[android] fixed #353: support jpg on android

HelloWorld/HelloWorldScene.cpp

@@ -62,7 +62,7 @@ bool HelloWorld::init()
 	this->addChild(pLabel, 1);
 
 	// add "HelloWorld" splash screen"
-	CCSprite* pSprite = CCSprite::spriteWithFile("HelloWorld.png");
+	CCSprite* pSprite = CCSprite::spriteWithFile("HelloWorld.jpg");
 
 	// position the sprite on the center of the screen
 	pSprite->setPosition( ccp(size.width/2, size.height/2) );

cocos2dx/platform/android/CCXUIImage_android.cpp

@@ -32,6 +32,9 @@ THE SOFTWARE.
 
 #include <android/log.h>
 
+#define  LOG_TAG    "UIImage"
+#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
+
 //using namespace ImageToolKit;
 using namespace std;
 namespace   cocos2d {
@@ -279,8 +282,68 @@ bool UIImage::loadPngFromStream(unsigned char *data, int nLength)
 
 bool UIImage::loadJpgFromStream(unsigned char *data, unsigned long nSize)
 {
-	/// @todo: libjpeg of android not support  jpeg_mem_src()
+	/* 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];
+
+	unsigned long location = 0;
+	unsigned int i = 0;
+
+	/* 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_mem_src( &cinfo, data, nSize );
+
+	/* 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];
+
+	return true;
 }
 
 bool UIImage::save(const std::string &strFileName, int nFormat)

cocos2dx/platform/android/third_party/libs/libjpeg.a.REMOVED.git-id

@@ -1 +1 @@
-017fff05a72479d95819cf89ac5cf6125d562960
+b595fbd4d9aca89e30aab2b4216457f20ec58b9d