1 files changed, 68 insertions, 0 deletions
diff --git a/chromium/third_party/skia/experimental/PdfViewer/inc/SkPdfTokenLooper.h b/chromium/third_party/skia/experimental/PdfViewer/inc/SkPdfTokenLooper.h
new file mode 100644
index 00000000000..f3897cc78f5
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+++ b/chromium/third_party/skia/experimental/PdfViewer/inc/SkPdfTokenLooper.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPdfTokenLooper_DEFINED
+#define SkPdfTokenLooper_DEFINED
+
+#include "SkPdfNativeTokenizer.h"
+// For SkPdfResult
+#include "SkPdfUtils.h"
+
+class SkCanvas;
+class SkPdfContext;
+
+/**
+ *  An object which reads tokens from a tokenizer and draws it to an SkCanvas.
+ *  FIXME (scroggo): Can this be an interface? See http://goo.gl/AXQtkH
+ */
+class SkPdfTokenLooper {
+public:
+    /**
+     *  Create a looper with no parent.
+     *  @param tokenizer SkPdfNativeTokenizer for reading tokens.
+     *  @param pdfContext Context for drawing state.
+     *  @param canvas Target SkCanvas for drawing.
+     */
+    SkPdfTokenLooper(SkPdfNativeTokenizer* tokenizer,
+                     SkPdfContext* pdfContext,
+                     SkCanvas* canvas)
+        : fParent(NULL)
+        , fTokenizer(tokenizer)
+        , fPdfContext(pdfContext)
+        , fCanvas(canvas) {}
+
+    /**
+     *  Create a looper as a child of parent. It will share the
+     *  SkPdfContext, SkPdfTokenizer, and SkCanvas with its parent.
+     */
+    explicit SkPdfTokenLooper(SkPdfTokenLooper* parent)
+        : fParent(parent)
+        , fTokenizer(parent->fTokenizer)
+        , fPdfContext(parent->fPdfContext)
+        , fCanvas(parent->fCanvas) {}
+
+    virtual ~SkPdfTokenLooper() {}
+
+    /**
+     *  Consume a token, and draw to fCanvas as directed.
+     */
+    virtual SkPdfResult consumeToken(PdfToken& token) = 0;
+
+    /**
+     *  Consume all the tokens this looper can handle.
+     */
+    virtual void loop() = 0;
+
+protected:
+    // All are unowned pointers.
+    SkPdfTokenLooper*       fParent;
+    SkPdfNativeTokenizer*   fTokenizer;
+    SkPdfContext*           fPdfContext;
+    SkCanvas*               fCanvas;
+};
+
+#endif // SkPdfTokenLooper_DEFINED