Campbell Barton
afdd54fa37
* colour -> color * centre -> center * normalise -> normalize * modelling -> modeling
289 lines
7.1 KiB
C
289 lines
7.1 KiB
C
/*
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* pixelblending.c
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*
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* Functions to blend pixels with or without alpha, in various formats
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* nzc - June 2000
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*
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* Contributor(s): Full recode, 2004-2006 Blender Foundation
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#include <math.h>
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/* global includes */
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#include "BLI_arithb.h"
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#include "BLI_rand.h"
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/* own includes */
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#include "render_types.h"
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#include "renderpipeline.h"
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#include "pixelblending.h"
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#include "gammaCorrectionTables.h"
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/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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/* defined in pipeline.c, is hardcopy of active dynamic allocated Render */
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/* only to be used here in this file, it's for speed */
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extern struct Render R;
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/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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/* ------------------------------------------------------------------------- */
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/* Debug/behaviour defines */
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/* if defined: alpha blending with floats clips color, as with shorts */
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/* #define RE_FLOAT_COLOR_CLIPPING */
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/* if defined: alpha values are clipped */
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/* For now, we just keep alpha clipping. We run into thresholding and */
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/* blending difficulties otherwise. Be careful here. */
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#define RE_ALPHA_CLIPPING
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/* Threshold for a 'full' pixel: pixels with alpha above this level are */
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/* considered opaque This is the decimal value for 0xFFF0 / 0xFFFF */
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#define RE_FULL_COLOR_FLOAT 0.9998
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/* Threshold for an 'empty' pixel: pixels with alpha above this level are */
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/* considered completely transparent. This is the decimal value */
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/* for 0x000F / 0xFFFF */
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#define RE_EMPTY_COLOR_FLOAT 0.0002
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/* ------------------------------------------------------------------------- */
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void addAlphaOverFloat(float *dest, float *source)
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{
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/* d = s + (1-alpha_s)d*/
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float mul;
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mul= 1.0 - source[3];
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dest[0]= (mul*dest[0]) + source[0];
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dest[1]= (mul*dest[1]) + source[1];
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dest[2]= (mul*dest[2]) + source[2];
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dest[3]= (mul*dest[3]) + source[3];
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}
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/* ------------------------------------------------------------------------- */
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void addAlphaUnderFloat(float *dest, float *source)
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{
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float mul;
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if( (-RE_EMPTY_COLOR_FLOAT < dest[3])
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&& (dest[3] < RE_EMPTY_COLOR_FLOAT) ) {
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dest[0] = source[0];
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dest[1] = source[1];
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dest[2] = source[2];
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dest[3] = source[3];
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return;
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}
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mul= 1.0 - dest[3];
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dest[0]+= (mul*source[0]);
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dest[1]+= (mul*source[1]);
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dest[2]+= (mul*source[2]);
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dest[3]+= (mul*source[3]);
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}
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/* ------------------------------------------------------------------------- */
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void addalphaAddfacFloat(float *dest, float *source, char addfac)
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{
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float m; /* weiging factor of destination */
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float c; /* intermediate color */
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/* Addfac is a number between 0 and 1: rescale */
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/* final target is to diminish the influence of dest when addfac rises */
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m = 1.0 - ( source[3] * ((255.0 - addfac) / 255.0));
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/* blend colors*/
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c= (m * dest[0]) + source[0];
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#ifdef RE_FLOAT_COLOR_CLIPPING
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if(c >= RE_FULL_COLOR_FLOAT) dest[0] = RE_FULL_COLOR_FLOAT;
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else
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#endif
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dest[0]= c;
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c= (m * dest[1]) + source[1];
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#ifdef RE_FLOAT_COLOR_CLIPPING
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if(c >= RE_FULL_COLOR_FLOAT) dest[1] = RE_FULL_COLOR_FLOAT;
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else
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#endif
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dest[1]= c;
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c= (m * dest[2]) + source[2];
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#ifdef RE_FLOAT_COLOR_CLIPPING
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if(c >= RE_FULL_COLOR_FLOAT) dest[2] = RE_FULL_COLOR_FLOAT;
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else
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#endif
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dest[2]= c;
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c= (m * dest[3]) + source[3];
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#ifdef RE_ALPHA_CLIPPING
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if(c >= RE_FULL_COLOR_FLOAT) dest[3] = RE_FULL_COLOR_FLOAT;
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else
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#endif
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dest[3]= c;
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}
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/* ------------------------------------------------------------------------- */
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/* filtered adding to scanlines */
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void add_filt_fmask(unsigned int mask, float *col, float *rowbuf, int row_w)
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{
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/* calc the value of mask */
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float **fmask1= R.samples->fmask1, **fmask2=R.samples->fmask2;
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float *rb1, *rb2, *rb3;
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float val, r, g, b, al;
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unsigned int a, maskand, maskshift;
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int j;
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r= col[0];
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g= col[1];
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b= col[2];
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al= col[3];
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rb2= rowbuf-4;
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rb3= rb2-4*row_w;
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rb1= rb2+4*row_w;
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maskand= (mask & 255);
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maskshift= (mask >>8);
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for(j=2; j>=0; j--) {
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a= j;
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val= *(fmask1[a] +maskand) + *(fmask2[a] +maskshift);
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if(val!=0.0) {
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rb1[0]+= val*r;
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rb1[1]+= val*g;
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rb1[2]+= val*b;
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rb1[3]+= val*al;
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}
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a+=3;
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val= *(fmask1[a] +maskand) + *(fmask2[a] +maskshift);
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if(val!=0.0) {
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rb2[0]+= val*r;
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rb2[1]+= val*g;
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rb2[2]+= val*b;
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rb2[3]+= val*al;
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}
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a+=3;
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val= *(fmask1[a] +maskand) + *(fmask2[a] +maskshift);
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if(val!=0.0) {
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rb3[0]+= val*r;
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rb3[1]+= val*g;
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rb3[2]+= val*b;
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rb3[3]+= val*al;
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}
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rb1+= 4;
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rb2+= 4;
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rb3+= 4;
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}
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}
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void add_filt_fmask_pixsize(unsigned int mask, float *in, float *rowbuf, int row_w, int pixsize)
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{
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/* calc the value of mask */
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float **fmask1= R.samples->fmask1, **fmask2=R.samples->fmask2;
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float *rb1, *rb2, *rb3;
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float val;
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unsigned int a, maskand, maskshift;
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int i, j;
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rb2= rowbuf-pixsize;
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rb3= rb2-pixsize*row_w;
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rb1= rb2+pixsize*row_w;
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maskand= (mask & 255);
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maskshift= (mask >>8);
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for(j=2; j>=0; j--) {
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a= j;
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val= *(fmask1[a] +maskand) + *(fmask2[a] +maskshift);
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if(val!=0.0) {
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for(i= 0; i<pixsize; i++)
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rb1[i]+= val*in[i];
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}
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a+=3;
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val= *(fmask1[a] +maskand) + *(fmask2[a] +maskshift);
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if(val!=0.0) {
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for(i= 0; i<pixsize; i++)
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rb2[i]+= val*in[i];
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}
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a+=3;
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val= *(fmask1[a] +maskand) + *(fmask2[a] +maskshift);
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if(val!=0.0) {
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for(i= 0; i<pixsize; i++)
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rb3[i]+= val*in[i];
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}
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rb1+= pixsize;
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rb2+= pixsize;
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rb3+= pixsize;
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}
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}
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/* ------------------------------------------------------------------------- */
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void addalphaAddFloat(float *dest, float *source)
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{
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/* Makes me wonder whether this is required... */
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if( dest[3] < RE_EMPTY_COLOR_FLOAT) {
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dest[0] = source[0];
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dest[1] = source[1];
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dest[2] = source[2];
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dest[3] = source[3];
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return;
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}
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/* no clipping! */
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dest[0] = dest[0]+source[0];
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dest[1] = dest[1]+source[1];
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dest[2] = dest[2]+source[2];
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dest[3] = dest[3]+source[3];
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}
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/* ---------------------------------------------------------------------------- */
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/* eof pixelblending.c */
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