making operators from garbage

doc/the_floatimg_hack.tex

@@ -130,6 +130,24 @@ La première contient les choses qui sont relativement figées,
 et la seconde celles qui risquent de bouger. Cette classification
 est en fait arbitraire.
 
+\subsection{Structures, macros\dots}
+
+\begin{verbatim}
+/*
+ *      in memory descriptor
+ */
+typedef struct {
+        int             width;
+        int             height;
+        int             type;
+        float           fval;
+        int             count;
+        float           *R, *G, *B, *A;
+        int             reserved;
+        } FloatImg;
+\end{verbatim}\index{FloatImg}
+
+
 \subsection{lib/}\index{lib/}
 
 Première chose, la gestion dynamique de la mémoire occupées

floatimg.h

@@ -46,6 +46,11 @@ int   fimg_plot_rgb (FloatImg *head, int x, int y, float r, float g, float b);
 int   fimg_clear(FloatImg *fimg);
 int   fimg_add_rgb(FloatImg *head, int x, int y, float r, float g, float b);
 
+/*	'operats' module 		*/
+int fimg_add(FloatImg *a, FloatImg *b, FloatImg *d);
+int fimg_sub(FloatImg *a, FloatImg *b, FloatImg *d);
+int fimg_mul(FloatImg *a, FloatImg *b, FloatImg *d);
+
 /*	PNM files module		*/
 int fimg_save_as_pnm(FloatImg *head, char *fname, int notused);
 int fimg_load_from_pnm(char *fname, FloatImg *head, int notused);

lib/Makefile

@@ -4,7 +4,7 @@
 
 COPT = -Wall -fpic -g -pg -no-pie  -DDEBUG_LEVEL=0
 OBJS = fimg-core.o fimg-pnm.o fimg-file.o fimg-math.o	\
-	fimg-timers.o
+	fimg-timers.o operators.o
 DEPS = Makefile ../floatimg.h
 
 # modify it 'as you like'
@@ -13,7 +13,7 @@ AR=ar
 all:	$(OBJS) ../libfloatimg.a
 
 t:	t.c ../libfloatimg.a $(DEPS)
-	gcc $(COPT) $< ../libfloatimg.a -o $@
+	gcc $(COPT) $< ../libfloatimg.a -lm -o $@
 
 # --------------------------------------------
 
@@ -23,6 +23,9 @@ t:	t.c ../libfloatimg.a $(DEPS)
 fimg-core.o:	fimg-core.c $(DEPS)
 	gcc $(COPT) -c $<
 
+operators.o:	operators.c $(DEPS)
+	gcc $(COPT) -c $<
+
 fimg-pnm.o:	fimg-pnm.c $(DEPS)
 	gcc $(COPT) -c $<
 

lib/fimg-file.c

@@ -64,7 +64,7 @@ fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, fimg,
 #endif
 
 if (3 != fimg->type) {
-	fprintf(stderr, "%s : bat type %d\n", __func__, fimg->type);
+	fprintf(stderr, "%s : bad type %d\n", __func__, fimg->type);
 	return -8;
 	} 
 

lib/fimg-pnm.c

@@ -22,7 +22,7 @@ int fimg_load_from_pnm(char *fname, FloatImg *head, int notused)
 FILE		*fp;
 int		width, height, maxval;
 int		foo, line, column;
-unsigned char	*buffline, *idxrd;
+unsigned char	*buffline, *idxrd, dummychar;
 float		*Rptr, *Gptr, *Bptr;
 
 if (NULL==head) {
@@ -56,7 +56,12 @@ if (foo) {
         exit(1);
         }
 
+#if DEBUG_LEVEL
+fread(&dummychar, 1, 1, fp);
+fprintf(stderr, "%s : dummychar %xx\n", __func__, dummychar);
+#else
 fseek(fp, 1L, SEEK_CUR);		/* black magic */
+#endif
 
 Rptr = head->R;    Gptr = head->G;    Bptr = head->B;
 for (line=0; line<height; line++) {
@@ -89,7 +94,7 @@ fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, head,
 						fname, notused);
 #endif
 
-if (head->type != 3) {
+if (head->type != FIMG_TYPE_RGB) {
 #if DEBUG_LEVEL 
 	fprintf(stderr, "%s : type %d is bad.\n", __func__, head->type);
 #endif

lib/operators.c

@@ -0,0 +1,95 @@
+/*
+ *		OPERATORS
+ *
+ *
+ */
+
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <unistd.h>
+#include  <string.h>
+
+#include  "../floatimg.h"
+
+extern int verbosity;		/* must be declared around main() */
+
+/* ---------------------------------------------------------------- */
+int fimg_add(FloatImg *a, FloatImg *b, FloatImg *d)
+{
+int		idx, nbiter;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %p %p )\n", __func__, a, b, d);
+#endif
+
+if (3 != a->type || 3 != b->type || 3 != d->type) {
+	fprintf(stderr, "%s : got a bad type fimg\n", __func__);
+	return -8;
+	} 
+
+nbiter = a->width * a->height;
+
+for (idx=0; idx<nbiter; idx++) {
+	d->R[idx] = a->R[idx] + b->R[idx];
+	d->G[idx] = a->G[idx] + b->G[idx];
+	d->B[idx] = a->B[idx] + b->B[idx];
+	}
+
+return -1;
+}
+/* ---------------------------------------------------------------- */
+/*
+ *		A - B -> D
+ */
+int fimg_sub(FloatImg *a, FloatImg *b, FloatImg *d)
+{
+int		idx, nbiter;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %p %p )\n", __func__, a, b, d);
+#endif
+
+if (3 != a->type || 3 != b->type || 3 != d->type) {
+	fprintf(stderr, "%s : got a bad type fimg\n", __func__);
+	return -8;
+	} 
+
+nbiter = a->width * a->height;
+
+for (idx=0; idx<nbiter; idx++) {
+	d->R[idx] = fabs(a->R[idx] - b->R[idx]);
+	d->G[idx] = fabs(a->G[idx] - b->G[idx]);
+	d->B[idx] = fabs(a->B[idx] - b->B[idx]);
+	}
+
+return -1;
+}
+/* ---------------------------------------------------------------- */
+/* ---------------------------------------------------------------- */
+/*
+ *		A * B -> D
+ */
+int fimg_mul(FloatImg *a, FloatImg *b, FloatImg *d)
+{
+int		idx, nbiter;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %p %p )\n", __func__, a, b, d);
+#endif
+
+if (3 != a->type || 3 != b->type || 3 != d->type) {
+	fprintf(stderr, "%s : got a bad type fimg\n", __func__);
+	return -8;
+	} 
+
+nbiter = a->width * a->height;
+
+for (idx=0; idx<nbiter; idx++) {
+	d->R[idx] = a->R[idx] * b->R[idx];
+	d->G[idx] = a->G[idx] * b->G[idx];
+	d->B[idx] = a->B[idx] * b->B[idx];
+	}
+
+return -1;
+}
+/* ---------------------------------------------------------------- */

lib/t.c

@@ -2,35 +2,63 @@
 #include  <stdlib.h>
 #include  <unistd.h>
 #include  <string.h>
+#include  <math.h>
 
 #include  "../floatimg.h"
 
 int		verbosity;
 
+/* ---------------------------------------------------------------- */
+int petit_dessin(FloatImg *img)
+{
+int		x, y;
+float		r, g, b;
+
+for (y=0; y<img->height; y++) {
+
+	r = (float)y / (float)img->height;
+
+	for (x=0; x<img->width; x++) {
+
+		g = (float)x / (float)img->width;
+		b = 0.0;;
+
+		fimg_plot_rgb(img, x, y, r, g, b);
+
+		}
+
+	}
+
+return -1;
+}
+/* ---------------------------------------------------------------- */
 
 int main(int argc, char *argv[])
 {
 int		foo;
-FloatImg 	fimg;
+FloatImg 	dessin, noise, result;
 int		datas[3];
-char		*fname = "foo.fimg";
-verbosity = 1;
 
-fimg_print_version(0);
+verbosity = 1;
 
-foo = fimg_create(&fimg, 640, 480, 3);
-printf("retour fimg_create ---> %d\n", foo);
+fimg_print_version(1);
 
-fimg_printhead(&fimg);
-fimg_describe(&fimg, "vroum");
+foo = fimg_create(&dessin, 640, 480, 3);
+petit_dessin(&dessin);
+fimg_save_as_pnm(&dessin, "dessin.pnm",  0);
 
-// fimg_save_as_pnm(&fimg, "foo.pnm",  0);
-foo = fimg_dump_to_file(&fimg, fname, 0);
+foo = fimg_create(&noise, 640, 480, 3);
+fimg_drand48(&noise, 1.0);
+fimg_save_as_pnm(&noise, "noise.pnm",  0);
 
-foo = fimg_fileinfos("foo.fimg", datas);
+foo = fimg_create(&result, 640, 480, 3);
 
-printf("%s : largeur %d hauteur %d type %d\n",
-		fname, datas[0], datas[1], datas[2]);
+foo = fimg_add(&dessin, &noise, &result);
+fimg_save_as_pnm(&result, "r_add.pnm",  0);
+foo = fimg_sub(&dessin, &noise, &result);
+fimg_save_as_pnm(&result, "r_sub.pnm",  0);
+foo = fimg_mul(&dessin, &noise, &result);
+fimg_save_as_pnm(&result, "r_mul.pnm",  0);
 
 return 0;
 }