Fix T69060: File Output Node does not work with Time Remapping

Problem is that the RenderEngines will change the RenderData cfra when
rendering (when time remapping is used -- at least workbench/eevee/
gpencil do a combination of BKE_scene_frame_get() plus
RE_GetCameraWindow() which alters the RenderData cfra).

Later on in the pipeline, the Compositor will use this RenderData cfra
to determine the output file name for the FileOutput node. (In contrast
to this, the 'regular' Output will use the Scene's RenderData -- not the
Render's -- cfra [which hasnt been altered])

It is not entirely clear why RE_GetCameraWindow was setting the cfra on
the Render, but it appears to be legacy OGL rendering related and is not
needed anymore.
Removing this will keep the cfra as needed for the Compositor FileOutput
node.

source/blender/draw/engines/eevee/eevee_render.c

@@ -135,9 +135,8 @@ bool EEVEE_render_init(EEVEE_Data *ved, RenderEngine *engine, struct Depsgraph *
   float winmat[4][4], viewmat[4][4], viewinv[4][4];
   /* TODO(sergey): Shall render hold pointer to an evaluated camera instead? */
   struct Object *ob_camera_eval = DEG_get_evaluated_object(depsgraph, RE_GetCamera(engine->re));
-  float frame = BKE_scene_frame_get(scene);
 
-  RE_GetCameraWindow(engine->re, ob_camera_eval, frame, winmat);
+  RE_GetCameraWindow(engine->re, ob_camera_eval, winmat);
   RE_GetCameraWindowWithOverscan(engine->re, winmat, g_data->overscan);
   RE_GetCameraModelMatrix(engine->re, ob_camera_eval, viewinv);
 

source/blender/draw/engines/gpencil/gpencil_render.c

@@ -51,8 +51,7 @@ void GPENCIL_render_init(GPENCIL_Data *vedata,
   float winmat[4][4], viewmat[4][4], viewinv[4][4];
 
   struct Object *camera = DEG_get_evaluated_object(depsgraph, RE_GetCamera(engine->re));
-  float frame = BKE_scene_frame_get(scene);
-  RE_GetCameraWindow(engine->re, camera, frame, winmat);
+  RE_GetCameraWindow(engine->re, camera, winmat);
   RE_GetCameraModelMatrix(engine->re, camera, viewinv);
 
   invert_m4_m4(viewmat, viewinv);

source/blender/draw/engines/workbench/workbench_render.c

@@ -52,14 +52,12 @@ static void workbench_render_cache(void *vedata,
 static void workbench_render_matrices_init(RenderEngine *engine, Depsgraph *depsgraph)
 {
   /* TODO(sergey): Shall render hold pointer to an evaluated camera instead? */
-  Scene *scene = DEG_get_evaluated_scene(depsgraph);
   struct Object *ob_camera_eval = DEG_get_evaluated_object(depsgraph, RE_GetCamera(engine->re));
-  float frame = BKE_scene_frame_get(scene);
 
   /* Set the persective, view and window matrix. */
   float winmat[4][4], viewmat[4][4], viewinv[4][4];
 
-  RE_GetCameraWindow(engine->re, ob_camera_eval, frame, winmat);
+  RE_GetCameraWindow(engine->re, ob_camera_eval, winmat);
   RE_GetCameraModelMatrix(engine->re, ob_camera_eval, viewinv);
 
   invert_m4_m4(viewmat, viewinv);

source/blender/render/extern/include/RE_pipeline.h

@@ -363,7 +363,7 @@ struct RenderPass *RE_pass_find_by_type(volatile struct RenderLayer *rl,
 #define RE_BAKE_DISPLACEMENT 1
 #define RE_BAKE_AO 2
 
-void RE_GetCameraWindow(struct Render *re, struct Object *camera, int frame, float mat[4][4]);
+void RE_GetCameraWindow(struct Render *re, struct Object *camera, float mat[4][4]);
 void RE_GetCameraWindowWithOverscan(struct Render *re, float mat[4][4], float overscan);
 void RE_GetCameraModelMatrix(struct Render *re, struct Object *camera, float r_mat[4][4]);
 struct Scene *RE_GetScene(struct Render *re);

source/blender/render/intern/source/initrender.c

@@ -211,9 +211,8 @@ void RE_SetCamera(Render *re, Object *cam_ob)
   re_camera_params_get(re, &params);
 }
 
-void RE_GetCameraWindow(struct Render *re, struct Object *camera, int frame, float mat[4][4])
+void RE_GetCameraWindow(struct Render *re, struct Object *camera, float mat[4][4])
 {
-  re->r.cfra = frame;
   RE_SetCamera(re, camera);
   copy_m4_m4(mat, re->winmat);
 }