Add glyph cache warming - prototype

A system for prewarming the cache using a single "RPC"
This improve performance by ~5X.

This is a checkin of rough code so I can use small
changes clean it up.

BUG=skia:7515

Change-Id: Id0192b4f533c257b0a7eea0170b1e25c336d6432
Reviewed-on: https://skia-review.googlesource.com/105440
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 14 insertions, 9 deletions

diff --git a/src/core/SkTypeface_remote.h b/src/core/SkTypeface_remote.h
index b8d972f1c9..750ec21ebe 100644
--- a/src/core/SkTypeface_remote.h
+++ b/src/core/SkTypeface_remote.h
@@ -12,6 +12,7 @@
 #include "SkDescriptor.h"
 #include "SkFontDescriptor.h"
 #include "SkFontStyle.h"
+#include "SkPaint.h"
 #include "SkScalerContext.h"
 #include "SkTypeface.h"
 
@@ -27,14 +28,6 @@ public:
             const SkTypefaceProxy& tf,
             const SkScalerContextRec& rec,
             SkPaint::FontMetrics*) = 0;
-    virtual void generateMetrics(
-            const SkTypefaceProxy& tf,
-            const SkScalerContextRec& rec,
-            SkGlyph* glyph) = 0;
-    virtual void generateImage(
-            const SkTypefaceProxy& tf,
-            const SkScalerContextRec& rec,
-            const SkGlyph& glyph)  = 0;
     virtual void generateMetricsAndImage(
             const SkTypefaceProxy& tf,
             const SkScalerContextRec& rec,
@@ -54,6 +47,11 @@ public:
             const SkDescriptor* desc,
             SkRemoteScalerContext* rsc);
 
+    void setFontMetrics(const SkPaint::FontMetrics& fontMetrics) {
+        fFontMetrics = fontMetrics;
+        fHaveFontMetrics = true;
+    }
+
 protected:
     unsigned generateGlyphCount(void) override { SK_ABORT("Should never be called."); return 0;}
     uint16_t generateCharToGlyph(SkUnichar uni) override {
@@ -72,10 +70,13 @@ private:
     static constexpr size_t kMinGlyphCount = 8;
     static constexpr size_t kMinGlyphImageSize = 16 /* height */ * 8 /* width */;
     static constexpr size_t kMinAllocAmount = kMinGlyphImageSize * kMinGlyphCount;
-    SkArenaAlloc  fAlloc{kMinAllocAmount};
 
     SkTypefaceProxy* typefaceProxy();
+
+    SkArenaAlloc  fAlloc{kMinAllocAmount};
     SkRemoteScalerContext* const fRemote;
+    bool fHaveFontMetrics{false};
+    SkPaint::FontMetrics fFontMetrics;
     typedef SkScalerContext INHERITED;
 };
 
@@ -90,6 +91,10 @@ public:
             , fFontId{fontId}
             , fRsc{rsc} { }
     SkFontID fontID() const {return fFontId;}
+    static SkTypefaceProxy* DownCast(SkTypeface* typeface) {
+        // TODO: how to check the safty of the down cast.
+        return (SkTypefaceProxy*) typeface;
+    }
 
 protected:
     int onGetUPEM() const override { SK_ABORT("Should never be called."); return 0; }