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[CLIPBRD]

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Fix the computation of where bitmap pixels start, depending on whether we are dealing with DIBs or DIBs version 5+ (depending on the header BITMAPINFOHEADER or BITMAPV5HEADER etc...).
I also noticed a bug in Windows that few other people already discovered, related to the automatic conversion of CF_DIBV5/CF_BITMAP to CF_DIB clipboard format. See the comment in the code.
CORE-10679

svn path=/trunk/; revision=70349
This commit is contained in:
Hermès Bélusca-Maïto 2015-12-15 02:54:24 +00:00
parent 830c4ee4a0
commit e0b85f16d3
1 changed files with 86 additions and 7 deletions
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93
reactos/base/applications/clipbrd/winutils.c
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@ -16,7 +16,7 @@ void ShowLastWin32Error(HWND hwndParent)
dwError = GetLastError();
FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL, dwError, 0, (LPWSTR)&lpMsgBuf, 0, NULL);
NULL, dwError, 0, (LPWSTR)&lpMsgBuf, 0, NULL);
MessageBoxW(hwndParent, lpMsgBuf, NULL, MB_OK | MB_ICONERROR);
LocalFree(lpMsgBuf);
}
@ -102,8 +102,9 @@ void SetDIBitsToDeviceFromClipboard(UINT uFormat, HDC hdc, int XDest, int YDest,
{
LPBITMAPINFOHEADER lpInfoHeader;
LPBYTE lpBits;
LONG bmWidth, bmHeight;
DWORD dwPalSize = 0;
HGLOBAL hGlobal;
INT iPalSize;
hGlobal = GetClipboardData(uFormat);
if (!hGlobal)
@ -113,18 +114,96 @@ void SetDIBitsToDeviceFromClipboard(UINT uFormat, HDC hdc, int XDest, int YDest,
if (!lpInfoHeader)
return;
if (lpInfoHeader->biBitCount < 16)
if (lpInfoHeader->biSize == sizeof(BITMAPCOREHEADER))
{
iPalSize = (1 << lpInfoHeader->biBitCount) * 4;
LPBITMAPCOREHEADER lpCoreHeader = (LPBITMAPCOREHEADER)lpInfoHeader;
dwPalSize = 0;
if (lpCoreHeader->bcBitCount <= 8)
{
dwPalSize = (1 << lpCoreHeader->bcBitCount);
if (fuColorUse == DIB_RGB_COLORS)
dwPalSize *= sizeof(RGBTRIPLE);
else
dwPalSize *= sizeof(WORD);
}
bmWidth = lpCoreHeader->bcWidth;
bmHeight = lpCoreHeader->bcHeight;
}
else if ((lpInfoHeader->biSize == sizeof(BITMAPINFOHEADER)) ||
(lpInfoHeader->biSize == sizeof(BITMAPV4HEADER)) ||
(lpInfoHeader->biSize == sizeof(BITMAPV5HEADER)))
{
dwPalSize = lpInfoHeader->biClrUsed;
if ((dwPalSize == 0) && (lpInfoHeader->biBitCount <= 8))
dwPalSize = (1 << lpInfoHeader->biBitCount);
if (fuColorUse == DIB_RGB_COLORS)
dwPalSize *= sizeof(RGBQUAD);
else
dwPalSize *= sizeof(WORD);
if (/*(lpInfoHeader->biSize == sizeof(BITMAPINFOHEADER)) &&*/
(lpInfoHeader->biCompression == BI_BITFIELDS))
{
dwPalSize += 3 * sizeof(DWORD);
}
/*
* This is a (disabled) hack for Windows, when uFormat == CF_DIB
* it needs yet another extra 3 DWORDs, in addition to the
* ones already taken into account in via the compression.
* This problem doesn't happen when uFormat == CF_DIBV5
* (in that case, when compression is taken into account,
* everything is nice).
*
* NOTE 1: This fix is only for us, because when one pastes DIBs
* directly in apps, the bitmap offset problem is still present.
*
* NOTE 2: The problem can be seen with Windows' clipbrd.exe if
* one copies a CF_DIB image in the clipboard. By default Windows'
* clipbrd.exe works with CF_DIBV5 and CF_BITMAP, so the problem
* is unseen, and the clipboard doesn't have to convert to CF_DIB.
*
* FIXME: investigate!!
* ANSWER: this is a Windows bug; part of the answer is there:
* http://go4answers.webhost4life.com/Help/bug-clipboard-format-conversions-28724.aspx
* May be related:
* http://blog.talosintel.com/2015/10/dangerous-clipboard.html
*/
#if 0
if ((lpInfoHeader->biSize == sizeof(BITMAPINFOHEADER)) &&
(lpInfoHeader->biCompression == BI_BITFIELDS))
{
dwPalSize += 3 * sizeof(DWORD);
}
#endif
bmWidth = lpInfoHeader->biWidth;
bmHeight = lpInfoHeader->biHeight;
}
else
{
iPalSize = 0;
/* Invalid format */
GlobalUnlock(hGlobal);
return;
}
lpBits = (LPBYTE)lpInfoHeader + lpInfoHeader->biSize + iPalSize;
lpBits = (LPBYTE)lpInfoHeader + lpInfoHeader->biSize + dwPalSize;
SetDIBitsToDevice(hdc, XDest, YDest, lpInfoHeader->biWidth, lpInfoHeader->biHeight, XSrc, YSrc, uStartScan, lpInfoHeader->biHeight, lpBits, (LPBITMAPINFO)lpInfoHeader, fuColorUse);
SetDIBitsToDevice(hdc,
XDest, YDest,
bmWidth, bmHeight,
XSrc, YSrc,
uStartScan,
bmHeight,
lpBits,
(LPBITMAPINFO)lpInfoHeader,
fuColorUse);
GlobalUnlock(hGlobal);
}