Avoid CTFontCreateCopyWithAttributes.

It appears that CTFontCreateCopyWithAttributes and
CTFontCreateCopyWithSymbolicTraits share similar issues with the default
font on OSX10.10. CTFontCreateWithFontDescriptor cannot be used as
it will not work with webfonts. Since this is all low-level use, create the
CTFonts from the underlying CGFonts directly.

BUG=chromium:524646

Review URL: https://codereview.chromium.org/1344213004

diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index 7d90d84695f386c6ad40d55f33317e9c5bacf09f..a01c37efc058e31a264ca964f3613b48ca611fee 100644 (file)
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -282,15 +282,13 @@ static SkScalar CGToScalar(CGFloat cgFloat) {
     }
 }
 
-static CGAffineTransform MatrixToCGAffineTransform(const SkMatrix& matrix,
-                                                   SkScalar sx = SK_Scalar1,
-                                                   SkScalar sy = SK_Scalar1) {
-    return CGAffineTransformMake( ScalarToCG(matrix[SkMatrix::kMScaleX] * sx),
-                                 -ScalarToCG(matrix[SkMatrix::kMSkewY]  * sy),
-                                 -ScalarToCG(matrix[SkMatrix::kMSkewX]  * sx),
-                                  ScalarToCG(matrix[SkMatrix::kMScaleY] * sy),
-                                  ScalarToCG(matrix[SkMatrix::kMTransX] * sx),
-                                  ScalarToCG(matrix[SkMatrix::kMTransY] * sy));
+static CGAffineTransform MatrixToCGAffineTransform(const SkMatrix& matrix) {
+    return CGAffineTransformMake( ScalarToCG(matrix[SkMatrix::kMScaleX]),
+                                 -ScalarToCG(matrix[SkMatrix::kMSkewY]),
+                                 -ScalarToCG(matrix[SkMatrix::kMSkewX]),
+                                  ScalarToCG(matrix[SkMatrix::kMScaleY]),
+                                  ScalarToCG(matrix[SkMatrix::kMTransX]),
+                                  ScalarToCG(matrix[SkMatrix::kMTransY]));
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -714,6 +712,57 @@ private:
     typedef SkScalerContext INHERITED;
 };
 
+// CTFontCreateCopyWithAttributes or CTFontCreateCopyWithSymbolicTraits cannot be used on 10.10
+// as they appear to be buggy with respect to the default font. It is not possible to use
+// descriptors with CTFontCreateWithFontDescriptor, since that does not work with non-system
+// fonts. As a result, create the strike specific CTFonts from the underlying CGFont.
+static CTFontRef ctfont_create_exact_copy(CTFontRef baseFont, CGFloat textSize,
+                                          const CGAffineTransform* transform, bool setVertical)
+{
+    AutoCFRelease<CTFontDescriptorRef> baseDescriptor;
+    AutoCFRelease<CGFontRef> baseCGFont(CTFontCopyGraphicsFont(baseFont, &baseDescriptor));
+
+    // Make a mutable copy of baseDescriptor attributes.
+    AutoCFRelease<CFMutableDictionaryRef> newAttributes([](CTFontDescriptorRef descriptor) ->
+    CFMutableDictionaryRef {
+        if (nullptr == descriptor) {
+            return CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
+                                             &kCFTypeDictionaryKeyCallBacks,
+                                             &kCFTypeDictionaryValueCallBacks);
+        }
+        AutoCFRelease<CFDictionaryRef> attributes(CTFontDescriptorCopyAttributes(descriptor));
+        return CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, attributes);
+    }(baseDescriptor));
+
+    // Set the text size in attributes.
+    AutoCFRelease<CFNumberRef> cfTextSize(
+        CFNumberCreate(kCFAllocatorDefault, kCFNumberCGFloatType, &textSize));
+    CFDictionarySetValue(newAttributes, kCTFontSizeAttribute, cfTextSize);
+
+    // Set the transform in attributes.
+    if (nullptr == transform) {
+        CFDictionaryRemoveValue(newAttributes, kCTFontMatrixAttribute);
+    } else {
+        AutoCFRelease<CFDataRef> cfMatrixData(CFDataCreate(
+            kCFAllocatorDefault, reinterpret_cast<const UInt8*>(transform), sizeof(*transform)));
+        CFDictionarySetValue(newAttributes, kCTFontMatrixAttribute, cfMatrixData);
+    }
+
+    // Set vertical orientation to attributes if requested.
+    if (setVertical) {
+        CTFontOrientation ctOrientation = kCTFontVerticalOrientation;
+        AutoCFRelease<CFNumberRef> cfVertical(
+            CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &ctOrientation));
+        CFDictionarySetValue(newAttributes, kCTFontOrientationAttribute, cfVertical);
+    }
+
+    // Create the new CTFont from the baseCGFont.
+    AutoCFRelease<CTFontDescriptorRef> newDescriptor(
+        CTFontDescriptorCreateWithAttributes(newAttributes));
+    return CTFontCreateWithGraphicsFont(baseCGFont, textSize, transform, newDescriptor);
+
+}
+
 SkScalerContext_Mac::SkScalerContext_Mac(SkTypeface_Mac* typeface,
                                          const SkDescriptor* desc)
         : INHERITED(typeface, desc)
@@ -740,30 +789,13 @@ SkScalerContext_Mac::SkScalerContext_Mac(SkTypeface_Mac* typeface,
     fTransform = MatrixToCGAffineTransform(skTransform);
     fInvTransform = CGAffineTransformInvert(fTransform);
 
-    AutoCFRelease<CTFontDescriptorRef> ctFontDesc;
-    if (fVertical) {
-        // Setting the vertical orientation here is required for vertical metrics on some versions.
-        AutoCFRelease<CFMutableDictionaryRef> cfAttributes(CFDictionaryCreateMutable(
-                kCFAllocatorDefault, 0,
-                &kCFTypeDictionaryKeyCallBacks,
-                &kCFTypeDictionaryValueCallBacks));
-        if (cfAttributes) {
-            CTFontOrientation ctOrientation = kCTFontVerticalOrientation;
-            AutoCFRelease<CFNumberRef> cfVertical(CFNumberCreate(
-                    kCFAllocatorDefault, kCFNumberSInt32Type, &ctOrientation));
-            CFDictionaryAddValue(cfAttributes, kCTFontOrientationAttribute, cfVertical);
-            ctFontDesc.reset(CTFontDescriptorCreateWithAttributes(cfAttributes));
-        }
-    }
-
     // The transform contains everything except the requested text size.
     // Some properties, like 'trak', are based on the text size (before applying the matrix).
     CGFloat textSize = ScalarToCG(scale.y());
 
-    fCTFont.reset(CTFontCreateCopyWithAttributes(ctFont, textSize, &fTransform, ctFontDesc));
+    fCTFont.reset(ctfont_create_exact_copy(ctFont, textSize, &fTransform, fVertical));
     fCGFont.reset(CTFontCopyGraphicsFont(fCTFont, nullptr));
-    fCTUnrotatedFont.reset(CTFontCreateCopyWithAttributes(ctFont, textSize,
-                                                          &CGAffineTransformIdentity, nullptr));
+    fCTUnrotatedFont.reset(ctfont_create_exact_copy(ctFont, textSize, nullptr, false));
 
     // The fUnitMatrix includes the text size (and em) as it is used to scale the raw font data.
     SkScalar emPerFUnit = SkScalarInvert(SkIntToScalar(CGFontGetUnitsPerEm(fCGFont)));
@@ -1363,9 +1395,13 @@ void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path) {
                 break;
         }
 
-        CGAffineTransform xform = MatrixToCGAffineTransform(m, scaleX, scaleY);
-        // need to release font when we're done
-        font = CTFontCreateCopyWithAttributes(fCTFont, 1, &xform, nullptr);
+        CGFloat textSize = CTFontGetSize(fCTFont);
+        CGAffineTransform baseTransform = CTFontGetMatrix(fCTFont);
+        CGAffineTransform newTransform =
+            CGAffineTransformScale(baseTransform, ScalarToCG(scaleX), ScalarToCG(scaleY));
+
+        // need to release this font when we're done
+        font = ctfont_create_exact_copy(fCTFont, textSize, &newTransform, false);
     }
 
     CGGlyph cgGlyph = (CGGlyph)glyph.getGlyphID();
@@ -1380,7 +1416,7 @@ void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path) {
         SkMatrix m;
         m.setScale(SkScalarInvert(scaleX), SkScalarInvert(scaleY));
         path->transform(m);
-        // balance the call to CTFontCreateCopyWithAttributes
+        // balance the call to ctfont_create_exact_copy
         CFSafeRelease(font);
     }
     if (fVertical) {
@@ -1561,8 +1597,9 @@ SkAdvancedTypefaceMetrics* SkTypeface_Mac::onGetAdvancedTypefaceMetrics(
     AUTO_CG_LOCK();
 
     CTFontRef originalCTFont = fFontRef.get();
-    AutoCFRelease<CTFontRef> ctFont(CTFontCreateCopyWithAttributes(
-            originalCTFont, CTFontGetUnitsPerEm(originalCTFont), nullptr, nullptr));
+    AutoCFRelease<CTFontRef> ctFont(ctfont_create_exact_copy(
+            originalCTFont, CTFontGetUnitsPerEm(originalCTFont), nullptr, false));
+
     SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics;
 
     {