Class: Magick::Pixel

Inherits:
Object
  • Object
show all
Includes:
Comparable, Observable
Defined in:
lib/rmagick_internal.rb,
ext/RMagick/rmmain.c

Overview

Magick::ImageList

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(red = 0, green = 0, blue = 0, opacity = 0) ⇒ Magick::Pixel

Initialize Pixel object.

Returns self.

Parameters:

  • red (Numeric) (defaults to: 0) —

    The red value

  • green (Numeric) (defaults to: 0) —

    The green value

  • blue (Numeric) (defaults to: 0) —

    The blue value

  • opacity (Numeric) (defaults to: 0) —

    The opacity value



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# File 'ext/RMagick/rmpixel.c', line 938

VALUE
Pixel_initialize(int argc, VALUE *argv, VALUE self)
{
    Pixel *pixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);

#if defined(IMAGEMAGICK_7)
    pixel->alpha = OpaqueAlpha;
#endif

    switch(argc)
    {
        case 4:
#if defined(IMAGEMAGICK_7)
            if (argv[3] != Qnil)
            {
                pixel->alpha = APP2QUANTUM(argv[3]);
            }
#else
            if (argv[3] != Qnil)
            {
                pixel->opacity = APP2QUANTUM(argv[3]);
            }
#endif
        case 3:
            if (argv[2] != Qnil)
            {
                pixel->blue = APP2QUANTUM(argv[2]);
            }
        case 2:
            if (argv[1] != Qnil)
            {
                pixel->green = APP2QUANTUM(argv[1]);
            }
        case 1:
            if (argv[0] != Qnil)
            {
                pixel->red = APP2QUANTUM(argv[0]);
            }
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
    }

    return self;
}

Class Method Details

.from_color(name) ⇒ Magick::Pixel

Construct an Magick::Pixel corresponding to the given color name.

  • The “inverse” is Image#to_color, b/c the conversion of a pixel to a color name requires both a color depth and if the opacity value has meaning.

Parameters:

  • name (String) —

    the color name

Returns:

See Also:



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# File 'ext/RMagick/rmpixel.c', line 681

VALUE
Pixel_from_color(VALUE class ATTRIBUTE_UNUSED, VALUE name)
{
    PixelColor pp;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    exception = AcquireExceptionInfo();
    okay = QueryColorCompliance(StringValueCStr(name), AllCompliance, &pp, exception);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    if (!okay)
    {
        rb_raise(rb_eArgError, "invalid color name: %s", StringValueCStr(name));
    }

    return Pixel_from_PixelColor(&pp);
}

.from_hsla(hue, saturation, lightness, alpha = 1.0) ⇒ Magick::Pixel

Construct an RGB pixel.

  • 0 <= hue < 360 OR “0%” <= hue < “100%”

  • 0 <= saturation <= 255 OR “0%” <= saturation <= “100%”

  • 0 <= lightness <= 255 OR “0%” <= lightness <= “100%”

  • 0 <= alpha <= 1 (0 is transparent, 1 is opaque) OR “0%” <= alpha <= “100%”

Returns a new Magick::Pixel object.

Parameters:

  • hue (Numeric, String) —

    A value in the range.

  • saturation (Numeric, String) —

    A value in the range.

  • lightness (Numeric, String) —

    A value in the range.

  • alpha (Numeric) (defaults to: 1.0) —

    The alpha value.

Returns:



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# File 'ext/RMagick/rmpixel.c', line 717

VALUE
Pixel_from_hsla(int argc, VALUE *argv, VALUE class ATTRIBUTE_UNUSED)
{
    double h, s, l, a = 1.0;
    MagickPixel pp;
    ExceptionInfo *exception;
    char name[50];
    MagickBooleanType alpha = MagickFalse;

    switch (argc)
    {
        case 4:
            a = rm_percentage(argv[3], 1.0);
            alpha = MagickTrue;
        case 3:
            // saturation and lightness are out of 255 in new ImageMagicks and
            // out of 100 in old ImageMagicks. Compromise: always use %.
            l = rm_percentage(argv[2], 255.0);
            s = rm_percentage(argv[1], 255.0);
            h = rm_percentage(argv[0], 360.0);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 3 or 4)", argc);
            break;
    }

    if (alpha && (a < 0.0 || a > 1.0))
    {
        rb_raise(rb_eRangeError, "alpha %g out of range [0.0, 1.0]", a);
    }
    if (l < 0.0 || l > 255.0)
    {
        rb_raise(rb_eRangeError, "lightness %g out of range [0.0, 255.0]", l);
    }
    if (s < 0.0 || s > 255.0)
    {
        rb_raise(rb_eRangeError, "saturation %g out of range [0.0, 255.0]", s);
    }
    if (h < 0.0 || h >= 360.0)
    {
        rb_raise(rb_eRangeError, "hue %g out of range [0.0, 360.0)", h);
    }

    memset(name, 0, sizeof(name));
    if (alpha)
    {
        snprintf(name, sizeof(name), "hsla(%-2.1f,%-2.1f,%-2.1f,%-2.1f)", h, s, l, a);
    }
    else
    {
        snprintf(name, sizeof(name), "hsl(%-2.1f,%-2.1f,%-2.1f)", h, s, l);
    }

    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    QueryColorCompliance(name, AllCompliance, &pp, exception);
#else
    QueryMagickColor(name, &pp, exception);
#endif
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return Pixel_from_MagickPixel(&pp);
}

Instance Method Details

#<=>(other) ⇒ -1, ...

Support Comparable mixin.

Parameters:

  • other (Object) —

    the other Pixel

Returns:

  • (-1, 0, 1, nil) —

    the result of compare



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# File 'ext/RMagick/rmpixel.c', line 1067

VALUE
Pixel_spaceship(VALUE self, VALUE other)
{
    Pixel *this, *that;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, this);
    TypedData_Get_Struct(other, Pixel, &rm_pixel_data_type, that);

    if (this->red != that->red)
    {
        return INT2NUM((this->red - that->red)/abs((int)(this->red - that->red)));
    }
    else if(this->green != that->green)
    {
        return INT2NUM((this->green - that->green)/abs((int)(this->green - that->green)));
    }
    else if(this->blue != that->blue)
    {
        return INT2NUM((this->blue - that->blue)/abs((int)(this->blue - that->blue)));
    }
#if defined(IMAGEMAGICK_7)
    else if(this->alpha != that->alpha)
    {
        return INT2NUM((this->alpha - that->alpha)/abs((int)(this->alpha - that->alpha)));
    }
#else
    else if(this->opacity != that->opacity)
    {
        return INT2NUM(((QuantumRange - this->opacity) - (QuantumRange - that->opacity))/abs((int)((QuantumRange - this->opacity) - (QuantumRange - that->opacity))));
    }
#endif

    // Values are equal, check class.

    return rb_funcall(CLASS_OF(self), rb_intern("<=>"), 1, CLASS_OF(other));

}

#===(other) ⇒ Boolean

“Case equal” operator for Pixel.

Parameters:

  • other (Object) —

    the other object

Returns:

  • (Boolean) —

    true or false



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# File 'ext/RMagick/rmpixel.c', line 512

VALUE
Pixel_case_eq(VALUE self, VALUE other)
{
    if (CLASS_OF(self) == CLASS_OF(other))
    {
        Pixel *this, *that;

        TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, this);
        TypedData_Get_Struct(other, Pixel, &rm_pixel_data_type, that);
        return (this->red == that->red
            && this->blue == that->blue
            && this->green == that->green
#if defined(IMAGEMAGICK_7)
            && this->alpha == that->alpha) ? Qtrue : Qfalse;
#else
            && this->opacity == that->opacity) ? Qtrue : Qfalse;
#endif
    }

    return Qfalse;
}

#alpha ⇒ Numeric

Get Pixel alpha value.

Returns:

  • (Numeric) —

    the alpha value



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# File 'ext/RMagick/rmpixel.c', line 100

VALUE
Pixel_alpha(VALUE self)
{
    Pixel *pixel;
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
#if defined(IMAGEMAGICK_7)
    return C_int_to_R_int(pixel->alpha);
#else
    return C_int_to_R_int(QuantumRange - pixel->opacity);
#endif
}

#alpha=(v) ⇒ Numeric

Set Pixel alpha value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the alpha value

Returns:

  • (Numeric) —

    the given alpha value



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# File 'ext/RMagick/rmpixel.c', line 195

VALUE
Pixel_alpha_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
#if defined(IMAGEMAGICK_7)
    pixel->alpha = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM(pixel->alpha);
#else
    pixel->opacity = QuantumRange - APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM(QuantumRange - pixel->opacity);
#endif
}

#black ⇒ Numeric

Get Pixel black value.

Returns:

  • (Numeric) —

    the black value



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# File 'ext/RMagick/rmpixel.c', line 334

VALUE
Pixel_black(VALUE self)
{
    Pixel *pixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    return INT2NUM(pixel->black);
}

#black=(v) ⇒ Numeric

Set Pixel black value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the black value

Returns:

  • (Numeric) —

    the given black value



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# File 'ext/RMagick/rmpixel.c', line 354

VALUE
Pixel_black_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->black = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM(pixel->black);
}

#blue ⇒ Numeric

Get Pixel blue value.

Returns:

  • (Numeric) —

    the blue value



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# File 'ext/RMagick/rmpixel.c', line 89

VALUE
Pixel_blue(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Pixel, blue, int, &rm_pixel_data_type);
}

#blue=(v) ⇒ Numeric

Set Pixel blue value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the blue value

Returns:

  • (Numeric) —

    the given blue value



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# File 'ext/RMagick/rmpixel.c', line 171

VALUE
Pixel_blue_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->blue = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM((pixel->blue));
}

#clone ⇒ Magick::Pixel

Clone a Pixel.

Returns:

See Also:



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# File 'ext/RMagick/rmpixel.c', line 542

VALUE
Pixel_clone(VALUE self)
{
    VALUE clone;

    clone = Pixel_dup(self);
    if (OBJ_FROZEN(self))
    {
        OBJ_FREEZE(clone);
    }

    RB_GC_GUARD(clone);

    return clone;
}

#cyan ⇒ Numeric

Get Pixel cyan value.

Returns:

  • (Numeric) —

    the cyan value



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# File 'ext/RMagick/rmpixel.c', line 220

VALUE
Pixel_cyan(VALUE self)
{
    Pixel *pixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    return INT2NUM(pixel->red);
}

#cyan=(v) ⇒ Numeric

Set Pixel cyan value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the cyan value

Returns:

  • (Numeric) —

    the given cyan value



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# File 'ext/RMagick/rmpixel.c', line 240

VALUE
Pixel_cyan_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->red = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM(pixel->red);
}

#dup ⇒ Magick::Pixel

Duplicate a Pixel.

Returns:

See Also:



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# File 'ext/RMagick/rmpixel.c', line 566

VALUE
Pixel_dup(VALUE self)
{
    Pixel *pixel;
    VALUE dup;

    pixel = ALLOC(Pixel);
    memset(pixel, '\0', sizeof(Pixel));
    dup = TypedData_Wrap_Struct(CLASS_OF(self), &rm_pixel_data_type, pixel);
    RB_GC_GUARD(dup);

    return rb_funcall(dup, rm_ID_initialize_copy, 1, self);
}

#eql?(other) ⇒ Boolean

Equality. Returns true only if receiver and other are the same object.

Parameters:

  • other (Object) —

    the other object

Returns:

  • (Boolean) —

    true if other is the same value, otherwise false



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# File 'ext/RMagick/rmpixel.c', line 587

VALUE
Pixel_eql_q(VALUE self, VALUE other)
{
    return NUM2INT(Pixel_spaceship(self, other)) == 0 ? Qtrue : Qfalse;
}

#fcmp(other, fuzz = 0.0, colorspace = Magick::RGBColorspace) ⇒ Boolean

Compare pixel values for equality.

Returns true if equal, otherwise false.

Parameters:

  • other (Magick::Pixel) —

    The pixel to which the receiver is compared

  • fuzz (Float) (defaults to: 0.0) —

    The amount of fuzz to allow before the colors are considered to be different

  • colorspace (Magick::ColorspaceType) (defaults to: Magick::RGBColorspace) —

    The colorspace

Returns:

  • (Boolean) —

    true if equal, otherwise false



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# File 'ext/RMagick/rmpixel.c', line 603

VALUE
Pixel_fcmp(int argc, VALUE *argv, VALUE self)
{
    double fuzz = 0.0;
    unsigned int equal;
    ColorspaceType colorspace = RGBColorspace;
    PixelColor this, that;
#if defined(IMAGEMAGICK_6)
    Image *image;
    Info *info;
#endif

    switch (argc)
    {
        case 3:
            VALUE_TO_ENUM(argv[2], colorspace, ColorspaceType);
        case 2:
            fuzz = NUM2DBL(argv[1]);
        case 1:
            // Allow 1 argument
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 3)", argc);
            break;
    }

    Color_to_PixelColor(&this, self);
    Color_to_PixelColor(&that, argv[0]);

#if defined(IMAGEMAGICK_7)
    this.fuzz = fuzz;
    this.colorspace = colorspace;
    that.fuzz = fuzz;
    that.colorspace = colorspace;
    equal = IsFuzzyEquivalencePixelInfo(&this, &that);
#else
    // The IsColorSimilar function expects to get the
    // colorspace and fuzz parameters from an Image structure.

    info = CloneImageInfo(NULL);
    if (!info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }

    image = rm_acquire_image(info);

    // Delete Info now in case we have to raise an exception
    DestroyImageInfo(info);

    if (!image)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }

    image->colorspace = colorspace;
    image->fuzz = fuzz;

    equal = IsColorSimilar(image, &this, &that);
    DestroyImage(image);
#endif

    return equal ? Qtrue : Qfalse;
}

#green ⇒ Numeric

Get Pixel green value.

Returns:

  • (Numeric) —

    the green value



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# File 'ext/RMagick/rmpixel.c', line 78

VALUE
Pixel_green(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Pixel, green, int, &rm_pixel_data_type);
}

#green=(v) ⇒ Numeric

Set Pixel green value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the green value

Returns:

  • (Numeric) —

    the given green value



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# File 'ext/RMagick/rmpixel.c', line 147

VALUE
Pixel_green_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->green = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM((pixel->green));
}

#hash ⇒ Numeric

Compute a hash-code.

Returns:

  • (Numeric) —

    the hash of self



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# File 'ext/RMagick/rmpixel.c', line 885

VALUE
Pixel_hash(VALUE self)
{
    Pixel *pixel;
    unsigned int hash;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);

    hash  = ScaleQuantumToChar(pixel->red)   << 24;
    hash += ScaleQuantumToChar(pixel->green) << 16;
    hash += ScaleQuantumToChar(pixel->blue)  << 8;
#if defined(IMAGEMAGICK_7)
    hash += ScaleQuantumToChar(pixel->alpha);
#else
    hash += ScaleQuantumToChar(QuantumRange - pixel->opacity);
#endif

    return UINT2NUM(hash >> 1);
}

#initialize_copy(orig) ⇒ Magick::Pixel

Initialize clone, dup methods.

Parameters:

Returns:

See Also:



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# File 'ext/RMagick/rmpixel.c', line 914

VALUE
Pixel_init_copy(VALUE self, VALUE orig)
{
    Pixel *copy, *original;

    TypedData_Get_Struct(orig, Pixel, &rm_pixel_data_type, original);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, copy);

    *copy = *original;

    return self;
}

#intensity ⇒ Numeric

Return the “intensity” of a pixel.

Returns:

  • (Numeric) —

    the intensity



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# File 'ext/RMagick/rmpixel.c', line 993

VALUE
Pixel_intensity(VALUE self)
{
    Pixel *pixel;
    Quantum intensity;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);

    intensity = ROUND_TO_QUANTUM((0.299*pixel->red)
                                + (0.587*pixel->green)
                                + (0.114*pixel->blue));

    return QUANTUM2NUM((unsigned long) intensity);
}

#magenta ⇒ Numeric

Get Pixel magenta value.

Returns:

  • (Numeric) —

    the magenta value



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# File 'ext/RMagick/rmpixel.c', line 258

VALUE
Pixel_magenta(VALUE self)
{
    Pixel *pixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    return INT2NUM(pixel->green);
}

#magenta=(v) ⇒ Numeric

Set Pixel magenta value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the magenta value

Returns:

  • (Numeric) —

    the given magenta value



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# File 'ext/RMagick/rmpixel.c', line 278

VALUE
Pixel_magenta_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->green = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM(pixel->green);
}

#marshal_dump ⇒ Hash

Support Marshal.dump.

Returns:

  • (Hash) —

    a representing the dumped pixel



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# File 'ext/RMagick/rmpixel.c', line 1014

VALUE
Pixel_marshal_dump(VALUE self)
{
    Pixel *pixel;
    VALUE dpixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    dpixel = rb_hash_new();
    rb_hash_aset(dpixel, CSTR2SYM("red"), QUANTUM2NUM(pixel->red));
    rb_hash_aset(dpixel, CSTR2SYM("green"), QUANTUM2NUM(pixel->green));
    rb_hash_aset(dpixel, CSTR2SYM("blue"), QUANTUM2NUM(pixel->blue));
#if defined(IMAGEMAGICK_7)
    rb_hash_aset(dpixel, CSTR2SYM("alpha"), QUANTUM2NUM(pixel->alpha));
#else
    rb_hash_aset(dpixel, CSTR2SYM("opacity"), QUANTUM2NUM(pixel->opacity));
#endif

    RB_GC_GUARD(dpixel);

    return dpixel;
}

#marshal_load(dpixel) ⇒ Object

Support Marshal.load.

Parameters:

  • dpixel (Hash) —

    the dumped pixel

Returns:

  • self



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# File 'ext/RMagick/rmpixel.c', line 1043

VALUE
Pixel_marshal_load(VALUE self, VALUE dpixel)
{
    Pixel *pixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->red = NUM2QUANTUM(rb_hash_aref(dpixel, CSTR2SYM("red")));
    pixel->green = NUM2QUANTUM(rb_hash_aref(dpixel, CSTR2SYM("green")));
    pixel->blue = NUM2QUANTUM(rb_hash_aref(dpixel, CSTR2SYM("blue")));
#if defined(IMAGEMAGICK_7)
    pixel->alpha = NUM2QUANTUM(rb_hash_aref(dpixel, CSTR2SYM("alpha")));
#else
    pixel->opacity = NUM2QUANTUM(rb_hash_aref(dpixel, CSTR2SYM("opacity")));
#endif
    return self;
}

#red ⇒ Numeric

Get Pixel red value.

Returns:

  • (Numeric) —

    the red value



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# File 'ext/RMagick/rmpixel.c', line 67

VALUE
Pixel_red(VALUE self)
{
    IMPLEMENT_TYPED_ATTR_READER(Pixel, red, int, &rm_pixel_data_type);
}

#red=(v) ⇒ Numeric

Set Pixel red value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the red value

Returns:

  • (Numeric) —

    the given red value



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# File 'ext/RMagick/rmpixel.c', line 123

VALUE
Pixel_red_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->red = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM((pixel->red));
}

#to_color(compliance = Magick::AllCompliance, alpha = false, depth = Magick::MAGICKCORE_QUANTUM_DEPTH, hex = false) ⇒ String

Return the color name corresponding to the pixel values.

Returns the color name as a String.

Parameters:

  • compliance (Magick::ComplianceType) (defaults to: Magick::AllCompliance) —

    A ComplianceType constant

  • alpha (Boolean) (defaults to: false) —

    If false, the pixel’s alpha attribute is ignored

  • depth (Numeric) (defaults to: Magick::MAGICKCORE_QUANTUM_DEPTH) —

    An image depth

  • hex (Boolean) (defaults to: false) —

    If true, represent the color name in hex format

Returns:

  • (String) —

    the color name as a String



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# File 'ext/RMagick/rmpixel.c', line 1199

VALUE
Pixel_to_color(int argc, VALUE *argv, VALUE self)
{
    Info *info;
    Image *image;
    Pixel *pixel;
    MagickPixel mpp;
    MagickBooleanType hex = MagickFalse;
    char name[MaxTextExtent];
    ExceptionInfo *exception;
    ComplianceType compliance = AllCompliance;
    unsigned int alpha = MagickFalse;
    unsigned int depth = MAGICKCORE_QUANTUM_DEPTH;

    switch (argc)
    {
        case 4:
            hex = RTEST(argv[3]);
        case 3:
            depth = NUM2UINT(argv[2]);

            // Ensure depth is appropriate for the way xMagick was compiled.
            switch (depth)
            {
                case 8:
#if MAGICKCORE_QUANTUM_DEPTH == 16 || MAGICKCORE_QUANTUM_DEPTH == 32
                case 16:
#endif
#if MAGICKCORE_QUANTUM_DEPTH == 32
                case 32:
#endif
                    break;
                default:
                    rb_raise(rb_eArgError, "invalid depth (%d)", depth);
                    break;
            }
       case 2:
            alpha = RTEST(argv[1]);
        case 1:
            VALUE_TO_ENUM(argv[0], compliance, ComplianceType);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
    }

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);

    info = CloneImageInfo(NULL);
    image = rm_acquire_image(info);
    DestroyImageInfo(info);

    if (!image)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue.");
    }

    exception = AcquireExceptionInfo();

    image->depth = depth;
#if defined(IMAGEMAGICK_7)
    if (alpha)
    {
        image->alpha_trait = BlendPixelTrait;
    }
#else
    image->matte = alpha;
#endif

    rm_init_magickpixel(image, &mpp);
    rm_set_magick_pixel_packet(pixel, &mpp);

    // Support for hex-format color names moved out of QueryMagickColorname
    // in 6.4.1-9. The 'hex' argument was removed as well.
    if (hex)
    {
        if (compliance == XPMCompliance)
        {
#if defined(IMAGEMAGICK_7)
            mpp.alpha_trait = UndefinedPixelTrait;
#else
            mpp.matte = MagickFalse;
#endif
            mpp.depth = (unsigned long) min(1.0 * image->depth, 16.0);
        }
        GetColorTuple(&mpp, MagickTrue, name);
    }
    else
    {
        QueryColorname(image, &mpp, compliance, name, exception);
    }

    DestroyImage(image);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    // Always return a string, even if it's ""
    return rb_str_new2(name);
}

#to_hsla ⇒ Array<Float>

Return [hue, saturation, lightness, alpha] in the same ranges as from_hsla.

Returns:

  • (Array<Float>) —

    an array with hsla data

See Also:



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# File 'ext/RMagick/rmpixel.c', line 1113

VALUE
Pixel_to_hsla(VALUE self)
{
    double hue, sat, lum, alpha;
    Pixel *pixel;
    VALUE hsla;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);

    ConvertRGBToHSL(pixel->red, pixel->green, pixel->blue, &hue, &sat, &lum);
    hue *= 360.0;
    sat *= 255.0;
    lum *= 255.0;

#if defined(IMAGEMAGICK_7)
    if (pixel->alpha == OpaqueAlpha)
    {
        alpha = 1.0;
    }
    else if (pixel->alpha == TransparentAlpha)
    {
        alpha = 0.0;
    }
    else
    {
        alpha = (double)(pixel->alpha) / (double)QuantumRange;
    }
#else
    if (pixel->opacity == OpaqueOpacity)
    {
        alpha = 1.0;
    }
    else if (pixel->opacity == TransparentOpacity)
    {
        alpha = 0.0;
    }
    else
    {
        alpha = (double)(QuantumRange - pixel->opacity) / (double)QuantumRange;
    }
#endif

    hsla = rb_ary_new3(4, rb_float_new(hue), rb_float_new(sat), rb_float_new(lum), rb_float_new(alpha));

    RB_GC_GUARD(hsla);

    return hsla;
}

#to_s ⇒ String

Return a string representation of a Magick::Pixel object.

Returns:

  • (String) —

    the string



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# File 'ext/RMagick/rmpixel.c', line 1305

VALUE
Pixel_to_s(VALUE self)
{
    Pixel *pixel;
    char buff[100];

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    snprintf(buff, sizeof(buff), "red=" QuantumFormat ", green=" QuantumFormat ", blue=" QuantumFormat ", alpha=" QuantumFormat,
            pixel->red, pixel->green, pixel->blue,
#if defined(IMAGEMAGICK_7)
            pixel->alpha);
#else
            (QuantumRange - pixel->opacity));
#endif
    return rb_str_new2(buff);
}

#yellow ⇒ Numeric

Get Pixel yellow value.

Returns:

  • (Numeric) —

    the yellow value



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# File 'ext/RMagick/rmpixel.c', line 296

VALUE
Pixel_yellow(VALUE self)
{
    Pixel *pixel;

    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    return INT2NUM(pixel->blue);
}

#yellow=(v) ⇒ Numeric

Set Pixel yellow value.

  • Pixel is Observable. Setters call #changed, #notify_observers

  • Setters return their argument values for backward compatibility to when Pixel was a Struct class.

Parameters:

  • v (Numeric) —

    the yellow value

Returns:

  • (Numeric) —

    the given yellow value



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# File 'ext/RMagick/rmpixel.c', line 316

VALUE
Pixel_yellow_eq(VALUE self, VALUE v)
{
    Pixel *pixel;

    rb_check_frozen(self);
    TypedData_Get_Struct(self, Pixel, &rm_pixel_data_type, pixel);
    pixel->blue = APP2QUANTUM(v);
    rb_funcall(self, rm_ID_changed, 0);
    rb_funcall(self, rm_ID_notify_observers, 1, self);
    return QUANTUM2NUM(pixel->blue);
}