axmol/cocos2dx/platform/CCImageCommon_cpp.h

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

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.

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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#ifndef __CC_PLATFORM_IMAGE_CPP__
#error "CCFileUtilsCommon_cpp.h can only be included for CCFileUtils.cpp in platform/win32(android,...)"
#endif /* __CC_PLATFORM_IMAGE_CPP__ */

#include "CCImage.h"
#include "CCCommon.h"
#include "CCStdC.h"
#include "CCFileUtils.h"
#include "png.h"
#include "jpeglib.h"
#include "tiffio.h"
#include <string>
#include <ctype.h>

#if (CC_TARGET_PLATFORM != CC_PLATFORM_IOS) 

NS_CC_BEGIN

// premultiply alpha, or the effect will wrong when want to use other pixel format in CCTexture2D,
// such as RGB888, RGB5A1
#define CC_RGB_PREMULTIPLY_APLHA(vr, vg, vb, va) \
    (unsigned)(((unsigned)((unsigned char)(vr) * ((unsigned char)(va) + 1)) >> 8) | \
    ((unsigned)((unsigned char)(vg) * ((unsigned char)(va) + 1) >> 8) << 8) | \
    ((unsigned)((unsigned char)(vb) * ((unsigned char)(va) + 1) >> 8) << 16) | \
    ((unsigned)(unsigned char)(va) << 24))

// on ios, we should use platform/ios/CCImage_ios.mm instead

typedef struct 
{
    unsigned char* data;
    int size;
    int offset;
}tImageSource;

static void pngReadCallback(png_structp png_ptr, png_bytep data, png_size_t length)
{
    tImageSource* isource = (tImageSource*)png_get_io_ptr(png_ptr);

    if((int)(isource->offset + length) <= isource->size)
    {
        memcpy(data, isource->data+isource->offset, length);
        isource->offset += length;
    }
    else
    {
        png_error(png_ptr, "pngReaderCallback failed");
    }
}

//////////////////////////////////////////////////////////////////////////
// Impliment CCImage
//////////////////////////////////////////////////////////////////////////

CCImage::CCImage()
: m_nWidth(0)
, m_nHeight(0)
, m_nBitsPerComponent(0)
, m_pData(0)
, m_bHasAlpha(false)
, m_bPreMulti(false)
{

}

CCImage::~CCImage()
{
    CC_SAFE_DELETE_ARRAY(m_pData);
}

bool CCImage::initWithImageFile(const char * strPath, EImageFormat eImgFmt/* = eFmtPng*/)
{
    CC_UNUSED_PARAM(eImgFmt);
    
    unsigned long nSize;
    unsigned char *pBuffer = CCFileUtils::sharedFileUtils()->getFileData(CCFileUtils::sharedFileUtils()->fullPathFromRelativePath(strPath), "rb", &nSize);
    
    return initWithImageData(pBuffer, nSize, eImgFmt);
}

bool CCImage::initWithImageFileThreadSafe(const char *fullpath, EImageFormat imageType)
{
    CC_UNUSED_PARAM(imageType);

    unsigned long nSize;
    unsigned char *pBuffer = CCFileUtils::sharedFileUtils()->getFileData(fullpath, "rb", &nSize);
    
    return initWithImageData(pBuffer, nSize, imageType);
}

bool CCImage::initWithImageData(void * pData, 
                                int nDataLen, 
                                EImageFormat eFmt/* = eSrcFmtPng*/, 
                                int nWidth/* = 0*/,
                                int nHeight/* = 0*/,
                                int nBitsPerComponent/* = 8*/)
{
    bool bRet = false;
    do 
    {
        CC_BREAK_IF(! pData || nDataLen <= 0);

        if (kFmtPng == eFmt)
        {
            bRet = _initWithPngData(pData, nDataLen);
            break;
        }
        else if (kFmtJpg == eFmt)
        {
            bRet = _initWithJpgData(pData, nDataLen);
            break;
        }
        else if (kFmtTiff == eFmt)
        {
            bRet = _initWithTiffData(pData, nDataLen);
            break;
        }
        else if (kFmtRawData == eFmt)
        {
            bRet = _initWithRawData(pData, nDataLen, nWidth, nHeight, nBitsPerComponent);
            break;
        }
        else
        {
            // if it is a png file buffer.
            if (nDataLen > 8)
            {
                unsigned char* pHead = (unsigned char*)pData;
                if (   pHead[0] == 0x89
                    && pHead[1] == 0x50
                    && pHead[2] == 0x4E
                    && pHead[3] == 0x47
                    && pHead[4] == 0x0D
                    && pHead[5] == 0x0A
                    && pHead[6] == 0x1A
                    && pHead[7] == 0x0A)
                {
                    bRet = _initWithPngData(pData, nDataLen);
                    break;
                }
            }

            // if it is a tiff file buffer.
            if (nDataLen > 2)
            {
                unsigned char* pHead = (unsigned char*)pData;
                if (  (pHead[0] == 0x49 && pHead[1] == 0x49)
                    || (pHead[0] == 0x4d && pHead[1] == 0x4d)
                    )
                {
                    bRet = _initWithTiffData(pData, nDataLen);
                    break;
                }
            }

            // if it is a jpeg file buffer.
            if (nDataLen > 2)
            {
                unsigned char* pHead = (unsigned char*)pData;
                if (   pHead[0] == 0xff
                    && pHead[1] == 0xd8)
                {
                    bRet = _initWithJpgData(pData, nDataLen);
                    break;
                }
            }
        }
    } while (0);
    return bRet;
}

bool CCImage::_initWithJpgData(void * data, int nSize)
{
    /* these are standard libjpeg structures for reading(decompression) */
    struct jpeg_decompress_struct cinfo;
    struct jpeg_error_mgr jerr;
    /* libjpeg data structure for storing one row, that is, scanline of an image */
    JSAMPROW row_pointer[1] = {0};
    unsigned long location = 0;
    unsigned int i = 0;

    bool bRet = false;
    do 
    {
        /* here we set up the standard libjpeg error handler */
        cinfo.err = jpeg_std_error( &jerr );

        /* setup decompression process and source, then read JPEG header */
        jpeg_create_decompress( &cinfo );

        jpeg_mem_src( &cinfo, (unsigned char *) data, nSize );

        /* reading the image header which contains image information */
        jpeg_read_header( &cinfo, true );

        // we only support RGB or grayscale
        if (cinfo.jpeg_color_space != JCS_RGB)
        {
            if (cinfo.jpeg_color_space == JCS_GRAYSCALE || cinfo.jpeg_color_space == JCS_YCbCr)
            {
                cinfo.out_color_space = JCS_RGB;
            }
        }
        else
        {
            break;
        }

        /* Start decompression jpeg here */
        jpeg_start_decompress( &cinfo );

        /* init image info */
        m_nWidth  = (short)(cinfo.image_width);
        m_nHeight = (short)(cinfo.image_height);
        m_bHasAlpha = false;
        m_bPreMulti = false;
        m_nBitsPerComponent = 8;
        row_pointer[0] = new unsigned char[cinfo.output_width*cinfo.output_components];
        CC_BREAK_IF(! row_pointer[0]);

        m_pData = new unsigned char[cinfo.output_width*cinfo.output_height*cinfo.output_components];
        CC_BREAK_IF(! m_pData);

        /* now actually read the jpeg into the raw buffer */
        /* read one scan line at a time */
        while( cinfo.output_scanline < cinfo.image_height )
        {
            jpeg_read_scanlines( &cinfo, row_pointer, 1 );
            for( i=0; i<cinfo.image_width*cinfo.output_components;i++) 
            {
                m_pData[location++] = row_pointer[0][i];
            }
        }

        jpeg_finish_decompress( &cinfo );
        jpeg_destroy_decompress( &cinfo );
        /* wrap up decompression, destroy objects, free pointers and close open files */        
        bRet = true;
    } while (0);

    CC_SAFE_DELETE_ARRAY(row_pointer[0]);
    return bRet;
}

bool CCImage::_initWithPngData(void * pData, int nDatalen)
{
// length of bytes to check if it is a valid png file
#define PNGSIGSIZE  8
    bool bRet = false;
    png_byte        header[PNGSIGSIZE]   = {0}; 
    png_structp     png_ptr     =   0;
    png_infop       info_ptr    = 0;

    do 
    {
        // png header len is 8 bytes
        CC_BREAK_IF(nDatalen < PNGSIGSIZE);

        // check the data is png or not
        memcpy(header, pData, PNGSIGSIZE);
        CC_BREAK_IF(png_sig_cmp(header, 0, PNGSIGSIZE));

        // init png_struct
        png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
        CC_BREAK_IF(! png_ptr);

        // init png_info
        info_ptr = png_create_info_struct(png_ptr);
        CC_BREAK_IF(!info_ptr);

#if (CC_TARGET_PLATFORM != CC_PLATFORM_BADA)
        CC_BREAK_IF(setjmp(png_jmpbuf(png_ptr)));
#endif

        // set the read call back function
        tImageSource imageSource;
        imageSource.data    = (unsigned char*)pData;
        imageSource.size    = nDatalen;
        imageSource.offset  = 0;
        png_set_read_fn(png_ptr, &imageSource, pngReadCallback);

        // read png header info
        
        // read png file info
        png_read_info(png_ptr, info_ptr);
        
        m_nWidth = png_get_image_width(png_ptr, info_ptr);
        m_nHeight = png_get_image_height(png_ptr, info_ptr);
        m_nBitsPerComponent = png_get_bit_depth(png_ptr, info_ptr);
        png_uint_32 channels = png_get_channels(png_ptr, info_ptr);
        png_uint_32 color_type = png_get_color_type(png_ptr, info_ptr);

        CCLOG("color type %u", color_type);
        // only support color type: PNG_COLOR_TYPE_RGB, PNG_COLOR_TYPE_RGB_ALPHA PNG_COLOR_TYPE_PALETTE
        // and expand bit depth to 8
        switch (color_type) {
            case PNG_COLOR_TYPE_RGB:
            case PNG_COLOR_TYPE_RGB_ALPHA:
                // do nothing
                
                break;
            case PNG_COLOR_TYPE_PALETTE:
                png_set_palette_to_rgb(png_ptr);
                channels = 3;
                
                break;
            case PNG_COLOR_TYPE_GRAY:
            case PNG_COLOR_TYPE_GRAY_ALPHA:
                if (m_nBitsPerComponent < 8)
                {
                    png_set_expand_gray_1_2_4_to_8(png_ptr);
                }
                png_set_gray_to_rgb(png_ptr);
                channels = 3;
                
                break;
                
            default:
                CCLog("unsopprted color type %u", color_type);
                goto out;
        }
        if (m_nBitsPerComponent == 16)
        {
            png_set_strip_16(png_ptr);
            m_nBitsPerComponent = 8;
        } 
        
        m_bHasAlpha = (color_type & PNG_COLOR_MASK_ALPHA) ? true : false;
        if (m_bHasAlpha)
        {
            channels = 4;
        }

        // read png data
        // m_nBitsPerComponent will always be 8
        m_pData = new unsigned char[m_nWidth * m_nHeight * channels];
        png_bytep* row_pointers = (png_bytep*)malloc(sizeof(png_bytep)*m_nHeight);
        if (row_pointers)
        {
            const unsigned int stride = m_nWidth * channels;
            for (unsigned short i = 0; i < m_nHeight; ++i)
            {
                png_uint_32 q = i * stride;
                row_pointers[i] = (png_bytep)m_pData + q;
            }
            png_read_image(png_ptr, row_pointers);
            
            if (m_bHasAlpha)
            {
                unsigned int *tmp = (unsigned int *)m_pData;
                for(unsigned short i = 0; i < m_nHeight; i++)
                {
                    for(unsigned int j = 0; j < m_nWidth * channels; j += 4)
                    {
                        *tmp++ = CC_RGB_PREMULTIPLY_APLHA( row_pointers[i][j], row_pointers[i][j + 1], 
                                                          row_pointers[i][j + 2], row_pointers[i][j + 3] );
                    }
                }
                
                m_bPreMulti = true;
            }

            free(row_pointers);
            bRet = true;
        }
    } while (0);

out:
    if (png_ptr)
    {
        png_destroy_read_struct(&png_ptr, (info_ptr) ? &info_ptr : 0, 0);
    }
    return bRet;
}

static tmsize_t _tiffReadProc(thandle_t fd, void* buf, tmsize_t size)
{
    tImageSource* isource = (tImageSource*)fd;
    uint8* ma;
    uint64 mb;
    unsigned long n;
    unsigned long o;
    tmsize_t p;
    ma=(uint8*)buf;
    mb=size;
    p=0;
    while (mb>0)
    {
        n=0x80000000UL;
        if ((uint64)n>mb)
            n=(unsigned long)mb;


        if((int)(isource->offset + n) <= isource->size)
        {
            memcpy(ma, isource->data+isource->offset, n);
            isource->offset += n;
            o = n;
        }
        else
        {
            return 0;
        }

        ma+=o;
        mb-=o;
        p+=o;
        if (o!=n)
        {
            break;
        }
    }
    return p;
}

static tmsize_t _tiffWriteProc(thandle_t fd, void* buf, tmsize_t size)
{
    CC_UNUSED_PARAM(fd);
    CC_UNUSED_PARAM(buf);
    CC_UNUSED_PARAM(size);
    return 0;
}


static uint64 _tiffSeekProc(thandle_t fd, uint64 off, int whence)
{
    tImageSource* isource = (tImageSource*)fd;
    uint64 ret = -1;
    do 
    {
        if (whence == SEEK_SET)
        {
            CC_BREAK_IF(off > isource->size-1);
            ret = isource->offset = (uint32)off;
        }
        else if (whence == SEEK_CUR)
        {
            CC_BREAK_IF(isource->offset + off > isource->size-1);
            ret = isource->offset += (uint32)off;
        }
        else if (whence == SEEK_END)
        {
            CC_BREAK_IF(off > isource->size-1);
            ret = isource->offset = (uint32)(isource->size-1 - off);
        }
        else
        {
            CC_BREAK_IF(off > isource->size-1);
            ret = isource->offset = (uint32)off;
        }
    } while (0);

    return ret;
}

static uint64 _tiffSizeProc(thandle_t fd)
{
    tImageSource* pImageSrc = (tImageSource*)fd;
    return pImageSrc->size;
}

static int _tiffCloseProc(thandle_t fd)
{
    CC_UNUSED_PARAM(fd);
    return 0;
}

static int _tiffMapProc(thandle_t fd, void** pbase, toff_t* psize)
{
    CC_UNUSED_PARAM(fd);
    CC_UNUSED_PARAM(pbase);
    CC_UNUSED_PARAM(psize);
    return 0;
}

static void _tiffUnmapProc(thandle_t fd, void* base, toff_t size)
{
    CC_UNUSED_PARAM(fd);
    CC_UNUSED_PARAM(base);
    CC_UNUSED_PARAM(size);
}

bool CCImage::_initWithTiffData(void* pData, int nDataLen)
{
    bool bRet = false;
    do 
    {
        // set the read call back function
        tImageSource imageSource;
        imageSource.data    = (unsigned char*)pData;
        imageSource.size    = nDataLen;
        imageSource.offset  = 0;

        TIFF* tif = TIFFClientOpen("file.tif", "r", (thandle_t)&imageSource, 
            _tiffReadProc, _tiffWriteProc,
            _tiffSeekProc, _tiffCloseProc, _tiffSizeProc,
            _tiffMapProc,
            _tiffUnmapProc);

        CC_BREAK_IF(NULL == tif);

        uint32 w = 0, h = 0;
        uint16 bitsPerSample = 0, samplePerPixel = 0, planarConfig = 0;
        size_t npixels = 0;
        
        TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &w);
        TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &h);
        TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bitsPerSample);
        TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samplePerPixel);
        TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &planarConfig);

        npixels = w * h;
        
        m_bHasAlpha = true;
        m_nWidth = w;
        m_nHeight = h;
        m_nBitsPerComponent = 8;

        m_pData = new unsigned char[npixels * sizeof (uint32)];

        uint32* raster = (uint32*) _TIFFmalloc(npixels * sizeof (uint32));
        if (raster != NULL) 
        {
           if (TIFFReadRGBAImageOriented(tif, w, h, raster, ORIENTATION_TOPLEFT, 0))
           {
                unsigned char* src = (unsigned char*)raster;
                unsigned int* tmp = (unsigned int*)m_pData;

                /* the raster data is pre-multiplied by the alpha component 
                   after invoking TIFFReadRGBAImageOriented
                for(int j = 0; j < m_nWidth * m_nHeight * 4; j += 4)
                {
                    *tmp++ = CC_RGB_PREMULTIPLY_APLHA( src[j], src[j + 1], 
                        src[j + 2], src[j + 3] );
                }
                */
                m_bPreMulti = true;

               memcpy(m_pData, raster, npixels*sizeof (uint32));
           }

          _TIFFfree(raster);
        }
        

        TIFFClose(tif);

        bRet = true;
    } while (0);
    return bRet;
}

bool CCImage::_initWithRawData(void * pData, int nDatalen, int nWidth, int nHeight, int nBitsPerComponent)
{
    bool bRet = false;
    do 
    {
        CC_BREAK_IF(0 == nWidth || 0 == nHeight);

        m_nBitsPerComponent = nBitsPerComponent;
        m_nHeight   = (short)nHeight;
        m_nWidth    = (short)nWidth;
        m_bHasAlpha = true;

        // only RGBA8888 surported
        int nBytesPerComponent = 4;
        int nSize = nHeight * nWidth * nBytesPerComponent;
        m_pData = new unsigned char[nSize];
        CC_BREAK_IF(! m_pData);
        memcpy(m_pData, pData, nSize);

        bRet = true;
    } while (0);
    return bRet;
}

bool CCImage::saveToFile(const char *pszFilePath, bool bIsToRGB)
{
    bool bRet = false;

    do 
    {
        CC_BREAK_IF(NULL == pszFilePath);

        std::string strFilePath(pszFilePath);
        CC_BREAK_IF(strFilePath.size() <= 4);

        std::string strLowerCasePath(strFilePath);
        for (unsigned int i = 0; i < strLowerCasePath.length(); ++i)
        {
            strLowerCasePath[i] = tolower(strFilePath[i]);
        }

        if (std::string::npos != strLowerCasePath.find(".png"))
        {
            CC_BREAK_IF(!_saveImageToPNG(pszFilePath, bIsToRGB));
        }
        else if (std::string::npos != strLowerCasePath.find(".jpg"))
        {
            CC_BREAK_IF(!_saveImageToJPG(pszFilePath));
        }
        else
        {
            break;
        }

        bRet = true;
    } while (0);

    return bRet;
}

bool CCImage::_saveImageToPNG(const char * pszFilePath, bool bIsToRGB)
{
    bool bRet = false;
    do 
    {
        CC_BREAK_IF(NULL == pszFilePath);

        FILE *fp;
        png_structp png_ptr;
        png_infop info_ptr;
        png_colorp palette;
        png_bytep *row_pointers;

        fp = fopen(pszFilePath, "wb");
        CC_BREAK_IF(NULL == fp);

        png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

        if (NULL == png_ptr)
        {
            fclose(fp);
            break;
        }

        info_ptr = png_create_info_struct(png_ptr);
        if (NULL == info_ptr)
        {
            fclose(fp);
            png_destroy_write_struct(&png_ptr, NULL);
            break;
        }
#if (CC_TARGET_PLATFORM != CC_PLATFORM_BADA)
        if (setjmp(png_jmpbuf(png_ptr)))
        {
            fclose(fp);
            png_destroy_write_struct(&png_ptr, &info_ptr);
            break;
        }
#endif
        png_init_io(png_ptr, fp);

        if (!bIsToRGB && m_bHasAlpha)
        {
            png_set_IHDR(png_ptr, info_ptr, m_nWidth, m_nHeight, 8, PNG_COLOR_TYPE_RGB_ALPHA,
                PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
        } 
        else
        {
            png_set_IHDR(png_ptr, info_ptr, m_nWidth, m_nHeight, 8, PNG_COLOR_TYPE_RGB,
                PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
        }

        palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH * sizeof (png_color));
        png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);

        png_write_info(png_ptr, info_ptr);

        png_set_packing(png_ptr);

        row_pointers = (png_bytep *)malloc(m_nHeight * sizeof(png_bytep));
        if(row_pointers == NULL)
        {
            fclose(fp);
            png_destroy_write_struct(&png_ptr, &info_ptr);
            break;
        }

        if (!m_bHasAlpha)
        {
            for (int i = 0; i < (int)m_nHeight; i++)
            {
                row_pointers[i] = (png_bytep)m_pData + i * m_nWidth * 3;
            }

            png_write_image(png_ptr, row_pointers);

            free(row_pointers);
            row_pointers = NULL;
        }
        else
        {
            if (bIsToRGB)
            {
                unsigned char *pTempData = new unsigned char[m_nWidth * m_nHeight * 3];
                if (NULL == pTempData)
                {
                    fclose(fp);
                    png_destroy_write_struct(&png_ptr, &info_ptr);
                    break;
                }

                for (int i = 0; i < m_nHeight; ++i)
                {
                    for (int j = 0; j < m_nWidth; ++j)
                    {
                        pTempData[(i * m_nWidth + j) * 3] = m_pData[(i * m_nWidth + j) * 4];
                        pTempData[(i * m_nWidth + j) * 3 + 1] = m_pData[(i * m_nWidth + j) * 4 + 1];
                        pTempData[(i * m_nWidth + j) * 3 + 2] = m_pData[(i * m_nWidth + j) * 4 + 2];
                    }
                }

                for (int i = 0; i < (int)m_nHeight; i++)
                {
                    row_pointers[i] = (png_bytep)pTempData + i * m_nWidth * 3;
                }

                png_write_image(png_ptr, row_pointers);

                free(row_pointers);
                row_pointers = NULL;

                CC_SAFE_DELETE_ARRAY(pTempData);
            } 
            else
            {
                for (int i = 0; i < (int)m_nHeight; i++)
                {
                    row_pointers[i] = (png_bytep)m_pData + i * m_nWidth * 4;
                }

                png_write_image(png_ptr, row_pointers);

                free(row_pointers);
                row_pointers = NULL;
            }
        }

        png_write_end(png_ptr, info_ptr);

        png_free(png_ptr, palette);
        palette = NULL;

        png_destroy_write_struct(&png_ptr, &info_ptr);

        fclose(fp);

        bRet = true;
    } while (0);
    return bRet;
}
bool CCImage::_saveImageToJPG(const char * pszFilePath)
{
    bool bRet = false;
    do 
    {
        CC_BREAK_IF(NULL == pszFilePath);

        struct jpeg_compress_struct cinfo;
        struct jpeg_error_mgr jerr;
        FILE * outfile;                 /* target file */
        JSAMPROW row_pointer[1];        /* pointer to JSAMPLE row[s] */
        int     row_stride;          /* physical row width in image buffer */

        cinfo.err = jpeg_std_error(&jerr);
        /* Now we can initialize the JPEG compression object. */
        jpeg_create_compress(&cinfo);

        CC_BREAK_IF((outfile = fopen(pszFilePath, "wb")) == NULL);
        
        jpeg_stdio_dest(&cinfo, outfile);

        cinfo.image_width = m_nWidth;    /* image width and height, in pixels */
        cinfo.image_height = m_nHeight;
        cinfo.input_components = 3;       /* # of color components per pixel */
        cinfo.in_color_space = JCS_RGB;       /* colorspace of input image */

        jpeg_set_defaults(&cinfo);

        jpeg_start_compress(&cinfo, TRUE);

        row_stride = m_nWidth * 3; /* JSAMPLEs per row in image_buffer */

        if (m_bHasAlpha)
        {
            unsigned char *pTempData = new unsigned char[m_nWidth * m_nHeight * 3];
            if (NULL == pTempData)
            {
                jpeg_finish_compress(&cinfo);
                jpeg_destroy_compress(&cinfo);
                fclose(outfile);
                break;
            }

            for (int i = 0; i < m_nHeight; ++i)
            {
                for (int j = 0; j < m_nWidth; ++j)

                {
                    pTempData[(i * m_nWidth + j) * 3] = m_pData[(i * m_nWidth + j) * 4];
                    pTempData[(i * m_nWidth + j) * 3 + 1] = m_pData[(i * m_nWidth + j) * 4 + 1];
                    pTempData[(i * m_nWidth + j) * 3 + 2] = m_pData[(i * m_nWidth + j) * 4 + 2];
                }
            }

            while (cinfo.next_scanline < cinfo.image_height) {
                row_pointer[0] = & pTempData[cinfo.next_scanline * row_stride];
                (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
            }

            CC_SAFE_DELETE_ARRAY(pTempData);
        } 
        else
        {
            while (cinfo.next_scanline < cinfo.image_height) {
                row_pointer[0] = & m_pData[cinfo.next_scanline * row_stride];
                (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
            }
        }

        jpeg_finish_compress(&cinfo);
        fclose(outfile);
        jpeg_destroy_compress(&cinfo);
        
        bRet = true;
    } while (0);
    return bRet;
}

NS_CC_END

#endif // (CC_TARGET_PLATFORM != TARGET_OS_IPHONE)
/* ios/CCImage_ios.mm uses "mm" as the extension, 
   so we cannot inclue it in this CCImage.cpp.
   It makes a little difference on ios */