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got rid of more duplicated code for working with DIBs

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19730 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2003-03-23 15:51:37 +00:00
parent 5cb0f77dfe
commit 22be0335df
3 changed files with 168 additions and 203 deletions
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154
src/msw/ole/dataobj.cpp
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@@ -757,23 +757,29 @@ const wxChar *wxDataObject::GetFormatName(wxDataFormat format)
size_t wxBitmapDataObject::GetDataSize() const
{
return wxConvertBitmapToDIB(NULL, GetBitmap());
return wxDIB::ConvertFromBitmap(NULL, GetHbitmapOf(GetBitmap()));
}
bool wxBitmapDataObject::GetDataHere(void *buf) const
{
return wxConvertBitmapToDIB((LPBITMAPINFO)buf, GetBitmap()) != 0;
BITMAPINFO * const pbi = (BITMAPINFO *)buf;
return wxDIB::ConvertFromBitmap(pbi, GetHbitmapOf(GetBitmap())) != 0;
}
bool wxBitmapDataObject::SetData(size_t WXUNUSED(len), const void *buf)
{
wxBitmap bitmap(wxConvertDIBToBitmap((const LPBITMAPINFO)buf));
const BITMAPINFO * const pbmi = (const BITMAPINFO *)buf;
if ( !bitmap.Ok() ) {
wxFAIL_MSG(wxT("pasting/dropping invalid bitmap"));
HBITMAP hbmp = wxDIB::ConvertToBitmap(pbmi);
return FALSE;
}
wxCHECK_MSG( hbmp, FALSE, wxT("pasting/dropping invalid bitmap") );
const BITMAPINFOHEADER * const pbmih = &pbmi->bmiHeader;
wxBitmap bitmap(pbmih->biWidth, pbmih->biHeight, pbmih->biBitCount);
bitmap.SetHBITMAP((WXHBITMAP)hbmp);
// TODO: create wxPalette if the bitmap has any
SetBitmap(bitmap);
@@ -1157,140 +1163,6 @@ void wxURLDataObject::SetURL(const wxString& url)
// private functions
// ----------------------------------------------------------------------------
static size_t wxGetNumOfBitmapColors(size_t bitsPerPixel)
{
switch ( bitsPerPixel )
{
case 1:
// monochrome bitmap, 2 entries
return 2;
case 4:
return 16;
case 8:
return 256;
case 24:
// may be used with 24bit bitmaps, but we don't use it here - fall
// through
case 16:
case 32:
// bmiColors not used at all with these bitmaps
return 0;
default:
wxFAIL_MSG( wxT("unknown bitmap format") );
return 0;
}
}
size_t wxConvertBitmapToDIB(LPBITMAPINFO pbi, const wxBitmap& bitmap)
{
wxASSERT_MSG( bitmap.Ok(), wxT("invalid bmp can't be converted to DIB") );
// shouldn't be selected into a DC or GetDIBits() would fail
wxASSERT_MSG( !bitmap.GetSelectedInto(),
wxT("can't copy bitmap selected into wxMemoryDC") );
// prepare all the info we need
BITMAP bm;
HBITMAP hbmp = (HBITMAP)bitmap.GetHBITMAP();
if ( !GetObject(hbmp, sizeof(bm), &bm) )
{
wxLogLastError(wxT("GetObject(bitmap)"));
return 0;
}
// calculate the number of bits per pixel and the number of items in
// bmiColors array (whose meaning depends on the bitmap format)
WORD biBits = bm.bmPlanes * bm.bmBitsPixel;
WORD biColors = (WORD)wxGetNumOfBitmapColors(biBits);
BITMAPINFO bi2;
bool wantSizeOnly = pbi == NULL;
if ( wantSizeOnly )
pbi = &bi2;
// just for convenience
BITMAPINFOHEADER& bi = pbi->bmiHeader;
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
// memory we need for BITMAPINFO only
DWORD dwLen = bi.biSize + biColors * sizeof(RGBQUAD);
// first get the image size
ScreenHDC hdc;
if ( !GetDIBits(hdc, hbmp, 0, bi.biHeight, NULL, pbi, DIB_RGB_COLORS) )
{
wxLogLastError(wxT("GetDIBits(NULL)"));
return 0;
}
if ( wantSizeOnly )
{
// size of the header + size of the image
return dwLen + bi.biSizeImage;
}
// and now copy the bits
void *image = (char *)pbi + dwLen;
if ( !GetDIBits(hdc, hbmp, 0, bi.biHeight, image, pbi, DIB_RGB_COLORS) )
{
wxLogLastError(wxT("GetDIBits"));
return 0;
}
return dwLen + bi.biSizeImage;
}
wxBitmap wxConvertDIBToBitmap(const LPBITMAPINFO pbmi)
{
// here we get BITMAPINFO struct followed by the actual bitmap bits and
// BITMAPINFO starts with BITMAPINFOHEADER followed by colour info
const BITMAPINFOHEADER *pbmih = &pbmi->bmiHeader;
// biClrUsed has the number of colors, unless it's 0
int numColors = pbmih->biClrUsed;
if (numColors==0)
{
numColors = wxGetNumOfBitmapColors(pbmih->biBitCount);
}
// offset of image from the beginning of the header
DWORD ofs = numColors * sizeof(RGBQUAD);
void *image = (char *)pbmih + sizeof(BITMAPINFOHEADER) + ofs;
ScreenHDC hdc;
HBITMAP hbmp = CreateDIBitmap(hdc, pbmih, CBM_INIT,
image, pbmi, DIB_RGB_COLORS);
if ( !hbmp )
{
wxLogLastError(wxT("CreateDIBitmap"));
}
wxBitmap bitmap(pbmih->biWidth, pbmih->biHeight, pbmih->biBitCount);
bitmap.SetHBITMAP((WXHBITMAP)hbmp);
return bitmap;
}
#ifdef __WXDEBUG__
static const wxChar *GetTymedName(DWORD tymed)