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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "GrGLPathRange.h"
      9 #include "GrGLPath.h"
     10 #include "GrGLPathRendering.h"
     11 #include "GrGLGpu.h"
     12 
     13 GrGLPathRange::GrGLPathRange(GrGLGpu* gpu, PathGenerator* pathGenerator, const GrStyle& style)
     14     : INHERITED(gpu, pathGenerator),
     15       fStyle(style),
     16       fBasePathID(gpu->glPathRendering()->genPaths(this->getNumPaths())),
     17       fGpuMemorySize(0) {
     18     this->init();
     19     this->registerWithCache(SkBudgeted::kYes);
     20 }
     21 
     22 GrGLPathRange::GrGLPathRange(GrGLGpu* gpu,
     23                              GrGLuint basePathID,
     24                              int numPaths,
     25                              size_t gpuMemorySize,
     26                              const GrStyle& style)
     27     : INHERITED(gpu, numPaths),
     28       fStyle(style),
     29       fBasePathID(basePathID),
     30       fGpuMemorySize(gpuMemorySize) {
     31     this->init();
     32     this->registerWithCache(SkBudgeted::kYes);
     33 }
     34 
     35 void GrGLPathRange::init() {
     36     const SkStrokeRec& stroke = fStyle.strokeRec();
     37     // Must force fill:
     38     // * dashing: NVPR stroke dashing is different to Skia.
     39     // * end caps: NVPR stroking degenerate contours with end caps is different to Skia.
     40     bool forceFill = fStyle.pathEffect() ||
     41             (stroke.needToApply() && stroke.getCap() != SkPaint::kButt_Cap);
     42 
     43     if (forceFill) {
     44         fShouldStroke = false;
     45         fShouldFill = true;
     46     } else {
     47         fShouldStroke = stroke.needToApply();
     48         fShouldFill = stroke.isFillStyle() ||
     49                 stroke.getStyle() == SkStrokeRec::kStrokeAndFill_Style;
     50     }
     51 }
     52 
     53 void GrGLPathRange::onInitPath(int index, const SkPath& origSkPath) const {
     54     GrGLGpu* gpu = static_cast<GrGLGpu*>(this->getGpu());
     55     if (nullptr == gpu) {
     56         return;
     57     }
     58     // Make sure the path at this index hasn't been initted already.
     59     SkDEBUGCODE(
     60         GrGLboolean isPath;
     61         GR_GL_CALL_RET(gpu->glInterface(), isPath, IsPath(fBasePathID + index)));
     62     SkASSERT(GR_GL_FALSE == isPath);
     63 
     64     if (origSkPath.isEmpty()) {
     65         GrGLPath::InitPathObjectEmptyPath(gpu, fBasePathID + index);
     66     } else if (fShouldStroke) {
     67         GrGLPath::InitPathObjectPathData(gpu, fBasePathID + index, origSkPath);
     68         GrGLPath::InitPathObjectStroke(gpu, fBasePathID + index, fStyle.strokeRec());
     69     } else {
     70         const SkPath* skPath = &origSkPath;
     71         SkTLazy<SkPath> tmpPath;
     72         if (!fStyle.isSimpleFill()) {
     73             SkStrokeRec::InitStyle fill;
     74             // The path effect must be applied to the path. However, if a path effect is present,
     75             // we must convert all the paths to fills. The path effect application may leave
     76             // simple paths as strokes but converts other paths to fills.
     77             // Thus we must stroke the strokes here, so that all paths in the
     78             // path range are using the same style.
     79             if (!fStyle.applyToPath(tmpPath.init(), &fill, *skPath, SK_Scalar1)) {
     80                 return;
     81             }
     82             // We shouldn't have allowed hairlines or arbitrary path effect styles to get here
     83             // so after application we better have a filled path.
     84             SkASSERT(SkStrokeRec::kFill_InitStyle == fill);
     85             skPath = tmpPath.get();
     86 
     87         }
     88         GrGLPath::InitPathObjectPathData(gpu, fBasePathID + index, *skPath);
     89     }
     90     // TODO: Use a better approximation for the individual path sizes.
     91     fGpuMemorySize += 100;
     92 }
     93 
     94 void GrGLPathRange::onRelease() {
     95     SkASSERT(this->getGpu());
     96 
     97     if (0 != fBasePathID) {
     98         static_cast<GrGLGpu*>(this->getGpu())->glPathRendering()->deletePaths(fBasePathID,
     99                                                                               this->getNumPaths());
    100         fBasePathID = 0;
    101     }
    102 
    103     INHERITED::onRelease();
    104 }
    105 
    106 void GrGLPathRange::onAbandon() {
    107     fBasePathID = 0;
    108 
    109     INHERITED::onAbandon();
    110 }
    111