Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 139 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/FontFallbackList.cpp b/Source/WebCore/platform/graphics/FontFallbackList.cpp
new file mode 100644
index 0000000..649c117
--- /dev/null
+++ b/Source/WebCore/platform/graphics/FontFallbackList.cpp
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2006 Apple Computer, 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:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer. 
+ * 2.  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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.
+ */
+
+#include "config.h"
+#include "FontFallbackList.h"
+
+#include "Font.h"
+#include "FontCache.h"
+#include "SegmentedFontData.h"
+
+namespace WebCore {
+
+FontFallbackList::FontFallbackList()
+    : m_pageZero(0)
+    , m_cachedPrimarySimpleFontData(0)
+    , m_fontSelector(0)
+    , m_familyIndex(0)
+    , m_pitch(UnknownPitch)
+    , m_loadingCustomFonts(false)
+    , m_generation(fontCache()->generation())
+{
+}
+
+void FontFallbackList::invalidate(PassRefPtr<FontSelector> fontSelector)
+{
+    releaseFontData();
+    m_fontList.clear();
+    m_pageZero = 0;
+    m_pages.clear();
+    m_cachedPrimarySimpleFontData = 0;
+    m_familyIndex = 0;    
+    m_pitch = UnknownPitch;
+    m_loadingCustomFonts = false;
+    m_fontSelector = fontSelector;
+    m_generation = fontCache()->generation();
+}
+
+void FontFallbackList::releaseFontData()
+{
+    unsigned numFonts = m_fontList.size();
+    for (unsigned i = 0; i < numFonts; ++i) {
+        if (!m_fontList[i].second) {
+            ASSERT(!m_fontList[i].first->isSegmented());
+            fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fontList[i].first));
+        }
+    }
+}
+
+void FontFallbackList::determinePitch(const Font* font) const
+{
+    const FontData* fontData = primaryFontData(font);
+    if (!fontData->isSegmented())
+        m_pitch = static_cast<const SimpleFontData*>(fontData)->pitch();
+    else {
+        const SegmentedFontData* segmentedFontData = static_cast<const SegmentedFontData*>(fontData);
+        unsigned numRanges = segmentedFontData->numRanges();
+        if (numRanges == 1)
+            m_pitch = segmentedFontData->rangeAt(0).fontData()->pitch();
+        else
+            m_pitch = VariablePitch;
+    }
+}
+
+const FontData* FontFallbackList::fontDataAt(const Font* font, unsigned realizedFontIndex) const
+{
+    if (realizedFontIndex < m_fontList.size())
+        return m_fontList[realizedFontIndex].first; // This fallback font is already in our list.
+
+    // Make sure we're not passing in some crazy value here.
+    ASSERT(realizedFontIndex == m_fontList.size());
+
+    if (m_familyIndex == cAllFamiliesScanned)
+        return 0;
+
+    // Ask the font cache for the font data.
+    // We are obtaining this font for the first time.  We keep track of the families we've looked at before
+    // in |m_familyIndex|, so that we never scan the same spot in the list twice.  getFontData will adjust our
+    // |m_familyIndex| as it scans for the right font to make.
+    ASSERT(fontCache()->generation() == m_generation);
+    const FontData* result = fontCache()->getFontData(*font, m_familyIndex, m_fontSelector.get());
+    if (result) {
+        m_fontList.append(pair<const FontData*, bool>(result, result->isCustomFont()));
+        if (result->isLoading())
+            m_loadingCustomFonts = true;
+    }
+    return result;
+}
+
+const FontData* FontFallbackList::fontDataForCharacters(const Font* font, const UChar* characters, int length) const
+{
+    // This method is only called when the primary font does not contain the characters we need.
+    // Begin our search at position 1.
+    unsigned realizedFontIndex = 1;
+    const FontData* fontData = fontDataAt(font, realizedFontIndex);
+    while (fontData && !fontData->containsCharacters(characters, length))
+        fontData = fontDataAt(font, ++realizedFontIndex);
+    
+    if (!fontData) {
+        ASSERT(fontCache()->generation() == m_generation);
+        fontData = fontCache()->getFontDataForCharacters(*font, characters, length);
+    }
+
+    return fontData;
+}
+
+void FontFallbackList::setPlatformFont(const FontPlatformData& platformData)
+{
+    m_familyIndex = cAllFamiliesScanned;
+    ASSERT(fontCache()->generation() == m_generation);
+    const FontData* fontData = fontCache()->getCachedFontData(&platformData);
+    m_fontList.append(pair<const FontData*, bool>(fontData, fontData->isCustomFont()));
+}
+
+}