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XCreateGC(3X11) XLIB FUNCTIONS XCreateGC(3X11) NNAAMMEE XCreateGC, XCopyGC, XChangeGC, XGetGCValues, XFreeGC, XGContextFromGC, XGCValues - create or free graphics con- texts and graphics context structure SSYYNNTTAAXX GC XCreateGC(_d_i_s_p_l_a_y, _d, _v_a_l_u_e_m_a_s_k, _v_a_l_u_e_s) Display *_d_i_s_p_l_a_y; Drawable _d; unsigned long _v_a_l_u_e_m_a_s_k; XGCValues *_v_a_l_u_e_s; XCopyGC(_d_i_s_p_l_a_y, _s_r_c, _v_a_l_u_e_m_a_s_k, _d_e_s_t) Display *_d_i_s_p_l_a_y; GC _s_r_c, _d_e_s_t; unsigned long _v_a_l_u_e_m_a_s_k; XChangeGC(_d_i_s_p_l_a_y, _g_c, _v_a_l_u_e_m_a_s_k, _v_a_l_u_e_s) Display *_d_i_s_p_l_a_y; GC _g_c; unsigned long _v_a_l_u_e_m_a_s_k; XGCValues *_v_a_l_u_e_s; Status XGetGCValues(_d_i_s_p_l_a_y, _g_c, _v_a_l_u_e_m_a_s_k, _v_a_l_u_e_s___r_e_t_u_r_n) Display *_d_i_s_p_l_a_y; GC _g_c; unsigned long _v_a_l_u_e_m_a_s_k; XGCValues *_v_a_l_u_e_s___r_e_t_u_r_n; XFreeGC(_d_i_s_p_l_a_y, _g_c) Display *_d_i_s_p_l_a_y; GC _g_c; GContext XGContextFromGC(_g_c) GC _g_c; AARRGGUUMMEENNTTSS _d Specifies the drawable. _d_e_s_t Specifies the destination GC. _d_i_s_p_l_a_y Specifies the connection to the X server. _g_c Specifies the GC. _s_r_c Specifies the components of the source GC. _v_a_l_u_e_m_a_s_k Specifies which components in the GC are to be set, copied, changed, or returned . This argu- ment is the bitwise inclusive OR of zero or more of the valid GC component mask bits. _v_a_l_u_e_s Specifies any values as specified by the value- mask. X Version 11 Release 6.1 1 XCreateGC(3X11) XLIB FUNCTIONS XCreateGC(3X11) _v_a_l_u_e_s___r_e_t_u_r_n Returns the GC values in the specified _X_G_C_V_a_l_u_e_s structure. DDEESSCCRRIIPPTTIIOONN The _X_C_r_e_a_t_e_G_C function creates a graphics context and returns a GC. The GC can be used with any destination drawable having the same root and depth as the specified drawable. Use with other drawables results in a _B_a_d_M_a_t_c_h error. _X_C_r_e_a_t_e_G_C can generate _B_a_d_A_l_l_o_c, _B_a_d_D_r_a_w_a_b_l_e, _B_a_d_F_o_n_t, _B_a_d_M_a_t_c_h, _B_a_d_P_i_x_m_a_p, and _B_a_d_V_a_l_u_e errors. The _X_C_o_p_y_G_C function copies the specified components from the source GC to the destination GC. The source and des- tination GCs must have the same root and depth, or a _B_a_d_- _M_a_t_c_h error results. The valuemask specifies which compo- nent to copy, as for _X_C_r_e_a_t_e_G_C. _X_C_o_p_y_G_C can generate _B_a_d_A_l_l_o_c, _B_a_d_G_C, and _B_a_d_M_a_t_c_h errors. The _X_C_h_a_n_g_e_G_C function changes the components specified by valuemask for the specified GC. The values argument con- tains the values to be set. The values and restrictions are the same as for _X_C_r_e_a_t_e_G_C. Changing the clip-mask overrides any previous _X_S_e_t_C_l_i_p_R_e_c_t_a_n_g_l_e_s request on the context. Changing the dash-offset or dash-list overrides any previous _X_S_e_t_D_a_s_h_e_s request on the context. The order in which components are verified and altered is server dependent. If an error is generated, a subset of the com- ponents may have been altered. _X_C_h_a_n_g_e_G_C can generate _B_a_d_A_l_l_o_c, _B_a_d_F_o_n_t, _B_a_d_G_C, _B_a_d_M_a_t_c_h, _B_a_d_P_i_x_m_a_p, and _B_a_d_V_a_l_u_e errors. The _X_G_e_t_G_C_V_a_l_u_e_s function returns the components specified by valuemask for the specified GC. If the valuemask con- tains a valid set of GC mask bits (_G_C_F_u_n_c_t_i_o_n, _G_C_P_l_a_n_e_M_a_s_k, _G_C_F_o_r_e_g_r_o_u_n_d, _G_C_B_a_c_k_g_r_o_u_n_d, _G_C_L_i_n_e_W_i_d_t_h, _G_C_L_i_n_e_S_t_y_l_e, _G_C_C_a_p_S_t_y_l_e, _G_C_J_o_i_n_S_t_y_l_e, _G_C_F_i_l_l_S_t_y_l_e, _G_C_F_i_l_l_R_u_l_e, _G_C_T_i_l_e, _G_C_S_t_i_p_p_l_e, _G_C_T_i_l_e_S_t_i_p_X_O_r_i_g_i_n, _G_C_T_i_l_e_S_t_i_p_Y_O_r_i_g_i_n, _G_C_F_o_n_t, _G_C_S_u_b_w_i_n_d_o_w_M_o_d_e, _G_C_G_r_a_p_h_i_c_s_E_x_p_o_s_u_r_e_s, _G_C_C_l_i_p_X_O_r_i_g_i_n, _G_C_C_L_i_p_Y_O_r_i_g_i_n, _G_C_D_a_s_h_O_f_f_s_e_t, or _G_C_A_r_c_M_o_d_e) and no error occurs, _X_G_e_t_G_C_- _V_a_l_u_e_s sets the requested components in values_return and returns a nonzero status. Otherwise, it returns a zero status. Note that the clip-mask and dash-list (repre- sented by the _G_C_C_l_i_p_M_a_s_k and _G_C_D_a_s_h_L_i_s_t bits, respec- tively, in the valuemask) cannot be requested. Also note that an invalid resource ID (with one or more of the three most significant bits set to 1) will be returned for _G_C_F_o_n_t, _G_C_T_i_l_e, and _G_C_S_t_i_p_p_l_e if the component has never been explicitly set by the client. X Version 11 Release 6.1 2 XCreateGC(3X11) XLIB FUNCTIONS XCreateGC(3X11) The _X_F_r_e_e_G_C function destroys the specified GC as well as all the associated storage. _X_F_r_e_e_G_C can generate a _B_a_d_G_C error. SSTTRRUUCCTTUURREESS The _X_G_C_V_a_l_u_e_s structure contains: /* GC attribute value mask bits */ #define _G_C_F_u_n_c_t_i_o_n (1L<<0) #define _G_C_P_l_a_n_e_M_a_s_k (1L<<1) #define _G_C_F_o_r_e_g_r_o_u_n_d (1L<<2) #define _G_C_B_a_c_k_g_r_o_u_n_d (1L<<3) #define _G_C_L_i_n_e_W_i_d_t_h (1L<<4) #define _G_C_L_i_n_e_S_t_y_l_e (1L<<5) #define _G_C_C_a_p_S_t_y_l_e (1L<<6) #define _G_C_J_o_i_n_S_t_y_l_e (1L<<7) #define _G_C_F_i_l_l_S_t_y_l_e (1L<<8) #define _G_C_F_i_l_l_R_u_l_e (1L<<9) #define _G_C_T_i_l_e (1L<<10) #define _G_C_S_t_i_p_p_l_e (1L<<11) #define _G_C_T_i_l_e_S_t_i_p_X_O_r_i_g_i_n (1L<<12) #define _G_C_T_i_l_e_S_t_i_p_Y_O_r_i_g_i_n (1L<<13) #define _G_C_F_o_n_t (1L<<14) #define _G_C_S_u_b_w_i_n_d_o_w_M_o_d_e (1L<<15) #define _G_C_G_r_a_p_h_i_c_s_E_x_p_o_s_u_r_e_s (1L<<16) #define _G_C_C_l_i_p_X_O_r_i_g_i_n (1L<<17) #define _G_C_C_l_i_p_Y_O_r_i_g_i_n (1L<<18) #define _G_C_C_l_i_p_M_a_s_k (1L<<19) #define _G_C_D_a_s_h_O_f_f_s_e_t (1L<<20) #define _G_C_D_a_s_h_L_i_s_t (1L<<21) #define _G_C_A_r_c_M_o_d_e (1L<<22) /* Values */ typedef struct { int function; /* logical operation */ unsigned long plane_mask;/* plane mask */ unsigned long foreground;/* foreground pixel */ unsigned long background;/* background pixel */ int line_width; /* line width (in pixels) */ int line_style; /* LineSolid, LineOnOffDash, LineDoubleDash */ int cap_style; /* CapNotLast, CapButt, CapRound, CapProjecting */ int join_style; /* JoinMiter, JoinRound, JoinBevel */ int fill_style; /* FillSolid, FillTiled, FillStippled FillOpaqueStippled*/ int fill_rule; /* EvenOddRule, WindingRule */ int arc_mode; /* ArcChord, ArcPieSlice */ Pixmap tile; /* tile pixmap for tiling operations */ Pixmap stipple; /* stipple 1 plane pixmap for stippling */ int ts_x_origin; /* offset for tile or stipple operations */ int ts_y_origin; Font font; /* default text font for text operations */ int subwindow_mode; /* ClipByChildren, IncludeInferiors */ Bool graphics_exposures; /* boolean, should exposures be generated */ X Version 11 Release 6.1 3 XCreateGC(3X11) XLIB FUNCTIONS XCreateGC(3X11) int clip_x_origin; /* origin for clipping */ int clip_y_origin; Pixmap clip_mask; /* bitmap clipping; other calls for rects */ int dash_offset; /* patterned/dashed line information */ char dashes; } XGCValues; The function attributes of a GC are used when you update a section of a drawable (the destination) with bits from somewhere else (the source). The function in a GC defines how the new destination bits are to be computed from the source bits and the old destination bits. _G_X_c_o_p_y is typi- cally the most useful because it will work on a color dis- play, but special applications may use other functions, particularly in concert with particular planes of a color display. The 16 GC functions, defined in <_X_1_1_/_X_._h>, are: ----------------------------------------------- FFuunnccttiioonn NNaammee VVaalluuee OOppeerraattiioonn ----------------------------------------------- _G_X_c_l_e_a_r 0x0 0 _G_X_a_n_d 0x1 src AND dst _G_X_a_n_d_R_e_v_e_r_s_e 0x2 src AND NOT dst _G_X_c_o_p_y 0x3 src _G_X_a_n_d_I_n_v_e_r_t_e_d 0x4 (NOT src) AND dst _G_X_n_o_o_p 0x5 dst _G_X_x_o_r 0x6 src XOR dst _G_X_o_r 0x7 src OR dst _G_X_n_o_r 0x8 (NOT src) AND (NOT dst) _G_X_e_q_u_i_v 0x9 (NOT src) XOR dst _G_X_i_n_v_e_r_t 0xa NOT dst _G_X_o_r_R_e_v_e_r_s_e 0xb src OR (NOT dst) _G_X_c_o_p_y_I_n_v_e_r_t_e_d 0xc NOT src _G_X_o_r_I_n_v_e_r_t_e_d 0xd (NOT src) OR dst _G_X_n_a_n_d 0xe (NOT src) OR (NOT dst) _G_X_s_e_t 0xf 1 ----------------------------------------------- Many graphics operations depend on either pixel values or planes in a GC. The planes attribute is of type long, and it specifies which planes of the destination are to be modified, one bit per plane. A monochrome display has only one plane and will be the least significant bit of the word. As planes are added to the display hardware, they will occupy more significant bits in the plane mask. In graphics operations, given a source and destination pixel, the result is computed bitwise on corresponding bits of the pixels. That is, a Boolean operation is per- formed in each bit plane. The plane_mask restricts the operation to a subset of planes. A macro constant _A_l_l_P_l_a_n_e_s can be used to refer to all planes of the screen simultaneously. The result is computed by the following: X Version 11 Release 6.1 4 () () ((src FUNC dst) AND plane-mask) OR (dst AND (NOT plane-mask)) Range checking is not performed on the values for fore- ground, background, or plane_mask. They are simply trun- cated to the appropriate number of bits. The line-width is measured in pixels and either can be greater than or equal to one (wide line) or can be the special value zero (thin line). Wide lines are drawn centered on the path described by the graphics request. Unless otherwise specified by the join- style or cap-style, the bounding box of a wide line with endpoints [x1, y1], [x2, y2] and width w is a rectangle with vertices at the following real coordinates: [x1-(w*sn/2), y1+(w*cs/2)], [x1+(w*sn/2), y1-(w*cs/2)], [x2-(w*sn/2), y2+(w*cs/2)], [x2+(w*sn/2), y2-(w*cs/2)] Here sn is the sine of the angle of the line, and cs is the cosine of the angle of the line. A pixel is part of the line and so is drawn if the center of the pixel is fully inside the bounding box (which is viewed as having infinitely thin edges). If the center of the pixel is exactly on the bounding box, it is part of the line if and only if the interior is immediately to its right (x increasing direction). Pixels with centers on a horizon- tal edge are a special case and are part of the line if and only if the interior or the boundary is immediately below (y increasing direction) and the interior or the boundary is immediately to the right (x increasing direc- tion). Thin lines (zero line-width) are one-pixel-wide lines drawn using an unspecified, device-dependent algorithm. There are only two constraints on this algorithm. 1. If a line is drawn unclipped from [x1,y1] to [x2,y2] and if another line is drawn unclipped from [x1+dx,y1+dy] to [x2+dx,y2+dy], a point [x,y] is touched by drawing the first line if and only if the point [x+dx,y+dy] is touched by drawing the second line. 2. The effective set of points comprising a line cannot be affected by clipping. That is, a point is touched in a clipped line if and only if the point lies inside the clipping region and the point would be touched by the line when drawn unclipped. A wide line drawn from [x1,y1] to [x2,y2] always draws the same pixels as a wide line drawn from [x2,y2] to [x1,y1], not counting cap-style and join-style. It is recommended that this property be true for thin lines, but this is not required. A line-width of zero may differ from a line- 5 () () width of one in which pixels are drawn. This permits the use of many manufacturers' line drawing hardware, which may run many times faster than the more precisely speci- fied wide lines. In general, drawing a thin line will be faster than draw- ing a wide line of width one. However, because of their different drawing algorithms, thin lines may not mix well aesthetically with wide lines. If it is desirable to obtain precise and uniform results across all displays, a client should always use a line-width of one rather than a line-width of zero. The line-style defines which sections of a line are drawn: _L_i_n_e_S_o_l_i_d The full path of the line is drawn. _L_i_n_e_D_o_u_- The full path of the line is drawn, but the _b_l_e_D_a_s_h even dashes are filled differently from the odd dashes (see fill-style) with _C_a_p_B_u_t_t style used where even and odd dashes meet. _L_i_n_e_O_n_O_f_f_D_a_s_h Only the even dashes are drawn, and cap-style applies to all internal ends of the individ- ual dashes, except _C_a_p_N_o_t_L_a_s_t is treated as _C_a_p_B_u_t_t. The cap-style defines how the endpoints of a path are drawn: _C_a_p_N_o_t_L_a_s_t This is equivalent to _C_a_p_B_u_t_t except that for a line-width of zero the final endpoint is not drawn. _C_a_p_B_u_t_t The line is square at the endpoint (perpen- dicular to the slope of the line) with no projection beyond. _C_a_p_R_o_u_n_d The line has a circular arc with the diameter equal to the line-width, centered on the end- point. (This is equivalent to _C_a_p_B_u_t_t for line-width of zero). _C_a_p_P_r_o_j_e_c_t_i_n_g The line is square at the end, but the path continues beyond the endpoint for a distance equal to half the line-width. (This is equivalent to _C_a_p_B_u_t_t for line-width of zero). The join-style defines how corners are drawn for wide lines: _J_o_i_n_M_i_t_e_r The outer edges of two lines extend to meet at an angle. However, if the angle is less than 11 degrees, then a _J_o_i_n_B_e_v_e_l join-style is used instead. _J_o_i_n_R_o_u_n_d The corner is a circular arc with the diame- ter equal to the line-width, centered on the joinpoint. _J_o_i_n_B_e_v_e_l The corner has _C_a_p_B_u_t_t endpoint styles with the triangular notch filled. 6 () () For a line with coincident endpoints (x1=x2, y1=y2), when the cap-style is applied to both endpoints, the semantics depends on the line-width and the cap-style: _C_a_p_N_o_t_L_a_s_t thin The results are device dependent, but the desired effect is that nothing is drawn. _C_a_p_B_u_t_t thin The results are device dependent, but the desired effect is that a single pixel is drawn. _C_a_p_R_o_u_n_d thin The results are the same as for _C_a_p_B_u_t_t/thin. _C_a_p_P_r_o_j_e_c_t_i_n_g thin The results are the same as for _C_a_p_B_u_t_t/thin. _C_a_p_B_u_t_t wide Nothing is drawn. _C_a_p_R_o_u_n_d wide The closed path is a circle, centered at the endpoint, and with the diameter equal to the line-width. _C_a_p_P_r_o_j_e_c_t_i_n_g wide The closed path is a square, aligned with the coordinate axes, centered at the endpoint, and with the sides equal to the line-width. For a line with coincident endpoints (x1=x2, y1=y2), when the join-style is applied at one or both endpoints, the effect is as if the line was removed from the overall path. However, if the total path consists of or is reduced to a single point joined with itself, the effect is the same as when the cap-style is applied at both end- points. The tile/stipple represents an infinite two-dimensional plane, with the tile/stipple replicated in all dimensions. When that plane is superimposed on the drawable for use in a graphics operation, the upper-left corner of some instance of the tile/stipple is at the coordinates within the drawable specified by the tile/stipple origin. The tile/stipple and clip origins are interpreted relative to the origin of whatever destination drawable is specified in a graphics request. The tile pixmap must have the same root and depth as the GC, or a _B_a_d_M_a_t_c_h error results. The stipple pixmap must have depth one and must have the same root as the GC, or a _B_a_d_M_a_t_c_h error results. For stipple operations where the fill-style is _F_i_l_l_S_t_i_p_p_l_e_d but not _F_i_l_l_O_p_a_q_u_e_S_t_i_p_p_l_e_d, the stipple pattern is tiled in a single plane and acts as an additional clip mask to be ANDed with the clip-mask. Although some sizes may be faster to use than others, any size pixmap can be used for tiling or stippling. The fill-style defines the contents of the source for line, text, and fill requests. For all text and fill requests (for example, _X_D_r_a_w_T_e_x_t, _X_D_r_a_w_T_e_x_t_1_6, _X_F_i_l_l_R_e_c_t_a_n_g_l_e, _X_F_i_l_l_P_o_l_y_g_o_n, and _X_F_i_l_l_A_r_c); for line requests with line-style _L_i_n_e_S_o_l_i_d (for example, 7 () () _X_D_r_a_w_L_i_n_e, _X_D_r_a_w_S_e_g_m_e_n_t_s, _X_D_r_a_w_R_e_c_t_a_n_g_l_e, _X_D_r_a_w_A_r_c); and for the even dashes for line requests with line-style _L_i_n_e_O_n_O_f_f_D_a_s_h or _L_i_n_e_D_o_u_b_l_e_D_a_s_h, the following apply: _F_i_l_l_S_o_l_i_d Foreground _F_i_l_l_T_i_l_e_d Tile _F_i_l_l_O_p_a_q_u_e_S_t_i_p_p_l_e_d A tile with the same width and height as stipple, but with background everywhere stipple has a zero and with foreground everywhere stipple has a one _F_i_l_l_S_t_i_p_p_l_e_d Foreground masked by stipple When drawing lines with line-style _L_i_n_e_D_o_u_b_l_e_D_a_s_h, the odd dashes are controlled by the fill-style in the following manner: _F_i_l_l_S_o_l_i_d Background _F_i_l_l_T_i_l_e_d Same as for even dashes _F_i_l_l_O_p_a_q_u_e_S_t_i_p_p_l_e_d Same as for even dashes _F_i_l_l_S_t_i_p_p_l_e_d Background masked by stipple Storing a pixmap in a GC might or might not result in a copy being made. If the pixmap is later used as the des- tination for a graphics request, the change might or might not be reflected in the GC. If the pixmap is used simul- taneously in a graphics request both as a destination and as a tile or stipple, the results are undefined. For optimum performance, you should draw as much as possi- ble with the same GC (without changing its components). The costs of changing GC components relative to using dif- ferent GCs depend on the display hardware and the server implementation. It is quite likely that some amount of GC information will be cached in display hardware and that such hardware can only cache a small number of GCs. The dashes value is actually a simplified form of the more general patterns that can be set with _X_S_e_t_D_a_s_h_e_s. Speci- fying a value of N is equivalent to specifying the two- element list [N, N] in _X_S_e_t_D_a_s_h_e_s. The value must be nonzero, or a _B_a_d_V_a_l_u_e error results. The clip-mask restricts writes to the destination draw- able. If the clip-mask is set to a pixmap, it must have depth one and have the same root as the GC, or a _B_a_d_M_a_t_c_h error results. If clip-mask is set to _N_o_n_e, the pixels are always drawn regardless of the clip origin. The clip- mask also can be set by calling the _X_S_e_t_C_l_i_p_R_e_c_t_a_n_g_l_e_s or _X_S_e_t_R_e_g_i_o_n functions. Only pixels where the clip-mask has a bit set to 1 are drawn. Pixels are not drawn outside the area covered by the clip-mask or where the clip-mask has a bit set to 0. The clip-mask affects all graphics requests. The clip-mask does not clip sources. The clip- mask origin is interpreted relative to the origin of what- ever destination drawable is specified in a graphics request. 8 () () You can set the subwindow-mode to _C_l_i_p_B_y_C_h_i_l_d_r_e_n or _I_n_c_l_u_d_e_I_n_f_e_r_i_o_r_s. For _C_l_i_p_B_y_C_h_i_l_d_r_e_n, both source and destination windows are additionally clipped by all view- able _I_n_p_u_t_O_u_t_p_u_t children. For _I_n_c_l_u_d_e_I_n_f_e_r_i_o_r_s, neither source nor destination window is clipped by inferiors. This will result in including subwindow contents in the source and drawing through subwindow boundaries of the destination. The use of _I_n_c_l_u_d_e_I_n_f_e_r_i_o_r_s on a window of one depth with mapped inferiors of differing depth is not illegal, but the semantics are undefined by the core pro- tocol. The fill-rule defines what pixels are inside (drawn) for paths given in _X_F_i_l_l_P_o_l_y_g_o_n requests and can be set to _E_v_e_n_O_d_d_R_u_l_e or _W_i_n_d_i_n_g_R_u_l_e. For _E_v_e_n_O_d_d_R_u_l_e, a point is inside if an infinite ray with the point as origin crosses the path an odd number of times. For _W_i_n_d_i_n_g_R_u_l_e, a point is inside if an infinite ray with the point as origin crosses an unequal number of clockwise and counterclock- wise directed path segments. A clockwise directed path segment is one that crosses the ray from left to right as observed from the point. A counterclockwise segment is one that crosses the ray from right to left as observed from the point. The case where a directed line segment is coincident with the ray is uninteresting because you can simply choose a different ray that is not coincident with a segment. For both _E_v_e_n_O_d_d_R_u_l_e and _W_i_n_d_i_n_g_R_u_l_e, a point is infinitely small, and the path is an infinitely thin line. A pixel is inside if the center point of the pixel is inside and the center point is not on the boundary. If the center point is on the boundary, the pixel is inside if and only if the polygon interior is immediately to its right (x increasing direction). Pixels with centers on a horizontal edge are a special case and are inside if and only if the polygon interior is immediately below (y increasing direction). The arc-mode controls filling in the _X_F_i_l_l_A_r_c_s function and can be set to _A_r_c_P_i_e_S_l_i_c_e or _A_r_c_C_h_o_r_d. For _A_r_c_P_i_e_S_l_i_c_e, the arcs are pie-slice filled. For _A_r_c_C_h_o_r_d, the arcs are chord filled. The graphics-exposure flag controls _G_r_a_p_h_i_c_s_E_x_p_o_s_e event generation for _X_C_o_p_y_A_r_e_a and _X_C_o_p_y_P_l_a_n_e requests (and any similar requests defined by extensions). DDIIAAGGNNOOSSTTIICCSS _B_a_d_A_l_l_o_c The server failed to allocate the requested resource or server memory. _B_a_d_D_r_a_w_a_b_l_e A value for a Drawable argument does not name a 9 () () defined Window or Pixmap. _B_a_d_F_o_n_t A value for a Font or GContext argument does not name a defined Font. _B_a_d_G_C A value for a GContext argument does not name a defined GContext. _B_a_d_M_a_t_c_h An _I_n_p_u_t_O_n_l_y window is used as a Drawable. _B_a_d_M_a_t_c_h Some argument or pair of arguments has the cor- rect type and range but fails to match in some other way required by the request. _B_a_d_P_i_x_m_a_p A value for a Pixmap argument does not name a defined Pixmap. _B_a_d_V_a_l_u_e Some numeric value falls outside the range of values accepted by the request. Unless a spe- cific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error. SSEEEE AALLSSOO AllPlanes(3X11), XCopyArea(3X11), XCreateRegion(3X11), XDrawArc(3X11), XDrawLine(3X11), XDrawRectangle(3X11), XDrawText(3X11), XFillRectangle(3X11), XQueryBest- Size(3X11), XSetArcMode(3X11), XSetClipOrigin(3X11), XSet- FillStyle(3X11), XSetFont(3X11), XSetLineAttributes(3X11), XSetState(3X11), XSetTile(3X11) _X_l_i_b _- _C _L_a_n_g_u_a_g_e _X _I_n_t_e_r_f_a_c_e 10