ツールバーに256色(8bit)の画像を使用する

ツールバーは通常4bit16色の画像以外を使用すると
正しく表示されません。
ですのでそれを修正したCExtToolBarを作成しました。

面倒くさいので説明はしませんが、
下記と同様なクラスを作成し、
LoadToolBarを呼ぶ代わりにLoadExtToolBarを呼んでください。

//ExtToolBar.cpp

#include "stdafx.h"
#include "ExtToolBar.h"

struct CToolBarData
{
	WORD wVersion;
	WORD wWidth;
	WORD wHeight;
	WORD wItemCount;
	//WORD aItems[wItemCount]

	WORD* items()
		{ return (WORD*)(this+1); }
};

IMPLEMENT_DYNAMIC(CExtToolBar, CToolBar)
CExtToolBar::CExtToolBar()
{
}

CExtToolBar::~CExtToolBar()
{
}

BEGIN_MESSAGE_MAP(CExtToolBar, CToolBar)
END_MESSAGE_MAP()

BOOL CExtToolBar::LoadExtToolBar(UINT nIDResource)
{
	return LoadExtToolBar(MAKEINTRESOURCE(nIDResource));
}

BOOL CExtToolBar::LoadExtToolBar(LPCTSTR lpszResourceName)
{
	switch( GetBitCount( lpszResourceName ) )
	{
	case 8:
		return LoadExtToolBarNot4( lpszResourceName, ILC_COLOR8 );
	}
	return LoadToolBar( lpszResourceName );
}

BOOL CExtToolBar::LoadExtToolBarNot4( LPCTSTR lpszResourceName, int depth )
{
	CImageList		img;
	CBitmap			bmp;
	HIMAGELIST		himg;
	HBITMAP			hbmp;
	int				i;
	UINT			*pItems;
	BOOL			bResult;


	HINSTANCE hInst = AfxFindResourceHandle(lpszResourceName, RT_TOOLBAR);
	HRSRC hRsrc = ::FindResource(hInst, lpszResourceName, RT_TOOLBAR);
	if (hRsrc == NULL)
		return FALSE;

	HGLOBAL hGlobal = LoadResource(hInst, hRsrc);
	if (hGlobal == NULL)
		return FALSE;

	CToolBarData* pData = (CToolBarData*)LockResource(hGlobal);
	if (pData == NULL)
		return FALSE;
	ASSERT(pData->wVersion == 1);

	himg	= ImageList_Create( 16, 15, depth | ILC_MASK, 0, 32 );
	bmp.LoadBitmap( lpszResourceName );
	hbmp	= (HBITMAP)bmp.GetSafeHandle();
	ImageList_AddMasked( himg, hbmp, RGB(192,192,192) );
	img.Attach( himg );
	GetToolBarCtrl().SetImageList( &img );
	img.Detach();
	DeleteObject( himg );
	bmp.DeleteObject();
	SetSizes( CSize(16 + 7,15 + 6), CSize(16,15) );
	pItems	= new UINT[pData->wItemCount];
	for( i = 0; i < (int)pData->wItemCount; i++ )
	{
		pItems[i]	= pData->items()[i];
	}
	bResult	= SetButtons( pItems, pData->wItemCount );

	UnlockResource(hGlobal);
	FreeResource(hGlobal);
	delete[] pItems;

	return TRUE;
}

int CExtToolBar::GetBitCount(UINT nIDResource)
{
	return GetBitCount(MAKEINTRESOURCE(nIDResource));
}

int CExtToolBar::GetBitCount( LPCTSTR lpszResourceName )
{
	HINSTANCE	hInst = AfxFindResourceHandle(lpszResourceName,RT_BITMAP);
	HRSRC		hRsrc = ::FindResource(hInst,lpszResourceName,RT_BITMAP);
	int			bitcount;


	if (hRsrc == NULL){
		hInst = NULL;
		hRsrc = ::FindResource(hInst,lpszResourceName,RT_BITMAP);
	}
	if (hRsrc == NULL)return 0;

	// determine how many colors in the bitmap
	HGLOBAL hglb;
	if ((hglb = LoadResource(hInst, hRsrc)) == NULL)
		return 0;
	LPBITMAPINFOHEADER lpBitmap = (LPBITMAPINFOHEADER)LockResource(hglb);
	if (lpBitmap == NULL)return 0;
	bitcount	= lpBitmap->biBitCount;
	::FreeResource(hglb);

	return bitcount;
}

//CExtToolBar.h

#pragma once


// CExtToolBar

class CExtToolBar : public CToolBar
{
	DECLARE_DYNAMIC(CExtToolBar)

public:
	CExtToolBar();
	virtual ~CExtToolBar();

protected:
	DECLARE_MESSAGE_MAP()

protected:
	BOOL LoadExtToolBarNot4( LPCTSTR lpszResourceName, int depth );

public:
	BOOL LoadExtToolBar(UINT nIDResource);
	BOOL LoadExtToolBar(LPCTSTR lpszResourceName);
	int GetBitCount( UINT nIDResource );
	int GetBitCount( LPCTSTR lpszResourceName );
};