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Changed: Allow to resample Luminance (grayscale) bitmaps

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--HG--
branch : develop
This commit is contained in:
kervala 2016-01-04 13:54:59 +01:00
parent c263e4dffb
commit 47bde9ccc7
2 changed files with 273 additions and 7 deletions
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28
code/nel/include/nel/misc/bitmap.h
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@ -236,6 +236,34 @@ private :
sint32 nDestWidth, sint32 nDestHeight);
/**
* The grayscale resample function
* \param pSrc grayscale 8-bits array
* \param pDest grayscale 8-bits array for storing resampled texture
* \param nSrcWidth original width
* \param nSrcHeight original height
* \param nDestWidth width after resample
* \param nDestHeight height after resample
*/
void resamplePicture8 (const uint8 *pSrc, uint8 *pDest,
sint32 nSrcWidth, sint32 nSrcHeight,
sint32 nDestWidth, sint32 nDestHeight);
/**
* The FAST resample function : works only when reducing the size by two
* and when the image is square
* \param pSrc grayscale 8-bits array
* \param pDest grayscale 8-bits array for storing resampled texture
* \param nSrcWidth original width
* \param nSrcHeight original height
* \param nDestWidth width after resample
* \param nDestHeight height after resample
*/
void resamplePicture8Fast (const uint8 *pSrc, uint8 *pDest,
sint32 nSrcWidth, sint32 nSrcHeight,
sint32 nDestWidth, sint32 nDestHeight);
/**
* Quadratic interpolator
* \return the interpolation in (x,y) of the values (xy**)

240
code/nel/src/misc/bitmap.cpp
View file

@ -1785,7 +1785,7 @@ void CBitmap::releaseMipMaps()
\*-------------------------------------------------------------------*/
void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
{
nlassert(PixelFormat == RGBA);
nlassert(PixelFormat == RGBA || PixelFormat == Luminance);
bool needRebuild = false;
// Deleting mipmaps
@ -1804,6 +1804,9 @@ void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
//logResample("Resample: 30");
CObjectVector<uint8> pDestui;
if (PixelFormat == RGBA)
{
pDestui.resize(nNewWidth*nNewHeight*4);
//logResample("Resample: 40");
NLMISC::CRGBA *pDestRgba = (NLMISC::CRGBA*)&pDestui[0];
@ -1811,6 +1814,17 @@ void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
resamplePicture32 ((NLMISC::CRGBA*)&_Data[0][0], pDestRgba, _Width, _Height, nNewWidth, nNewHeight);
//logResample("Resample: 60");
}
else if (PixelFormat == Luminance)
{
pDestui.resize(nNewWidth*nNewHeight);
//logResample("Resample: 40");
uint8 *pDestGray = &pDestui[0];
//logResample("Resample: 50");
resamplePicture8 (&_Data[0][0], pDestGray, _Width, _Height, nNewWidth, nNewHeight);
//logResample("Resample: 60");
}
NLMISC::contReset(_Data[0]); // free memory
//logResample("Resample: 70");
@ -2126,6 +2140,230 @@ void CBitmap::resamplePicture32Fast (const NLMISC::CRGBA *pSrc, NLMISC::CRGBA *p
}
/*-------------------------------------------------------------------*\
resamplePicture32
\*-------------------------------------------------------------------*/
void CBitmap::resamplePicture8 (const uint8 *pSrc, uint8 *pDest,
sint32 nSrcWidth, sint32 nSrcHeight,
sint32 nDestWidth, sint32 nDestHeight)
{
//logResample("RP8: 0 pSrc=%p pDest=%p, Src=%d x %d Dest=%d x %d", pSrc, pDest, nSrcWidth, nSrcHeight, nDestWidth, nDestHeight);
if ((nSrcWidth<=0)||(nSrcHeight<=0)||(nDestHeight<=0)||(nDestHeight<=0))
return;
// If we're reducing it by 2, call the fast resample
if (((nSrcHeight / 2) == nDestHeight) && ((nSrcHeight % 2) == 0) &&
((nSrcWidth / 2) == nDestWidth) && ((nSrcWidth % 2) == 0))
{
resamplePicture8Fast(pSrc, pDest, nSrcWidth, nSrcHeight, nDestWidth, nDestHeight);
return;
}
bool bXMag=(nDestWidth>=nSrcWidth);
bool bYMag=(nDestHeight>=nSrcHeight);
bool bXEq=(nDestWidth==nSrcWidth);
bool bYEq=(nDestHeight==nSrcHeight);
std::vector<float> pIterm (nDestWidth*nSrcHeight);
if (bXMag)
{
float fXdelta=(float)(nSrcWidth)/(float)(nDestWidth);
float *pItermPtr=&*pIterm.begin();
sint32 nY;
for (nY=0; nY<nSrcHeight; nY++)
{
const uint8 *pSrcLine=pSrc;
float fX=0.f;
sint32 nX;
for (nX=0; nX<nDestWidth; nX++)
{
float fVirgule=fX-(float)floor(fX);
nlassert (fVirgule>=0.f);
float vColor;
if (fVirgule>=0.5f)
{
if (fX<(float)(nSrcWidth-1))
{
float vColor1 (pSrcLine[(sint32)floor(fX)]);
float vColor2 (pSrcLine[(sint32)floor(fX)+1]);
vColor=vColor1*(1.5f-fVirgule)+vColor2*(fVirgule-0.5f);
}
else
vColor = float(pSrcLine[(sint32)floor(fX)]);
}
else
{
if (fX>=1.f)
{
float vColor1 (pSrcLine[(sint32)floor(fX)]);
float vColor2 (pSrcLine[(sint32)floor(fX)-1]);
vColor = vColor1*(0.5f+fVirgule)+vColor2*(0.5f-fVirgule);
}
else
vColor = float (pSrcLine[(sint32)floor(fX)]);
}
*(pItermPtr++)=vColor;
fX+=fXdelta;
}
pSrc+=nSrcWidth;
}
}
else if (bXEq)
{
float *pItermPtr=&*pIterm.begin();
for (sint32 nY=0; nY<nSrcHeight; nY++)
{
const uint8 *pSrcLine=pSrc;
sint32 nX;
for (nX=0; nX<nDestWidth; nX++)
*(pItermPtr++) = float (pSrcLine[nX]);
pSrc+=nSrcWidth;
}
}
else
{
double fXdelta=(double)(nSrcWidth)/(double)(nDestWidth);
nlassert (fXdelta>1.f);
float *pItermPtr=&*pIterm.begin();
sint32 nY;
for (nY=0; nY<nSrcHeight; nY++)
{
const uint8 *pSrcLine=pSrc;
double fX=0.f;
sint32 nX;
for (nX=0; nX<nDestWidth; nX++)
{
float vColor = 0.f;
double fFinal=fX+fXdelta;
while ((fX<fFinal)&&((sint32)fX!=nSrcWidth))
{
double fNext=(double)floor (fX)+1.f;
if (fNext>fFinal)
fNext=fFinal;
vColor+=((float)(fNext-fX))* float (pSrcLine[(sint32)floor(fX)]);
fX=fNext;
}
fX = fFinal; // ensure fX == fFinal
vColor/=(float)fXdelta;
*(pItermPtr++)=vColor;
}
pSrc+=nSrcWidth;
}
}
if (bYMag)
{
double fYdelta=(double)(nSrcHeight)/(double)(nDestHeight);
sint32 nX;
for (nX=0; nX<nDestWidth; nX++)
{
double fY=0.f;
sint32 nY;
for (nY=0; nY<nDestHeight; nY++)
{
double fVirgule=fY-(double)floor(fY);
nlassert (fVirgule>=0.f);
float vColor;
if (fVirgule>=0.5f)
{
if (fY<(double)(nSrcHeight-1))
{
float vColor1=pIterm[((sint32)floor(fY))*nDestWidth+nX];
float vColor2=pIterm[(((sint32)floor(fY))+1)*nDestWidth+nX];
vColor=vColor1*(1.5f-(float)fVirgule)+vColor2*((float)fVirgule-0.5f);
}
else
vColor=pIterm[((sint32)floor(fY))*nDestWidth+nX];
}
else
{
if (fY>=1.f)
{
float vColor1=pIterm[((sint32)floor(fY))*nDestWidth+nX];
float vColor2=pIterm[(((sint32)floor(fY))-1)*nDestWidth+nX];
vColor=vColor1*(0.5f+(float)fVirgule)+vColor2*(0.5f-(float)fVirgule);
}
else
vColor=pIterm[((sint32)floor(fY))*nDestWidth+nX];
}
pDest[nX+nY*nDestWidth]=vColor;
fY+=fYdelta;
}
}
}
else if (bYEq)
{
for (sint32 nX=0; nX<nDestWidth; nX++)
{
sint32 nY;
for (nY=0; nY<nDestHeight; nY++)
{
pDest[nX+nY*nDestWidth]=pIterm[nY*nDestWidth+nX];
}
}
}
else
{
double fYdelta=(double)(nSrcHeight)/(double)(nDestHeight);
nlassert (fYdelta>1.f);
sint32 nX;
for (nX=0; nX<nDestWidth; nX++)
{
double fY=0.f;
sint32 nY;
for (nY=0; nY<nDestHeight; nY++)
{
float vColor = 0.f;
double fFinal=fY+fYdelta;
while ((fY<fFinal)&&((sint32)fY!=nSrcHeight))
{
double fNext=(double)floor (fY)+1.f;
if (fNext>fFinal)
fNext=fFinal;
vColor+=((float)(fNext-fY))*pIterm[((sint32)floor(fY))*nDestWidth+nX];
fY=fNext;
}
vColor/=(float)fYdelta;
pDest[nX+nY*nDestWidth]=vColor;
}
}
}
}
/*-------------------------------------------------------------------*\
resamplePicture8Fast
\*-------------------------------------------------------------------*/
void CBitmap::resamplePicture8Fast (const uint8 *pSrc, uint8 *pDest,
sint32 nSrcWidth, sint32 nSrcHeight,
sint32 nDestWidth, sint32 nDestHeight)
{
// the image is divided by two : 1 pixel in dest = 4 pixels in src
// the resulting pixel in dest is an average of the four pixels in src
nlassert(nSrcWidth % 2 == 0);
nlassert(nSrcHeight % 2 == 0);
nlassert(nSrcWidth / 2 == nDestWidth);
nlassert(nSrcHeight / 2 == nDestHeight);
sint32 x, y, twoX, twoSrcWidthByY;
for (y=0 ; y<nDestHeight ; y++)
{
twoSrcWidthByY = 2*nSrcWidth*y;
for (x=0 ; x<nDestWidth ; x++)
{
twoX = 2*x;
pDest[x+y*nDestWidth] = (
(uint)pSrc[twoX + twoSrcWidthByY ]+
(uint)pSrc[twoX + twoSrcWidthByY + nSrcWidth ]+
(uint)pSrc[twoX+1 + twoSrcWidthByY ]+
(uint)pSrc[twoX+1 + twoSrcWidthByY + nSrcWidth ]+1)>>2;
}
}
}
/*-------------------------------------------------------------------*\
readTGA