hyperion.ng/include/utils/ImageData.h

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#pragma once
// STL includes
#include <vector>
#include <cstdint>
#include <cstring>
#include <algorithm>
#include <cassert>
#include <type_traits>
#include <utils/ColorRgb.h>
// QT includes
#include <QSharedData>
// https://docs.microsoft.com/en-us/windows/win32/winprog/windows-data-types#ssize-t
#if defined(_MSC_VER)
#include <BaseTsd.h>
typedef SSIZE_T ssize_t;
#endif
template <typename Pixel_T>
class ImageData : public QSharedData
{
public:
typedef Pixel_T pixel_type;
ImageData(const unsigned width, const unsigned height, const Pixel_T background) :
_width(width),
_height(height),
_pixels(new Pixel_T[width * height + 1])
{
std::fill(_pixels, _pixels + width * height, background);
}
ImageData(const ImageData & other) :
QSharedData(other),
_width(other._width),
_height(other._height),
_pixels(new Pixel_T[other._width * other._height + 1])
{
memcpy(_pixels, other._pixels, (long) other._width * other._height * sizeof(Pixel_T));
}
ImageData& operator=(ImageData rhs)
{
rhs.swap(*this);
return *this;
}
void swap(ImageData& s) noexcept
{
using std::swap;
swap(this->_width, s._width);
swap(this->_height, s._height);
swap(this->_pixels, s._pixels);
}
ImageData(ImageData&& src) noexcept
: _width(0)
, _height(0)
, _pixels(NULL)
{
src.swap(*this);
}
ImageData& operator=(ImageData&& src) noexcept
{
src.swap(*this);
return *this;
}
~ImageData()
{
delete[] _pixels;
}
inline unsigned width() const
{
return _width;
}
inline unsigned height() const
{
return _height;
}
uint8_t red(const unsigned pixel) const
{
return (_pixels + pixel)->red;
}
uint8_t green(const unsigned pixel) const
{
return (_pixels + pixel)->green;
}
uint8_t blue(const unsigned pixel) const
{
return (_pixels + pixel)->blue;
}
const Pixel_T& operator()(const unsigned x, const unsigned y) const
{
return _pixels[toIndex(x,y)];
}
Pixel_T& operator()(const unsigned x, const unsigned y)
{
return _pixels[toIndex(x,y)];
}
void resize(const unsigned width, const unsigned height)
{
if (width == _width && height == _height)
return;
if ((width * height) > unsigned((_width * _height)))
{
delete[] _pixels;
_pixels = new Pixel_T[width*height + 1];
}
_width = width;
_height = height;
}
Pixel_T* memptr()
{
return _pixels;
}
const Pixel_T* memptr() const
{
return _pixels;
}
void toRgb(ImageData<ColorRgb>& image)
{
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if (image.width() != _width || image.height() != _height)
image.resize(_width, _height);
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const unsigned imageSize = _width * _height;
for (unsigned idx = 0; idx < imageSize; idx++)
{
const Pixel_T & color = _pixels[idx];
image.memptr()[idx] = ColorRgb{color.red, color.green, color.blue};
}
}
ssize_t size() const
{
return (ssize_t) _width * _height * sizeof(Pixel_T);
}
void clear()
{
if (_width != 1 || _height != 1)
{
_width = 1;
_height = 1;
delete[] _pixels;
_pixels = new Pixel_T[2];
}
memset(_pixels, 0, (unsigned long) _width * _height * sizeof(Pixel_T));
}
private:
inline unsigned toIndex(const unsigned x, const unsigned y) const
{
return y * _width + x;
}
private:
/// The width of the image
unsigned _width;
/// The height of the image
unsigned _height;
/// The pixels of the image
Pixel_T* _pixels;
};