Class: Caca::Dither

Inherits:
Object
  • Object
show all
Defined in:
ext/caca/caca-dither.c

Instance Method Summary collapse

Constructor Details

#initialize(bpp, w, h, pitch, rmask, gmask, bmask, amask) ⇒ Object 



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# File 'ext/caca/caca-dither.c', line 31

static VALUE dither_initialize(VALUE self, VALUE bpp, VALUE w, VALUE h, VALUE pitch, VALUE rmask, VALUE gmask, VALUE bmask, VALUE amask)
{
    caca_dither_t *dither;

    dither = caca_create_dither(NUM2UINT(bpp), NUM2UINT(w), NUM2UINT(h), NUM2UINT(pitch), NUM2ULONG(rmask), NUM2ULONG(gmask), NUM2ULONG(bmask), NUM2ULONG(amask));
    if(dither == NULL)
    {
        rb_raise(rb_eRuntimeError, "%s", strerror(errno));
    }
    _SELF = dither;
    return self;
}

Instance Method Details

#algorithm= ⇒ Object

#algorithm_list ⇒ Object

#antialias= ⇒ Object

#antialias_list ⇒ Object

#brightness= ⇒ Object

#charset= ⇒ Object

#charset_list ⇒ Object

#color= ⇒ Object

#color_list ⇒ Object

#contrast= ⇒ Object

#gamma= ⇒ Object

#palette=(palette) ⇒ Object 



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# File 'ext/caca/caca-dither.c', line 44

static VALUE set_dither_palette(VALUE self, VALUE palette)
{
    int i;
    unsigned int *red, *blue, *green, *alpha;
    VALUE v, r, g, b, a;
    int error = 0;

    if(RARRAY_LEN(palette) != 256)
    {
        rb_raise(rb_eArgError, "Palette must contain 256 elements");
    }

    red = ALLOC_N(unsigned int, 256);
    if(!red)
        rb_raise(rb_eNoMemError,"Out of memory");

    green = ALLOC_N(unsigned int, 256);
    if(!green)
    {
        free(red);
        rb_raise(rb_eNoMemError,"Out of memory");
    }

    blue = ALLOC_N(unsigned int, 256);
    if(!blue)
    {
        free(red);
        free(green);
        rb_raise(rb_eNoMemError,"Out of memory");
    }

    alpha = ALLOC_N(unsigned int, 256);
    if(!alpha)
    {
        free(red);
        free(green);
        free(blue);
        rb_raise(rb_eNoMemError,"Out of memory");
    }

    for(i=0; i<256; i++)
    {
        v = rb_ary_entry(palette, i);
        if((TYPE(v) == T_ARRAY) && (RARRAY_LEN(v) == 4))
        {
            r = rb_ary_entry(v,0);
            g = rb_ary_entry(v,1);
            b = rb_ary_entry(v,2);
            a = rb_ary_entry(v,3);
            if(rb_obj_is_kind_of(r, rb_cInteger) &&
               rb_obj_is_kind_of(g, rb_cInteger) &&
               rb_obj_is_kind_of(b, rb_cInteger) &&
               rb_obj_is_kind_of(a, rb_cInteger))
            {
                red[i]   = NUM2INT(r);
                green[i] = NUM2INT(g);
                blue[i]  = NUM2INT(b);
                alpha[i] = NUM2INT(a);
            } else
                error = 1;
        }
        else
            error = 1;
    }

    if(error)
    {
        free(red);
        free(green);
        free(blue);
        free(alpha);
        rb_raise(rb_eArgError, "Invalid palette");
    }

    if(caca_set_dither_palette(_SELF, red, green, blue, alpha)<0)
    {
        free(red);
        free(green);
        free(blue);
        free(alpha);
        rb_raise(rb_eRuntimeError, "%s", strerror(errno));
    }

    free(red);
    free(green);
    free(blue);
    free(alpha);

    return palette;
}

#set_algorithm ⇒ Object

#set_antialias ⇒ Object

#set_brightness ⇒ Object

#set_charset ⇒ Object

#set_color ⇒ Object

#set_contrast ⇒ Object

#set_gamma ⇒ Object

#set_palette(palette) ⇒ Object 



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# File 'ext/caca/caca-dither.c', line 135

static VALUE set_dither_palette2(VALUE self, VALUE palette)
{
    set_dither_palette(self, palette);
    return self;
}