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8bf1615ce3aa44e9f68b1c8483edeabaa290307a
blender-archive/source/blender/imbuf/intern/divers.c
Peter Schlaile 8bf1615ce3 == Sequencer == 
Bugfix: [#28159] sequencer strip crop values on proxy not scene render size

Also: IMB saturation change moved into imbuf-module.
2012-03-17 19:31:28 +00:00

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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
* allocimbuf.c
*
*/
/** \file blender/imbuf/intern/divers.c
* \ingroup imbuf
*/
#include "BLI_blenlib.h"
#include "BLI_rand.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "imbuf.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_allocimbuf.h"
#include "MEM_guardedalloc.h"
/**************************** Interlace/Deinterlace **************************/
void IMB_de_interlace(ImBuf *ibuf)
{
ImBuf * tbuf1, * tbuf2;
if (ibuf == NULL) return;
if (ibuf->flags & IB_fields) return;
ibuf->flags |= IB_fields;
if (ibuf->rect) {
/* make copies */
tbuf1 = IMB_allocImBuf(ibuf->x, ibuf->y / 2, 32, IB_rect);
tbuf2 = IMB_allocImBuf(ibuf->x, ibuf->y / 2, 32, IB_rect);
ibuf->x *= 2;
IMB_rectcpy(tbuf1, ibuf, 0, 0, 0, 0, ibuf->x, ibuf->y);
IMB_rectcpy(tbuf2, ibuf, 0, 0, tbuf2->x, 0, ibuf->x, ibuf->y);
ibuf->x /= 2;
IMB_rectcpy(ibuf, tbuf1, 0, 0, 0, 0, tbuf1->x, tbuf1->y);
IMB_rectcpy(ibuf, tbuf2, 0, tbuf2->y, 0, 0, tbuf2->x, tbuf2->y);
IMB_freeImBuf(tbuf1);
IMB_freeImBuf(tbuf2);
}
ibuf->y /= 2;
}
void IMB_interlace(ImBuf *ibuf)
{
ImBuf * tbuf1, * tbuf2;
if (ibuf == NULL) return;
ibuf->flags &= ~IB_fields;
ibuf->y *= 2;
if (ibuf->rect) {
/* make copies */
tbuf1 = IMB_allocImBuf(ibuf->x, ibuf->y / 2, 32, IB_rect);
tbuf2 = IMB_allocImBuf(ibuf->x, ibuf->y / 2, 32, IB_rect);
IMB_rectcpy(tbuf1, ibuf, 0, 0, 0, 0, ibuf->x, ibuf->y);
IMB_rectcpy(tbuf2, ibuf, 0, 0, 0, tbuf2->y, ibuf->x, ibuf->y);
ibuf->x *= 2;
IMB_rectcpy(ibuf, tbuf1, 0, 0, 0, 0, tbuf1->x, tbuf1->y);
IMB_rectcpy(ibuf, tbuf2, tbuf2->x, 0, 0, 0, tbuf2->x, tbuf2->y);
ibuf->x /= 2;
IMB_freeImBuf(tbuf1);
IMB_freeImBuf(tbuf2);
}
}
/************************* Floyd-Steinberg dithering *************************/
typedef struct DitherContext {
int *error_buf, *e;
int v[4], v0[4], v1[4];
float f;
} DitherContext;
DitherContext *create_dither_context(int w, float factor)
{
DitherContext *di;
int i;
di= MEM_callocN(sizeof(DitherContext), "dithering context");
di->f= factor / 16.0f;
di->error_buf= MEM_callocN(4*(w+1)*sizeof(int), "dithering error");
di->e= di->error_buf;
for(i=0; i<4; ++i)
di->v[i]= di->v0[i]= di->v1[i]= 1024.0f*(BLI_frand()-0.5f);
return di;
}
static void clear_dither_context(DitherContext *di)
{
MEM_freeN(di->error_buf);
MEM_freeN(di);
}
static void dither_finish_row(DitherContext *di)
{
int i;
for(i=0; i<4; i++)
di->v[i]= di->v0[i]= di->v1[i] = 0;
di->e= di->error_buf;
}
MINLINE unsigned char dither_value(unsigned short v_in, DitherContext *di, int i)
{
int dv, d2;
unsigned char v_out;
di->v[i] = v_in + (2*di->v[i] + di->e[4]) * di->f;
CLAMP(di->v[i], 0, 0xFF00);
v_out = USHORTTOUCHAR(di->v[i]);
di->v[i] -= v_out<<8;
dv = di->v[i];
d2 = di->v[i]<<1;
di->v[i] += d2;
*(di->e++) = di->v[i] + di->v0[i];
di->v[i] += d2;
di->v0[i] = di->v[i] + di->v1[i];
di->v1[i] = dv;
di->v[i] += d2;
return v_out;
}
/************************* Generic Buffer Conversion *************************/
MINLINE void ushort_to_byte_v4(uchar b[4], const unsigned short us[4])
{
b[0]= USHORTTOUCHAR(us[0]);
b[1]= USHORTTOUCHAR(us[1]);
b[2]= USHORTTOUCHAR(us[2]);
b[3]= USHORTTOUCHAR(us[3]);
}
MINLINE void ushort_to_byte_dither_v4(uchar b[4], const unsigned short us[4], DitherContext *di)
{
b[0]= dither_value(us[0], di, 0);
b[1]= dither_value(us[1], di, 1);
b[2]= dither_value(us[2], di, 2);
b[3]= dither_value(us[3], di, 3);
}
MINLINE void float_to_byte_dither_v4(uchar b[4], const float f[4], DitherContext *di)
{
unsigned short us[4] = {FTOUSHORT(f[0]), FTOUSHORT(f[1]), FTOUSHORT(f[2]), FTOUSHORT(f[3])};
ushort_to_byte_dither_v4(b, us, di);
}
/* float to byte pixels, output 4-channel RGBA */
void IMB_buffer_byte_from_float(uchar *rect_to, const float *rect_from,
int channels_from, float dither, int profile_to, int profile_from, int predivide,
int width, int height, int stride_to, int stride_from)
{
float tmp[4];
int x, y;
DitherContext *di;
/* we need valid profiles */
BLI_assert(profile_to != IB_PROFILE_NONE);
BLI_assert(profile_from != IB_PROFILE_NONE);
BLI_init_srgb_conversion();
if(dither)
di= create_dither_context(width, dither);
for(y = 0; y < height; y++) {
if(channels_from == 1) {
/* single channel input */
const float *from = rect_from + stride_from*y;
uchar *to = rect_to + stride_to*y*4;
for(x = 0; x < width; x++, from++, to+=4)
to[0] = to[1] = to[2] = to[3] = FTOCHAR(from[0]);
}
else if(channels_from == 3) {
/* RGB input */
const float *from = rect_from + stride_from*y*3;
uchar *to = rect_to + stride_to*y*4;
if(profile_to == profile_from) {
/* no color space conversion */
for(x = 0; x < width; x++, from+=3, to+=4) {
rgb_float_to_uchar(to, from);
to[3] = 255;
}
}
else if(profile_to == IB_PROFILE_SRGB) {
/* convert from linear to sRGB */
for(x = 0; x < width; x++, from+=3, to+=4) {
linearrgb_to_srgb_v3_v3(tmp, from);
rgb_float_to_uchar(to, tmp);
to[3] = 255;
}
}
else if(profile_to == IB_PROFILE_LINEAR_RGB) {
/* convert from sRGB to linear */
for(x = 0; x < width; x++, from+=3, to+=4) {
srgb_to_linearrgb_v3_v3(tmp, from);
rgb_float_to_uchar(to, tmp);
to[3] = 255;
}
}
}
else if(channels_from == 4) {
/* RGBA input */
const float *from = rect_from + stride_from*y*4;
uchar *to = rect_to + stride_to*y*4;
if(profile_to == profile_from) {
/* no color space conversion */
if(dither) {
for(x = 0; x < width; x++, from+=4, to+=4)
float_to_byte_dither_v4(to, from, di);
}
else {
for(x = 0; x < width; x++, from+=4, to+=4)
rgba_float_to_uchar(to, from);
}
}
else if(profile_to == IB_PROFILE_SRGB) {
/* convert from linear to sRGB */
unsigned short us[4];
if(dither && predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
linearrgb_to_srgb_ushort4_predivide(us, from);
ushort_to_byte_dither_v4(to, us, di);
}
}
else if(dither) {
for(x = 0; x < width; x++, from+=4, to+=4) {
linearrgb_to_srgb_ushort4(us, from);
ushort_to_byte_dither_v4(to, us, di);
}
}
else if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
linearrgb_to_srgb_ushort4_predivide(us, from);
ushort_to_byte_v4(to, us);
}
}
else {
for(x = 0; x < width; x++, from+=4, to+=4) {
linearrgb_to_srgb_ushort4(us, from);
ushort_to_byte_v4(to, us);
}
}
}
else if(profile_to == IB_PROFILE_LINEAR_RGB) {
/* convert from sRGB to linear */
if(dither && predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
srgb_to_linearrgb_predivide_v4(tmp, from);
float_to_byte_dither_v4(to, tmp, di);
}
}
else if(dither) {
for(x = 0; x < width; x++, from+=4, to+=4) {
srgb_to_linearrgb_v4(tmp, from);
float_to_byte_dither_v4(to, tmp, di);
}
}
else if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
srgb_to_linearrgb_predivide_v4(tmp, from);
rgba_float_to_uchar(to, tmp);
}
}
else {
for(x = 0; x < width; x++, from+=4, to+=4) {
srgb_to_linearrgb_v4(tmp, from);
rgba_float_to_uchar(to, tmp);
}
}
}
}
if(dither)
dither_finish_row(di);
}
if(dither)
clear_dither_context(di);
}
/* byte to float pixels, input and output 4-channel RGBA */
void IMB_buffer_float_from_byte(float *rect_to, const uchar *rect_from,
int profile_to, int profile_from, int predivide,
int width, int height, int stride_to, int stride_from)
{
float tmp[4];
int x, y;
/* we need valid profiles */
BLI_assert(profile_to != IB_PROFILE_NONE);
BLI_assert(profile_from != IB_PROFILE_NONE);
BLI_init_srgb_conversion();
/* RGBA input */
for(y = 0; y < height; y++) {
const uchar *from = rect_from + stride_from*y*4;
float *to = rect_to + stride_to*y*4;
if(profile_to == profile_from) {
/* no color space conversion */
for(x = 0; x < width; x++, from+=4, to+=4)
rgba_uchar_to_float(to, from);
}
else if(profile_to == IB_PROFILE_LINEAR_RGB) {
/* convert sRGB to linear */
if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
srgb_to_linearrgb_uchar4_predivide(to, from);
}
}
else {
for(x = 0; x < width; x++, from+=4, to+=4) {
srgb_to_linearrgb_uchar4(to, from);
}
}
}
else if(profile_to == IB_PROFILE_SRGB) {
/* convert linear to sRGB */
if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
rgba_uchar_to_float(tmp, from);
linearrgb_to_srgb_predivide_v4(to, tmp);
}
}
else {
for(x = 0; x < width; x++, from+=4, to+=4) {
rgba_uchar_to_float(tmp, from);
linearrgb_to_srgb_v4(to, tmp);
}
}
}
}
}
/* float to float pixels, output 4-channel RGBA */
void IMB_buffer_float_from_float(float *rect_to, const float *rect_from,
int channels_from, int profile_to, int profile_from, int predivide,
int width, int height, int stride_to, int stride_from)
{
int x, y;
/* we need valid profiles */
BLI_assert(profile_to != IB_PROFILE_NONE);
BLI_assert(profile_from != IB_PROFILE_NONE);
if(channels_from==1) {
/* single channel input */
for(y = 0; y < height; y++) {
const float *from = rect_from + stride_from*y;
float *to = rect_to + stride_to*y*4;
for(x = 0; x < width; x++, from++, to+=4)
to[0] = to[1] = to[2] = to[3] = from[0];
}
}
else if(channels_from == 3) {
/* RGB input */
for(y = 0; y < height; y++) {
const float *from = rect_from + stride_from*y*3;
float *to = rect_to + stride_to*y*4;
if(profile_to == profile_from) {
/* no color space conversion */
for(x = 0; x < width; x++, from+=3, to+=4) {
copy_v3_v3(to, from);
to[3] = 1.0f;
}
}
else if(profile_to == IB_PROFILE_LINEAR_RGB) {
/* convert from sRGB to linear */
for(x = 0; x < width; x++, from+=3, to+=4) {
srgb_to_linearrgb_v3_v3(to, from);
to[3] = 1.0f;
}
}
else if(profile_to == IB_PROFILE_SRGB) {
/* convert from linear to sRGB */
for(x = 0; x < width; x++, from+=3, to+=4) {
linearrgb_to_srgb_v3_v3(to, from);
to[3] = 1.0f;
}
}
}
}
else if(channels_from == 4) {
/* RGBA input */
for(y = 0; y < height; y++) {
const float *from = rect_from + stride_from*y*4;
float *to = rect_to + stride_to*y*4;
if(profile_to == profile_from) {
/* same profile, copy */
memcpy(to, from, sizeof(float)*4*width);
}
else if(profile_to == IB_PROFILE_LINEAR_RGB) {
/* convert to sRGB to linear */
if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4)
srgb_to_linearrgb_predivide_v4(to, from);
}
else {
for(x = 0; x < width; x++, from+=4, to+=4)
srgb_to_linearrgb_v4(to, from);
}
}
else if(profile_to == IB_PROFILE_SRGB) {
/* convert from linear to sRGB */
if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4)
linearrgb_to_srgb_predivide_v4(to, from);
}
else {
for(x = 0; x < width; x++, from+=4, to+=4)
linearrgb_to_srgb_v4(to, from);
}
}
}
}
}
/* byte to byte pixels, input and output 4-channel RGBA */
void IMB_buffer_byte_from_byte(uchar *rect_to, const uchar *rect_from,
int profile_to, int profile_from, int predivide,
int width, int height, int stride_to, int stride_from)
{
float tmp[4];
int x, y;
/* we need valid profiles */
BLI_assert(profile_to != IB_PROFILE_NONE);
BLI_assert(profile_from != IB_PROFILE_NONE);
/* always RGBA input */
for(y = 0; y < height; y++) {
const uchar *from = rect_from + stride_from*y*4;
uchar *to = rect_to + stride_to*y*4;
if(profile_to == profile_from) {
/* same profile, copy */
memcpy(to, from, sizeof(uchar)*4*width);
}
else if(profile_to == IB_PROFILE_LINEAR_RGB) {
/* convert to sRGB to linear */
if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
rgba_uchar_to_float(tmp, from);
srgb_to_linearrgb_predivide_v4(tmp, tmp);
rgba_float_to_uchar(to, tmp);
}
}
else {
for(x = 0; x < width; x++, from+=4, to+=4) {
rgba_uchar_to_float(tmp, from);
srgb_to_linearrgb_v4(tmp, tmp);
rgba_float_to_uchar(to, tmp);
}
}
}
else if(profile_to == IB_PROFILE_SRGB) {
/* convert from linear to sRGB */
if(predivide) {
for(x = 0; x < width; x++, from+=4, to+=4) {
rgba_uchar_to_float(tmp, from);
linearrgb_to_srgb_predivide_v4(tmp, tmp);
rgba_float_to_uchar(to, tmp);
}
}
else {
for(x = 0; x < width; x++, from+=4, to+=4) {
rgba_uchar_to_float(tmp, from);
linearrgb_to_srgb_v4(tmp, tmp);
rgba_float_to_uchar(to, tmp);
}
}
}
}
}
/****************************** ImBuf Conversion *****************************/
void IMB_rect_from_float(ImBuf *ibuf)
{
int predivide= (ibuf->flags & IB_cm_predivide);
int profile_from;
/* verify we have a float buffer */
if(ibuf->rect_float==NULL)
return;
/* create byte rect if it didn't exist yet */
if(ibuf->rect==NULL)
imb_addrectImBuf(ibuf);
/* determine profiles */
if(ibuf->profile == IB_PROFILE_LINEAR_RGB)
profile_from = IB_PROFILE_LINEAR_RGB;
else if(ELEM(ibuf->profile, IB_PROFILE_SRGB, IB_PROFILE_NONE))
profile_from = IB_PROFILE_SRGB;
else
BLI_assert(0);
/* do conversion */
IMB_buffer_byte_from_float((uchar*)ibuf->rect, ibuf->rect_float,
ibuf->channels, ibuf->dither, IB_PROFILE_SRGB, profile_from, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
/* ensure user flag is reset */
ibuf->userflags &= ~IB_RECT_INVALID;
}
/* converts from linear float to sRGB byte for part of the texture, buffer will hold the changed part */
void IMB_partial_rect_from_float(ImBuf *ibuf, float *buffer, int x, int y, int w, int h)
{
float *rect_float;
uchar *rect_byte;
int predivide= (ibuf->flags & IB_cm_predivide);
int profile_from;
/* verify we have a float buffer */
if(ibuf->rect_float==NULL || buffer==NULL)
return;
/* create byte rect if it didn't exist yet */
if(ibuf->rect==NULL)
imb_addrectImBuf(ibuf);
/* determine profiles */
if(ibuf->profile == IB_PROFILE_LINEAR_RGB)
profile_from = IB_PROFILE_LINEAR_RGB;
else if(ELEM(ibuf->profile, IB_PROFILE_SRGB, IB_PROFILE_NONE))
profile_from = IB_PROFILE_SRGB;
else
BLI_assert(0);
/* do conversion */
rect_float= ibuf->rect_float + (x + y*ibuf->x)*ibuf->channels;
rect_byte= (uchar*)ibuf->rect + (x + y*ibuf->x)*4;
IMB_buffer_float_from_float(buffer, rect_float,
ibuf->channels, IB_PROFILE_SRGB, profile_from, predivide,
w, h, w, ibuf->x);
IMB_buffer_byte_from_float(rect_byte, buffer,
4, ibuf->dither, IB_PROFILE_SRGB, IB_PROFILE_SRGB, 0,
w, h, ibuf->x, w);
/* ensure user flag is reset */
ibuf->userflags &= ~IB_RECT_INVALID;
}
void IMB_float_from_rect(ImBuf *ibuf)
{
int predivide= (ibuf->flags & IB_cm_predivide);
int profile_from;
/* verify if we byte and float buffers */
if(ibuf->rect==NULL)
return;
if(ibuf->rect_float==NULL)
if(imb_addrectfloatImBuf(ibuf) == 0)
return;
/* determine profiles */
if(ibuf->profile == IB_PROFILE_NONE)
profile_from = IB_PROFILE_LINEAR_RGB;
else
profile_from = IB_PROFILE_SRGB;
/* do conversion */
IMB_buffer_float_from_byte(ibuf->rect_float, (uchar*)ibuf->rect,
IB_PROFILE_LINEAR_RGB, profile_from, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
}
/* no profile conversion */
void IMB_float_from_rect_simple(ImBuf *ibuf)
{
int predivide= (ibuf->flags & IB_cm_predivide);
if(ibuf->rect_float==NULL)
imb_addrectfloatImBuf(ibuf);
IMB_buffer_float_from_byte(ibuf->rect_float, (uchar*)ibuf->rect,
IB_PROFILE_SRGB, IB_PROFILE_SRGB, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
}
void IMB_convert_profile(ImBuf *ibuf, int profile)
{
int predivide= (ibuf->flags & IB_cm_predivide);
int profile_from, profile_to;
if(ibuf->profile == profile)
return;
/* determine profiles */
if(ibuf->profile == IB_PROFILE_LINEAR_RGB)
profile_from = IB_PROFILE_LINEAR_RGB;
else if(ELEM(ibuf->profile, IB_PROFILE_SRGB, IB_PROFILE_NONE))
profile_from = IB_PROFILE_SRGB;
else {
BLI_assert(0);
profile_from = IB_PROFILE_SRGB; /* dummy, should never happen */
}
if(profile == IB_PROFILE_LINEAR_RGB)
profile_to = IB_PROFILE_LINEAR_RGB;
else if(ELEM(profile, IB_PROFILE_SRGB, IB_PROFILE_NONE))
profile_to = IB_PROFILE_SRGB;
else {
BLI_assert(0);
profile_to = IB_PROFILE_SRGB; /* dummy, should never happen */
}
/* do conversion */
if(ibuf->rect_float) {
IMB_buffer_float_from_float(ibuf->rect_float, ibuf->rect_float,
4, profile_to, profile_from, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
}
if(ibuf->rect) {
IMB_buffer_byte_from_byte((uchar*)ibuf->rect, (uchar*)ibuf->rect,
profile_to, profile_from, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
}
/* set new profile */
ibuf->profile= profile;
}
/* use when you need to get a buffer with a certain profile
* if the return */
float *IMB_float_profile_ensure(ImBuf *ibuf, int profile, int *alloc)
{
int predivide= (ibuf->flags & IB_cm_predivide);
int profile_from, profile_to;
/* determine profiles */
if(ibuf->profile == IB_PROFILE_NONE)
profile_from = IB_PROFILE_LINEAR_RGB;
else
profile_from = IB_PROFILE_SRGB;
if(profile == IB_PROFILE_NONE)
profile_to = IB_PROFILE_LINEAR_RGB;
else
profile_to = IB_PROFILE_SRGB;
if(profile_from == profile_to) {
/* simple case, just allocate the buffer and return */
*alloc= 0;
if(ibuf->rect_float == NULL)
IMB_float_from_rect(ibuf);
return ibuf->rect_float;
}
else {
/* conversion is needed, first check */
float *fbuf= MEM_mallocN(ibuf->x * ibuf->y * sizeof(float) * 4, "IMB_float_profile_ensure");
*alloc= 1;
if(ibuf->rect_float == NULL) {
IMB_buffer_float_from_byte(fbuf, (uchar*)ibuf->rect,
profile_to, profile_from, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
}
else {
IMB_buffer_float_from_float(fbuf, ibuf->rect_float,
4, profile_to, profile_from, predivide,
ibuf->x, ibuf->y, ibuf->x, ibuf->x);
}
return fbuf;
}
}
/**************************** Color to Grayscale *****************************/
/* no profile conversion */
void IMB_color_to_bw(ImBuf *ibuf)
{
float *rctf= ibuf->rect_float;
uchar *rct= (uchar*)ibuf->rect;
int i;
if(rctf) {
for(i = ibuf->x * ibuf->y; i > 0; i--, rctf+=4)
rctf[0]= rctf[1]= rctf[2]= rgb_to_grayscale(rctf);
}
if(rct) {
for(i = ibuf->x * ibuf->y; i > 0; i--, rct+=4)
rct[0]= rct[1]= rct[2]= rgb_to_grayscale_byte(rct);
}
}
void IMB_buffer_float_clamp(float *buf, int width, int height)
{
int i, total = width*height*4;
for(i = 0; i < total; i++){
buf[i] = MIN2(1.0, buf[i]);
}
}
/**************************** alter saturation *****************************/
void IMB_saturation(ImBuf * ibuf, float sat)
{
int i;
unsigned char *rct= (unsigned char *)ibuf->rect;
float *rctf= ibuf->rect_float;
float hsv[3];
if(rct) {
float rgb[3];
for (i = ibuf->x * ibuf->y; i > 0; i--, rct+=4) {
rgb_uchar_to_float(rgb, rct);
rgb_to_hsv(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);
hsv_to_rgb(hsv[0], hsv[1] * sat, hsv[2], rgb, rgb+1, rgb+2);
rgb_float_to_uchar(rct, rgb);
}
}
if(rctf) {
for (i = ibuf->x * ibuf->y; i > 0; i--, rctf+=4) {
rgb_to_hsv(rctf[0], rctf[1], rctf[2], hsv, hsv+1, hsv+2);
hsv_to_rgb(hsv[0], hsv[1] * sat, hsv[2], rctf, rctf+1, rctf+2);
}
}
}
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