Added previews to 3 nodes

src/PixiEditor.ChangeableDocument/Changeables/Graph/Nodes/CreateImageNode.cs

@@ -48,6 +48,7 @@ public class CreateImageNode : Node
         }
 
         var surface = Render(context);
+        RenderPreviews(surface, context);
 
         Output.Value = surface;
 
@@ -99,6 +100,30 @@ public class CreateImageNode : Node
         surface.Canvas.RestoreToCount(saved);
     }
 
+    private void RenderPreviews(Texture surface, RenderContext context)
+    {
+        var previews = context.GetPreviewTexturesForNode(Id);
+        if (previews is null) return;
+        foreach (var request in previews)
+        {
+            var texture = request.Texture;
+            if (texture is null) continue;
+
+            int saved = texture.DrawingSurface.Canvas.Save();
+
+            VecD scaling = PreviewUtility.CalculateUniformScaling(surface.Size, texture.Size);
+            VecD offset = PreviewUtility.CalculateCenteringOffset(surface.Size, texture.Size, scaling);
+            texture.DrawingSurface.Canvas.Translate((float)offset.X, (float)offset.Y);
+            texture.DrawingSurface.Canvas.Scale((float)scaling.X, (float)scaling.Y);
+            var previewCtx =
+                PreviewUtility.CreatePreviewContext(context, scaling, context.RenderOutputSize, texture.Size);
+
+            texture.DrawingSurface.Canvas.Clear();
+            texture.DrawingSurface.Canvas.DrawSurface(surface.DrawingSurface, 0, 0);
+            texture.DrawingSurface.Canvas.RestoreToCount(saved);
+        }
+    }
+
     public override Node CreateCopy() => new CreateImageNode();
 
     public override void Dispose()
@@ -106,28 +131,4 @@ public class CreateImageNode : Node
         base.Dispose();
         textureCache.Dispose();
     }
-
-    public bool RenderPreview(DrawingSurface renderOn, RenderContext context, string elementToRenderName)
-    {
-        if (Size.Value.X <= 0 || Size.Value.Y <= 0)
-        {
-            return false;
-        }
-
-        if (Output.Value == null)
-        {
-            return false;
-        }
-
-        var surface = Render(context);
-        
-        if (surface == null || surface.IsDisposed)
-        {
-            return false;
-        }
-        
-        renderOn.Canvas.DrawSurface(surface.DrawingSurface, 0, 0);
-        
-        return true;
-    }
 }

src/PixiEditor.ChangeableDocument/Changeables/Graph/Nodes/ModifyImageLeftNode.cs

@@ -48,11 +48,36 @@ public class ModifyImageLeftNode : Node, IPairNode
 
     protected override void OnExecute(RenderContext context)
     {
+        RenderPreviews(context);
     }
 
     public override Node CreateCopy() => new ModifyImageLeftNode();
 
-    public bool RenderPreview(DrawingSurface renderOn, RenderContext context, string elementToRenderName)
+    private void RenderPreviews(RenderContext context)
+    {
+        var previews = context.GetPreviewTexturesForNode(Id);
+        if (previews is null) return;
+        foreach (var request in previews)
+        {
+            var texture = request.Texture;
+            if (texture is null) continue;
+
+            int saved = texture.DrawingSurface.Canvas.Save();
+
+            VecD scaling = PreviewUtility.CalculateUniformScaling(context.DocumentSize, texture.Size);
+            VecD offset = PreviewUtility.CalculateCenteringOffset(context.DocumentSize, texture.Size, scaling);
+            texture.DrawingSurface.Canvas.Translate((float)offset.X, (float)offset.Y);
+            texture.DrawingSurface.Canvas.Scale((float)scaling.X, (float)scaling.Y);
+            var previewCtx =
+                PreviewUtility.CreatePreviewContext(context, scaling, context.RenderOutputSize, texture.Size);
+
+            texture.DrawingSurface.Canvas.Clear();
+            RenderPreview(texture.DrawingSurface);
+            texture.DrawingSurface.Canvas.RestoreToCount(saved);
+        }
+    }
+
+    public bool RenderPreview(DrawingSurface renderOn)
     {
         if(Image.Value is null)
         {

src/PixiEditor.ChangeableDocument/Changeables/Graph/Nodes/ModifyImageRightNode.cs

@@ -2,6 +2,7 @@
 using PixiEditor.ChangeableDocument.Changeables.Graph.Interfaces;
 using PixiEditor.ChangeableDocument.Rendering;
 using Drawie.Backend.Core;
+using Drawie.Backend.Core.Numerics;
 using Drawie.Backend.Core.Shaders.Generation;
 using Drawie.Backend.Core.Shaders.Generation.Expressions;
 using Drawie.Backend.Core.Surfaces;
@@ -119,7 +120,10 @@ public class ModifyImageRightNode : RenderNode, IPairNode, ICustomShaderNode
         var startNode = FindStartNode();
         if (drawingPaint != null && startNode is { Image.Value: not null })
         {
-            renderOn.Canvas.DrawRect(0, 0, startNode.Image.Value.Size.X, startNode.Image.Value.Size.Y, drawingPaint);
+            using var tmpTex = Texture.ForProcessing(startNode.Image.Value.Size, context.ProcessingColorSpace);
+
+            tmpTex.DrawingSurface.Canvas.DrawRect(0, 0, startNode.Image.Value.Size.X, startNode.Image.Value.Size.Y, drawingPaint);
+            renderOn.Canvas.DrawSurface(tmpTex.DrawingSurface, 0, 0);
         }
     }