Hook in rough distance field support for fonts

src/gpu/SkGpuDevice.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 "SkGpuDevice.h"
 
 #include "effects/GrTextureDomainEffect.h"
 #include "effects/GrSimpleTextureEffect.h"
 
 #include "GrContext.h"
 #include "GrBitmapTextContext.h"
+#include "GrDistanceFieldTextContext.h"
 
 #include "SkGrTexturePixelRef.h"
 
 #include "SkColorFilter.h"
 #include "SkDeviceImageFilterProxy.h"
 #include "SkDrawProcs.h"
 #include "SkGlyphCache.h"
 #include "SkImageFilter.h"
 #include "SkPathEffect.h"
 #include "SkRRect.h"
 #include "SkStroke.h"
 #include "SkUtils.h"
 #include "SkErrorInternals.h"
 
 #define CACHE_COMPATIBLE_DEVICE_TEXTURES 1
 
+#define USE_DISTANCE_FIELDS              1
+
 #if 0
     extern bool (*gShouldDrawProc)();
     #define CHECK_SHOULD_DRAW(draw, forceI)                     \
         do {                                                    \
             if (gShouldDrawProc && !gShouldDrawProc()) return;  \
             this->prepareDraw(draw, forceI);                    \
         } while (0)
 #else
     #define CHECK_SHOULD_DRAW(draw, forceI) this->prepareDraw(draw, forceI)
 #endif
@@ skipping 1684 matching lines @@
                                          procs->fFontScaler);
 }
 
 SkDrawProcs* SkGpuDevice::initDrawForText(GrTextContext* context) {
 
     // deferred allocation
     if (NULL == fDrawProcs) {
         fDrawProcs = SkNEW(GrSkDrawProcs);
         fDrawProcs->fD1GProc = SkGPU_Draw1Glyph;
         fDrawProcs->fContext = fContext;
+        fDrawProcs->fFlags = 0;
+#if USE_DISTANCE_FIELDS
+        fDrawProcs->fFlags |= SkDrawProcs::kSkipBakedGlyphTransform_Flag;
+        fDrawProcs->fFlags |= SkDrawProcs::kUseScaledGlyphs_Flag;
+#endif
     }
 
     // init our (and GL's) state
     fDrawProcs->fTextContext = context;
     fDrawProcs->fFontScaler = NULL;
     return fDrawProcs;
 }
 
 void SkGpuDevice::drawText(const SkDraw& draw, const void* text,
                           size_t byteLength, SkScalar x, SkScalar y,
                           const SkPaint& paint) {
     CHECK_SHOULD_DRAW(draw, false);
 
     if (fContext->getMatrix().hasPerspective()) {
         // this guy will just call our drawPath()
         draw.drawText((const char*)text, byteLength, x, y, paint);
     } else {
         SkDraw myDraw(draw);
 
         GrPaint grPaint;
         if (!skPaint2GrPaintShader(this, paint, true, &grPaint)) {
             return;
         }
+#if USE_DISTANCE_FIELDS
+        GrDistanceFieldTextContext context(fContext, grPaint, paint.getTextSize());
+#else
         GrBitmapTextContext context(fContext, grPaint);
+#endif
         myDraw.fProcs = this->initDrawForText(&context);
         this->INHERITED::drawText(myDraw, text, byteLength, x, y, paint);
     }
 }
 
 void SkGpuDevice::drawPosText(const SkDraw& draw, const void* text,
                              size_t byteLength, const SkScalar pos[],
                              SkScalar constY, int scalarsPerPos,
                              const SkPaint& paint) {
     CHECK_SHOULD_DRAW(draw, false);
 
     if (fContext->getMatrix().hasPerspective()) {
         // this guy will just call our drawPath()
         draw.drawPosText((const char*)text, byteLength, pos, constY,
                          scalarsPerPos, paint);
     } else {
         SkDraw myDraw(draw);
 
         GrPaint grPaint;
         if (!skPaint2GrPaintShader(this, paint, true, &grPaint)) {
             return;
         }
+#if USE_DISTANCE_FIELDS
+        GrDistanceFieldTextContext context(fContext, grPaint, paint.getTextSize());
+#else
         GrBitmapTextContext context(fContext, grPaint);
+#endif
         myDraw.fProcs = this->initDrawForText(&context);
         this->INHERITED::drawPosText(myDraw, text, byteLength, pos, constY,
                                      scalarsPerPos, paint);
     }
 }
 
 void SkGpuDevice::drawTextOnPath(const SkDraw& draw, const void* text,
                                 size_t len, const SkPath& path,
                                 const SkMatrix* m, const SkPaint& paint) {
     CHECK_SHOULD_DRAW(draw, false);
@@ skipping 71 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     SkASSERT(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }