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added wxBitmapToHICON/CURSOR helper functions

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19716 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2003-03-22 23:47:06 +00:00
parent d1bf777402
commit 211b54b109
2 changed files with 84 additions and 2 deletions
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11
include/wx/msw/private.h
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@ -279,6 +279,17 @@ extern void PixelToHIMETRIC(LONG *x, LONG *y);
// to invert the mask each time we pass one/get one to/from Windows
extern HBITMAP wxInvertMask(HBITMAP hbmpMask, int w = 0, int h = 0);
// Creates an icon or cursor depending from a bitmap
//
// The bitmap must be valid and it should have a mask. If it doesn't, a default
// mask is created using light grey as the transparent colour.
extern HICON wxBitmapToHICON(const wxBitmap& bmp);
// Same requirments as above apply and the bitmap must also have the correct
// size.
extern
HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY);
// get (x, y) from DWORD - notice that HI/LOWORD can *not* be used because they
// will fail on system with multiple monitors where the coords may be negative
//

75
src/msw/bitmap.cpp
View File

@ -1580,10 +1580,81 @@ void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
#endif
// ----------------------------------------------------------------------------
// other helper functions
// global helper functions implemented here
// ----------------------------------------------------------------------------
extern HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
// helper of wxBitmapToHICON/HCURSOR
static
HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
bool iconWanted,
int hotSpotX,
int hotSpotY)
{
if ( !bmp.Ok() )
{
// we can't create an icon/cursor form nothing
return 0;
}
wxMask *mask = bmp.GetMask();
if ( !mask )
{
// we must have a mask for an icon, so even if it's probably incorrect,
// do create it (grey is the "standard" transparent colour)
mask = new wxMask(bmp, *wxLIGHT_GREY);
}
ICONINFO iconInfo;
iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
if ( !iconWanted )
{
iconInfo.xHotspot = hotSpotX;
iconInfo.yHotspot = hotSpotY;
}
iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
iconInfo.hbmColor = GetHbitmapOf(bmp);
// black out the transparent area to preserve background colour, because
// Windows blits the original bitmap using SRCINVERT (XOR) after applying
// the mask to the dest rect.
{
MemoryHDC dcSrc, dcDst;
SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
selectBitmap(dcDst, iconInfo.hbmColor);
if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
dcSrc, 0, 0, SRCAND) )
{
wxLogLastError(_T("BitBlt"));
}
}
HICON hicon = ::CreateIconIndirect(&iconInfo);
if ( !bmp.GetMask() )
{
// we created the mask, now delete it
delete mask;
}
// delete the inverted mask bitmap we created as well
::DeleteObject(iconInfo.hbmMask);
return hicon;
}
HICON wxBitmapToHICON(const wxBitmap& bmp)
{
return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
}
HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
{
return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
}
HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
{
#ifndef __WXMICROWIN__
wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );