1 files changed, 49 insertions, 0 deletions
diff --git a/src/pnm.h b/src/pnm.h
new file mode 100644
index 0000000..3c1b2ee
--- /dev/null
+++ b/src/pnm.h
@@ -0,0 +1,49 @@
+/**
+ * scrotty — Screenshot program for Linux's TTY
+ * 
+ * Copyright © 2014, 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdio.h>
+
+
+/**
+ * Store a pixel to an PNM image.
+ * 
+ * A pixel in the PNM image is formatted as `%{red} %{green} %{blue} ` in text.
+ * 
+ * @parma   F:FILE *  The file whither the pixel shall be save.
+ * @param   R:int     The [0, 255]-value on the red subpixel.
+ * @param   G:int     The [0, 255]-value on the green subpixel.
+ * @param   B:int     The [0, 255]-value on the blue subpixel.
+ * @return            Positive on success (not zero!), -1 on error.
+ */
+#define SAVE_PIXEL(F, R, G, B)  \
+  fprintf (F, "%s%s%s", inttable[R], inttable[G], inttable[B])
+
+
+/**
+ * [0, 255]-integer-to-text convertion lookup table for faster conversion from
+ * raw framebuffer data to the PNM format. The values have a whitespace at the
+ * end for even faster conversion.
+ * Lines should not be longer than 70 (although most programs will probably
+ * work even if there are longer lines), therefore the selected whitespace
+ * is LF (new line).
+ * 
+ * ASCII is wider supported than binary, and is create for version control,
+ * especifially with one datum per line.
+ */
+extern const char* inttable[];
+