1 files changed, 91 insertions, 0 deletions
diff --git a/src/trace/imagemap.h b/src/trace/imagemap.h
new file mode 100644
index 0000000..542e641
--- /dev/null
+++ b/src/trace/imagemap.h
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef INKSCAPE_TRACE_IMAGEMAP_H
+#define INKSCAPE_TRACE_IMAGEMAP_H
+
+#include <vector>
+#include <array>
+
+namespace Inkscape {
+namespace Trace {
+
+template <typename T>
+struct MapBase
+{
+    int width;
+    int height;
+    std::vector<T> pixels;
+
+    MapBase(int width, int height)
+        : width(width)
+        , height(height)
+        , pixels(width * height) {}
+
+    int offset(int x, int y) const { return x + y * width; }
+    T       *row(int y)       { return pixels.data() + y * width; }
+    T const *row(int y) const { return pixels.data() + y * width; }
+    void setPixel(int x, int y, T val) { pixels[offset(x, y)] = val; }
+    T getPixel(int x, int y) const { return pixels[offset(x, y)]; }
+};
+
+/*
+ * GrayMap
+ */
+
+struct GrayMap
+    : MapBase<unsigned long>
+{
+    static unsigned long constexpr BLACK = 0;
+    static unsigned long constexpr WHITE = 255 * 3;
+
+    GrayMap(int width, int height);
+
+    bool writePPM(char const *fileName);
+};
+
+/*
+ * RgbMap
+ */
+
+struct RGB
+{
+    unsigned char r;
+    unsigned char g;
+    unsigned char b;
+};
+
+struct RgbMap
+    : MapBase<RGB>
+{
+    RgbMap(int width, int height);
+
+    bool writePPM(char const *fileName);
+};
+
+/*
+ * IndexedMap
+ */
+
+struct IndexedMap
+    : MapBase<unsigned>
+{
+    IndexedMap(int width, int height);
+
+    RGB getPixelValue(int x, int y) const { return clut[getPixel(x, y) % clut.size()]; }
+    bool writePPM(char const *fileName);
+
+    int nrColors;
+    std::array<RGB, 256> clut; ///< Color look-up table.
+};
+
+} // namespace Trace
+} // namespace Inkscape
+
+#endif // INKSCAPE_TRACE_IMAGEMAP_H