big commit for 2 new funcs

funcs/Makefile

@@ -3,7 +3,7 @@
 COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
 DEPS = ../floatimg.h Makefile
 OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
-	fimg-libpnm.o rampes.o sfx0.o
+	fimg-libpnm.o rampes.o sfx0.o geometry.o
 
 #---------------------------------------------------------------
 
@@ -30,6 +30,9 @@ misc-plots.o:		misc-plots.c $(DEPS)
 filtrage.o:		filtrage.c $(DEPS)
 	gcc $(COPT) -c $<
 
+geometry.o:		geometry.c $(DEPS)
+	gcc $(COPT) -c $<
+
 sfx0.o:			sfx0.c $(DEPS)
 	gcc $(COPT) -c $<
 

funcs/geometry.c

@@ -0,0 +1,56 @@
+/*
+ *		FLOATIMG
+ *	distorsions géométriques - coredumping ?
+ */
+
+#include  <stdio.h>
+
+#include  "../floatimg.h"
+
+/* --------------------------------------------------------------------- */
+/*
+ *	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");
+	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", foo);
+			abort();
+			}
+		foo = fimg_plot_rgb(dst, x, y, pixel[0], pixel[1], pixel[2]);
+		if (foo) {
+			fprintf(stderr, "%s: err plot %d\n", foo);
+			abort();
+			}
+		}
+
+	}
+return 0;
+}
+/* --------------------------------------------------------------------- */

funcs/sfx0.c

@@ -1,6 +1,6 @@
 /*
  *		FLOATIMG
- *	rampes diverses, trucs etranges 
+ *	effets spéciaux àlc sur les couleurs 
  */
 
 #include  <stdio.h>

funcs/t.c

@@ -10,8 +10,37 @@
 
 int		verbosity;
 
-int fimg_killcolors_a(FloatImg *fimg, float fval);
+/* --------------------------------------------------------------------- */
+int essai_geometrie(char *infile)
+{
+FloatImg	fimg, result;
+int		foo;
 
+if (NULL != infile) {
+	fprintf(stderr, "loading %s\n", infile);
+	fimg_create_from_dump(infile, &fimg);
+	}
+else	{
+	fimg_create(&fimg, 512, 512, FIMG_TYPE_RGB);
+	fimg_draw_something(&fimg);
+	}
+
+foo = fimg_save_as_pnm(&fimg, "source.pnm", 0);
+
+memset(&result, 0, sizeof(FloatImg));
+
+foo = fimg_halfsize_0(&fimg, &result, 0);
+fprintf(stderr, "retour halfsize -> %d\n", foo);
+if (foo) {
+	return -2;
+	}
+
+fimg_describe(&result, "result after halfsize");
+
+foo = fimg_save_as_pnm(&result, "something.pnm", 0);
+
+return 0;
+}
 /* --------------------------------------------------------------------- */
 int essai_sfx0(char *infile)
 {
@@ -134,7 +163,7 @@ int		foo;
 
 puts("++++++++++++++++++++++++++++++++");
 
-foo = essai_sfx0("03384.fimg");
+foo = essai_geometrie("foo.fimg");
 
 return 0;
 }