From 40bf700a3222d2a53ab9f0710f1a271d8e2955bb Mon Sep 17 00:00:00 2001
From: tth <tth@fubar.tetalab.org>
Date: Fri, 11 Jun 2021 06:55:40 +0200
Subject: [PATCH] + movepixels experiment

---
 .gitignore              |   1 +
 experiment/Makefile     |  10 ++-
 experiment/movepixels.c | 154 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 162 insertions(+), 3 deletions(-)
 create mode 100644 experiment/movepixels.c

diff --git a/.gitignore b/.gitignore
index 36c902e..aaa9626 100644
--- a/.gitignore
+++ b/.gitignore
@@ -85,4 +85,5 @@ experiment/*.fimg
 experiment/*.pnm
 experiment/*.o
 experiment/muxplanes
+experiment/movepixels
 
diff --git a/experiment/Makefile b/experiment/Makefile
index 67dd901..7855e93 100644
--- a/experiment/Makefile
+++ b/experiment/Makefile
@@ -1,12 +1,13 @@
 
-#  experiments
-
+#
+#  some ugly experiments, do not use in production
+#
 
 COPT = -Wall -fpic -g -DDEBUG_LEVEL=1 -lm
 DEPS = ../floatimg.h  ../libfloatimg.a Makefile
 LIBS = -ltiff -lpnglite -lcfitsio
 
-all:	assemblage extracteur muxplanes
+all:	assemblage extracteur muxplanes movepixels
 
 assemblage:	assemblage.c ${DEPS} 
 	gcc $(COPT) $< ../libfloatimg.a ${LIBS} -o $@
@@ -16,3 +17,6 @@ extracteur:	extracteur.c ${DEPS}
 
 muxplanes:	muxplanes.c ${DEPS}
 	gcc $(COPT) $<  ../libfloatimg.a ${LIBS} -o $@
+
+movepixels:	movepixels.c ${DEPS}
+	gcc $(COPT) $<  ../libfloatimg.a ${LIBS} -o $@
diff --git a/experiment/movepixels.c b/experiment/movepixels.c
new file mode 100644
index 0000000..bc5e57f
--- /dev/null
+++ b/experiment/movepixels.c
@@ -0,0 +1,154 @@
+/*
+ *		MOVEPIXELS
+ *
+ *	This is experimental, do not use in production !
+ *
+ */
+
+#include   <stdio.h>
+#include   <stdlib.h>
+#include   <stdint.h>
+
+#include   <floatimg.h>
+
+int		verbosity;
+
+/* ------------------------------------------------------------------- */
+int displace(FloatImg *psrc, FloatImg *pshift, FloatImg *pdst, float k)
+{
+int		xd, yd, xs, ys;
+float		rgb[3], disp[3], maxv;
+float		minmax[6];
+int		foo, inside, outside;
+float		dltr, dltg, dltb;	/* delta des minmax */
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %p %p %g )\n", __func__,
+			psrc, pshift, pdst, k);
+#endif
+
+if (FIMG_TYPE_RGB != psrc->type) {
+	fprintf(stderr, "%s: bad src type %d\n", __func__, psrc->type);
+	return -7;
+	}
+if (fimg_images_not_compatible(psrc, pshift)) {
+	fprintf(stderr, "%s: bad shift image %d\n", __func__, pshift->type);
+	return -8;
+	}
+if (fimg_images_not_compatible(psrc, pdst)) {
+	fprintf(stderr, "%s: bad dst image %d\n", __func__, pdst->type);
+	return -8;
+	}
+
+foo = fimg_get_minmax_rgb(pshift, minmax);
+if (verbosity) {
+	fimg_print_minmax(minmax, (char *)__func__);
+	}
+dltr = minmax[1] - minmax[0];
+dltg = minmax[3] - minmax[2];
+dltb = minmax[5] - minmax[4];
+if (verbosity) fprintf(stderr, "delta shift  %f %f %f\n", dltr, dltg, dltb);
+
+maxv = fimg_get_maxvalue(psrc);
+inside = outside = 0;
+
+/* hardcoded parameters. this is very dirty :) */
+
+#define  MULT  (140.0)
+#define  OFFS  (70.0)
+
+/* loop over all the pixels of the DESTINATION picture */
+for (yd=0; yd<pdst->height; yd++) {
+
+	for (xd=0; xd<pdst->width; xd++) {
+
+		fimg_get_rgb(pshift, xd, yd, disp);
+
+		xs = xd + ((disp[0]/dltr*MULT) - OFFS);
+		ys = yd + ((disp[2]/dltb*MULT) - OFFS);
+
+		if ( xs<0 || xs>psrc->width 	||
+		     ys<0 || ys>psrc->height ) {
+			rgb[0] = maxv;			/* fucking bug XXX */
+			rgb[1] = rgb[2] = 0.0;
+			outside++;
+			}
+		else {
+			fimg_get_rgb(psrc, xs, ys, rgb);
+			inside++;
+			}
+
+		fimg_put_rgb(pdst, xd, yd, rgb);
+
+		}
+
+	}
+
+// fprintf(stderr, "%s: inside %d outside %d\n", __func__, inside, outside);
+
+return 0;
+}
+/* ------------------------------------------------------------------- */
+
+int move_the_pixels(char *infile, char *statfile, char *outfile, int k)
+{
+int		foo;
+FloatImg	src, shift, dst;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %s %s 0x%04x )\n", __func__,
+				infile, outfile, k);
+#endif
+
+/* 'infile' contains the shifting values */
+foo = fimg_create_from_dump(infile, &shift);
+if (foo) {
+	fprintf(stderr, "%s: error loading '%s'\n", __func__, infile);
+	return foo;
+	}
+
+fimg_clone(&shift, &dst, 0);
+
+foo = fimg_create_from_dump(statfile, &src);
+if (foo) {
+	fprintf(stderr, "%s: error loading 'cumul.fimg'\n", __func__);
+	return foo;
+	}
+
+foo = displace(&src, &shift, &dst, 42.42);
+if (foo) {
+	fprintf(stderr, "%s: err %d in disp map 0\n", __func__, foo);
+	return foo;
+	}
+
+foo = fimg_export_picture(&dst, outfile, 0);
+if (foo) {
+	fprintf(stderr, "%s: err %d saving result\n", __func__, foo);
+	return foo;
+	}
+
+return 0;
+}
+/* ------------------------------------------------------------------- */
+
+int main(int argc, char *argv[])
+{
+int		foo;
+char		*srcfile, *dstfile;
+
+if (3 != argc) {
+	fprintf(stderr, "usage:\n\t%s src.fimg dst.fimg\n", argv[0]);
+	exit(1);
+	}
+
+srcfile = argv[1];
+dstfile = argv[2];
+verbosity = 0;
+
+foo = move_the_pixels(srcfile, "cumul.fimg", dstfile, 3);
+
+// fprintf(stderr, "move pixels %s -> %s = %d\n", srcfile, dstfile, foo);
+
+return 0;
+}
+/* ------------------------------------------------------------------- */