axmol/cocos/renderer/CCTexture2D.h

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Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __CCTEXTURE2D_H__
#define __CCTEXTURE2D_H__

#include <string>
#include <map>
#include <unordered_map>

#include "base/CCRef.h"
#include "math/CCGeometry.h"
#include "base/ccTypes.h"

NS_CC_BEGIN

class Image;
class NinePatchInfo;
class SpriteFrame;
typedef struct _MipmapInfo MipmapInfo;

namespace ui
{
    class Scale9Sprite;
}

namespace backend {
    class Texture;
}

/**
 * @addtogroup _2d
 * @{
 */

//CONSTANTS:

//CLASS INTERFACES:

/** 
* @brief Texture2D class. This class allows to easily create OpenGL 2D textures from images, text or raw data.
* The created Texture2D object will always have power-of-two dimensions.
* Depending on how you create the Texture2D object, the actual image area of the texture might be smaller than the texture dimensions i.e. "contentSize" != (pixelsWide, pixelsHigh) and (maxS, maxT) != (1.0, 1.0).
* Be aware that the content of the generated textures will be upside-down!
*/
class CC_DLL Texture2D : public Ref
{
public:
    /** @typedef Texture2D::PixelFormat
     Possible texture pixel formats
     */
    enum class PixelFormat
    {
        //! auto detect the type
        AUTO,
        //! 32-bit texture: BGRA8888
        BGRA8888,
        //! 32-bit texture: RGBA8888
        RGBA8888,
        //! 24-bit texture: RGBA888
        RGB888,
        //! 16-bit texture without Alpha channel
        RGB565,
        //! 8-bit textures used as masks
        A8,
        //! 8-bit intensity texture
        I8,
        //! 16-bit textures used as masks
        AI88,
        //! 16-bit textures: RGBA4444
        RGBA4444,
        //! 16-bit textures: RGB5A1
        RGB5A1,
        //! 4-bit PVRTC-compressed texture: PVRTC4
        PVRTC4,
        //! 4-bit PVRTC-compressed texture: PVRTC4 (has alpha channel)
        PVRTC4A,
        //! 2-bit PVRTC-compressed texture: PVRTC2
        PVRTC2,
        //! 2-bit PVRTC-compressed texture: PVRTC2 (has alpha channel)
        PVRTC2A,
        //! ETC-compressed texture: ETC
        ETC,
        //! S3TC-compressed texture: S3TC_Dxt1
        S3TC_DXT1,
        //! S3TC-compressed texture: S3TC_Dxt3
        S3TC_DXT3,
        //! S3TC-compressed texture: S3TC_Dxt5
        S3TC_DXT5,
        //! ATITC-compressed texture: ATC_RGB
        ATC_RGB,
        //! ATITC-compressed texture: ATC_EXPLICIT_ALPHA
        ATC_EXPLICIT_ALPHA,
        //! ATITC-compressed texture: ATC_INTERPOLATED_ALPHA
        ATC_INTERPOLATED_ALPHA,
        //! Default texture format: AUTO
        
        MTL_B5G6R5,
        //MTL_A1BGR5,
        MTL_BGR5A1,
        MTL_ABGR4,
        
        DEFAULT = AUTO,
        
        NONE = -1
    };
    
    
    struct PixelFormatInfo {

        PixelFormatInfo(GLenum anInternalFormat, GLenum aFormat, GLenum aType, int aBpp, bool aCompressed, bool anAlpha)
            : internalFormat(anInternalFormat)
            , format(aFormat)
            , type(aType)
            , bpp(aBpp)
            , compressed(aCompressed)
            , alpha(anAlpha)
        {}

        GLenum internalFormat;
        GLenum format;
        GLenum type;
        int bpp;
        bool compressed;
        bool alpha;
    };
    
    typedef std::map<Texture2D::PixelFormat, const PixelFormatInfo> PixelFormatInfoMap;
    
    /**
     Extension to set the Min / Mag filter
     */
    typedef struct _TexParams {
        GLuint    minFilter;
        GLuint    magFilter;
        GLuint    wrapS;
        GLuint    wrapT;
    }TexParams;
    
public:
    /** sets the default pixel format for UIImagescontains alpha channel.
     
     @param format
     If the UIImage contains alpha channel, then the options are:
     - generate 32-bit textures: Texture2D::PixelFormat::RGBA8888 (default one)
     - generate 24-bit textures: Texture2D::PixelFormat::RGB888
     - generate 16-bit textures: Texture2D::PixelFormat::RGBA4444
     - generate 16-bit textures: Texture2D::PixelFormat::RGB5A1
     - generate 16-bit textures: Texture2D::PixelFormat::RGB565
     - generate 8-bit textures: Texture2D::PixelFormat::A8 (only use it if you use just 1 color)

     How does it work ?
     - If the image is an RGBA (with Alpha) then the default pixel format will be used (it can be a 8-bit, 16-bit or 32-bit texture)
     - If the image is an RGB (without Alpha) then: If the default pixel format is RGBA8888 then a RGBA8888 (32-bit) will be used. Otherwise a RGB565 (16-bit texture) will be used.

     This parameter is not valid for PVR / PVR.CCZ images.

     @since v0.8
     */
    static void setDefaultAlphaPixelFormat(Texture2D::PixelFormat format);

    /** Returns the alpha pixel format.
     @since v0.8
     */
    static Texture2D::PixelFormat getDefaultAlphaPixelFormat();
    
public:
    /**
     * @js ctor
     */
    Texture2D();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~Texture2D();

    /** Initializes with a texture2d with data.
     
     @param data Specifies a pointer to the image data in memory.
     @param dataLen The image data length.
     @param pixelFormat The image pixelFormat.
     @param pixelsWide The image width.
     @param pixelsHigh The image height.
     @param contentSize The image content size.
     * @js NA
     * @lua NA
     */
    bool initWithData(const void *data, ssize_t dataLen, Texture2D::PixelFormat pixelFormat, int pixelsWide, int pixelsHigh, const Size& contentSize) { return initWithData(data, dataLen, pixelFormat, pixelFormat, pixelsWide, pixelsHigh, contentSize);}

    /** Initializes with a texture2d with data.
     
     @param data Specifies a pointer to the image data in memory.
     @param dataLen The image data length.
     @param pixelFormat The image pixelFormat.
     @param renderFormat The format converted to.
     @param pixelsWide The image width.
     @param pixelsHigh The image height.
     @param contentSize The image content size.
     * @js NA
     * @lua NA
     */
    bool initWithData(const void *data, ssize_t dataLen, Texture2D::PixelFormat pixelFormat, Texture2D::PixelFormat renderFormat, int pixelsWide, int pixelsHigh, const Size& contentSize);
    
    /** Initializes with mipmaps. 
     
     @param mipmaps Specifies a pointer to the image data in memory.
     @param mipmapsNum The mipmaps number.
     @param pixelFormat The image pixelFormat.
     @param pixelsWide The image width.
     @param pixelsHigh The image height.
     */
    bool initWithMipmaps(MipmapInfo* mipmaps, int mipmapsNum, Texture2D::PixelFormat pixelFormat, Texture2D::PixelFormat renderFormat, int pixelsWide, int pixelsHigh);
    
    /** Update with texture data.
     
     @param data Specifies a pointer to the image data in memory.
     @param offsetX Specifies a texel offset in the x direction within the texture array.
     @param offsetY Specifies a texel offset in the y direction within the texture array.
     @param width Specifies the width of the texture subimage.
     @param height Specifies the height of the texture subimage.
     */
    bool updateWithData(void *data,int offsetX,int offsetY,int width,int height);
    /**
    Drawing extensions to make it easy to draw basic quads using a Texture2D object.
    These functions require GL_TEXTURE_2D and both GL_VERTEX_ARRAY and GL_TEXTURE_COORD_ARRAY client states to be enabled.
    */
    /** Draws a texture at a given point. */
//    void drawAtPoint(const Vec2& point);
    /** Draws a texture inside a rect.*/
//    void drawInRect(const Rect& rect);

    /**
    Extensions to make it easy to create a Texture2D object from an image file.
    */
    /** 
    Initializes a texture from a UIImage object.

    We will use the format you specified with setDefaultAlphaPixelFormat to convert the image for texture.
    NOTE: It will not convert the pvr image file.
    @param image An UIImage object.
    */
    bool initWithImage(Image * image);
    
    /** 
    Initializes a texture from a UIImage object.

    We will use the format you passed to the function to convert the image format to the texture format.
    If you pass PixelFormat::Automatic, we will auto detect the image render type and use that type for texture to render.
    @param image An UIImage object.
    @param format Texture pixel formats.
    **/
    bool initWithImage(Image * image, PixelFormat format);

    /** Initializes a texture from a string with dimensions, alignment, font name and font size. 
     
     @param text A null terminated string.
     @param fontName The font name.
     @param fontSize The font size.
     @param dimensions The font dimension.
     @param hAlignment The font horizontal text alignment type.
     @param vAlignment The font vertical text alignment type.
     @param enableWrap Whether enable text wrap or not.
     @param overflow Whether shrink font size when content larger than the dimensions.
     */
    bool initWithString(const char *text,  const std::string &fontName, float fontSize, const Size& dimensions = Size(0, 0), TextHAlignment hAlignment = TextHAlignment::CENTER, TextVAlignment vAlignment = TextVAlignment::TOP, bool enableWrap = true, int overflow = 0);

    /** Initializes a texture from a string using a text definition.
     
     @param text A null terminated string.
     @param textDefinition A FontDefinition object contains font attributes.
     */
    bool initWithString(const char *text, const FontDefinition& textDefinition);
    
    //TODO: minggo: is it resaonable?
    bool initWithBackendTexture(backend::Texture* texture);

    /** Set sampler properties
    */
    void setSamplerDescriptor(const backend::SamplerDescriptor& texParams);
    
    /** Generates mipmap images for the texture.
     It only works if the texture size is POT (power of 2).
     @since v0.99.0
     */
//    TODO coulsonwang
    void generateMipmap();
    
    /** Sets antialias texture parameters:
     - GL_TEXTURE_MIN_FILTER = GL_LINEAR
     - GL_TEXTURE_MAG_FILTER = GL_LINEAR
     
     @warning Calling this method could allocate additional texture memory.
     
     @since v0.8
     */
    void setAntiAliasTexParameters();

    /** Sets alias texture parameters:
    - GL_TEXTURE_MIN_FILTER = GL_NEAREST
    - GL_TEXTURE_MAG_FILTER = GL_NEAREST

    @warning Calling this method could allocate additional texture memory.

    @since v0.8
    */
    void setAliasTexParameters();

    /** Returns the pixel format.
     @since v2.0
     */
    const char* getStringForFormat() const;

    /** Returns the bits-per-pixel of the in-memory OpenGL texture
    @since v1.0
    */
    unsigned int getBitsPerPixelForFormat() const;

    /** Helper functions that returns bits per pixels for a given format.
     @since v2.0
     */
    unsigned int getBitsPerPixelForFormat(Texture2D::PixelFormat format) const;

    /** Get content size. */
    const Size& getContentSizeInPixels();

    /** Whether or not the texture has their Alpha premultiplied. */
    bool hasPremultipliedAlpha() const;
    
    /** Whether or not the texture has mip maps.*/
    bool hasMipmaps() const;

    /** Gets the pixel format of the texture. */
    Texture2D::PixelFormat getPixelFormat() const;
    
    /** Gets the width of the texture in pixels. */
    int getPixelsWide() const;
    
    /** Gets the height of the texture in pixels. */
    int getPixelsHigh() const;
    
    /** Gets the texture name. */
    GLuint getName() const;
    backend::Texture* getBackendTexture() const;
    
    /** Gets max S. */
    GLfloat getMaxS() const;
    /** Sets max S. */
    void setMaxS(GLfloat maxS);
    
    /** Gets max T. */
    GLfloat getMaxT() const;
    /** Sets max T. */
    void setMaxT(GLfloat maxT);
    
    /** Get the texture content size.*/
    Size getContentSize() const;

    std::string getPath()const { return _filePath; }

    void setAlphaTexture(Texture2D* alphaTexture);
    Texture2D* getAlphaTexture() const;

    bool getAlphaTextureName() const;
public:
    /** Get pixel info map, the key-value pairs is PixelFormat and PixelFormatInfo.*/
    static const PixelFormatInfoMap& getPixelFormatInfoMap();
    
private:
    /**
    * A struct for storing 9-patch image capInsets.
    */

    class NinePatchInfo
    {
    public:
        Rect capInsetSize;
        std::unordered_map<SpriteFrame*, Rect> capInsetMap;
    };

    /**
     * Whether the texture contains a 9-patch capInset info or not.
     *
     * @return True is Texture contains a 9-patch info, false otherwise.
     */
    bool isContain9PatchInfo()const;

    /**
     * Get spriteFrame capInset, If spriteFrame can't be found in 9-patch info map,
     * then single 9-patch texture capInset will be returned.
     * If the arg is nullptr, the capInset of single 9-patch texture will be returned.
     *
     * @param spriteFrame A SpriteFrame object pointer.
     *
     * @return The capInset of the SpriteFrame object.
     */
    const Rect& getSpriteFrameCapInset(SpriteFrame* spriteFrame)const;
    /**
     * Remove the spriteFrame capInset info when the spriteFrame is removed.
     *
     * @param spriteFrame A SpriteFrame object pointer.
     */
    void removeSpriteFrameCapInset(SpriteFrame* spriteFrame);
    /**
     * Add capInset for sprite atlas.
     * When handling single texture, pass nullptr in the first arg.
     *
     * @param spritframe The sprite frame object.
     * @param capInsets The parsed capInset from a .9 patch image.
     */
    void addSpriteFrameCapInset(SpriteFrame* spritframe, const Rect& capInsets);



    
protected:
    /** pixel format of the texture */
    Texture2D::PixelFormat _pixelFormat;

    /** width in pixels */
    int _pixelsWide;

    /** height in pixels */
    int _pixelsHigh;

    /** texture name */
    backend::Texture* _texture;
    

    /** texture max S */
    GLfloat _maxS;
    
    /** texture max T */
    GLfloat _maxT;

    /** content size */
    Size _contentSize;

    /** whether or not the texture has their Alpha premultiplied */
    bool _hasPremultipliedAlpha;
    
    /** whether or not the texture has mip maps*/
    bool _hasMipmaps;

    static const PixelFormatInfoMap _pixelFormatInfoTables;

    bool _antialiasEnabled;
    NinePatchInfo* _ninePatchInfo;
    friend class SpriteFrameCache;
    friend class TextureCache;
    friend class ui::Scale9Sprite;

    bool _valid;
    std::string _filePath;

    Texture2D* _alphaTexture;
};


// end of textures group
/// @}

NS_CC_END

#endif //__CCTEXTURE2D_H__