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>
#include "png.h"

//using namespace ImageToolKit;
using namespace std;
namespace   cocos2d {

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;
	}

    bool bRet = false;
	do
	{
        // load the image
/************************************************************************/
/*                   Use ImageToolKit load image                        */
// 	    ImageLoader obImgLoader;
//      Image       obImg;
// 	    TUChar *pszPath = new TUChar[strPath.size() + 1];
//      TUString::StrGBToUnicode(pszPath, (const Char *) strPath.c_str());
// 		if (! obImgLoader.loadImage(obImg, pszPath, IT_LOAD_FMT_UNKNOWN))
// 		{
// 			bRet = false;
// 			break;
// 		}
// 
// 		// init bitmap
// 		m_pBitmap = (TBitmap *) obImg.GetTBitmap();
// 		m_pBitmap = m_pBitmap->DupBitmapTo32();
//      delete[] pszPath;
/************************************************************************/

        // use libpng load image
        bRet = loadPng(strPath.c_str());

        // check if the loading action is successful
        if (! bRet)
        {
            break;
        }

		// 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);

	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;
		
        if (m_pBitmap == NULL)
        {
            break;
        }

        // 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;
}

bool UIImage::loadPng(const char* strFileName)
{
    char                header[8]; 
    FILE                *fp;
    png_structp         png_ptr;
    png_infop           info_ptr;
    UInt32               * pBmpData;
    Int32               pos;
    Int32               bitDepth;
    png_uint_32         width;
    png_uint_32         height;
    Int32               interlaceType;
    png_bytep           * rowPointers;
    Int32               colorType;

    pos = 0;
    fp = NULL;
    pBmpData = NULL;

    // open file
    fp = fopen(strFileName, "rb");
    if (!fp)
        return false;

    // read 8 bytes from the beginning of the file
    fread(header, 1, 8, fp); 

    // close the file if it's not a png
    if (png_sig_cmp((png_bytep)header, 0, 8))
    {
        fclose(fp);
        return false;
    }

    // init png_struct
    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (!png_ptr)
    {
        fclose(fp);
        return false;
    }   

    // init png_info
    info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr)
    {
        png_destroy_read_struct(&png_ptr, NULL, NULL);
        fclose(fp);
        return false;
    }

    // if something wrong,close file and return
    if (setjmp(png_jmpbuf(png_ptr)))
    {       
        png_destroy_read_struct(&png_ptr, NULL, NULL);
        png_destroy_info_struct(png_ptr, &info_ptr);
        fclose(fp);
        return false;
    }

    // conect the file pointer to libpng
    png_init_io(png_ptr, fp);
    png_set_sig_bytes(png_ptr, 8);

    // read the data of the file
    png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_EXPAND, 0);

    png_get_IHDR(png_ptr, info_ptr, &m_width, &m_height, &m_bitDepth, &m_colorType,
        &m_interlaceType, NULL, NULL);

    if (setjmp(png_jmpbuf(png_ptr)))
    {     
        png_destroy_read_struct(&png_ptr, NULL, NULL);
        png_destroy_info_struct(png_ptr, &info_ptr);
        fclose(fp);
        return false;
    }

    // get the image file data
    m_rowPointers = png_get_rows(png_ptr, info_ptr);

    // Create a bitmap of 32bits depth
    if(!m_pBitmap)
    {
        m_pBitmap = TBitmap::Create(m_width, m_height, 32);
    }
    if(!m_pBitmap)
    {
        png_destroy_read_struct(&png_ptr, NULL, NULL);
        png_destroy_info_struct(png_ptr, &info_ptr);
        fclose(fp);
        return false; 
    }

    // Alpha data
    pBmpData = reinterpret_cast< UInt32* >( m_pBitmap->GetDataPtr() );

    if( info_ptr->color_type & PNG_COLOR_MASK_ALPHA )
    {
        for(int i = 0; i < m_height; i++)
        {
            for(int j = 0; j < (4 * m_width); j += 4)
            {
                *pBmpData++ = RGBA( m_rowPointers[i][j], m_rowPointers[i][j + 1], 
                    m_rowPointers[i][j + 2], m_rowPointers[i][j + 3] );
            }
        }
    }
    else
    {
        for(int i = 0; i < m_height; i++)
        {
            for(int j = 0; j < (3 * m_width); j += 3)
            {
                *pBmpData++ = RGB( m_rowPointers[i][j], m_rowPointers[i][j + 1], 
                    m_rowPointers[i][j + 2] );
            }
        }
    }

    // release
    png_destroy_read_struct(&png_ptr, NULL, NULL);
    png_destroy_info_struct(png_ptr, &info_ptr);
    fclose(fp);

    return true;
}
}//namespace   cocos2d