Initial change to move text blob to GrTextContext

src/gpu/GrTextContext.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextContext.h"
 #include "GrContext.h"
 #include "GrDrawTarget.h"
 #include "GrFontScaler.h"
 
 #include "SkAutoKern.h"
+#include "SkDrawFilter.h"
 #include "SkDrawProcs.h"
 #include "SkGlyphCache.h"
 #include "SkGpuDevice.h"
+#include "SkTextBlob.h"
 #include "SkTextMapStateProc.h"
 #include "SkTextToPathIter.h"
 
 GrTextContext::GrTextContext(GrContext* context, SkGpuDevice* gpuDevice,
                              const SkDeviceProperties& properties)
     : fFallbackTextContext(NULL)
     , fContext(context)
     , fGpuDevice(gpuDevice)
     , fDeviceProperties(properties)
     , fDrawTarget(NULL) {
@@ skipping 57 matching lines @@
             return;
         }
         textContext = textContext->fFallbackTextContext;
     } while (textContext);
 
     // fall back to drawing as a path
     this->drawPosTextAsPath(skPaint, viewMatrix, text, byteLength, pos, scalarsPerPosition, offset,
                             clipBounds);
 }
 
+void GrTextContext::drawTextBlob(GrRenderTarget* rt, const GrClip& clip, const SkPaint& skPaint,
+                                 const SkMatrix& viewMatrix, const SkTextBlob* blob,
+                                 SkScalar x, SkScalar y,
+                                 SkDrawFilter* drawFilter, const SkIRect& clipBounds) {
+    if (!fContext->getTextTarget()) {
+        return;
+    }
+
+    GrTextContext* textContext = this;
+    do {
+        if (textContext->canDraw(skPaint, viewMatrix)) {
+            textContext->onDrawTextBlob(rt, clip, skPaint, viewMatrix, blob, x, y, drawFilter,
+                                        clipBounds);
+            return;
+        }
+        textContext = textContext->fFallbackTextContext;
+    } while (textContext);
+}
+
 void GrTextContext::drawTextAsPath(const SkPaint& skPaint, const SkMatrix& viewMatrix,
                                    const char text[], size_t byteLength, SkScalar x, SkScalar y,
                                    const SkIRect& clipBounds) {
     SkTextToPathIter iter(text, byteLength, skPaint, true);
 
     SkMatrix    matrix;
     matrix.setScale(iter.getPathScale(), iter.getPathScale());
     matrix.postTranslate(x, y);
 
     const SkPath* iterPath;
@@ skipping 48 matching lines @@
 
                 matrix[SkMatrix::kMTransX] = loc.fX;
                 matrix[SkMatrix::kMTransY] = loc.fY;
                 fGpuDevice->internalDrawPath(*path, paint, viewMatrix, &matrix, clipBounds, false);
             }
         }
         pos += scalarsPerPosition;
     }
 }
 
+void GrTextContext::onDrawTextBlob(GrRenderTarget* rt, const GrClip& clip,
+                                   const SkPaint& skPaint, const SkMatrix& viewMatrix,
+                                   const SkTextBlob* blob, SkScalar x, SkScalar y,
+                                   SkDrawFilter* drawFilter, const SkIRect& clipBounds) {
+    SkPaint runPaint = skPaint;
+
+    SkTextBlob::RunIterator it(blob);
+    for (;!it.done(); it.next()) {
+        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 for this reason.
+        it.applyFontToPaint(&runPaint);
+
+        if (drawFilter && !drawFilter->filter(&runPaint, SkDrawFilter::kText_Type)) {
+            // A false return from filter() means we should abort the current draw.
+            runPaint = skPaint;
+            continue;
+        }
+
+        runPaint.setFlags(fGpuDevice->filterTextFlags(runPaint));
+
+        GrPaint grPaint;
+        SkPaint2GrPaintShader(fContext, fRenderTarget, runPaint, viewMatrix, true, &grPaint);
+
+        switch (it.positioning()) {
+        case SkTextBlob::kDefault_Positioning:
+            this->drawText(rt, clip, grPaint, runPaint, viewMatrix, (const char *)it.glyphs(),
+                           textLen, x + offset.x(), y + offset.y(), clipBounds);
+            break;
+        case SkTextBlob::kHorizontal_Positioning:
+            this->drawPosText(rt, clip, grPaint, runPaint, viewMatrix, (const char*)it.glyphs(),
+                              textLen, it.pos(), 1, SkPoint::Make(x, y + offset.y()), clipBounds);
+            break;
+        case SkTextBlob::kFull_Positioning:
+            this->drawPosText(rt, clip, grPaint, runPaint, viewMatrix, (const char*)it.glyphs(),
+                              textLen, it.pos(), 2, SkPoint::Make(x, y), clipBounds);
+            break;
+        default:
+            SkFAIL("unhandled positioning mode");
+        }
+
+        if (drawFilter) {
+            // A draw filter may change the paint arbitrarily, so we must re-seed in this case.
+            runPaint = skPaint;
+        }
+    }
+}
+
 //*** change to output positions?
 int GrTextContext::MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
                                 const char text[], size_t byteLength, SkVector* stopVector) {
     SkFixed     x = 0, y = 0;
     const char* stop = text + byteLength;
 
     SkAutoKern  autokern;
 
     int numGlyphs = 0;
     while (text < stop) {
@@ skipping 24 matching lines @@
     if (cache->getAuxProcData(GlyphCacheAuxProc, &auxData)) {
         scaler = (GrFontScaler*)auxData;
     }
     if (NULL == scaler) {
         scaler = SkNEW_ARGS(GrFontScaler, (cache));
         cache->setAuxProc(GlyphCacheAuxProc, scaler);
     }
 
     return scaler;
 }