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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLGL2PSExporter.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkOpenGLGL2PSExporter.h"
#include "vtkImageData.h"
#include "vtkImageShiftScale.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLGL2PSHelper.h"
#include "vtkRenderWindow.h"
#include "vtkWindowToImageFilter.h"
#include "vtk_gl2ps.h"
#include <algorithm>
#include <cstdio>
#include <sstream>
#include <string>
vtkStandardNewMacro(vtkOpenGLGL2PSExporter)
//------------------------------------------------------------------------------
void vtkOpenGLGL2PSExporter::PrintSelf(std::ostream &os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
vtkOpenGLGL2PSExporter::vtkOpenGLGL2PSExporter()
{
}
//------------------------------------------------------------------------------
vtkOpenGLGL2PSExporter::~vtkOpenGLGL2PSExporter()
{
}
//------------------------------------------------------------------------------
void vtkOpenGLGL2PSExporter::WriteData()
{
// Open file:
if (this->FilePrefix == NULL)
{
vtkErrorMacro(<< "Please specify a file prefix to use");
return;
}
std::ostringstream fname;
fname << this->FilePrefix << "." << this->GetFileExtension();
if (this->Compress)
{
fname << ".gz";
}
FILE *file = fopen(fname.str().c_str(), "wb");
if (!file)
{
vtkErrorMacro("Unable to open file: " << fname.str());
return;
}
// Setup information that GL2PS will need to export the scene:
std::string title = (this->Title && this->Title[0]) ? this->Title
: "VTK GL2PS Export";
GLint options = static_cast<GLint>(this->GetGL2PSOptions());
GLint sort = static_cast<GLint>(this->GetGL2PSSort());
GLint format = static_cast<GLint>(this->GetGL2PSFormat());
int *winsize = this->RenderWindow->GetSize();
GLint viewport[4] = {0, 0, static_cast<GLint>(winsize[0]),
static_cast<GLint>(winsize[1])};
// Setup helper class:
vtkNew<vtkOpenGLGL2PSHelper> gl2ps;
gl2ps->SetInstance(gl2ps.GetPointer());
gl2ps->SetTextAsPath(this->TextAsPath);
gl2ps->SetRenderWindow(this->RenderWindow);
// Grab the image background:
vtkNew<vtkImageData> background;
if (!this->RasterizeBackground(background.GetPointer()))
{
vtkErrorMacro("Error rasterizing background image. Exported image may be "
"incorrect.");
background->Initialize();
// Continue with export.
}
// Fixup options for no-opengl-context GL2PS rendering (we don't use the
// context since we inject all geometry manually):
options |= GL2PS_NO_OPENGL_CONTEXT | GL2PS_NO_BLENDING;
// Print warning if the user requested no background -- we always draw it.
if ((options & GL2PS_DRAW_BACKGROUND) == GL2PS_NONE)
{
vtkWarningMacro("Ignoring DrawBackground=false setting. The background is "
"always drawn on the OpenGL2 backend for GL2PS exports.");
}
// Turn the option off -- we don't want GL2PS drawing the background, it
// comes from the raster image we draw in the image.
options &= ~GL2PS_DRAW_BACKGROUND;
// Export file. No worries about buffersize, since we're manually adding
// geometry through vtkOpenGLGL2PSHelper::ProcessTransformFeedback.
GLint err = gl2psBeginPage(title.c_str(), "VTK", viewport, format, sort,
options, GL_RGBA, 0, NULL, 0, 0, 0, 0, file,
fname.str().c_str());
if (err != GL2PS_SUCCESS)
{
vtkErrorMacro("Error calling gl2psBeginPage. Error code: " << err);
gl2ps->SetInstance(NULL);
fclose(file);
return;
}
if (background->GetNumberOfPoints() > 0)
{
int dims[3];
background->GetDimensions(dims);
GL2PSvertex rasterPos;
rasterPos.xyz[0] = 0.f;
rasterPos.xyz[1] = 0.f;
rasterPos.xyz[2] = 1.f;
std::fill(rasterPos.rgba, rasterPos.rgba + 4, 0.f);
gl2psForceRasterPos(&rasterPos);
gl2psDrawPixels(dims[0], dims[1], 0, 0, GL_RGB, GL_FLOAT,
background->GetScalarPointer());
background->ReleaseData();
}
// Render the scene:
if (!this->CaptureVectorProps())
{
vtkErrorMacro("Error capturing vectorizable props. Resulting image "
"may be incorrect.");
}
// Cleanup
err = gl2psEndPage();
gl2ps->SetInstance(NULL);
fclose(file);
switch (err)
{
case GL2PS_SUCCESS:
break;
case GL2PS_NO_FEEDBACK:
vtkErrorMacro("No data captured by GL2PS for vector graphics export.");
break;
default:
vtkErrorMacro("Error calling gl2psEndPage. Error code: " << err);
break;
}
// Re-render the window to remove any lingering after-effects...
this->RenderWindow->Render();
}
bool vtkOpenGLGL2PSExporter::RasterizeBackground(vtkImageData *image)
{
vtkNew<vtkWindowToImageFilter> windowToImage;
windowToImage->SetInput(this->RenderWindow);
windowToImage->SetInputBufferTypeToRGB();
windowToImage->SetReadFrontBuffer(false);
vtkNew<vtkImageShiftScale> byteToFloat;
byteToFloat->SetOutputScalarTypeToFloat();
byteToFloat->SetScale(1.0 / 255.0);
byteToFloat->SetInputConnection(windowToImage->GetOutputPort());
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
gl2ps->SetActiveState(vtkOpenGLGL2PSHelper::Background);
// Render twice to set the backbuffer:
this->RenderWindow->Render();
this->RenderWindow->Render();
byteToFloat->Update();
gl2ps->SetActiveState(vtkOpenGLGL2PSHelper::Inactive);
image->ShallowCopy(byteToFloat->GetOutput());
return true;
}
bool vtkOpenGLGL2PSExporter::CaptureVectorProps()
{
vtkOpenGLGL2PSHelper *gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
gl2ps->SetActiveState(vtkOpenGLGL2PSHelper::Capture);
this->RenderWindow->Render();
gl2ps->SetActiveState(vtkOpenGLGL2PSHelper::Inactive);
return true;
}
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