From 6745bc1b48fdb376587885d2cdb818078eea96ef Mon Sep 17 00:00:00 2001
From: Christian Baars <baars@klinikum-brandenburg.de>
Date: Sat, 21 Dec 2024 18:36:43 +0100
Subject: [PATCH] add scroll to Leds_matrix (#22693)

---
 .../berry_tasmota/src/embedded/leds.be        | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)

diff --git a/lib/libesp32/berry_tasmota/src/embedded/leds.be b/lib/libesp32/berry_tasmota/src/embedded/leds.be
index 98fbbfd29..555096092 100644
--- a/lib/libesp32/berry_tasmota/src/embedded/leds.be
+++ b/lib/libesp32/berry_tasmota/src/embedded/leds.be
@@ -358,6 +358,103 @@ class Leds : Leds_ntv
           self.strip.set_pixel_color(x * self.w + y + self.offset, col, bri)
         end
       end
+
+      def scroll(direction, outshift, inshift) # 0 - up, 1 - left, 2 - down, 3 - right ; outshift mandatory, inshift optional
+        var buf = self.pix_buffer
+        var h = self.h
+        var sz = self.w * 3 # row size in bytes
+        var pos
+        if direction%2 == 0 #up/down
+          if direction == 0 #up
+            outshift.setbytes(0,(buf[0..sz-1]).reverse(0,nil,3))
+            var line = 0
+            while line < (h-1)
+              pos = 0
+              var offset_dst = line * sz
+              var offset_src = ((line+2) * sz) - 3
+              while pos < sz
+                var dst = pos + offset_dst
+                var src = offset_src - pos
+                buf[dst] = buf[src]
+                buf[dst+1] = buf[src+1]
+                buf[dst+2] = buf[src+2]
+                pos += 3
+              end
+              line += 1
+            end
+            var lastline = inshift ? inshift : outshift
+            if h%2 == 1
+              lastline.reverse(0,nil,3)
+            end
+            buf.setbytes((h-1) * sz, lastline)
+          else # down
+            outshift.setbytes(0,(buf[size(buf)-sz..]).reverse(0,nil,3))
+            var line = h - 1
+            while line > 0
+              buf.setbytes(line * sz,(buf[(line-1) * sz..line * sz-1]).reverse(0,nil,3))
+              line -= 1
+            end
+            var lastline = inshift ? inshift : outshift
+            if h%2 == 1
+              lastline.reverse(0,nil,3)
+            end
+            buf.setbytes(0, lastline)
+          end
+        else # left/right
+          var line = 0
+          var step = 3
+          if direction == 3 # right
+            step *= -1
+          end
+          while line < h
+            pos = line * sz
+            if step > 0
+                var line_end = pos + sz - step
+                outshift[(line * 3)] = buf[pos]
+                outshift[(line * 3) + 1] = buf[pos+1]
+                outshift[(line * 3) + 2] = buf[pos+2]
+                while pos < line_end
+                  buf[pos] = buf[pos+3]
+                  buf[pos+1] = buf[pos+4]
+                  buf[pos+2] = buf[pos+5]
+                  pos += step
+                end
+                if inshift == nil
+                  buf[line_end] = outshift[(line * 3)]
+                  buf[line_end+1] = outshift[(line * 3) + 1]
+                  buf[line_end+2] = outshift[(line * 3) + 2]
+                else
+                  buf[line_end] = inshift[(line * 3)]
+                  buf[line_end+1] = inshift[(line * 3) + 1]
+                  buf[line_end+2] = inshift[(line * 3) + 2]
+                end
+              else
+                var line_end = pos
+                pos = pos + sz + step
+                outshift[(line * 3)] = buf[pos]
+                outshift[(line * 3) + 1] = buf[pos+1]
+                outshift[(line * 3) + 2] = buf[pos+2]
+                while pos > line_end
+                  buf[pos] = buf[pos-3]
+                  buf[pos+1] = buf[pos-2]
+                  buf[pos+2] = buf[pos-1]
+                  pos += step
+                end
+                if inshift == nil
+                  buf[line_end] = outshift[(line * 3)]
+                  buf[line_end+1] = outshift[(line * 3) + 1]
+                  buf[line_end+2] = outshift[(line * 3) + 2]
+                else
+                  buf[line_end] = inshift[(line * 3)]
+                  buf[line_end+1] = inshift[(line * 3) + 1]
+                  buf[line_end+2] = inshift[(line * 3) + 2]
+                end
+              end
+              step *= -1
+              line += 1
+          end
+        end
+      end
     end
 
     return Leds_matrix(self, w, h, offset)