axmol/cocos2dx/platform/CCImage.h

/****************************************************************************
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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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#ifndef __CC_IMAGE_H__
#define __CC_IMAGE_H__

#include "cocoa/CCObject.h"
#include "textures/CCTexture2D.h"

// premultiply alpha, or the effect will wrong when want to use other pixel format in Texture2D,
// such as RGB888, RGB5A1
#define CC_RGB_PREMULTIPLY_ALPHA(vr, vg, vb, va) \
    (unsigned)(((unsigned)((unsigned char)(vr) * ((unsigned char)(va) + 1)) >> 8) | \
    ((unsigned)((unsigned char)(vg) * ((unsigned char)(va) + 1) >> 8) << 8) | \
    ((unsigned)((unsigned char)(vb) * ((unsigned char)(va) + 1) >> 8) << 16) | \
    ((unsigned)(unsigned char)(va) << 24))

NS_CC_BEGIN

/**
 * @addtogroup platform
 * @{
 */

/**
 @brief Structure which can tell where mipmap begins and how long is it
 */
typedef struct _MipmapInfo
{
    unsigned char* address;
    int len;
}MipmapInfo;

class CC_DLL Image : public Object
{
public:
    friend class TextureCache;
    
    Image();
    virtual ~Image();

    /** Supported formats for Image */
    enum class Format
    {
        //! JPEG
        JPG,
        //! PNG
        PNG,
        //! TIFF
        TIFF,
        //! WebP
        WEBP,
        //! PVR
        PVR,
        //! ETC
        ETC,
        //! S3TC
        S3TC,
        //! Raw Data
        RAW_DATA,
        //! Unknown format
        UNKOWN
    };

    enum class TextAlign
    {
        CENTER        = 0x33, ///< Horizontal center and vertical center.
        TOP           = 0x13, ///< Horizontal center and vertical top.
        TOP_RIGHT     = 0x12, ///< Horizontal right and vertical top.
        RIGHT         = 0x32, ///< Horizontal right and vertical center.
        BOTTOM_RIGHT = 0x22, ///< Horizontal right and vertical bottom.
        BOTTOM        = 0x23, ///< Horizontal center and vertical bottom.
        BOTTOM_LEFT  = 0x21, ///< Horizontal left and vertical bottom.
        LEFT          = 0x31, ///< Horizontal left and vertical center.
        TOP_LEFT      = 0x11, ///< Horizontal left and vertical top.
    };
    
    /**
    @brief Load the image from the specified path.
    @param path   the absolute file path.
    @return true if loaded correctly.
    */
    bool initWithImageFile(const char *path);

    /**
    @brief Load image from stream buffer.
    @param data  stream buffer which holds the image data.
    @param dataLen  data length expressed in (number of) bytes.
    @return true if loaded correctly.
    */
    bool initWithImageData(const void * data, int dataLen);

    // @warning kFmtRawData only support RGBA8888
    bool initWithRawData(const void * data, int dataLen, int width, int height, int bitsPerComponent, bool preMulti = false);

    /**
    @brief Create image with specified string.
    @param text       the text the image will show (cannot be nil).
    @param width      the image width, if 0, the width will match the text's width.
    @param height     the image height, if 0, the height will match the text's height.
    @param alignMask  the test Alignment
    @param fontName   the name of the font used to draw the text. If nil, use the default system font.
    @param size       the font size, if 0, use the system default size.
    */
    bool initWithString(
        const char *    text,
        int             width = 0,
        int             height = 0,
        TextAlign       alignMask = TextAlign::CENTER,
        const char *    fontName = 0,
        int             size = 0);
    
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) || (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    
        bool initWithStringShadowStroke(
                                            const char *    pText,
                                            int             nWidth      = 0,
                                            int             nHeight     = 0,
                                            TextAlign       eAlignMask  = TextAlign::CENTER,
                                            const char *    pFontName   = 0,
                                            int             nSize       = 0,
                                            float           textTintR   = 1,
                                            float           textTintG   = 1,
                                            float           textTintB   = 1,
                                            bool shadow                 = false,
                                            float shadowOffsetX         = 0.0,
                                            float shadowOffsetY         = 0.0,
                                            float shadowOpacity         = 0.0,
                                            float shadowBlur            = 0.0,
                                            bool  stroke                =  false,
                                            float strokeR               = 1,
                                            float strokeG               = 1,
                                            float strokeB               = 1,
                                            float strokeSize            = 1
                                        
                                        );
    
    #endif
    
    
    // Getters
    inline unsigned char *   getData()               { return _data; }
    inline int               getDataLen()            { return _dataLen; }
    inline Format            getFileType()           {return _fileType; }
    inline Texture2D::PixelFormat getRenderFormat()    { return _renderFormat; }
    inline int               getWidth()              { return _width; }
    inline int               getHeight()             { return _height; }
    inline bool              isPremultipliedAlpha()  { return _preMulti;   }
    inline int               getNumberOfMipmaps()    { return _numberOfMipmaps; }
    inline MipmapInfo*       getMipmaps()            { return _mipmaps; }
    inline bool              hasPremultipliedAlpha() { return _hasPremultipliedAlpha; }

    int                      getBitPerPixel();
    bool                     hasAlpha();
    bool                     isCompressed();


    /**
     @brief    Save Image data to the specified file, with specified format.
     @param    filePath        the file's absolute path, including file suffix.
     @param    isToRGB        whether the image is saved as RGB format.
     */
    bool saveToFile(const char *filePath, bool isToRGB = true);

protected:
    
    bool initWithJpgData(const void *data, int dataLen);
    bool initWithPngData(const void *data, int dataLen);
    bool initWithTiffData(const void *data, int dataLen);
    bool initWithWebpData(const void *data, int dataLen);
    bool initWithPVRData(const void *data, int dataLen);
    bool initWithPVRv2Data(const void *data, int dataLen);
    bool initWithPVRv3Data(const void *data, int dataLen);
    bool initWithETCData(const void *data, int dataLen);
    bool initWithS3TCData(const void *data, int dataLen);

    bool saveImageToPNG(const char *filePath, bool isToRGB = true);
    bool saveImageToJPG(const char *filePath);
    
private:
    /**
     @brief Determine how many mipmaps can we have.
     Its same as define but it respects namespaces
     */
    static const int MIPMAP_MAX = 16;
    unsigned char *_data;
    int _dataLen;
    int _width;
    int _height;
    Format _fileType;
    Texture2D::PixelFormat _renderFormat;
    bool _preMulti;
    MipmapInfo _mipmaps[MIPMAP_MAX];   // pointer to mipmap images
    int _numberOfMipmaps;
    // false if we cann't auto detect the image is premultiplied or not.
    bool _hasPremultipliedAlpha;


private:
    // noncopyable
    Image(const Image&    rImg);
    Image & operator=(const Image&);
    
    /*
     @brief The same result as with initWithImageFile, but thread safe. It is caused by
     loadImage() in TextureCache.cpp.
     @param fullpath  full path of the file.
     @param imageType the type of image, currently only supporting two types.
     @return  true if loaded correctly.
     */
    bool initWithImageFileThreadSafe(const char *fullpath);
    
    Format detectFormat(const void* data, int dataLen);
    bool isPng(const void *data, int dataLen);
    bool isJpg(const void *data, int dataLen);
    bool isTiff(const void *data, int dataLen);
    bool isWebp(const void *data, int dataLen);
    bool isPvr(const void *data, int dataLen);
    bool isEtc(const void *data, int dataLen);
    bool isS3TC(const void *data,int dataLen);

};

// end of platform group
/// @}

NS_CC_END

#endif    // __CC_IMAGE_H__