SkShaper: optionally disable harfbuzz

tools/using_skia_and_harfbuzz.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This sample progam demonstrates how to use Skia and HarfBuzz to
 // produce a PDF file from UTF-8 text in stdin.
 
@@ skipping 116 matching lines @@
 // Placement ///////////////////////////////////////////////////////////////////
 
 class Placement {
 public:
     Placement(const Config* conf, SkDocument *doc)
         : config(conf), document(doc), pageCanvas(nullptr) {
         white_paint.setColor(SK_ColorWHITE);
         glyph_paint.setColor(SK_ColorBLACK);
         glyph_paint.setFlags(SkPaint::kAntiAlias_Flag |
                              SkPaint::kSubpixelText_Flag);
-        glyph_paint.setTextSize(config->font_size.value);
+        glyph_paint.setTextSize(SkDoubleToScalar(config->font_size.value));
     }
 
     void WriteLine(const SkShaper& shaper, const char *text, size_t textBytes) {
         if (!pageCanvas || current_y > config->page_height.value) {
             if (pageCanvas) {
                 document->endPage();
             }
-            pageCanvas = document->beginPage(config->page_width.value,
-                                             config->page_height.value);
+            pageCanvas = document->beginPage(
+                    SkDoubleToScalar(config->page_width.value),
+                    SkDoubleToScalar(config->page_height.value));
             pageCanvas->drawPaint(white_paint);
             current_x = config->left_margin.value;
             current_y = config->line_spacing_ratio.value * config->font_size.value;
         }
         SkTextBlobBuilder textBlobBuilder;
         shaper.shape(&textBlobBuilder, glyph_paint, text, textBytes, SkPoint{0, 0});
         sk_sp<const SkTextBlob> blob(textBlobBuilder.build());
-        pageCanvas->drawTextBlob(blob.get(), current_x, current_y, glyph_paint);
-
+        pageCanvas->drawTextBlob(
+                blob.get(), SkDoubleToScalar(current_x),
+                SkDoubleToScalar(current_y), glyph_paint);
         // Advance to the next line.
         current_y += config->line_spacing_ratio.value * config->font_size.value;
     }
 
 private:
     const Config* config;
     SkDocument *document;
     SkCanvas *pageCanvas;
     SkPaint white_paint;
     SkPaint glyph_paint;
@@ skipping 39 matching lines @@
     }
     SkShaper shaper(typeface);
     assert(shaper.good());
     for (std::string line; std::getline(std::cin, line);) {
         placement.WriteLine(shaper, line.c_str(), line.size());
     }
 
     doc->close();
     return 0;
 }