Mir: Add gamma support set/get. Still need one more function to complete the set

src/video/mir/SDL_mirsym.h

@@ -115,6 +115,10 @@ SDL_MIR_SYM(MirOutputMode const*,mir_output_get_mode,(MirOutput const* output, s
 SDL_MIR_SYM(int,mir_output_mode_get_width,(MirOutputMode const* mode))
 SDL_MIR_SYM(int,mir_output_mode_get_height,(MirOutputMode const* mode))
 SDL_MIR_SYM(double,mir_output_mode_get_refresh_rate,(MirOutputMode const* mode))
+SDL_MIR_SYM(MirOutputGammaSupported,mir_output_is_gamma_supported,(MirOutput const* output))
+SDL_MIR_SYM(uint32_t,mir_output_get_gamma_size,(MirOutput const* output))
+SDL_MIR_SYM(void,mir_output_get_gamma,(MirOutput const* output, uint16_t* red, uint16_t* green, uint16_t* blue, uint32_t size))
+SDL_MIR_SYM(void,mir_output_set_gamma,(MirOutput* output, uint16_t const* red, uint16_t const* green, uint16_t const* blue, uint32_t size))
 
 SDL_MIR_SYM_CONST(char const*,mir_omnidirectional_resize_cursor_name)
 SDL_MIR_SYM_CONST(char const*,mir_busy_cursor_name)

src/video/mir/SDL_mirvideo.c

@@ -179,13 +179,13 @@ MIR_CreateDevice(int device_index)
     device->SetWindowMaximumSize = MIR_SetWindowMaximumSize;
     device->SetWindowTitle       = MIR_SetWindowTitle;
     device->SetWindowGrab        = MIR_SetWindowGrab;
+    device->SetWindowGammaRamp   = MIR_SetWindowGammaRamp;
+    device->GetWindowGammaRamp   = MIR_GetWindowGammaRamp;
 
     device->CreateWindowFrom     = NULL;
     device->SetWindowIcon        = NULL;
     device->RaiseWindow          = NULL;
     device->SetWindowBordered    = NULL;
-    device->SetWindowGammaRamp   = NULL;
-    device->GetWindowGammaRamp   = NULL;
     device->OnWindowEnter        = NULL;
     device->SetWindowPosition    = NULL;
 

src/video/mir/SDL_mirwindow.c

@@ -376,7 +376,45 @@ MIR_SetWindowGrab(_THIS, SDL_Window* window, SDL_bool grabbed)
 
     MIR_mir_surface_apply_spec(mir_window->surface, spec);
     MIR_mir_surface_spec_release(spec);
+}
+
+int
+MIR_SetWindowGammaRamp(_THIS, SDL_Window* window, Uint16 const* ramp)
+{
+    MirOutput* output = SDL_GetDisplayForWindow(window)->driverdata;
+    Uint32 ramp_size = 256;
+
+    // FIXME Need to apply the changes to the output, once that public API function is around
+    if (MIR_mir_output_is_gamma_supported(output) == mir_output_gamma_supported) {
+        MIR_mir_output_set_gamma(output,
+                                 ramp + ramp_size * 0,
+                                 ramp + ramp_size * 1,
+                                 ramp + ramp_size * 2,
+                                 ramp_size);
+        return 0;
+    }
+
+    return -1;
+}
+
+int
+MIR_GetWindowGammaRamp(_THIS, SDL_Window* window, Uint16* ramp)
+{
+    MirOutput* output = SDL_GetDisplayForWindow(window)->driverdata;
+    Uint32 ramp_size = 256;
+
+    if (MIR_mir_output_is_gamma_supported(output) == mir_output_gamma_supported) {
+        if (MIR_mir_output_get_gamma_size(output) == ramp_size) {
+            MIR_mir_output_get_gamma(output,
+                                     ramp + ramp_size * 0,
+                                     ramp + ramp_size * 1,
+                                     ramp + ramp_size * 2,
+                                     ramp_size);
+            return 0;
+        }
+    }
 
+    return -1;
 }
 
 #endif /* SDL_VIDEO_DRIVER_MIR */

src/video/mir/SDL_mirwindow.h

@@ -81,6 +81,11 @@ MIR_SetWindowTitle(_THIS, SDL_Window* window);
 extern void
 MIR_SetWindowGrab(_THIS, SDL_Window* window, SDL_bool grabbed);
 
+extern int
+MIR_SetWindowGammaRamp(_THIS, SDL_Window* window, Uint16 const* ramp);
+
+extern int
+MIR_GetWindowGammaRamp(_THIS, SDL_Window* window, Uint16* ramp);
 
 #endif /* _SDL_mirwindow_h */