axmol/cocos2dx/platform/uphone/CCXUIImage_uphone.cpp

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Copyright (c) 2010 cocos2d-x.org

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#include "CCXUIImage_uphone.h"

//#include <ImageToolKit/IT_ImageLoader.h> 
#include <TG3.h>
#include "png.h"

//using namespace ImageToolKit;
using namespace std;
namespace   cocos2d {

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_pBitmap = NULL;

	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(TBitmap *bitmap)
{
	if (bitmap)
	{
		m_pBitmap = bitmap->DupBitmapTo32();

		// init imageinfo
 		m_imageInfo.data = m_pBitmap->GetDataPtr();
 		m_imageInfo.height = m_pBitmap->GetHeight();
 		m_imageInfo.width = m_pBitmap->GetWidth();
 		m_imageInfo.hasAlpha = m_pBitmap->HasAlphaData();
 		// uphone only support predefined
 		m_imageInfo.isPremultipliedAlpha = true;
 		m_imageInfo.bitsPerComponent = m_pBitmap->GetDepth();
	}
}

UIImage::UIImage(int nX, int nY, void *buffer)
{

}

UIImage::~UIImage(void)
{
	if (m_pBitmap)
	{
		// the m_imageInfo's data points to m_pBitmap,
		// so we don't release m_imageInfo's data
		m_pBitmap->Destroy();
	}
	else
	{
		if (m_imageInfo.data)
		{
			delete []m_imageInfo.data;
		}
	}
}

bool UIImage::initWithContentsOfFile(const string &strPath)
{
    // use libpng load image
    return loadPng(strPath.c_str());
}

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;
}

// 0 -> it is a mask
// 1 -> other
int UIImage::CGImageGetColorSpace(void)
{
	int nRet = 1;

	if (m_imageInfo.bitsPerComponent == 8)
	{
		nRet = 0;
	}

	return nRet;
}

unsigned char* UIImage::getRGBA8888Data(void)
{
	return m_imageInfo.data;
}

bool UIImage::loadPng(const char* strFileName)
{
    FILE *fp;
	unsigned char *buffer = NULL;
    bool bRet = true;
 
    fp = NULL;

	do 
	{
		// open file
		fp = fopen(strFileName, "rb");
		if (!fp)
		{
			bRet = false;
			break;
		}

		// 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];
		if (! buffer)
		{
			bRet = false;
			break;
		}

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

		bRet = loadPngFromStream(buffer, size);
		delete[] buffer;
	} while (0);
    
	if (fp)
	{
		fclose(fp);
	}

    return bRet;
}

bool UIImage::loadPngFromStream(unsigned char *data, int nLength)
{
	char                header[8]; 
	png_structp         png_ptr;
	png_infop           info_ptr;
	Int32               pos;
	Int32               interlaceType;
	png_bytep           * rowPointers;
	tImageSource        imageSource;

	pos = 0;

	// 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, NULL, NULL);
		png_destroy_info_struct(png_ptr, &info_ptr);
		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 info
	png_read_info(png_ptr, info_ptr);

	// init image info
	m_imageInfo.height = info_ptr->height;
	m_imageInfo.width = info_ptr->width;
	m_imageInfo.isPremultipliedAlpha = false;
	// we use CCX_RGA or CCX_RGB to save data
	// so the bitsPerComponet is 32, and it also
	// has the alpha data
	m_imageInfo.bitsPerComponent = 32;
	m_imageInfo.hasAlpha = true;

	// convert to appropriate format, we now only support RGBA8888
	if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
	{
		png_set_packing(png_ptr);
		png_set_palette_to_rgb(png_ptr);
	}
	if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY && info_ptr->bit_depth < 8)
	{
		png_set_expand_gray_1_2_4_to_8(png_ptr);
	}
	if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
	{
		png_set_gray_to_rgb(png_ptr);
	}
	if (info_ptr->bit_depth == 16)
	{
		png_set_strip_16(png_ptr);
	}

	// expand paletted or RGB images with transparency to full alpha channels so the data will be
	// available as RGBA quatets
	if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
	{
		png_set_tRNS_to_alpha(png_ptr);
	}

	// add the alpha channel if it has not
	if (info_ptr->color_type == PNG_COLOR_TYPE_RGB || info_ptr->color_type == PNG_COLOR_TYPE_GRAY)
	{
		png_set_add_alpha(png_ptr, 255, PNG_FILLER_AFTER);
	}

	// allocate memory and read data
	m_imageInfo.data = new unsigned char[m_imageInfo.height * m_imageInfo.width * 4];
	rowPointers = (png_bytep*)png_mem_alloc(sizeof(png_bytep) * m_imageInfo.height);
	for (int i = 0; i < m_imageInfo.height; ++i)
	{
		rowPointers[i] = (png_bytep)png_mem_alloc(m_imageInfo.width * 4);
	}
	png_read_image(png_ptr, rowPointers);

	// copy data to image info
	int bytesPerRow = m_imageInfo.width * 4;
	for (int j = 0; j < m_imageInfo.height; ++j)
	{
		memcpy(m_imageInfo.data + j * bytesPerRow, rowPointers[j], bytesPerRow);
	}

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

	return true;
}

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