BitmapObject.cpp

#include "BitmapObject.h"

BitMapObject::BitMapObject() {
	hdcMemory = NULL;
	hbmNewBitMap = NULL;
	hbmOldBitMap = NULL;
	iWidth = 0;
	iHeight = 0;
}

BitMapObject::~BitMapObject() {
	//if hdcMemory hasn't yet been destroyed, do so
	if (hdcMemory)
		BitMapObject::Destroy();
}

void BitMapObject::Load(HDC hdcCompatible, LPCWSTR lpszFileName) {
	//if hdcMemory isn't null, make it so
	if (hdcMemory)
		BitMapObject::Destroy();

	//create memory dc
	hdcMemory = CreateCompatibleDC(hdcCompatible);
	
	//load the bitmap
	hbmNewBitMap = (HBITMAP)LoadImage(NULL, lpszFileName, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
	
	//shove the image into the dc
	hbmOldBitMap = (HBITMAP)SelectObject(hdcMemory, hbmNewBitMap);
	
	//grab the bitmap's properties
	BITMAP bmp;
	GetObject(hbmNewBitMap, sizeof(BITMAP), (LPVOID)&bmp);
	
	//grab the width and height
	iWidth = bmp.bmWidth;
	iHeight = bmp.bmHeight;

}

void BitMapObject::Create(HDC hdcCompatible, int width, int height) {
	//if hdcMemory isnt null, make it so
	if (hdcMemory)
		BitMapObject::Destroy();

	//create the memory dc
	hdcMemory = CreateCompatibleDC(hdcCompatible);

	//create the bitmap
	hbmNewBitMap = CreateCompatibleBitmap(hdcCompatible, width, height);

	//shove the image into the dc
	hbmOldBitMap = (HBITMAP)SelectObject(hdcMemory, hbmNewBitMap);

	//change the width and height
	iWidth = width;
	iHeight = height;
}

void BitMapObject::Destroy() {
	
	//restore old bitmap
	SelectObject(hdcMemory, hbmOldBitMap);

	//delete new bitmap
	DeleteObject(hbmNewBitMap);

	//delete the device context
	DeleteDC(hdcMemory);

	//set members to 0/NULL
	hdcMemory = NULL;
	hbmNewBitMap = NULL;
	hbmOldBitMap = NULL;
	iWidth = 0;
	iHeight = 0;

}

BitMapObject::operator HDC() {
	
	//return hdcMemory
	return(hdcMemory);
}

int BitMapObject::GetWidth() {

	// return width
	return iWidth;
}

int BitMapObject::GetHeight() {

	// return height
	return iHeight;

}