Add SVG Text to support the CSS 'text-orientation' property

third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngineBaseline.cpp

 /*
  * 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
@@ skipping 130 matching lines @@
         return ascent * 8 / 10.f;
     case AB_MATHEMATICAL:
         return ascent / 2;
     case AB_BASELINE:
     default:
         ASSERT_NOT_REACHED();
         return 0;
     }
 }
 
-float SVGTextLayoutEngineBaseline::calculateGlyphOrientationAngle(bool isVerticalText, const SVGComputedStyle& style, const UChar32 character) const
-{
-    switch (isVerticalText ? style.glyphOrientationVertical() : style.glyphOrientationHorizontal()) {
-    case GO_AUTO: {
-        // Spec: Fullwidth ideographic and fullwidth Latin text will be set with a glyph-orientation of 0-degrees.
-        // Text which is not fullwidth will be set with a glyph-orientation of 90-degrees.
-        if (!Character::isUprightInMixedVertical(character))
-            return 90;
-
-        return 0;
-    }
-    case GO_90DEG:
-        return 90;
-    case GO_180DEG:
-        return 180;
-    case GO_270DEG:
-        return 270;
-    case GO_0DEG:
-    default:
-        return 0;
-    }
 }
-
-static inline bool glyphOrientationIsMultiplyOf180Degrees(float orientationAngle)
-{
-    return !fabsf(fmodf(orientationAngle, 180));
-}
-
-float SVGTextLayoutEngineBaseline::calculateGlyphAdvanceAndOrientation(bool isVerticalText, const SVGTextMetrics& metrics, float angle, float& xOrientationShift, float& yOrientationShift) const
-{
-    bool orientationIsMultiplyOf180Degrees = glyphOrientationIsMultiplyOf180Degrees(angle);
-
-    // The function is based on spec requirements:
-    //
-    // Spec: If the 'glyph-orientation-horizontal' results in an orientation angle that is not a multiple of
-    // of 180 degrees, then the current text position is incremented according to the vertical metrics of the glyph.
-    //
-    // Spec: If if the 'glyph-orientation-vertical' results in an orientation angle that is not a multiple of
-    // 180 degrees, then the current text position is incremented according to the horizontal metrics of the glyph.
-
-    const FontMetrics& fontMetrics = m_font.fontMetrics();
-
-    float ascent = fontMetrics.floatAscent() / m_effectiveZoom;
-    float descent = fontMetrics.floatDescent() / m_effectiveZoom;
-
-    // Vertical orientation handling.
-    if (isVerticalText) {
-        float ascentMinusDescent = ascent - descent;
-
-        if (!angle) {
-            xOrientationShift = (ascentMinusDescent - metrics.width()) / 2;
-            yOrientationShift = ascent;
-        } else if (angle == 180) {
-            xOrientationShift = (ascentMinusDescent + metrics.width()) / 2;
-        } else if (angle == 270) {
-            yOrientationShift = metrics.width();
-            xOrientationShift = ascentMinusDescent;
-        }
-
-        // Vertical advance calculation.
-        if (angle && !orientationIsMultiplyOf180Degrees)
-            return metrics.width();
-
-        return metrics.height();
-    }
-
-    // Horizontal orientation handling.
-    if (angle == 90) {
-        yOrientationShift = -metrics.width();
-    } else if (angle == 180) {
-        xOrientationShift = metrics.width();
-        yOrientationShift = -ascent;
-    } else if (angle == 270) {
-        xOrientationShift = metrics.width();
-    }
-
-    // Horizontal advance calculation.
-    if (angle && !orientationIsMultiplyOf180Degrees)
-        return metrics.height();
-
-    return metrics.width();
-}
-
-}