1 files changed, 85 insertions, 0 deletions
diff --git a/Sources/Compositor/OwlSurfaceState.m b/Sources/Compositor/OwlSurfaceState.m
new file mode 100644
index 0000000..1e98daa
--- /dev/null
+++ b/Sources/Compositor/OwlSurfaceState.m
@@ -0,0 +1,85 @@
+/* This file is part of Owl.
+ *
+ * Copyright © 2019-2021 Sergey Bugaev <bugaevc@gmail.com>
+ *
+ * Owl is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Owl is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Owl.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#import "OwlSurfaceState.h"
+#import "OwlBuffer.h"
+
+
+@implementation OwlSurfaceState
+
+- (id) init {
+    _callbacks = [NSMutableArray new];
+    _damage = [NSMutableArray new];
+    return self;
+}
+
+// Make a new state to succeed the given previous state.
+//
+// This copies over parts of the previous state that should
+// be copied over, namely the attached buffer and geometry,
+// and initializes other state to empty values.
+- (id) initWithPreviousState: (OwlSurfaceState *) previousState {
+    self = [self init];
+    _buffer = [previousState->_buffer retain];
+    _geometry = previousState->_geometry;
+    return self;
+}
+
+- (void) dealloc {
+    [_buffer release];
+    [_callbacks release];
+    [_damage release];
+    [super dealloc];
+}
+
+- (OwlBuffer *) buffer {
+    return _buffer;
+}
+
+- (void) setBuffer: (OwlBuffer *) buffer {
+    [buffer retain];
+    [_buffer release];
+    _buffer = buffer;
+}
+
+- (NSArray *) callbacks {
+    return _callbacks;
+}
+
+- (void) addCallback: (OwlCallback *) callback {
+    [_callbacks addObject: callback];
+}
+
+- (NSArray *) damage {
+    return _damage;
+}
+
+- (void) addDamage: (NSRect) damageRect {
+    NSValue *value = [NSValue valueWithRect: damageRect];
+    [_damage addObject: value];
+}
+
+- (NSRect) geometry {
+    return _geometry;
+}
+
+- (void) setGeometry: (NSRect) geometry {
+    _geometry = geometry;
+}
+
+@end