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https://port.numenaute.org/aleajactaest/khanat-opennel-code.git
synced 2024-11-10 09:19:01 +00:00
Changed: Allow to resample Luminance (grayscale) bitmaps
--HG-- branch : develop
This commit is contained in:
kervala
parent
c263e4dffb
commit
47bde9ccc7
2 changed files with 273 additions and 7 deletions
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@ -236,6 +236,34 @@ private :
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sint32 nDestWidth, sint32 nDestHeight);
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/**
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* The grayscale resample function
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* \param pSrc grayscale 8-bits array
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* \param pDest grayscale 8-bits array for storing resampled texture
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* \param nSrcWidth original width
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* \param nSrcHeight original height
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* \param nDestWidth width after resample
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* \param nDestHeight height after resample
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*/
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void resamplePicture8 (const uint8 *pSrc, uint8 *pDest,
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sint32 nSrcWidth, sint32 nSrcHeight,
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sint32 nDestWidth, sint32 nDestHeight);
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/**
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* The FAST resample function : works only when reducing the size by two
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* and when the image is square
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* \param pSrc grayscale 8-bits array
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* \param pDest grayscale 8-bits array for storing resampled texture
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* \param nSrcWidth original width
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* \param nSrcHeight original height
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* \param nDestWidth width after resample
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* \param nDestHeight height after resample
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*/
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void resamplePicture8Fast (const uint8 *pSrc, uint8 *pDest,
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sint32 nSrcWidth, sint32 nSrcHeight,
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sint32 nDestWidth, sint32 nDestHeight);
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/**
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* Quadratic interpolator
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* \return the interpolation in (x,y) of the values (xy**)
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@ -1785,7 +1785,7 @@ void CBitmap::releaseMipMaps()
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\*-------------------------------------------------------------------*/
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void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
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{
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nlassert(PixelFormat == RGBA);
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nlassert(PixelFormat == RGBA || PixelFormat == Luminance);
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bool needRebuild = false;
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// Deleting mipmaps
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@ -1804,6 +1804,9 @@ void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
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//logResample("Resample: 30");
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CObjectVector<uint8> pDestui;
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if (PixelFormat == RGBA)
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{
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pDestui.resize(nNewWidth*nNewHeight*4);
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//logResample("Resample: 40");
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NLMISC::CRGBA *pDestRgba = (NLMISC::CRGBA*)&pDestui[0];
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@ -1811,6 +1814,17 @@ void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
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resamplePicture32 ((NLMISC::CRGBA*)&_Data[0][0], pDestRgba, _Width, _Height, nNewWidth, nNewHeight);
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//logResample("Resample: 60");
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}
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else if (PixelFormat == Luminance)
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{
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pDestui.resize(nNewWidth*nNewHeight);
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//logResample("Resample: 40");
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uint8 *pDestGray = &pDestui[0];
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//logResample("Resample: 50");
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resamplePicture8 (&_Data[0][0], pDestGray, _Width, _Height, nNewWidth, nNewHeight);
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//logResample("Resample: 60");
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}
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NLMISC::contReset(_Data[0]); // free memory
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//logResample("Resample: 70");
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@ -2126,6 +2140,230 @@ void CBitmap::resamplePicture32Fast (const NLMISC::CRGBA *pSrc, NLMISC::CRGBA *p
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}
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/*-------------------------------------------------------------------*\
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resamplePicture32
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\*-------------------------------------------------------------------*/
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void CBitmap::resamplePicture8 (const uint8 *pSrc, uint8 *pDest,
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sint32 nSrcWidth, sint32 nSrcHeight,
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sint32 nDestWidth, sint32 nDestHeight)
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{
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//logResample("RP8: 0 pSrc=%p pDest=%p, Src=%d x %d Dest=%d x %d", pSrc, pDest, nSrcWidth, nSrcHeight, nDestWidth, nDestHeight);
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if ((nSrcWidth<=0)||(nSrcHeight<=0)||(nDestHeight<=0)||(nDestHeight<=0))
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return;
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// If we're reducing it by 2, call the fast resample
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if (((nSrcHeight / 2) == nDestHeight) && ((nSrcHeight % 2) == 0) &&
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((nSrcWidth / 2) == nDestWidth) && ((nSrcWidth % 2) == 0))
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{
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resamplePicture8Fast(pSrc, pDest, nSrcWidth, nSrcHeight, nDestWidth, nDestHeight);
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return;
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}
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bool bXMag=(nDestWidth>=nSrcWidth);
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bool bYMag=(nDestHeight>=nSrcHeight);
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bool bXEq=(nDestWidth==nSrcWidth);
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bool bYEq=(nDestHeight==nSrcHeight);
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std::vector<float> pIterm (nDestWidth*nSrcHeight);
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if (bXMag)
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{
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float fXdelta=(float)(nSrcWidth)/(float)(nDestWidth);
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float *pItermPtr=&*pIterm.begin();
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sint32 nY;
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for (nY=0; nY<nSrcHeight; nY++)
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{
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const uint8 *pSrcLine=pSrc;
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float fX=0.f;
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sint32 nX;
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for (nX=0; nX<nDestWidth; nX++)
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{
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float fVirgule=fX-(float)floor(fX);
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nlassert (fVirgule>=0.f);
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float vColor;
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if (fVirgule>=0.5f)
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{
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if (fX<(float)(nSrcWidth-1))
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{
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float vColor1 (pSrcLine[(sint32)floor(fX)]);
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float vColor2 (pSrcLine[(sint32)floor(fX)+1]);
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vColor=vColor1*(1.5f-fVirgule)+vColor2*(fVirgule-0.5f);
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}
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else
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vColor = float(pSrcLine[(sint32)floor(fX)]);
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}
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else
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{
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if (fX>=1.f)
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{
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float vColor1 (pSrcLine[(sint32)floor(fX)]);
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float vColor2 (pSrcLine[(sint32)floor(fX)-1]);
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vColor = vColor1*(0.5f+fVirgule)+vColor2*(0.5f-fVirgule);
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}
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else
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vColor = float (pSrcLine[(sint32)floor(fX)]);
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}
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*(pItermPtr++)=vColor;
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fX+=fXdelta;
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}
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pSrc+=nSrcWidth;
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}
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}
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else if (bXEq)
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{
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float *pItermPtr=&*pIterm.begin();
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for (sint32 nY=0; nY<nSrcHeight; nY++)
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{
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const uint8 *pSrcLine=pSrc;
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sint32 nX;
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for (nX=0; nX<nDestWidth; nX++)
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*(pItermPtr++) = float (pSrcLine[nX]);
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pSrc+=nSrcWidth;
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}
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}
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else
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{
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double fXdelta=(double)(nSrcWidth)/(double)(nDestWidth);
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nlassert (fXdelta>1.f);
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float *pItermPtr=&*pIterm.begin();
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sint32 nY;
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for (nY=0; nY<nSrcHeight; nY++)
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{
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const uint8 *pSrcLine=pSrc;
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double fX=0.f;
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sint32 nX;
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for (nX=0; nX<nDestWidth; nX++)
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{
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float vColor = 0.f;
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double fFinal=fX+fXdelta;
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while ((fX<fFinal)&&((sint32)fX!=nSrcWidth))
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{
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double fNext=(double)floor (fX)+1.f;
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if (fNext>fFinal)
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fNext=fFinal;
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vColor+=((float)(fNext-fX))* float (pSrcLine[(sint32)floor(fX)]);
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fX=fNext;
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}
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fX = fFinal; // ensure fX == fFinal
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vColor/=(float)fXdelta;
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*(pItermPtr++)=vColor;
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}
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pSrc+=nSrcWidth;
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}
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}
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if (bYMag)
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{
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double fYdelta=(double)(nSrcHeight)/(double)(nDestHeight);
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sint32 nX;
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for (nX=0; nX<nDestWidth; nX++)
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{
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double fY=0.f;
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sint32 nY;
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for (nY=0; nY<nDestHeight; nY++)
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{
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double fVirgule=fY-(double)floor(fY);
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nlassert (fVirgule>=0.f);
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float vColor;
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if (fVirgule>=0.5f)
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{
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if (fY<(double)(nSrcHeight-1))
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{
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float vColor1=pIterm[((sint32)floor(fY))*nDestWidth+nX];
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float vColor2=pIterm[(((sint32)floor(fY))+1)*nDestWidth+nX];
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vColor=vColor1*(1.5f-(float)fVirgule)+vColor2*((float)fVirgule-0.5f);
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}
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else
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vColor=pIterm[((sint32)floor(fY))*nDestWidth+nX];
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}
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else
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{
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if (fY>=1.f)
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{
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float vColor1=pIterm[((sint32)floor(fY))*nDestWidth+nX];
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float vColor2=pIterm[(((sint32)floor(fY))-1)*nDestWidth+nX];
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vColor=vColor1*(0.5f+(float)fVirgule)+vColor2*(0.5f-(float)fVirgule);
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}
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else
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vColor=pIterm[((sint32)floor(fY))*nDestWidth+nX];
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}
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pDest[nX+nY*nDestWidth]=vColor;
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fY+=fYdelta;
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}
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}
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}
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else if (bYEq)
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{
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for (sint32 nX=0; nX<nDestWidth; nX++)
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{
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sint32 nY;
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for (nY=0; nY<nDestHeight; nY++)
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{
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pDest[nX+nY*nDestWidth]=pIterm[nY*nDestWidth+nX];
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}
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}
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}
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else
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{
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double fYdelta=(double)(nSrcHeight)/(double)(nDestHeight);
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nlassert (fYdelta>1.f);
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sint32 nX;
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for (nX=0; nX<nDestWidth; nX++)
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{
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double fY=0.f;
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sint32 nY;
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for (nY=0; nY<nDestHeight; nY++)
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{
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float vColor = 0.f;
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double fFinal=fY+fYdelta;
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while ((fY<fFinal)&&((sint32)fY!=nSrcHeight))
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{
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double fNext=(double)floor (fY)+1.f;
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if (fNext>fFinal)
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fNext=fFinal;
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vColor+=((float)(fNext-fY))*pIterm[((sint32)floor(fY))*nDestWidth+nX];
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fY=fNext;
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}
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vColor/=(float)fYdelta;
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pDest[nX+nY*nDestWidth]=vColor;
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}
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}
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}
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}
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/*-------------------------------------------------------------------*\
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resamplePicture8Fast
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\*-------------------------------------------------------------------*/
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void CBitmap::resamplePicture8Fast (const uint8 *pSrc, uint8 *pDest,
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sint32 nSrcWidth, sint32 nSrcHeight,
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sint32 nDestWidth, sint32 nDestHeight)
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{
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// the image is divided by two : 1 pixel in dest = 4 pixels in src
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// the resulting pixel in dest is an average of the four pixels in src
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nlassert(nSrcWidth % 2 == 0);
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nlassert(nSrcHeight % 2 == 0);
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nlassert(nSrcWidth / 2 == nDestWidth);
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nlassert(nSrcHeight / 2 == nDestHeight);
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sint32 x, y, twoX, twoSrcWidthByY;
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for (y=0 ; y<nDestHeight ; y++)
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{
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twoSrcWidthByY = 2*nSrcWidth*y;
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for (x=0 ; x<nDestWidth ; x++)
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{
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twoX = 2*x;
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pDest[x+y*nDestWidth] = (
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(uint)pSrc[twoX + twoSrcWidthByY ]+
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(uint)pSrc[twoX + twoSrcWidthByY + nSrcWidth ]+
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(uint)pSrc[twoX+1 + twoSrcWidthByY ]+
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(uint)pSrc[twoX+1 + twoSrcWidthByY + nSrcWidth ]+1)>>2;
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}
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}
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}
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/*-------------------------------------------------------------------*\
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readTGA
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