Method FillTexture

IO/ExportPDF/vtkPDFContextDevice2D.cxx:1791–1854

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//------------------------------------------------------------------------------
void vtkPDFContextDevice2D::FillTexture()
{
  assert(this->IsInTexturedFill);

  this->IsInTexturedFill = false;

  if (this->TextureBounds[0] == VTK_FLOAT_MAX || this->TextureBounds[1] == VTK_FLOAT_MIN ||
    this->TextureBounds[2] == VTK_FLOAT_MAX || this->TextureBounds[3] == VTK_FLOAT_MIN)
  { // No geometry to texture:
    this->PopGraphicsState();
    return;
  }

  // Use current path for clipping
  HPDF_Page_Clip(this->Impl->Page);
  HPDF_Page_EndPath(this->Impl->Page);

  // Prepare texture image
  vtkImageData* image = this->Brush->GetTexture();
  assert(image);

  vtkImageData* rgb = this->PrepareImageData(image);
  if (!rgb)
  {
    return;
  }

  assert(rgb->GetScalarType() == VTK_UNSIGNED_CHAR);
  assert(rgb->GetNumberOfScalarComponents() == 3);

  int dims[3];
  rgb->GetDimensions(dims);
  const HPDF_BYTE* buf = static_cast<HPDF_BYTE*>(rgb->GetScalarPointer());

  HPDF_Image pdfImage =
    HPDF_LoadRawImageFromMem(this->Impl->Document, buf, dims[0], dims[1], HPDF_CS_DEVICE_RGB, 8);

  const bool isTiled = ((this->Brush->GetTextureProperties() & vtkBrush::Repeat) != 0);

  // tile across TextureBounds if repeating
  if (isTiled)
  {
    float x = this->TextureBounds[0];
    while (x < this->TextureBounds[1])
    {
      float y = this->TextureBounds[2];
      while (y < this->TextureBounds[3])
      {
        HPDF_Page_DrawImage(this->Impl->Page, pdfImage, x, y, dims[0], dims[1]);
        y += dims[1];
      }
      x += dims[0];
    }
  }
  else
  { // stretch across texture bounds if stretched
    HPDF_Page_DrawImage(this->Impl->Page, pdfImage, this->TextureBounds[0], this->TextureBounds[2],
      this->TextureBounds[1] - this->TextureBounds[0],