Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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/*
* Floating filters are all WIP !
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <float.h>
#include "../floatimg.h"
/* -------------------------------------------------------------------- */
int fimg_filter_3x3(FloatImg *src, FloatImg *dst, FimgFilter3x3 *filtr)
{
int x, y, w, h, of;
float *pr, *pg, *pb; /* alias for src pix filds */
float *M; /* alias of filter matrix */
double dval;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p %p )\n", __func__, src, dst, filtr);
#endif
if (src->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s: src type %d invalid\n", __func__, src->type);
return -99;
}
if (dst->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s: dst type %d invalid\n", __func__, dst->type);
return -99;
}
if (fimg_images_not_compatible(src, dst)) {
fprintf(stderr, "%s: src & dst not comatibles\n", __func__);
return -98;
}
/* aliasing some vars for cleaner code */
pr = src->R; pg = src->G; pb = src->B;
w = src->width; h = src->height;
M = filtr->matrix;
for (y=1; y < h-1; y++) {
for (x=1; x < w-1; x++) {
of = x + (y * w);
dval = M[0] * pr[of-(w+1)] +
M[1] * pr[of-w] +
M[2] * pr[of-(w-1)] +
M[3] * pr[of-1] +
M[4] * pr[of] +
M[5] * pr[of+1] +
M[6] * pr[of+(w+1)] +
M[7] * pr[of+w] +
M[8] * pr[of+(w-1)] ;
dst->R[of] = dval + filtr->offset;
dval = M[0] * pg[of-(w+1)] +
M[1] * pg[of-w] +
M[2] * pg[of-(w-1)] +
M[3] * pg[of-1] +
M[4] * pg[of] +
M[5] * pg[of+1] +
M[6] * pg[of+(w+1)] +
M[7] * pg[of+w] +
M[8] * pg[of+(w-1)] ;
dst->G[of] = dval + filtr->offset;
dval = M[0] * pb[of-(w+1)] +
M[1] * pb[of-w] +
M[2] * pb[of-(w-1)] +
M[3] * pb[of-1] +
M[4] * pb[of] +
M[5] * pb[of+1] +
M[6] * pb[of+(w+1)] +
M[7] * pb[of+w] +
M[8] * pb[of+(w-1)] ;
dst->B[of] = dval + filtr->offset;
}
}
return 0;
}
/* -------------------------------------------------------------------- */
/*
* this is the more shifting hack on the block.
*/
static int fimg_lissage_2x2_a(FloatImg *img)
{
int x, y, offset;
float cr, cg, cb;
float *pr, *pg, *pb;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p )\n", __func__, img);
fprintf(stderr," type %d size %dx%d\n", img->type,
img->width, img->height);
#endif
if (img->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s : type %d invalide\n", __func__, img->type);
return -99;
}
pr = img->R; pg = img->G; pb = img->B;
for (y=1; y < img->height-1; y++) {
for (x=1; x < img->width-1; x++) {
offset = x + (y * img->width);
cr = pr[offset] + pr[offset+1] +
pr[offset+img->width] + pr[offset+img->width+1];
cg = pg[offset] + pg[offset+1] +
pg[offset+img->width] + pg[offset+img->width+1];
cb = pb[offset] + pb[offset+1] +
pb[offset+img->width] + pb[offset+img->width+1];
pr[offset] = cr / 4.0;
pg[offset] = cg / 4.0;
pb[offset] = cb / 4.0;
}
}
return 0;
}
/* -------------------------------------------------------------------- */
int fimg_killborders(FloatImg *img)
{
int idx, h, w, o;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p )\n", __func__, img);
fprintf(stderr," type %d size %dx%d\n", img->type,
img->width, img->height);
#endif
if (img->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s : type %d invalide\n", __func__, img->type);
return -99;
}
h = img->height; w = img->width;
for (idx=0; idx<h; idx++) {
#define FAST 1
#if FAST
img->R[idx*w] = 0.0;
img->G[idx*w] = 0.0;
img->B[idx*w] = 0.0;
img->R[(idx*w)+w-1] = 0.0;
img->G[(idx*w)+w-1] = 0.0;
img->B[(idx*w)+w-1] = 0.0;
#else
fimg_plot_rgb(img, 0, idx, 0.0, 0.0, 0.0);
fimg_plot_rgb(img, w-1, idx, 0.0, 0.0, 0.0);
#endif
}
o = w * (h - 1);
for (idx=0; idx<w; idx++) {
#if FAST
img->R[idx] = 0.0;
img->G[idx] = 0.0;
img->B[idx] = 0.0;
img->R[idx+o] = 0.0;
img->G[idx+o] = 0.0;
img->B[idx+o] = 0.0;
#else
fimg_plot_rgb(img, idx, 0, 0.0, 0.0, 0.0);
fimg_plot_rgb(img, idx, h-1, 0.0, 0.0, 0.0);
#endif
}
return 0;
}
/* -------------------------------------------------------------------- */
int fimg_lissage_2x2(FloatImg *img)
{
int foo;
foo = fimg_lissage_2x2_a(img);
if (foo) {
fprintf(stderr, "%s: fail %d\n", __func__, foo);
return foo;
}
fimg_killborders(img);
return foo;
}
/* -------------------------------------------------------------------- */