IconBitmapUtils.h

// sktoolslib - common files for SK tools

// Copyright (C) 2013, 2020 - Stefan Kueng

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#pragma once
#include <map>

#pragma warning(push)
#pragma warning(disable : 4458) // declaration of 'xx' hides class member
#include <GdiPlus.h>
#pragma warning(pop)
#include <Uxtheme.h>

/**
 * \ingroup utils
 * provides helper functions for converting icons to bitmaps
 */
class IconBitmapUtils
{
public:
    IconBitmapUtils(void);
    ~IconBitmapUtils(void);

    HBITMAP IconToBitmap(HINSTANCE hInst, UINT uIcon);
    HBITMAP IconToBitmapPARGB32(HICON hIcon);
    HBITMAP IconToBitmapPARGB32(HINSTANCE hInst, UINT uIcon);
    HRESULT Create32BitHBITMAP(HDC hdc, const SIZE* psize, __deref_opt_out void** ppvBits, __out HBITMAP* phBmp);
    HRESULT ConvertBufferToPARGB32(HPAINTBUFFER hPaintBuffer, HDC hdc, HICON hicon, SIZE& sizIcon);
    bool    HasAlpha(__in Gdiplus::ARGB* pargb, SIZE& sizImage, int cxRow);
    HRESULT ConvertToPARGB32(HDC hdc, __inout Gdiplus::ARGB* pargb, HBITMAP hbmp, SIZE& sizImage, int cxRow);

private:
    std::map<UINT, HBITMAP> bitmaps;
};