+#endif
+
+/* copy the entire screen to the window at the scroll position */
+
+void BlitScreenToBitmap_SP(Bitmap *target_bitmap)
+{
+#if 0
+ int px = 2 * TILEX + mScrollX % TILEX;
+ int py = 2 * TILEY + mScrollY % TILEY;
+#else
+ int px = 2 * TILEX + (mScrollX - mScrollX_last) % TILEX;
+ int py = 2 * TILEY + (mScrollY - mScrollY_last) % TILEY;
+#endif
+ int sx, sy, sxsize, sysize;
+
+#if 0
+ if (mScrollX % TILEX != (mScrollX - mScrollX_last) % TILEX ||
+ mScrollY % TILEY != (mScrollY - mScrollY_last) % TILEY)
+ printf("::: %ld, %ld / %ld, %ld\n",
+ mScrollX, mScrollY, mScrollX_last, mScrollY_last);
+#endif
+
+#if 1
+ int xsize = SXSIZE;
+ int ysize = SYSIZE;
+ int full_xsize = (FieldWidth - (menBorder.Checked ? 0 : 1)) * TILEX;
+ int full_ysize = (FieldHeight - (menBorder.Checked ? 0 : 1)) * TILEY;
+
+ sxsize = (full_xsize < xsize ? full_xsize : xsize);
+ sysize = (full_ysize < ysize ? full_ysize : ysize);
+ sx = SX + (full_xsize < xsize ? (xsize - full_xsize) / 2 : 0);
+ sy = SY + (full_ysize < ysize ? (ysize - full_ysize) / 2 : 0);
+#endif
+
+#if 0
+ {
+ static int mScrollX_tmp = -1;
+ static int mScrollY_tmp = -1;
+
+ if (mScrollX != mScrollX_tmp || mScrollY != mScrollY_tmp)
+ {
+ printf("::: %ld, %ld\n", mScrollX, mScrollY);
+
+ mScrollX_tmp = mScrollX;
+ mScrollY_tmp = mScrollY;
+ }
+ }
+#endif
+
+#if 0
+ {
+ static boolean x = 0;
+
+ if (x == 0)
+ {
+ printf("::: %d, %d (%d, %d) (%d, %d) [%ld, %ld] [%ld, %ld] \n",
+ sx, sy, xsize, ysize, full_xsize, full_ysize,
+ mScrollX, mScrollY, mScrollX_last, mScrollY_last);
+
+ x = 1;
+ }
+ }
+#endif
+
+#if 1
+ if (!menBorder.Checked)
+ {
+ px += TILEX / 2;
+ py += TILEY / 2;
+ }
+#endif
+
+#if 0
+ if (mScrollX >= 0 && mScrollX <= 16)
+ {
+ px -= mScrollX;
+ }
+#if 0
+ else if (mScrollX >= 352 && mScrollX <= 368)
+ {
+ px -= mScrollX;
+ }
+#endif
+ else if (mScrollX >= 16) // && mScrollX <= 352)
+ {
+ px -= TILEX / 2;
+ }
+#endif
+
+#if 0
+ /* !!! TEST ONLY !!! */
+ px = py = 0;
+ sx = sy = SX;
+#endif
+
+ BlitBitmap(screenBitmap, target_bitmap, px, py, sxsize, sysize, sx, sy);
+}
+
+void OLD_BlitScreenToBitmap_SP(Bitmap *target_bitmap)
+{
+ int x = mScrollX % (MAX_BUF_XSIZE * TILEX);
+ int y = mScrollY % (MAX_BUF_YSIZE * TILEY);
+
+ if (x < 2 * TILEX && y < 2 * TILEY)
+ {
+ BlitBitmap(screenBitmap, target_bitmap, x, y,
+ SCR_FIELDX * TILEX, SCR_FIELDY * TILEY, SX, SY);
+ }
+ else if (x < 2 * TILEX && y >= 2 * TILEY)
+ {
+ BlitBitmap(screenBitmap, target_bitmap, x, y,
+ SCR_FIELDX * TILEX, MAX_BUF_YSIZE * TILEY - y,
+ SX, SY);
+ BlitBitmap(screenBitmap, target_bitmap, x, 0,
+ SCR_FIELDX * TILEX, y - 2 * TILEY,
+ SX, SY + MAX_BUF_YSIZE * TILEY - y);
+ }
+ else if (x >= 2 * TILEX && y < 2 * TILEY)
+ {
+ BlitBitmap(screenBitmap, target_bitmap, x, y,
+ MAX_BUF_XSIZE * TILEX - x, SCR_FIELDY * TILEY,
+ SX, SY);
+ BlitBitmap(screenBitmap, target_bitmap, 0, y,
+ x - 2 * TILEX, SCR_FIELDY * TILEY,
+ SX + MAX_BUF_XSIZE * TILEX - x, SY);
+ }
+ else
+ {
+ BlitBitmap(screenBitmap, target_bitmap, x, y,
+ MAX_BUF_XSIZE * TILEX - x, MAX_BUF_YSIZE * TILEY - y,
+ SX, SY);
+ BlitBitmap(screenBitmap, target_bitmap, 0, y,
+ x - 2 * TILEX, MAX_BUF_YSIZE * TILEY - y,
+ SX + MAX_BUF_XSIZE * TILEX - x, SY);
+ BlitBitmap(screenBitmap, target_bitmap, x, 0,
+ MAX_BUF_XSIZE * TILEX - x, y - 2 * TILEY,
+ SX, SY + MAX_BUF_YSIZE * TILEY - y);
+ BlitBitmap(screenBitmap, target_bitmap, 0, 0,
+ x - 2 * TILEX, y - 2 * TILEY,
+ SX + MAX_BUF_XSIZE * TILEX - x, SY + MAX_BUF_YSIZE * TILEY - y);
+ }
+}
+
+void BackToFront_SP(void)
+{
+ static boolean scrolling_last = FALSE;
+ int left = mScrollX / TILEX;
+ int top = mScrollY / TILEY;
+ boolean scrolling = (mScrollX % TILEX != 0 || mScrollY % TILEY != 0);
+ int x, y;
+
+ SyncDisplay();
+
+ if (1 ||
+ redraw_tiles > REDRAWTILES_THRESHOLD || scrolling || scrolling_last)
+ {
+#if 1
+ BlitScreenToBitmap_SP(window);
+#else
+ /* blit all (up to four) parts of the scroll buffer to the backbuffer */
+ BlitScreenToBitmap_SP(backbuffer);
+
+ /* blit the completely updated backbuffer to the window (in one blit) */
+ BlitBitmap(backbuffer, window, SX, SY, SXSIZE, SYSIZE, SX, SY);
+#endif
+ }
+ else
+ {
+ for (x = 0; x < SCR_FIELDX; x++)
+ {
+ for (y = 0; y < SCR_FIELDY; y++)
+ {
+ int xx = (left + x) % MAX_BUF_XSIZE;
+ int yy = (top + y) % MAX_BUF_YSIZE;
+
+ if (redraw[xx][yy])
+ BlitBitmap(screenBitmap, window,
+ xx * TILEX, yy * TILEY, TILEX, TILEY,
+ SX + x * TILEX, SY + y * TILEY);
+ }
+ }
+ }
+
+ FlushDisplay();
+
+ for (x = 0; x < MAX_BUF_XSIZE; x++)
+ for (y = 0; y < MAX_BUF_YSIZE; y++)
+ redraw[x][y] = FALSE;
+ redraw_tiles = 0;
+
+ scrolling_last = scrolling;
+}
+
+