Class: Magick::Pixel

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
ext/RMagick/rmmain.c

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object

Ruby usage:

- @verbatim Pixel#initialize @endverbatim
- @verbatim Pixel#initialize(red) @endverbatim
- @verbatim Pixel#initialize(red,green) @endverbatim
- @verbatim Pixel#initialize(red,green,blue) @endverbatim
- @verbatim Pixel#initialize(red,green,blue,opacity) @endverbatim

Notes:

- Default red is 0.0
- Default green is 0.0
- Default blue is 0.0
- Default opacity is 0.0
- For backward compatibility, arguments may be nil.

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object



725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
 
# File 'ext/RMagick/rmpixel.c', line 725

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

    Data_Get_Struct(self, Pixel, pixel);

    switch(argc)
    {
        case 4:
            if (argv[3] != Qnil)
            {
                pixel->opacity = APP2QUANTUM(argv[3]);
            }
        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) ⇒ Object

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

Ruby usage:

- @verbatim Magick::Pixel.from_color(string) @endverbatim

Notes:

- 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 (i.e. whether image->matte == True or not).

Parameters:

  • class —

    the Ruby class to use

  • name —

    the color name

Returns:

  • a new Magic::Pixel object

See Also:

  • Image_to_color
  • Pixel_to_color


448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
 
# File 'ext/RMagick/rmpixel.c', line 448

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

    class = class;      // defeat "never referenced" message from icc

    exception = AcquireExceptionInfo();
    okay = QueryColorDatabase(StringValuePtr(name), &pp, exception);
    CHECK_EXCEPTION()
    (void) DestroyExceptionInfo(exception);

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

    return Pixel_from_PixelPacket(&pp);
}

.from_HSL(hsl) ⇒ Object

Deprecated.

This method has been deprecated. Please use Pixel_from_hsla.

Construct an RGB pixel from the array [hue, saturation, luminosity].

Ruby usage:

- @verbatim Pixel.from_HSL  @endverbatim

Parameters:

  • class —

    the Ruby class to use

  • hsl —

    the array

Returns:

  • a new Magick::Pixel object



577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
 
# File 'ext/RMagick/rmpixel.c', line 577

VALUE
Pixel_from_HSL(VALUE class, VALUE hsl)
{
    PixelPacket rgb;
    double hue, saturation, luminosity;

    class = class;      // defeat "never referenced" message from icc
    memset(&rgb, 0, sizeof(rgb));

    hsl = rb_Array(hsl);    // Ensure array
    if (RARRAY_LEN(hsl) < 3)
    {
        rb_raise(rb_eArgError, "array argument must have at least 3 elements");
    }

    hue        = NUM2DBL(rb_ary_entry(hsl, 0));
    saturation = NUM2DBL(rb_ary_entry(hsl, 1));
    luminosity = NUM2DBL(rb_ary_entry(hsl, 2));

    rb_warning("Pixel#from_HSL is deprecated; use from_hsla");
    ConvertHSLToRGB(hue, saturation, luminosity,
                 &rgb.red, &rgb.green, &rgb.blue);
    return Pixel_from_PixelPacket(&rgb);
}

.from_hsla(*args) ⇒ Object

Construct an RGB pixel.

Ruby usage:

- @verbatim Pixel#from_hsla(hue, saturation, lightness) @endverbatim
- @verbatim Pixel#from_hsla(hue, saturation, lightness, alpha) @endverbatim

Notes:

- Default alpha is 1.0
- 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%"
- Replaces brain-dead Pixel_from_HSL.

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • class —

    the Ruby class to use

Returns:

  • a new Magick::Pixel object



491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
 
# File 'ext/RMagick/rmpixel.c', line 491

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

    class = class;          // defeat "unused parameter" message.

    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);
    }

    // Ugly way of checking for change in ImageMagick 6.5.6-5 to see whether
    // saturation/lightness should be out of 255 or out of 100.
    if(MagickLibVersion < 0x656 ||
        (MagickLibVersion == 0x656 && strcmp(MagickLibSubversion,"-5") <= 0) )
    {
      s = s/2.55;
      l = l/2.55;
    }

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

    exception = AcquireExceptionInfo();

    (void) QueryMagickColor(name, &pp, exception);
    CHECK_EXCEPTION()

    (void) DestroyExceptionInfo(exception);

    return Pixel_from_MagickPixelPacket(&pp);
}

Instance Method Details

#<=>(other) ⇒ Object

Support Comparable mixin.

Ruby usage:

- @verbatim Pixel#<=> @endverbatim

Parameters:

  • self —

    this object

  • other —

    the other Pixel

Returns:

  • -1, 0, 1



851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
 
# File 'ext/RMagick/rmpixel.c', line 851

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

    Data_Get_Struct(self, Pixel, this);
    Data_Get_Struct(other, Pixel, that);

    if (this->red != that->red)
    {
        return INT2NUM((this->red - that->red)/abs(this->red - that->red));
    }
    else if(this->green != that->green)
    {
        return INT2NUM((this->green - that->green)/abs(this->green - that->green));
    }
    else if(this->blue != that->blue)
    {
        return INT2NUM((this->blue - that->blue)/abs(this->blue - that->blue));
    }
    else if(this->opacity != that->opacity)
    {
        return INT2NUM((this->opacity - that->opacity)/abs(this->opacity - that->opacity));
    }

    // Values are equal, check class.

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

}

#===(other) ⇒ Object

“Case equal” operator for Pixel.

Ruby usage:

- @verbatim Pixel#=== @endverbatim

Parameters:

  • self —

    this object

  • other —

    the other object

Returns:

  • true or false



264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
 
# File 'ext/RMagick/rmpixel.c', line 264

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

    if (CLASS_OF(self) == CLASS_OF(other))
    {
        Data_Get_Struct(self, Pixel, this);
        Data_Get_Struct(other, Pixel, that);
        return (this->red == that->red
            && this->blue == that->blue
            && this->green == that->green
            && this->opacity == that->opacity) ? Qtrue : Qfalse;
    }

    return Qfalse;
}

#clone ⇒ Object

Clone a Pixel.

Ruby usage:

- @verbatim Pixel#clone @endverbatim

Parameters:

  • self —

    this object

Returns:

  • a clone

See Also:

  • Pixel_dup
  • Pixel_init_copy


294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
 
# File 'ext/RMagick/rmpixel.c', line 294

VALUE
Pixel_clone(VALUE self)
{
    VALUE clone;

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

    RB_GC_GUARD(clone);

    return clone;
}

#dup ⇒ Object

Duplicate a Pixel.

Ruby usage:

- @verbatim Pixel#dup @endverbatim

Parameters:

  • self —

    this object

Returns:

  • a clone

See Also:

  • Pixel_clone
  • Pixel_init_copy


322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
 
# File 'ext/RMagick/rmpixel.c', line 322

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

    pixel = ALLOC(Pixel);
    memset(pixel, '\0', sizeof(Pixel));
    dup = Data_Wrap_Struct(CLASS_OF(self), NULL, destroy_Pixel, pixel);
    if (rb_obj_tainted(self))
    {
        (void) rb_obj_taint(dup);
    }

    RB_GC_GUARD(dup);

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

#eql?(other) ⇒ Boolean

For use with Hash.

Ruby usage:

- @verbatim Pixel#eql? @endverbatim

Parameters:

  • self —

    this object

  • other —

    the other object

Returns:

  • (Boolean) —

    true if hash to the same value, otherwise false



352
353
354
355
356
 
# File 'ext/RMagick/rmpixel.c', line 352

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

#fcmp(*args) ⇒ Object

Compare pixel values for equality.

Ruby usage:

- @verbatim Pixel#fcmp(other, fuzz, colorspace) @endverbatim

Notes:

- Default fuzz is 0.0
- Default colorspace is RGBColorspace

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • true if equal, otherwise false



374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
 
# File 'ext/RMagick/rmpixel.c', line 374

VALUE
Pixel_fcmp(int argc, VALUE *argv, VALUE self)
{
    Image *image;
    Info *info;

    Pixel *this, *that;
    ColorspaceType colorspace = RGBColorspace;
    double fuzz = 0.0;
    unsigned int equal;

    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;
    }

    Data_Get_Struct(self, Pixel, this);
    Data_Get_Struct(argv[0], Pixel, that);

    // 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 = AcquireImage(info);

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

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

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

    equal = IsColorSimilar(image, this, that);
    (void) DestroyImage(image);

    return equal ? Qtrue : Qfalse;
}

#hash ⇒ Object

Ruby usage:

- @verbatim Pixel#hash @endverbatim

Notes:

- INT2FIX left-shifts 1 bit. Sacrifice 1 bit from the opacity attribute to
  the FIXNUM_FLAG.

Parameters:

  • self —

    this object

Returns:

  • the hash of self



662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
 
# File 'ext/RMagick/rmpixel.c', line 662

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

    Data_Get_Struct(self, Pixel, pixel);

    hash  = ScaleQuantumToChar(pixel->red)   << 24;
    hash += ScaleQuantumToChar(pixel->green) << 16;
    hash += ScaleQuantumToChar(pixel->blue)  << 8;
    hash += ScaleQuantumToChar(pixel->opacity);

    return UINT2NUM(hash >> 1);
}

#initialize_copy(orig) ⇒ Object

Initialize clone, dup methods.

Ruby usage:

- @verbatim Pixel#initialize_copy @endverbatim

Parameters:

  • self —

    this object

  • orig —

    the original Pixel

Returns:

  • self

See Also:

  • Pixel_clone
  • Pixel_dup


691
692
693
694
695
696
697
698
699
700
701
702
 
# File 'ext/RMagick/rmpixel.c', line 691

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

    Data_Get_Struct(orig, Pixel, original);
    Data_Get_Struct(self, Pixel, copy);

    *copy = *original;

    return self;
}

#intensity ⇒ Object

Return the “intensity” of a pixel.

Ruby usage:

- @verbatim Pixel#intensity @endverbatim

Parameters:

  • self —

    this object

Returns:

  • the intensity



773
774
775
776
777
778
779
780
781
782
783
784
785
786
 
# File 'ext/RMagick/rmpixel.c', line 773

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

    Data_Get_Struct(self, Pixel, pixel);

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

    return QUANTUM2NUM((unsigned long) intensity);
}

#marshal_dump ⇒ Object

Support Marshal.dump.

Ruby usage:

- @verbatim Pixel#marshal_dump @endverbatim

Parameters:

  • self —

    this object

Returns:

  • a string representing the dumped pixel



798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
 
# File 'ext/RMagick/rmpixel.c', line 798

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

    Data_Get_Struct(self, Pixel, 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));
    rb_hash_aset(dpixel, CSTR2SYM("opacity"), QUANTUM2NUM(pixel->opacity));

    RB_GC_GUARD(dpixel);

    return dpixel;
}

#marshal_load(dpixel) ⇒ Object

Support Marshal.load.

Ruby usage:

- @verbatim Pixel#marshal_load @endverbatim

Parameters:

  • self —

    this object

  • dpixel —

    the dumped pixel

Returns:

  • self



827
828
829
830
831
832
833
834
835
836
837
838
 
# File 'ext/RMagick/rmpixel.c', line 827

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

    Data_Get_Struct(self, Pixel, 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")));
    pixel->opacity = NUM2QUANTUM(rb_hash_aref(dpixel, CSTR2SYM("opacity")));
    return self;
}

#to_color(*args) ⇒ Object

Return the color name corresponding to the pixel values.

Ruby usage:

- @verbatim Magick::Pixel#to_color @endverbatim
- @verbatim Magick::Pixel#to_color(compliance) @endverbatim
- @verbatim Magick::Pixel#to_color(compliance, matte) @endverbatim
- @verbatim Magick::Pixel#to_color(compliance, matte, depth) @endverbatim
- @verbatim Magick::Pixel#to_color(compliance, matte, depth, hex) @endverbatim

Notes:

- Default compliance is AllCompliance
- Default matte is false
- Default depth is MAGICKCORE_QUANTUM_DEPTH
- Default hex is false
- The conversion respects the value of the 'opacity' field in the Pixel

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • the color name as a String



985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
 
# File 'ext/RMagick/rmpixel.c', line 985

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

    Data_Get_Struct(self, Pixel, pixel);

    info = CloneImageInfo(NULL);
    image = AcquireImage(info);
    image->depth = depth;
    image->matte = matte;
    (void) DestroyImageInfo(info);

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

    exception = AcquireExceptionInfo();

#if defined(HAVE_NEW_QUERYMAGICKCOLORNAME)
    // 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)
        {
            mpp.matte = MagickFalse;
            mpp.depth = (unsigned long) min(1.0 * image->depth, 16.0);
        }
        (void) GetColorTuple(&mpp, MagickTrue, name);
    }
    else
    {
        (void) QueryMagickColorname(image, &mpp, compliance, name, exception);
    }
#else
    (void) QueryMagickColorname(image, &mpp, compliance, hex, name, exception);
#endif
    (void) DestroyImage(image);
    CHECK_EXCEPTION()
    (void) DestroyExceptionInfo(exception);

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

#to_HSL ⇒ Object

Deprecated.

This method has been deprecated. Please use Pixel_to_hsla.

Convert an RGB pixel to the array [hue, saturation, luminosity].

Ruby usage:

- @verbatim Pixel#to_HSL @endverbatim

Parameters:

  • self —

    this object

Returns:

  • an array with hsl data



942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
 
# File 'ext/RMagick/rmpixel.c', line 942

VALUE
Pixel_to_HSL(VALUE self)
{
    Pixel *pixel;
    double hue, saturation, luminosity;
    VALUE hsl;

    Data_Get_Struct(self, Pixel, pixel);

    rb_warning("Pixel#to_HSL is deprecated; use to_hsla");
    ConvertRGBToHSL(pixel->red, pixel->green, pixel->blue, &hue, &saturation, &luminosity);

    hsl = rb_ary_new3(3, rb_float_new(hue), rb_float_new(saturation),
                      rb_float_new(luminosity));

    RB_GC_GUARD(hsl);

    return hsl;
}

#to_hsla ⇒ Object

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

Ruby usage:

- @verbatim Pixel#to_hsla @endverbatim

Notes:

- Replace brain-dead Pixel_to_HSL.

Parameters:

  • self —

    this object

Returns:

  • an array with hsla data

See Also:

  • Pixel_from_hsla


898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
 
# File 'ext/RMagick/rmpixel.c', line 898

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

    Data_Get_Struct(self, Pixel, pixel);

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

    if (pixel->opacity == OpaqueOpacity)
    {
        alpha = 1.0;
    }
    else if (pixel->opacity == TransparentOpacity)
    {
        alpha = 0.0;
    }
    else
    {
        alpha = (double)(QuantumRange - pixel->opacity) / (double)QuantumRange;
    }

    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 ⇒ Object

Create a string representation of a Magick::Pixel.

Ruby usage:

- @verbatim Magick::Pixel#to_s @endverbatim

Parameters:

  • self —

    this object

Returns:

  • the string



1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
 
# File 'ext/RMagick/rmpixel.c', line 1081

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

    Data_Get_Struct(self, Pixel, pixel);
    sprintf(buff, "red=" QuantumFormat ", green=" QuantumFormat ", blue=" QuantumFormat ", opacity=" QuantumFormat
          , pixel->red, pixel->green, pixel->blue, pixel->opacity);
    return rb_str_new2(buff);
}