use SK_ScalarPI, and fix ARM build

git-svn-id: http://skia.googlecode.com/svn/trunk@10212 2bbb7eff-a529-9590-31e7-b0007b416f81

gyp/opts.gyp

@@ -96,6 +96,7 @@
         [ '(skia_arch_type == "arm" and armv7 == 0) or (skia_os == "ios")', {
           'sources': [
             '../src/opts/SkBitmapProcState_opts_none.cpp',
+            '../src/opts/SkBitmapFilter_opts_none.cpp',
             '../src/opts/SkBlitRow_opts_none.cpp',
             '../src/opts/SkUtils_opts_none.cpp',
           ],

src/core/SkBitmapFilter.h

@@ -12,10 +12,6 @@
 
 #include "SkMath.h"
 
-
-#define _USE_MATH_DEFINES
-#include <math.h>
-
 // size of the precomputed bitmap filter tables for high quality filtering.
 // Used to precompute the shape of the filter kernel.
 // Table size chosen from experiments to see where I could start to see a difference.
@@ -149,7 +145,7 @@ public:
         if (x > -FLT_EPSILON && x < FLT_EPSILON) {
             return 1.0f;  // Special case the sinc discontinuity at the origin.
         }
-        const float xpi = x * static_cast<float>(M_PI);
+        const float xpi = x * static_cast<float>(SK_ScalarPI);
 
         return ((sk_float_sin(xpi) / xpi) *  // sinc(x)
                 (0.54f + 0.46f * sk_float_cos(xpi / fWidth)));  // hamming(x)
@@ -169,7 +165,7 @@ class SkLanczosFilter: public SkBitmapFilter {
           if (x > -FLT_EPSILON && x < FLT_EPSILON) {              
               return 1.0f;  // Special case the discontinuity at the origin.
           }
-          float xpi = x * static_cast<float>(M_PI);
+          float xpi = x * static_cast<float>(SK_ScalarPI);
           return (sk_float_sin(xpi) / xpi) *  // sinc(x)
                   sk_float_sin(xpi / fWidth) / (xpi / fWidth);  // sinc(x/fWidth)
       }      

src/opts/SkBitmapProcState_opts_arm.cpp

@@ -217,3 +217,7 @@ void SkBitmapProcState::platformProcs() {
             break;
     }
 }
+
+void SkBitmapProcState::platformConvolutionProcs() {
+    // no specialization for ARM here yet.
+}