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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkPNGReader
* @brief read PNG files
*
* vtkPNGReader is a source object that reads PNG files.
* It should be able to read most any PNG file
*
* @sa
* vtkPNGWriter
*/
#ifndef vtkPNGReader_h
#define vtkPNGReader_h
#include "vtkIOImageModule.h" // For export macro
#include "vtkImageReader2.h"
#include "vtkSmartPointer.h" // For vtkSmartPointer
VTK_ABI_NAMESPACE_BEGIN
class vtkStringArray;
VTK_ABI_NAMESPACE_END
VTK_ABI_NAMESPACE_BEGIN
class VTKIOIMAGE_EXPORT vtkPNGReader : public vtkImageReader2
{
public:
static vtkPNGReader* New();
vtkTypeMacro(vtkPNGReader, vtkImageReader2);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Is the given file a PNG file?
*/
int CanReadFile(VTK_FILEPATH const char* fname) override;
/**
* Get the file extensions for this format.
* Returns a string with a space separated list of extensions in
* the format .extension
*/
const char* GetFileExtensions() override { return ".png"; }
/**
* Return a descriptive name for the file format that might be useful in a GUI.
*/
const char* GetDescriptiveName() override { return "PNG"; }
/**
* Given a 'key' for the text chunks, fills in 'beginEndIndex'
* with the begin and end indexes. Values are stored between
* [begin, end) indexes.
*/
void GetTextChunks(const char* key, int beginEndIndex[2]);
///@{
/**
* Returns the text key stored at 'index'.
*/
const char* GetTextKey(int index);
vtkStringArray* GetTextKeys();
///@}
///@{
/**
* Returns the text value stored at 'index'. A range of indexes
* that store values for a certain key can be obtained by calling
* GetTextChunks.
*/
const char* GetTextValue(int index);
vtkStringArray* GetTextValues();
///@}
/**
* Return the number of text chunks in the PNG file.
* Note that we don't process compressed or international text entries
*/
size_t GetNumberOfTextChunks();
///@{
/**
* Set/Get if data spacing should be calculated from the PNG file.
* Use default spacing if the PNG file don't have valid pixel per meter parameters.
* Default is false.
*/
vtkSetMacro(ReadSpacingFromFile, bool);
vtkGetMacro(ReadSpacingFromFile, bool);
vtkBooleanMacro(ReadSpacingFromFile, bool);
///@}
protected:
vtkPNGReader();
~vtkPNGReader() override;
void ExecuteInformation() override;
void ExecuteDataWithInformation(vtkDataObject* out, vtkInformation* outInfo) override;
template <class OT>
void vtkPNGReaderUpdate(vtkImageData* data, OT* outPtr);
template <class OT>
void vtkPNGReaderUpdate2(OT* outPtr, int* outExt, vtkIdType* outInc, long pixSize);
private:
vtkPNGReader(const vtkPNGReader&) = delete;
void operator=(const vtkPNGReader&) = delete;
class vtkInternals;
vtkInternals* Internals;
bool ReadSpacingFromFile;
};
VTK_ABI_NAMESPACE_END
#endif
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