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
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.
****************************************************************************/

#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;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), (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);
			}
		}
	}
};