TextBlob: Start caching a text blob per InlineTextBox.

Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp

 /*
  * Copyright (c) 2007, 2008, 2010 Google Inc. All rights reserved.
  *
  * 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
@@ skipping 13 matching lines @@
  * 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 "config.h"
 #include "platform/fonts/Font.h"
 
-#include "platform/NotImplemented.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/fonts/FontPlatformFeatures.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/fonts/harfbuzz/HarfBuzzShaper.h"
 #include "platform/fonts/GlyphBuffer.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/GraphicsContext.h"
 
 #include "SkPaint.h"
 #include "SkTemplates.h"
 
@@ skipping 149 matching lines @@
         x += SkFloatToScalar(adv[i].width());
         y += SkFloatToScalar(adv[i].height());
     }
 
     const Glyph* glyphs = glyphBuffer.glyphs(from);
     paintGlyphs(gc, font, glyphs, numGlyphs, pos, textRect);
 }
 
 void Font::drawTextBlob(GraphicsContext* gc, const SkTextBlob* blob, const SkPoint& origin) const
 {
+    ASSERT(RuntimeEnabledFeatures::textBlobEnabled());
+
     // FIXME: It would be good to move this to Font.cpp, if we're sure that none
     // of the things in FontMac's setupPaint need to apply here.
     // See also paintGlyphs.
     TextDrawingModeFlags textMode = gc->textDrawingMode();
 
     if (textMode & TextModeFill)
         gc->drawTextBlob(blob, origin, gc->fillPaint());
 
     if ((textMode & TextModeStroke) && gc->hasStroke()) {
         SkPaint paint = gc->strokePaint();
@@ skipping 75 matching lines @@
 {
     HarfBuzzShaper shaper(this, run);
     if (!shaper.shape())
         return FloatRect();
     return shaper.selectionRect(point, height, from, to);
 }
 
 PassTextBlobPtr Font::buildTextBlob(const GlyphBuffer& glyphBuffer, float initialAdvance,
     const FloatRect& bounds, float& advance, bool couldUseLCD) const
 {
+    ASSERT(RuntimeEnabledFeatures::textBlobEnabled());
+
     // FIXME: Except for setupPaint, this is not specific to FontHarfBuzz.
     // FIXME: Also implement the more general full-positioning path.
     ASSERT(!glyphBuffer.hasVerticalAdvances());
 
     SkTextBlobBuilder builder;
     SkScalar x = SkFloatToScalar(initialAdvance);
     SkRect skBounds = bounds;
 
     unsigned i = 0;
     while (i < glyphBuffer.size()) {
@@ skipping 32 matching lines @@
             buffer.pos[j] = x;
             x += SkFloatToScalar(advances[j].width());
         }
     }
 
     advance = x;
     return adoptRef(builder.build());
 }
 
 } // namespace blink