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#include "Bitmap.h"

Bitmap::Bitmap()

{

}

Bitmap::~Bitmap()

{

// Ensure we clean up any existing bitmap

DeleteBitmap();

}

// Create a new bitmap of the specified width and height, deleting any existing bitmap

//

// Returns value of false if bitmap cannot be created.

bool Bitmap::Create(HWND hWnd, unsigned int width, unsigned int height)

{

bool status = false;

HDC hDc;

// Delete any existing bitmap

DeleteBitmap();

// Create a device context compatible with the window device context

hDc = ::GetDC(hWnd);

_width = width;

_height = height;

_hMemDC = CreateCompatibleDC(hDc);

if (_hMemDC != 0)

{

// Create a bitmap compatible with the window

_hBitmap = CreateCompatibleBitmap(hDc, _width, _height);

if (_hBitmap != 0)

{

// Select the bitmap into the new device context, saving any old bitmap handle

_hOldBitmap = static_cast<HBITMAP>(SelectObject(_hMemDC, _hBitmap));

status = true;

}

}

// Release the device context for the window

ReleaseDC(hWnd, hDc);

return status;

}

// Return device context of bitmap

HDC Bitmap::GetDC() const

{

return _hMemDC;

}

// Return width of bitmap

unsigned int Bitmap::GetWidth() const

{

return _width;

}

// Return height of bitmap

unsigned int Bitmap::GetHeight() const

{

return _height;

}

// Delete any existing bitmap

void Bitmap::DeleteBitmap()

{

// Select any default bitmap that existed for the device context

if (_hOldBitmap != 0 && _hMemDC != 0)

{

SelectObject(_hMemDC, _hOldBitmap);

_hOldBitmap = 0;

}

// Delete any existing bitmap

if (_hBitmap != 0)

{

DeleteObject(_hBitmap);

_hBitmap = 0;

}

// Delete any existing bitmap device context

if (_hMemDC != 0)

{

DeleteDC(_hMemDC);

_hMemDC = 0;

}

}

// Clear bitmap using the specified brush

void Bitmap::Clear(HBRUSH hBrush) const

{

RECT rect;

rect.left = 0;

rect.right = _width;

rect.top = 0;

rect.bottom = _height;

FillRect(_hMemDC, &rect, hBrush);

}

// Clear bitmap using the specified colour

void Bitmap::Clear(COLORREF colour) const

{

HBRUSH brush = CreateSolidBrush(colour);

Clear(brush);

DeleteObject(brush);

}