ecore-drm2: Add API function to return supported rotations of an output

Small patch to add an API function which can be used to return the
supported rotations of a given output. This is used inside the
Enlightenment wl_drm module to determine if rotations is supported on
an output.

@feature

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/lib/ecore_drm2/Ecore_Drm2.h

@@ -742,6 +742,21 @@ EAPI Eina_Bool ecore_drm2_output_possible_crtc_get(Ecore_Drm2_Output *output, un
  */
 EAPI void ecore_drm2_output_gamma_set(Ecore_Drm2_Output *output, uint16_t size, uint16_t *red, uint16_t *green, uint16_t *blue);
 
+/**
+ * Get the supported rotations of a given output
+ *
+ * @param output
+ *
+ * @return An integer representing possible rotations, or -1 on failure
+ *
+ * @note This function will only return valid values if Atomic support
+ *       is enabled as it requires hardware plane support.
+ *
+ * @ingroup Ecore_Drm2_Output_Group
+ * @since 1.19
+ */
+EAPI int ecore_drm2_output_supported_rotations_get(Ecore_Drm2_Output *output);
+
 /**
  * @defgroup Ecore_Drm2_Fb_Group Drm framebuffer functions
  *

src/lib/ecore_drm2/ecore_drm2_device.c

@@ -454,6 +454,7 @@ _drm2_atomic_state_plane_fill(Ecore_Drm2_Plane_State *pstate, int fd)
                {
                   int r = -1;
 
+                  DBG("\t\t\tRotation: %s", prop->enums[k].name);
                   if (!strcmp(prop->enums[k].name, "rotate-0"))
                     r = ECORE_DRM2_ROTATION_NORMAL;
                   else if (!strcmp(prop->enums[k].name, "rotate-90"))

src/lib/ecore_drm2/ecore_drm2_outputs.c

@@ -1514,3 +1514,18 @@ ecore_drm2_output_gamma_set(Ecore_Drm2_Output *output, uint16_t size, uint16_t *
                                red, green, blue) < 0)
      ERR("Failed to set gamma for Output %s: %m", output->name);
 }
+
+EAPI int
+ecore_drm2_output_supported_rotations_get(Ecore_Drm2_Output *output)
+{
+   int ret = -1;
+
+   EINA_SAFETY_ON_NULL_RETURN_VAL(output, -1);
+
+#ifdef HAVE_ATOMIC_DRM
+   if (_ecore_drm2_use_atomic)
+     ret = output->plane_state->supported_rotations;
+#endif
+
+   return ret;
+}