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Header file:
class Factory;
class IRenderingInformation
{
public:
virtual Factory& getFactory() const = 0;
virtual unsigned int getColor() const = 0;
virtual ~IRenderingInformation() = default;
};
class Factory final
{
private:
Factory() = delete;
Factory(const Factory&) = delete;
Factory(Factory&&) = delete;
Factory& operator=(const Factory&) = delete;
Factory& operator=(Factory&&) = delete;
public:
typedef Object::VectorType VectorType;
typedef Object::PointType PointType;
typedef IRenderingInformation RenderingInformation;
typedef uint8_t Byte;
Factory(unsigned int width, unsigned int height, const VectorType& extents);
~Factory();
Object* createPoint(const PointType& center,
unsigned color, float depth = 1);
void writeToBitmap(const char* name);
static char* readFromBitmap(unsigned int& width, unsigned int& height,
const char* name);
static unsigned getColor(Byte r, Byte g, Byte b);
POINT toDevice(const VectorType& v) const;
HDC getContext() const;
private:
HBITMAP _bitmap;
HDC _context;
unsigned int _width;
unsigned int _height;
void* _bitmapData;
float _xFactor;
float _yFactor;
};
cpp file:
namespace
{
const unsigned char BYTES_PER_PIXEL = 3;
}
class RenderedPoint : public Point, public IRenderingInformation
{
public:
void render() const override;
// What do I need to do here?
};
Factory::Factory(
unsigned int width,
unsigned int height,
const VectorType& extents
) :
_width{width},
_height{height},
_xFactor{static_cast<float>(width) / extents.x()},
_yFactor{static_cast<float>(height) / extents.y()}
{
_context = CreateCompatibleDC(0);
BITMAPINFO bitmapInfo;
ZeroMemory(&bitmapInfo, sizeof(bitmapInfo));
bitmapInfo.bmiHeader.biSize = sizeof(bitmapInfo);
bitmapInfo.bmiHeader.biWidth = width;
bitmapInfo.bmiHeader.biHeight = height;
bitmapInfo.bmiHeader.biPlanes = 1;
bitmapInfo.bmiHeader.biBitCount = 24;
bitmapInfo.bmiHeader.biCompression = BI_RGB;
_bitmap = CreateDIBSection(_context, &bitmapInfo, DIB_RGB_COLORS,
&_bitmapData, 0, 0
);
SelectObject(_context, _bitmap);
}
Factory::~Factory()
{
HGDIOBJ old = SelectObject(_context, GetStockObject(NULL_BRUSH));
DeleteObject(old);
DeleteDC(_context);
DeleteObject(_bitmap);
}
HDC Factory::getContext() const
{
return _context;
}
unsigned Factory::getColor(Byte r, Byte g, Byte b)
{
return RGB(r, g, b);
}
void Factory::writeToBitmap(const char* name)
{
const unsigned int rowData = BYTES_PER_PIXEL * _width;
const unsigned int rowPadding = (rowData % 4 != 0)
? (4 - rowData % 4)
: 0;
const unsigned int stride = rowData + rowPadding;
std::fstream out{name, std::ios_base::binary | std::ios_base::out};
if (out)
{
BITMAPFILEHEADER bmfh;
BITMAPINFOHEADER bmih;
ZeroMemory(&bmfh, sizeof(bmfh));
bmfh.bfType = 'B' + ('M' << 8);
bmfh.bfSize = static_cast<unsigned int>(
sizeof(bmfh) +
sizeof(bmih) +
stride * _height
);
bmfh.bfOffBits = sizeof(bmfh) + sizeof(bmih);
out.write(reinterpret_cast<char*>(&bmfh), sizeof(bmfh));
ZeroMemory(&bmih, sizeof(bmih));
bmih.biSize = sizeof(bmih);
bmih.biWidth = _width;
bmih.biHeight = _height;
bmih.biPlanes = 1;
bmih.biBitCount = 8 * BYTES_PER_PIXEL;
bmih.biCompression = BI_RGB;
out.write(reinterpret_cast<char*>(&bmih), sizeof(bmih));
for (unsigned int h = 0; h < _height; ++h)
{
out.write(
reinterpret_cast<char*>(_bitmapData) + h * stride,
rowData
);
if (stride > rowData)
{
out.write("000", stride - rowData);
}
}
}
}
char* Factory::readFromBitmap(unsigned int& width, unsigned int& height,
const char* name
)
{
std::fstream in{name, std::ios_base::in | std::ios_base::binary};
if (in)
{
char header[54];
in.read(header, 54);
width = *reinterpret_cast<unsigned int*>(header + 18);
const int signedHeight = *reinterpret_cast<int*>(header + 22);
height = static_cast<unsigned int>(std::abs(signedHeight));
const unsigned int size = *reinterpret_cast<unsigned int*>(header + 34);
const unsigned int stride = size / height;
const unsigned int rowData = BYTES_PER_PIXEL * width;
char* const data = new char[rowData * height];
for (unsigned int i = 0; i < height; ++i)
{
in.read(data + rowData * i, rowData);
if (stride > rowData)
{
char buffer[4];
in.read(buffer, stride - rowData);
}
}
return data;
}
else
{
return nullptr;
}
}
Object* Factory::createPoint(const PointType& center, unsigned color,
float depth
)
{
return new RenderedPoint(//Unsure about what to write here..);
}
void RenderedPoint::render() const
{
POINT p = getFactory().toDevice(center());
SetPixel(getFactory().getContext(), p.x, p.y, getColor());
}
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