Change preserve option to command line switch

Changes each adjustment method to take a preserve parameter when
setting the temperature instead of parsing the preserve option
from the command line/configuration file. This helps resolve the
issues around #513:

- This allows the preserve option to be implemented as a
  command-line switch (-P). This switch _disables_ the preservation
  of existing gamma ramps. Having a command-line switch makes it
  easier to use directly with manual or one-shot mode.
- The preserve options is on by default, so continual mode as well
  as other modes will default to applying the color adjustment
  on top of the current gamma ramps.
- Preserve is always disabled in reset mode so resetting works
  as expected again.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gamma-dummy.c b/src/gamma-dummy.c
index 25e723f..c2f2736 100644
--- a/src/gamma-dummy.c
+++ b/src/gamma-dummy.c
@@ -69,7 +69,8 @@ gamma_dummy_set_option(void *state, const char *key, const char *value)
 }
 
 static int
-gamma_dummy_set_temperature(void *state, const color_setting_t *setting)
+gamma_dummy_set_temperature(
+	void *state, const color_setting_t *setting, int preserve)
 {
 	printf(_("Temperature: %i\n"), setting->temperature);
 	return 0;