Adding debug SkScalerContext which returns random mask formats

TBR=reed@google.com
BUG=skia:

Review URL: https://codereview.chromium.org/1260473004

1 files changed, 54 insertions, 0 deletions

diff --git a/src/fonts/SkRandomScalerContext.h b/src/fonts/SkRandomScalerContext.h
new file mode 100644
index 0000000000..8ad22beff0
--- /dev/null
+++ b/src/fonts/SkRandomScalerContext.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkRandomScalerContext_DEFINED
+#define SkRandomScalerContext_DEFINED
+
+#include "SkScalerContext.h"
+#include "SkTypeface.h"
+
+/*
+ * This scaler context is for debug only purposes.  It will 'randomly' but deterministically return
+ * LCD / A8 / BW / RBGA masks based off of the Glyph ID
+ */
+
+class SkRandomTypeface : public SkTypeface {
+public:
+    SkRandomTypeface(SkTypeface* proxy, const SkPaint&);
+    virtual ~SkRandomTypeface();
+
+    SkTypeface* proxy() const { return fProxy; }
+    const SkPaint& paint() const { return fPaint; }
+
+protected:
+    SkScalerContext* onCreateScalerContext(const SkDescriptor*) const override;
+    void onFilterRec(SkScalerContextRec*) const override;
+    SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
+        PerGlyphInfo,
+        const uint32_t* glyphIDs,
+        uint32_t glyphIDsCount) const override;
+    SkStreamAsset* onOpenStream(int* ttcIndex) const override;
+    void onGetFontDescriptor(SkFontDescriptor*, bool* isLocal) const override;
+
+    int onCharsToGlyphs(const void* chars, Encoding encoding,
+                        uint16_t glyphs[], int glyphCount) const override;
+    int onCountGlyphs() const override;
+    int onGetUPEM() const override;
+
+    void onGetFamilyName(SkString* familyName) const override;
+    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
+
+    int onGetTableTags(SkFontTableTag tags[]) const override;
+    size_t onGetTableData(SkFontTableTag, size_t offset,
+                          size_t length, void* data) const override;
+
+private:
+    SkTypeface* fProxy;
+    SkPaint     fPaint;
+};
+
+#endif