move intensive computing/rendering from bench constructor to onPreDraw.

bench/BitmapRectBench.cpp

Index: bench/BitmapRectBench.cpp
===================================================================
--- bench/BitmapRectBench.cpp	(revision 10404)
+++ bench/BitmapRectBench.cpp	(working copy)
@@ -13,7 +13,7 @@
 #include "SkRandom.h"
 #include "SkString.h"
 
-static void drawIntoBitmap(const SkBitmap& bm) {
+static void draw_into_bitmap(const SkBitmap& bm) {
     const int w = bm.width();
     const int h = bm.height();
 
@@ -45,6 +45,8 @@
     uint8_t     fAlpha;
     SkString    fName;
     SkRect      fSrcR, fDstR;
+    static const int kWidth = 128;
+    static const int kHeight = 128;
     enum { N = SkBENCHLOOP(300) };
 public:
     BitmapRectBench(void* param, U8CPU alpha, bool doFilter, bool slightMatrix) : INHERITED(param) {
@@ -52,37 +54,38 @@
         fDoFilter = doFilter;
         fSlightMatrix = slightMatrix;
 
-        const int w = 128;
-        const int h = 128;
+        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, kWidth, kHeight);
+    }
 
-        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, w, h);
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        fName.printf("bitmaprect_%02X_%sfilter_%s",
+                     fAlpha, fDoFilter ? "" : "no",
+                     fSlightMatrix ? "trans" : "identity");
+        return fName.c_str();
+    }
+
+    virtual void onPreDraw() SK_OVERRIDE {
         fBitmap.allocPixels();
         fBitmap.setIsOpaque(true);
         fBitmap.eraseColor(SK_ColorBLACK);
-        drawIntoBitmap(fBitmap);
+        draw_into_bitmap(fBitmap);
 
-        fSrcR.iset(0, 0, w, h);
-        fDstR.iset(0, 0, w, h);
+        fSrcR.iset(0, 0, kWidth, kHeight);
+        fDstR.iset(0, 0, kWidth, kHeight);
 
-        if (slightMatrix) {
+        if (fSlightMatrix) {
             // want fractional translate
             fDstR.offset(SK_Scalar1 / 3, SK_Scalar1 * 5 / 7);
             // want enough to create a scale matrix, but not enough to scare
             // off our sniffer which tries to see if the matrix is "effectively"
             // translate-only.
-            fDstR.fRight += SK_Scalar1 / (w * 60);
+            fDstR.fRight += SK_Scalar1 / (kWidth * 60);
         }
     }
 
-protected:
-    virtual const char* onGetName() {
-        fName.printf("bitmaprect_%02X_%sfilter_%s",
-                     fAlpha, fDoFilter ? "" : "no",
-                     fSlightMatrix ? "trans" : "identity");
-        return fName.c_str();
-    }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkRandom rand;
 
         SkPaint paint;