Image.h

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#pragma once
 
#include <stdint.h>
#include <vector>
#include <string>
 
#include "Vec4.h"
 
class Grid2D;

class Image {
public:
  uint32_t width;          
  uint32_t height;         
  uint8_t  componentCount; 
  std::vector<uint8_t> data; 

  Image(const Vec4& color);

  Image(uint32_t width = 100,
        uint32_t height = 100,
        uint8_t componentCount = 4);

  Image(uint32_t width,
        uint32_t height,
        uint8_t componentCount,
        std::vector<uint8_t> data);

  void multiply(const Vec4& color);

  void generateAlpha(uint8_t alpha=255);

  void generateAlphaFromLuminance();

  size_t computeIndex(uint32_t x, uint32_t y, uint8_t component) const;

  uint8_t getValue(uint32_t x, uint32_t y, uint8_t component) const;

  uint8_t sample(float x, float y, uint8_t component) const;

  uint8_t getLumiValue(uint32_t x, uint32_t y) const;

  void setValue(uint32_t x, uint32_t y, uint8_t component, uint8_t value);

  void setValue(uint32_t x, uint32_t y, uint8_t value);

  void setNormalizedValue(uint32_t x, uint32_t y, float value);

  void setNormalizedValue(uint32_t x, uint32_t y, uint8_t component, float value);

  std::string toCode(const std::string& varName="myImage", bool padding=false) const;

  std::string toACIIArt(bool bSmallTable=true) const;

  Image filter(const Grid2D& filter) const;

  Image toGrayscale() const;

  static Image genTestImage(uint32_t width,
                            uint32_t height);

  Image crop(uint32_t blX, uint32_t blY, uint32_t trX, uint32_t trY) const;

  Image resample(uint32_t newWidth) const;

  Image cropToAspectAndResample(uint32_t newWidth, uint32_t newHeight) const;

  Image flipHorizontal() const;

  Image flipVertical() const;
 
private:
  uint8_t linear(uint8_t a, uint8_t b, float alpha) const;
};