Class: GMagick::Image

Inherits:
Object
  • Object
show all
Defined in:
ext/image/image.c

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rb_image_blob) ⇒ Object 



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# File 'ext/image/image.c', line 23

VALUE image_initialize(VALUE self, VALUE rb_image_blob)
{
  MagickWand *magick_wand;

  InitializeMagick(".");

  magick_wand = NewMagickWand();

  long double image_blob_length = RSTRING_LEN(rb_image_blob);
  char *image_blob = RSTRING_PTR(rb_image_blob);
  MagickReadImageBlob(magick_wand, (const unsigned char *)image_blob, image_blob_length);

  VALUE rb_wand = Data_Wrap_Struct(rb_cObject, NULL, NULL, magick_wand);

  rb_funcall(self, rb_intern("wand="), 1, rb_wand);
  rb_funcall(self, rb_intern("blob="), 1, rb_image_blob);

  return Qtrue;
}

Instance Attribute Details

#blob ⇒ Object

Define our instance methods

#wand ⇒ Object

Class Method Details

.format(rb_image_blob) ⇒ Object

Define our class methods



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# File 'ext/image/image.c', line 5

VALUE format(VALUE self, VALUE rb_image_blob)
{
  const char *format = NULL;
  long double image_blob_length = RSTRING_LEN(rb_image_blob);
  char *image_blob = RSTRING_PTR(rb_image_blob);

  InitializeMagick(".");
  MagickWand *magick_wand = NewMagickWand();
  MagickReadImageBlob(magick_wand, (const unsigned char *)image_blob, image_blob_length);
  format = MagickGetImageFormat(magick_wand);

  if (format) {
    return rb_str_new2(format);
  } else {
    return Qnil;
  }
}

Instance Method Details

#alpha_unpack ⇒ Object 



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# File 'ext/image/image.c', line 116

VALUE image_alpha_unpack(VALUE self)
{
  VALUE rb_wand = rb_funcall(self, rb_intern("wand"), 0);
  MagickWand *magick_wand;
  Data_Get_Struct(rb_wand, MagickWand, magick_wand);
  int height = NUM2INT( rb_funcall(self, rb_intern("height"), 0) );
  int width = NUM2INT( rb_funcall(self, rb_intern("width"), 0) );
  int pixel_count = height * width;
  unsigned char *pixels;

  pixels = (unsigned char *)malloc(pixel_count * sizeof(char));
  MagickGetImagePixels(magick_wand, 0, 0, width, height, "A", CharPixel, pixels);
  return rb_str_new((const char *)pixels, pixel_count);
}

#colorspace ⇒ Object 



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# File 'ext/image/image.c', line 71

VALUE image_colorspace(VALUE self)
{
  VALUE rb_wand = rb_funcall(self, rb_intern("wand"), 0);
  MagickWand *magick_wand;
  Data_Get_Struct(rb_wand, MagickWand, magick_wand);
  ColorspaceType color_space = MagickGetImageColorspace(magick_wand);
  if (color_space == RGBColorspace) {
    return ID2SYM(rb_intern("DeviceRGB"));
  } else if (color_space == CMYKColorspace) {
    return ID2SYM(rb_intern("DeviceCMYK"));
  } else {
    rb_raise(rb_eTypeError, "Unknown colorspace");
  }
}

#depth ⇒ Object 



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# File 'ext/image/image.c', line 43

VALUE image_depth(VALUE self)
{
  VALUE rb_wand = rb_funcall(self, rb_intern("wand"), 0);
  MagickWand *magick_wand;
  Data_Get_Struct(rb_wand, MagickWand, magick_wand);

  unsigned long depth = MagickGetImageChannelDepth(magick_wand, RedChannel);
  return INT2NUM(depth);
}

#height ⇒ Object 



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# File 'ext/image/image.c', line 62

VALUE image_height(VALUE self)
{
  VALUE rb_wand = rb_funcall(self, rb_intern("wand"), 0);
  MagickWand *magick_wand;
  Data_Get_Struct(rb_wand, MagickWand, magick_wand);
  unsigned long height = MagickGetImageHeight(magick_wand);
  return INT2NUM(height);
}

#unpack ⇒ Object 



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# File 'ext/image/image.c', line 86

VALUE image_unpack(VALUE self)
{
  VALUE rb_wand = rb_funcall(self, rb_intern("wand"), 0);
  MagickWand *magick_wand;
  Data_Get_Struct(rb_wand, MagickWand, magick_wand);
  ColorspaceType color_space = MagickGetImageColorspace(magick_wand);

  int height = NUM2INT( rb_funcall(self, rb_intern("height"), 0) );
  int width = NUM2INT( rb_funcall(self, rb_intern("width"), 0) );
  int pixel_count = height * width;
  int buffer_size;
  char color_format[8];
  unsigned char *pixels;

  if (color_space == RGBColorspace) {
     buffer_size = 3 * pixel_count;
     strcpy(color_format, "RGB");
  } else if (color_space == CMYKColorspace) {
     buffer_size = 4 * pixel_count;
     strcpy(color_format, "CMYK");
  } else {
    rb_raise(rb_eTypeError, "Unknown colorspace");
  }

  pixels = (unsigned char *)malloc(buffer_size * sizeof(char));
  MagickGetImagePixels(magick_wand, 0, 0, width, height, color_format, CharPixel, pixels);

  return rb_str_new((const char *)pixels, buffer_size);
}

#width ⇒ Object 



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# File 'ext/image/image.c', line 53

VALUE image_width(VALUE self)
{
  VALUE rb_wand = rb_funcall(self, rb_intern("wand"), 0);
  MagickWand *magick_wand;
  Data_Get_Struct(rb_wand, MagickWand, magick_wand);
  unsigned long width = MagickGetImageWidth(magick_wand);
  return INT2NUM(width);
}