DIB セクション

DIB と DDB の相互参照

HBITMAP CreateDIBSection(
	HDC hdc ,
	CONST BITMAPINFO *pbmi ,
	UINT iUsage ,
	VOID *ppvBits ,
	HANDLE hSection ,
	DWORD dwOffset
);

#include <windows.h>

TCHAR strFileName[1024];
BITMAPFILEHEADER bmpFileHeader;
BITMAPINFO * bmpInfo;
BYTE * bPixelBits;
HBITMAP hBitmap;

LRESULT CALLBACK WndProc(HWND hWnd , UINT msg , WPARAM wp , LPARAM lp) {
	HDC hdc;
	HANDLE hFile;
	PAINTSTRUCT ps;
	DWORD dwBytes;
	static BITMAP bitmap;
	static HDC hBuffer;

	switch (msg) {
	case WM_DESTROY:
		free(bmpInfo);
		DeleteDC(hBuffer);
		DeleteObject(hBitmap);
		PostQuitMessage(0);
		return 0;
	case WM_CREATE:
		hdc = GetDC(hWnd);

		hBuffer = CreateCompatibleDC(hdc);
		SelectObject(hBuffer , hBitmap);
		GetObject(hBitmap , sizeof (BITMAP) , &bitmap);

		BitBlt(	hBuffer , 0 , 0 , bitmap.bmWidth , bitmap.bmHeight ,
			hBuffer , 0 , 0 , NOTSRCCOPY
		);
		InvalidateRect(hWnd , NULL , TRUE);

		ReleaseDC(hWnd , hdc);

		hFile = CreateFile(strFileName , GENERIC_WRITE , 0 , NULL ,
			CREATE_NEW , FILE_ATTRIBUTE_NORMAL , NULL);
		if (hFile == INVALID_HANDLE_VALUE) return 0;

		WriteFile(	hFile , &bmpFileHeader ,
			sizeof (BITMAPFILEHEADER) , &dwBytes , NULL);
		WriteFile(	hFile , bmpInfo ,
			bmpFileHeader.bfOffBits - sizeof (BITMAPFILEHEADER) ,
			&dwBytes , NULL);
		WriteFile( hFile , bPixelBits ,
			bmpFileHeader.bfSize - bmpFileHeader.bfOffBits ,
			&dwBytes , NULL);
		CloseHandle(hFile);
		return 0;
	case WM_PAINT:
		hdc = BeginPaint(hWnd , &ps);

		BitBlt(	hdc , 0 , 0 , bitmap.bmWidth , bitmap.bmHeight ,
			hBuffer , 0 , 0 , SRCCOPY
		);

		EndPaint(hWnd , &ps);
		return 0;
	}
	return DefWindowProc(hWnd , msg , wp , lp);
}

int WINAPI WinMain(HINSTANCE hInstance , HINSTANCE hPrevInstance ,
			PSTR lpCmdLine , int nCmdShow) {
	HWND hWnd;
	MSG msg;
	WNDCLASS winc;
	HANDLE hFile;
	DWORD dwBytes;

	hFile = CreateFile(lpCmdLine , GENERIC_READ , 0 , NULL ,
		OPEN_EXISTING , FILE_ATTRIBUTE_NORMAL , NULL);
	if (hFile == INVALID_HANDLE_VALUE) return 1;

	ReadFile(hFile , &bmpFileHeader , sizeof (BITMAPFILEHEADER) , &dwBytes , NULL);
	if (bmpFileHeader.bfType != 0x4D42) {
		MessageBox(NULL , TEXT("This is not a bitmap file") , NULL , MB_OK);
		return 1;
	}

	bmpInfo = (BITMAPINFO *) malloc (bmpFileHeader.bfOffBits - dwBytes);
	ReadFile(hFile , bmpInfo , bmpFileHeader.bfOffBits - dwBytes , &dwBytes , NULL);
	hBitmap = CreateDIBSection(
		NULL , bmpInfo , DIB_RGB_COLORS , &bPixelBits , NULL , 0
	);
	ReadFile(hFile ,bPixelBits ,
		bmpFileHeader.bfSize - bmpFileHeader.bfOffBits , &dwBytes , NULL);
	CloseHandle(hFile);

	*(lpCmdLine + lstrlen(lpCmdLine) - 4) = 0;
	wsprintf(strFileName , TEXT("%s_not.bmp") , lpCmdLine);

	winc.style 		= CS_HREDRAW | CS_VREDRAW;
	winc.lpfnWndProc	= WndProc;
	winc.cbClsExtra	= winc.cbWndExtra	= 0;
	winc.hInstance		= hInstance;
	winc.hIcon		= LoadIcon(NULL , IDI_APPLICATION);
	winc.hCursor		= LoadCursor(NULL , IDC_ARROW);
	winc.hbrBackground	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	winc.lpszMenuName	= NULL;
	winc.lpszClassName	= TEXT("KITTY");

	if (!RegisterClass(&winc)) return 1;

	hWnd = CreateWindow(
			TEXT("KITTY") , TEXT("Kitty on your lap") ,
			WS_OVERLAPPEDWINDOW | WS_VISIBLE ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			NULL , NULL , hInstance , NULL
	);

	if (hWnd == NULL) return 1;

	while (GetMessage(&msg , NULL , 0 , 0 )) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

typedef struct tagDIBSECTION { 
    BITMAP              dsBm; 
    BITMAPINFOHEADER    dsBmih; 
    DWORD               dsBitfields[3]; 
    HANDLE              dshSection; 
    DWORD               dsOffset; 
} DIBSECTION;

CreateDIBSection()

HBITMAP CreateDIBSection(
	HDC hdc ,
	CONST BITMAPINFO *pbmi ,
	UINT iUsage ,
	VOID *ppvBits ,
	HANDLE hSection ,
	DWORD dwOffset
);