Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 96 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/chromium/UniscribeHelperTextRun.h b/Source/WebCore/platform/graphics/chromium/UniscribeHelperTextRun.h
new file mode 100644
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+++ b/Source/WebCore/platform/graphics/chromium/UniscribeHelperTextRun.h
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+/*
+ * Copyright (c) 2006, 2007, 2008, 2009, Google Inc. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UniscribeHelperTextRun_h
+#define UniscribeHelperTextRun_h
+
+#include "UniscribeHelper.h"
+
+namespace WebCore {
+
+class Font;
+class TextRun;
+
+// Wrapper around the Uniscribe helper that automatically sets it up with the
+// WebKit types we supply.
+class UniscribeHelperTextRun : public UniscribeHelper {
+public:
+    // Regular constructor used for WebCore text run processing.
+    UniscribeHelperTextRun(const TextRun&, const Font&);
+
+    // Constructor with the same interface as the gfx::UniscribeState. Using
+    // this constructor will not give you font fallback, but it will provide
+    // the ability to load fonts that may not be in the OS cache
+    // ("TryToPreloadFont") if the caller does not have a TextRun/Font.
+    UniscribeHelperTextRun(const wchar_t* input,
+                           int inputLength,
+                           bool isRtl,
+                           HFONT hfont,
+                           SCRIPT_CACHE*,
+                           SCRIPT_FONTPROPERTIES*);
+
+protected:
+    virtual void tryToPreloadFont(HFONT);
+
+private:
+    // This function retrieves the Windows font data (HFONT, etc) for the next
+    // WebKit font in the list. If the font data corresponding to font_index_
+    // has been obtained before, returns the values stored in our internal
+    // vectors (hfonts_, etc).  Otherwise, it gets next SimpleFontData from
+    // WebKit and adds them to in hfonts_ and friends so that font data can be
+    // returned quickly next time they're requested.
+    virtual bool nextWinFontData(HFONT*, SCRIPT_CACHE**, SCRIPT_FONTPROPERTIES**, int* ascent);
+    virtual void resetFontIndex();
+
+    // Reference to WebKit::Font that contains all the information about fonts
+    // we can use to render this input run of text.  It is used in
+    // NextWinFontData to retrieve Windows font data for a series of
+    // non-primary fonts.
+    //
+    // This pointer can be NULL for no font fallback handling.
+    const Font* m_font;
+
+    // It's rare that many fonts are listed in stylesheets.
+    // Four would be large enough in most cases.
+    const static size_t kNumberOfFonts = 4;
+
+    // These vectors are used to store Windows font data for non-primary fonts.
+    Vector<HFONT, kNumberOfFonts> m_hfonts;
+    Vector<SCRIPT_CACHE*, kNumberOfFonts> m_scriptCaches;
+    Vector<SCRIPT_FONTPROPERTIES*, kNumberOfFonts> m_fontProperties;
+    Vector<int, kNumberOfFonts> m_ascents;
+
+    // Index of the fallback font we're currently using for NextWinFontData.
+    int m_fontIndex;
+};
+
+}  // namespace WebCore
+
+#endif  // UniscribeHelperTextRun_h