Class: Cairo::ImageSurface

Inherits:

Surface

• Object
• Surface
• Cairo::ImageSurface

Defined in:

ext/cairo/rb_cairo_surface.c

Class Method Summary

• .from_png ⇒ Object

Instance Method Summary

• #data ⇒ Object
• #format ⇒ Object
• #height ⇒ Object
• #initialize ⇒ Object constructor
• #stride ⇒ Object
• #width ⇒ Object

Methods inherited from Surface

#clone, #content, #copy_page, #create_similar, #create_similar_image, #destroy, #device, #device_offset, #dup, #fallback_resolution, #finish, #flush, #font_options, #get_mime_data, gl_supported?, gl_texture_supported?, image_supported?, #map_to_image, #mark_dirty, pdf_supported?, ps_supported?, quartz_image_supported?, quartz_supported?, recording_supported?, script_supported?, #set_device_offset, #set_fallback_resolution, #set_mime_data, #show_page, #sub_rectangle_surface, supported?, #supported_mime_type?, svg_supported?, tee_supported?, #unmap_image, win32_printing_supported?, win32_supported?, #write_to_png, xml_supported?

Constructor Details

#initialize ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 949

static VALUE
cr_image_surface_initialize (int argc, VALUE *argv, VALUE self)
{
  cairo_surface_t *surface;
  VALUE arg1, arg2, arg3, arg4, arg5;
  int n;

  n = rb_scan_args (argc, argv, "23", &arg1, &arg2, &arg3, &arg4, &arg5);

  if (n == 2)
    surface = cr_image_surface_create (self, Qnil, arg1, arg2);
  else if (n == 3)
    surface = cr_image_surface_create (self, arg1, arg2, arg3);
  else if (n == 5)
    surface =
      cr_image_surface_create_for_data (self, arg1, arg2, arg3, arg4, arg5);
  else
    rb_raise (rb_eArgError,
              "invalid argument (expect "
              "(width, height) or "
              "(format, width, height) or "
              "(data, format, width, height, stride)): %s",
              rb_cairo__inspect (rb_ary_new3 (4, arg1, arg2, arg3, arg4)));

  cr_surface_check_status (surface);
  DATA_PTR (self) = surface;
  if (rb_block_given_p ())
    yield_and_finish (self);
  return Qnil;
}

Class Method Details

.from_png ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 904

static VALUE
cr_image_surface_create_from_png_generic (VALUE klass, VALUE target)
{
  VALUE rb_surface;
  cairo_surface_t *surface;

  if (rb_respond_to (target, rb_cairo__io_id_read))
    surface = cr_image_surface_create_from_png_stream (target);
  else
    surface = cr_image_surface_create_from_png (target);

  cr_surface_check_status (surface);
  rb_surface = cr_surface_allocate (klass);
  DATA_PTR (rb_surface) = surface;
  return rb_surface;
}

Instance Method Details

#data ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 980

static VALUE
cr_image_surface_get_data (VALUE self)
{
  unsigned char *data;
  cairo_surface_t *surface;

  surface = _SELF;
  data = cairo_image_surface_get_data (surface);

  if (data)
    return rb_str_new ((const char *)data,
                       cairo_image_surface_get_stride (surface) *
                       cairo_image_surface_get_height (surface));
  else
    return Qnil;
}

#format ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 997

static VALUE
cr_image_surface_get_format (VALUE self)
{
  return INT2NUM (cairo_image_surface_get_format (_SELF));
}

#height ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 1009

static VALUE
cr_image_surface_get_height (VALUE self)
{
  return INT2NUM (cairo_image_surface_get_height (_SELF));
}

#stride ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 1015

static VALUE
cr_image_surface_get_stride (VALUE self)
{
  return INT2NUM (cairo_image_surface_get_stride (_SELF));
}

#width ⇒ Object

# File 'ext/cairo/rb_cairo_surface.c', line 1003

static VALUE
cr_image_surface_get_width (VALUE self)
{
  return INT2NUM (cairo_image_surface_get_width (_SELF));
}