1 files changed, 67 insertions, 0 deletions
diff --git a/cc/font_atlas.h b/cc/font_atlas.h
index 638cbb2..2881ee9 100644
--- a/cc/font_atlas.h
+++ b/cc/font_atlas.h
@@ -1,3 +1,70 @@
 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
+#ifndef CCFontAtlas_h
+#define CCFontAtlas_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "IntRect.h"
+#include "SkBitmap.h"
+
+class SkCanvas;
+
+namespace gfx {
+class Point;
+}
+
+namespace cc {
+
+class Color;
+class FontDescription;
+class GraphicsContext;
+class IntSize;
+
+// This class provides basic ability to draw text onto the heads-up display.
+class CCFontAtlas {
+public:
+    static scoped_ptr<CCFontAtlas> create(SkBitmap bitmap, IntRect asciiToRectTable[128], int fontHeight)
+    {
+        return make_scoped_ptr(new CCFontAtlas(bitmap, asciiToRectTable, fontHeight));
+    }
+    ~CCFontAtlas();
+
+    // Draws multiple lines of text where each line of text is separated by '\n'.
+    // - Correct glyphs will be drawn for ASCII codes in the range 32-127; any characters
+    //   outside that range will be displayed as a default rectangle glyph.
+    // - IntSize clip is used to avoid wasting time drawing things that are outside the
+    //   target canvas bounds.
+    // - Should only be called only on the impl thread.
+    void drawText(SkCanvas*, const SkPaint&, const std::string& text, const gfx::Point& destPosition, const IntSize& clip) const;
+
+    // Draws the entire atlas at the specified position, just for debugging purposes.
+    void drawDebugAtlas(SkCanvas*, const gfx::Point& destPosition) const;
+
+private:
+    CCFontAtlas(SkBitmap, IntRect asciiToRectTable[128], int fontHeight);
+
+    void drawOneLineOfTextInternal(SkCanvas*, const SkPaint&, const std::string&, const gfx::Point& destPosition) const;
+
+    // The actual texture atlas containing all the pre-rendered glyphs.
+    SkBitmap m_atlas;
+
+    // The look-up tables mapping ascii characters to their IntRect locations on the atlas.
+    IntRect m_asciiToRectTable[128];
+
+    int m_fontHeight;
+
+    DISALLOW_COPY_AND_ASSIGN(CCFontAtlas);
+};
+
+}  // namespace cc
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif