axmol/cocos2dx/platform/uphone/UIImage.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

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#include "UIImage.h"

#include <TG3.h>

using namespace std;

UIImage::UIImage(void)
{
	m_pBitmap = NULL;
}

UIImage::UIImage(int nX, int nY, void *buffer)
{

}

UIImage::~UIImage(void)
{
}

bool UIImage::initWithContentsOfFile(const string &strPath)
{
	if (m_pBitmap)
	{
		return false;
	}

	m_pBitmap = TBitmap::CreateFromFile((TUChar *)(strPath.c_str()));

	if (m_pBitmap && m_pBitmap->GetHeight() == 0)
	{
		m_pBitmap = NULL;

		return false;
	}

	if (m_pBitmap)
	{
		return true;
	}
	else
	{
		return false;
	}
}

unsigned int UIImage::width(void)
{
	if (! m_pBitmap)
	{
		return 0;
	}

	return m_pBitmap->GetWidth();
}

unsigned int UIImage::height(void)
{
	if (! m_pBitmap)
	{
		return 0;
	}

	return m_pBitmap->GetHeight();
}

bool UIImage::isAlphaPixelFormat(void)
{
	if (! m_pBitmap)
	{
		return false;
	}

	bool bRet;
	if (m_pBitmap->HasAlphaData())
	{
        bRet = true;
	}
	else
	{
		bRet = false;
	}

	return bRet;
}

// compute how many bits every color component 
int UIImage::CGImageGetBitsPerComponent(void)
{
	if (! m_pBitmap)
	{
		return 0;
	}

	int nRet = 0;
	int nRowBytes = m_pBitmap->GetRowBytes();
	if (m_pBitmap->HasAlphaData())
	{
		// it has alpha data, so
		// nRawBytes / 4 -> the bytes of per component
		nRet = nRowBytes / 4 * 8;
	}
	else
	{
		// have not alpha data
		// nRawBytes / 3 -> the bytes of per component
		nRet = nRowBytes / 3 * 8;
	}

	return nRet;
}

// 0 -> the bits of every color component is 8
// 1 -> other
int UIImage::CGImageGetColorSpace(void)
{
	int nRet = 1;

	if (CGImageGetBitsPerComponent() == 8)
	{
		nRet = 0;
	}

	return nRet;
}

UINT8* UIImage::getRGBA8888Data(void)
{
	UINT8 *pBufferRet = NULL;

	do {
		const TBitmap *pBitmap;
		int nW;
		int nH;
		
        // convert to RGBA8888 format
		pBitmap = m_pBitmap->DupBitmapTo32();
		if (pBitmap == NULL)
		{
			break;
		}

		// compute width and height
		nW = pBitmap->GetWidth();
		nH = pBitmap->GetHeight();

		// alloc memory and store the bitmap data
		pBufferRet = new UINT8(nW * nH * 4);
		memcpy(pBufferRet, pBitmap->GetDataPtr(), nW * nH * 4);
	} while(0);

	return pBufferRet;
}