Restore text alloc optimizations.

src/gpu/GrDistanceFieldTextContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDistanceFieldTextContext.h"
 #include "GrAtlas.h"
 #include "SkColorFilter.h"
@@ skipping 42 matching lines @@
     {kVec2f_GrVertexAttribType,  sizeof(SkPoint) + sizeof(GrColor), kEffect_GrVertexAttribBinding}
 };
     
 static const size_t kTextVAColorSize = 2 * sizeof(SkPoint) + sizeof(GrColor); 
 
 };
 
 GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context,
                                                        const SkDeviceProperties& properties,
                                                        bool enable)
-                                                    : GrTextContext(context, properties) {
+                                                    : GrTextContext(context, properties)
+                                                    , fStrike(NULL)
 #if SK_FORCE_DISTANCEFIELD_FONTS
-    fEnableDFRendering = true;
+                                                    , fEnableDFRendering(true)
 #else
-    fEnableDFRendering = enable;
+                                                    , fEnableDFRendering(enable)
 #endif
-    fStrike = NULL;
-    fGammaTexture = NULL;
-
-    fCurrTexture = NULL;
-    fCurrVertex = 0;
-    fEffectTextureUniqueID = SK_InvalidUniqueID;
-    fEffectColor = GrColor_ILLEGAL;
-    fEffectFlags = 0;
-
-    fVertices = NULL;
-    fMaxVertices = 0;
-
+                                                    , fEffectTextureUniqueID(SK_InvalidUniqueID)
+                                                    , fEffectColor(GrColor_ILLEGAL)
+                                                    , fEffectFlags(0)
+                                                    , fGammaTexture(NULL)
+                                                    , fVertices(NULL)
+                                                    , fVertexCount(0)
+                                                    , fCurrVertex(0) {
     fVertexBounds.setLargestInverted();
 }
 
 GrDistanceFieldTextContext::~GrDistanceFieldTextContext() {
     this->flushGlyphs();
     SkSafeSetNull(fGammaTexture);
 }
 
 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint) {
     if (!fEnableDFRendering && !paint.isDistanceFieldTextTEMP()) {
@@ skipping 28 matching lines @@
     unsigned r = SkColorGetR(c);
     unsigned g = SkColorGetG(c);
     unsigned b = SkColorGetB(c);
     return GrColorPackRGBA(r, g, b, 0xff);
 }
 
 void GrDistanceFieldTextContext::setupCoverageEffect(const SkColor& filteredColor) {
     GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kBilerp_FilterMode);
     GrTextureParams gammaParams(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
     
-    uint32_t textureUniqueID = fCurrTexture->getUniqueID();
+    GrTexture* currTexture = fStrike->getTexture();
+    SkASSERT(currTexture);
+    uint32_t textureUniqueID = currTexture->getUniqueID();
     
     // set up any flags
     uint32_t flags = 0;
     flags |= fContext->getMatrix().isSimilarity() ? kSimilarity_DistanceFieldEffectFlag : 0;
     flags |= fUseLCDText ? kUseLCD_DistanceFieldEffectFlag : 0;
     flags |= fUseLCDText && fContext->getMatrix().rectStaysRect() ?
     kRectToRect_DistanceFieldEffectFlag : 0;
     bool useBGR = SkDeviceProperties::Geometry::kBGR_Layout ==
     fDeviceProperties.fGeometry.getLayout();
     flags |= fUseLCDText && useBGR ? kBGR_DistanceFieldEffectFlag : 0;
     
     // see if we need to create a new effect
     if (textureUniqueID != fEffectTextureUniqueID ||
         filteredColor != fEffectColor ||
         flags != fEffectFlags) {
         if (fUseLCDText) {
             GrColor colorNoPreMul = skcolor_to_grcolor_nopremultiply(filteredColor);
-            fCachedEffect.reset(GrDistanceFieldLCDTextureEffect::Create(fCurrTexture,
+            fCachedEffect.reset(GrDistanceFieldLCDTextureEffect::Create(currTexture,
                                                                         params,
                                                                         fGammaTexture,
                                                                         gammaParams,
                                                                         colorNoPreMul,
                                                                         flags));
         } else {
 #ifdef SK_GAMMA_APPLY_TO_A8
             U8CPU lum = SkColorSpaceLuminance::computeLuminance(fDeviceProperties.fGamma,
                                                                 filteredColor);
-            fCachedEffect.reset(GrDistanceFieldTextureEffect::Create(fCurrTexture,
+            fCachedEffect.reset(GrDistanceFieldTextureEffect::Create(currTexture,
                                                                      params,
                                                                      fGammaTexture,
                                                                      gammaParams,
                                                                      lum/255.f,
                                                                      flags));
 #else
-            fCachedEffect.reset(GrDistanceFieldTextureEffect::Create(fCurrTexture,
+            fCachedEffect.reset(GrDistanceFieldTextureEffect::Create(currTexture,
                                                                      params, flags));
 #endif
         }
         fEffectTextureUniqueID = textureUniqueID;
         fEffectColor = filteredColor;
         fEffectFlags = flags;
     }
     
 }
 
@@ skipping 48 matching lines @@
             // set back to normal in case we took LCD path previously.
             drawState->setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
             // We're using per-vertex color.
             SkASSERT(drawState->hasColorVertexAttribute());
         }
         int nGlyphs = fCurrVertex / 4;
         fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
         fDrawTarget->drawIndexedInstances(kTriangles_GrPrimitiveType,
                                           nGlyphs,
                                           4, 6, &fVertexBounds);
-        fDrawTarget->resetVertexSource();
-        fVertices = NULL;
-        fMaxVertices = 0;
         fCurrVertex = 0;
-        SkSafeSetNull(fCurrTexture);
         fVertexBounds.setLargestInverted();
     }
+    
+    fDrawTarget->resetVertexSource();
+    fVertices = NULL;
 }
 
 void GrDistanceFieldTextContext::drawPackedGlyph(GrGlyph::PackedID packed,
                                                  SkFixed vx, SkFixed vy,
                                                  GrFontScaler* scaler) {
-    if (NULL == fDrawTarget) {
-        return;
-    }
-    
-    if (NULL == fStrike) {
-        fStrike = fContext->getFontCache()->getStrike(scaler, true);
-    }
-    
     GrGlyph* glyph = fStrike->getGlyph(packed, scaler);
     if (NULL == glyph || glyph->fBounds.isEmpty()) {
         return;
     }
 
     SkScalar sx = SkFixedToScalar(vx);
     SkScalar sy = SkFixedToScalar(vy);
 /*
     // not valid, need to find a different solution for this
     vx += SkIntToFixed(glyph->fBounds.fLeft);
@@ skipping 23 matching lines @@
             fStrike->addGlyphToAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
         if (c_DumpFontCache) {
 #ifdef SK_DEVELOPER
             fContext->getFontCache()->dump();
 #endif
         }
 
-        // before we purge the cache, we must flush any accumulated draws
+        // flush any accumulated draws to allow us to free up a plot
+        int remainingVertexCount = fVertexCount - fCurrVertex;
         this->flushGlyphs();
         fContext->flush();
 
+        // need to reallocate the vertex buffer for the remaining glyphs
+        fVertexCount = remainingVertexCount;
+        bool success = fDrawTarget->reserveVertexAndIndexSpace(fVertexCount,
+                                                               0,
+                                                               &fVertices,
+                                                               NULL);
+        GrAlwaysAssert(success);
+
         // we should have an unused plot now
         if (fContext->getFontCache()->freeUnusedPlot(fStrike) &&
             fStrike->addGlyphToAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
 
         if (NULL == glyph->fPath) {
             SkPath* path = SkNEW(SkPath);
             if (!scaler->getGlyphPath(glyph->glyphID(), path)) {
                 // flag the glyph as being dead?
@@ skipping 15 matching lines @@
     }
 
 HAS_ATLAS:
     SkASSERT(glyph->fPlot);
     GrDrawTarget::DrawToken drawToken = fDrawTarget->getCurrentDrawToken();
     glyph->fPlot->setDrawToken(drawToken);
 
     GrTexture* texture = glyph->fPlot->texture();
     SkASSERT(texture);
 
-    if (fCurrTexture != texture || fCurrVertex + 4 > fMaxVertices) {
-        this->flushGlyphs();
-        fCurrTexture = texture;
-        fCurrTexture->ref();
-    }
-
-    bool useColorVerts = !fUseLCDText;
-    
-    if (NULL == fVertices) {
-        // If we need to reserve vertices allow the draw target to suggest
-        // a number of verts to reserve and whether to perform a flush.
-        fMaxVertices = kMinRequestedVerts;
-        if (useColorVerts) {
-            fDrawTarget->drawState()->setVertexAttribs<gTextVertexWithColorAttribs>(
-                                                    SK_ARRAY_COUNT(gTextVertexWithColorAttribs),
-                                                    kTextVAColorSize);
-        } else {
-            fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
-                                                    SK_ARRAY_COUNT(gTextVertexAttribs),
-                                                    kTextVASize);
-        }
-        bool flush = fDrawTarget->geometryHints(&fMaxVertices, NULL);
-        if (flush) {
-            this->flushGlyphs();
-            fContext->flush();
-            if (useColorVerts) {
-                fDrawTarget->drawState()->setVertexAttribs<gTextVertexWithColorAttribs>(
-                                                    SK_ARRAY_COUNT(gTextVertexWithColorAttribs),
-                                                    kTextVAColorSize);
-            } else {
-                fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
-                                                    SK_ARRAY_COUNT(gTextVertexAttribs),
-                                                    kTextVASize);
-            }
-        }
-        fMaxVertices = kDefaultRequestedVerts;
-        // ignore return, no point in flushing again.
-        fDrawTarget->geometryHints(&fMaxVertices, NULL);
-        
-        int maxQuadVertices = 4 * fContext->getQuadIndexBuffer()->maxQuads();
-        if (fMaxVertices < kMinRequestedVerts) {
-            fMaxVertices = kDefaultRequestedVerts;
-        } else if (fMaxVertices > maxQuadVertices) {
-            // don't exceed the limit of the index buffer
-            fMaxVertices = maxQuadVertices;
-        }
-        bool success = fDrawTarget->reserveVertexAndIndexSpace(fMaxVertices,
-                                                               0,
-                                                               &fVertices,
-                                                               NULL);
-        GrAlwaysAssert(success);
-    }
-    
     SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft + SK_DistanceFieldInset);
     SkScalar dy = SkIntToScalar(glyph->fBounds.fTop + SK_DistanceFieldInset);
     SkScalar width = SkIntToScalar(glyph->fBounds.width() - 2*SK_DistanceFieldInset);
     SkScalar height = SkIntToScalar(glyph->fBounds.height() - 2*SK_DistanceFieldInset);
 
     SkScalar scale = fTextRatio;
     dx *= scale;
     dy *= scale;
     sx += dx;
     sy += dy;
     width *= scale;
     height *= scale;
-    
+
     SkFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX + SK_DistanceFieldInset);
     SkFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY + SK_DistanceFieldInset);
     SkFixed tw = SkIntToFixed(glyph->fBounds.width() - 2*SK_DistanceFieldInset);
     SkFixed th = SkIntToFixed(glyph->fBounds.height() - 2*SK_DistanceFieldInset);
 
     SkRect r;
     r.fLeft = sx;
     r.fTop = sy;
     r.fRight = sx + width;
     r.fBottom = sy + height;
@@ skipping 10 matching lines @@
     positions->setRectFan(r.fLeft, r.fTop, r.fRight, r.fBottom, vertSize);
 
     // The texture coords are last in both the with and without color vertex layouts.
     SkPoint* textureCoords = reinterpret_cast<SkPoint*>(
             reinterpret_cast<intptr_t>(positions) + vertSize  - sizeof(SkPoint));
     textureCoords->setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
                               SkFixedToFloat(texture->normalizeFixedY(ty)),
                               SkFixedToFloat(texture->normalizeFixedX(tx + tw)),
                               SkFixedToFloat(texture->normalizeFixedY(ty + th)),
                               vertSize);
-    if (useColorVerts) {
+    if (!fUseLCDText) {
         if (0xFF == GrColorUnpackA(fPaint.getColor())) {
             fDrawTarget->drawState()->setHint(GrDrawState::kVertexColorsAreOpaque_Hint, true);
         }
         // color comes after position.
         GrColor* colors = reinterpret_cast<GrColor*>(positions + 1);
         for (int i = 0; i < 4; ++i) {
             *colors = fPaint.getColor();
             colors = reinterpret_cast<GrColor*>(reinterpret_cast<intptr_t>(colors) + vertSize);
         }
     }
@@ skipping 69 matching lines @@
             return;
         }
 
         context->writeTexturePixels(*gammaTexture,
                                     0, 0, width, height,
                                     (*gammaTexture)->config(), data.get(), 0,
                                     GrContext::kDontFlush_PixelOpsFlag);
     }
 }
 
+void GrDistanceFieldTextContext::allocateVertices(const char text[], size_t byteLength) {
+    SkASSERT(NULL == fVertices);
+    if (!fUseLCDText) {
+        fDrawTarget->drawState()->setVertexAttribs<gTextVertexWithColorAttribs>(
+                                                    SK_ARRAY_COUNT(gTextVertexWithColorAttribs),
+                                                    kTextVAColorSize);
+    } else {
+        fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
+                                                    SK_ARRAY_COUNT(gTextVertexAttribs),
+                                                    kTextVASize);
+    }
+    fVertexCount = 4*fSkPaint.textToGlyphs(text, byteLength, NULL);
+    bool success = fDrawTarget->reserveVertexAndIndexSpace(fVertexCount,
+                                                           0,
+                                                           &fVertices,
+                                                           NULL);
+    GrAlwaysAssert(success);
+}
+
 void GrDistanceFieldTextContext::drawText(const GrPaint& paint, const SkPaint& skPaint,
                                           const char text[], size_t byteLength,
                                           SkScalar x, SkScalar y) {
     SkASSERT(byteLength == 0 || text != NULL);
 
     // nothing to draw or can't draw
     if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/
         || fSkPaint.getRasterizer()) {
         return;
     }
 
     this->init(paint, skPaint);
 
+    if (NULL == fDrawTarget) {
+        return;
+    }
+    
     SkScalar sizeRatio = fTextRatio;
 
     SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
 
     SkAutoGlyphCacheNoGamma    autoCache(fSkPaint, &fDeviceProperties, NULL);
     SkGlyphCache*              cache = autoCache.getCache();
     GrFontScaler*              fontScaler = GetGrFontScaler(cache);
+    if (NULL == fStrike) {
+        fStrike = fContext->getFontCache()->getStrike(fontScaler, true);
+    }
 
     setup_gamma_texture(fContext, cache, fDeviceProperties, &fGammaTexture);
 
+    this->allocateVertices(text, byteLength);
+
     // need to measure first
     // TODO - generate positions and pre-load cache as well?
     const char* stop = text + byteLength;
     if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) {
         SkFixed    stopX = 0;
         SkFixed    stopY = 0;
 
         const char* textPtr = text;
         while (textPtr < stop) {
             // don't need x, y here, since all subpixel variants will have the
@@ skipping 47 matching lines @@
     SkASSERT(byteLength == 0 || text != NULL);
     SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
 
     // nothing to draw
     if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/) {
         return;
     }
 
     this->init(paint, skPaint);
 
+    if (NULL == fDrawTarget) {
+        return;
+    }
+    
     SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
 
     SkAutoGlyphCacheNoGamma    autoCache(fSkPaint, &fDeviceProperties, NULL);
     SkGlyphCache*              cache = autoCache.getCache();
     GrFontScaler*              fontScaler = GetGrFontScaler(cache);
+    if (NULL == fStrike) {
+        fStrike = fContext->getFontCache()->getStrike(fontScaler, true);
+    }
 
     setup_gamma_texture(fContext, cache, fDeviceProperties, &fGammaTexture);
 
+    this->allocateVertices(text, byteLength);
+
     const char*        stop = text + byteLength;
 
     if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) {
         while (text < stop) {
             // the last 2 parameters are ignored
             const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
 
             if (glyph.fWidth) {
                 SkScalar x = pos[0];
                 SkScalar y = scalarsPerPosition == 1 ? constY : pos[1];
@@ skipping 23 matching lines @@
                                       SkScalarToFixed(x) - (glyph.fAdvanceX >> alignShift),
                                       SkScalarToFixed(y) - (glyph.fAdvanceY >> alignShift),
                                       fontScaler);
             }
             pos += scalarsPerPosition;
         }
     }
 
     this->finish();
 }