From 4ce99f0aff34dd3e64561baab7b79127f28a8cd4 Mon Sep 17 00:00:00 2001
From: Jean-Yves Lamoureux <jylam@lnxscene.org>
Date: Wed, 13 Jul 2005 17:45:47 +0000
Subject: [PATCH]  * src/math.c src/bitmap.c src/caca.h Removed powf call,
 added caca_powf, to remove libm depencies and problems on old
 compilers/linkers.

---
 src/bitmap.c |  3 +--
 src/caca.h   |  1 +
 src/math.c   | 23 +++++++++++++++++++++++
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/bitmap.c b/src/bitmap.c
index 5e95f1c..3686291 100644
--- a/src/bitmap.c
+++ b/src/bitmap.c
@@ -45,7 +45,6 @@ typedef unsigned int uint32_t;
 #include <stdlib.h>
 #include <limits.h>
 #include <string.h>
-#include <math.h>
 
 #include "caca.h"
 #include "caca_internals.h"
@@ -338,7 +337,7 @@ void caca_set_bitmap_gamma(struct caca_bitmap *bitmap, float gammaval)
     bitmap->gammaval = gammaval;
 
     for(i = 0; i < 4096; i++)
-        bitmap->gammatab[i] = 4096.0 * powf((float)i / 4096.0, 1.0 / gammaval);
+        bitmap->gammatab[i] = 4096.0 * caca_powf((float)i / 4096.0, 1.0 / gammaval);
 }
 
 /**
diff --git a/src/caca.h b/src/caca.h
index f98f8da..c3bb4c1 100644
--- a/src/caca.h
+++ b/src/caca.h
@@ -317,6 +317,7 @@ void caca_fill_triangle(int, int, int, int, int, int, char);
  *  @{ */
 int caca_rand(int, int);
 unsigned int caca_sqrt(unsigned int);
+float caca_powf(float x, float y);
 /*  @} */
 
 /** \defgroup sprite Sprite handling
diff --git a/src/math.c b/src/math.c
index 9d93da7..59a7ce2 100644
--- a/src/math.c
+++ b/src/math.c
@@ -78,3 +78,26 @@ unsigned int caca_sqrt(unsigned int a)
     return 2 * caca_sqrt(a / 4);
 }
 
+
+/**
+ * \brief powf substitute (x^y)
+ * \param x The value to be raised
+ * \param y The power to raise x of.
+ * \return \p x raised to the power of \p y
+ */
+
+float caca_powf(float x, float y)
+{
+    int i=((int)y);
+    float r=x;
+
+    if(((int)y)==1 || ((int)x)==1)
+        return x;
+
+    i--;
+    while(i--)
+    {
+        r*=x;
+    }
+    return r;
+}