diff --git a/Makefile.am b/Makefile.am
index b7f00a33..7ffe6409 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -40,6 +40,8 @@ UTIL_FILES = \
guid.hpp \
hash.cpp \
hash.hpp \
+ image.cpp \
+ image.hpp \
io.cpp \
io.hpp \
ip.cpp \
diff --git a/image.cpp b/image.cpp
new file mode 100644
index 00000000..fe170ca1
--- /dev/null
+++ b/image.cpp
@@ -0,0 +1,82 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim. If not, see .
+ *
+ * Copyright 2011 Danny Robson
+ */
+
+
+#include "image.hpp"
+
+#include "debug.hpp"
+#include "except.hpp"
+
+#include
+
+
+static void
+write_netpbm (const uint8_t *restrict pixels,
+ size_t width,
+ size_t height,
+ size_t stride,
+ const boost::filesystem::path &path,
+ const char* MAGIC) {
+ CHECK_HARD (pixels);
+ CHECK_HARD (width > 0);
+ CHECK_HARD (stride >= width);
+ CHECK_HARD (height > 0);
+
+ // Establish an output stream
+ std::ofstream output (path.native (), std::ios::binary);
+ if (!output.good ())
+ throw util::output_error ("Unable to open output file");
+
+ // Write the PPM header.
+ output << MAGIC << "\n"
+ << width << "\n"
+ << height << "\n"
+ << (size_t)std::numeric_limits::max () << "\n";
+
+ // Write the data rows
+ for (size_t y = 0; y < height; ++y) {
+ for (size_t x = 0; x < width; ++x)
+ output << (size_t)pixels[y * stride + x] << " ";
+
+ output << "\n";
+ }
+}
+
+void
+util::pgm::write (const uint8_t *restrict pixels,
+ size_t width,
+ size_t height,
+ size_t stride,
+ const boost::filesystem::path &path) {
+ // TODO: We should switch between P2 (ascii) and P5 (binary)
+ static const char MAGIC[] = "P2";
+ write_netpbm (pixels, width, height, stride, path, MAGIC);
+}
+
+
+void
+util::ppm::write (const uint8_t *restrict pixels,
+ size_t width,
+ size_t height,
+ size_t stride,
+ const boost::filesystem::path &path) {
+ // TODO: We should switch between P3 (ascii) and P6 (binary)
+ static const char MAGIC[] = "P6";
+ write_netpbm (pixels, width, height, stride, path, MAGIC);
+}
diff --git a/image.hpp b/image.hpp
new file mode 100644
index 00000000..06271d0f
--- /dev/null
+++ b/image.hpp
@@ -0,0 +1,45 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim. If not, see .
+ *
+ * Copyright 2011 Danny Robson
+ */
+
+#ifndef __UTIL_IMAGE_HPP
+#define __UTIL_IMAGE_HPP
+
+#include
+#include
+#include
+
+namespace util {
+ struct pgm {
+ static void write (const uint8_t *restrict pixels,
+ size_t width,
+ size_t height,
+ size_t stride,
+ const boost::filesystem::path &path);
+ };
+
+ struct ppm {
+ static void write (const uint8_t *restrict pixels,
+ size_t width,
+ size_t height,
+ size_t stride,
+ const boost::filesystem::path &path);
+ };
+}
+
+#endif