X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Fgame_sp%2FDDSpriteBuffer.c;h=7572c919d2e415d6d8e0aecd4c89ba21af02da79;hb=572a4bab20b6f36ef1a4782094b27ac5a703a476;hp=e7412265cfde796c41926c6280793321eef035cd;hpb=70e95507923cc6cfb20d9e9a74e8f5cc5f6e44de;p=rocksndiamonds.git

diff --git a/src/game_sp/DDSpriteBuffer.c b/src/game_sp/DDSpriteBuffer.c
index e7412265..7572c919 100644
--- a/src/game_sp/DDSpriteBuffer.c
+++ b/src/game_sp/DDSpriteBuffer.c
@@ -177,13 +177,109 @@ static void Blt(int pX, int pY, int SpriteX, int SpriteY)
   long Tmp;
 #endif
 
+  int sx1 = mScrollX - TILEX;
+  int sy1 = mScrollY - TILEY;
+  int sx2 = mScrollX + SXSIZE + TILEX;
+  int sy2 = mScrollY + SYSIZE + TILEY;
+  int x1 = sx1 / TILEX;
+  int y1 = sy1 / TILEY;
+  int x2 = sx2 / TILEX;
+  int y2 = sy2 / TILEY;
+
+  int sx = pX - x1 * TILEX;
+  int sy = pY - y1 * TILEY;
+
+#if 0
+  printf(":1: DDSpriteBuffer.c: Blt(): %d, %d [%ld, %ld]\n",
+	 pX, pY, mScrollX, mScrollY);
+#endif
+
+  if (NoDisplayFlag)
+    return;
+
+  /* do not draw fields that are outside the visible screen area */
+  if (pX < sx1 || pX >= sx2 || pY < sy1 || pY >= sy2)
+    return;
+
+#if 0
+  printf(":2: DDSpriteBuffer.c: Blt(): %d, %d [%ld, %ld]\n",
+	 pX, pY, mScrollX, mScrollY);
+#endif
+
+  {
+    DR.left = pX + mDestXOff;
+    DR.top = pY + mDestYOff;
+    DR.right = pX + mSpriteWidth + mDestXOff;
+    DR.bottom = pY + mSpriteHeight + mDestYOff;
+  }
+  {
+    SR.left = mSpriteWidth * (SpriteX - 1);
+    SR.top = mSpriteHeight * (SpriteY - 1);
+    SR.right = SR.left + mSpriteWidth;
+    SR.bottom = SR.top + mSpriteHeight;
+  }
+
+#if 0
+  printf("::: DDSpriteBuffer.c: Blt(): %d, %d\n", DR.left, DR.top);
+#endif
+
+#if 0
+  if (pX == 0 * StretchWidth && pY == 0 * StretchWidth)
+    printf("::: TEST: drawing topleft corner ...\n");
+  if (pX == 59 * StretchWidth && pY == 23 * StretchWidth)
+    printf("::: TEST: drawing bottomright corner ...\n");
+#endif
+
+#if 1
+
+#if 1
+  BlitBitmap(sp_objects, screenBitmap,
+	     SR.left, SR.top,
+	     mSpriteWidth, mSpriteHeight,
+	     sx, sy);
+#else
+  BlitBitmap(sp_objects, screenBitmap,
+	     SR.left, SR.top,
+	     mSpriteWidth, mSpriteHeight,
+	     DR.left, DR.top);
+#endif
+
+#else
+  Tmp = mDest.Blt(DR, &Buffer, SR, DDBLT_WAIT);
+#endif
+}
+
+static void OLD_Blt(int pX, int pY, int SpriteX, int SpriteY)
+{
+  RECT DR, SR;
+#if 0
+  long Tmp;
+#endif
+
+#if 1
+  int left = mScrollX;
+  int top  = mScrollY;
+#else
+  int left = mScrollX / TILEX;
+  int top  = mScrollY / TILEY;
+#endif
+
+  int sx = pX % (MAX_BUF_XSIZE * TILEX);
+  int sy = pY % (MAX_BUF_YSIZE * TILEY);
+
 #if 0
-  printf("::: DDSpriteBuffer.c: Blt(): %d, %d\n", pX, pY);
+  printf("::: DDSpriteBuffer.c: Blt(): %d, %d [%ld, %ld] [%d, %d]\n",
+	 pX, pY, mScrollX, mScrollY, left, top);
 #endif
 
   if (NoDisplayFlag)
     return;
 
+  /* do not draw fields that are outside the visible screen area */
+  if (pX < left || pX >= left + MAX_BUF_XSIZE * TILEX ||
+      pY < top  || pY >= top  + MAX_BUF_YSIZE * TILEY)
+    return;
+
   {
     DR.left = pX + mDestXOff;
     DR.top = pY + mDestYOff;
@@ -208,11 +304,20 @@ static void Blt(int pX, int pY, int SpriteX, int SpriteY)
     printf("::: TEST: drawing bottomright corner ...\n");
 #endif
 
+#if 1
+
 #if 1
+  BlitBitmap(sp_objects, screenBitmap,
+	     SR.left, SR.top,
+	     mSpriteWidth, mSpriteHeight,
+	     sx, sy);
+#else
   BlitBitmap(sp_objects, screenBitmap,
 	     SR.left, SR.top,
 	     mSpriteWidth, mSpriteHeight,
 	     DR.left, DR.top);
+#endif
+
 #else
   Tmp = mDest.Blt(DR, &Buffer, SR, DDBLT_WAIT);
 #endif
@@ -227,6 +332,7 @@ void DDSpriteBuffer_BltEx(int pX, int pY, int SpritePos)
 
   XPos = (SpritePos % mXSpriteCount) + 1;
   YPos = (SpritePos / mXSpriteCount) + 1;
+
   Blt(pX, pY, XPos, YPos);
 }