mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
392 lines
12 KiB
392 lines
12 KiB
/* DITHER.C
|
|
|
|
Frosting: Master Theme Selector for Windows '95
|
|
Copyright (c) 1994-1998 Microsoft Corporation. All rights reserved.
|
|
*/
|
|
|
|
|
|
#include <windows.h>
|
|
#include <windowsx.h>
|
|
|
|
#ifdef DBG
|
|
#define _DEBUG
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
#define _DEBUG
|
|
#endif
|
|
|
|
#ifdef _DEBUG
|
|
#include <mmsystem.h>
|
|
#define TIMESTART(sz) { TCHAR szTime[80]; DWORD time = timeGetTime();
|
|
#define TIMESTOP(sz) time = timeGetTime() - time; wsprintf(szTime, TEXT("%s took %d.%03d sec\r\n"), sz, time/1000, time%1000); OutputDebugString(szTime); }
|
|
#else
|
|
#define TIMESTART(sz)
|
|
#define TIMESTOP(sz)
|
|
#endif
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// helpers
|
|
//-----------------------------------------------------------------------------
|
|
__inline UINT Clamp8(int z)
|
|
{
|
|
return (UINT)(((z) < 0) ? 0 : (((z) > 255) ? 255 : (z)));
|
|
}
|
|
|
|
__inline WORD rgb555(r, g, b)
|
|
{
|
|
return (((WORD)(r) << 10) | ((WORD)(g) << 5) | (WORD)(b));
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Rounding stuff
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// round an 8bit value to a 5bit value with good distribution
|
|
//
|
|
#pragma data_seg(".text", "CODE")
|
|
BYTE aRound8to5[] = {
|
|
0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,
|
|
2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4,
|
|
4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6,
|
|
6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8,
|
|
8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10,
|
|
10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12,
|
|
12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
|
|
14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15,
|
|
16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17,
|
|
18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19,
|
|
19, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21,
|
|
21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23,
|
|
23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25,
|
|
25, 25, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27,
|
|
27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29,
|
|
29, 29, 29, 30, 30, 30, 30, 30, 30, 30, 30, 31, 31, 31, 31, 31,
|
|
};
|
|
#pragma data_seg()
|
|
|
|
//
|
|
// complement of table above
|
|
//
|
|
#pragma data_seg(".text", "CODE")
|
|
BYTE aRound5to8[] = {
|
|
0, 8, 16, 25, 33, 41, 49, 58, 66, 74, 82, 90, 99,107,115,123,
|
|
132,140,148,156,165,173,181,189,197,206,214,222,230,239,247,255,
|
|
};
|
|
#pragma data_seg()
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// RoundPixel555
|
|
//-----------------------------------------------------------------------------
|
|
__inline WORD RoundPixel555(int r, int g, int b)
|
|
{
|
|
return rgb555(aRound8to5[r], aRound8to5[g], aRound8to5[b]);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Round24from555
|
|
//-----------------------------------------------------------------------------
|
|
__inline void Round24from555(RGBQUAD *out, WORD in)
|
|
{
|
|
out->rgbBlue = aRound5to8[ (in) & 0x1f];
|
|
out->rgbGreen = aRound5to8[ (in >> 5) & 0x1f];
|
|
out->rgbRed = aRound5to8[(in >> 10) & 0x1f];
|
|
}
|
|
|
|
|
|
/******************************Public*Routine******************************\
|
|
* 16bpp dither stuff
|
|
*
|
|
* pimped from dibengine
|
|
*
|
|
\**************************************************************************/
|
|
//
|
|
// map a 8bit value (0-255) to a 5bit value (0-31) *evenly*
|
|
//
|
|
// if (i < 8) return 0;
|
|
// if (i == 255) return 31;
|
|
// return (i-8)/8;
|
|
//
|
|
#pragma data_seg(".text", "CODE")
|
|
BYTE aMap8to5[] = {
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2,
|
|
3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
|
|
5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8,
|
|
9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10,
|
|
11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12,
|
|
13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14,
|
|
15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
|
|
17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18,
|
|
19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20,
|
|
21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22,
|
|
23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24,
|
|
25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26,
|
|
27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28,
|
|
29, 29, 29, 29, 29, 29, 29, 29, 30, 30, 30, 30, 30, 30, 30, 31,
|
|
};
|
|
#pragma data_seg()
|
|
|
|
//
|
|
// map a 5bit value back to a 8bit value
|
|
//
|
|
// if (i==0) return 0;
|
|
// if (i==31) return 255;
|
|
// return i*8+8;
|
|
//
|
|
#pragma data_seg(".text", "CODE")
|
|
BYTE aMap5to8[] = {
|
|
0, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96,104,112,120,128,
|
|
136,144,152,160,168,176,184,192,200,208,216,224,232,240,248,255,
|
|
};
|
|
#pragma data_seg()
|
|
|
|
//
|
|
// halftone table for 16bpp dithers
|
|
//
|
|
#pragma data_seg(".text", "CODE")
|
|
BYTE aHalftone16[4][4] = {
|
|
0, 4, 1, 5,
|
|
6, 2, 7, 3,
|
|
1, 5, 0, 4,
|
|
7, 3, 6, 2,
|
|
};
|
|
#pragma data_seg()
|
|
|
|
/******************************Public*Routine******************************\
|
|
* Dither555
|
|
*
|
|
\**************************************************************************/
|
|
__inline WORD
|
|
Dither555(BYTE r, BYTE re, BYTE g, BYTE ge, BYTE b, BYTE be, BYTE e)
|
|
{
|
|
return rgb555(r + (re > e), g + (ge > e), b + (be > e));
|
|
}
|
|
|
|
/******************************Public*Routine******************************\
|
|
* DitherPixel555
|
|
*
|
|
* Takes RGB and x/y coords
|
|
* and produces an appropriate 555 pixel.
|
|
*
|
|
\**************************************************************************/
|
|
__inline WORD DitherPixel555(int rs, int gs, int bs, int x, int y)
|
|
{
|
|
BYTE r = aMap8to5[rs];
|
|
BYTE re = rs - aMap5to8[r];
|
|
|
|
BYTE g = aMap8to5[gs];
|
|
BYTE ge = gs - aMap5to8[g];
|
|
|
|
BYTE b = aMap8to5[bs];
|
|
BYTE be = bs - aMap5to8[b];
|
|
|
|
return Dither555(r, re, g, ge, b, be, aHalftone16[x % 4][y % 4]);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
typedef struct {int r, g, b;} ERRBUF;
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
void DitherScan(LPBYTE dst, LPBYTE src, RGBQUAD *colors, LPBYTE map,
|
|
ERRBUF *cur_err, ERRBUF *nxt_err, int dx, int y, BOOL f8bpp, BOOL fOrder16)
|
|
{
|
|
RGBQUAD rgbChosen, *pChosen = &rgbChosen;
|
|
WORD wColor16;
|
|
int er,eg,eb;
|
|
int r, g, b;
|
|
int x;
|
|
|
|
for (x=0; x<dx; x++)
|
|
{
|
|
r = Clamp8((int)src[2] + cur_err[x].r / 16);
|
|
g = Clamp8((int)src[1] + cur_err[x].g / 16);
|
|
b = Clamp8((int)src[0] + cur_err[x].b / 16);
|
|
|
|
wColor16 = (fOrder16? DitherPixel555(r,g,b,x,y) : RoundPixel555(r,g,b));
|
|
|
|
if (f8bpp)
|
|
pChosen = colors + (*dst++ = map[wColor16]);
|
|
else
|
|
Round24from555(pChosen, (*((WORD *)dst)++ = wColor16));
|
|
|
|
er = r - (int)pChosen->rgbRed;
|
|
eg = g - (int)pChosen->rgbGreen;
|
|
eb = b - (int)pChosen->rgbBlue;
|
|
|
|
cur_err[x+1].r += er * 7;
|
|
cur_err[x+1].g += eg * 7;
|
|
cur_err[x+1].b += eb * 7;
|
|
|
|
nxt_err[x-1].r += er * 3;
|
|
nxt_err[x-1].g += eg * 3;
|
|
nxt_err[x-1].b += eb * 3;
|
|
|
|
nxt_err[x+0].r += er * 5;
|
|
nxt_err[x+0].g += eg * 5;
|
|
nxt_err[x+0].b += eb * 5;
|
|
|
|
nxt_err[x+1].r += er * 1;
|
|
nxt_err[x+1].g += eg * 1;
|
|
nxt_err[x+1].b += eb * 1;
|
|
|
|
src+=3;
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
void DitherEngine(LPBYTE dst, LPBYTE src, RGBQUAD *colors, LPBYTE map,
|
|
int dx, int dy, int dx_bytes, BOOL f8bpp, BOOL fOrder16)
|
|
{
|
|
ERRBUF *buf;
|
|
ERRBUF *err0;
|
|
ERRBUF *err1;
|
|
ERRBUF *cur_err;
|
|
ERRBUF *nxt_err;
|
|
int src_next_scan;
|
|
int y, i;
|
|
|
|
src_next_scan = (dx*3+3)&~3;
|
|
|
|
buf = (ERRBUF *)LocalAlloc(LPTR, sizeof(ERRBUF) * (dx+2) * 2);
|
|
if (buf)
|
|
{
|
|
err0 = cur_err = buf+1;
|
|
err1 = nxt_err = buf+1 + dx + 2;
|
|
|
|
/* read line by line, quantize, and transfer */
|
|
for (y=0; y<dy; y++)
|
|
{
|
|
DitherScan(dst, src, colors, map, cur_err, nxt_err, dx, y,
|
|
f8bpp, fOrder16);
|
|
|
|
src += src_next_scan;
|
|
dst += dx_bytes;
|
|
|
|
cur_err = nxt_err;
|
|
nxt_err = cur_err == err0 ? err1 : err0;
|
|
|
|
for (i=-1; i<=dx; i++)
|
|
nxt_err[i].r = nxt_err[i].g = nxt_err[i].b = 0;
|
|
}
|
|
LocalFree((HLOCAL)buf);
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
// note that this layout has scanlines DWORD aligned
|
|
#define INVMAP_IMAGE_PELS (0x8000)
|
|
#define INVMAP_IMAGE_X (0x0100)
|
|
#define INVMAP_IMAGE_Y (INVMAP_IMAGE_PELS / INVMAP_IMAGE_X)
|
|
|
|
HBITMAP CreateInverseMapping(BYTE **ppMap, HDC hdcColors)
|
|
{
|
|
BOOL fResult = FALSE;
|
|
HBITMAP hbmDst, hbmOldColors;
|
|
HDC hdcSrc;
|
|
|
|
*ppMap = NULL;
|
|
|
|
if ((hbmDst = CreateCompatibleBitmap(hdcColors,
|
|
INVMAP_IMAGE_X, INVMAP_IMAGE_Y)) == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
hbmOldColors = SelectBitmap(hdcColors, hbmDst);
|
|
|
|
if ((hdcSrc = CreateCompatibleDC(NULL)) != NULL)
|
|
{
|
|
WORD *pSrc;
|
|
BITMAPINFO bmiSrc = {sizeof(BITMAPINFOHEADER), INVMAP_IMAGE_X,
|
|
INVMAP_IMAGE_Y, 1, 16, BI_RGB, 0, 0, 0, 0, 0};
|
|
HBITMAP hbmSrc = CreateDIBSection(hdcColors, &bmiSrc, DIB_RGB_COLORS,
|
|
&pSrc, NULL, 0);
|
|
|
|
if (hbmSrc)
|
|
{
|
|
BITMAP bmDst;
|
|
if (GetObject(hbmDst, sizeof(bmDst), &bmDst))
|
|
{
|
|
HBITMAP hbmOldSrc = SelectBitmap(hdcSrc, hbmSrc);
|
|
UINT u = 0;
|
|
|
|
while (u < INVMAP_IMAGE_PELS)
|
|
*pSrc++ = (WORD)u++;
|
|
|
|
BitBlt(hdcColors, 0, 0, INVMAP_IMAGE_X, INVMAP_IMAGE_Y, hdcSrc,
|
|
0, 0, SRCCOPY);
|
|
|
|
*ppMap = (BYTE *)bmDst.bmBits;
|
|
|
|
SelectBitmap(hdcSrc, hbmOldSrc);
|
|
}
|
|
|
|
DeleteBitmap(hbmSrc);
|
|
}
|
|
|
|
DeleteDC(hdcSrc);
|
|
}
|
|
|
|
SelectBitmap(hdcColors, hbmOldColors);
|
|
|
|
if (*ppMap)
|
|
return hbmDst;
|
|
|
|
DeleteBitmap(hbmDst);
|
|
return NULL;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
BOOL DitherImage(HDC hdcDst, HBITMAP hbmDst, LPBITMAPINFOHEADER lpbiSrc,
|
|
LPBYTE lpbSrc, BOOL fOrder16)
|
|
{
|
|
BOOL fResult = FALSE;
|
|
BITMAP bmDst;
|
|
|
|
if (lpbiSrc->biBitCount != 24)
|
|
return FALSE;
|
|
|
|
if (GetObject(hbmDst, sizeof(bmDst), &bmDst))
|
|
{
|
|
if ((lpbiSrc->biWidth == bmDst.bmWidth) &&
|
|
(lpbiSrc->biHeight == bmDst.bmHeight) &&
|
|
((bmDst.bmBitsPixel == 16) || (bmDst.bmBitsPixel == 8)))
|
|
{
|
|
RGBQUAD rgbColors[256];
|
|
HBITMAP hbmMap = NULL;
|
|
BYTE *pMap;
|
|
BOOL f8bpp = (bmDst.bmBitsPixel == 8);
|
|
|
|
if (f8bpp)
|
|
{
|
|
TIMESTART(TEXT("CreateInverseMap"));
|
|
if ((hbmMap = CreateInverseMapping(&pMap, hdcDst)) == NULL)
|
|
goto error;
|
|
|
|
GetDIBColorTable(hdcDst, 0, 256, rgbColors);
|
|
TIMESTOP(TEXT("CreateInverseMap"));
|
|
}
|
|
|
|
DitherEngine((LPBYTE)bmDst.bmBits, lpbSrc, rgbColors, pMap,
|
|
bmDst.bmWidth, bmDst.bmHeight, bmDst.bmWidthBytes,
|
|
f8bpp, fOrder16);
|
|
|
|
if (hbmMap)
|
|
DeleteBitmap(hbmMap);
|
|
|
|
fResult = TRUE;
|
|
|
|
error:
|
|
; // make the compiler happy it wants a statement here
|
|
}
|
|
}
|
|
|
|
return fResult;
|
|
}
|