Dear group,
Forget it. I did indeed something dead wrong :)
The image has (unexpected) different sizes in the comparison.
I'm sorry for bothering.
Jos
Jos De Laender schreef:
> Dear group,
>
> Probably I'm doing something dead wrong, but using your lcms2 library in
> my own application, I seem to note a 50%-100% performance drop going
> from lcms to lcms2.
> The piece of code is, I think, pretty straightforward and goes
> hereafter. What am I doing wrong or what are the suggestions ?
> (For your reference, it's a piece of code that transforms a linear image
> representation to a screen, using a profile). OMP I took out of the
> equation.
>
> Thanks for the library, thanks for the feedback !
>
> Code :
>
> QTime Time;
> Time.start();
>
> if (m_OutProfile) {
>
> // Some lcms initialization.
> cmsCIExyY D65;
> cmsCIExyY D50;
>
> cmsSetLogErrorHandler(lcmsError);
> cmsWhitePointFromTemp(&D65,6503);
> cmsWhitePointFromTemp(&D50,5003);
>
> cmsToneCurve* GammaCurve = cmsBuildGamma(NULL,1.0);
> cmsToneCurve* GammaCurves[] = {GammaCurve,GammaCurve,GammaCurve};
>
> cmsHPROFILE InProfile = 0;
>
> cmsCIExyY DFromReference;
>
> short ColorSpace = m_RelatedImage->m_ColorSpace;
>
> switch (ColorSpace) {
> case dlSpace_sRGB_D65 :
> case dlSpace_AdobeRGB_D65 :
> DFromReference = D65;
> break;
> case dlSpace_WideGamutRGB_D50 :
> case dlSpace_ProPhotoRGB_D50 :
> DFromReference = D50;
> break;
> default:
> DL_ERROR(Error_SwitchCase,"Unexpected switch
> case","%d",ColorSpace);
> }
>
> InProfile =
> cmsCreateRGBProfile(&DFromReference,
> (cmsCIExyYTRIPLE*)&RGBPrimaries[ColorSpace],
> GammaCurves);
> if (!InProfile) {
> DL_ERROR(Error_Profile,"Could not open profile","%s","InProfile");
> }
>
> cmsFreeToneCurve(GammaCurve);
>
> cmsHTRANSFORM Transform;
> Transform = cmsCreateTransform(InProfile,
> TYPE_RGBA_8,
> m_OutProfile,
> TYPE_RGBA_8,
> m_Intent,
> 0);
> // Addition of those drops
> performance even further.
> //cmsFLAGS_NOOPTIMIZE |
> //cmsFLAGS_BLACKPOINTCOMPENSATION);
> TRACEKEYVALS("Elapsed","%d",Time.elapsed());
>
> TRACEKEYVALS("cmsDoTransform on QImage","%p",m_QImageZoomed);
> const uint32_t Size = m_ZoomWidth*m_ZoomHeight;
> short NrTiles = 1;
> #ifdef _OPENMP
> // XXX JDLA NrTiles = omp_get_num_threads();
> #endif
> uint32_t Step = Size/NrTiles;
> #pragma omp parallel for default(shared) schedule(static)
> for (short Tile=0; Tile<NrTiles; Tile++) {
> uint32_t Start = Tile*Step;
> uint32_t End = (Tile == NrTiles-1) ? Size : Start+Step;
> cmsDoTransform(Transform,
> m_QImageZoomed->bits()+Start*4,
> m_QImageZoomed->bits()+Start*4,
> End-Start);
> }
>
> cmsDeleteTransform(Transform);
> cmsCloseProfile(InProfile);
>
> }
>
> TRACEKEYVALS("Elapsed","%d",Time.elapsed());
> }
>
>
--
Jos De Laender
www.jodela.net
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