add portable and canonical font support for DM

tools/sk_tool_utils.cpp

Index: tools/sk_tool_utils.cpp
diff --git a/tools/sk_tool_utils.cpp b/tools/sk_tool_utils.cpp
index 1b35005d963a19146d429a912b643f1073ade5e1..1eaa5d9bcead1a7b9e8fa5eb3663a0145dcade90 100644
--- a/tools/sk_tool_utils.cpp
+++ b/tools/sk_tool_utils.cpp
@@ -6,14 +6,16 @@
  */
 
 #include "sk_tool_utils.h"
-#include "../src/fonts/SkTestScalerContext.h"
+#include "sk_tool_utils_flags.h"
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
+#include "SkTestScalerContext.h"
 
-namespace sk_tool_utils {
+DEFINE_bool(portableFonts, false, "Use portable fonts");

[mtklein, 2014/07/30 15:03:57]

What's the end game?  Ordinarily bots use --portableFonts, and we use
--resourceFonts to bootstrap?

[caryclark, 2014/07/30 15:45:32]

Today, this makes it easier to bring up a new reference piece of hardware by
comparing GMs across platforms. I use --portableFonts to help isolate GPU / CPU
bugs without getting distracted by font scalar differences. Then I use
--resourceFonts to verify that we draw the same or at least similarly with
different scalar engines.

The end game has multiple prongs:
- move the same set of fonts to all bots so that they can all use
--resourceFonts and produce more similar output
- add additional diversity like 'label fonts' so appropriate GMs would draw from
paths on all platforms all the time
- provide a mechanism so that a GM can opt out and always use resource fonts
(e.g., vertical font tests)
- add SkFontMgr support so that portable/resource/system fonts can exist
simultaneously as the GM requires

The purpose of this CL is to implement a skeleton towards these features, but is
not complete. For instance, this CL causes --portableFonts --pipe to fail since
redirecting SkFontMgr isn't implemented yet.

+DEFINE_bool(resourceFonts, false, "Use resource fonts");
 
-bool gEnablePortableTypeface = false;
+namespace sk_tool_utils {
 
 const char* colortype_name(SkColorType ct) {
     switch (ct) {
@@ -30,12 +32,21 @@ const char* colortype_name(SkColorType ct) {
     }
 }
 
-SkPaint::FontMetrics create_font(SkTDArray<SkPath*>& , SkTDArray<SkFixed>& );
-
-void set_portable_typeface(SkPaint* paint, SkTypeface::Style style) {
-    if (gEnablePortableTypeface) {
-        SkSafeUnref(paint->setTypeface(CreateTestTypeface(create_font, style)));
+SkTypeface* portable_typeface(const char* name, SkTypeface::Style style) {
+    SkTypeface* face;
+    if (FLAGS_portableFonts) {
+        face = create_font(name, style);
+    } else if (FLAGS_resourceFonts) {
+        face = resource_font(name, style);
+    } else {
+        face = SkTypeface::CreateFromName(name, style);
     }
+    return face;
+}
+
+void set_portable_typeface(SkPaint* paint, const char* name, SkTypeface::Style style) {
+    SkTypeface* face = portable_typeface(name, style);
+    SkSafeUnref(paint->setTypeface(face));
 }
 
 void write_pixels(SkCanvas* canvas, const SkBitmap& bitmap, int x, int y,