axmol/cocos2dx/platform/android/CCImage.cpp

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

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//#define COCOS2D_DEBUG 1

#define __CC_PLATFORM_IMAGE_CPP__
#include "platform/CCImageCommon_cpp.h"
#include "platform/CCPlatformMacros.h"
#include "platform/CCImage.h"
#include "jni/JniHelper.h"

#include <android/log.h>
#include <string.h>
#include <jni.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)
    {
        JniMethodInfo methodInfo;
        if (! JniHelper::getStaticMethodInfo(methodInfo, "org/cocos2dx/lib/Cocos2dxBitmap", "createTextBitmap", 
            "(Ljava/lang/String;Ljava/lang/String;IIII)V"))
        {
            CCLOG("%s %d: error to get methodInfo", __FILE__, __LINE__);
            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 approach to decrease the jni call number
        */
        jstring jstrText = methodInfo.env->NewStringUTF(text);
        jstring jstrFont = methodInfo.env->NewStringUTF(pFontName);

        methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, jstrText, 
            jstrFont, (int)fontSize, eAlignMask, nWidth, nHeight);

        methodInfo.env->DeleteLocalRef(jstrText);
        methodInfo.env->DeleteLocalRef(jstrFont);
        methodInfo.env->DeleteLocalRef(methodInfo.classID);

        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];
        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);
            }
        }
    }
};