From 2bde8e466a4451c7319e3a072d118917957d6554 Mon Sep 17 00:00:00 2001
From: Steve Block <steveblock@google.com>
Date: Wed, 25 May 2011 19:08:45 +0100
Subject: Merge WebKit at r82507: Initial merge by git

Change-Id: I60ce9d780725b58b45e54165733a8ffee23b683e
---
 .../platform/graphics/mac/SimpleFontDataMac.mm     | 56 ++++++----------------
 1 file changed, 15 insertions(+), 41 deletions(-)

(limited to 'Source/WebCore/platform/graphics/mac/SimpleFontDataMac.mm')

diff --git a/Source/WebCore/platform/graphics/mac/SimpleFontDataMac.mm b/Source/WebCore/platform/graphics/mac/SimpleFontDataMac.mm
index 3094498..cd34000 100644
--- a/Source/WebCore/platform/graphics/mac/SimpleFontDataMac.mm
+++ b/Source/WebCore/platform/graphics/mac/SimpleFontDataMac.mm
@@ -259,49 +259,32 @@ void SimpleFontData::platformInit()
         descent = 3;
     }
     
-    if (m_orientation == Vertical) {
-        // Ignore vertical orientation when the font doesn't support vertical metrics.
+    if (platformData().orientation() == Vertical && !isTextOrientationFallback()) {
         // The check doesn't look neat but this is what AppKit does for vertical writing...
         RetainPtr<CFArrayRef> tableTags(AdoptCF, CTFontCopyAvailableTables(m_platformData.ctFont(), kCTFontTableOptionExcludeSynthetic));
         CFIndex numTables = CFArrayGetCount(tableTags.get());
-        bool found = false;
         for (CFIndex index = 0; index < numTables; ++index) {
             CTFontTableTag tag = (CTFontTableTag)(uintptr_t)CFArrayGetValueAtIndex(tableTags.get(), index);
             if (tag == kCTFontTableVhea || tag == kCTFontTableVORG) {
-                found = true;
+                m_hasVerticalGlyphs = true;
                 break;
             }
         }
-
-        if (found == false)
-            m_orientation = Horizontal;
     }
 
     float xHeight;
 
-    // Measure the actual character "x", because AppKit synthesizes X height rather than getting it from the font.
-    // Unfortunately, NSFont will round this for us so we don't quite get the right value.
-    GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
-    NSGlyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0;
-    if (xGlyph) {
-        CGRect xBox = platformBoundsForGlyph(xGlyph);
-        // Use the maximum of either width or height because "x" is nearly square
-        // and web pages that foolishly use this metric for width will be laid out
-        // poorly if we return an accurate height. Classic case is Times 13 point,
-        // which has an "x" that is 7x6 pixels.
-        xHeight = static_cast<float>(max(CGRectGetMaxX(xBox), -CGRectGetMinY(xBox)));
-    } else {
-#ifndef BUILDING_ON_TIGER
-        xHeight = static_cast<float>(CGFontGetXHeight(m_platformData.cgFont())) / unitsPerEm;
-#else
-        xHeight = m_platformData.font() ? [m_platformData.font() xHeight] : 0;
-#endif
-        // CGFontGetXHeight() returns a wrong value for "Apple Symbols" font (a float close to 0, but not strictly 0).
-        // The following code makes a guess for xHeight in that case.
-        // The int cast is a workaround for the "almost" zero value returned by CGFontGetXHeight().
-        if (!static_cast<int>(xHeight) && ascent)
-            xHeight = 2 * ascent / 3;
-    }
+    if (platformData().orientation() == Horizontal) {
+        // Measure the actual character "x", since it's possible for it to extend below the baseline, and we need the
+        // reported x-height to only include the portion of the glyph that is above the baseline.
+        GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
+        NSGlyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0;
+        if (xGlyph)
+            xHeight = -CGRectGetMinY(platformBoundsForGlyph(xGlyph));
+        else
+            xHeight = scaleEmToUnits(CGFontGetXHeight(m_platformData.cgFont()), unitsPerEm) * pointSize;
+    } else
+        xHeight = verticalRightOrientationFontData()->fontMetrics().xHeight();
 
     m_fontMetrics.setUnitsPerEm(unitsPerEm);
     m_fontMetrics.setAscent(ascent);
@@ -474,17 +457,8 @@ void SimpleFontData::determinePitch()
 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
 {
     FloatRect boundingBox;
-#ifndef BUILDING_ON_TIGER
-    boundingBox = CTFontGetBoundingRectsForGlyphs(m_platformData.ctFont(),
-                    orientation() == Vertical ? kCTFontVerticalOrientation : kCTFontHorizontalOrientation, &glyph, 0, 1);
+    boundingBox = CTFontGetBoundingRectsForGlyphs(m_platformData.ctFont(), platformData().orientation() == Vertical ? kCTFontVerticalOrientation : kCTFontHorizontalOrientation, &glyph, 0, 1);
     boundingBox.setY(-boundingBox.maxY());
-#else
-    // FIXME: Custom fonts don't have NSFonts, so this function doesn't compute correct bounds for these on Tiger.
-    if (!m_platformData.font())
-        return boundingBox;
-    boundingBox = [m_platformData.font() boundingRectForGlyph:glyph];
-    boundingBox.setY(-boundingBox.maxY());
-#endif
     if (m_syntheticBoldOffset)
         boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
 
@@ -494,7 +468,7 @@ FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
 {
     CGSize advance;
-    if (orientation() == Horizontal || m_isBrokenIdeographFont) {
+    if (platformData().orientation() == Horizontal || m_isBrokenIdeographFallback) {
         NSFont* font = platformData().font();
         float pointSize = platformData().m_size;
         CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
-- 
cgit v1.1