start adding colorspace path operations to the operation context

src/UglyToad.PdfPig.Tests/Graphics/TestOperationContext.cs

@@ -18,6 +18,8 @@
 
         public PdfPath CurrentPath { get; set; }
 
+        public IColorspaceContext ColorspaceContext { get; } = new ColorspaceContext();
+
         public PdfPoint CurrentPosition { get; set; }
 
         public TestOperationContext()
@@ -69,4 +71,39 @@
         {
         }
     }
+
+    public class TestColorspaceContext : IColorspaceContext
+    {
+        public void SetStrokingColorspace(NameToken colorspace)
+        {
+        }
+
+        public void SetNonStrokingColorspace(NameToken colorspace)
+        {
+        }
+
+        public void SetStrokingColorGray(decimal gray)
+        {
+        }
+
+        public void SetStrokingColorRgb(decimal r, decimal g, decimal b)
+        {
+        }
+
+        public void SetStrokingColorCmyk(decimal c, decimal m, decimal y, decimal k)
+        {
+        }
+
+        public void SetNonStrokingColorGray(decimal gray)
+        {
+        }
+
+        public void SetNonStrokingColorRgb(decimal r, decimal g, decimal b)
+        {
+        }
+
+        public void SetNonStrokingColorCmyk(decimal c, decimal m, decimal y, decimal k)
+        {
+        }
+    }
 }

src/UglyToad.PdfPig.Tests/PublicApiScannerTests.cs

@@ -84,6 +84,7 @@
                 "UglyToad.PdfPig.Graphics.Core.TextRenderingMode",
                 "UglyToad.PdfPig.Graphics.CurrentFontState",
                 "UglyToad.PdfPig.Graphics.CurrentGraphicsState",
+                "UglyToad.PdfPig.Graphics.IColorspaceContext",
                 "UglyToad.PdfPig.Graphics.IOperationContext",
                 "UglyToad.PdfPig.Graphics.Operations.ClippingPaths.ModifyClippingByEvenOddIntersect",
                 "UglyToad.PdfPig.Graphics.Operations.ClippingPaths.ModifyClippingByNonZeroWindingIntersect",

src/UglyToad.PdfPig/Graphics/ColorspaceContext.cs

@@ -0,0 +1,39 @@
+namespace UglyToad.PdfPig.Graphics
+{
+    using Tokens;
+
+    internal class ColorspaceContext : IColorspaceContext
+    {
+        public void SetStrokingColorspace(NameToken colorspace)
+        {
+        }
+
+        public void SetNonStrokingColorspace(NameToken colorspace)
+        {
+        }
+
+        public void SetStrokingColorGray(decimal gray)
+        {
+        }
+
+        public void SetStrokingColorRgb(decimal r, decimal g, decimal b)
+        {
+        }
+
+        public void SetStrokingColorCmyk(decimal c, decimal m, decimal y, decimal k)
+        {
+        }
+
+        public void SetNonStrokingColorGray(decimal gray)
+        {
+        }
+
+        public void SetNonStrokingColorRgb(decimal r, decimal g, decimal b)
+        {
+        }
+
+        public void SetNonStrokingColorCmyk(decimal c, decimal m, decimal y, decimal k)
+        {
+        }
+    }
+}

src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs

@@ -33,6 +33,9 @@
         public TextMatrices TextMatrices { get; } = new TextMatrices();
 
         public PdfPath CurrentPath { get; private set; }
+
+        public IColorspaceContext ColorspaceContext { get; } = new ColorspaceContext();
+
         public PdfPoint CurrentPosition { get; set; }
 
         public int StackSize => graphicsStack.Count;

src/UglyToad.PdfPig/Graphics/IColorspaceContext.cs

@@ -0,0 +1,66 @@
+namespace UglyToad.PdfPig.Graphics
+{
+    using Tokens;
+
+    /// <summary>
+    /// Methods for manipulating and retrieving the current color state for a PDF content stream.
+    /// </summary>
+    public interface IColorspaceContext
+    {
+        /// <summary>
+        ///  Set the current color space to use for stroking operations.
+        /// </summary>
+        void SetStrokingColorspace(NameToken colorspace);
+
+        /// <summary>
+        ///  Set the current color space to use for nonstroking operations.
+        /// </summary>
+        void SetNonStrokingColorspace(NameToken colorspace);
+
+        /// <summary>
+        /// Set the stroking color space to DeviceGray and set the gray level to use for stroking operations.
+        /// </summary>
+        /// <param name="gray">A number between 0.0 (black) and 1.0 (white).</param>
+        void SetStrokingColorGray(decimal gray);
+
+        /// <summary>
+        /// Set the stroking color space to DeviceRGB and set the color to use for stroking operations.
+        /// </summary>
+        /// <param name="r">Red - A number between 0 (minimum intensity) and 1 (maximum intensity).</param>
+        /// <param name="g">Green - A number between 0 (minimum intensity) and 1 (maximum intensity).</param>
+        /// <param name="b">Blue - A number between 0 (minimum intensity) and 1 (maximum intensity).</param>
+        void SetStrokingColorRgb(decimal r, decimal g, decimal b);
+
+        /// <summary>
+        /// Set the stroking color space to DeviceCMYK and set the color to use for stroking operations. 
+        /// </summary>
+        /// <param name="c">Cyan - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        /// <param name="m">Magenta - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        /// <param name="y">Yellow - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        /// <param name="k">Black - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        void SetStrokingColorCmyk(decimal c, decimal m, decimal y, decimal k);
+        
+        /// <summary>
+        /// Set the nonstroking color space to DeviceGray and set the gray level to use for nonstroking operations.
+        /// </summary>
+        /// <param name="gray">A number between 0.0 (black) and 1.0 (white).</param>
+        void SetNonStrokingColorGray(decimal gray);
+
+        /// <summary>
+        /// Set the nonstroking color space to DeviceRGB and set the color to use for nonstroking operations.
+        /// </summary>
+        /// <param name="r">Red - A number between 0 (minimum intensity) and 1 (maximum intensity).</param>
+        /// <param name="g">Green - A number between 0 (minimum intensity) and 1 (maximum intensity).</param>
+        /// <param name="b">Blue - A number between 0 (minimum intensity) and 1 (maximum intensity).</param>
+        void SetNonStrokingColorRgb(decimal r, decimal g, decimal b);
+
+        /// <summary>
+        /// Set the nonstroking color space to DeviceCMYK and set the color to use for nonstroking operations. 
+        /// </summary>
+        /// <param name="c">Cyan - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        /// <param name="m">Magenta - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        /// <param name="y">Yellow - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        /// <param name="k">Black - A number between 0 (minimum concentration) and 1 (maximum concentration).</param>
+        void SetNonStrokingColorCmyk(decimal c, decimal m, decimal y, decimal k);
+    }
+}

src/UglyToad.PdfPig/Graphics/IOperationContext.cs

@@ -18,7 +18,12 @@
         PdfPath CurrentPath { get; }
 
         /// <summary>
-        /// The current p
+        /// The active colorspaces for this content stream.
+        /// </summary>
+        IColorspaceContext ColorspaceContext { get; }
+
+        /// <summary>
+        /// The current position.
         /// </summary>
         PdfPoint CurrentPosition { get; set; }
 

src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceCmyk.cs

@@ -54,6 +54,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetNonStrokingColorCmyk(C, M, Y, K);
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceGray.cs

@@ -33,6 +33,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetNonStrokingColorGray(Gray);
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorDeviceRgb.cs

@@ -47,6 +47,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetNonStrokingColorRgb(R, G, B);
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetNonStrokeColorSpace.cs

@@ -36,6 +36,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetNonStrokingColorspace(Name);
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColor.cs

@@ -14,7 +14,7 @@
         /// The symbol for this operation in a stream.
         /// </summary>
         public const string Symbol = "SC";
-        
+
         /// <inheritdoc />
         public string Operator => Symbol;
 
@@ -35,6 +35,20 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            switch (Operands.Count)
+            {
+                case 1:
+                    operationContext.ColorspaceContext.SetStrokingColorGray(Operands[0]);
+                    break;
+                case 3:
+                    operationContext.ColorspaceContext.SetStrokingColorRgb(Operands[0], Operands[1], Operands[2]);
+                    break;
+                case 4:
+                    operationContext.ColorspaceContext.SetStrokingColorCmyk(Operands[0], Operands[1], Operands[2], Operands[3]);
+                    break;
+                default:
+                    return;
+            }
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceCmyk.cs

@@ -54,6 +54,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetStrokingColorCmyk(C, M, Y, K);
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceGray.cs

@@ -33,6 +33,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetStrokingColorGray(Gray);
         }
         
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorDeviceRgb.cs

@@ -47,6 +47,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetStrokingColorRgb(R, G, B);
         }
 
         /// <inheritdoc />

src/UglyToad.PdfPig/Graphics/Operations/SetStrokeColorSpace.cs

@@ -36,6 +36,7 @@
         /// <inheritdoc />
         public void Run(IOperationContext operationContext)
         {
+            operationContext.ColorspaceContext.SetStrokingColorspace(Name);
         }
 
         /// <inheritdoc />