# HG changeset patch
# User Jeff Sparkes <jsparkes@gmail.com>
# Date 1301318715 14400
# Node ID 5256fedd50e6a02c8604791d6b8889860b1dcdda
# Parent  d363790fd936879ef0414abd81afd7ea7f25f3ee
issue 757 - tty device metric for num-color-cells

-------------------- ChangeLog entries follow: --------------------

src/ChangeLog addition:

2011-03-28  Jeff Sparkes  <jsparkes@gmail.com>

	* console-tty-impl.h (struct tty_console): Add field for number of
	displayable colors.
	* device-tty.c (tty_device_system_metrics): Return metrics for
	num-color-cells and num-bit-planes.  Tracker issue 757.
	* device.c: There are two required args for device-system-metric.
	* redisplay-tty.c (init_tty_for_redisplay): Retrieve number of
	colors from terminal description.  Default to 2 if none found.

diff -r d363790fd936 -r 5256fedd50e6 src/ChangeLog
--- a/src/ChangeLog	Wed Mar 23 00:08:35 2011 +0100
+++ b/src/ChangeLog	Mon Mar 28 09:25:15 2011 -0400
@@ -1,3 +1,13 @@
+2011-03-28  Jeff Sparkes  <jsparkes@gmail.com>
+
+	* console-tty-impl.h (struct tty_console): Add field for number of
+	displayable colors.
+	* device-tty.c (tty_device_system_metrics): Return metrics for
+	num-color-cells and num-bit-planes.  Tracker issue 757.
+	* device.c: There are two required args for device-system-metric.
+	* redisplay-tty.c (init_tty_for_redisplay): Retrieve number of
+	colors from terminal description.  Default to 2 if none found.
+
 2011-03-20  Mats Lidell  <matsl@xemacs.org>
 
 	* alloca.c (find_stack_direction):
diff -r d363790fd936 -r 5256fedd50e6 src/console-tty-impl.h
--- a/src/console-tty-impl.h	Wed Mar 23 00:08:35 2011 +0100
+++ b/src/console-tty-impl.h	Mon Mar 28 09:25:15 2011 -0400
@@ -63,6 +63,8 @@
   int height;
   int width;
 
+  int colors;
+
   /* The count of frame number. */
   int frame_count;
 
diff -r d363790fd936 -r 5256fedd50e6 src/device-tty.c
--- a/src/device-tty.c	Wed Mar 23 00:08:35 2011 +0100
+++ b/src/device-tty.c	Mon Mar 28 09:25:15 2011 -0400
@@ -196,6 +196,10 @@
     case DM_size_device:
       return Fcons (make_int (CONSOLE_TTY_DATA (con)->width),
 		    make_int (CONSOLE_TTY_DATA (con)->height));
+    case DM_num_bit_planes:
+      return make_int (log2 (CONSOLE_TTY_DATA (con)->colors));
+    case DM_num_color_cells:
+      return make_int (CONSOLE_TTY_DATA (con)->colors);
     default: /* No such device metric property for TTY devices */
       return Qunbound;
     }
diff -r d363790fd936 -r 5256fedd50e6 src/device.c
--- a/src/device.c	Wed Mar 23 00:08:35 2011 +0100
+++ b/src/device.c	Mon Mar 28 09:25:15 2011 -0400
@@ -1057,8 +1057,8 @@
   return DEVICE_PRINTER_P (decode_device (device)) ? Qt : Qnil;
 }
 
-DEFUN ("device-system-metric", Fdevice_system_metric, 1, 3, 0, /*
-Get a metric for DEVICE as provided by the system.
+DEFUN ("device-system-metric", Fdevice_system_metric, 2, 3, 0, /*
+Get DEVICE METRIC as provided by the system.
 
 METRIC must be a symbol specifying requested metric.  Note that the metrics
 returned are these provided by the system internally, not read from resources,
diff -r d363790fd936 -r 5256fedd50e6 src/redisplay-tty.c
--- a/src/redisplay-tty.c	Wed Mar 23 00:08:35 2011 +0100
+++ b/src/redisplay-tty.c	Mon Mar 28 09:25:15 2011 -0400
@@ -1116,6 +1116,13 @@
   if (CONSOLE_TTY_DATA (c)->width <= 0 || CONSOLE_TTY_DATA (c)->height <= 0)
     return TTY_SIZE_UNSPECIFIED;
 
+  CONSOLE_TTY_DATA (c)->colors = tgetnum("Co");
+  if (CONSOLE_TTY_DATA (c)->colors == 0)
+    CONSOLE_TTY_DATA (c)->colors = tgetnum("colors");
+  if (CONSOLE_TTY_DATA (c)->colors == 0)
+    /* There is always foreground and background. */
+    CONSOLE_TTY_DATA (c)->colors = 2;
+
   /*
    * Initialize cursor motion information.
    */