Fix SkTextBlob offset semantics.

src/core/SkDraw.cpp

 /*
  * Copyright 2006 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 "SkDraw.h"
 #include "SkBlitter.h"
 #include "SkCanvas.h"
@@ skipping 1637 matching lines @@
         }
 
         fx += glyph.fAdvanceX;
         fy += glyph.fAdvanceY;
     }
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 void SkDraw::drawPosText_asPaths(const char text[], size_t byteLength,
-                                 const SkScalar pos[], SkScalar constY,
-                                 int scalarsPerPosition,
-                                 const SkPaint& origPaint) const {
+                                 const SkScalar pos[], int scalarsPerPosition,
+                                 const SkPoint& offset, const SkPaint& origPaint) const {
     // setup our std paint, in hopes of getting hits in the cache
     SkPaint paint(origPaint);
     SkScalar matrixScale = paint.setupForAsPaths();
 
     SkMatrix matrix;
     matrix.setScale(matrixScale, matrixScale);
 
     // Temporarily jam in kFill, so we only ever ask for the raw outline from the cache.
     paint.setStyle(SkPaint::kFill_Style);
     paint.setPathEffect(NULL);
 
     SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
     SkAutoGlyphCache    autoCache(paint, NULL, NULL);
     SkGlyphCache*       cache = autoCache.getCache();
 
     const char*        stop = text + byteLength;
     SkTextAlignProcScalar alignProc(paint.getTextAlign());
-    SkTextMapStateProc tmsProc(SkMatrix::I(), constY, scalarsPerPosition);
+    SkTextMapStateProc tmsProc(SkMatrix::I(), offset, scalarsPerPosition);
 
     // Now restore the original settings, so we "draw" with whatever style/stroking.
     paint.setStyle(origPaint.getStyle());
     paint.setPathEffect(origPaint.getPathEffect());
 
     while (text < stop) {
         const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
         if (glyph.fWidth) {
             const SkPath* path = cache->findPath(glyph);
             if (path) {
                 SkPoint tmsLoc;
                 tmsProc(pos, &tmsLoc);
                 SkPoint loc;
                 alignProc(tmsLoc, glyph, &loc);
 
                 matrix[SkMatrix::kMTransX] = loc.fX;
                 matrix[SkMatrix::kMTransY] = loc.fY;
                 if (fDevice) {
                     fDevice->drawPath(*this, *path, paint, &matrix, false);
                 } else {
                     this->drawPath(*path, paint, &matrix, false);
                 }
             }
         }
         pos += scalarsPerPosition;
     }
 }
 
 void SkDraw::drawPosText(const char text[], size_t byteLength,
-                         const SkScalar pos[], SkScalar constY,
-                         int scalarsPerPosition, const SkPaint& paint) const {
+                         const SkScalar pos[], int scalarsPerPosition,
+                         const SkPoint& offset, const SkPaint& paint) const {
     SkASSERT(byteLength == 0 || text != NULL);
     SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
 
     SkDEBUGCODE(this->validate();)
 
     // nothing to draw
     if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
         return;
     }
 
     if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
-        this->drawPosText_asPaths(text, byteLength, pos, constY,
-                                  scalarsPerPosition, paint);
+        this->drawPosText_asPaths(text, byteLength, pos, scalarsPerPosition, offset, paint);
         return;
     }
 
     SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
     SkAutoGlyphCache    autoCache(paint, &fDevice->getLeakyProperties(), fMatrix);
     SkGlyphCache*       cache = autoCache.getCache();
 
     SkAAClipBlitterWrapper wrapper;
     SkAutoBlitterChoose blitterChooser;
     SkBlitter* blitter = NULL;
     if (needsRasterTextBlit(*this)) {
         blitterChooser.choose(*fBitmap, *fMatrix, paint);
         blitter = blitterChooser.get();
         if (fRC->isAA()) {
             wrapper.init(*fRC, blitter);
             blitter = wrapper.getBlitter();
         }
     }
 
     const char*        stop = text + byteLength;
     SkTextAlignProc    alignProc(paint.getTextAlign());
     SkDraw1Glyph       d1g;
     SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache, paint);
-    SkTextMapStateProc tmsProc(*fMatrix, constY, scalarsPerPosition);
+    SkTextMapStateProc tmsProc(*fMatrix, offset, scalarsPerPosition);
 
     if (cache->isSubpixel()) {
         // maybe we should skip the rounding if linearText is set
         SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);
 
         SkFixed fxMask = ~0;
         SkFixed fyMask = ~0;
         if (kX_SkAxisAlignment == baseline) {
             fyMask = 0;
 #ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
@@ skipping 621 matching lines @@
         mask->fImage = SkMask::AllocImage(size);
         memset(mask->fImage, 0, mask->computeImageSize());
     }
 
     if (SkMask::kJustComputeBounds_CreateMode != mode) {
         draw_into_mask(*mask, devPath, style);
     }
 
     return true;
 }