SkPDFCanon

src/pdf/SkPDFCanon.h

+/*
+ * 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 SkPDFCanon_DEFINED
+#define SkPDFCanon_DEFINED
+
+#include "SkPDFShader.h"
+#include "SkThread.h"
+#include "SkTDArray.h"
+
+struct SkIRect;
+class SkMatrix;
+class SkPDFFont;
+class SkPDFGraphicState;
+class SkPaint;
+class SkShader;
+
+// This class's fields and methods will eventually become part of
+// SkPDFDocument/SkDocument_PDF.  For now, it exists as a singleton to
+// preflight that transition.  This replaces three global arrays in
+// SkPDFFont, SkPDFShader, and SkPDFGraphicsContext.
+//
+// IF YOU ARE LOOKING AT THIS API PLEASE DO NOT WRITE THE CHANGE
+// YOU ARE ABOUT TO WRITE WITHOUT TALKING TO HALCANARY@.
+//
+// Note that this class does not create, delete, reference or
+// dereference the SkPDFObject objects that it indexes.  It is up to
+// the caller to manage the lifetime of these objects.
+class SkPDFCanon : SkNoncopyable {
+public:
+    SkPDFCanon();
+    ~SkPDFCanon();
+
+    static SkPDFCanon& GetCanon();
+
+    // This mutexes will be removed once this class is subsumed into
+    // SkPDFDocument.
+    static SkBaseMutex& GetFontMutex();
+    static SkBaseMutex& GetShaderMutex();
+    static SkBaseMutex& GetPaintMutex();
+
+    // Returns exact match if there is one.  If not, it returns NULL.
+    // If there is no exact match, but there is a related font, we
+    // still return NULL, but also set *relatedFont.
+    SkPDFFont* findFont(uint32_t fontID,
+                        uint16_t glyphID,
+                        SkPDFFont** relatedFont) const;
+    void addFont(SkPDFFont* font, uint32_t fontID, uint16_t fGlyphID);
+    void removeFont(SkPDFFont*);
+
+    SkPDFShader* findShader(const SkPDFShader::State&) const;
+    void addShader(SkPDFShader*);
+    void removeShader(SkPDFShader*);
+
+    SkPDFGraphicState* findGraphicState(const SkPaint&) const;
+    void addGraphicState(SkPDFGraphicState*);
+    void removeGraphicState(SkPDFGraphicState*);
+
+private:
+    struct FontRec {
+        SkPDFFont* fFont;
+        uint32_t fFontID;
+        uint16_t fGlyphID;
+    };
+    SkTDArray<FontRec> fFontRecords;
+
+    SkTDArray<SkPDFShader*> fShaderRecords;
+
+    SkTDArray<SkPDFGraphicState*> fGraphicStateRecords;
+};
+#endif  // SkPDFCanon_DEFINED