Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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/*
* FLOATIMG
* distorsions géométriques - coredumping ?
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "../floatimg.h"
extern int verbosity;
/* --------------------------------------------------------------------- */
/*
* really crude function, need more work...
*/
int fimg_halfsize_0(FloatImg *src, FloatImg *dst, int notused)
{
int wd, hd;
int foo, x, y;
float pixel[3];
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__,
src, dst, notused);
#endif
/* no magic check here ? */
if (dst->width || dst->height) {
fprintf(stderr, "*** %s: image at %p not empty\n", __func__, dst);
fimg_describe(dst, "destination halfsize 0");
return -2;
}
wd = src->width / 2; hd = src->height / 2;
foo = fimg_create(dst, wd, hd, FIMG_TYPE_RGB);
if (foo) {
fprintf(stderr, "%s: err create %d\n", __func__, foo);
return -3;
}
for (y=0; y<hd; y++) {
for (x=0; x<wd; x++) {
foo = fimg_get_rgb(src, x*2, y*2, pixel);
if (foo) {
fprintf(stderr, "%s: err get %d\n", __func__, foo);
abort();
}
foo = fimg_plot_rgb(dst, x, y, pixel[0], pixel[1], pixel[2]);
if (foo) {
fprintf(stderr, "%s: err plot %d\n", __func__, foo);
abort();
}
}
}
return 0;
}
/* --------------------------------------------------------------------- */
int fimg_halfsize_1(FloatImg *src, FloatImg *dst, int notused)
{
int wd, hd;
int foo, x, y, x2, y2;
float ac;
if (dst->width || dst->height) {
fprintf(stderr, "*** %s: image at %p not empty\n", __func__, dst);
fimg_describe(dst, "destination halfsize 1");
return -2;
}
wd = src->width / 2; hd = src->height / 2;
if ( (foo = fimg_create(dst, wd, hd, FIMG_TYPE_RGB)) ) {
fprintf(stderr, "%s: err create %d\n", __func__, foo);
return -3;
}
#define WS (src->width)
#define WD (dst->width)
for (y=0; y<hd; y++) {
y2 = y * 2;
for (x=0; x<wd; x++) {
x2 = x * 2;
ac = src->R[(y2*WS)+x2] + src->R[(y2*WS)+x2+1] +
src->R[((1+y2)*WS)+x2] + src->R[((1+y2)*WS)+x2+1];
dst->R[y*WD +x] = ac / 4.0;
ac = src->G[(y2*WS)+x2] + src->G[(y2*WS)+x2+1] +
src->G[((1+y2)*WS)+x2] + src->G[((1+y2)*WS)+x2+1];
dst->G[y*WD +x] = ac / 4.0;
ac = src->B[(y2*WS)+x2] + src->B[(y2*WS)+x2+1] +
src->B[((1+y2)*WS)+x2] + src->B[((1+y2)*WS)+x2+1];
dst->B[y*WD +x] = ac / 4.0;
}
}
#undef WS
#undef WD
return 0;
}
/* --------------------------------------------------------------------- */
int fimg_extractor(FloatImg *in, FloatImg *out, FimgArea51 *rect)
{
int foo;
int xs, ys, xd, yd;
int count;
float rgb[3];
if (verbosity > 1) {
fimg_describe(in, "extractor: source");
fimg_describe(out, "extractor: destination");
// print_rectangle(rect);
}
count = 0;
for (yd=0; yd<rect->h; yd++) {
ys = yd + rect->y;
if ((ys<0) || (ys>=in->height)) continue;
for (xd=0; xd<rect->w; xd++) {
xs = xd + rect->x;
if ((xs<0) || (xs>=in->width)) continue;
fimg_get_rgb(in, xs, ys, rgb);
fimg_put_rgb(out, xd, yd, rgb);
count++;
}
}
// fprintf(stderr, "%s: %d pix moved\n", __func__, count);
return 0;
}
/* --------------------------------------------------------------------- */
/* ho, btw, you can have a locck at 'incrustator.c' :) */
/* --------------------------------------------------------------------- */
int fimg_mirror(FloatImg *src, FloatImg *dst, int notused)
{
float *fptr;
int line, col, offl;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p 0x%04x )\n", __func__,
src, dst, notused);
#endif
if (fimg_images_not_compatible(src, dst)) {
fprintf(stderr, "bad karma in %s\n", __func__);
return -9;
}
if (NULL == (fptr=alloca(src->width*sizeof(float)))) {
fprintf(stderr, "%s: no mem available\n", __func__);
#if MUST_ABORT
abort();
#endif
return -11;
}
for (line=0; line<src->height; line++) {
offl = line * src->width;
for (col=0; col<src->width; col++)
fptr[(src->width-1) - col] = src->R[offl+col];
memcpy(dst->R+offl, fptr, src->width*sizeof(float));
for (col=0; col<src->width; col++)
fptr[(src->width-1) - col] = src->G[offl+col];
memcpy(dst->G+offl, fptr, src->width*sizeof(float));
for (col=0; col<src->width; col++)
fptr[(src->width-1) - col] = src->B[offl+col];
memcpy(dst->B+offl, fptr, src->width*sizeof(float));
}
return 0;
}
/* --------------------------------------------------------------------- */