axmol/cocos2dx/platform/uphone/CCXUIImage_uphone.cpp

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

http://www.cocos2d-x.org

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#include "CCXUIImage_uphone.h"

#include <TG3.h>

#include "png.h"

// in order to compile correct in andLinux, because ssTypes(uphone)
// and jmorecfg.h all typedef xxx INT32
#define  QGLOBAL_H
#include "jpeglib.h"
#undef   QGLOBAL_H

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

#define CCX_RGB_PREMULTIPLY_APLHA(vr, vg, vb, va) \
	(ColorRefType)(((UInt32)((UInt8)(vr) * ((UInt8)(va) + 1)) >> 8) | \
	((UInt32)((UInt8)(vg) * ((UInt8)(va) + 1) >> 8) << 8) | \
	((UInt32)((UInt8)(vb) * ((UInt8)(va) + 1) >> 8) << 16) | \
	((UInt32)(UInt8)(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_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 = true;//m_pBitmap->HasAlphaData();
 		// uphone only support predefined
 		m_imageInfo.isPremultipliedAlpha = true;
 		m_imageInfo.bitsPerComponent = m_pBitmap->GetDepth() / 4;
	}
}

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, tImageFormat imageType)
{
	bool bRet = false;

	switch (imageType)
	{
	case kImageFormatPNG:
		// use libpng load image
		bRet =  loadPng(strPath.c_str());
		break;
	case kImageFormatJPG:
		bRet = loadJpg(strPath.c_str());
		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::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;
	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, 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
	// 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, NULL, NULL);
	png_destroy_info_struct(png_ptr, &info_ptr);

	return true;
}

bool UIImage::loadJpg(const char *strFileName)
{
	/* these are standard libjpeg structures for reading(decompression) */
	struct jpeg_decompress_struct cinfo;
	struct jpeg_error_mgr jerr;
	/* libjpeg data structure for storing one row, that is, scanline of an image */
	JSAMPROW row_pointer[1];

	FILE *infile = fopen( strFileName, "rb" );
	unsigned long location = 0;
	unsigned int i = 0;

	if ( !infile )
	{
		return false;
	}

	/* here we set up the standard libjpeg error handler */
	cinfo.err = jpeg_std_error( &jerr );

	/* setup decompression process and source, then read JPEG header */
	jpeg_create_decompress( &cinfo );

	/* this makes the library read from infile */
	jpeg_stdio_src( &cinfo, infile );

	/* reading the image header which contains image information */
	jpeg_read_header( &cinfo, true );

	// we only support RGB or grayscale
	if (cinfo.jpeg_color_space != JCS_RGB)
	{
		if (cinfo.jpeg_color_space == JCS_GRAYSCALE || cinfo.jpeg_color_space == JCS_YCbCr)
		{
            cinfo.out_color_space = JCS_RGB;
		}
	}
	else
	{
		return false;
	}

	/* Start decompression jpeg here */
	jpeg_start_decompress( &cinfo );

	/* init image info */
	m_imageInfo.width = cinfo.image_width;
	m_imageInfo.height = cinfo.image_height;
	m_imageInfo.hasAlpha = false;
	m_imageInfo.isPremultipliedAlpha = false;
	m_imageInfo.bitsPerComponent = 8;
	m_imageInfo.data = new unsigned char[cinfo.output_width*cinfo.output_height*cinfo.output_components];

	/* now actually read the jpeg into the raw buffer */
	row_pointer[0] = new unsigned char[cinfo.output_width*cinfo.output_components];

	/* read one scan line at a time */
	while( cinfo.output_scanline < cinfo.image_height )
	{
		jpeg_read_scanlines( &cinfo, row_pointer, 1 );
		for( i=0; i<cinfo.image_width*cinfo.num_components;i++) 
			m_imageInfo.data[location++] = row_pointer[0][i];
	}

	/* wrap up decompression, destroy objects, free pointers and close open files */
	jpeg_finish_decompress( &cinfo );
	jpeg_destroy_decompress( &cinfo );
	delete row_pointer[0];
	fclose( infile );

	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