/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.

 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
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/
 
#include "CCTextureUtils.h"


NS_CC_BEGIN

namespace backend { namespace PixelFormatUtils {
    
    //////////////////////////////////////////////////////////////////////////
    //convertor function
    
    // IIIIIIII -> RRRRRRRRGGGGGGGGGBBBBBBBB
    void convertI8ToRGB888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (size_t i = 0; i < dataLen; ++i)
        {
            *outData++ = data[i];     //R
            *outData++ = data[i];     //G
            *outData++ = data[i];     //B
        }
    }
    
    // IIIIIIIIAAAAAAAA -> RRRRRRRRGGGGGGGGBBBBBBBB
    void convertAI88ToRGB888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *outData++ = data[i];     //R
            *outData++ = data[i];     //G
            *outData++ = data[i];     //B
        }
    }
    
    // IIIIIIII -> RRRRRRRRGGGGGGGGGBBBBBBBBAAAAAAAA
    void convertI8ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (size_t i = 0; i < dataLen; ++i)
        {
            *outData++ = data[i];     //R
            *outData++ = data[i];     //G
            *outData++ = data[i];     //B
            *outData++ = 0xFF;        //A
        }
    }
    
    // IIIIIIIIAAAAAAAA -> RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA
    void convertAI88ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *outData++ = data[i];     //R
            *outData++ = data[i];     //G
            *outData++ = data[i];     //B
            *outData++ = data[i + 1]; //A
        }
    }
    
    // IIIIIIII -> RRRRRGGGGGGBBBBB
    void convertI8ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i] & 0x00FC) << 3         //G
            | (data[i] & 0x00F8) >> 3;        //B
        }
    }
    
    // IIIIIIIIAAAAAAAA -> RRRRRGGGGGGBBBBB
    void convertAI88ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i] & 0x00FC) << 3         //G
            | (data[i] & 0x00F8) >> 3;        //B
        }
    }
    
    // IIIIIIII -> RRRRGGGGBBBBAAAA
    void convertI8ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = (data[i] & 0x00F0) << 8    //R
            | (data[i] & 0x00F0) << 4             //G
            | (data[i] & 0x00F0)                  //B
            | 0x000F;                             //A
        }
    }
    
    // IIIIIIIIAAAAAAAA -> RRRRGGGGBBBBAAAA
    void convertAI88ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *out16++ = (data[i] & 0x00F0) << 8    //R
            | (data[i] & 0x00F0) << 4             //G
            | (data[i] & 0x00F0)                  //B
            | (data[i + 1] & 0x00F0) >> 4;          //A
        }
    }
    
    // IIIIIIIIAAAAAAAA -> BBBBBGGG GGGRRRR
    void convertAI88ToBGR565(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t* out16 = (uint16_t*)outData;
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i] & 0x00FC) << 3             //G
            | (data[i] & 0x00F8) >> 3;            //B
        }
    }
    
    // IIIIIIIIAAAAAAAA -> BBBBBGGG GGRRRRRA
    void convertAI88ToBGR5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t* out16 = (uint16_t*)outData;
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *out16++ = (data[i] & 0x00F8) << 7    //R
            | (data[i] & 0x00F8) << 2             //G
            | (data[i] & 0x00F8) >> 3             //B
            | (data[i + 1] & 0x0080) << 8;          //A
        }
    }
    
    // IIIIIIIIAAAAAAAA -> AAAABBBB GGGGRRRR
    void convertAI88ToABGR4(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t* out16 = (uint16_t*)outData;
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *out16++ = (data[i] & 0x00F0) << 8    //R
            | (data[i] & 0x00F0) << 4             //G
            | (data[i] & 0x00F0)                  //B
            | (data[i + 1] & 0x00F0) >> 4;        //A
        }
    }
    
    
    // IIIIIIII -> RRRRRGGGGGBBBBBA
    void convertI8ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i] & 0x00F8) << 3         //G
            | (data[i] & 0x00F8) >> 2         //B
            | 0x0001;                         //A
        }
    }
    
    /// IIIIIIII -> BBBBBGGG GGRRRRRA
    void convertI8ToBGR5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t *out16 = (uint16_t*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = (data[i] & 0xF8) << 7    //R
            | (data[i] & 0xF8) << 2             //G
            | (data[i] & 0xF8) >> 3             //B
            | 0x8000;                           //A
        }
    }
    
    // IIIIIIIII -> BBBBBGGG GGGRRRRR
    void convertI8ToBGR565(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t *out16 = (uint16_t*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = (data[i] & 0xF8) << 8    //R
            | (data[i] & 0xFC) << 3             //G
            | (data[i] & 0xF8) >> 3             //B
            ;
        }
    }
    
    // IIIIIIIII -> AAAABBBBB GGGGRRRR
    void convertI8ToABGR4(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t *out16 = (uint16_t*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = (data[i] & 0xF0) << 8    //R
            | (data[i] & 0xF0) << 4             //G
            | (data[i] & 0xF0)                  //B
            | 0x000F;
        }
    }
    
    // IIIIIIIIAAAAAAAA -> RRRRRGGGGGBBBBBA
    void convertAI88ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i] & 0x00F8) << 3         //G
            | (data[i] & 0x00F8) >> 2         //B
            | (data[i + 1] & 0x0080) >> 7;    //A
        }
    }
    
    // IIIIIIII -> IIIIIIIIAAAAAAAA
    void convertI8ToAI88(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (size_t i = 0; i < dataLen; ++i)
        {
            *out16++ = 0xFF00     //A
            | data[i];            //I
        }
    }
    
    // IIIIIIIIAAAAAAAA -> AAAAAAAA
    void convertAI88ToA8(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (size_t i = 1; i < dataLen; i += 2)
        {
            *outData++ = data[i]; //A
        }
    }
    
    // IIIIIIIIAAAAAAAA -> IIIIIIII
    void convertAI88ToI8(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
        {
            *outData++ = data[i]; //R
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA
    void convertRGB888ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *outData++ = data[i];         //R
            *outData++ = data[i + 1];     //G
            *outData++ = data[i + 2];     //B
            *outData++ = 0xFF;            //A
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> RRRRRRRRGGGGGGGGBBBBBBBB
    void convertRGBA8888ToRGB888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 3; i < l; i += 4)
        {
            *outData++ = data[i];         //R
            *outData++ = data[i + 1];     //G
            *outData++ = data[i + 2];     //B
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> RRRRRGGGGGGBBBBB
    void convertRGB888ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i + 1] & 0x00FC) << 3     //G
            | (data[i + 2] & 0x00F8) >> 3;    //B
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> RRRRRGGGGGGBBBBB
    void convertRGBA8888ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 3; i < l; i += 4)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i + 1] & 0x00FC) << 3     //G
            | (data[i + 2] & 0x00F8) >> 3;    //B
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> AAAAAAAA
    void convertRGB888ToA8(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *outData++ = (data[i] * 299 + data[i + 1] * 587 + data[i + 2] * 114 + 500) / 1000;  //A =  (R*299 + G*587 + B*114 + 500) / 1000
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> IIIIIIII
    void convertRGB888ToI8(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *outData++ = (data[i] * 299 + data[i + 1] * 587 + data[i + 2] * 114 + 500) / 1000;  //I =  (R*299 + G*587 + B*114 + 500) / 1000
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> IIIIIIII
    void convertRGBA8888ToI8(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 3; i < l; i += 4)
        {
            *outData++ = (data[i] * 299 + data[i + 1] * 587 + data[i + 2] * 114 + 500) / 1000;  //I =  (R*299 + G*587 + B*114 + 500) / 1000
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> AAAAAAAA
    void convertRGBA8888ToA8(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 3; i < l; i += 4)
        {
            *outData++ = data[i + 3]; //A
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> IIIIIIIIAAAAAAAA
    void convertRGB888ToAI88(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *outData++ = (data[i] * 299 + data[i + 1] * 587 + data[i + 2] * 114 + 500) / 1000;  //I =  (R*299 + G*587 + B*114 + 500) / 1000
            *outData++ = 0xFF;
        }
    }
    
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> IIIIIIIIAAAAAAAA
    void convertRGBA8888ToAI88(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (ssize_t i = 0, l = dataLen - 3; i < l; i += 4)
        {
            *outData++ = (data[i] * 299 + data[i + 1] * 587 + data[i + 2] * 114 + 500) / 1000;  //I =  (R*299 + G*587 + B*114 + 500) / 1000
            *outData++ = data[i + 3];
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> RRRRGGGGBBBBAAAA
    void convertRGB888ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *out16++ = ((data[i] & 0x00F0) << 8           //R
                        | (data[i + 1] & 0x00F0) << 4     //G
                        | (data[i + 2] & 0xF0)            //B
                        | 0x0F);                         //A
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> RRRRGGGGBBBBAAAA
    void convertRGBA8888ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 3; i < l; i += 4)
        {
            *out16++ = (data[i] & 0x00F0) << 8    //R
            | (data[i + 1] & 0x00F0) << 4         //G
            | (data[i + 2] & 0xF0)                //B
            | (data[i + 3] & 0xF0) >> 4;         //A
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> RRRRRGGGGGBBBBBA
    void convertRGB888ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 3)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i + 1] & 0x00F8) << 3     //G
            | (data[i + 2] & 0x00F8) >> 2     //B
            | 0x01;                          //A
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> BBBBBGGG GGGRRRRR
    void convertRGB888ToB5G6R5(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        uint16_t *outData = (uint16_t*) out;
        for(size_t i = 0;i < dataLen ; i += 3)
        {
            *outData++ = ((data[i] & 0xF8) << 8)|
            ((data[i + 1] &0xFC) << 3) |
            ((data[i + 2] & 0xF8)>> 3);
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> BBBBBGGG GGRRRRRA
    void convertRGB888ToBGR5A1(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        uint16_t *outData = (uint16_t*) out;
        for(size_t i = 0;i < dataLen ; i += 3)
        {
            *outData++ = ((data[i] & 0xF8) << 7) |
            ((data[i + 1] & 0xF8) << 2) |
            ((data[i + 2] &0xF8) >> 3) | 0x8000;
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBB -> AAAABBBB GGGGRRRR
    void convertRGB888ToABGR4(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        uint16_t *outData = (uint16_t*) out;
        for(size_t i = 0;i < dataLen ; i += 3)
        {
            *outData++ = ((data[i] & 0xF0) << 8) | //r
            ((data[i + 1] & 0xF0) << 4) |          //g
            ((data[i + 2] & 0xF0)) |               //b
            0x000F;                                //a
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> RRRRRGGG GGBBBBBA
    void convertRGBA8888ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        unsigned short* out16 = (unsigned short*)outData;
        for (ssize_t i = 0, l = dataLen - 2; i < l; i += 4)
        {
            *out16++ = (data[i] & 0x00F8) << 8    //R
            | (data[i + 1] & 0x00F8) << 3     //G
            | (data[i + 2] & 0x00F8) >> 2     //B
            | (data[i + 3] & 0x0080) >> 7;   //A
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> BBBBBGGG GGGRRRR
    void convertRGBA8888ToBGR565(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        uint16_t *outData = (uint16_t*)out;
        const size_t pixelCnt = dataLen / 4;
        for(size_t i=0;i < pixelCnt; i++ )
        {
            outData[i] = ((data[i*4 + 2] & 0xF8) >> 3) |     //b
            ((data[i * 4 + 1] & 0xFC ) << 3) |           //g
            (((data[i * 4 + 0] & 0xF8) << 8));             //r
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> AAAABBBB GGGGRRRR
    void convertRGBA8888ToABGR4(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        uint16_t *outData = (uint16_t*)out;
        for(size_t i=0;i < dataLen; i+=4 )
        {
            *outData++ = ((data[i] & 0xF0) << 8) |     //r
            ((data[i + 1] & 0xF0) << 4) |              //g
            ((data[i + 2] & 0xF0)) |                   //b
            ((data[i + 3] & 0xF0) >> 4);               //a
        }
    }
    
    // RRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA -> BBBBBGGG GGRRRRRA
    void convertRGBA8888ToBGR5A1(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        uint16_t *outData = (uint16_t*)out;
        for(size_t i = 0; i < dataLen; i += 4)
        {
            *outData++ = ((data[i + 2] & 0xF8) >> 3)|     //b
            ((data[i + 1] & 0xF8 ) << 2) |                //g
            ((data[i + 0] & 0xF8 ) << 7) |                //r
            ((data[i + 3] & 0x80) << 8);                  //a
        }
    }
    
    
    void convertRGB5A1ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t *inData = (uint16_t*)data;
        const size_t pixelLen = dataLen / 2;
        uint16_t pixel;
        for (size_t i = 0; i < pixelLen; i++)
        {
            pixel = inData[i];
            *outData++ = (pixel & (0x001F << 11)) >> 8;
            *outData++ = (pixel & (0x001F << 6)) >> 3;
            *outData++ = (pixel & (0x001F << 1)) << 2;
            *outData++ = (pixel & 0x0001) * 255;
        }
    }
    
    // ABBBBBGG GGGRRRRR  -> BBBBBGGG GGRRRRRA
    void convertRGB5A1ToBGR5A1(const unsigned char *data, size_t dataLen, unsigned char *out)
    {
        const size_t pixelLen = dataLen / 2;
        const uint16_t *inData = (uint16_t*) data;
        uint16_t *outData = (uint16_t*) out;
        uint16_t pixel;
        for (size_t i = 0; i < pixelLen; i++ )
        {
            pixel = inData[i];
            outData[i] = (pixel >> 1) | ((pixel & 0x0001) << 15);
        }
    }
    
    
    void convertRGB565ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t *inData = (uint16_t*)data;
        const size_t pixelLen = dataLen / 2;
        uint16_t pixel;
        for (size_t i = 0; i < pixelLen; i++)
        {
            pixel = inData[i];
            *outData++ = (pixel & (0x001F << 11)) >> 8;
            *outData++ = (pixel & (0x003F << 5)) >> 3;
            *outData++ = (pixel & (0x001F)) << 3;
            *outData++ = 0xFF;
        }
    }
    
    // BBBBBGGG GGGRRRRR -> BBBGGG GGGRRRRR
    // void convertRGB565ToB5G6R5(const unsigned char *data, ssize_t dataLen, unsigned char *out)
    
    
    void convertRGBA4444ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        uint16_t *inData = (uint16_t*)data;
        const size_t pixelLen = dataLen / 2;
        uint16_t pixel;
        for (size_t i = 0; i < pixelLen; i++)
        {
            pixel = inData[i];
            *outData++ = ((pixel & 0xF000) >> 12) * 17;
            *outData++ = ((pixel & 0x0F00) >> 8) * 17;
            *outData++ = ((pixel & 0x00F0) >> 4) * 17;
            *outData++ = ((pixel & 0x000F) * 17);
        }
        
    }
    
    // AAAABBBBGGGGRRRR -> AAAABBBB GGGGRRRR
    //void convertRGBA4444ToABGR4444(const unsigned char *data, ssize_t dataLen, unsigned char *out)
    
    void convertA8ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        for (size_t i = 0; i < dataLen; i++)
        {
            *outData++ = 0;
            *outData++ = 0;
            *outData++ = 0;
            *outData++ = data[i];
        }
    }
    
    void convertBGRA8888ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData)
    {
        const size_t pixelCounts = dataLen / 4;
        for (size_t i = 0; i < pixelCounts; i++)
        {
            *outData++ = data[i*4 + 2];
            *outData++ = data[i*4 + 1];
            *outData++ = data[i*4 + 0];
            *outData++ = data[i*4 + 3];
        }
    }
    
    // converter function end
    //////////////////////////////////////////////////////////////////////////
    
    
    
    cocos2d::backend::PixelFormat convertI8ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen*4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToRGBA8888(data, dataLen, *outData);
                break;
            case PixelFormat::RGB888:
                *outDataLen = dataLen*3;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToRGB888(data, dataLen, *outData);
                break;
            case PixelFormat::RGB565:
                *outDataLen = dataLen*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToRGB565(data, dataLen, *outData);
                break;
            case PixelFormat::AI88:
                *outDataLen = dataLen*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToAI88(data, dataLen, *outData);
                break;
            case PixelFormat::RGBA4444:
                *outDataLen = dataLen*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToRGBA4444(data, dataLen, *outData);
                break;
            case PixelFormat::RGB5A1:
                *outDataLen = dataLen*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToRGB5A1(data, dataLen, *outData);
                break;
            case PixelFormat::A8:
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                break;
            case PixelFormat::MTL_BGR5A1:
                *outDataLen = dataLen * 2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToBGR5A1(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_ABGR4:
                *outDataLen = dataLen * 2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToABGR4(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_B5G6R5:
                *outDataLen = dataLen * 2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertI8ToBGR565(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::I8)
                {
                    CCLOG("Can not convert image format PixelFormat::I8 to format ID:%d, we will use it's origin format PixelFormat::I8", static_cast<int>(format));
                }
                
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::I8;
        }
        
        return format;
    }
    
    cocos2d::backend::PixelFormat convertAI88ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToRGBA8888(data, dataLen, *outData);
                break;
            case PixelFormat::RGB888:
                *outDataLen = dataLen/2*3;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToRGB888(data, dataLen, *outData);
                break;
            case PixelFormat::RGB565:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToRGB565(data, dataLen, *outData);
                break;
            case PixelFormat::A8:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToA8(data, dataLen, *outData);
                break;
            case PixelFormat::I8:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToI8(data, dataLen, *outData);
                break;
            case PixelFormat::RGBA4444:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToRGBA4444(data, dataLen, *outData);
                break;
            case PixelFormat::RGB5A1:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToRGB5A1(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_ABGR4:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToABGR4(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_B5G6R5:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToBGR565(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_BGR5A1:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertAI88ToBGR5A1(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::AI88)
                {
                    CCLOG("Can not convert image format PixelFormat::AI88 to format ID:%d, we will use it's origin format PixelFormat::AI88", static_cast<int>(format));
                }
                
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::AI88;
                break;
        }
        
        return format;
    }
    
    cocos2d::backend::PixelFormat convertRGB888ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen/3*4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToRGBA8888(data, dataLen, *outData);
                break;
            case PixelFormat::RGB565:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToRGB565(data, dataLen, *outData);
                break;
            case PixelFormat::A8:
                *outDataLen = dataLen/3;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToA8(data, dataLen, *outData);
                break;
            case PixelFormat::I8:
                *outDataLen = dataLen/3;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToI8(data, dataLen, *outData);
                break;
            case PixelFormat::AI88:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToAI88(data, dataLen, *outData);
                break;
            case PixelFormat::RGBA4444:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToRGBA4444(data, dataLen, *outData);
                break;
            case PixelFormat::RGB5A1:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToRGB5A1(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_B5G6R5:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToB5G6R5(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_BGR5A1:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToBGR5A1(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_ABGR4:
                *outDataLen = dataLen/3*2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB888ToABGR4(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::RGB888)
                {
                    CCLOG("Can not convert image format PixelFormat::RGB888 to format ID:%d, we will use it's origin format PixelFormat::RGB888", static_cast<int>(format));
                }
                
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::RGB888;
        }
        return format;
    }
    
    cocos2d::backend::PixelFormat convertRGBA8888ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        
        switch (format)
        {
            case PixelFormat::RGB888:
                *outDataLen = dataLen/4*3;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToRGB888(data, dataLen, *outData);
                break;
            case PixelFormat::RGB565:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToRGB565(data, dataLen, *outData);
                break;
            case PixelFormat::A8:
                *outDataLen = dataLen/4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToA8(data, dataLen, *outData);
                break;
            case PixelFormat::I8:
                *outDataLen = dataLen/4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToI8(data, dataLen, *outData);
                break;
            case PixelFormat::AI88:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToAI88(data, dataLen, *outData);
                break;
            case PixelFormat::RGBA4444:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToRGBA4444(data, dataLen, *outData);
                break;
            case PixelFormat::RGB5A1:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToRGB5A1(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_B5G6R5:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToBGR565(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_ABGR4:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToABGR4(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_BGR5A1:
                *outDataLen = dataLen/2;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA8888ToBGR5A1(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::RGBA8888)
                {
                    CCLOG("Can not convert image format PixelFormat::RGBA8888 to format ID:%d, we will use it's origin format PixelFormat::RGBA8888", static_cast<int>(format));
                }
                
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::RGBA8888;
        }
        
        return format;
    }
    
    cocos2d::backend::PixelFormat convertRGB5A1ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen/2*4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB5A1ToRGBA8888(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_BGR5A1:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB5A1ToBGR5A1(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::RGBA8888)
                {
                    CCLOG("Can not convert image format PixelFormat::RGB5A1 to format ID:%d, we will use it's origin format PixelFormat::RGB51A", static_cast<int>(format));
                }
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::RGBA8888;
        }
        
        return format;
    }
    
    cocos2d::backend::PixelFormat convertRGB565ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen/2*4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGB565ToRGBA8888(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_B5G6R5:
                *outDataLen = dataLen;
                *outData = (unsigned char *)data;
                // they are identical
                //convertRGB565ToB5G6R5(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::RGBA8888)
                {
                    CCLOG("Can not convert image format PixelFormat::RGB565 to format ID:%d, we will use it's origin format PixelFormat::RGB565", static_cast<int>(format));
                }
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::RGBA8888;
        }
        
        return format;
    }
    
    cocos2d::backend::PixelFormat convertA8ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen*4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertA8ToRGBA8888(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::RGBA8888)
                {
                    CCLOG("Can not convert image format PixelFormat::A8 to format ID:%d, we will use it's origin format PixelFormat::A8", static_cast<int>(format));
                }
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::RGBA8888;
        }
        
        return format;
    }
    
    cocos2d::backend::PixelFormat convertRGBA4444ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format)
        {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen/ 2 * 4;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertRGBA4444ToRGBA8888(data, dataLen, *outData);
                break;
            case PixelFormat::MTL_ABGR4:
                *outDataLen = dataLen;
                *outData = (unsigned char *)data;
                //convertRGBA4444ToABGR4444(data, dataLen, *outData);
                break;
            default:
                // unsupported conversion or don't need to convert
                if (format != PixelFormat::AUTO && format != PixelFormat::RGBA8888)
                {
                    CCLOG("Can not convert image format PixelFormat::RGBA444 to format ID:%d, we will use it's origin format PixelFormat::RGBA4444", static_cast<int>(format));
                }
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return PixelFormat::RGBA8888;
        }
        
        return format;
    }
    
    PixelFormat convertBGRA8888ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        switch (format) {
            case PixelFormat::RGBA8888:
                *outDataLen = dataLen;
                *outData = (unsigned char*)malloc(sizeof(unsigned char) * (*outDataLen));
                convertBGRA8888ToRGBA8888(data, dataLen, *outData);
                break;
                
            default:
                break;
        }
        return format;
    }
    
    /*
     convert map:
     1.PixelFormat::RGBA8888
     2.PixelFormat::RGB888
     3.PixelFormat::RGB565
     4.PixelFormat::A8
     5.PixelFormat::I8
     6.PixelFormat::AI88
     7.PixelFormat::RGBA4444
     8.PixelFormat::RGB5A1
     
     gray(5) -> 1235678
     gray alpha(6) -> 12345678
     rgb(2) -> 1235678
     rgba(1) -> 12345678
     
     */
    cocos2d::backend::PixelFormat convertDataToFormat(const unsigned char* data, size_t dataLen, PixelFormat originFormat, PixelFormat format, unsigned char** outData, size_t* outDataLen)
    {
        // don't need to convert
        if (format == originFormat || format == PixelFormat::AUTO)
        {
            *outData = (unsigned char*)data;
            *outDataLen = dataLen;
            return originFormat;
        }
        
        switch (originFormat)
        {
            case PixelFormat::I8:
                return convertI8ToFormat(data, dataLen, format, outData, outDataLen);
            case PixelFormat::AI88:
                return convertAI88ToFormat(data, dataLen, format, outData, outDataLen);
            case PixelFormat::RGB888:
                return convertRGB888ToFormat(data, dataLen, format, outData, outDataLen);
            case PixelFormat::RGBA8888:
                return convertRGBA8888ToFormat(data, dataLen, format, outData, outDataLen);
            case PixelFormat::RGB5A1:
                return convertRGB5A1ToFormat(data, dataLen, format, outData, outDataLen);
            case PixelFormat::RGB565:
                return convertRGB565ToFormat(data, dataLen, format, outData, outDataLen);
#ifdef CC_USE_METAL
            case PixelFormat::RGBA4444:
                return convertRGBA4444ToFormat(data, dataLen, format, outData, outDataLen);
            case PixelFormat::A8:
                return convertA8ToFormat(data, dataLen, format, outData, outDataLen);
                
#endif
            case PixelFormat::BGRA8888:
                return convertBGRA8888ToFormat(data, dataLen, format, outData, outDataLen);
            default:
                CCLOG("unsupported conversion from format %d to format %d", static_cast<int>(originFormat), static_cast<int>(format));
                *outData = (unsigned char*)data;
                *outDataLen = dataLen;
                return originFormat;
        }
    }
}
}

NS_CC_END