axmol/cocos2dx/platform/android/CCImage_android.cpp

/****************************************************************************
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
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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THE SOFTWARE.
****************************************************************************/

#define COCOS2D_DEBUG 1

#include <android/log.h>
#include <string.h>
#include <jni.h>

#include "CCPlatformMacros.h"
#include "Cocos2dJni.h"
#include "CCImage.h"


NS_CC_BEGIN;

class BitmapDC
{
public:
    BitmapDC()
	: m_pData(NULL)
	, m_nWidth(0)
	, m_nHeight(0)
    {
    }

    ~BitmapDC(void)
    {
		if (m_pData)
		{
			delete [] m_pData;
		}
    }

	bool getBitmapFromJava(const char *text, int nWidth, int nHeight, CCImage::ETextAlign eAlignMask, const char * pFontName, float fontSize)
	{
		// get env
		if (gJavaVM->GetEnv((void**)&env, JNI_VERSION_1_4) <0 )
		{
			if (gJavaVM->AttachCurrentThread(&env, NULL) < 0)
			{
				return false;
			}
		}

		// get class
		jclass mClass = env->FindClass("org/cocos2dx/lib/Cocos2dxBitmap");
		if (! mClass)
		{
			CCLOG("can not find org.cocos2dx.Cocos2dJNI");
			return false;
		}

		// get method of createBitmap
		jmethodID midCreateTextBitmap = env->GetStaticMethodID(mClass, "createTextBitmap", "(Ljava/lang/String;Ljava/lang/String;II)V");
		if (! midCreateTextBitmap)
		{
			CCLOG("can not find method createTextBitmap");
			return false;
		}

		/**create bitmap
		 * this method call Cococs2dx.createBitmap()(java code) to create the bitmap, the java code
		 * will call Java_org_cocos2dx_lib_Cocos2dxBitmap_nativeInitBitmapDC() to init the width, height
		 * and data.
		 * use this appoach to decrease the jni call number
		*/
		env->CallStaticVoidMethod(mClass, midCreateTextBitmap, env->NewStringUTF(text), env->NewStringUTF(pFontName), 
			(int)fontSize, eAlignMask);

		return true;
	}

	// ARGB -> RGBA
	unsigned int swapAlpha(unsigned int value)
	{
		return ((value << 8 & 0xffffff00) | (value >> 24 & 0x000000ff));
	}

public:
	int m_nWidth;
	int m_nHeight;
	unsigned char *m_pData;
	JNIEnv *env;
};

static BitmapDC& sharedBitmapDC()
{
    static BitmapDC s_BmpDC;
    return s_BmpDC;
}

bool CCImage::initWithString(
                               const char *    pText, 
                               int             nWidth/* = 0*/, 
                               int             nHeight/* = 0*/,
                               ETextAlign      eAlignMask/* = kAlignCenter*/,
                               const char *    pFontName/* = nil*/,
                               int             nSize/* = 0*/)
{
    bool bRet = false;

    do 
    {
        CC_BREAK_IF(! pText);
		
        BitmapDC &dc = sharedBitmapDC();

		CC_BREAK_IF(! dc.getBitmapFromJava(pText, nWidth, nHeight, eAlignMask, pFontName, nSize));

		// assign the dc.m_pData to m_pData in order to save time
		m_pData = dc.m_pData;
		CC_BREAK_IF(! m_pData);

		m_nWidth    = (short)dc.m_nWidth;
		m_nHeight   = (short)dc.m_nHeight;
		m_bHasAlpha = true;
		m_bPreMulti = true;
		m_nBitsPerComponent = 8;

		bRet = true;
    } while (0);

    return bRet;
}

NS_CC_END;

// this method is called by Cocos2dxBitmap
extern "C"
{
	/**
	* this method is called by java code to init width, height and pixels data
	*/
	void Java_org_cocos2dx_lib_Cocos2dxBitmap_nativeInitBitmapDC(JNIEnv*  env, jobject thiz, int width, int height, jbyteArray pixels)
	{
		int size = width * height * 4;
		cocos2d::sharedBitmapDC().m_nWidth = width;
		cocos2d::sharedBitmapDC().m_nHeight = height;
		cocos2d::sharedBitmapDC().m_pData = new unsigned char[size];
		cocos2d::sharedBitmapDC().env->GetByteArrayRegion(pixels, 0, size, (jbyte*)cocos2d::sharedBitmapDC().m_pData);

		// swap data
		unsigned int *tempPtr = (unsigned int*)cocos2d::sharedBitmapDC().m_pData;
		unsigned int tempdata = 0;
		for (int i = 0; i < height; ++i)
		{
			for (int j = 0; j < width; ++j)
			{
				tempdata = *tempPtr;
				*tempPtr++ = cocos2d::sharedBitmapDC().swapAlpha(tempdata);
			}
		}
	}
};