axmol/platform_support/src/ccxImage.cpp

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

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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THE SOFTWARE.
****************************************************************************/

#include "ccxImage.h"

#include "ccxStdC.h"
#include "png.h"
#include "jpeglib.h"

#define CCX_RGB_PREMULTIPLY_APLHA(vr, vg, vb, va) \
    (unsigned)(((unsigned)((ccxByte)(vr) * ((ccxByte)(va) + 1)) >> 8) | \
    ((unsigned)((ccxByte)(vg) * ((ccxByte)(va) + 1) >> 8) << 8) | \
    ((unsigned)((ccxByte)(vb) * ((ccxByte)(va) + 1) >> 8) << 16) | \
    ((unsigned)(ccxByte)(va) << 24))

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");
    }
}

NS_CC_BEGIN;

//////////////////////////////////////////////////////////////////////////
// Impliment ccxImage
//////////////////////////////////////////////////////////////////////////

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

}

bool ccxImage::initWithImageFile(const char * strPath, EImageFormat eImgFmt/* = eFmtPng*/)
{
    bool bRet = false;
    FILE *fp = nil;
    unsigned char *buffer = NULL;
    do 
    {
        if (kFmtJpg == eImgFmt)
        {
            bRet = _initWithJpgFile(strPath);
            break;
        }
        CCX_BREAK_IF(kFmtPng != eImgFmt);

        // open file
        fp = fopen(strPath, "rb");
        CCX_BREAK_IF(! fp);

        // compute the length of file
        fseek(fp,0,SEEK_END);
        int size = ftell(fp);
        fseek(fp,0,SEEK_SET);

        // allocate enough memory to save the data of file
        buffer = new unsigned char[size];
        CCX_BREAK_IF(! buffer);

        // read data
        size = fread(buffer, sizeof(unsigned char), size, fp);

        bRet = _initWithPngData(buffer, size);

    	bRet = true;
    } while (0);

    CCX_SAFE_DELETE_ARRAY(buffer);
    if (fp)
    {
        fclose(fp);
    }
    return bRet;
}

bool ccxImage::initWithImageData(void * pData, int nDataLen, EImageFormat eFmt/* = eSrcFmtPng*/)
{
    bool bRet = false;
    do 
    {
    	CCX_BREAK_IF(! pData || nDataLen <= 0);

        if (kFmtPng == eFmt)
        {
            bRet = _initWithPngData(pData, nDataLen);
            break;
        }
        else if (kFmtJpg == eFmt)
        {
//             bRet = _initWithJpgData(pData, nDataLen);
            break;
        }
    } while (0);
    return bRet;
}

bool ccxImage::_initWithJpgFile(const char * strFileName)
{
    /* 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];

    FILE *infile = fopen( strFileName, "rb" );
    unsigned long location = 0;
    unsigned int i = 0;

    if ( !infile )
    {
        return false;
    }

    /* 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 );

    /* this makes the library read from infile */
    jpeg_stdio_src( &cinfo, infile );

    /* 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
    {
        return false;
    }

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

    /* init image info */
    m_nWidth    = (ccxInt16)cinfo.image_width;
    m_nHeight   = (ccxInt16)cinfo.image_height;
    m_bHasAlpha = false;
    m_bPreMulti = false;
    m_nBitsPerComponent = 8;
    m_pData.reset(new ccxByte[cinfo.output_width*cinfo.output_height*cinfo.output_components]);
    ccxByte * pData = m_pData.get();

    /* now actually read the jpeg into the raw buffer */
    row_pointer[0] = new unsigned char[cinfo.output_width*cinfo.output_components];

    /* 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.num_components;i++) 
            pData[location++] = row_pointer[0][i];
    }

    /* wrap up decompression, destroy objects, free pointers and close open files */
    jpeg_finish_decompress( &cinfo );
    jpeg_destroy_decompress( &cinfo );
    delete row_pointer[0];
    fclose( infile );

    return true;
}

bool ccxImage::_initWithPngData(void * pData, int nDatalen)
{
    bool bRet = false;
    png_byte        header[8]   = {0}; 
    png_structp     png_ptr =   nil;
    png_infop       info_ptr    = nil;

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

        // check the data is png or not
        memcpy(header, pData, 8);
        CCX_BREAK_IF(png_sig_cmp(header, 0, 8));

        // init png_struct
        png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, nil, nil, nil);
        CCX_BREAK_IF(! png_ptr);

        // init png_info
        info_ptr = png_create_info_struct(png_ptr);
        CCX_BREAK_IF(! info_ptr || setjmp(png_jmpbuf(png_ptr)));

        bRet = true;

        // 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
        // PNG_TRANSFORM_EXPAND: perform set_expand()
        // PNG_TRANSFORM_PACKING: expand 1, 2 and 4-bit samples to bytes
        // PNG_TRANSFORM_STRIP_16: strip 16-bit samples to 8 bits
        // PNG_TRANSFORM_GRAY_TO_RGB: expand grayscale samples to RGB (or GA to RGBA)
        png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_EXPAND | PNG_TRANSFORM_PACKING 
            | PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_GRAY_TO_RGB, nil);

        int         color_type  = 0;
        png_uint_32 nWidth = 0;
        png_uint_32 nHeight = 0;
        int         nBitsPerComponent = 0;
        png_get_IHDR(png_ptr, info_ptr, &nWidth, &nHeight, &nBitsPerComponent, &color_type, nil, nil, nil);

        // init image info
        m_bPreMulti = true;
        m_bHasAlpha = ( info_ptr->color_type & PNG_COLOR_MASK_ALPHA ) ? true : false;

        // allocate memory and read data
        int bytesPerComponent = 3;
        if (m_bHasAlpha)
        {
            bytesPerComponent = 4;
        }
        m_pData.reset(new ccxByte[nHeight * nWidth * bytesPerComponent]);
        png_bytep * rowPointers = png_get_rows(png_ptr, info_ptr);

        // copy data to image info
        int bytesPerRow = nWidth * bytesPerComponent;
        if(m_bHasAlpha)
        {
            unsigned int *tmp = (unsigned int *)m_pData.get();
            for(unsigned int i = 0; i < nHeight; i++)
            {
                for(int j = 0; j < bytesPerRow; j += 4)
                {
                    *tmp++ = CCX_RGB_PREMULTIPLY_APLHA( rowPointers[i][j], rowPointers[i][j + 1], 
                        rowPointers[i][j + 2], rowPointers[i][j + 3] );
                }
            }
        }
        else
        {
            for (unsigned int j = 0; j < nHeight; ++j)
            {
                memcpy(m_pData.get() + j * bytesPerRow, rowPointers[j], bytesPerRow);
            }
        }

        m_nHeight   = (ccxInt16)nHeight;
        m_nWidth    = (ccxInt16)nWidth;
        m_nBitsPerComponent      = nBitsPerComponent;
        bRet        = true;
    } while (0);

    if (!png_ptr)
    {
        png_destroy_read_struct(&png_ptr, (info_ptr) ? &info_ptr : nil, nil);
    }
    return bRet;
}

NS_CC_END;

#if (CCX_TARGET_PLATFORM == CCX_PLATFORM_WIN32)
#include "win32/ccxImage_win32.cpp"
#endif