axmol/cocos2dx/platform/uphone/UIImage.cpp

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

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#include "UIImage.h"

#include <ImageToolKit/IT_ImageLoader.h> 
#include <TG3.h>

using namespace ImageToolKit;
using namespace std;

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

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

}

UIImage::~UIImage(void)
{
	if (m_pBitmap)
	{
		m_pBitmap->Destroy();
	}
}

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

	// load the image

	ImageLoader obImgLoader;
    Image       obImg;
	TUChar *pszPath = new TUChar[strPath.size() + 1];
    TUString::StrGBToUnicode(pszPath, (const Char *) strPath.c_str());
    bool bRet = false;

	do
	{
		// check if the loading action is successful
		if (! obImgLoader.loadImage(obImg, pszPath, IT_LOAD_FMT_UNKNOWN))
		{
			bRet = false;
			break;
		}

		// init bitmap
		m_pBitmap = (TBitmap *) obImg.GetTBitmap();
		m_pBitmap = m_pBitmap->DupBitmapTo32();

		// the hight is 0??
		if (m_pBitmap && m_pBitmap->GetHeight() == 0)
		{
			m_pBitmap->Destroy();
			m_pBitmap = NULL;

			bRet = false;
			break;
		}

		if (m_pBitmap)
		{
			bRet = true;
		}
		else
		{
			bRet = false;
		}
	} while(0);

	delete[] pszPath;
	return bRet;
}

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;
}

// now, uphone only support premultiplied data
// so, we only return true
bool UIImage::isPremultipliedAlpha(void)
{
	return true;
}

// 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 -> it is a mask
// 1 -> other
int UIImage::CGImageGetColorSpace(void)
{
	int nRet = 1;

	if (m_pBitmap->GetRowBytes() == 1)
	{
		nRet = 0;
	}

	return nRet;
}

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

	do {
		const TBitmap *pBitmap;
		int nW;
		int nH;
		UINT8 uR;
		UINT8 uB;
		
        // 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);

		// translate BGRA to RGBA
        for (int i = 0; i < nW; ++i)
		{
			for (int j = 0; j < nH; ++j)
			{
				int baseAddr = (j * nW + i) * 4;

				uB = pBufferRet[baseAddr];
				uR = pBufferRet[baseAddr + 2];

				pBufferRet[baseAddr] = uR;
				pBufferRet[baseAddr + 2] = uB;
			}
		}
	} while(0);

	return pBufferRet;
}