axmol/cocos2dx/platform/android/CCXUIImage_android.cpp

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

http://www.cocos2d-x.org

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#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, tImageFormat 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 kImageFormatPNG:
		    // use libpng load image
		    bRet = loadPngFromStream(pBuffer, nSize);
		    break;
	    case kImageFormatJPG:
		    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