1 files changed, 115 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/svg/SVGTextMetrics.cpp b/Source/WebCore/rendering/svg/SVGTextMetrics.cpp
new file mode 100644
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+++ b/Source/WebCore/rendering/svg/SVGTextMetrics.cpp
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+/*
+ * Copyright (C) Research In Motion Limited 2010. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+
+#if ENABLE(SVG)
+#include "SVGTextMetrics.h"
+
+#include "RenderSVGInlineText.h"
+
+namespace WebCore {
+
+SVGTextMetrics::SVGTextMetrics()
+    : m_width(0)
+    , m_height(0)
+    , m_length(0)
+{
+}
+
+SVGTextMetrics::SVGTextMetrics(const Font& font, const TextRun& run, unsigned position, unsigned textLength)
+    : m_width(0)
+    , m_height(0)
+    , m_length(0)
+{
+    int extraCharsAvailable = textLength - (position + run.length());
+    int length = 0;
+
+    m_width = font.floatWidth(run, extraCharsAvailable, length, m_glyph.name);
+    m_height = font.height();
+    m_glyph.unicodeString = String(run.characters(), length);
+    m_glyph.isValid = true;
+
+    ASSERT(length >= 0);
+    m_length = static_cast<unsigned>(length);
+}
+
+bool SVGTextMetrics::operator==(const SVGTextMetrics& other)
+{
+    return m_width == other.m_width
+        && m_height == other.m_height
+        && m_length == other.m_length
+        && m_glyph == other.m_glyph;
+}
+
+SVGTextMetrics SVGTextMetrics::emptyMetrics()
+{
+    DEFINE_STATIC_LOCAL(SVGTextMetrics, s_emptyMetrics, ());
+    s_emptyMetrics.m_length = 1;
+    return s_emptyMetrics;
+}
+
+static TextRun constructTextRun(RenderSVGInlineText* text, const UChar* characters, unsigned position, unsigned length)
+{
+    TextRun run(characters + position, length);
+
+#if ENABLE(SVG_FONTS)
+    ASSERT(text->parent());
+    run.setReferencingRenderObject(text->parent());
+#endif
+
+    // Disable any word/character rounding.
+    run.disableRoundingHacks();
+
+    // We handle letter & word spacing ourselves.
+    run.disableSpacing();
+    return run;
+}
+
+SVGTextMetrics SVGTextMetrics::measureCharacterRange(RenderSVGInlineText* text, unsigned position, unsigned length)
+{
+    ASSERT(text);
+    ASSERT(text->style());
+
+    TextRun run(constructTextRun(text, text->characters(), position, length));
+    return SVGTextMetrics(text->style()->font(), run, position, text->textLength());
+}
+
+void SVGTextMetrics::measureAllCharactersIndividually(RenderSVGInlineText* text, Vector<SVGTextMetrics>& allMetrics)
+{
+    ASSERT(text);
+    ASSERT(text->style());
+
+    const Font& font = text->style()->font();
+    const UChar* characters = text->characters();
+    unsigned length = text->textLength();
+
+    TextRun run(constructTextRun(text, 0, 0, 0));
+    for (unsigned position = 0; position < length; ) {
+        run.setText(characters + position, 1);
+
+        SVGTextMetrics metrics(font, run, position, text->textLength());
+        allMetrics.append(metrics);
+        position += metrics.length();
+    }
+}
+
+}
+
+#endif // ENABLE(SVG)