}