Fallback handle if vertical glyphs are missing.

Bug 5094208 : browser VerticalWritingMode support.
Some punctuation has to change its glyph in vertical writing mode.
For example, dash in vertical text is a vertical bar. In
current Android system fonts and fallback fonts, none of them have the
substitute tables for vertical writing mode.  We call a conversion
function that converts the punctuation to the Unicode Vertical Form
(0xFE10 - 0xFE19) or to the closest glyphs as alternative when
vertical substitute tables are absent in fonts. Otherwise, we use
Harfbuzz to do the vertical glyph shapping.

Change-Id: If1d31bb72aaaba45ed50bbb75d6246cfa30e3428

1 files changed, 104 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/android/VerticalTextMap.cpp b/Source/WebCore/platform/graphics/android/VerticalTextMap.cpp
new file mode 100644
index 0000000..2bb008f
--- /dev/null
+++ b/Source/WebCore/platform/graphics/android/VerticalTextMap.cpp
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2011, The Android Open Source Project
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include "VerticalTextMap.h"
+
+#include <wtf/Forward.h>
+#include <wtf/MessageQueue.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+
+static const UChar vTextCnvTable[][2] = {
+    // TODO: uncomment mappings once we add glyphs for vertical forms.
+    // {0x0021, 0xfe15},  // exclamation mark
+    {0x0028, 0xfe35},  // left paren
+    {0x0029, 0xfe36},  // right paren
+    // {0x002c, 0xfe10},  // comma
+    {0x003a, 0xfe30},  // colon
+    {0x003b, 0x007c},  // hyphen
+    // {0x003f, 0xfe16},  // question mark
+    // {0x005b, 0xfe14},  // semicolon
+    {0x005d, 0xfe47},  // left square bracket
+    {0x005f, 0xfe48},  // right square bracket
+    {0x007b, 0xfe37},  // left curly bracket
+    {0x007d, 0xfe38},  // right curly bracket
+    {0x007e, 0x007c},  // tilde to vertical line
+    {0x2013, 0xfe32},  // en dash
+    {0x2014, 0xfe31},  // em dash
+    {0x2015, 0xfe31},  // horizontal bar
+    {0x2025, 0xfe30},  // two dot leader
+    // TODO: change the mapping 0x2026 -> 0xFE19 once Android has the glyph for 0xFE19.
+    {0x2026, 0xfe30},  // three dot leader
+    // {0x3001, 0xfe11},  // Ideographic comma
+    // {0x3002, 0xfe12},  // Ideographic full stop
+    {0x3008, 0xfe3f},  // left angle bracket
+    {0x3009, 0xfe40},  // right angle bracket
+    {0x300a, 0xfe3d},  // left double angle bracket
+    {0x300b, 0xfe3e},  // right double angle bracket
+    {0x300c, 0xfe41},  // left corner bracket
+    {0x300d, 0xfe42},  // right corner bracket
+    {0x300e, 0xfe43},  // left white corner bracket
+    {0x300f, 0xfe44},  // right white corner bracket
+    {0x3010, 0xfe3b},  // left black lenticular bracket
+    {0x3011, 0xfe3c},  // right black lenticular bracket
+    {0x3014, 0xfe39},  // left black lenticular bracket
+    {0x3015, 0xfe3a},  // right tortise shell bracket
+    // {0x3016, 0xfe17},  // left white lenticular bracket
+    // {0x3017, 0xfe18},  // right white lenticular bracket
+    // {0x3019, 0xfe19},  // horizontal ellipses
+    {0x30fc, 0x3021},  // prolonged sound
+    {0xfe4f, 0xfe34},  // wavy low line
+    {0xff08, 0xfe35},  // full width left paren
+    {0xff09, 0xfe36},  // full width right paren
+    {0xff3b, 0xfe47},  // full width left square bracket
+    {0xff3d, 0xfe48},  // full width right square bracket
+    {0xff5b, 0xfe37},  // full width left curly bracket
+    {0xff5d, 0xfe38},  // full width right curly bracket
+    // {0xff64, 0xfe11},  // halfwidth ideo comma
+    // {0xff61, 0xfe12},  // halfwidth ideo full stop
+};
+
+using namespace android;
+
+namespace WebCore {
+
+static WTF::Mutex m_verticalTextHashMapMutex;
+static HashMap<UChar, UChar>* verticalTextHashMap = 0;
+
+UChar VerticalTextMap::getVerticalForm(UChar c) {
+    {
+        MutexLocker lock(m_verticalTextHashMapMutex);
+        if (!verticalTextHashMap) {
+            // Lazy initialization.
+            verticalTextHashMap = new HashMap<UChar, UChar>;
+            for (size_t i = 0; i < WTF_ARRAY_LENGTH(vTextCnvTable); ++i)
+               verticalTextHashMap->set(vTextCnvTable[i][0], vTextCnvTable[i][1]);
+        }
+    }
+    return verticalTextHashMap->get(c);
+}
+
+}