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; docformat = 'rst'
;
; NAME:
; cgSetColorState
;
; PURPOSE:
; Provides a device-independent way to set the color decomposition state of the
; current graphics device. Devices that do not have a DECOMPOSED keyword to the
; DEVICE command are assumed to be in indexed color mode always.
;
;******************************************************************************************;
; ;
; Copyright (c) 2010, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; Provides a device-independent way to set the color decomposition state of the
; current graphics device. Devices that do not have a DECOMPOSED keyword to the
; DEVICE command are assumed to be in indexed color mode always.
;
; I have removed the Z-graphics buffer from being controlled by this program. I
; do so reluctantly, but I am pragmatic enough to realize that progress forward
; is necessarily slow and that I must recognize the reality of legacy IDL code.
;
; My personal view is that all graphics routines should use 24-bit decomposed
; color. There are myriad advantages, but basically they boil down to this:
; (1) You have 16.7 million colors available to you simultaneously, and (2) you
; don't have to contaminate color tables to use drawing colors. Coyote Graphics
; routines are in the habit of switching out of whatever color mode the user happens
; to be using, into 24-bit decomposed color mode, then switching back when finished
; with its business. But, it is impossible to do this correctly in the Z-graphics
; buffer.
;
; The reason for this is that in the Z-graphics buffer, you need to switch not only
; the color mode, but also the pixel depth. In other words, I would prefer to set
; the Z-graphics buffer up like this::
;
; Set_Plot, 'Z'
; Device, Decomposed=1, Set_Pixel_Depth=24
;
; But, if I do that, then I need to set it back (for 99 people out of a 100) like this::
;
; Device, Decomposed=0, Set_Pixel_Depth=8
;
; Unfortunately, using this command will erase whatever is in the Z-graphics buffer!
;
; My solution to this problem is to leave it to the user to configure the Z-graphics buffer
; the way they want it. If you configure it to use 24-bit decomposed color, all of the Coyote
; Graphics routines will work as they normally do. If you configure it to use 8-bit indexed color,
; which is the default configuration, then it will work "normally", but you will be in great
; danger of contaminating the system color table. The reason for this is that Coyote Graphics
; cannot "restore" the entry color table in the Z-buffer without obliterating what is already
; in the graphics window. Users who work with indexed color are probably already very much
; aware of this problem, so it shouldn't surprise them. (They might not expect this with
; Coyote Graphics, but this is the price that has to be paid.)
;
; My suggestion is to put the Z-graphics configuration in your IDL startup file. Set it
; up in 24-bit decomposed color mode, use Coyote Graphics to do all your graphical output,
; and you will find things working perfectly.
; See `Configuring the Z-Graphics Buffer for Coyote Graphics <http://www.idlcoyote.com/cg_tips/configz.php>`
; for additional information.
;
; :Categories:
; Graphics, Utilities
;
; :Params:
; state: in, required, type=integer, default=0
; Set to 1 to set the current graphics device to decomposed color. Set to 0
; to set the current graphics device to indexed color. Devices lacking a
; DECOMPOSED keyword are assumed to be perpetually in indexed color mode.
; The Z-graphics buffer is always unchanged after the 24 Dec 2011 update.
;
; :Keywords:
; currentstate: out, optional, type=integer
; The current decomposition state of the current graphics device when the
; program is called. A 1 indicates decomposed color. A 0 indicates indexed
; color.
; depth: out, optional, type=integer
; The currnet pixel depth of the graphics device.
; zdepth: in, optional, type=integer
; The pixel depth of the Z-graphics device. Set to 8 or 24. Applies ONLY
; when setting the Z-graphics device state to 0. If undefined, the current
; depth of the Z-graphics device is unchanged from its current state. No
; longer used after 24 Dec 2011 update. Code still in place, however.
;
; :Examples:
; To set the device in color decomposition mode, then return it, do something like this::
;
; cgSetColorState, 1, CurrentState=theState
; ...
; cgSetColorState, theState
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
; Change History::
; Written, 16 November 2010. DWF.
; Changes to include SET_PIXEL_DEPTH in Z-graphics buffer. 19 Nov 2010. DWF.
; Allow PostScript 7.0 to set the decomposition keyword. 12 Dec 2010. DWF.
; Added DEPTH and ZDEPTH keywords. 31 Dec 2010. DWF.
; Added a do-nothing NULL device to Case statement. 4 Jan 2011. DWF.
; Removed the Z-graphics buffer from control by this program. 24 Dec 2011. DWF.
; Added back the ability to set decomposed state for the Z-buffer, but only
; if the depth buffer is 24-bits or higher. 25 May 2012. DWF.
; Renamed SetDecomposedState to cgSetColorState. 5 November 2013. DWF.
;
; :Copyright:
; Copyright (c) 2010-2013, Fanning Software Consulting, Inc.
;-
PRO cgSetColorState, state, CURRENTSTATE=currentState, DEPTH=depth, ZDEPTH=zdepth
Compile_Opt idl2
On_Error, 2
; Set to indexed color if you are not told differently.
state = Keyword_Set(state)
; Get the current state and pixel depth.
currentState = cgGetColorState(DEPTH=depth)
; Set the decomposition state, if you are able. Otherwise assume
; indexed color mode.
CASE StrUpCase(!D.Name) OF
'PS': IF (!Version.Release GE 7.1) THEN Device, Decomposed=state
'Z': BEGIN ; Z-Graphics Buffer ; See program notes for why the Z-buffer is no longer controlled here.
; IF Float(!Version.Release) GE 6.4 THEN BEGIN
; IF N_Elements(zdepth) NE 0 THEN BEGIN
; IF (zdepth NE 8) AND (zdepth NE 24) THEN Message, 'ZDEPTH must be set to 8 or 24.'
; ENDIF
; CASE state OF
; 0: BEGIN
;
; ; Set depth if you have it, otherwise, just leave it alone.
; IF N_Elements(zdepth) NE 0 THEN BEGIN
; Device, Decomposed=state, Set_Pixel_Depth=zdepth
; ENDIF ELSE BEGIN
; Device, Decomposed=state
; ENDELSE
; END
; 1: Device, Decomposed=state, Set_Pixel_Depth=24
; ENDCASE
; ENDIF
; I am going to allow the user to set the decomposed state, but only if
; they are using a buffer depth that will allow that.
IF (depth GE 24) THEN Device, Decomposed=state
END
'MAC': BEGIN
IF (Float(!Version.Release) GE 5.2) THEN Device, Decomposed=state
END
'X': Device, Decomposed=state
'WIN': Device, Decomposed=state
'NULL':
ELSE: Message, 'Unrecognized device. Assuming indexed color state.', /INFORMATIONAL
ENDCASE
END
|
