add colortable support to imagegenerator

tests/DrawBitmapRectTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkDiscardableMemoryPool.h"
 #include "SkImageGeneratorPriv.h"
 #include "SkMatrixUtils.h"
 #include "SkPaint.h"
 #include "SkRandom.h"
 #include "SkShader.h"
 #include "SkSurface.h"
 #include "Test.h"
 
 // A BitmapFactory that always fails when asked to return pixels.
 class FailureImageGenerator : public SkImageGenerator {
 public:
     FailureImageGenerator() { }
     virtual ~FailureImageGenerator() { }
-    virtual bool getInfo(SkImageInfo* info) SK_OVERRIDE {
+    
+protected:
+    virtual bool onGetInfo(SkImageInfo* info) SK_OVERRIDE {
         info->fWidth = 100;
         info->fHeight = 100;
         info->fColorType = kN32_SkColorType;
         info->fAlphaType = kPremul_SkAlphaType;
         return true;
     }
-    virtual bool getPixels(const SkImageInfo& info,
-                           void* pixels,
-                           size_t rowBytes) SK_OVERRIDE {
-        // this will deliberately return false if they are asking us
-        // to decode into pixels.
-        return false;
-    }
+    // default onGetPixels() returns false, which is what we want.
 };
 
 // crbug.com/295895
 // Crashing in skia when a pixelref fails in lockPixels
 //
 static void test_faulty_pixelref(skiatest::Reporter* reporter) {
     // need a cache, but don't expect to use it, so the budget is not critical
     SkAutoTUnref<SkDiscardableMemoryPool> pool(
         SkDiscardableMemoryPool::Create(10 * 1000, NULL));
     SkBitmap bm;
@@ skipping 265 matching lines @@
 
     // ensure that we draw nothing if srcR does not intersect the bitmap
     REPORTER_ASSERT(reporter, check_for_all_zeros(dst));
 
     test_nan_antihair();
     test_giantrepeat_crbug118018(reporter);
 
     test_treatAsSprite(reporter);
     test_faulty_pixelref(reporter);
 }