fix misc asserts and checks found by fuzzer

samplecode/SampleFilterFuzz.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SampleCode.h"
 #include "Sk1DPathEffect.h"
 #include "Sk2DPathEffect.h"
 #include "SkAlphaThresholdFilter.h"
@@ skipping 186 matching lines @@
 
 static SkFilterQuality make_filter_quality() {
     return static_cast<SkFilterQuality>(R(kHigh_SkFilterQuality+1));
 }
 
 static SkTypeface::Style make_typeface_style() {
     return static_cast<SkTypeface::Style>(R(SkTypeface::kBoldItalic+1));
 }
 
 static SkPath1DPathEffect::Style make_path_1d_path_effect_style() {
-    return static_cast<SkPath1DPathEffect::Style>(R(SkPath1DPathEffect::kStyleCount));
+    return static_cast<SkPath1DPathEffect::Style>(R((int)SkPath1DPathEffect::kLastEnum_Style + 1));
 }
 
 static SkColor make_color() {
     return (R(2) == 1) ? 0xFFC0F0A0 : 0xFF000090;
 }
 
 static SkDropShadowImageFilter::ShadowMode make_shadow_mode() {
     return (R(2) == 1) ? SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode :
                          SkDropShadowImageFilter::kDrawShadowOnly_ShadowMode;
 }
@@ skipping 302 matching lines @@
     paint.setStyle(make_paint_style());
     paint.setColor(make_color());
     paint.setStrokeWidth(make_scalar());
     paint.setStrokeMiter(make_scalar());
     paint.setStrokeCap(make_paint_cap());
     paint.setStrokeJoin(make_paint_join());
     paint.setColorFilter(make_color_filter());
     paint.setXfermodeMode(make_xfermode());
     paint.setPathEffect(make_path_effect());
     paint.setMaskFilter(make_mask_filter());
-    SkAutoTUnref<SkTypeface> typeface(
-        SkTypeface::CreateFromName(make_font_name().c_str(), make_typeface_style()));
-    paint.setTypeface(typeface);
+
+    if (false) {
+        // our validating buffer does not support typefaces yet, so skip this for now
+        SkAutoTUnref<SkTypeface> typeface(
+                      SkTypeface::CreateFromName(make_font_name().c_str(), make_typeface_style()));
+        paint.setTypeface(typeface);
+    }
+
     SkLayerRasterizer::Builder rasterizerBuilder;
     SkPaint paintForRasterizer;
     if (R(2) == 1) {
         paintForRasterizer = make_paint();
     }
     rasterizerBuilder.addLayer(paintForRasterizer);
     SkAutoTUnref<SkRasterizer> rasterizer(rasterizerBuilder.detachRasterizer());
     paint.setRasterizer(rasterizer);
     paint.setImageFilter(make_image_filter());
     SkAutoDataUnref data(make_3Dlut(nullptr, make_bool(), make_bool(), make_bool()));
@@ skipping 273 matching lines @@
     }
 
 private:
     typedef SkView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ImageFilterFuzzView; }
 static SkViewRegister reg(MyFactory);