X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Flibgame%2Fsystem.c;h=dce2b888943693f787fb882b19dd4a20dd9413e3;hb=97baecdfcf386d972f6f8e6eec9ddfd3021ed7ed;hp=e67cbaeb80c1701f879022671243aaf716f64115;hpb=76c6cf34f934b80bcd42ed1f0940c6c56ac1c209;p=rocksndiamonds.git

diff --git a/src/libgame/system.c b/src/libgame/system.c
index e67cbaeb..dce2b888 100644
--- a/src/libgame/system.c
+++ b/src/libgame/system.c
@@ -211,6 +211,15 @@ void InitGfxScrollbufferInfo(int scrollbuffer_width, int scrollbuffer_height)
   gfx.scrollbuffer_height = scrollbuffer_height;
 }
 
+void InitGfxClipRegion(boolean enabled, int x, int y, int width, int height)
+{
+  gfx.clipping_enabled = enabled;
+  gfx.clip_x = x;
+  gfx.clip_y = y;
+  gfx.clip_width = width;
+  gfx.clip_height = height;
+}
+
 void InitGfxDrawBusyAnimFunction(void (*draw_busy_anim_function)(void))
 {
   gfx.draw_busy_anim_function = draw_busy_anim_function;
@@ -235,6 +244,8 @@ void SetDrawBackgroundMask(int draw_background_mask)
   gfx.draw_background_mask = draw_background_mask;
 }
 
+#if 0
+
 static void DrawBitmapFromTile(Bitmap *bitmap, Bitmap *tile,
 			       int dest_x, int dest_y, int width, int height)
 {
@@ -291,6 +302,39 @@ void SetBackgroundBitmap(Bitmap *background_bitmap_tile, int mask)
   }
 }
 
+#else
+
+void SetBackgroundBitmap(Bitmap *background_bitmap_tile, int mask)
+{
+  if (background_bitmap_tile != NULL)
+    gfx.background_bitmap_mask |= mask;
+  else
+    gfx.background_bitmap_mask &= ~mask;
+
+#if 0
+  if (gfx.background_bitmap == NULL)
+    gfx.background_bitmap = CreateBitmap(video.width, video.height,
+					 DEFAULT_DEPTH);
+#endif
+
+  if (background_bitmap_tile == NULL)	/* empty background requested */
+    return;
+
+  if (mask == REDRAW_ALL)
+    BlitBitmapTiled(background_bitmap_tile, gfx.background_bitmap, 0, 0, 0, 0,
+		    0, 0, video.width, video.height);
+  else if (mask == REDRAW_FIELD)
+    BlitBitmapTiled(background_bitmap_tile, gfx.background_bitmap, 0, 0, 0, 0,
+		    gfx.real_sx, gfx.real_sy, gfx.full_sxsize, gfx.full_sysize);
+  else if (mask == REDRAW_DOOR_1)
+  {
+    BlitBitmapTiled(background_bitmap_tile, gfx.background_bitmap, 0, 0, 0, 0,
+		    gfx.dx, gfx.dy, gfx.dxsize, gfx.dysize);
+  }
+}
+
+#endif
+
 void SetWindowBackgroundBitmap(Bitmap *background_bitmap_tile)
 {
   /* remove every mask before setting mask for window */
@@ -512,9 +556,61 @@ boolean DrawingOnBackground(int x, int y)
 	  CheckDrawingArea(x, y, 1, 1, gfx.draw_background_mask));
 }
 
-static boolean ValidClippedRectangle(Bitmap *bitmap, int *x, int *y,
-				     int *width, int *height)
+static boolean InClippedRectangle(Bitmap *bitmap, int *x, int *y,
+				  int *width, int *height, boolean is_dest)
 {
+#if 1
+  int clip_x, clip_y, clip_width, clip_height;
+
+  if (gfx.clipping_enabled && is_dest)	/* only clip destination bitmap */
+  {
+    clip_x = MIN(MAX(0, gfx.clip_x), bitmap->width);
+    clip_y = MIN(MAX(0, gfx.clip_y), bitmap->height);
+    clip_width = MIN(MAX(0, gfx.clip_width), bitmap->width - clip_x);
+    clip_height = MIN(MAX(0, gfx.clip_height), bitmap->height - clip_y);
+  }
+  else
+  {
+    clip_x = 0;
+    clip_y = 0;
+    clip_width = bitmap->width;
+    clip_height = bitmap->height;
+  }
+
+  /* skip if rectangle completely outside bitmap */
+
+  if (*x + *width  <= clip_x ||
+      *y + *height <= clip_y ||
+      *x >= clip_x + clip_width ||
+      *y >= clip_y + clip_height)
+    return FALSE;
+
+  /* clip if rectangle overlaps bitmap */
+
+  if (*x < clip_x)
+  {
+    *width -= clip_x - *x;
+    *x = clip_x;
+  }
+  else if (*x + *width > clip_x + clip_width)
+  {
+    *width = clip_x + clip_width - *x;
+  }
+
+  if (*y < clip_y)
+  {
+    *height -= clip_y - *y;
+    *y = clip_y;
+  }
+  else if (*y + *height > clip_y + clip_height)
+  {
+    *height = clip_y + clip_height - *y;
+  }
+
+  return TRUE;
+
+#else
+
   /* skip if rectangle completely outside bitmap */
 
   if (*x + *width <= 0 ||
@@ -546,6 +642,7 @@ static boolean ValidClippedRectangle(Bitmap *bitmap, int *x, int *y,
   }
 
   return TRUE;
+#endif
 }
 
 void BlitBitmap(Bitmap *src_bitmap, Bitmap *dst_bitmap,
@@ -559,8 +656,8 @@ void BlitBitmap(Bitmap *src_bitmap, Bitmap *dst_bitmap,
     return;
 
 #if 1
-  if (!ValidClippedRectangle(src_bitmap, &src_x, &src_y, &width, &height) ||
-      !ValidClippedRectangle(dst_bitmap, &dst_x, &dst_y, &width, &height))
+  if (!InClippedRectangle(src_bitmap, &src_x, &src_y, &width, &height, FALSE) ||
+      !InClippedRectangle(dst_bitmap, &dst_x, &dst_y, &width, &height, TRUE))
     return;
 
   /* source x/y might need adjustment if destination x/y was clipped top/left */
@@ -639,17 +736,50 @@ void BlitBitmap(Bitmap *src_bitmap, Bitmap *dst_bitmap,
 #endif
 #endif
 
+#if 0
+  if (dst_x < gfx.sx + gfx.sxsize)
+    printf("::: %d: BlitBitmap(%d, %d, %d, %d)\n",
+	   FrameCounter, dst_x, dst_y, width, height);
+#endif
+
   sysCopyArea(src_bitmap, dst_bitmap,
 	      src_x, src_y, width, height, dst_x, dst_y, BLIT_OPAQUE);
 }
 
+void BlitBitmapTiled(Bitmap *src_bitmap, Bitmap *dst_bitmap,
+		     int src_x, int src_y, int src_width, int src_height,
+		     int dst_x, int dst_y, int dst_width, int dst_height)
+{
+  int src_xsize = (src_width  == 0 ? src_bitmap->width  : src_width);
+  int src_ysize = (src_height == 0 ? src_bitmap->height : src_height);
+  int dst_xsize = dst_width;
+  int dst_ysize = dst_height;
+  int src_xsteps = (dst_xsize + src_xsize - 1) / src_xsize;
+  int src_ysteps = (dst_ysize + src_ysize - 1) / src_ysize;
+  int x, y;
+
+  for (y = 0; y < src_ysteps; y++)
+  {
+    for (x = 0; x < src_xsteps; x++)
+    {
+      int draw_x = dst_x + x * src_xsize;
+      int draw_y = dst_y + y * src_ysize;
+      int draw_xsize = MIN(src_xsize, dst_xsize - x * src_xsize);
+      int draw_ysize = MIN(src_ysize, dst_ysize - y * src_ysize);
+
+      BlitBitmap(src_bitmap, dst_bitmap, src_x, src_y, draw_xsize, draw_ysize,
+		 draw_x, draw_y);
+    }
+  }
+}
+
 void FadeRectangle(Bitmap *bitmap_cross, int x, int y, int width, int height,
 		   int fade_mode, int fade_delay, int post_delay,
 		   void (*draw_border_function)(void))
 {
 #if 1
-  /* (use bitmap "backbuffer" -- "bitmap_cross" may be undefined) */
-  if (!ValidClippedRectangle(backbuffer, &x, &y, &width, &height))
+  /* (use destination bitmap "backbuffer" -- "bitmap_cross" may be undefined) */
+  if (!InClippedRectangle(backbuffer, &x, &y, &width, &height, TRUE))
     return;
 #endif
 
@@ -669,7 +799,7 @@ void FillRectangle(Bitmap *bitmap, int x, int y, int width, int height,
     return;
 
 #if 1
-  if (!ValidClippedRectangle(bitmap, &x, &y, &width, &height))
+  if (!InClippedRectangle(bitmap, &x, &y, &width, &height, TRUE))
     return;
 #else
   /* skip if rectangle starts outside bitmap */