132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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EmulateClipboardDIBFormat.cpp
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Abstract:
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On Win9x when you copy a high color bitmap onto the clipboard, it always
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gets converted to a 24-bit DIB when you ask the clipboard for CF_DIB
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format. On NT the conversion doesn't happen. So some apps are only
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designed to handle 8-bit and 24-bit DIBs (example, Internet Commsuite).
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So we convert the high-color (16-bit and 32-bit) DIBs to 24-bit DIBs
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- we don't need to handle 24-bit ones as they should already be handled
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by the app itself (or it won't work on 9x).
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Notes:
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This is a general purpose shim.
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History:
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01/24/2001 maonis Created
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--*/
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#include "precomp.h"
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//#include <userenv.h>
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IMPLEMENT_SHIM_BEGIN(EmulateClipboardDIBFormat)
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#include "ShimHookMacro.h"
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typedef HANDLE (*_pfn_GetClipboardData)(UINT);
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typedef BOOL (*_pfn_CloseClipboard)(VOID);
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(GetClipboardData)
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APIHOOK_ENUM_ENTRY(CloseClipboard)
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APIHOOK_ENUM_END
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BITMAPINFOHEADER* g_pv = NULL;
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DWORD CalcBitmapSize(BITMAPINFOHEADER* pbih)
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{
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return pbih->biWidth * pbih->biHeight * pbih->biBitCount / 8;
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}
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HANDLE
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APIHOOK(GetClipboardData)(
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UINT uFormat // clipboard format
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)
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{
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if (uFormat == CF_DIB)
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{
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BITMAPINFO* pbmiOriginal = (BITMAPINFO*)ORIGINAL_API(GetClipboardData)(uFormat);
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if ((pbmiOriginal->bmiHeader.biBitCount > 8) && (pbmiOriginal->bmiHeader.biBitCount != 24))
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{
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HDC hdc = CreateCompatibleDC(NULL);
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if (hdc)
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{
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VOID* pvOriginal;
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HBITMAP hbmpOriginal = CreateDIBSection(hdc, pbmiOriginal, DIB_RGB_COLORS, &pvOriginal, NULL, 0);
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if (hbmpOriginal)
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{
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DWORD* pdwOriginal = (DWORD *)(pbmiOriginal + 1) +
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((pbmiOriginal->bmiHeader.biCompression == BI_BITFIELDS) ? 2 : -1);
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// Fill in the data.
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memcpy(pvOriginal, pdwOriginal, CalcBitmapSize(&(pbmiOriginal->bmiHeader)));
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BITMAPINFOHEADER bmi;
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memcpy(&bmi, pbmiOriginal, sizeof(BITMAPINFOHEADER));
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bmi.biBitCount = 24;
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bmi.biSizeImage = 0;
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bmi.biCompression = BI_RGB;
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if (GetDIBits(hdc, hbmpOriginal, 0, bmi.biHeight, NULL, (BITMAPINFO*)&bmi, DIB_RGB_COLORS))
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{
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// We need to allocate a contiguous block of memory to hold both the
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// bitmap header and the data.
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g_pv = (BITMAPINFOHEADER*) new BYTE [sizeof(BITMAPINFOHEADER) + bmi.biSizeImage];
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if (g_pv)
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{
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memcpy(g_pv, &bmi, sizeof(BITMAPINFOHEADER));
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if (GetDIBits(hdc, hbmpOriginal, 0, bmi.biHeight, g_pv + 1, (BITMAPINFO*)&bmi, DIB_RGB_COLORS))
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{
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return (HANDLE)g_pv;
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}
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}
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}
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DeleteObject(hbmpOriginal);
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}
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DeleteDC(hdc);
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}
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}
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}
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return ORIGINAL_API(GetClipboardData)(uFormat);
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}
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BOOL
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APIHOOK(CloseClipboard)(
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VOID
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)
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{
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if (g_pv)
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{
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delete g_pv;
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g_pv = NULL;
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}
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return ORIGINAL_API(CloseClipboard)();
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}
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HOOK_BEGIN
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APIHOOK_ENTRY(USER32.DLL, GetClipboardData)
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APIHOOK_ENTRY(USER32.DLL, CloseClipboard)
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HOOK_END
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IMPLEMENT_SHIM_END
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