#73 Optimize the issue of high CPU usage during idle time

MaLiang.podspec

@@ -2,7 +2,7 @@
 Pod::Spec.new do |s|
 
   s.name             = 'MaLiang'
-  s.version          = '2.6.4'
+  s.version          = '2.6.5'
   s.summary          = 'MaLiang is a painting Framework based on Metal.'
   s.description      = 'The name of "MaLiang" comes from a boy who had a magical brush in Chinese ancient fairy story.'
 

MaLiang/Classes/MetalBase/MetalView.swift

@@ -145,7 +145,9 @@ open class MetalView: MTKView {
     open override func draw(_ rect: CGRect) {
         super.draw(rect)
 
-        guard metalAvaliable, let texture = screenTarget?.texture else {
+        guard metalAvaliable,
+            let target = screenTarget, target.modified,
+            let texture = target.texture else {
             return
         }
 
@@ -172,6 +174,8 @@ open class MetalView: MTKView {
             commandBuffer?.present(drawable)
         }
         commandBuffer?.commit()
+
+        target.modified = false
     }
 }
 

MaLiang/Classes/MetalBase/RenderTarget.swift

@@ -65,6 +65,7 @@ open class RenderTarget {
     internal var commandBuffer: MTLCommandBuffer?
     internal var commandQueue: MTLCommandQueue?
     internal var device: MTLDevice?
+    internal var modified = false
 
     internal func updateBuffer(with size: CGSize) {
         self.drawableSize = size
@@ -99,6 +100,7 @@ open class RenderTarget {
     internal func commitCommands() {
         commandBuffer?.commit()
         commandBuffer = nil
+        modified = true
     }
 
     // make empty testure