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218 lines
7.0 KiB
218 lines
7.0 KiB
/* HALFTONE.C
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Frosting: Master Theme Selector for Windows '95
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Copyright (c) 1994-1999 Microsoft Corporation. All rights reserved.
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*/
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#include<windows.h>
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#include<windowsx.h>
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/*----------------------------------------------------------------------------
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Division lookup tables. These tables compute 0-255 divided by 51 and
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modulo 51. These tables could approximate gamma correction.
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*/
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char unsigned const aDividedBy51Rounded[256] =
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{
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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};
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char unsigned const aDividedBy51[256] =
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{
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5,
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};
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char unsigned const aModulo51[256] =
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{
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
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38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 0, 1, 2, 3, 4, 5, 6,
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7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
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26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
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44, 45, 46, 47, 48, 49, 50, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
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13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
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31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
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18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
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36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 0, 1, 2, 3,
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4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
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23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 0,
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};
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/*----------------------------------------------------------------------------
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Multiplication LUTs. These compute 0-5 times 6 and 36.
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*/
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char unsigned const aTimes6[6] =
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{
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0, 6, 12, 18, 24, 30
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};
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char unsigned const aTimes36[6] =
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{
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0, 36, 72, 108, 144, 180
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};
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/*----------------------------------------------------------------------------
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Dither matrices for 8 bit to 2.6 bit halftones.
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*/
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char unsigned const aHalftone8x8[64] =
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{
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0, 38, 9, 47, 2, 40, 11, 50,
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25, 12, 35, 22, 27, 15, 37, 24,
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6, 44, 3, 41, 8, 47, 5, 43,
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31, 19, 28, 15, 34, 21, 31, 18,
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1, 39, 11, 49, 0, 39, 10, 48,
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27, 14, 36, 23, 26, 13, 35, 23,
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7, 46, 4, 43, 7, 45, 3, 42,
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33, 20, 30, 17, 32, 19, 29, 16,
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};
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/*----------------------------------------------------------------------------
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Buffer for brush bits.
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*/
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static BYTE aTranslate[216]; // map a 666 to a palette index
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/*----------------------------------------------------------------------------
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Dithering functions.
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*/
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__inline char unsigned DitherColor( char unsigned RedDiv51,
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char unsigned RedMod51, char unsigned GreenDiv51, char unsigned GreenMod51,
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char unsigned BlueDiv51, char unsigned BlueMod51, char unsigned Index )
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{
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// cbh! try out scoy's trick of adding without jumping
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#pragma warning (disable:4135) // conversion between different integral types
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char unsigned RedTemp = RedDiv51 + (RedMod51 > Index);
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char unsigned GreenTemp = GreenDiv51 + (GreenMod51 > Index);
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char unsigned BlueTemp = BlueDiv51 + (BlueMod51 > Index);
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return aTranslate[RedTemp + aTimes6[GreenTemp] + aTimes36[BlueTemp]];
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#pragma warning (default:4135) // conversion between different integral types
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}
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__inline BYTE DitherColorXY(COLORREF Color, int x, int y)
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{
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char unsigned RedDiv51 = aDividedBy51[GetRValue(Color)];
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char unsigned RedMod51 = aModulo51[GetRValue(Color)];
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char unsigned GreenDiv51 = aDividedBy51[GetGValue(Color)];
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char unsigned GreenMod51 = aModulo51[GetGValue(Color)];
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char unsigned BlueDiv51 = aDividedBy51[GetBValue(Color)];
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char unsigned BlueMod51 = aModulo51[GetBValue(Color)];
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return DitherColor(RedDiv51,RedMod51,GreenDiv51,
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GreenMod51,BlueDiv51,BlueMod51,
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aHalftone8x8[(x&7) + (y&7)*8]);
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}
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void InitHalftone(RGBQUAD FAR *pct)
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{
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int r,g,b,n,i;
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DWORD FAR *pdw;
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HPALETTE hpal;
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if (hpal = CreateHalftonePalette(NULL))
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{
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pdw = (DWORD FAR *)pct;
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n = GetPaletteEntries(hpal, 0, 256, (LPPALETTEENTRY)pdw);
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//
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// get the halftone palette colors
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//
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for (i=0; i<256; i++)
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pdw[i] = RGB(GetBValue(pdw[i]),GetGValue(pdw[i]),GetRValue(pdw[i]));
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pdw[8] = 0;
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pdw[9] = 0;
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pdw[246] = 0;
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pdw[247] = 0;
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//
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// now build the 666->index translate,
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//
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for (i=b=0; b<6; b++)
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for (g=0; g<6; g++)
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for (r=0; r<6; r++)
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aTranslate[i++] = (BYTE)(GetNearestPaletteIndex(hpal, RGB(r*51,g*51,b*51)));
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DeleteObject(hpal);
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}
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}
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BOOL HalftoneImage(HDC hdc, HBITMAP hbm, LPBITMAPINFOHEADER lpbi, LPBYTE lpBits)
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{
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int x, y;
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BYTE r,g,b;
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int dx, dy;
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BITMAP bm;
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LPBYTE pbSrc;
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LPBYTE pbDst;
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RGBQUAD ct[256];
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if (lpbi->biBitCount != 24)
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return FALSE;
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InitHalftone(ct);
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SetDIBColorTable(hdc, 0, 256, ct);
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GetObject(hbm, sizeof(bm), &bm);
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dx = lpbi->biWidth;
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dy = lpbi->biHeight;
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/* read line by line, quantize, and transfer */
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for (y=0; y<dy; y++)
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{
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pbSrc = lpBits;
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pbDst = bm.bmBits;
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for (x=0; x<dx; x++)
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{
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b = *pbSrc++;
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g = *pbSrc++;
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r = *pbSrc++;
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*pbDst++ = DitherColorXY(RGB(r,g,b),x,y);
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}
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(LPBYTE)lpBits += (lpbi->biWidth*3+3)&~3;
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(LPBYTE)bm.bmBits += bm.bmWidthBytes;
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}
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return TRUE;
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}
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