isle-portable/LEGO1/mxbitmap.cpp

#include "mxbitmap.h"

#include "decomp.h"

DECOMP_SIZE_ASSERT(MxBitmap, 0x20);
DECOMP_SIZE_ASSERT(MxBITMAPINFO, 0x428);

// Bitmap header magic string "BM" (42 4d)
// Sources: https://learn.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-bitmapfileheader, DirectX Complete
// (1998) GLOBAL: LEGO1 0x10102184
MxU16 g_bitmapSignature = TWOCC('B', 'M');

// OFFSET: LEGO1 0x100bc980
MxBitmap::MxBitmap()
{
	this->m_info = NULL;
	this->m_bmiHeader = NULL;
	this->m_paletteData = NULL;
	this->m_data = NULL;
	this->m_isHighColor = FALSE;
	this->m_palette = NULL;
}

// OFFSET: LEGO1 0x100bca10
MxBitmap::~MxBitmap()
{
	if (this->m_info)
		delete m_info;
	if (this->m_data)
		delete m_data;
	if (this->m_palette)
		delete m_palette;
}

// Bit mask trick to round up to the nearest multiple of four.
// Pixel data may be stored with padding.
// https://learn.microsoft.com/en-us/windows/win32/medfound/image-stride
inline MxLong AlignToFourByte(MxLong p_value)
{
	return (p_value + 3) & -4;
}

// Same as the one from legoutil.h, but flipped the other way
// TODO: While it's not outside the realm of possibility that they
// reimplemented Abs for only this file, that seems odd, right?
inline MxLong _Abs(MxLong p_value)
{
	return p_value > 0 ? p_value : -p_value;
}

// OFFSET: LEGO1 0x100bcc40
MxResult MxBitmap::ImportBitmap(MxBitmap* p_bitmap)
{
	MxResult result = FAILURE;

	this->m_info = new MxBITMAPINFO;
	if (this->m_info) {
		MxLong height = _Abs(p_bitmap->m_bmiHeader->biHeight);
		this->m_data = new MxU8[AlignToFourByte(p_bitmap->m_bmiHeader->biWidth) * height];
		if (this->m_data) {
			memcpy(this->m_info, p_bitmap->m_info, sizeof(*this->m_info));
			height = _Abs(p_bitmap->m_bmiHeader->biHeight);
			memcpy(this->m_data, p_bitmap->m_data, AlignToFourByte(p_bitmap->m_bmiHeader->biWidth) * height);

			result = SUCCESS;
			this->m_bmiHeader = &this->m_info->bmiHeader;
			this->m_paletteData = this->m_info->bmiColors;
		}
	}

	if (result != SUCCESS) {
		if (this->m_info) {
			delete this->m_info;
			this->m_info = NULL;
		}

		if (this->m_data) {
			delete this->m_data;
			this->m_data = NULL;
		}
	}

	return result;
}

// OFFSET: LEGO1 0x100bcba0
MxResult MxBitmap::ImportBitmapInfo(MxBITMAPINFO* p_info)
{
	MxResult result = FAILURE;
	MxLong width = p_info->bmiHeader.biWidth;
	MxLong height = p_info->bmiHeader.biHeight;
	MxLong size = AlignToFourByte(width) * height;

	this->m_info = new MxBITMAPINFO;
	if (this->m_info) {
		this->m_data = new MxU8[size];
		if (this->m_data) {
			memcpy(this->m_info, p_info, sizeof(*this->m_info));
			this->m_bmiHeader = &this->m_info->bmiHeader;
			this->m_paletteData = this->m_info->bmiColors;
			result = SUCCESS;
		}
	}

	if (result != SUCCESS) {
		if (this->m_info) {
			delete this->m_info;
			this->m_info = NULL;
		}

		if (this->m_data) {
			delete this->m_data;
			this->m_data = NULL;
		}
	}

	return result;
}

// OFFSET: LEGO1 0x100bd450
MxResult MxBitmap::ImportColorsToPalette(RGBQUAD* p_rgbquad, MxPalette* p_palette)
{
	MxResult ret = FAILURE;
	PALETTEENTRY entries[256];

	if (p_palette) {
		if (p_palette->GetEntries(entries))
			return ret;
	}
	else {
		MxPalette local_pal;
		if (local_pal.GetEntries(entries))
			return ret;
	}

	for (MxS32 i = 0; i < 256; i++) {
		p_rgbquad[i].rgbRed = entries[i].peRed;
		p_rgbquad[i].rgbGreen = entries[i].peGreen;
		p_rgbquad[i].rgbBlue = entries[i].peBlue;
		p_rgbquad[i].rgbReserved = 0;
	}

	ret = SUCCESS;
	return ret;
}

// OFFSET: LEGO1 0x100bcaa0
MxResult MxBitmap::SetSize(MxS32 p_width, MxS32 p_height, MxPalette* p_palette, MxBool p_isHighColor)
{
	MxResult ret = FAILURE;
	MxLong size = AlignToFourByte(p_width) * p_height;

	m_info = new MxBITMAPINFO;
	if (m_info) {
		m_data = new MxU8[size];
		if (m_data) {
			m_bmiHeader = &m_info->bmiHeader;
			m_paletteData = m_info->bmiColors;
			memset(&m_info->bmiHeader, 0, sizeof(m_info->bmiHeader));

			m_bmiHeader->biSize = sizeof(*m_bmiHeader); // should be 40 bytes
			m_bmiHeader->biWidth = p_width;
			m_bmiHeader->biHeight = p_height;
			m_bmiHeader->biPlanes = 1;
			m_bmiHeader->biBitCount = 8;
			m_bmiHeader->biCompression = 0;
			m_bmiHeader->biSizeImage = size;

			if (!ImportColorsToPalette(m_paletteData, p_palette)) {
				if (!SetBitDepth(p_isHighColor)) {
					ret = SUCCESS;
				}
			}
		}
	}

	if (ret) {
		if (m_info) {
			delete m_info;
			m_info = NULL;
		}

		if (m_data) {
			delete[] m_data;
			m_data = NULL;
		}
	}

	return ret;
}

// OFFSET: LEGO1 0x100bcd60
MxResult MxBitmap::LoadFile(HANDLE p_handle)
{
	MxResult result = FAILURE;
	DWORD bytesRead;
	BITMAPFILEHEADER hdr;

	BOOL ret = ReadFile(p_handle, &hdr, sizeof(hdr), &bytesRead, NULL);
	if (ret && (hdr.bfType == g_bitmapSignature)) {
		this->m_info = new MxBITMAPINFO;
		if (this->m_info) {
			ret = ReadFile(p_handle, this->m_info, sizeof(*this->m_info), &bytesRead, NULL);
			if (ret && (this->m_info->bmiHeader.biBitCount == 8)) {
				MxLong size = hdr.bfSize - (sizeof(MxBITMAPINFO) + sizeof(BITMAPFILEHEADER));
				this->m_data = new MxU8[size];
				if (this->m_data) {
					ret = ReadFile(p_handle, this->m_data, size, &bytesRead, NULL);
					if (ret) {
						this->m_bmiHeader = &this->m_info->bmiHeader;
						this->m_paletteData = this->m_info->bmiColors;
						if (this->m_info->bmiHeader.biSizeImage == 0) {
							MxLong height = _Abs(this->m_info->bmiHeader.biHeight);
							this->m_info->bmiHeader.biSizeImage =
								AlignToFourByte(this->m_info->bmiHeader.biWidth) * height;
						}
						result = SUCCESS;
					}
				}
			}
		}
	}

	if (result != SUCCESS) {
		if (this->m_info) {
			delete this->m_info;
			this->m_info = NULL;
		}

		if (this->m_data) {
			delete this->m_data;
			this->m_data = NULL;
		}
	}

	return result;
}

// OFFSET: LEGO1 0x100bcd10
MxLong MxBitmap::Read(const char* p_filename)
{
	MxResult result = FAILURE;
	HANDLE handle =
		CreateFileA(p_filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

	if (handle != INVALID_HANDLE_VALUE && !LoadFile(handle))
		result = SUCCESS;

	if (handle)
		CloseHandle(handle);

	return result;
}

// OFFSET: LEGO1 0x1004e0d0
int MxBitmap::vtable28(int)
{
	return -1;
}

// OFFSET: LEGO1 0x100bce70 STUB
void MxBitmap::vtable2c(int, int, int, int, int, int, int)
{
}

// OFFSET: LEGO1 0x100bd020 STUB
void MxBitmap::vtable30(int, int, int, int, int, int, int)
{
}

// OFFSET: LEGO1 0x100bd1c0
MxPalette* MxBitmap::CreatePalette()
{
	MxBool success = FALSE;
	MxPalette* palette = NULL;

	switch (this->m_isHighColor) {
	case FALSE:
		palette = new MxPalette(this->m_paletteData);
		if (palette)
			success = TRUE;
		break;

	case TRUE:
		palette = this->m_palette->Clone();
		if (palette)
			success = TRUE;
		break;
	}

	if (!success && palette) {
		delete palette;
		palette = NULL;
	}

	return palette;
}

// OFFSET: LEGO1 0x100bd280
void MxBitmap::ImportPalette(MxPalette* p_palette)
{
	// Odd to use a switch on a boolean, but it matches.
	switch (this->m_isHighColor) {
	case FALSE:
		ImportColorsToPalette(this->m_paletteData, p_palette);
		break;

	case TRUE:
		if (this->m_palette) {
			delete this->m_palette;
		}
		this->m_palette = p_palette->Clone();
		break;
	}
}

// OFFSET: LEGO1 0x100bd2d0
MxResult MxBitmap::SetBitDepth(MxBool p_isHighColor)
{
	MxResult ret = FAILURE;
	MxPalette* pal = NULL;

	if (m_isHighColor == p_isHighColor) {
		// no change: do nothing.
		ret = SUCCESS;
	}
	else {
		switch (p_isHighColor) {
		case FALSE:
			ImportColorsToPalette(m_paletteData, m_palette);
			if (m_palette)
				delete m_palette;

			m_palette = NULL;
			break;

		case TRUE:
			pal = NULL;
			pal = new MxPalette(m_paletteData);
			if (pal) {
				m_palette = pal;

				// TODO: what is this? zeroing out top half of palette?
				MxU16* buf = (MxU16*) m_paletteData;
				for (MxU16 i = 0; i < 256; i++) {
					buf[i] = i;
				}

				m_isHighColor = p_isHighColor;
				ret = SUCCESS;
			}
			break;
		}
	}

	// If we were unsuccessful overall but did manage to alloc
	// the MxPalette, free it.
	if (ret && pal)
		delete pal;

	return ret;
}

// OFFSET: LEGO1 0x100bd3e0
MxResult MxBitmap::StretchBits(
	HDC p_hdc,
	MxS32 p_xSrc,
	MxS32 p_ySrc,
	MxS32 p_xDest,
	MxS32 p_yDest,
	MxS32 p_destWidth,
	MxS32 p_destHeight
)
{
	// Compression fix?
	if ((this->m_bmiHeader->biCompression != BI_RGB_TOPDOWN) && (0 < this->m_bmiHeader->biHeight)) {
		p_ySrc = (this->m_bmiHeader->biHeight - p_destHeight) - p_ySrc;
	}

	return StretchDIBits(
		p_hdc,
		p_xDest,
		p_yDest,
		p_destWidth,
		p_destHeight,
		p_xSrc,
		p_ySrc,
		p_destWidth,
		p_destHeight,
		this->m_data,
		(BITMAPINFO*) this->m_info,
		this->m_isHighColor,
		SRCCOPY
	);
}