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// Copyright 2022 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
package cfa635
// State represents the state of the CFA635 LCD.
type LCDState [4][20]byte
func ClearedLCDState() *LCDState {
var r LCDState
for y := range r {
for x := range r[y] {
r[y][x] = 0x20
}
}
return &r
}
func Update(m *Module, old, new *LCDState) error {
if *old == *new {
return nil
}
for y := range old {
var first, last int
for ; first < len(old[y]) && new[y][first] == old[y][first]; first++ {
}
if first == len(old[y]) {
continue
}
for last = len(old[y]) - 1; last > first && new[y][last] == old[y][last]; last-- {
}
if err := m.Put(first, y, new[y][first:last+1]); err != nil {
return err
}
}
return nil
}
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