vtkTextRendererStringToImage.h 3.26 KB
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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkTextRendererStringToImage.h

  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.

=========================================================================*/

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/**
 * @class   vtkTextRendererStringToImage
 * @brief   uses vtkTextRenderer to render the
 * supplied text to an image.
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 */
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#ifndef vtkTextRendererStringToImage_h
#define vtkTextRendererStringToImage_h
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#include "vtkRenderingFreeTypeModule.h" // For export macro
#include "vtkStringToImage.h"

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class VTKRENDERINGFREETYPE_EXPORT vtkTextRendererStringToImage : public vtkStringToImage
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{
public:
  vtkTypeMacro(vtkTextRendererStringToImage, vtkStringToImage);
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  void PrintSelf(ostream& os, vtkIndent indent) override;
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  static vtkTextRendererStringToImage* New();
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  //@{
  /**
   * Given a text property and a string, get the bounding box [xmin, xmax] x
   * [ymin, ymax]. Note that this is the bounding box of the area
   * where actual pixels will be written, given a text/pen/baseline location
   * of (0,0).
   * For example, if the string starts with a 'space', or depending on the
   * orientation, you can end up with a [-20, -10] x [5, 10] bbox (the math
   * to get the real bbox is straightforward).
   * Return 1 on success, 0 otherwise.
   * You can use IsBoundingBoxValid() to test if the computed bbox
   * is valid (it may not if GetBoundingBox() failed or if the string
   * was empty).
   */
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  vtkVector2i GetBounds(
    vtkTextProperty* property, const vtkUnicodeString& string, int dpi) override;
  vtkVector2i GetBounds(vtkTextProperty* property, const vtkStdString& string, int dpi) override;
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  //@}

  //@{
  /**
   * Given a text property and a string, this function initializes the
   * vtkImageData *data and renders it in a vtkImageData. textDims, if provided,
   * will be overwritten by the pixel width and height of the rendered string.
   * This is useful when ScaleToPowerOfTwo is true, and the image dimensions may
   * not match the dimensions of the rendered text.
   */
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  int RenderString(vtkTextProperty* property, const vtkUnicodeString& string, int dpi,
    vtkImageData* data, int textDims[2] = nullptr) override;
  int RenderString(vtkTextProperty* property, const vtkStdString& string, int dpi,
    vtkImageData* data, int textDims[2] = nullptr) override;
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  //@}
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  /**
   * Should we produce images at powers of 2, makes rendering on old OpenGL
   * hardware easier. Default is false.
   */
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  void SetScaleToPowerOfTwo(bool scale) override;
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  /**
   * Make a deep copy of the supplied utility class.
   */
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  void DeepCopy(vtkTextRendererStringToImage* utility);
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protected:
  vtkTextRendererStringToImage();
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  ~vtkTextRendererStringToImage() override;
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  class Internals;
  Internals* Implementation;

private:
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  vtkTextRendererStringToImage(const vtkTextRendererStringToImage&) = delete;
  void operator=(const vtkTextRendererStringToImage&) = delete;
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};

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#endif // vtkTextRendererStringToImage_h