wined3d: Make the context parameter to the get_drawable_size() callback const.

dlls/wined3d/device.c

@@ -6185,16 +6185,16 @@ void device_invalidate_state(const struct wined3d_device *device, DWORD state)
     }
 }
 
-void get_drawable_size_fbo(struct wined3d_context *context, UINT *width, UINT *height)
+void get_drawable_size_fbo(const struct wined3d_context *context, UINT *width, UINT *height)
 {
     /* The drawable size of a fbo target is the opengl texture size, which is the power of two size. */
     *width = context->current_rt->pow2Width;
     *height = context->current_rt->pow2Height;
 }
 
-void get_drawable_size_backbuffer(struct wined3d_context *context, UINT *width, UINT *height)
+void get_drawable_size_backbuffer(const struct wined3d_context *context, UINT *width, UINT *height)
 {
-    struct wined3d_swapchain *swapchain = context->swapchain;
+    const struct wined3d_swapchain *swapchain = context->swapchain;
     /* The drawable size of a backbuffer / aux buffer offscreen target is the size of the
      * current context's drawable, which is the size of the back buffer of the swapchain
      * the active context belongs to. */

dlls/wined3d/swapchain.c

@@ -1190,7 +1190,7 @@ struct wined3d_context *swapchain_get_context(struct wined3d_swapchain *swapchai
     return swapchain_create_context(swapchain);
 }
 
-void get_drawable_size_swapchain(struct wined3d_context *context, UINT *width, UINT *height)
+void get_drawable_size_swapchain(const struct wined3d_context *context, UINT *width, UINT *height)
 {
     /* The drawable size of an onscreen drawable is the surface size.
      * (Actually: The window size, but the surface is created in window size) */

dlls/wined3d/wined3d_private.h

@@ -2011,7 +2011,7 @@ struct wined3d_surface
     UINT                      pow2Height;
 
     /* A method to retrieve the drawable size. Not in the Vtable to make it changeable */
-    void (*get_drawable_size)(struct wined3d_context *context, UINT *width, UINT *height);
+    void (*get_drawable_size)(const struct wined3d_context *context, UINT *width, UINT *height);
 
     /* PBO */
     GLuint                    pbo;
@@ -2090,9 +2090,9 @@ void surface_upload_data(struct wined3d_surface *surface, const struct wined3d_g
         const struct wined3d_format *format, const RECT *src_rect, UINT src_w, const POINT *dst_point,
         BOOL srgb, const struct wined3d_bo_address *data) DECLSPEC_HIDDEN;
 
-void get_drawable_size_swapchain(struct wined3d_context *context, UINT *width, UINT *height) DECLSPEC_HIDDEN;
-void get_drawable_size_backbuffer(struct wined3d_context *context, UINT *width, UINT *height) DECLSPEC_HIDDEN;
-void get_drawable_size_fbo(struct wined3d_context *context, UINT *width, UINT *height) DECLSPEC_HIDDEN;
+void get_drawable_size_swapchain(const struct wined3d_context *context, UINT *width, UINT *height) DECLSPEC_HIDDEN;
+void get_drawable_size_backbuffer(const struct wined3d_context *context, UINT *width, UINT *height) DECLSPEC_HIDDEN;
+void get_drawable_size_fbo(const struct wined3d_context *context, UINT *width, UINT *height) DECLSPEC_HIDDEN;
 
 void draw_textured_quad(struct wined3d_surface *src_surface, const RECT *src_rect,
                         const RECT *dst_rect, WINED3DTEXTUREFILTERTYPE Filter) DECLSPEC_HIDDEN;