gdkPixbufRenderThresholdAlpha     package:RGtk2     R Documentation

_g_d_k_P_i_x_b_u_f_R_e_n_d_e_r_T_h_r_e_s_h_o_l_d_A_l_p_h_a

_D_e_s_c_r_i_p_t_i_o_n:

     Takes the opacity values in a rectangular portion of a pixbuf and
     thresholds them to produce a bi-level alpha mask that can be used
     as a clipping mask for a drawable.

_U_s_a_g_e:

     gdkPixbufRenderThresholdAlpha(object, bitmap, src.x, src.y, dest.x, dest.y, width = -1, height = -1, alpha.threshold)

_A_r_g_u_m_e_n_t_s:

'object': ['GdkPixbuf']  A pixbuf.

'bitmap': ['GdkBitmap']  Bitmap where the bilevel mask will be painted
          to.

 'src.x': [integer]  Source X coordinate.

 'src.y': [integer]  source Y coordinate.

'dest.x': [integer]  Destination X coordinate.

'dest.y': [integer]  Destination Y coordinate.

 'width': [integer]  Width of region to threshold, or -1 to use pixbuf
          width

'height': [integer]  Height of region to threshold, or -1 to use pixbuf
          height

'alpha.threshold': [integer]  Opacity values below this will be painted
          as zero; all other values will be painted as one.

_A_u_t_h_o_r(_s):

     Derived by RGtkGen from GTK+ documentation

