git subrepo clone https://github.com/HarbourMasters/ZAPDTR.git

subrepo:
  subdir:   "ZAPDTR"
  merged:   "a53a53ea4"
upstream:
  origin:   "https://github.com/HarbourMasters/ZAPDTR.git"
  branch:   "master"
  commit:   "a53a53ea4"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

ZAPDTR/ZAPD/ImageBackend.h

@@ -0,0 +1,71 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+#include "Utils/Directory.h"
+
+class RGBAPixel
+{
+public:
+	RGBAPixel() = default;
+
+	void SetRGBA(uint8_t nR, uint8_t nG, uint8_t nB, uint8_t nA);
+	void SetGrayscale(uint8_t grayscale, uint8_t alpha = 0);
+
+	uint8_t r = 0;
+	uint8_t g = 0;
+	uint8_t b = 0;
+	uint8_t a = 0;
+};
+
+class ImageBackend
+{
+public:
+	ImageBackend() = default;
+	~ImageBackend();
+
+	void ReadPng(const char* filename);
+	void ReadPng(const fs::path& filename);
+	void WritePng(const char* filename);
+	void WritePng(const fs::path& filename);
+
+	void SetTextureData(const std::vector<std::vector<RGBAPixel>>& texData, uint32_t nWidth,
+	                    uint32_t nHeight, uint8_t nColorType, uint8_t nBitDepth);
+	void InitEmptyRGBImage(uint32_t nWidth, uint32_t nHeight, bool alpha);
+	void InitEmptyPaletteImage(uint32_t nWidth, uint32_t nHeight);
+
+	RGBAPixel GetPixel(size_t y, size_t x) const;
+	uint8_t GetIndexedPixel(size_t y, size_t x) const;
+
+	void SetRGBPixel(size_t y, size_t x, uint8_t nR, uint8_t nG, uint8_t nB, uint8_t nA = 0);
+	void SetGrayscalePixel(size_t y, size_t x, uint8_t grayscale, uint8_t alpha = 0);
+
+	void SetIndexedPixel(size_t y, size_t x, uint8_t index, uint8_t grayscale);
+	void SetPaletteIndex(size_t index, uint8_t nR, uint8_t nG, uint8_t nB, uint8_t nA);
+	void SetPalette(const ImageBackend& pal);
+
+	uint32_t GetWidth() const;
+	uint32_t GetHeight() const;
+	uint8_t GetColorType() const;
+	uint8_t GetBitDepth() const;
+
+protected:
+	uint8_t** pixelMatrix = nullptr;  // height * [width * bytePerPixel]
+
+	void* colorPalette = nullptr;
+	uint8_t* alphaPalette = nullptr;
+	size_t paletteSize = 16 * 16;
+
+	uint32_t width = 0;
+	uint32_t height = 0;
+	uint8_t colorType = 0;
+	uint8_t bitDepth = 0;
+
+	bool hasImageData = false;
+	bool isColorIndexed = false;
+
+	double GetBytesPerPixel() const;
+
+	void FreeImageData();
+};