Improvements in CIE Lab conversion code. Start moving YCbCr stuff to the
tif_color.c module.
This commit is contained in:
Andrey Kiselev
parent
77010a7c62
commit
6d52b5d379
@ -1,4 +1,4 @@
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/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_color.c,v 1.1 2003-11-13 19:46:39 dron Exp $ */
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/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_color.c,v 1.2 2003-12-03 19:54:03 dron Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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@ -27,7 +27,7 @@
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/*
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* CIE L*a*b* to CIE XYZ and CIE XYZ to RGB conversion routines are taken
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* from the VIPS library (http://www.vips.ecs.soton.ac.uk) with
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* the permission of John Cupitt, the author.
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* the permission of John Cupitt, the VIPS author.
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*/
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/*
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@ -44,31 +44,31 @@
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* reference white tristimuli can be specified.
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*/
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void
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TIFFCIELabToXYZ(uint32 l, int32 a, int32 b, float *X, float *Y, float *Z,
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float X0, float Y0, float Z0)
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TIFFCIELabToXYZ(TIFFCIELabToRGB *cielab, uint32 l, int32 a, int32 b,
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float *X, float *Y, float *Z)
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{
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float L = (float)l * 100.0 / 255.0;
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float cby, tmp;
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if( L < 8.856 ) {
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*Y = (L * Y0) / 903.292;
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cby = 7.787 * (*Y / Y0) + 16.0 / 116.0;
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*Y = (L * cielab->Y0) / 903.292;
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cby = 7.787 * (*Y / cielab->Y0) + 16.0 / 116.0;
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} else {
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cby = (L + 16.0) / 116.0;
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*Y = Y0 * cby * cby * cby;
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*Y = cielab->Y0 * cby * cby * cby;
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}
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tmp = (double)a / 500.0 + cby;
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if( tmp < 0.2069 )
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*X = X0 * (tmp - 0.13793) / 7.787;
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*X = cielab->X0 * (tmp - 0.13793) / 7.787;
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else
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*X = X0 * tmp * tmp * tmp;
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*X = cielab->X0 * tmp * tmp * tmp;
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tmp = cby - (double)b / 200.0;
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if( tmp < 0.2069 )
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*Z = Z0 * (tmp - 0.13793) / 7.787;
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*Z = cielab->Z0 * (tmp - 0.13793) / 7.787;
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else
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*Z = Z0 * tmp * tmp * tmp;
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*Z = cielab->Z0 * tmp * tmp * tmp;
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}
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/*
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@ -116,118 +116,170 @@ TIFFXYZToRGB(TIFFCIELabToRGB *cielab, float X, float Y, float Z,
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* the Yr,Yb,Yg <=> r,g,b conversions.
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*/
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int
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TIFFCIELabToRGBInit(TIFFCIELabToRGB** cielab)
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TIFFCIELabToRGBInit(TIFFCIELabToRGB* cielab, TIFFDisplay *display,
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float X0, float Y0, float Z0)
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{
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static char module[] = "TIFFCIELabToRGBInit";
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int i;
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float gamma;
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TIFFDisplay sRGB_display = {
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{ /* XYZ -> luminance matrix */
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{ 3.2410, -1.5374, -0.4986 },
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{ -0.9692, 1.8760, 0.0416 },
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{ 0.0556, -0.2040, 1.0570 }
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},
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100, 100, 100, /* Light o/p for reference white */
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255, 255, 255, /* Pixel values for ref. white */
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1, 1, 1, /* Residual light o/p for black pixel */
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2.4, 2.4, 2.4, /* Gamma values for the three guns */
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};
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cielab->range = 1500;
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if (!(*cielab)) {
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*cielab = (TIFFCIELabToRGB *)
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_TIFFmalloc(sizeof(TIFFCIELabToRGB));
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if (*cielab == NULL) {
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TIFFError(module,
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"No space for CIE L*a*b* control structure");
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return -1;
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}
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(*cielab)->range = 1500;
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(*cielab)->display =
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(TIFFDisplay *)_TIFFmalloc(sizeof(TIFFDisplay));
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if ((*cielab) == NULL) {
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TIFFError(module, "No space for display structure");
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_TIFFfree(*cielab);
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*cielab = 0;
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return -1;
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}
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(*cielab)->Yr2r = (float *)
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_TIFFmalloc(((*cielab)->range + 1) * sizeof(float));
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if ((*cielab)->Yr2r == NULL) {
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TIFFError(module, "No space for Red conversion array");
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_TIFFfree((*cielab)->display);
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_TIFFfree(*cielab);
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*cielab = 0;
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return -1;
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}
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(*cielab)->Yg2g = (float *)
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_TIFFmalloc(((*cielab)->range + 1) * sizeof(float));
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if ((*cielab)->Yg2g == NULL) {
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TIFFError(module,
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"No space for Green conversion array");
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_TIFFfree((*cielab)->Yr2r);
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_TIFFfree((*cielab)->display);
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_TIFFfree(*cielab);
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*cielab = 0;
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return -1;
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}
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(*cielab)->Yb2b = (float *)
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_TIFFmalloc(((*cielab)->range + 1) * sizeof(float));
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if ((*cielab)->Yb2b == NULL) {
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TIFFError(module, "No space for Blue conversion array");
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_TIFFfree((*cielab)->Yb2b);
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_TIFFfree((*cielab)->Yr2r);
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_TIFFfree((*cielab)->display);
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_TIFFfree(*cielab);
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*cielab = 0;
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return -1;
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}
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_TIFFmemcpy((*cielab)->display, &sRGB_display,
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sizeof(TIFFDisplay));
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cielab->display = (TIFFDisplay *)_TIFFmalloc(sizeof(TIFFDisplay));
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if (cielab == NULL) {
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TIFFError(module, "No space for display structure");
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return -1;
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}
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cielab->Yr2r = (float *)
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_TIFFmalloc((cielab->range + 1) * sizeof(float));
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if (cielab->Yr2r == NULL) {
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TIFFError(module, "No space for Red conversion array");
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_TIFFfree(cielab->display);
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return -1;
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}
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cielab->Yg2g = (float *)
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_TIFFmalloc((cielab->range + 1) * sizeof(float));
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if (cielab->Yg2g == NULL) {
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TIFFError(module,
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"No space for Green conversion array");
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_TIFFfree(cielab->Yr2r);
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_TIFFfree(cielab->display);
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return -1;
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}
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cielab->Yb2b = (float *)
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_TIFFmalloc((cielab->range + 1) * sizeof(float));
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if (cielab->Yb2b == NULL) {
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TIFFError(module, "No space for Blue conversion array");
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_TIFFfree(cielab->Yb2b);
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_TIFFfree(cielab->Yr2r);
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_TIFFfree(cielab->display);
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return -1;
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}
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_TIFFmemcpy(cielab->display, display, sizeof(TIFFDisplay));
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/* Red */
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gamma = 1.0 / (*cielab)->display->d_gammaR ;
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(*cielab)->rstep =
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((*cielab)->display->d_YCR - (*cielab)->display->d_Y0R)
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/ (*cielab)->range;
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for(i = 0; i <= (*cielab)->range; i++) {
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(*cielab)->Yr2r[i] =
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(*cielab)->display->d_Vrwr
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* (pow((double)i / (*cielab)->range, gamma));
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gamma = 1.0 / cielab->display->d_gammaR ;
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cielab->rstep =
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(cielab->display->d_YCR - cielab->display->d_Y0R)
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/ cielab->range;
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for(i = 0; i <= cielab->range; i++) {
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cielab->Yr2r[i] = cielab->display->d_Vrwr
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* (pow((double)i / cielab->range, gamma));
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}
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/* Green */
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gamma = 1.0 / (*cielab)->display->d_gammaG ;
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(*cielab)->gstep =
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((*cielab)->display->d_YCR - (*cielab)->display->d_Y0R)
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/ (*cielab)->range;
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for(i = 0; i <= (*cielab)->range; i++) {
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(*cielab)->Yg2g[i] =
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(*cielab)->display->d_Vrwg
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* (pow((double)i / (*cielab)->range, gamma));
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gamma = 1.0 / cielab->display->d_gammaG ;
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cielab->gstep =
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(cielab->display->d_YCR - cielab->display->d_Y0R)
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/ cielab->range;
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for(i = 0; i <= cielab->range; i++) {
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cielab->Yg2g[i] = cielab->display->d_Vrwg
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* (pow((double)i / cielab->range, gamma));
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}
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/* Blue */
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gamma = 1.0 / (*cielab)->display->d_gammaB ;
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(*cielab)->bstep =
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((*cielab)->display->d_YCR - (*cielab)->display->d_Y0R)
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/ (*cielab)->range;
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for(i = 0; i <= (*cielab)->range; i++) {
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(*cielab)->Yb2b[i] =
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(*cielab)->display->d_Vrwb
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* (pow((double)i / (*cielab)->range, gamma));
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gamma = 1.0 / cielab->display->d_gammaB ;
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cielab->bstep =
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(cielab->display->d_YCR - cielab->display->d_Y0R)
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/ cielab->range;
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for(i = 0; i <= cielab->range; i++) {
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cielab->Yb2b[i] = cielab->display->d_Vrwb
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* (pow((double)i / cielab->range, gamma));
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}
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/* Init reference white point */
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cielab->X0 = X0;
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cielab->Y0 = Y0;
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cielab->Z0 = Z0;
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return 0;
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}
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/*
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* Free TIFFYCbCrToRGB structure.
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*/
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int
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TIFFCIELabToRGBEnd(TIFFCIELabToRGB* cielab)
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{
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static char module[] = "TIFFCIELabToRGBEnd";
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_TIFFfree(cielab->Yr2r);
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_TIFFfree(cielab->Yg2g);
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_TIFFfree(cielab->Yb2b);
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_TIFFfree(cielab->display);
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}
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#define SHIFT 16
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#define FIX(x) ((int32)((x) * (1L<<SHIFT) + 0.5))
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#define ONE_HALF ((int32)(1<<(SHIFT-1)))
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/*
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* Initialize the YCbCr->RGB conversion tables. The conversion
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* is done according to the 6.0 spec:
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*
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* R = Y + Cr*(2 - 2*LumaRed)
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* B = Y + Cb*(2 - 2*LumaBlue)
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* G = Y
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* - LumaBlue*Cb*(2-2*LumaBlue)/LumaGreen
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* - LumaRed*Cr*(2-2*LumaRed)/LumaGreen
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*
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* To avoid floating point arithmetic the fractional constants that
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* come out of the equations are represented as fixed point values
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* in the range 0...2^16. We also eliminate multiplications by
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* pre-calculating possible values indexed by Cb and Cr (this code
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* assumes conversion is being done for 8-bit samples).
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*/
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int
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TIFFYCbCrToRGBInit(TIFFYCbCrToRGB* ycbcr,
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float LumaRed, float LumaGreen, float LumaBlue)
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{
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TIFFRGBValue* clamptab;
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int i;
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clamptab = (TIFFRGBValue*)(
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(tidata_t) ycbcr+TIFFroundup(sizeof (TIFFYCbCrToRGB), sizeof (long)));
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_TIFFmemset(clamptab, 0, 256); /* v < 0 => 0 */
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ycbcr->clamptab = (clamptab += 256);
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for (i = 0; i < 256; i++)
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clamptab[i] = (TIFFRGBValue) i;
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_TIFFmemset(clamptab+256, 255, 2*256); /* v > 255 => 255 */
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{ float f1 = 2-2*LumaRed; int32 D1 = FIX(f1);
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float f2 = LumaRed*f1/LumaGreen; int32 D2 = -FIX(f2);
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float f3 = 2-2*LumaBlue; int32 D3 = FIX(f3);
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float f4 = LumaBlue*f3/LumaGreen; int32 D4 = -FIX(f4);
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int x;
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ycbcr->Cr_r_tab = (int*) (clamptab + 3*256);
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ycbcr->Cb_b_tab = ycbcr->Cr_r_tab + 256;
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ycbcr->Cr_g_tab = (int32*) (ycbcr->Cb_b_tab + 256);
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ycbcr->Cb_g_tab = ycbcr->Cr_g_tab + 256;
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/*
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* i is the actual input pixel value in the range 0..255
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* Cb and Cr values are in the range -128..127 (actually
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* they are in a range defined by the ReferenceBlackWhite
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* tag) so there is some range shifting to do here when
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* constructing tables indexed by the raw pixel data.
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*
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* XXX handle ReferenceBlackWhite correctly to calculate
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* Cb/Cr values to use in constructing the tables.
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*/
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for (i = 0, x = -128; i < 256; i++, x++) {
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ycbcr->Cr_r_tab[i] = (int)((D1*x + ONE_HALF)>>SHIFT);
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ycbcr->Cb_b_tab[i] = (int)((D3*x + ONE_HALF)>>SHIFT);
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ycbcr->Cr_g_tab[i] = D2*x;
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ycbcr->Cb_g_tab[i] = D4*x + ONE_HALF;
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}
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}
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return 0;
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}
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#undef SHIFT
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#undef ONE_HALF
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#undef FIX
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@ -1,4 +1,4 @@
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/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_getimage.c,v 1.30 2003-12-03 15:40:14 dron Exp $ */
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/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_getimage.c,v 1.31 2003-12-03 19:54:03 dron Exp $ */
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/*
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* Copyright (c) 1991-1997 Sam Leffler
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@ -42,9 +42,28 @@ static int pickTileSeparateCase(TIFFRGBAImage*);
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static const char photoTag[] = "PhotometricInterpretation";
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/*
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* Helper constants used in Orientation tag handling
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*/
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#define FLIP_VERTICALLY 0x01
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#define FLIP_HORIZONTALLY 0x02
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/*
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* Color conversion constants. We will define display types here.
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*/
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TIFFDisplay display_sRGB = {
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{ /* XYZ -> luminance matrix */
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{ 3.2410, -1.5374, -0.4986 },
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{ -0.9692, 1.8760, 0.0416 },
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{ 0.0556, -0.2040, 1.0570 }
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},
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100, 100, 100, /* Light o/p for reference white */
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255, 255, 255, /* Pixel values for ref. white */
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1, 1, 1, /* Residual light o/p for black pixel */
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2.4, 2.4, 2.4, /* Gamma values for the three guns */
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};
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/*
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* Check the image to see if TIFFReadRGBAImage can deal with it.
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* 1/0 is returned according to whether or not the image can
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@ -174,10 +193,7 @@ TIFFRGBAImageEnd(TIFFRGBAImage* img)
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if (img->ycbcr)
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_TIFFfree(img->ycbcr), img->ycbcr = NULL;
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if (img->cielab) {
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_TIFFfree(img->cielab->Yr2r);
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_TIFFfree(img->cielab->Yg2g);
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_TIFFfree(img->cielab->Yb2b);
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_TIFFfree(img->cielab->display);
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TIFFCIELabToRGBEnd(img->cielab);
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_TIFFfree(img->cielab), img->cielab = NULL;
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}
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@ -1540,11 +1556,11 @@ DECLAREContigPutFunc(putcontig8bitCIELab)
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fromskew *= 3;
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while (h-- > 0) {
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for (x = w; x-- > 0;) {
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TIFFCIELabToXYZ((u_char)pp[0],
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TIFFCIELabToXYZ(img->cielab,
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(u_char)pp[0],
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(signed char)pp[1],
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(signed char)pp[2],
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&X, &Y, &Z,
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D50_X0, D50_Y0, D50_Z0);
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&X, &Y, &Z);
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TIFFXYZToRGB(img->cielab, X, Y, Z, &r, &g, &b);
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*cp++ = PACK(r, g, b);
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pp += 3;
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@ -2005,128 +2021,76 @@ DECLAREContigPutFunc(putcontig8bitYCbCr11tile)
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#undef YCbCrSetup
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#undef YCbCrtoRGB
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#define LumaRed coeffs[0]
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#define LumaGreen coeffs[1]
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#define LumaBlue coeffs[2]
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#define SHIFT 16
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#define FIX(x) ((int32)((x) * (1L<<SHIFT) + 0.5))
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#define ONE_HALF ((int32)(1<<(SHIFT-1)))
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/*
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* Initialize the YCbCr->RGB conversion tables. The conversion
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* is done according to the 6.0 spec:
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*
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* R = Y + Cr*(2 - 2*LumaRed)
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* B = Y + Cb*(2 - 2*LumaBlue)
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* G = Y
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* - LumaBlue*Cb*(2-2*LumaBlue)/LumaGreen
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* - LumaRed*Cr*(2-2*LumaRed)/LumaGreen
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*
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* To avoid floating point arithmetic the fractional constants that
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* come out of the equations are represented as fixed point values
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* in the range 0...2^16. We also eliminate multiplications by
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* pre-calculating possible values indexed by Cb and Cr (this code
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* assumes conversion is being done for 8-bit samples).
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*/
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||||
static void
|
||||
TIFFYCbCrToRGBInit(TIFFYCbCrToRGB* ycbcr, TIFF* tif)
|
||||
{
|
||||
TIFFRGBValue* clamptab;
|
||||
float* coeffs;
|
||||
int i;
|
||||
|
||||
clamptab = (TIFFRGBValue*)(
|
||||
(tidata_t) ycbcr+TIFFroundup(sizeof (TIFFYCbCrToRGB), sizeof (long)));
|
||||
_TIFFmemset(clamptab, 0, 256); /* v < 0 => 0 */
|
||||
ycbcr->clamptab = (clamptab += 256);
|
||||
for (i = 0; i < 256; i++)
|
||||
clamptab[i] = (TIFFRGBValue) i;
|
||||
_TIFFmemset(clamptab+256, 255, 2*256); /* v > 255 => 255 */
|
||||
TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRCOEFFICIENTS, &coeffs);
|
||||
_TIFFmemcpy(ycbcr->coeffs, coeffs, 3*sizeof (float));
|
||||
{ float f1 = 2-2*LumaRed; int32 D1 = FIX(f1);
|
||||
float f2 = LumaRed*f1/LumaGreen; int32 D2 = -FIX(f2);
|
||||
float f3 = 2-2*LumaBlue; int32 D3 = FIX(f3);
|
||||
float f4 = LumaBlue*f3/LumaGreen; int32 D4 = -FIX(f4);
|
||||
int x;
|
||||
|
||||
ycbcr->Cr_r_tab = (int*) (clamptab + 3*256);
|
||||
ycbcr->Cb_b_tab = ycbcr->Cr_r_tab + 256;
|
||||
ycbcr->Cr_g_tab = (int32*) (ycbcr->Cb_b_tab + 256);
|
||||
ycbcr->Cb_g_tab = ycbcr->Cr_g_tab + 256;
|
||||
/*
|
||||
* i is the actual input pixel value in the range 0..255
|
||||
* Cb and Cr values are in the range -128..127 (actually
|
||||
* they are in a range defined by the ReferenceBlackWhite
|
||||
* tag) so there is some range shifting to do here when
|
||||
* constructing tables indexed by the raw pixel data.
|
||||
*
|
||||
* XXX handle ReferenceBlackWhite correctly to calculate
|
||||
* Cb/Cr values to use in constructing the tables.
|
||||
*/
|
||||
for (i = 0, x = -128; i < 256; i++, x++) {
|
||||
ycbcr->Cr_r_tab[i] = (int)((D1*x + ONE_HALF)>>SHIFT);
|
||||
ycbcr->Cb_b_tab[i] = (int)((D3*x + ONE_HALF)>>SHIFT);
|
||||
ycbcr->Cr_g_tab[i] = D2*x;
|
||||
ycbcr->Cb_g_tab[i] = D4*x + ONE_HALF;
|
||||
}
|
||||
}
|
||||
}
|
||||
#undef SHIFT
|
||||
#undef ONE_HALF
|
||||
#undef FIX
|
||||
#undef LumaBlue
|
||||
#undef LumaGreen
|
||||
#undef LumaRed
|
||||
|
||||
static tileContigRoutine
|
||||
initYCbCrConversion(TIFFRGBAImage* img)
|
||||
{
|
||||
uint16 hs, vs;
|
||||
static char module[] = "initCIELabConversion";
|
||||
|
||||
float *coeffs;
|
||||
uint16 hs, vs;
|
||||
|
||||
if (img->ycbcr == NULL) {
|
||||
img->ycbcr = (TIFFYCbCrToRGB*) _TIFFmalloc(
|
||||
TIFFroundup(sizeof (TIFFYCbCrToRGB), sizeof (long))
|
||||
+ 4*256*sizeof (TIFFRGBValue)
|
||||
+ 2*256*sizeof (int)
|
||||
+ 2*256*sizeof (int32)
|
||||
);
|
||||
if (img->ycbcr == NULL) {
|
||||
TIFFError(TIFFFileName(img->tif),
|
||||
"No space for YCbCr->RGB conversion state");
|
||||
return (NULL);
|
||||
img->ycbcr = (TIFFYCbCrToRGB*) _TIFFmalloc(
|
||||
TIFFroundup(sizeof (TIFFYCbCrToRGB), sizeof (long))
|
||||
+ 4*256*sizeof (TIFFRGBValue)
|
||||
+ 2*256*sizeof (int)
|
||||
+ 2*256*sizeof (int32)
|
||||
);
|
||||
if (img->ycbcr == NULL) {
|
||||
TIFFError(module,
|
||||
"No space for YCbCr->RGB conversion state");
|
||||
return (NULL);
|
||||
}
|
||||
}
|
||||
TIFFYCbCrToRGBInit(img->ycbcr, img->tif);
|
||||
} else {
|
||||
float* coeffs;
|
||||
|
||||
TIFFGetFieldDefaulted(img->tif, TIFFTAG_YCBCRCOEFFICIENTS, &coeffs);
|
||||
if (_TIFFmemcmp(coeffs, img->ycbcr->coeffs, 3*sizeof (float)) != 0)
|
||||
TIFFYCbCrToRGBInit(img->ycbcr, img->tif);
|
||||
}
|
||||
/*
|
||||
* The 6.0 spec says that subsampling must be
|
||||
* one of 1, 2, or 4, and that vertical subsampling
|
||||
* must always be <= horizontal subsampling; so
|
||||
* there are only a few possibilities and we just
|
||||
* enumerate the cases.
|
||||
*/
|
||||
TIFFGetFieldDefaulted(img->tif, TIFFTAG_YCBCRSUBSAMPLING, &hs, &vs);
|
||||
switch ((hs<<4)|vs) {
|
||||
case 0x44: return (putcontig8bitYCbCr44tile);
|
||||
case 0x42: return (putcontig8bitYCbCr42tile);
|
||||
case 0x41: return (putcontig8bitYCbCr41tile);
|
||||
case 0x22: return (putcontig8bitYCbCr22tile);
|
||||
case 0x21: return (putcontig8bitYCbCr21tile);
|
||||
case 0x11: return (putcontig8bitYCbCr11tile);
|
||||
}
|
||||
return (NULL);
|
||||
if (TIFFYCbCrToRGBInit(img->ycbcr,
|
||||
coeffs[0], coeffs[1], coeffs[2]) < 0)
|
||||
return NULL;
|
||||
|
||||
/*
|
||||
* The 6.0 spec says that subsampling must be
|
||||
* one of 1, 2, or 4, and that vertical subsampling
|
||||
* must always be <= horizontal subsampling; so
|
||||
* there are only a few possibilities and we just
|
||||
* enumerate the cases.
|
||||
*/
|
||||
TIFFGetFieldDefaulted(img->tif, TIFFTAG_YCBCRSUBSAMPLING, &hs, &vs);
|
||||
switch ((hs<<4)|vs) {
|
||||
case 0x44: return (putcontig8bitYCbCr44tile);
|
||||
case 0x42: return (putcontig8bitYCbCr42tile);
|
||||
case 0x41: return (putcontig8bitYCbCr41tile);
|
||||
case 0x22: return (putcontig8bitYCbCr22tile);
|
||||
case 0x21: return (putcontig8bitYCbCr21tile);
|
||||
case 0x11: return (putcontig8bitYCbCr11tile);
|
||||
}
|
||||
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
static tileContigRoutine
|
||||
initCIELabToRGBConversion(TIFFRGBAImage* img)
|
||||
initCIELabConversion(TIFFRGBAImage* img)
|
||||
{
|
||||
TIFFCIELabToRGBInit(&img->cielab);
|
||||
static char module[] = "initCIELabConversion";
|
||||
|
||||
if (!img->cielab) {
|
||||
img->cielab = (TIFFCIELabToRGB *)
|
||||
_TIFFmalloc(sizeof(TIFFCIELabToRGB));
|
||||
if (!img->cielab) {
|
||||
TIFFError(module,
|
||||
"No space for CIE L*a*b*->RGB conversion state.");
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
if (TIFFCIELabToRGBInit(img->cielab, &display_sRGB,
|
||||
D50_X0, D50_Y0, D50_Z0) < 0) {
|
||||
TIFFError(module,
|
||||
"Failed to initialize CIE L*a*b*->RGB conversion state.");
|
||||
_TIFFfree(img->cielab);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return putcontig8bitCIELab;
|
||||
}
|
||||
|
||||
@ -2430,7 +2394,7 @@ pickTileContigCase(TIFFRGBAImage* img)
|
||||
break;
|
||||
case PHOTOMETRIC_CIELAB:
|
||||
if (img->bitspersample == 8)
|
||||
put = initCIELabToRGBConversion(img);
|
||||
put = initCIELabConversion(img);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tiffio.h,v 1.21 2003-12-03 15:40:14 dron Exp $ */
|
||||
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tiffio.h,v 1.22 2003-12-03 19:54:03 dron Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1988-1997 Sam Leffler
|
||||
@ -153,7 +153,8 @@ typedef struct { /* YCbCr->RGB support */
|
||||
int* Cb_b_tab;
|
||||
int32* Cr_g_tab;
|
||||
int32* Cb_g_tab;
|
||||
float coeffs[3]; /* cached for repeated use */
|
||||
float coeffs[3]; /* XXX: no longer required. Will
|
||||
be removed in the future. */
|
||||
} TIFFYCbCrToRGB;
|
||||
|
||||
typedef struct { /* CIE Lab 1976->RGB support */
|
||||
@ -163,14 +164,20 @@ typedef struct { /* CIE Lab 1976->RGB support */
|
||||
float* Yg2g; /* Conversion of Yg to g */
|
||||
float* Yb2b; /* Conversion of Yb to b */
|
||||
float rstep, gstep, bstep;
|
||||
float X0, Y0, Z0; /* Reference white point */
|
||||
} TIFFCIELabToRGB;
|
||||
|
||||
extern int TIFFCIELabToRGBInit(TIFFCIELabToRGB**);
|
||||
extern void TIFFCIELabToXYZ(uint32, int32, int32, float *, float *, float *,
|
||||
float, float, float);
|
||||
extern int TIFFCIELabToRGBInit(TIFFCIELabToRGB*, TIFFDisplay *display,
|
||||
float X0, float Y0, float Z0);
|
||||
extern int TIFFCIELabToRGBEnd(TIFFCIELabToRGB*);
|
||||
extern void TIFFCIELabToXYZ(TIFFCIELabToRGB *, uint32, int32, int32,
|
||||
float *, float *, float *);
|
||||
extern void TIFFXYZToRGB(TIFFCIELabToRGB *, float, float, float,
|
||||
uint32 *, uint32 *, uint32 *);
|
||||
|
||||
extern int
|
||||
TIFFYCbCrToRGBInit(TIFFYCbCrToRGB*, float, float, float);
|
||||
|
||||
/*
|
||||
* RGBA-style image support.
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user