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#pragma once
namespace DPIUtils
{
inline HICON PrepareIconForCaption(HICON a_hSource)
{
if (a_hSource == NULL)
return NULL;
ICONINFO tInfo;
ZeroMemory(&tInfo, sizeof tInfo);
GetIconInfo(a_hSource, &tInfo);
if (tInfo.hbmMask)
DeleteObject(tInfo.hbmMask);
if (tInfo.hbmColor == NULL)
return a_hSource;
BITMAP tBmp;
ZeroMemory(&tBmp, sizeof tBmp);
GetObject(tInfo.hbmColor, sizeof tBmp, &tBmp);
if (tBmp.bmBitsPixel != 32)
{
DeleteObject(tInfo.hbmColor);
return a_hSource; // do not bother low quality icons
}
static int nSmSizeX = GetSystemMetrics(SM_CXSMICON);
static int nSmSizeY = GetSystemMetrics(SM_CYSMICON);
if ((tBmp.bmWidth >= nSmSizeX || tBmp.bmHeight > nSmSizeY) &&
(tBmp.bmWidth > nSmSizeX || tBmp.bmHeight >= nSmSizeY))
{
DeleteObject(tInfo.hbmColor);
return a_hSource; // only fix smaller icons
}
CAutoVectorPtr<DWORD> pSource(new DWORD[tBmp.bmWidth*tBmp.bmHeight]);
if (0 == GetBitmapBits(tInfo.hbmColor, tBmp.bmWidth*tBmp.bmHeight<<2, pSource.m_p))
{
DeleteObject(tInfo.hbmColor);
return a_hSource; // failure
}
DeleteObject(tInfo.hbmColor);
DWORD nXOR = nSmSizeY*nSmSizeX<<2;
DWORD nAND = nSmSizeY*((((nSmSizeX+7)>>3)+3)&0xfffffffc);
CAutoVectorPtr<BYTE> pIconRes(new BYTE[nXOR+nAND+sizeof BITMAPINFOHEADER]);
ZeroMemory(pIconRes.m_p, nXOR+nAND+sizeof BITMAPINFOHEADER);
BITMAPINFOHEADER* pHead = reinterpret_cast<BITMAPINFOHEADER*>(pIconRes.m_p);
pHead->biSize = sizeof(BITMAPINFOHEADER);
pHead->biWidth = nSmSizeX;
pHead->biHeight = nSmSizeY<<1;
pHead->biPlanes = 1;
pHead->biBitCount = 32;
pHead->biCompression = BI_RGB;
pHead->biSizeImage = nXOR+nAND;
pHead->biXPelsPerMeter = 0;
pHead->biYPelsPerMeter = 0;
DWORD *pXOR = reinterpret_cast<DWORD *>(pIconRes+sizeof BITMAPINFOHEADER);
ULONG nRowDelta = nSmSizeX-tBmp.bmWidth;
pXOR += ((nSmSizeX-tBmp.bmWidth)>>1) + ((nSmSizeY-tBmp.bmHeight)>>1)*nSmSizeX;
DWORD* pXORSrc = pSource+tBmp.bmWidth*(tBmp.bmHeight-1);
for (int y = 0; y < tBmp.bmHeight; ++y)
{
for (int x = 0; x < tBmp.bmWidth; ++x)
{
*pXOR = *pXORSrc;
++pXORSrc;
++pXOR;
}
pXOR += nRowDelta;
pXORSrc -= tBmp.bmWidth<<1;
}
pXOR = reinterpret_cast<DWORD *>(pIconRes+sizeof BITMAPINFOHEADER);
BYTE *pAND = reinterpret_cast<BYTE*>(pXOR+(nSmSizeY*nSmSizeX));
int nANDLine = ((((nSmSizeX+7)>>3)+3)&0xfffffffc);
for (int y = 0; y < nSmSizeY; ++y)
{
for (int x = 0; x < nSmSizeX; ++x)
{
if (0 == (0xff000000&*pXOR))
{
pAND[x>>3] |= 0x80 >> (x&7);
}
++pXOR;
}
pAND += nANDLine;
}
HICON hTmp = CreateIconFromResourceEx(pIconRes.m_p, nXOR+nAND+sizeof BITMAPINFOHEADER, TRUE, 0x00030000, nSmSizeX, nSmSizeY, LR_DEFAULTCOLOR);
DestroyIcon(a_hSource);
return hTmp;
}
};
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