gfxstate.cc

swf文件查看工具,能够看flash文件的格式

}

GfxRadialShading::~GfxRadialShading() {
  int i;

  for (i = 0; i < nFuncs; ++i) {
    delete funcs[i];
  }
}

GfxRadialShading *GfxRadialShading::parse(Dict *dict) {
  GfxRadialShading *shading;
  double x0A, y0A, r0A, x1A, y1A, r1A;
  double t0A, t1A;
  Function *funcsA[gfxColorMaxComps];
  int nFuncsA;
  GBool extend0A, extend1A;
  Object obj1, obj2;
  int i;

  x0A = y0A = r0A = x1A = y1A = r1A = 0;
  if (dict->lookup("Coords", &obj1)->isArray() &&
      obj1.arrayGetLength() == 6) {
    x0A = obj1.arrayGet(0, &obj2)->getNum();
    obj2.free();
    y0A = obj1.arrayGet(1, &obj2)->getNum();
    obj2.free();
    r0A = obj1.arrayGet(2, &obj2)->getNum();
    obj2.free();
    x1A = obj1.arrayGet(3, &obj2)->getNum();
    obj2.free();
    y1A = obj1.arrayGet(4, &obj2)->getNum();
    obj2.free();
    r1A = obj1.arrayGet(5, &obj2)->getNum();
    obj2.free();
  } else {
    error(-1, "Missing or invalid Coords in shading dictionary");
    goto err1;
  }
  obj1.free();

  t0A = 0;
  t1A = 1;
  if (dict->lookup("Domain", &obj1)->isArray() &&
      obj1.arrayGetLength() == 2) {
    t0A = obj1.arrayGet(0, &obj2)->getNum();
    obj2.free();
    t1A = obj1.arrayGet(1, &obj2)->getNum();
    obj2.free();
  }
  obj1.free();

  dict->lookup("Function", &obj1);
  if (obj1.isArray()) {
    nFuncsA = obj1.arrayGetLength();
    if (nFuncsA > gfxColorMaxComps) {
      error(-1, "Invalid Function array in shading dictionary");
      goto err1;
    }
    for (i = 0; i < nFuncsA; ++i) {
      obj1.arrayGet(i, &obj2);
      if (!(funcsA[i] = Function::parse(&obj2))) {
	obj1.free();
	obj2.free();
	goto err1;
      }
      obj2.free();
    }
  } else {
    nFuncsA = 1;
    if (!(funcsA[0] = Function::parse(&obj1))) {
      obj1.free();
      goto err1;
    }
  }
  obj1.free();

  extend0A = extend1A = gFalse;
  if (dict->lookup("Extend", &obj1)->isArray() &&
      obj1.arrayGetLength() == 2) {
    extend0A = obj1.arrayGet(0, &obj2)->getBool();
    obj2.free();
    extend1A = obj1.arrayGet(1, &obj2)->getBool();
    obj2.free();
  }
  obj1.free();

  shading = new GfxRadialShading(x0A, y0A, r0A, x1A, y1A, r1A, t0A, t1A,
				 funcsA, nFuncsA, extend0A, extend1A);
  if (!shading->init(dict)) {
    delete shading;
    return NULL;
  }
  return shading;

 err1:
  return NULL;
}

GfxShading *GfxRadialShading::copy() {
  return new GfxRadialShading(this);
}

void GfxRadialShading::getColor(double t, GfxColor *color) {
  double out[gfxColorMaxComps];
  int i;

  // NB: there can be one function with n outputs or n functions with
  // one output each (where n = number of color components)
  for (i = 0; i < gfxColorMaxComps; ++i) {
    out[i] = 0;
  }
  for (i = 0; i < nFuncs; ++i) {
    funcs[i]->transform(&t, &out[i]);
  }
  for (i = 0; i < gfxColorMaxComps; ++i) {
    color->c[i] = dblToCol(out[i]);
  }
}

//------------------------------------------------------------------------
// GfxShadingBitBuf
//------------------------------------------------------------------------

class GfxShadingBitBuf {
public:

  GfxShadingBitBuf(Stream *strA);
  ~GfxShadingBitBuf();
  GBool getBits(int n, Guint *val);
  void flushBits();

private:

  Stream *str;
  int bitBuf;
  int nBits;
};

GfxShadingBitBuf::GfxShadingBitBuf(Stream *strA) {
  str = strA;
  str->reset();
  bitBuf = 0;
  nBits = 0;
}

GfxShadingBitBuf::~GfxShadingBitBuf() {
  str->close();
}

GBool GfxShadingBitBuf::getBits(int n, Guint *val) {
  int x;

  if (nBits >= n) {
    x = (bitBuf >> (nBits - n)) & ((1 << n) - 1);
    nBits -= n;
  } else {
    x = 0;
    if (nBits > 0) {
      x = bitBuf & ((1 << nBits) - 1);
      n -= nBits;
      nBits = 0;
    }
    while (n > 0) {
      if ((bitBuf = str->getChar()) == EOF) {
	nBits = 0;
	return gFalse;
      }
      if (n >= 8) {
	x = (x << 8) | bitBuf;
	n -= 8;
      } else {
	x = (x << n) | (bitBuf >> (8 - n));
	nBits = 8 - n;
	n = 0;
      }
    }
  }
  *val = x;
  return gTrue;
}

void GfxShadingBitBuf::flushBits() {
  bitBuf = 0;
  nBits = 0;
}

//------------------------------------------------------------------------
// GfxGouraudTriangleShading
//------------------------------------------------------------------------

GfxGouraudTriangleShading::GfxGouraudTriangleShading(
			       int typeA,
			       GfxGouraudVertex *verticesA, int nVerticesA,
			       int (*trianglesA)[3], int nTrianglesA,
			       Function **funcsA, int nFuncsA):
  GfxShading(typeA)
{
  int i;

  vertices = verticesA;
  nVertices = nVerticesA;
  triangles = trianglesA;
  nTriangles = nTrianglesA;
  nFuncs = nFuncsA;
  for (i = 0; i < nFuncs; ++i) {
    funcs[i] = funcsA[i];
  }
}

GfxGouraudTriangleShading::GfxGouraudTriangleShading(
			       GfxGouraudTriangleShading *shading):
  GfxShading(shading)
{
  int i;

  nVertices = shading->nVertices;
  vertices = (GfxGouraudVertex *)gmallocn(nVertices, sizeof(GfxGouraudVertex));
  memcpy(vertices, shading->vertices, nVertices * sizeof(GfxGouraudVertex));
  nTriangles = shading->nTriangles;
  triangles = (int (*)[3])gmallocn(nTriangles * 3, sizeof(int));
  memcpy(triangles, shading->triangles, nTriangles * 3 * sizeof(int));
  nFuncs = shading->nFuncs;
  for (i = 0; i < nFuncs; ++i) {
    funcs[i] = shading->funcs[i]->copy();
  }
}

GfxGouraudTriangleShading::~GfxGouraudTriangleShading() {
  int i;

  gfree(vertices);
  gfree(triangles);
  for (i = 0; i < nFuncs; ++i) {
    delete funcs[i];
  }
}

GfxGouraudTriangleShading *GfxGouraudTriangleShading::parse(int typeA,
							    Dict *dict,
							    Stream *str) {
  GfxGouraudTriangleShading *shading;
  Function *funcsA[gfxColorMaxComps];
  int nFuncsA;
  int coordBits, compBits, flagBits, vertsPerRow, nRows;
  double xMin, xMax, yMin, yMax;
  double cMin[gfxColorMaxComps], cMax[gfxColorMaxComps];
  double xMul, yMul;
  double cMul[gfxColorMaxComps];
  GfxGouraudVertex *verticesA;
  int (*trianglesA)[3];
  int nComps, nVerticesA, nTrianglesA, vertSize, triSize;
  Guint x, y, flag;
  Guint c[gfxColorMaxComps];
  GfxShadingBitBuf *bitBuf;
  Object obj1, obj2;
  int i, j, k, state;

  if (dict->lookup("BitsPerCoordinate", &obj1)->isInt()) {
    coordBits = obj1.getInt();
  } else {
    error(-1, "Missing or invalid BitsPerCoordinate in shading dictionary");
    goto err2;
  }
  obj1.free();
  if (dict->lookup("BitsPerComponent", &obj1)->isInt()) {
    compBits = obj1.getInt();
  } else {
    error(-1, "Missing or invalid BitsPerComponent in shading dictionary");
    goto err2;
  }
  obj1.free();
  flagBits = vertsPerRow = 0; // make gcc happy
  if (typeA == 4) {
    if (dict->lookup("BitsPerFlag", &obj1)->isInt()) {
      flagBits = obj1.getInt();
    } else {
      error(-1, "Missing or invalid BitsPerFlag in shading dictionary");
      goto err2;
    }
    obj1.free();
  } else {
    if (dict->lookup("VerticesPerRow", &obj1)->isInt()) {
      vertsPerRow = obj1.getInt();
    } else {
      error(-1, "Missing or invalid VerticesPerRow in shading dictionary");
      goto err2;
    }
    obj1.free();
  }
  if (dict->lookup("Decode", &obj1)->isArray() &&
      obj1.arrayGetLength() >= 6) {
    xMin = obj1.arrayGet(0, &obj2)->getNum();
    obj2.free();
    xMax = obj1.arrayGet(1, &obj2)->getNum();
    obj2.free();
    xMul = (xMax - xMin) / (pow(2.0, coordBits) - 1);
    yMin = obj1.arrayGet(2, &obj2)->getNum();
    obj2.free();
    yMax = obj1.arrayGet(3, &obj2)->getNum();
    obj2.free();
    yMul = (yMax - yMin) / (pow(2.0, coordBits) - 1);
    for (i = 0; 5 + 2*i < obj1.arrayGetLength() && i < gfxColorMaxComps; ++i) {
      cMin[i] = obj1.arrayGet(4 + 2*i, &obj2)->getNum();
      obj2.free();
      cMax[i] = obj1.arrayGet(5 + 2*i, &obj2)->getNum();
      obj2.free();
      cMul[i] = (cMax[i] - cMin[i]) / (double)((1 << compBits) - 1);
    }
    nComps = i;
  } else {
    error(-1, "Missing or invalid Decode array in shading dictionary");
    goto err2;
  }
  obj1.free();

  if (!dict->lookup("Function", &obj1)->isNull()) {
    if (obj1.isArray()) {
      nFuncsA = obj1.arrayGetLength();
      if (nFuncsA > gfxColorMaxComps) {
	error(-1, "Invalid Function array in shading dictionary");
	goto err1;
      }
      for (i = 0; i < nFuncsA; ++i) {
	obj1.arrayGet(i, &obj2);
	if (!(funcsA[i] = Function::parse(&obj2))) {
	  obj1.free();
	  obj2.free();
	  goto err1;
	}
	obj2.free();
      }
    } else {
      nFuncsA = 1;
      if (!(funcsA[0] = Function::parse(&obj1))) {
	obj1.free();
	goto err1;
      }
    }
  } else {
    nFuncsA = 0;
  }
  obj1.free();

  nVerticesA = nTrianglesA = 0;
  verticesA = NULL;
  trianglesA = NULL;
  vertSize = triSize = 0;
  state = 0;
  flag = 0; // make gcc happy
  bitBuf = new GfxShadingBitBuf(str);
  while (1) {
    if (typeA == 4) {
      if (!bitBuf->getBits(flagBits, &flag)) {
	break;
      }
    }
    if (!bitBuf->getBits(coordBits, &x) ||
	!bitBuf->getBits(coordBits, &y)) {
      break;
    }
    for (i = 0; i < nComps; ++i) {
      if (!bitBuf->getBits(compBits, &c[i])) {
	break;
      }
    }
    if (i < nComps) {
      break;
    }
    if (nVerticesA == vertSize) {
      vertSize = (vertSize == 0) ? 16 : 2 * vertSize;
      verticesA = (GfxGouraudVertex *)
	              greallocn(verticesA, vertSize, sizeof(GfxGouraudVertex));
    }
    verticesA[nVerticesA].x = xMin + xMul * (double)x;
    verticesA[nVerticesA].y = yMin + yMul * (double)y;
    for (i = 0; i < nComps; ++i) {
      verticesA[nVerticesA].color.c[i] =
	  dblToCol(cMin[i] + cMul[i] * (double)c[i]);
    }
    ++nVerticesA;
    bitBuf->flushBits();
    if (typeA == 4) {
      if (state == 0 || state == 1) {
	++state;
      } else if (state == 2 || flag > 0) {
	if (nTrianglesA == triSize) {
	  triSize = (triSize == 0) ? 16 : 2 * triSize;
	  trianglesA = (int (*)[3])
	                   greallocn(trianglesA, triSize * 3, sizeof(int));
	}
	if (state == 2) {
	  trianglesA[nTrianglesA][0] = nVerticesA - 3;
	  trianglesA[nTrianglesA][1] = nVerticesA - 2;
	  trianglesA[nTrianglesA][2] = nVerticesA - 1;
	  ++state;
	} else if (flag == 1) {
	  trianglesA[nTrianglesA][0] = trianglesA[nTrianglesA - 1][1];
	  trianglesA[nTrianglesA][1] = trianglesA[nTrianglesA - 1][2];
	  trianglesA[nTrianglesA][2] = nVerticesA - 1;
	} else { // flag == 2
	  trianglesA[nTrianglesA][0] = trianglesA[nTrianglesA - 1][0];
	  trianglesA[nTrianglesA][1] = trianglesA[nTrianglesA - 1][2];
	  trianglesA[nTrianglesA][2] = nVerticesA - 1;
	}
	++nTrianglesA;
      } else { // state == 3 && flag == 0
	state = 1;
      }
    }
  }
  delete bitBuf;
  if (typeA == 5) {
    nRows = nVerticesA / vertsPerRow;
    nTrianglesA = (nRows - 1) * 2 * (vertsPerRow - 1);
    trianglesA = (int (*)[3])gmallocn(nTrianglesA * 3, sizeof(int));
    k = 0;
    for (i = 0; i < nRows - 1; ++i) {
      for (j = 0; j < vertsPerRow - 1; ++j) {
	trianglesA[k][0] = i * vertsPerRow + j;
	trianglesA[k][1] = i * vertsPerRow + j+1;
	trianglesA[k][2] = (i+1) * vertsPerRow + j;
	++k;
	trianglesA[k][0] = i * vertsPerRow + j+1;
	trianglesA[k][1] = (i+1) * vertsPerRow + j;
	trianglesA[k][2] = (i+1) * vertsPerRow + j+1;
	++k;
      }
    }
  }

  shading = new GfxGouraudTriangleShading(typeA, verticesA, nVerticesA,
					  trianglesA, nTrianglesA,
					  funcsA, nFuncsA);
  if (!shading->init(dict)) {
    delete shading;
    return NULL;
  }
  return shading;

 err2:
  obj1.free();
 err1:
  return NULL;
}

GfxShading *GfxGouraudTriangleShading::copy() {
  return new GfxGouraudTriangleShading(this);
}

void GfxGouraudTriangleShading::getTriangle(
				    int i,
				    double *x0, double *y0, GfxColor *color0,
				    double *x1, double *y1, GfxColor *color1,
				    double *x2, double *y2, GfxColor *color2) {
  double in;
  double out[gfxColorMaxComps];
  int v, j;

  v = triangles[i][0];
  *x0 = vertices[v].x;
  *y0 = vertices[v].y;
  if (nFuncs > 0) {
    in = colToDbl(vertices[v].color.c[0]);
    for (j = 0; j < nFuncs; ++j) {
      funcs[j]->transform(&in, &out[j]);
    }
    for (j = 0; j < gfxColorMaxComps; ++j) {
      color0->c[j] = dblToCol(out[j]);
    }
  } else {
    *color0 = vertices[v].color;
  }
  v = triangles[i][1];
  *x1 = vertices[v].x;
  *y1 = vertices[v].y;
  if (nFuncs > 0) {
    in = colToDbl(vertices[v].color.c[0]);
    for (j = 0; j < nFuncs; ++j) {
      funcs[j]->transform(&in, &out[j]);
    }
    for (j = 0; j < gfxColorMaxComps; ++j) {
      color1->c[j] = dblToCol(out[j]);
    }
  } else {
    *color1 = vertices[v].color;
  }
  v = triangles[i][2];
  *x2 = vertices[v].x;
  *y2 = vertices[v].y;
  if (nFuncs > 0) {
    in = colToDbl(vertices[v].color.c[0]);
    for (j = 0; j < nFuncs; ++j) {
      funcs[j]->transform(&in, &out[j]);
    }
    for (j = 0; j < gfxColorMaxComps; ++j) {
      color2->c[j] = dblToCol(out[j]);
    }
  } else {
    *color2 = vertices[v].color;
  }
}

//------------------------------------------------------------------------
// GfxPatchMeshShading
//------------------------------------------------------------------------

GfxPatchMeshShading::GfxPatchMeshShading(int typeA,
					 GfxPatch *patchesA, int nPatchesA,
					 Function **funcsA, int nFuncsA):
  GfxShading(typeA)
{
  int i;

  patches = patchesA;
  nPatches = nPatchesA;
  nFuncs = nFuncsA;
  for (i = 0; i < nFuncs; ++i) {
    funcs[i] = funcsA[i];
  }
}

GfxPatchMeshShading::GfxPatchMeshShading(GfxPatchMeshShading *shading):
  GfxShading(shading)
{
  int i;

  nPatches = shading->nPatches;
  patches = (GfxPatch *)gmallocn(nPatches, size