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diff --git a/src/graphics_state.h b/src/graphics_state.h
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+/*
+ * Copyright 2018 Vincent Sanders <vince@netsurf-browser.org>
+ *
+ * This file is part of libnspdf.
+ *
+ * Licensed under the MIT License,
+ *                http://www.opensource.org/licenses/mit-license.php
+ */
+
+/**
+ * \file
+ * NetSurf PDF library graphics state
+ */
+
+#ifndef NSPDF__GRAPHICS_STATE_H_
+#define NSPDF__GRAPHICS_STATE_H_
+
+/**
+ * colourspaces
+ * \todo extend this with full list from section 4.5.2
+ */
+enum graphics_state_colorspace {
+    GSDeviceGray = 0, /* Default */
+    GSDeviceRGB,
+    GSDeviceCMYK,
+};
+
+struct graphics_state_color {
+    enum graphics_state_colorspace space;
+    union {
+        float gray; /* default is 0 - black */
+        float rgb[3];
+        float cmyk[3];
+    };
+};
+
+struct graphics_state_param {
+    float ctm[6]; /* current transform matrix */
+    /* clipping path */
+    struct graphics_state_color stroke_colour;
+    struct graphics_state_color other_colour;
+    /* text state */
+    float line_width;
+    unsigned int line_cap;
+    unsigned int line_join;
+    float miter_limit;
+    /* dash pattern */
+    /* rendering intent RelativeColorimetric */
+    bool stroke_adjustment;
+    /* blend mode: Normal */
+    /* soft mask */
+    /* alpha constant */
+    /* alpha source */
+
+    /* device dependant */
+    bool overprint;
+    float overprint_mode;
+    /* black generation */
+    /* undercolor removal */
+    /* transfer */
+    /* halftone */
+    float flatness;
+    float smoothness;
+};
+
+struct graphics_state {
+    float *path; /* current path */
+    unsigned int path_idx; /* current index into path */
+    unsigned int path_alloc; /* current number of path elements allocated */
+
+    struct graphics_state_param *param_stack; /* parameter stack */
+    unsigned int param_stack_idx;
+    unsigned int param_stack_alloc;
+};
+
+#endif