#include<windows.h>
#include"bmp_io.h"

BMP_IO::BMP_IO()
{
	lpPixel=NULL;
}

BMP_IO::~BMP_IO()
{
	DeleteObject(hdcBMP);
}

BOOL BMP_IO::bmp_in(LPCTSTR file_name,HWND hWnd)
{
	fhBMP=CreateFile(file_name,GENERIC_READ,0,NULL,
		OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
	if(fhBMP==INVALID_HANDLE_VALUE){
		MessageBox(hWnd,"ファイルが開けません","エラー",MB_OK);
		return FALSE;
	}
	iFileSize=GetFileSize(fhBMP,NULL);
	lpBMP=(LPBYTE)HeapAlloc(GetProcessHeap(),0,iFileSize);
	ReadFile(fhBMP,lpBMP,iFileSize,&dwRead,NULL);
	CloseHandle(fhBMP);

	lpbmpfh=(LPBITMAPFILEHEADER)(lpBMP);
	lpbiBMPInfo=(LPBITMAPINFO)(lpBMP+sizeof(BITMAPFILEHEADER));
	if(lpbmpfh->bfType!=('M'<<8)+'B' || lpbiBMPInfo->bmiHeader.biBitCount!=8){
   		MessageBox(hWnd,"8ビットBMPファイルしか読み込めません","エラー",MB_OK);
		HeapFree(GetProcessHeap(),0,lpBMP);
		return FALSE;
	}
	iOffset=lpbmpfh->bfOffBits;
	lpBMPPixel=lpBMP+iOffset;
	dwColors=(LPDWORD)lpbiBMPInfo->bmiColors;
	iWidth=lpbiBMPInfo->bmiHeader.biWidth;
	iHeight=lpbiBMPInfo->bmiHeader.biHeight;

	biInfo.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
	biInfo.bmiHeader.biWidth=iWidth;
	biInfo.bmiHeader.biHeight=iHeight;
	biInfo.bmiHeader.biPlanes=1;
	biInfo.bmiHeader.biBitCount=32;
	biInfo.bmiHeader.biCompression=BI_RGB;

	if(lpPixel!=NULL)
		DeleteObject(hdcBMP);

	hdc=GetDC(hWnd);
	hBMP=CreateDIBSection(hdc,&biInfo,DIB_RGB_COLORS,
		(LPVOID *)(&lpPixel),NULL,0);
	hdcBMP=CreateCompatibleDC(hdc);
	SelectObject(hdcBMP,hBMP);

	ReleaseDC(hWnd,hdc);
	DeleteObject(hBMP);

	for(y=0;y