/* * palette.c * Common halftone palette used by shell. */ #include "priv.h" #include "palette.h" #ifdef UNIX #include #endif /* UNIX */ BYTE * g_pbWinNTCMAP = NULL; // This function behaves the same as CreateHalftone palette: // hdc == NULL always return full palette // hdc palettized return full palette // hdc not palettized return default palette (VGA colors) HPALETTE SHCreateShellPalette(HDC hdc) { HPALETTE hpalHalftone; LOGPAL256 lp; BOOL fGetSystemColors = FALSE; // We would like to use CreateHalftonePalette() always but they // differ significantly between NT and Win95. Win95's is very // close to Netscape's; NT's is significantly different (color // cube cut differently) and it is not an identity palette. // So, we will use CreateHalftonePalette() on Win95 and on NT // we will use a custom palette containing the same colors in // Win95's halftone palette ordered so that the color flash // will be minimized when switching between NT's halftone palette // and our palette. // On NT 5 and later the halftone palette matches Win95's so the // custom palette will only be used on machines running NT 4 or below. // However, we still need to patch in the system colors on NT 5. #ifdef UNIX if (MwIsInitLite()) return NULL; #endif /* UNIX */ if (!g_bRunningOnNT || g_bRunningOnNT5OrHigher) { hpalHalftone = CreateHalftonePalette(hdc); if (g_bRunningOnNT5OrHigher && hpalHalftone) { lp.wCnt = (WORD)GetPaletteEntries(hpalHalftone, 0, 256, lp.ape); lp.wVer = 0x0300; fGetSystemColors = TRUE; DeleteObject(hpalHalftone); } } else if (hdc == NULL || (GetDeviceCaps(hdc, RASTERCAPS) & RC_PALETTE)) { memcpy(&lp, &g_lpHalftone, sizeof(g_lpHalftone)); fGetSystemColors = TRUE; } else hpalHalftone = GetStockObject(DEFAULT_PALETTE); if (fGetSystemColors) { HDC hdcScreen = hdc; if (hdcScreen == NULL) hdcScreen = CreateCompatibleDC(NULL); #ifndef UNIX if (hdcScreen) { GetSystemPaletteEntries(hdcScreen, 0, 10, lp.ape); GetSystemPaletteEntries(hdcScreen, 246, 10, lp.ape + 246); } #endif hpalHalftone = CreatePalette((LOGPALETTE *)&lp); if (hdc == NULL && hdcScreen) DeleteDC(hdcScreen); } return hpalHalftone; } static const BYTE *GetInverseCMAP() { const BYTE * abWin95ToNT; if (!g_bRunningOnNT) { return g_abWin95CMAP; } abWin95ToNT = (g_bRunningOnNT5OrHigher ? g_abWin95ToNT5 : g_abWin95ToNT4); if (g_pbWinNTCMAP == NULL) { BYTE * pbMap = LocalAlloc(LPTR, 32768); if (pbMap) { int i; BYTE * pbDst = pbMap; const BYTE * pbSrc = g_abWin95CMAP; for (i = 0; i < 32768; ++i) { *pbDst++ = abWin95ToNT[*pbSrc++]; } if (SHInterlockedCompareExchange((void **)&g_pbWinNTCMAP, pbMap, NULL)) { LocalFree(pbMap); // race, get rid of dupe copy } } } return g_pbWinNTCMAP; } HRESULT SHGetInverseCMAP(BYTE *pbMap, ULONG cbMap) { const BYTE *pbSrc; if (pbMap == NULL) return E_POINTER; if (cbMap != 32768 && cbMap != sizeof(BYTE *)) return E_INVALIDARG; pbSrc = GetInverseCMAP(); if (pbSrc == NULL) return E_OUTOFMEMORY; if (cbMap == sizeof(BYTE *)) { *(const BYTE **)pbMap = pbSrc; } else { memcpy(pbMap, pbSrc, 32768); } return(S_OK); } void TermPalette() { if (g_pbWinNTCMAP) LocalFree(g_pbWinNTCMAP); }