From 3114947224fd42013954da6c4cef28d31b1238e7 Mon Sep 17 00:00:00 2001
From: Chris Loer <chris.loer@gmail.com>
Date: Tue, 28 Nov 2017 14:03:28 -0800
Subject: LocalGlyphRasterizer takes a void* configuration input. If nothing is
 set, it doesn't rasterize glyphs locally.

---
 platform/darwin/src/local_glyph_rasterizer.mm | 22 ++++++++++++++--------
 src/mbgl/text/local_glyph_rasterizer.hpp      |  2 +-
 test/text/glyph_manager.test.cpp              |  4 ----
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/platform/darwin/src/local_glyph_rasterizer.mm b/platform/darwin/src/local_glyph_rasterizer.mm
index 944fca48c3..44658b7504 100644
--- a/platform/darwin/src/local_glyph_rasterizer.mm
+++ b/platform/darwin/src/local_glyph_rasterizer.mm
@@ -34,16 +34,18 @@ public:
     CTFontRefHandle font;
 };
 
-LocalGlyphRasterizer::LocalGlyphRasterizer(void*)
+LocalGlyphRasterizer::LocalGlyphRasterizer(void* configuration)
 {
-    NSDictionary *fontAttributes =
-              [NSDictionary dictionaryWithObjectsAndKeys:
-                      [NSNumber numberWithFloat:24.0], (NSString *)kCTFontSizeAttribute,
-                      nil];
+    if (configuration) {
+        NSMutableDictionary *fontAttributes = CFBridgingRelease((CFDictionaryRef)configuration);
+        fontAttributes[(NSString *)kCTFontSizeAttribute] = [NSNumber numberWithFloat:24.0];
 
-    CTFontDescriptorRefHandle descriptor(CTFontDescriptorCreateWithAttributes((CFDictionaryRef)fontAttributes));
+        CTFontDescriptorRefHandle descriptor(CTFontDescriptorCreateWithAttributes((CFDictionaryRef)fontAttributes));
 
-    impl = std::make_unique<Impl>(CTFontCreateWithFontDescriptor(*descriptor, 0.0, NULL));
+        impl = std::make_unique<Impl>(CTFontCreateWithFontDescriptor(*descriptor, 0.0, NULL));
+    } else {
+        impl = std::make_unique<Impl>((CTFontRef)NULL);
+    }
 }
 
 LocalGlyphRasterizer::~LocalGlyphRasterizer()
@@ -52,7 +54,7 @@ LocalGlyphRasterizer::~LocalGlyphRasterizer()
 bool LocalGlyphRasterizer::canRasterizeGlyph(const FontStack&, GlyphID glyphID) {
     // TODO: This is a rough approximation of the set of glyphs that will work with fixed glyph metrics
     // Either narrow this down to be conservative, or actually extract glyph metrics in rasterizeGlyph
-    return util::i18n::allowsIdeographicBreaking(glyphID);
+    return *(impl->font) && util::i18n::allowsIdeographicBreaking(glyphID);
 }
 
 // TODO: In theory we should be able to transform user-coordinate bounding box and advance
@@ -133,6 +135,10 @@ PremultipliedImage drawGlyphBitmap(GlyphID glyphID, CTFontRef font, Size size) {
 
 Glyph LocalGlyphRasterizer::rasterizeGlyph(const FontStack&, GlyphID glyphID) {
     Glyph fixedMetrics;
+    if (!*(impl->font)) {
+        return fixedMetrics;
+    }
+    
     fixedMetrics.id = glyphID;
 
     Size size(35, 35);
diff --git a/src/mbgl/text/local_glyph_rasterizer.hpp b/src/mbgl/text/local_glyph_rasterizer.hpp
index 753ebe372a..f43676dfa4 100644
--- a/src/mbgl/text/local_glyph_rasterizer.hpp
+++ b/src/mbgl/text/local_glyph_rasterizer.hpp
@@ -33,7 +33,7 @@ namespace mbgl {
 class LocalGlyphRasterizer {
 public:
     virtual ~LocalGlyphRasterizer();
-    LocalGlyphRasterizer(void* configuration);
+    LocalGlyphRasterizer(void* configuration = nullptr);
 
     // virtual so that test harness can override platform-specific behavior
     virtual bool canRasterizeGlyph(const FontStack&, GlyphID);
diff --git a/test/text/glyph_manager.test.cpp b/test/text/glyph_manager.test.cpp
index a50e42236f..a96e1b970c 100644
--- a/test/text/glyph_manager.test.cpp
+++ b/test/text/glyph_manager.test.cpp
@@ -19,10 +19,6 @@ static constexpr const size_t stubBitmapLength = 900;
 
 class StubLocalGlyphRasterizer : public LocalGlyphRasterizer {
 public:
-    StubLocalGlyphRasterizer()
-        : LocalGlyphRasterizer(0)
-    {}
-
     bool canRasterizeGlyph(const FontStack&, GlyphID glyphID) {
         return util::i18n::allowsIdeographicBreaking(glyphID);
     }
-- 
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