added fimg_killcolors_a effect

funcs/sfx0.c

@@ -0,0 +1,37 @@
+/*
+ *		FLOATIMG
+ *	rampes diverses, trucs etranges 
+ */
+
+#include  <stdio.h>
+
+#include  "../floatimg.h"
+
+/* --------------------------------------------------------------------- */
+/*
+ *	OMG ! a Color Graphic Adaptor emulator :)
+ */
+int fimg_killcolors_a(FloatImg *fimg, float fval)
+{
+int		nbpix, foo;
+
+if (FIMG_TYPE_RGB != fimg->type) {
+	fprintf(stderr, "%s: bad src type %d on %p\n", __func__,
+					fimg->type, fimg);
+	return -8;
+	}
+
+nbpix = fimg->width * fimg->height;
+
+for (foo=0; foo<nbpix; foo++) {
+
+	if (fimg->R[foo] > fimg->G[foo])
+		fimg->B[foo] = fimg->R[foo];
+	else
+		fimg->B[foo] = fimg->G[foo];
+	
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */