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Save and restore ramps with VidMode.

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This commit is contained in:
Jon Lund Steffensen
2010-01-01 19:40:50 +01:00
parent b61c9d59d7
commit 4560aae206
2 changed files with 62 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/vidmode.c
+60 -21
View File
@@ -52,12 +52,53 @@ vidmode_init(vidmode_state_t *state, int screen_num)
return -1;
}
/* Request size of gamma ramps */
r = XF86VidModeGetGammaRampSize(state->display, state->screen_num,
&state->ramp_size);
if (!r) {
fprintf(stderr, "XF86VidModeGetGammaRampSize failed.\n");
XCloseDisplay(state->display);
return -1;
}
if (state->ramp_size == 0) {
fprintf(stderr, "Gamma ramp size too small: %i\n",
state->ramp_size);
XCloseDisplay(state->display);
return -1;
}
/* Allocate space for saved gamma ramps */
state->saved_ramps = malloc(3*state->ramp_size*sizeof(uint16_t));
if (state->saved_ramps == NULL) {
perror("malloc");
XCloseDisplay(state->display);
return -1;
}
uint16_t *gamma_r = &state->saved_ramps[0*state->ramp_size];
uint16_t *gamma_g = &state->saved_ramps[1*state->ramp_size];
uint16_t *gamma_b = &state->saved_ramps[2*state->ramp_size];
/* Save current gamma ramps so we can restore them at program exit. */
r = XF86VidModeGetGammaRamp(state->display, state->screen_num,
state->ramp_size, gamma_r, gamma_g,
gamma_b);
if (!r) {
fprintf(stderr, "XF86VidModeGetGammaRamp failed.\n");
XCloseDisplay(state->display);
return -1;
}
return 0;
}
void
vidmode_free(vidmode_state_t *state)
{
/* Free saved ramps */
free(state->saved_ramps);
/* Close display connection */
XCloseDisplay(state->display);
}
@@ -65,6 +106,17 @@ vidmode_free(vidmode_state_t *state)
void
vidmode_restore(vidmode_state_t *state)
{
uint16_t *gamma_r = &state->saved_ramps[0*state->ramp_size];
uint16_t *gamma_g = &state->saved_ramps[1*state->ramp_size];
uint16_t *gamma_b = &state->saved_ramps[2*state->ramp_size];
/* Restore gamma ramps */
int r = XF86VidModeSetGammaRamp(state->display, state->screen_num,
state->ramp_size, gamma_r, gamma_g,
gamma_b);
if (!r) {
fprintf(stderr, "XF86VidModeSetGammaRamp failed.\n");
}
}
int
@@ -72,37 +124,24 @@ vidmode_set_temperature(vidmode_state_t *state, int temp, float gamma[3])
{
int r;
/* Request size of gamma ramps */
int ramp_size;
r = XF86VidModeGetGammaRampSize(state->display, state->screen_num,
&ramp_size);
if (!r) {
fprintf(stderr, "XF86VidModeGetGammaRampSize failed.\n");
return -1;
}
if (ramp_size == 0) {
fprintf(stderr, "Gamma ramp size too small: %i\n",
ramp_size);
return -1;
}
/* Create new gamma ramps */
uint16_t *gamma_ramps = malloc(3*ramp_size*sizeof(uint16_t));
uint16_t *gamma_ramps = malloc(3*state->ramp_size*sizeof(uint16_t));
if (gamma_ramps == NULL) {
perror("malloc");
return -1;
}
uint16_t *gamma_r = &gamma_ramps[0*ramp_size];
uint16_t *gamma_g = &gamma_ramps[1*ramp_size];
uint16_t *gamma_b = &gamma_ramps[2*ramp_size];
uint16_t *gamma_r = &gamma_ramps[0*state->ramp_size];
uint16_t *gamma_g = &gamma_ramps[1*state->ramp_size];
uint16_t *gamma_b = &gamma_ramps[2*state->ramp_size];
colorramp_fill(gamma_r, gamma_g, gamma_b, ramp_size, temp, gamma);
colorramp_fill(gamma_r, gamma_g, gamma_b, state->ramp_size,
temp, gamma);
/* Set new gamma ramps */
r = XF86VidModeSetGammaRamp(state->display, state->screen_num,
ramp_size, gamma_r, gamma_g, gamma_b);
state->ramp_size, gamma_r, gamma_g,
gamma_b);
if (!r) {
fprintf(stderr, "XF86VidModeSetGammaRamp failed.\n");
free(gamma_ramps);
src/vidmode.h
+2
View File
@@ -25,6 +25,8 @@
typedef struct {
Display *display;
int screen_num;
int ramp_size;
uint16_t *saved_ramps;
} vidmode_state_t;
int vidmode_init(vidmode_state_t *state, int screen_num);