Leaked source code of windows server 2003
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220 lines
7.4 KiB

// File: PixInfo.cpp
// Author: Michael Marr (mikemarr)
#include "stdafx.h"
#include "PixInfo.h"
#include "DDHelper.h"
static void
_GetShiftMaskInfo(DWORD dwMask, BYTE *pnShiftStart, BYTE *pnLengthResidual)
{
MMASSERT(pnShiftStart && pnLengthResidual);
// Note: - DWORD fills with zeros on right shift
DWORD nShift = 0, nRes = 8;
if (dwMask) {
// compute shift
if ((dwMask & 0xFFFF) == 0) { dwMask >>= 16, nShift += 16; }
if ((dwMask & 0xFF) == 0) { dwMask >>= 8; nShift += 8; }
if ((dwMask & 0xF) == 0) { dwMask >>= 4; nShift += 4; }
if ((dwMask & 0x3) == 0) { dwMask >>= 2; nShift += 2; }
if ((dwMask & 0x1) == 0) { dwMask >>= 1; nShift++; }
// compute residual
if ((dwMask & 0xFF) == 0xFF) {
nRes = 0;
} else {
if ((dwMask & 0xF) == 0xF) { dwMask >>= 4; nRes -= 4; }
if ((dwMask & 0x3) == 0x3) { dwMask >>= 2; nRes -= 2; }
if ((dwMask & 0x1) == 0x1) { nRes--; }
}
}
*pnShiftStart = (BYTE) nShift;
*pnLengthResidual = (BYTE) (nRes);
}
HRESULT
CPixelInfo::Init(BYTE tnBPP, DWORD dwRedMask, DWORD dwGreenMask,
DWORD dwBlueMask, DWORD dwAlphaMask)
{
nBPP = tnBPP;
uchFlags = 0;
if (dwRedMask) {
uchFlags |= flagPixiRGB;
_GetShiftMaskInfo(dwRedMask, &nRedShift, &nRedResidual);
_GetShiftMaskInfo(dwGreenMask, &nGreenShift, &nGreenResidual);
_GetShiftMaskInfo(dwBlueMask, &nBlueShift, &nBlueResidual);
_GetShiftMaskInfo(dwAlphaMask, &nAlphaShift, &nAlphaResidual);
if (dwAlphaMask)
uchFlags |= flagPixiAlpha;
} else {
nRedResidual = nGreenResidual = nBlueResidual = nAlphaResidual = 8;
nRedShift = nGreenShift = nBlueShift = nAlphaShift = 0;
}
iRed = (nRedShift == 0 ? 0 : 2);
iBlue = 2 - iRed;
// MMTRACE("BPP: %2d R: %2d %2d G: %2d %2d B: %2d %2d A: %2d %2d\n", nBPP,
// 8 - nRedResidual, nRedShift, 8 - nGreenResidual, nGreenShift,
// 8 - nBlueResidual, nBlueShift, 8 - nAlphaResidual, nAlphaShift);
return S_OK;
}
void
CPixelInfo::GetDDPF(DDPIXELFORMAT &ddpf) const
{
ddpf.dwSize = sizeof(DDPIXELFORMAT);
ddpf.dwFlags = DDPF_RGB;
ddpf.dwRGBBitCount = nBPP;
if (IsRGB()) {
ddpf.dwRBitMask = ((((DWORD) 0xFF) >> nRedResidual) << nRedShift);
ddpf.dwGBitMask = ((((DWORD) 0xFF) >> nGreenResidual) << nGreenShift);
ddpf.dwBBitMask = ((((DWORD) 0xFF) >> nBlueResidual) << nBlueShift);
ddpf.dwRGBAlphaBitMask = ((((DWORD) 0xFF) >> nAlphaResidual) << nAlphaShift);
if (HasAlpha())
ddpf.dwFlags |= DDPF_ALPHAPIXELS;
} else {
ddpf.dwFlags |= BPPToPixelFlags(nBPP);
ddpf.dwRBitMask = ddpf.dwGBitMask = ddpf.dwBBitMask = ddpf.dwRGBAlphaBitMask = 0;
}
}
BOOL
CPixelInfo::operator==(const CPixelInfo &pixi) const
{
return ((nBPP == pixi.nBPP) && (!IsRGB() ||
((nRedShift == pixi.nRedShift) && (nGreenShift == pixi.nGreenShift) &&
(nBlueShift == pixi.nBlueShift) && (nAlphaShift == pixi.nAlphaShift))));
}
BOOL
CPixelInfo::operator==(const DDPIXELFORMAT &ddpf) const
{
return ((nBPP == ddpf.dwRGBBitCount) && ((!IsRGB() && (ddpf.dwRBitMask == 0)) ||
((ddpf.dwRBitMask == ((DWORD(0xFF) >> nRedResidual) << nRedShift)) &&
(ddpf.dwGBitMask == ((DWORD(0xFF) >> nGreenResidual) << nGreenShift)) &&
(ddpf.dwBBitMask == ((DWORD(0xFF) >> nBlueResidual) << nBlueShift)) &&
(ddpf.dwRGBAlphaBitMask == ((DWORD(0xFF) >> nAlphaResidual) << nAlphaShift)))));
}
DWORD
CPixelInfo::Pack(const BYTE *pPixel) const
{
MMASSERT(pPixel && (nBPP >= 8));
if (nBPP == 8)
return (DWORD) *pPixel;
if (HasAlpha())
return Pack(pPixel[0], pPixel[1], pPixel[2], pPixel[3]);
else
return Pack(pPixel[0], pPixel[1], pPixel[2]);
}
DWORD
CPixelInfo::Pack(BYTE r, BYTE g, BYTE b) const
{
// truncate the RGB values to fit in allotted bits
return (((((DWORD) r) >> nRedResidual) << nRedShift) |
((((DWORD) g) >> nGreenResidual) << nGreenShift) |
((((DWORD) b) >> nBlueResidual) << nBlueShift));
}
DWORD
CPixelInfo::Pack(BYTE r, BYTE g, BYTE b, BYTE a) const
{
// truncate the alpha value to fit in allotted bits
return (((((DWORD) r) >> nRedResidual) << nRedShift) |
((((DWORD) g) >> nGreenResidual) << nGreenShift) |
((((DWORD) b) >> nBlueResidual) << nBlueShift) |
((((DWORD) a) >> nAlphaResidual) << nAlphaShift));
}
void
CPixelInfo::UnPack(DWORD dwPixel, BYTE *pR, BYTE *pG, BYTE *pB, BYTE *pA) const
{
MMASSERT(pR && pG && pB && pA);
*pR = (BYTE) (((dwPixel >> nRedShift) & (0xFF >> nRedResidual)) << nRedResidual);
*pG = (BYTE) (((dwPixel >> nGreenShift) & (0xFF >> nGreenResidual)) << nGreenResidual);
*pB = (BYTE) (((dwPixel >> nBlueShift) & (0xFF >> nBlueResidual)) << nBlueResidual);
*pA = (BYTE) (((dwPixel >> nAlphaShift) & (0xFF >> nAlphaResidual)) << nAlphaResidual);
}
void
CPixelInfo::UnPack(DWORD dwPixel, BYTE *pR, BYTE *pG, BYTE *pB) const
{
MMASSERT(pR && pG && pB);
*pR = (BYTE)(((dwPixel >> nRedShift) & (0xFF >> nRedResidual)) << nRedResidual);
*pG = (BYTE)(((dwPixel >> nGreenShift) & (0xFF >> nGreenResidual)) << nGreenResidual);
*pB = (BYTE)(((dwPixel >> nBlueShift) & (0xFF >> nBlueResidual)) << nBlueResidual);
}
DWORD
CPixelInfo::TranslatePack(DWORD dwPix, const CPixelInfo &pixiSrc) const
{
// REVIEW: this could be optimized by splitting out the cases
DWORD dwTmp;
dwTmp = ((((((dwPix >> pixiSrc.nRedShift) & (0xFF >> pixiSrc.nRedResidual))
<< pixiSrc.nRedResidual) >> nRedResidual) << nRedShift) |
(((((dwPix >> pixiSrc.nGreenShift) & (0xFF >> pixiSrc.nGreenResidual))
<< pixiSrc.nGreenResidual) >> nGreenResidual) << nGreenShift) |
(((((dwPix >> pixiSrc.nBlueShift) & (0xFF >> pixiSrc.nBlueResidual))
<< pixiSrc.nBlueResidual) >> nBlueResidual) << nBlueShift));
if (pixiSrc.HasAlpha())
dwTmp |= (((((dwPix >> pixiSrc.nAlphaShift) & (0xFF >> pixiSrc.nAlphaResidual))
<< pixiSrc.nAlphaResidual) >> nAlphaResidual) << nAlphaShift);
return dwTmp;
}
WORD
CPixelInfo::Pack16(BYTE r, BYTE g, BYTE b) const
{
MMASSERT(nBPP == 16);
return (((((WORD) r) >> nRedResidual) << nRedShift) |
((((WORD) g) >> nGreenResidual) << nGreenShift) |
((((WORD) b) >> nBlueResidual) << nBlueShift));
}
WORD
CPixelInfo::Pack16(BYTE r, BYTE g, BYTE b, BYTE a) const
{
MMASSERT(nBPP == 16);
return (((((WORD) r) >> nRedResidual) << nRedShift) |
((((WORD) g) >> nGreenResidual) << nGreenShift) |
((((WORD) b) >> nBlueResidual) << nBlueShift) |
((((WORD) a) >> nAlphaResidual) << nAlphaShift));
}
/*
void
TestPixi()
{
DDPIXELFORMAT ddpf;
INIT_DXSTRUCT(ddpf);
DWORD dwTmp = 0;
BYTE r = 0, g = 0, b = 0, a = 0;
MMASSERT(g_pixiPalette8 != g_ddpfBGR332);
MMASSERT(g_pixiRGB != g_pixiBGR);
MMASSERT(g_pixiRGB565 != g_ddpfBGR565);
MMASSERT(g_pixiBGRA5551 == g_ddpfBGRA5551);
MMASSERT(g_pixiBGRX != g_pixiBGRA);
MMASSERT(g_pixiBGR != g_pixiBGRX);
MMASSERT(g_pixiBGRA5551 != g_pixiBGR555);
MMASSERT(g_pixiBGR332.Pack(0x00, 0xFF, 0x00) == g_ddpfBGR332.dwGBitMask);
MMASSERT(g_pixiBGRA4444.Pack(0x00, 0x00, 0x00, 0xFF) == g_ddpfBGRA4444.dwRGBAlphaBitMask);
MMASSERT(g_pixiBGRA5551.TranslatePack(g_pixiBGRA4444.Pack(0, 0, 0, 0xFF), g_pixiBGRA4444) == g_ddpfBGRA5551.dwRGBAlphaBitMask);
g_pixiRGB.UnPack(g_pixiRGB.Pack(0xFF, 0, 0), &r, &g, &b, &a);
MMASSERT((r == 0xFF) && (g == 0) && (b == 0) && (a == 0));
g_pixiBGR332.GetDDPF(ddpf);
MMASSERT(ddpf == g_ddpfBGR332);
g_pixiPalette8.GetDDPF(ddpf);
MMASSERT(ddpf == g_ddpfPalette8);
g_pixiBGRA4444.GetDDPF(ddpf);
MMASSERT(g_ddpfBGRA4444 == ddpf);
g_pixiBGR565.GetDDPF(ddpf);
MMASSERT(g_ddpfBGR565 == ddpf);
}
*/