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This is patch [#6929] Interpolation Methods

Browse Source 
http://projects.blender.org/tracker/index.php?func=detail&aid=6929&group_id=9&atid=127
Its a subset of patch [#6766] Transform Sequencer effect

It adds 3 image functions for different types of interpolation.
For people that like pictures:
http://wiki.blender.org/index.php/User:Damiles#Interpolations_Algorithms

Patch provided by David Millán Escrivá (damiles)

Kent
This commit is contained in:
Kent Mein 2007-07-10 19:13:03 +00:00
parent 209407a7e1
commit 9298357670
2 changed files with 234 additions and 1 deletions
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8
source/blender/imbuf/IMB_imbuf.h
View File

@ -395,7 +395,13 @@ void IMB_float_from_rect(struct ImBuf *ibuf);
* @attention Defined in imageprocess.c
*/
void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf);
/**
*
* @attention defined in imageprocess.c
*/
void bicubic_interpolation(struct ImBuf *in, struct ImBuf *out, float x, float y, int xout, int yout);
void neareast_interpolation(struct ImBuf *in, struct ImBuf *out, float u, float v, int xout, int yout);
void bilinear_interpolation(struct ImBuf *in, struct ImBuf *out, float u, float v, int xout, int yout);
/**
* Change the ordering of the color bytes pointed to by rect from
* rgba to abgr. size * 4 color bytes are reordered.

227
source/blender/imbuf/intern/imageprocess.c
View File

@ -42,6 +42,11 @@
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "math.h"
/* This define should be relocated to a global header some where Kent Mein
I stole it from util.h in the plugins api */
#define MAX2(x,y) ( (x)>(y) ? (x) : (y) )
/* Only this one is used liberally here, and in imbuf */
void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf)
@ -73,3 +78,225 @@ void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf)
}
}
/**************************************************************************
* INTERPOLATIONS
*
* Reference and docs:
* http://wiki.blender.org/index.php/User:Damiles#Interpolations_Algorithms
***************************************************************************/
/* BICUBIC */
/* Bicubic formula:
*
* A’(px,py) = Σn=-1..2Σm=-1..2 A(i+n,j+m)·P(n-a)·P(b-m)
* with: P(k) = 1/6(C(k+2)^3-4C(k+1)^3+6C(k)^3-4C(k-1)^3)
* and C(k) = max(0, k)
*
* Where A= in and A'=out
*
* More info: http://wiki.blender.org/index.php/User:Damiles#Bicubic_pixel_interpolation
*/
/* function assumes out to be zero'ed, only does RGBA */
static float P(float k){
float aux;
aux=(float)(1.0f/6.0f)*( pow( MAX2(k+2.0f,0) , 3.0f ) - 4.0f * pow( MAX2(k+1.0f,0) , 3.0f ) + 6.0f * pow( MAX2(k,0) , 3.0f ) - 4.0f * pow( MAX2(k-1.0f,0) , 3.0f));
return aux ;
}
void bicubic_interpolation(ImBuf *in, ImBuf *out, float x, float y, int xout, int yout)
{
int i,j,n,m,x1,y1;
unsigned char *dataI,*outI;
float a,b, outR,outG,outB,outA,*dataF,*outF;
int do_rect, do_float;
if (in == NULL) return;
if (in->rect == NULL && in->rect_float == NULL) return;
do_rect= (in->rect != NULL);
do_float= (in->rect_float != NULL);
i= (int)floor(x);
j= (int)floor(y);
a= x - i;
b= y - j;
outR= 0.0f;
outG= 0.0f;
outB= 0.0f;
outA= 0.0f;
for(n= -1; n<= 2; n++){
for(m= -1; m<= 2; m++){
x1= i+n;
y1= j+m;
if (x1>0 && x1 < in->x && y1>0 && y1<in->y) {
if (do_float) {
dataF= in->rect_float + in->x * y1 * 4 + 4*x1;
outR+= dataF[0] * P(n-a) * P(b-m);
outG+= dataF[1] * P(n-a) * P(b-m);
outB+= dataF[2] * P(n-a) * P(b-m);
outA+= dataF[3] * P(n-a) * P(b-m);
}
if (do_rect) {
dataI= (unsigned char*)in->rect + in->x * y1 * 4 + 4*x1;
outR+= dataI[0] * P(n-a) * P(b-m);
outG+= dataI[1] * P(n-a) * P(b-m);
outB+= dataI[2] * P(n-a) * P(b-m);
outA+= dataI[3] * P(n-a) * P(b-m);
}
}
}
}
if (do_rect) {
outI= (unsigned char *)out->rect + out->x * yout * 4 + 4*xout;
outI[0]= (int)outR;
outI[1]= (int)outG;
outI[2]= (int)outB;
outI[3]= (int)outA;
}
if (do_float) {
outF= (float *)out->rect_float + out->x * yout * 4 + 4*xout;
outF[0]= outR;
outF[1]= outG;
outF[2]= outB;
outF[3]= outA;
}
}
/* function assumes out to be zero'ed, only does RGBA */
/* BILINEAR INTERPOLATION */
void bilinear_interpolation(ImBuf *in, ImBuf *out, float u, float v, int xout, int yout)
{
float *row1, *row2, *row3, *row4, a, b, *outF;
unsigned char *row1I, *row2I, *row3I, *row4I, *outI;
float a_b, ma_b, a_mb, ma_mb;
float empty[4]= {0.0f, 0.0f, 0.0f, 0.0f};
unsigned char emptyI[4]= {0, 0, 0, 0};
int y1, y2, x1, x2;
int do_rect, do_float;
if (in==NULL) return;
if (in->rect==NULL && in->rect_float==NULL) return;
do_rect= (in->rect != NULL);
do_float= (in->rect_float != NULL);
x1= (int)floor(u);
x2= (int)ceil(u);
y1= (int)floor(v);
y2= (int)ceil(v);
// sample area entirely outside image?
if (x2<0 || x1>in->x-1 || y2<0 || y1>in->y-1) return;
if (do_rect)
outI=(unsigned char *)out->rect + out->x * yout * 4 + 4*xout;
if (do_float)
outF=(float *)out->rect_float + out->x * yout * 4 + 4*xout;
if (do_float) {
// sample including outside of edges of image
if (x1<0 || y1<0) row1= empty;
else row1= (float *)in->rect_float + in->x * y1 * 4 + 4*x1;
if (x1<0 || y2>in->y-1) row2= empty;
else row2= (float *)in->rect_float + in->x * y2 * 4 + 4*x1;
if (x2>in->x-1 || y1<0) row3= empty;
else row3= (float *)in->rect_float + in->x * y1 * 4 + 4*x2;
if (x2>in->x-1 || y2>in->y-1) row4= empty;
else row4= (float *)in->rect_float + in->x * y2 * 4 + 4*x2;
a= u-floor(u);
b= v-floor(v);
a_b= a*b; ma_b= (1.0f-a)*b; a_mb= a*(1.0f-b); ma_mb= (1.0f-a)*(1.0f-b);
outF[0]= ma_mb*row1[0] + a_mb*row3[0] + ma_b*row2[0]+ a_b*row4[0];
outF[1]= ma_mb*row1[1] + a_mb*row3[1] + ma_b*row2[1]+ a_b*row4[1];
outF[2]= ma_mb*row1[2] + a_mb*row3[2] + ma_b*row2[2]+ a_b*row4[2];
outF[3]= ma_mb*row1[3] + a_mb*row3[3] + ma_b*row2[3]+ a_b*row4[3];
}
if (do_rect) {
// sample including outside of edges of image
if (x1<0 || y1<0) row1I= emptyI;
else row1I= (unsigned char *)in->rect + in->x * y1 * 4 + 4*x1;
if (x1<0 || y2>in->y-1) row2I= emptyI;
else row2I= (unsigned char *)in->rect + in->x * y2 * 4 + 4*x1;
if (x2>in->x-1 || y1<0) row3I= emptyI;
else row3I= (unsigned char *)in->rect + in->x * y1 * 4 + 4*x2;
if (x2>in->x-1 || y2>in->y-1) row4I= emptyI;
else row4I= (unsigned char *)in->rect + in->x * y2 * 4 + 4*x2;
a= u-floor(u);
b= v-floor(v);
a_b= a*b; ma_b= (1.0f-a)*b; a_mb= a*(1.0f-b); ma_mb= (1.0f-a)*(1.0f-b);
outI[0]= ma_mb*row1I[0] + a_mb*row3I[0] + ma_b*row2I[0]+ a_b*row4I[0];
outI[1]= ma_mb*row1I[1] + a_mb*row3I[1] + ma_b*row2I[1]+ a_b*row4I[1];
outI[2]= ma_mb*row1I[2] + a_mb*row3I[2] + ma_b*row2I[2]+ a_b*row4I[2];
outI[3]= ma_mb*row1I[3] + a_mb*row3I[3] + ma_b*row2I[3]+ a_b*row4I[3];
}
}
/* function assumes out to be zero'ed, only does RGBA */
/* NEAREST INTERPOLATION */
void neareast_interpolation(ImBuf *in, ImBuf *out, float u, float v,int xout, int yout)
{
float *outF,*dataF;
unsigned char *dataI,*outI;
int y1, x1;
int do_rect, do_float;
if (in==NULL) return;
if (in->rect==NULL && in->rect_float==NULL) return;
do_rect= (in->rect != NULL);
do_float= (in->rect_float != NULL);
x1= (int)(u);
y1= (int)(v);
if (do_rect)
outI=(unsigned char *)out->rect + out->x * yout * 4 + 4*xout;
if (do_float)
outF=(float *)out->rect_float + out->x * yout * 4 + 4*xout;
// sample area entirely outside image?
if (x1<0 || x1>in->x-1 || y1<0 || y1>in->y-1) return;
// sample including outside of edges of image
if (x1<0 || y1<0) {
if (do_rect) {
outI[0]= 0;
outI[1]= 0;
outI[2]= 0;
outI[3]= 0;
}
if (do_float) {
outF[0]= 0.0f;
outF[1]= 0.0f;
outF[2]= 0.0f;
outF[3]= 0.0f;
}
} else {
dataI= (unsigned char *)in->rect + in->x * y1 * 4 + 4*x1;
if (do_rect) {
outI[0]= dataI[0];
outI[1]= dataI[1];
outI[2]= dataI[2];
outI[3]= dataI[3];
}
dataF= in->rect_float + in->x * y1 * 4 + 4*x1;
if (do_float) {
outF[0]= dataF[0];
outF[1]= dataF[1];
outF[2]= dataF[2];
outF[3]= dataF[3];
}
}
}