[qcms] Fix overflow when reading parametric gamma curves

third_party/qcms/src/transform_util.c

 //  qcms
 //  Copyright (C) 2009 Mozilla Foundation
 //
 // Permission is hereby granted, free of charge, to any person obtaining
 // a copy of this software and associated documentation files (the "Software"),
 // to deal in the Software without restriction, including without limitation
 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
 // and/or sell copies of the Software, and to permit persons to whom the Software
 // is furnished to do so, subject to the following conditions:
 //
@@ skipping 178 matching lines @@
                 e = 0;
                 f = 0;
                 interval = -INFINITY;
         }       
         for (X = 0; X < 256; X++) {
                 float x = X / 255.0;
                 if (x >= interval) {
                         // XXX The equations are not exactly as definied in the spec but are
                         //     algebraic equivilent.
                         // TODO Should division by 255 be for the whole expression.
-                        gamma_table[X] = clamp_float(pow(a * x + b, y) + c + e);
+                        gamma_table[X] = clamp_float(powf(a * x + b, y) + (c + e));
                 } else {
                         gamma_table[X] = clamp_float(c * x + f);
                 }
         }
 }
 
 void compute_curve_gamma_table_type0(float gamma_table[256])
 {
         unsigned int i;
         for (i = 0; i < 256; i++) {
@@ skipping 454 matching lines @@
     if (!curve || curve->type != PARAMETRIC_CURVE_TYPE)
         return 0;
 
     size = COUNT_TO_LENGTH[curve->count];
 
     if (data)
         memcpy(data, curve->parameter, size * sizeof(float));
 
     return size;
 }