Improve caching of dashed paths in GrStencilAndCoverPathRenderer

src/gpu/gl/GrGLPathRange.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLPathRange.h"
 #include "GrGLPath.h"
 #include "GrGLPathRendering.h"
 #include "GrGLGpu.h"
 
-GrGLPathRange::GrGLPathRange(GrGLGpu* gpu, PathGenerator* pathGenerator, const SkStrokeRec& stroke)
-    : INHERITED(gpu, pathGenerator, stroke),
+GrGLPathRange::GrGLPathRange(GrGLGpu* gpu, PathGenerator* pathGenerator, const GrStrokeInfo& stroke)
+    : INHERITED(gpu, pathGenerator),
+      fStroke(stroke),
       fBasePathID(gpu->glPathRendering()->genPaths(this->getNumPaths())),
       fGpuMemorySize(0) {
+    this->init();
     this->registerWithCache();
 }
 
 GrGLPathRange::GrGLPathRange(GrGLGpu* gpu,
                              GrGLuint basePathID,
                              int numPaths,
                              size_t gpuMemorySize,
-                             const SkStrokeRec& stroke)
-    : INHERITED(gpu, numPaths, stroke),
+                             const GrStrokeInfo& stroke)
+    : INHERITED(gpu, numPaths),
+      fStroke(stroke),
       fBasePathID(basePathID),
       fGpuMemorySize(gpuMemorySize) {
+    this->init();
     this->registerWithCache();
 }
 
-void GrGLPathRange::onInitPath(int index, const SkPath& skPath) const {
+void GrGLPathRange::init() {
+    if (fStroke.isDashed()) {
+        fShouldStroke = false;
+        fShouldFill = true;
+    } else {
+        fShouldStroke = fStroke.needToApply();
+        fShouldFill = fStroke.isFillStyle() ||
+                fStroke.getStyle() == SkStrokeRec::kStrokeAndFill_Style;
+    }
+}
+
+void GrGLPathRange::onInitPath(int index, const SkPath& origSkPath) const {
     GrGLGpu* gpu = static_cast<GrGLGpu*>(this->getGpu());
     if (NULL == gpu) {
         return;
     }
 
     // Make sure the path at this index hasn't been initted already.
     SkDEBUGCODE(
         GrGLboolean isPath;
         GR_GL_CALL_RET(gpu->glInterface(), isPath, IsPath(fBasePathID + index)));
     SkASSERT(GR_GL_FALSE == isPath);
 
-    GrGLPath::InitPathObject(gpu, fBasePathID + index, skPath, this->getStroke());
+    const SkPath* skPath = &origSkPath;
+    SkTLazy<SkPath> tmpPath;
+    const GrStrokeInfo* stroke = &fStroke;
+    GrStrokeInfo tmpStroke(SkStrokeRec::kFill_InitStyle);
+
+    // Dashing must be applied to the path. However, if dashing is present,
+    // we must convert all the paths to fills. The GrStrokeInfo::applyDash leaves
+    // simple paths as strokes but converts other paths to fills.
+    // Thus we must stroke the strokes here, so that all paths in the
+    // path range are using the same style.
+    if (fStroke.isDashed()) {
+        if (!stroke->applyDashToPath(tmpPath.init(), &tmpStroke, *skPath)) {
+            return;
+        }
+        skPath = tmpPath.get();
+        stroke = &tmpStroke;
+        if (tmpStroke.needToApply()) {
+            if (!tmpStroke.applyToPath(tmpPath.get(), *tmpPath.get())) {
+                return;
+            }
+            tmpStroke.setFillStyle();
+        }
+    }
+
+    GrGLPath::InitPathObject(gpu, fBasePathID + index, *skPath, *stroke);
 
     // TODO: Use a better approximation for the individual path sizes.
     fGpuMemorySize += 100;
 }
 
 void GrGLPathRange::onRelease() {
     SkASSERT(this->getGpu());
 
     if (0 != fBasePathID && !this->isWrapped()) {
         static_cast<GrGLGpu*>(this->getGpu())->glPathRendering()->deletePaths(fBasePathID,
                                                                               this->getNumPaths());
         fBasePathID = 0;
     }
 
     INHERITED::onRelease();
 }
 
 void GrGLPathRange::onAbandon() {
     fBasePathID = 0;
 
     INHERITED::onAbandon();
 }