From: Holger Schemel <info@artsoft.org>
Date: Sat, 6 Aug 2022 09:08:45 +0000 (+0200)
Subject: added alpha channel for anti-aliasing to element collecting image
X-Git-Tag: 4.3.3.0~74
X-Git-Url: https://git.artsoft.org/?a=commitdiff_plain;h=b137e7481391c30c99dc23abea8762a0bbeac1e3;p=rocksndiamonds.git

added alpha channel for anti-aliasing to element collecting image
---

diff --git a/graphics/gfx_classic/RocksCollect.png b/graphics/gfx_classic/RocksCollect.png
index 0f5a1dfc..710c556c 100644
Binary files a/graphics/gfx_classic/RocksCollect.png and b/graphics/gfx_classic/RocksCollect.png differ
diff --git a/src/files.c b/src/files.c
index 1d8ba026..09e3b4d2 100644
--- a/src/files.c
+++ b/src/files.c
@@ -13466,6 +13466,13 @@ void CreateCollectElementImages(void)
 	   filename_bmp,
 	   filename_png);
 
+  // force using RGBA surface for destination bitmap
+  SDL_SetColorKey(dst_bitmap->surface, SET_TRANSPARENT_PIXEL,
+		  SDL_MapRGB(dst_bitmap->surface->format, 0x00, 0x00, 0x00));
+
+  dst_bitmap->surface =
+    SDL_ConvertSurfaceFormat(dst_bitmap->surface, SDL_PIXELFORMAT_RGBA32, 0);
+
   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
   {
     if (!createCollectImage(i))
@@ -13486,6 +13493,13 @@ void CreateCollectElementImages(void)
     BlitBitmap(src_bitmap, tmp_bitmap, src_x, src_y,
 	       tile_size, tile_size, 0, 0);
 
+    // force using RGBA surface for temporary bitmap (using transparent black)
+    SDL_SetColorKey(tmp_bitmap->surface, SET_TRANSPARENT_PIXEL,
+		    SDL_MapRGB(tmp_bitmap->surface->format, 0x00, 0x00, 0x00));
+
+    tmp_bitmap->surface =
+      SDL_ConvertSurfaceFormat(tmp_bitmap->surface, SDL_PIXELFORMAT_RGBA32, 0);
+
     tmp_bitmap->surface_masked = tmp_bitmap->surface;
 
     for (j = 0; j < anim_frames; j++)
@@ -13506,9 +13520,9 @@ void CreateCollectElementImages(void)
 	frame_bitmap = half_bitmap;
       }
 
-      BlitBitmap(frame_bitmap, dst_bitmap, 0, 0,
-		 frame_size_final, frame_size_final,
-		 dst_x + j * tile_size + offset, dst_y + offset);
+      BlitBitmapMasked(frame_bitmap, dst_bitmap, 0, 0,
+		       frame_size_final, frame_size_final,
+		       dst_x + j * tile_size + offset, dst_y + offset);
 
       FreeBitmap(frame_bitmap);
     }