From: Holger Schemel <info@artsoft.org>
Date: Sun, 19 Nov 2023 13:23:27 +0000 (+0100)
Subject: added support for fading in and fading out global animations
X-Git-Tag: 4.3.8.0~37
X-Git-Url: https://git.artsoft.org/?a=commitdiff_plain;h=9d401c32427061d43bfc14d72fe4a9df90490b7d;p=rocksndiamonds.git

added support for fading in and fading out global animations

To fade global animations in or out, use the attribute ".fade_mode"
with value "fade_in" or "fade_out" and the attribute ".fade_delay"
with the number of video frames to use for fading in or out. (Note
that this attribute expects frames when used with global animations,
while it expects milliseconds when used with screens and menus.)
---

diff --git a/src/anim.c b/src/anim.c
index 5967bb73..6d761f43 100644
--- a/src/anim.c
+++ b/src/anim.c
@@ -137,6 +137,9 @@ struct GlobalAnimPartControlInfo
   int anim_delay_counter;
   int post_delay_counter;
 
+  int fade_delay_counter;
+  int fade_alpha;
+
   boolean init_event_state;
   boolean anim_event_state;
 
@@ -735,6 +738,7 @@ static void BlitGlobalAnimation(struct GlobalAnimPartControlInfo *part,
   Bitmap *fade_bitmap =
     (drawing_target == DRAW_TO_FADE_SOURCE ? gfx.fade_bitmap_source :
      drawing_target == DRAW_TO_FADE_TARGET ? gfx.fade_bitmap_target : NULL);
+  int alpha = (c->fade_mode & FADE_MODE_FADE ? part->fade_alpha : g->alpha);
   int x, y;
 
   for (y = 0; y < c->stacked_yfactor; y++)
@@ -781,7 +785,7 @@ static void BlitGlobalAnimation(struct GlobalAnimPartControlInfo *part,
       dst_x += part->viewport_x;
       dst_y += part->viewport_y;
 
-      SetBitmapAlphaNextBlit(src_bitmap, g->alpha);
+      SetBitmapAlphaNextBlit(src_bitmap, alpha);
 
       if (drawing_target == DRAW_TO_SCREEN)
 	blit_screen(src_bitmap, src_x, src_y, width, height,
@@ -1537,6 +1541,7 @@ static int HandleGlobalAnim_Part(struct GlobalAnimPartControlInfo *part,
   struct GraphicInfo *g = &part->graphic_info;
   struct GraphicInfo *c = &part->control_info;
   boolean viewport_changed = SetGlobalAnimPart_Viewport(part);
+  int alpha = (g->alpha != -1 ? g->alpha : SDL_ALPHA_OPAQUE);
 
   // if game is paused, also pause playfield and door animations
   if (isPausedOnPlayfieldOrDoor(part))
@@ -1573,6 +1578,18 @@ static int HandleGlobalAnim_Part(struct GlobalAnimPartControlInfo *part,
     if (part->anim_random_frame == -1)
       part->anim_random_frame = GetSimpleRandom(g->anim_frames);
 
+    if (c->fade_mode & FADE_MODE_FADE)
+    {
+      // when fading in screen, first frame is 100 % transparent or opaque
+      part->fade_delay_counter = c->fade_delay + 1;
+      part->fade_alpha = (c->fade_mode == FADE_MODE_FADE_IN ? 0 : alpha);
+    }
+    else
+    {
+      part->fade_delay_counter = 0;
+      part->fade_alpha = -1;
+    }
+
     if (c->direction & MV_HORIZONTAL)
     {
       int pos_bottom = part->viewport_height - g->height;
@@ -1786,6 +1803,14 @@ static int HandleGlobalAnim_Part(struct GlobalAnimPartControlInfo *part,
     return ANIM_STATE_WAITING;
   }
 
+  if (part->fade_delay_counter > 0)
+  {
+    part->fade_delay_counter--;
+    part->fade_alpha = alpha * (c->fade_mode == FADE_MODE_FADE_IN ?
+				c->fade_delay - part->fade_delay_counter :
+				part->fade_delay_counter) / c->fade_delay;
+  }
+
   // special case to prevent expiring loop sounds when playing
   PlayGlobalAnimSoundIfLoop(part);
 
diff --git a/src/files.c b/src/files.c
index 1514d4e6..c4881f64 100644
--- a/src/files.c
+++ b/src/files.c
@@ -11925,6 +11925,8 @@ int get_parameter_value(char *value_raw, char *suffix, int type)
   {
     result = (string_has_parameter(value, "none")	? FADE_MODE_NONE :
 	      string_has_parameter(value, "fade")	? FADE_MODE_FADE :
+	      string_has_parameter(value, "fade_in")	? FADE_MODE_FADE_IN :
+	      string_has_parameter(value, "fade_out")	? FADE_MODE_FADE_OUT :
 	      string_has_parameter(value, "crossfade")	? FADE_MODE_CROSSFADE :
 	      string_has_parameter(value, "melt")	? FADE_MODE_MELT :
 	      string_has_parameter(value, "curtain")	? FADE_MODE_CURTAIN :