reading PNG with pnglite is wtf

funcs/t.c

@@ -1,4 +1,5 @@
 /*
+ *	tests des fonctions diverses
  */
 
 #include <stdio.h>
@@ -6,7 +7,8 @@
 #include <string.h>
 #include  <pam.h>
 
-
+#undef 		DEBUG_LEVEL
+#define		DEBUG_LEVEL	1
 
 #include "../floatimg.h"
 
@@ -48,6 +50,8 @@ return 0;
 /* --------------------------------------------------------------------- */
 /*
  *	nouveau 7 octobre 2020 pendant sonoptic
+ *
+ *	inspiration:  Olivier Baudu
  */
 
 int essai_qsort_rgb(char *infile, char *outfile)
@@ -314,10 +318,8 @@ if (foo) {
 	return -44;
 	}
 
-
 fimg_filter_3x3(&src, &dst, &filter_a);
 
-
 foo = fimg_clamp_negativ(&dst);
 
 if (foo) {
@@ -539,6 +541,30 @@ fprintf(stderr, "make h deg -> %d\n", foo);
 foo = fimg_save_as_pnm(&fimg, "vdeg.pnm", 0);
 fprintf(stderr, "%s: save as pnm -> %d\n", __func__, foo);
 
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int essai_lecture_png(char *fname, char *outfile, int notused)
+{
+FloatImg	fimg;
+int		foo;
+
+fprintf(stderr, ">>> %s ( '%s' %d  )\n", __func__, fname, notused);
+
+memset(&fimg, 0, sizeof(FloatImg));
+foo = fimg_create_from_png(fname, &fimg);
+if (foo) {
+	fprintf(stderr, "%s: createfrom -> %d\n", __func__, foo);
+	return foo;
+	}
+fimg_describe(&fimg, "created from png");
+
+foo = fimg_export_picture(&fimg, outfile, 0);
+if (foo) {
+	fprintf(stderr, "%s : err %d saving result to %s\n", __func__,
+				foo, outfile);
+	return foo;
+	}
 return 0;
 }
 /* --------------------------------------------------------------------- */
@@ -595,7 +621,7 @@ return 0;
 /* --------------------------------------------------------------------- */
 enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff,
 			Histo, Hsv, Classif, Ctr2x2, Qsortrgb,
-			Displace  };
+			Displace, ReadPNG  };
 typedef struct {
 	char	*name;
 	int	Cmd;
@@ -616,6 +642,7 @@ Command commands[] = {
 	{ "ctr2x2",	Ctr2x2		},
 	{ "qsortrgb",	Qsortrgb	},
 	{ "displace",	Displace	},
+	{ "readpng",	ReadPNG		},
 	{ NULL,		0		}
 	} ;
 
@@ -733,6 +760,9 @@ switch(opt) {
 	case Displace:
 		foo = essai_displacement(filename, outfile);
 		break;
+	case ReadPNG:
+		foo = essai_lecture_png(filename, outfile, 0);
+		break;
 	default:
 		fprintf(stderr, "%s : bad command\n", command);
 		exit(1);