setclrs.c
上传用户:zhongxx05
上传日期:2007-06-06
资源大小:33641k
文件大小:9k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "env.h" /* standard libraries & #defines */
- #define YUV_MAIN /* declare all yuv-specific data here */
- #include "yuv.h" /* YUV-to-RGB conversion tables & macros */
- #include "clip.h" /* macros for clipping & dithering */
- #include "colorlib.h" /* ensure that prototypes get extern C'ed */
- /* from env.c: */
- extern int CheckCPUType ();
- /* from rgbpal.c: */
- extern void InitializePalettes ();
- /* from clip.c: */
- extern void InitializeClipTables ();
- /* current color adjustment parameters: */
- static int color_conversion_tables_inited = 0;
- static float cur_brightness, cur_contrast, cur_saturation, cur_hue;
- /*
- * Convert a value in the range of [-1,1],
- * to a new range [l,h]; with a middle value equal to m.
- */
- static double chrange (double x, double l, double m, double h)
- {
- if (x >= 0.) {
- if (x > 1.) x = 1.;
- x = m + (h - m) * x;
- } else {
- if (x < -1.) x = -1.;
- x = m + (m - l) * x;
- }
- return x;
- }
- /*
- * Checks if variable is signicantly different from zero.
- */
- static int is (double val)
- {
- return fabs(val) > 0.01; /* < 1% is not considered a change */
- }
- /*
- * Returns current state of "from/to I420" converters.
- * Use:
- * void GetSrcI420Colors (float *brightness, float *contrast, float *saturation, float *hue);
- * Output:
- * brightness - brightness adjustment [-1,1], 0 - default;
- * contrast - contrast adjustment [-1,1], 0 - default;
- * saturation - saturation adjustment [-1,1], 0 - default;
- * hue - hue adjustment [-1,1], 0 - default;
- * Returns:
- * none.
- */
- void GetSrcI420Colors (float *brightness, float *contrast, float *saturation, float *hue)
- {
- if (brightness && contrast && saturation && hue)
- {
- *brightness = cur_brightness;
- *contrast = cur_contrast;
- *saturation = cur_saturation;
- *hue = cur_hue;
- }
- }
- /*
- * Initializes "from/to I420" converters.
- * Use:
- * void SetSrcI420Colors (float brightness, float contrast, float saturation, float hue);
- * void SetDestI420Colors (float brightness, float contrast, float saturation, float hue);
- * Input:
- * brightness - brightness adjustment [-1,1], 0 - default;
- * contrast - contrast adjustment [-1,1], 0 - default;
- * saturation - saturation adjustment [-1,1], 0 - default;
- * hue - hue adjustment [-1,1], 0 - default;
- * Returns:
- * none.
- */
- void SetSrcI420Colors (float brightness, float contrast, float saturation, float hue)
- {
- /* check if we have never been called: */
- if (!color_conversion_tables_inited) {
- /* identify type of CPU used: */
- CheckCPUType ();
- /* initialize clipping tables: */
- InitializeClipTables ();
- /* set default palettes for RGB8 formats: */
- #if defined _FAT_HXCOLOR || defined HELIX_FEATURE_CC_RGB8out
- InitializePalettes ();
- #endif
- /* set indicator: */
- color_conversion_tables_inited ++;
- goto regenerate_tables;
- }
- /* check if we need to re-generate color conversion tables: */
- if (is (cur_brightness - brightness) ||
- is (cur_contrast - contrast) ||
- is (cur_saturation - saturation) ||
- is (cur_hue - hue)) {
- /* process color-adjustment parameters: */
- double alpha, beta, gamma, kappa, lambda;
- double cos_alpha, xi_sin_alpha, minus_zeta_sin_alpha;
- register int i;
- regenerate_tables:
- /* hue: */
- alpha = chrange (hue, ALPHA_MIN, ALPHA_MED, ALPHA_MAX);
- cos_alpha = cos (alpha);
- xi_sin_alpha = XI * sin (alpha);
- minus_zeta_sin_alpha = -ZETA * sin (alpha);
- is_alpha = is (cur_hue = hue);
- /* saturation: */
- beta = chrange (saturation, BETA_MIN, BETA_MED, BETA_MAX);
- is_beta = is (cur_saturation = saturation);
- /* brightness: */
- gamma = chrange (brightness, GAMMA_MIN, GAMMA_MED, GAMMA_MAX);
- is_gamma = is (cur_brightness = brightness);
- /* contrast: */
- kappa = chrange (contrast, KAPPA_MIN, KAPPA_MED, KAPPA_MAX);
- lambda = LAMBDA (kappa);
- is_kappa = is (cur_contrast = contrast);
- /* generate color conversion tables: */
- for (i = 0; i < 256; i++) {
- /* Y'Cr'Cb'->R'G'B' conversion tables: */
- double y = lambda + (i - CCIR601_YOFFSET) * kappa; /* adjust contrast */
- if (y < 0) y = 0; else if (y > CCIR601_YMAX) y = CCIR601_YMAX;
- ytab [i] = NEAREST_INT(y * YCOEF * gamma);
- rvtab [i] = NEAREST_INT((i-CCIR601_VOFFSET) * cos_alpha * RVCOEF * beta * gamma);
- gvtab [i] = NEAREST_INT((i-CCIR601_VOFFSET) * GVCOEF * beta * gamma);
- bvtab [i] = NEAREST_INT((i-CCIR601_VOFFSET) * xi_sin_alpha * BUCOEF * beta * gamma);
- rutab [i] = NEAREST_INT((i-CCIR601_UOFFSET) * minus_zeta_sin_alpha * RVCOEF * beta * gamma);
- gutab [i] = NEAREST_INT((i-CCIR601_UOFFSET) * GUCOEF * beta * gamma);
- butab [i] = NEAREST_INT((i-CCIR601_UOFFSET) * cos_alpha * BUCOEF * beta * gamma);
- /* Y'Cr'Cb'->Y'Cr'Cb' conversion tables: */
- y = lambda + (i - CCIR601_YOFFSET) * kappa;
- _yytab [i] = _CLIP(8,CCIR601_YOFFSET + NEAREST_INT(y * gamma));
- _vvtab [i] = CCIR601_VOFFSET + NEAREST_INT((i-CCIR601_VOFFSET) * cos_alpha * beta * gamma);
- _uutab [i] = CCIR601_UOFFSET + NEAREST_INT((i-CCIR601_UOFFSET) * cos_alpha * beta * gamma);
- _vutab [i] = NEAREST_INT((i-CCIR601_UOFFSET) * minus_zeta_sin_alpha * beta * gamma);
- _uvtab [i] = NEAREST_INT((i-CCIR601_VOFFSET) * xi_sin_alpha * beta * gamma);
- if (!is_alpha) {
- _vvtab [i] = _CLIP(8,_vvtab [i]);
- _uutab [i] = _CLIP(8,_uutab [i]);
- }
- }
- }
- }
- void SetDestI420Colors (float brightness, float contrast, float saturation, float hue)
- {
- /* currently, we do not support color adjustments when destination
- * format is I420 (YCrCb 4:1:1), and conversion is always CCIR 601-2 -
- * compliant (regardless of values of papameters). */
- register int i, j;
- /* initialize y*tab[] tables: */
- for (i = 0; i <= RGB_MAX; i++) {
- yrtab [i] = NEAREST_INT((double)i * CCIR601_YRCOEF);
- ygtab [i] = NEAREST_INT((double)i * CCIR601_YGCOEF);
- ybtab [i] = NEAREST_INT((double)i * CCIR601_YBCOEF);
- }
- /* initialize yytab[]: */
- for (i = 0; i <= YMAX; i++) {
- j = NEAREST_INT((double)i * YSCALE);
- if (j > CCIR601_YMAX) j = CCIR601_YMAX;
- yytab [i] = j + CCIR601_YOFFSET;
- }
- /* initialize vrytab[]: */
- for (i = -VMIN; i <= VMAX; i++) {
- j = NEAREST_INT((double)i * VSCALE);
- if (j < -CCIR601_VMAX/2) j = -CCIR601_VMAX/2;
- if (j > CCIR601_VMAX/2) j = CCIR601_VMAX/2;
- vrytab [VMIN+i] = j + CCIR601_VOFFSET;
- }
- /* initialize ubytab[]: */
- for (i = -UMIN; i <= UMAX; i++) {
- j = NEAREST_INT((double)i * USCALE);
- if (j < -CCIR601_UMAX/2) j = -CCIR601_UMAX/2;
- if (j > CCIR601_UMAX/2) j = CCIR601_UMAX/2;
- ubytab [UMIN+i] = j + CCIR601_UOFFSET;
- }
- }
- /*
- * Sets RGB->I420 chroma resampling mode
- * Use:
- * int SetI420ChromaResamplingMode(int nNewMode);
- * Input:
- * nNewMode - a new chroma resampling mode to use
- * Returns:
- * previously set mode.
- */
- int SetI420ChromaResamplingMode(int new_mode)
- {
- register int m = chroma_resampling_mode;
- chroma_resampling_mode = new_mode;
- return m;
- }
- /* yuvctrl.c -- end of file */