isle-portable/LEGO1/mxbitmap.h
2023-10-25 01:38:27 +02:00

79 lines
2.9 KiB
C++

#ifndef MXBITMAP_H
#define MXBITMAP_H
#include "mxcore.h"
#include "mxpalette.h"
#include "mxtypes.h"
#include <stdlib.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];
};
// Non-standard value for biCompression in the BITMAPINFOHEADER struct.
// By default, uncompressed bitmaps (BI_RGB) are stored in bottom-up order.
// You can specify that the bitmap has top-down order instead by providing
// a negative number for biHeight. It could be that Mindscape decided on a
// belt & suspenders approach here.
#define BI_RGB_TOPDOWN 0x10
// 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; }
inline MxLong GetBmiWidth() const { return m_bmiHeader->biWidth; }
inline MxLong GetBmiHeight() const { return m_bmiHeader->biHeight; }
inline MxLong GetBmiHeightAbs() const
{
return m_bmiHeader->biHeight > 0 ? m_bmiHeader->biHeight : -m_bmiHeader->biHeight;
}
inline MxU8* GetBitmapData() const { return m_data; }
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