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 "platform/CCFileUtils.h"
#include "jni/JniHelper.h"

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

// prototype
void swapAlphaChannel(unsigned int *pImageMemory, unsigned int numPixels);

NS_CC_BEGIN

class BitmapDC
{
public:

    BitmapDC()
    : _data(NULL)
    , _width(0)
    , _height(0)
    {
    }

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

    bool getBitmapFromJavaShadowStroke(	const char *text,
    									int nWidth,
    									int nHeight,
    									Image::TextAlign eAlignMask,
    									const char * pFontName,
    									float fontSize,
    									float textTintR 		= 1.0,
    									float textTintG 		= 1.0,
    									float textTintB 		= 1.0,
    									bool shadow 			= false,
    									float shadowDeltaX 		= 0.0,
    									float shadowDeltaY 		= 0.0,
    									float shadowBlur 		= 0.0,
    									float shadowOpacity 	= 0.0,
    									bool stroke 			= false,
    									float strokeColorR 		= 0.0,
    									float strokeColorG 		= 0.0,
    									float strokeColorB 		= 0.0,
    									float strokeSize 		= 0.0 )
    {
           JniMethodInfo methodInfo;
           if (! JniHelper::getStaticMethodInfo(methodInfo, "org/cocos2dx/lib/Cocos2dxBitmap", "createTextBitmapShadowStroke",
               "(Ljava/lang/String;Ljava/lang/String;IFFFIIIZFFFFZFFFF)V"))
           {
               CCLOG("%s %d: error to get methodInfo", __FILE__, __LINE__);
               return false;
           }
        
        
        
           // Do a full lookup for the font path using FileUtils in case the given font name is a relative path to a font file asset,
           // or the path has been mapped to a different location in the app package:
           std::string fullPathOrFontName = FileUtils::getInstance()->fullPathForFilename(pFontName);
        
		   // If the path name returned includes the 'assets' dir then that needs to be removed, because the android.content.Context
		   // requires this portion of the path to be omitted for assets inside the app package.
		   if (fullPathOrFontName.find("assets/") == 0)
		   {
               fullPathOrFontName = fullPathOrFontName.substr(strlen("assets/"));	// Chop out the 'assets/' portion of the path.
           }

           /**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(fullPathOrFontName.c_str());

           methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, jstrText,
               jstrFont, (int)fontSize, textTintR, textTintG, textTintB, eAlignMask, nWidth, nHeight, shadow, shadowDeltaX, -shadowDeltaY, shadowBlur, shadowOpacity, stroke, strokeColorR, strokeColorG, strokeColorB, strokeSize);

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

           return true;
    }


    bool getBitmapFromJava(const char *text, int nWidth, int nHeight, Image::TextAlign eAlignMask, const char * pFontName, float fontSize)
    {
    	return  getBitmapFromJavaShadowStroke(	text, nWidth, nHeight, eAlignMask, pFontName, fontSize );
    }

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

public:
    int _width;
    int _height;
    unsigned char *_data;
    JNIEnv *env;
};

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

bool Image::initWithString(
                               const char *    pText, 
                               int             nWidth/* = 0*/, 
                               int             nHeight/* = 0*/,
                               TextAlign      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._data to _data in order to save time
        _data = dc._data;
        CC_BREAK_IF(! _data);

        _width    = (short)dc._width;
        _height   = (short)dc._height;
        _hasAlpha = true;
        _preMulti = true;
        _bitsPerComponent = 8;

        bRet = true;
    } while (0);

    return bRet;
}

bool Image::initWithStringShadowStroke(
                                         const char * pText,
                                         int         nWidth ,
                                         int         nHeight ,
                                         TextAlign eAlignMask ,
                                         const char * pFontName ,
                                         int          nSize ,
                                         float        textTintR,
                                         float        textTintG,
                                         float        textTintB,
                                         bool shadow,
                                         float shadowOffsetX,
                                         float shadowOffsetY,
                                         float shadowOpacity,
                                         float shadowBlur,
                                         bool  stroke,
                                         float strokeR,
                                         float strokeG,
                                         float strokeB,
                                         float strokeSize)
{
	 bool bRet = false;
	    do
	    {
	        CC_BREAK_IF(! pText);

	        BitmapDC &dc = sharedBitmapDC();


	        CC_BREAK_IF(! dc.getBitmapFromJavaShadowStroke(pText, nWidth, nHeight, eAlignMask, pFontName,
	        											   nSize, textTintR, textTintG, textTintB, shadow,
	        											   shadowOffsetX, shadowOffsetY, shadowBlur, shadowOpacity,
	        											   stroke, strokeR, strokeG, strokeB, strokeSize ));


	        // assign the dc._data to _data in order to save time
	        _data = dc._data;

	        CC_BREAK_IF(! _data);

	        _width    = (short)dc._width;
	        _height   = (short)dc._height;
	        _hasAlpha = true;
	        _preMulti = true;
	        _bitsPerComponent = 8;

	        // swap the alpha channel (ARGB to RGBA)
	        swapAlphaChannel((unsigned int *)_data, (_width * _height) );

	        // ok
	        bRet = true;

	    } while (0);

	    return bRet;
}

NS_CC_END

// swap the alpha channel in an 32 bit image (from ARGB to RGBA)
void swapAlphaChannel(unsigned int *pImageMemory, unsigned int numPixels)
{
	for(int c = 0; c < numPixels; ++c, ++pImageMemory)
	{
		// copy the current pixel
		unsigned int currenPixel =  (*pImageMemory);
		// swap channels and store back
		char *pSource = (char *) 	&currenPixel;
		*pImageMemory = (pSource[0] << 24) | (pSource[3]<<16) | (pSource[2]<<8) | pSource[1];
	}
}

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

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