Expose drawTextBlob to devices.

src/core/SkDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDevice.h"
 #include "SkDraw.h"
 #include "SkMetaData.h"
 #include "SkPatchUtils.h"
+#include "SkTextBlob.h"
 
 SkBaseDevice::SkBaseDevice()
     : fLeakyProperties(SkDeviceProperties::MakeDefault())
 #ifdef SK_DEBUG
     , fAttachedToCanvas(false)
 #endif
 {
     fOrigin.setZero();
     fMetaData = NULL;
 }
@@ skipping 65 matching lines @@
 
     // It automatically adjusts lodX and lodY in case it exceeds the number of indices.
     // If it fails to generate the vertices, then we do not draw. 
     if (SkPatchUtils::getVertexData(&data, cubics, colors, texCoords, lod.width(), lod.height())) {
         this->drawVertices(draw, SkCanvas::kTriangles_VertexMode, data.fVertexCount, data.fPoints,
                            data.fTexCoords, data.fColors, xmode, data.fIndices, data.fIndexCount,
                            paint);
     }
 }
 
+void SkBaseDevice::drawTextBlob(const SkDraw& draw, const SkTextBlob* blob, SkScalar x, SkScalar y,
+                                const SkPaint &paint) {
+
+    SkMatrix localMatrix;
+    SkDraw localDraw(draw);
+
+    if (x || y) {
+        localMatrix = *draw.fMatrix;
+        localMatrix.preTranslate(x, y);
+        localDraw.fMatrix = &localMatrix;
+    }
+
+    SkPaint runPaint = paint;
+    SkTextBlob::RunIterator it(blob);
+    while (!it.done()) {
+        size_t textLen = it.glyphCount() * sizeof(uint16_t);
+        const SkPoint& offset = it.offset();
+        // applyFontToPaint() always overwrites the exact same attributes,
+        // so it is safe to not re-seed the paint.
+        it.applyFontToPaint(&runPaint);
+
+        switch (it.positioning()) {
+        case SkTextBlob::kDefault_Positioning:
+            this->drawText(localDraw, it.glyphs(), textLen, offset.x(), offset.y(), runPaint);
+            break;
+        case SkTextBlob::kHorizontal_Positioning:
+        case SkTextBlob::kFull_Positioning:
+            this->drawPosText(localDraw, it.glyphs(), textLen, it.pos(), offset.y(),
+                              SkTextBlob::ScalarsPerGlyph(it.positioning()), runPaint);
+            break;
+        default:
+            SkFAIL("unhandled positioning mode");
+        }
+
+        it.next();
+    }
+}
+
 bool SkBaseDevice::readPixels(const SkImageInfo& info, void* dstP, size_t rowBytes, int x, int y) {
 #ifdef SK_DEBUG
     SkASSERT(info.width() > 0 && info.height() > 0);
     SkASSERT(dstP);
     SkASSERT(rowBytes >= info.minRowBytes());
     SkASSERT(x >= 0 && y >= 0);
 
     const SkImageInfo& srcInfo = this->imageInfo();
     SkASSERT(x + info.width() <= srcInfo.width());
     SkASSERT(y + info.height() <= srcInfo.height());
@@ skipping 42 matching lines @@
 
 void SkBaseDevice::EXPERIMENTAL_optimize(const SkPicture* picture) {
     // The base class doesn't perform any analysis but derived classes may
 }
 
 bool SkBaseDevice::EXPERIMENTAL_drawPicture(SkCanvas*, const SkPicture*, const SkMatrix*,
                                             const SkPaint*) {
     // The base class doesn't perform any accelerated picture rendering
     return false;
 }