bitmap.h

#ifndef RENDER_BITMAP_H
#define RENDER_BITMAP_H

#include "common.h"

#define BMP_MAGIC 0x4d42
#define BMP_COLOR(r, g, b)                                                                                                                                                                             \
  &(RGBTRIPLE) { b, g, r }
#define BMP_GRAY_SCALE(v)                                                                                                                                                                              \
  &(RGBTRIPLE) { v, v, v }

#pragma pack(push)
#pragma pack(1)
typedef struct tagBITMAPFILEHEADER {
  uint16_t bfType;
  uint32_t bfSize;
  uint16_t bfReserved1;
  uint16_t bfReserved2;
  uint32_t bfOffBits;
} BITMAPFILEHEADER;

typedef struct tagBITMAPCOREHEADER {
  uint32_t bcSize;
  uint16_t bcWidth;
  uint16_t bcHeight;
  uint16_t bcPlanes;
  uint16_t bcBitCount;
} BITMAPCOREHEADER;

typedef struct tagRGBTRIPLE {
  uint8_t rgbtBlue;
  uint8_t rgbtGreen;
  uint8_t rgbtRed;
} RGBTRIPLE;
#pragma pack(pop)

typedef struct tagBitmap {
  BITMAPFILEHEADER fileHeader;
  BITMAPCOREHEADER dibHeader;
  RGBTRIPLE *pixels; // bottom-up
} Bitmap;

Bitmap *BitmapNewImage(uint16_t width, uint16_t height);
bool BitmapDestroy(Bitmap *bitmap);
bool BitmapWriteFile(const Bitmap *bitmap, const char *filename);
bool BitmapSetPixelColor(Bitmap *bitmap, uint16_t x, uint16_t y, const RGBTRIPLE *color);

#endif // RENDER_BITMAP_H