isle-portable/LEGO1/mxbitmap.h

#ifndef MXBITMAP_H
#define MXBITMAP_H

#include <stdlib.h>

#include "mxcore.h"
#include "mxpalette.h"
#include "mxtypes.h"

// The stock BITMAPINFO struct from wingdi.h only makes room for one color
// in the palette. It seems like the expectation (if you use the struct)
// is to malloc as much as you actually need, and then index into the array
// anyway even though its stated size is [1].
// https://learn.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-bitmapinfo
// In our case, the size 0x428 is used frequently, which matches
// a 40-byte header plus 256 colors, so just use that as our template.

// SIZE 0x428
struct MxBITMAPINFO {
  BITMAPINFOHEADER    bmiHeader;
  RGBQUAD             bmiColors[256];
};

// SIZE 0x20
// VTABLE 0x100dc7b0
class MxBitmap : public MxCore
{
public:
  __declspec(dllexport) MxBitmap();
  __declspec(dllexport) virtual ~MxBitmap(); // vtable+00

  virtual MxResult ImportBitmap(MxBitmap *p_bitmap); // vtable+14
  virtual MxResult ImportBitmapInfo(MxBITMAPINFO *p_info); // vtable+18
  virtual MxResult SetSize(MxS32 p_width, MxS32 p_height, MxPalette *p_palette, MxBool); // vtable+1c
  virtual MxResult LoadFile(HANDLE p_handle); // vtable+20
  __declspec(dllexport) virtual MxLong Read(const char *p_filename); // vtable+24
  virtual int vtable28(int);
  virtual void vtable2c(int, int, int, int, int, int, int);
  virtual void vtable30(int, int, int, int, int, int, int);
  __declspec(dllexport) virtual MxPalette *CreatePalette(); // vtable+34
  virtual void ImportPalette(MxPalette* p_palette); // vtable+38
  virtual MxResult SetBitDepth(MxBool); // vtable+3c
  virtual MxResult StretchBits(HDC p_hdc, MxS32 p_xSrc, MxS32 p_ySrc, MxS32 p_xDest, MxS32 p_yDest, MxS32 p_destWidth, MxS32 p_destHeight); // vtable+40

  inline BITMAPINFOHEADER *GetBmiHeader() const { return m_bmiHeader; }

private:
  MxResult ImportColorsToPalette(RGBQUAD*, MxPalette*);

  MxBITMAPINFO *m_info; // 0x8
  BITMAPINFOHEADER *m_bmiHeader; // 0xc
  RGBQUAD *m_paletteData; // 0x10
  MxU8 *m_data; // 0x14
  MxBool m_isHighColor; // 0x18
  MxPalette *m_palette; // 0x1c
};

#endif // MXBITMAP_H