Home | History | Annotate | Download | only in gl 
      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         0xFF, // conic
     24         GR_GL_CUBIC_CURVE_TO,
     25         GR_GL_CLOSE_PATH,
     26     };
     27     GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
     28     GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
     29     GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
     30     GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
     31     GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
     32 
     33     GrAssert(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
     34     return gTable[verb];
     35 }
     36 
     37 #ifdef SK_DEBUG
     38 inline int num_pts(const SkPath::Verb verb) {
     39     static const int gTable[] = {
     40         1, // move
     41         1, // line
     42         2, // quad
     43         2, // conic
     44         3, // cubic
     45         0, // close
     46     };
     47     GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
     48     GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
     49     GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
     50     GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
     51     GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
     52 
     53     GrAssert(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
     54     return gTable[verb];
     55 }
     56 #endif
     57 }
     58 
     59 static const bool kIsWrapped = false; // The constructor creates the GL path object.
     60 
     61 GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path) : INHERITED(gpu, kIsWrapped) {
     62 #ifndef SK_SCALAR_IS_FLOAT
     63     GrCrash("Assumes scalar is float.");
     64 #endif
     65     SkASSERT(!path.isEmpty());
     66 
     67     GL_CALL_RET(fPathID, GenPaths(1));
     68 
     69     SkSTArray<16, GrGLubyte, true> pathCommands;
     70     SkSTArray<16, SkPoint, true> pathPoints;
     71 
     72     int verbCnt = path.countVerbs();
     73     int pointCnt = path.countPoints();
     74     pathCommands.resize_back(verbCnt);
     75     pathPoints.resize_back(pointCnt);
     76 
     77     // TODO: Direct access to path points since we could pass them on directly.
     78     path.getPoints(&pathPoints[0], pointCnt);
     79     path.getVerbs(&pathCommands[0], verbCnt);
     80 
     81     GR_DEBUGCODE(int numPts = 0);
     82     for (int i = 0; i < verbCnt; ++i) {
     83         SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
     84         pathCommands[i] = verb_to_gl_path_cmd(v);
     85         GR_DEBUGCODE(numPts += num_pts(v));
     86     }
     87     GrAssert(pathPoints.count() == numPts);
     88 
     89     GL_CALL(PathCommands(fPathID,
     90                          verbCnt, &pathCommands[0],
     91                          2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
     92     fBounds = path.getBounds();
     93 }
     94 
     95 GrGLPath::~GrGLPath() {
     96     this->release();
     97 }
     98 
     99 void GrGLPath::onRelease() {
    100     if (0 != fPathID && !this->isWrapped()) {
    101         GL_CALL(DeletePaths(fPathID, 1));
    102         fPathID = 0;
    103     }
    104 
    105     INHERITED::onRelease();
    106 }
    107 
    108 void GrGLPath::onAbandon() {
    109     fPathID = 0;
    110 
    111     INHERITED::onAbandon();
    112 }
    113