static void pngReaderCallback(png_structp png_ptr, png_bytep data, png_size_t length){    ImageSource* isource = (ImageSource*)png_get_io_ptr(png_ptr);    if(isource->offset + length <= isource->size)    {       memcpy(data, (unsigned char *)isource->data + isource->offset, length);       isource->offset += length;    }    else    {        png_error(png_ptr,"pngReaderCallback failed");    }}static HBITMAP LoadPNGFromMemory(void * lpData, UINT size, HDC hdc, BYTE **m_ppBits, int &width, int &height){    HBITMAP hBitBmp=NULL;    if (lpData==NULL || size==0) return NULL;    png_structp png_ptr;    png_infop   info_ptr;    /* initialize stuff */    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);        if (!png_ptr) return NULL;    info_ptr = png_create_info_struct(png_ptr);    if (!info_ptr)  return NULL;    if (setjmp(png_jmpbuf(png_ptr)))    {        png_destroy_read_struct(&png_ptr, &info_ptr, 0);        return false;    }    ImageSource imgsource;    imgsource.data = lpData;    imgsource.size = size;    imgsource.offset = 0;    png_set_read_fn(png_ptr, &imgsource, pngReaderCallback);    png_read_info(png_ptr, info_ptr);    unsigned long x,y,i;    BYTE r,g,b,a;    png_bytep * row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * info_ptr->height);    if (row_pointers)    {        for (y=0; y
     
      height; y++)            row_pointers[y] = (png_byte*) malloc(info_ptr->rowbytes);        png_read_image(png_ptr, row_pointers);        BITMAPINFOHEADER m_bmpHeader;        memset(&m_bmpHeader,NULL,sizeof(m_bmpHeader));        m_bmpHeader.biSize = sizeof(m_bmpHeader);        m_bmpHeader.biBitCount = 32;;        m_bmpHeader.biCompression = BI_RGB;        m_bmpHeader.biWidth = info_ptr->width;        m_bmpHeader.biHeight = info_ptr->height;        m_bmpHeader.biPlanes = 1;        BYTE *pBits;        hBitBmp = CreateDIBSection(hdc, (BITMAPINFO *)&m_bmpHeader, DIB_RGB_COLORS, (void **)&pBits, NULL, 0);        if (hBitBmp && (pBits))        {            width=info_ptr->width;            height=info_ptr->height;            for (y=0; y
      
       height; y++)            {                memcpy(pBits+(info_ptr->height-y-1)*info_ptr->rowbytes, row_pointers[y], info_ptr->rowbytes);            }            *m_ppBits=pBits;            for (y=0; y
       
        height; y++)            {                for (x=0; x
        
         width; x++)                {                    i=(info_ptr->height-1-y)*info_ptr->width*4+x*4;                    r=pBits[i+0];                    g=pBits[i+1];                    b=pBits[i+2];                    a=pBits[i+3];                    // RGBA -> BGRA and to AlphaBend() Colors                    pBits[i+0]=BYTE(b * a / 255);                    pBits[i+1]=BYTE(g * a / 255);                    pBits[i+2]=BYTE(r * a / 255);                }            }        }        for (y=0; y
         
          height; y++)        {            free(row_pointers[y]);        }        free(row_pointers);    }    // free memory    png_destroy_read_struct(&png_ptr, &info_ptr, 0);    return hBitBmp;}