remove tracking code, as it polutes the code readability. Should be added back, in a less eficient …

experimental/PdfViewer/pdf_viewer_main.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 "SkCanvas.h"
 #include "SkCommandLineFlags.h"
 #include "SkDevice.h"
@@ skipping 31 matching lines @@
              "\tminimal parsing to ensure correctness. Default 0 (disabled).");
 DEFINE_int32(benchRender, 0, "Render the pdf content N times. Default 0 (disabled)");
 DEFINE_string2(config, c, "8888", "Canvas to render:\n"
                                   "\t8888 - argb\n"
 
 #if SK_SUPPORT_GPU
                                   "\tgpu: use the gpu\n"
 #endif
                                   "\tnul - render in null canvas, any draw will just return.\n"
                );
+DEFINE_bool2(transparentBackground, t, false, "Make background transparent instead of white.");
 
 
 // TODO(edisonn): add config for device target(gpu, raster, pdf), + ability not to render at all
 
 /**
  * Given list of directories and files to use as input, expects to find .pdf
  * files and it will convert them to .png files writing them in the same directory
  * one file for each page.
  *
  * Returns zero exit code if all .pdf files were converted successfully,
@@ skipping 87 matching lines @@
  */
 static bool make_output_filepath(SkString* path, const SkString& dir,
                                  const SkString& name,
                                  int page) {
     make_filepath(path, dir, name);
     return add_page_and_replace_filename_extension(path, page,
                                                    PDF_FILE_EXTENSION,
                                                    PNG_FILE_EXTENSION);
 }
 
-static void setup_bitmap(SkBitmap* bitmap, int width, int height, SkColor color = SK_ColorTRANSPARENT) {
+static void setup_bitmap(SkBitmap* bitmap, int width, int height, SkColor color) {
     bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height);
 
     bitmap->allocPixels();
     bitmap->eraseColor(color);
 }
 
 /** Write the output of pdf renderer to a file.
  * @param outputDir Output dir.
  * @param inputFilename The skp file that was read.
  * @param renderer The object responsible to write the pdf file.
@@ skipping 22 matching lines @@
     } else {
         // 8888
         SkRect rect = renderer.MediaBox(page < 0 ? 0 :page);
 
         SkBitmap bitmap;
         SkScalar width = SkScalarMul(rect.width(),  SkDoubleToScalar(sqrt(FLAGS_DPI / 72.0)));
         SkScalar height = SkScalarMul(rect.height(),  SkDoubleToScalar(sqrt(FLAGS_DPI / 72.0)));
 
         rect = SkRect::MakeWH(width, height);
 
+        SkColor background = FLAGS_transparentBackground ? SK_ColorTRANSPARENT : SK_ColorWHITE;
+
 #ifdef PDF_DEBUG_3X
-        setup_bitmap(&bitmap, 3 * (int)SkScalarToDouble(width), 3 * (int)SkScalarToDouble(height));
+        setup_bitmap(&bitmap, 3 * (int)SkScalarToDouble(width), 3 * (int)SkScalarToDouble(height), background);
 #else
-        setup_bitmap(&bitmap, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height));
+        setup_bitmap(&bitmap, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height), background);
 #endif
         SkAutoTUnref<SkBaseDevice> device;
         if (strcmp(FLAGS_config[0], "8888") == 0) {
             device.reset(SkNEW_ARGS(SkBitmapDevice, (bitmap)));
         }
 #if SK_SUPPORT_GPU
         else if (strcmp(FLAGS_config[0], "gpu") == 0) {
             SkAutoTUnref<GrSurface> target;
             GrContext* gr = gContextFactory.get(GrContextFactory::kNative_GLContextType);
             if (gr) {
@@ skipping 163 matching lines @@
     }
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif