Fix SkTextBlob offset semantics.

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkCanvasPriv.h"
 #include "SkBitmapDevice.h"
@@ skipping 2122 matching lines @@
         iter.fDevice->drawText(iter, text, byteLength, x, y, dfp.paint());
         DrawTextDecorations(iter, dfp.paint(),
                             static_cast<const char*>(text), byteLength, x, y);
     }
 
     LOOPER_END
 }
 
 void SkCanvas::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
                              const SkPaint& paint) {
+    SkPoint textOffset = SkPoint::Make(0, 0);
+
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
     while (iter.next()) {
         SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint());
-        iter.fDevice->drawPosText(iter, text, byteLength, &pos->fX, 0, 2,
+        iter.fDevice->drawPosText(iter, text, byteLength, &pos->fX, 2, textOffset,
                                   dfp.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
                               SkScalar constY, const SkPaint& paint) {
+
+    SkPoint textOffset = SkPoint::Make(0, constY);
+
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
     while (iter.next()) {
         SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint());
-        iter.fDevice->drawPosText(iter, text, byteLength, xpos, constY, 1,
+        iter.fDevice->drawPosText(iter, text, byteLength, xpos, 1, textOffset,
                                   dfp.paint());
     }
 
     LOOPER_END
 }
 
 void SkCanvas::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                 const SkMatrix* matrix, const SkPaint& paint) {
     LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL)
 
@@ skipping 365 matching lines @@
     }
 
     if (matrix) {
         canvas->concat(*matrix);
     }
 }
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }