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      1 
      2 /*
      3  * Copyright 2012 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include "GrGLPath.h"
     10 #include "GrGpuGL.h"
     11 
     12 #define GPUGL static_cast<GrGpuGL*>(this->getGpu())
     13 
     14 #define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
     15 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(GPUGL->glInterface(), R, X)
     16 
     17 namespace {
     18 inline GrGLubyte verb_to_gl_path_cmd(const SkPath::Verb verb) {
     19     static const GrGLubyte gTable[] = {
     20         GR_GL_MOVE_TO,
     21         GR_GL_LINE_TO,
     22         GR_GL_QUADRATIC_CURVE_TO,
     23         GR_GL_CUBIC_CURVE_TO,
     24         GR_GL_CLOSE_PATH,
     25     };
     26     GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
     27     GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
     28     GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
     29     GR_STATIC_ASSERT(3 == SkPath::kCubic_Verb);
     30     GR_STATIC_ASSERT(4 == SkPath::kClose_Verb);
     31 
     32     GrAssert(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
     33     return gTable[verb];
     34 }
     35 
     36 #ifdef SK_DEBUG
     37 inline int num_pts(const SkPath::Verb verb) {
     38     static const int gTable[] = {
     39         1, // move
     40         1, // line
     41         2, // quad
     42         3, // cubic
     43         0, // close
     44     };
     45     GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
     46     GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
     47     GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
     48     GR_STATIC_ASSERT(3 == SkPath::kCubic_Verb);
     49     GR_STATIC_ASSERT(4 == SkPath::kClose_Verb);
     50 
     51     GrAssert(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
     52     return gTable[verb];
     53 }
     54 #endif
     55 }
     56 
     57 static const bool kIsWrapped = false; // The constructor creates the GL path object.
     58 
     59 GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path) : INHERITED(gpu, kIsWrapped) {
     60     GL_CALL_RET(fPathID, GenPaths(1));
     61     SkPath::Iter iter(path, true);
     62 
     63     SkSTArray<16, GrGLubyte, true> pathCommands;
     64 #ifndef SK_SCALAR_IS_FLOAT
     65     GrCrash("Assumes scalar is float.");
     66 #endif
     67     SkSTArray<16, SkPoint, true> pathPoints;
     68 
     69     int verbCnt = path.countVerbs();
     70     int pointCnt = path.countPoints();
     71     pathCommands.resize_back(verbCnt);
     72     pathPoints.resize_back(pointCnt);
     73 
     74     // TODO: Direct access to path points since we could pass them on directly.
     75     path.getPoints(&pathPoints[0], pointCnt);
     76     path.getVerbs(&pathCommands[0], verbCnt);
     77 
     78     GR_DEBUGCODE(int numPts = 0);
     79     for (int i = 0; i < verbCnt; ++i) {
     80         SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
     81         pathCommands[i] = verb_to_gl_path_cmd(v);
     82         GR_DEBUGCODE(numPts += num_pts(v));
     83     }
     84     GrAssert(pathPoints.count() == numPts);
     85 
     86     GL_CALL(PathCommands(fPathID,
     87                          verbCnt, &pathCommands[0],
     88                          2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
     89     fBounds = path.getBounds();
     90 }
     91 
     92 GrGLPath::~GrGLPath() {
     93     this->release();
     94 }
     95 
     96 void GrGLPath::onRelease() {
     97     if (0 != fPathID && !this->isWrapped()) {
     98         GL_CALL(DeletePaths(fPathID, 1));
     99         fPathID = 0;
    100     }
    101 
    102     INHERITED::onRelease();
    103 }
    104 
    105 void GrGLPath::onAbandon() {
    106     fPathID = 0;
    107 
    108     INHERITED::onAbandon();
    109 }
    110