/****************************************************************************
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
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 "CCXUIImage_android.h"
#include "CCXFileUtils.h"
#include "png.h"

#include "CCXBitmapDC.h"
#include "support/file_support/FileData.h"
#include "jpeglib.h"

#include <android/log.h>

//using namespace ImageToolKit;
using namespace std;
namespace   cocos2d {
	
#define CCX_RGB_PREMULTIPLY_APLHA(vr, vg, vb, va) \
	(unsigned int)(((unsigned int)((unsigned char)(vr) * ((unsigned char)(va) + 1)) >> 8) | \
	((unsigned int)((unsigned char)(vg) * ((unsigned char)(va) + 1) >> 8) << 8) | \
	((unsigned int)((unsigned char)(vb) * ((unsigned char)(va) + 1) >> 8) << 16) | \
	((unsigned int)(unsigned char)(va) << 24))

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

// because we do not want to include "png.h" in CCXUIImage_uphone.h, so we implement
// the function as a static function
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");
	}
}

UIImage::UIImage(void)
{
	m_imageInfo.hasAlpha = false;
	m_imageInfo.isPremultipliedAlpha = false;
	m_imageInfo.height = 0;
	m_imageInfo.width = 0;
	m_imageInfo.data = NULL;
	m_imageInfo.bitsPerComponent = 0;
}

UIImage::UIImage(CCXBitmapDC * pBmpDC)
{
    do 
	{
		CCX_BREAK_IF(! pBmpDC);
		
		// init imageinfo
		int nWidth	= pBmpDC->getWidth();
		int nHeight	= pBmpDC->getHeight();
		CCX_BREAK_IF(nWidth <= 0 || nHeight <= 0);

		int nLen = nWidth * nHeight * 4;
		m_imageInfo.data = new unsigned char [nLen];
		CCX_BREAK_IF(! m_imageInfo.data);
		memcpy(m_imageInfo.data, pBmpDC->getData(), nLen);

		m_imageInfo.height		= nHeight;
		m_imageInfo.width		= nWidth;
		m_imageInfo.hasAlpha	= true;

		m_imageInfo.isPremultipliedAlpha = true;
		m_imageInfo.bitsPerComponent = 8;
	} while (0);
}

UIImage::~UIImage(void)
{
	if (m_imageInfo.data)
	{
		delete []m_imageInfo.data;
	}
}

bool UIImage::initWithContentsOfFile(const string &strPath, eImageFormat imageType)
{
	bool bRet = false;
	
	FileData data;
    unsigned long nSize  = 0;
    unsigned char* pBuffer = data.getFileData(strPath.c_str(), "rb", &nSize);

    if (pBuffer)
    {
	    switch (imageType)
	    {
	    case kCCImageFormatPNG:
		    // use libpng load image
		    bRet = loadPngFromStream(pBuffer, nSize);
		    break;
	    case kCCImageFormatJPG:
		    bRet = loadJpgFromStream(pBuffer, nSize);
		    break;
	    default:
		    // unsupported image type
		    bRet = false;
		    break;
	    }
    }

	return bRet;
}

unsigned int UIImage::width(void)
{
	return m_imageInfo.width;
}

unsigned int UIImage::height(void)
{
	return m_imageInfo.height;
}

bool UIImage::isAlphaPixelFormat(void)
{
	return m_imageInfo.hasAlpha;
}

// now, uphone only support premultiplied data
// so, we only return true
bool UIImage::isPremultipliedAlpha(void)
{
	return m_imageInfo.isPremultipliedAlpha;
}

// compute how many bits every color component 
int UIImage::CGImageGetBitsPerComponent(void)
{
	return m_imageInfo.bitsPerComponent;
}

// now we only support RGBA8888 or RGB888
// so it has color space
int UIImage::CGImageGetColorSpace(void)
{
	return 1;
}

unsigned char* UIImage::getData(void)
{
	return m_imageInfo.data;
}

bool UIImage::loadPngFromStream(unsigned char *data, int nLength)
{
	char                header[8]; 
	png_structp         png_ptr;
	png_infop           info_ptr;
	png_bytep           * rowPointers;
	tImageSource        imageSource;
	int					color_type;

	// read 8 bytes from the beginning of stream
	unsigned char *tmp = data;
	memcpy(header, tmp, 8);

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

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

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

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

	// set the read call back function
	imageSource.data = data;
	imageSource.size = nLength;
	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, NULL);

	png_get_IHDR(png_ptr, info_ptr, &m_imageInfo.width, &m_imageInfo.height, &m_imageInfo.bitsPerComponent, &color_type,
		NULL, NULL, NULL);

	// init image info
	m_imageInfo.isPremultipliedAlpha = true;
	m_imageInfo.hasAlpha = ( info_ptr->color_type & PNG_COLOR_MASK_ALPHA ) ? true : false;

	// allocate memory and read data
	int bytesPerComponent = 3;
    if (m_imageInfo.hasAlpha)
	{
		bytesPerComponent = 4;
	}
	m_imageInfo.data = new unsigned char[m_imageInfo.height * m_imageInfo.width * bytesPerComponent];
	rowPointers = png_get_rows(png_ptr, info_ptr);

	// copy data to image info
	int bytesPerRow = m_imageInfo.width * bytesPerComponent;
	if(m_imageInfo.hasAlpha)
	{
		unsigned int *tmp = (unsigned int *)m_imageInfo.data;
		for(unsigned int i = 0; i < m_imageInfo.height; 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 < m_imageInfo.height; ++j)
		{
			memcpy(m_imageInfo.data + j * bytesPerRow, rowPointers[j], bytesPerRow);
		}
	}

	// release
	png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

	return true;
}

bool UIImage::loadJpgFromStream(unsigned char *data, unsigned long nSize)
{
	/// @todo: libjpeg of android not support  jpeg_mem_src()
	return false;
}

bool UIImage::save(const std::string &strFileName, int nFormat)
{
	/// @todo uiimage::save
	return false;
}
bool UIImage::initWithData(unsigned char *pBuffer, int nLength)
{
	return loadPngFromStream(pBuffer, nLength);
}

bool UIImage::initWithBuffer(int tx, int ty, unsigned char *pBuffer)
{
	/// @todo
	return false;
}


}//namespace   cocos2d