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-rw-r--r--src/blueshift_vidmode_c.c68
1 files changed, 15 insertions, 53 deletions
diff --git a/src/blueshift_vidmode_c.c b/src/blueshift_vidmode_c.c
index fdc73ae..72c8053 100644
--- a/src/blueshift_vidmode_c.c
+++ b/src/blueshift_vidmode_c.c
@@ -44,14 +44,11 @@ static int curve_size;
* Start stage of colour curve control
*
* @param use_screen The screen to use
- * @return Zero on success
+ * @return Zero on error, otherwise the size of colours curves
*/
int blueshift_vidmode_open(int use_screen)
{
int _major, _minor;
- uint16_t* r_gamma;
- uint16_t* g_gamma;
- uint16_t* b_gamma;
/* Get X display */
@@ -59,7 +56,7 @@ int blueshift_vidmode_open(int use_screen)
if ((display = XOpenDisplay(NULL)) == NULL)
{
fprintf(stderr, "Cannot open X display\n");
- return 1;
+ return 0;
}
@@ -69,7 +66,7 @@ int blueshift_vidmode_open(int use_screen)
{
fprintf(stderr, "VidMode version query failed\n");
XCloseDisplay(display);
- return 1;
+ return 0;
}
@@ -80,37 +77,17 @@ int blueshift_vidmode_open(int use_screen)
{
fprintf(stderr, "VidMode gamma size query failed\n");
XCloseDisplay(display);
- return 1;
+ return 0;
}
- if (curve_size < 1)
+ if (curve_size <= 1)
{
- fprintf(stderr, "VidMode gamma size query failed\n");
+ fprintf(stderr, "VidMode gamma size query failed, impossible dimension\n");
XCloseDisplay(display);
- return 1;
+ return 0;
}
-
- /* Acquire curve control */
-
- r_gamma = malloc(3 * curve_size * sizeof(uint16_t));
- if (r_gamma == NULL)
- {
- fprintf(stderr, "Out of memory\n");
- return 1;
- }
- g_gamma = r_gamma + curve_size;
- b_gamma = g_gamma + curve_size;
- if (XF86VidModeGetGammaRamp(display, screen, curve_size, r_gamma, g_gamma, b_gamma) == 0)
- {
- fprintf(stderr, "VidMode gamma query failed\n");
- free(r_gamma);
- XCloseDisplay(display);
- return 1;
- }
- free(r_gamma);
-
- return 0;
+ return curve_size;
}
@@ -118,40 +95,25 @@ int blueshift_vidmode_open(int use_screen)
* Gets the current colour curves
*
* @param use_crtc The CRTC to use
- * @return {the size of the red curve, *the red curve,
- * the size of the green curve, *the green curve,
- * the size of the blue curve, *the blue curve},
- * needs to be free:d. `NULL` on error.
+ * @param r_gamma Storage location for the red colour curve
+ * @param g_gamma Storage location for the green colour curve
+ * @param b_gamma Storage location for the blue colour curve
+ * @return Zero on success
*/
-uint16_t* blueshift_vidmode_read(int use_crtc)
+int blueshift_vidmode_read(int use_crtc, uint16_t* r_gamma, uint16_t* g_gamma, uint16_t* b_gamma)
{
(void) use_crtc;
/* Read curves */
- uint16_t* r_gamma = malloc((3 + 3 * curve_size) * sizeof(uint16_t));
- uint16_t* g_gamma = r_gamma + curve_size + 1;
- uint16_t* b_gamma = g_gamma + curve_size + 1;
- if (r_gamma == NULL)
- {
- fprintf(stderr, "Out of memory\n");
- XCloseDisplay(display);
- return NULL;
- }
-
- *r_gamma++ = curve_size;
- *g_gamma++ = curve_size;
- *b_gamma++ = curve_size;
-
if (XF86VidModeGetGammaRamp(display, screen, curve_size, r_gamma, g_gamma, b_gamma) == 0)
{
fprintf(stderr, "VidMode gamma query failed\n");
- free(r_gamma);
XCloseDisplay(display);
- return NULL;
+ return 1;
}
- return r_gamma - 1;
+ return 0;
}