[cpp] Add PNM (PBM/PGM/PPM) exporting to 'image'.

Introduce a custom ImgWriter (PNMWriter) for exporting in the PNM variants,
and use it choosing the output format matching as close as possible the format of the image.

1 files changed, 21 insertions, 1 deletions

diff --git a/cpp/poppler-image.cpp b/cpp/poppler-image.cpp
index ef213a5c..61f4c1e2 100644
--- a/cpp/poppler-image.cpp
+++ b/cpp/poppler-image.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010, Pino Toscano <pino@kde.org>
+ * Copyright (C) 2010-2011, Pino Toscano <pino@kde.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
@@ -31,6 +31,7 @@
 #if defined(ENABLE_LIBTIFF)
 #include "TiffWriter.h"
 #endif
+#include "PNMWriter.h"
 
 #include <cstdlib>
 #include <cstring>
@@ -38,6 +39,8 @@
 #include <memory>
 #include <vector>
 
+using poppler::PNMWriter;
+
 namespace {
 
 struct FileCloser {
@@ -66,6 +69,19 @@ int calc_bytes_per_row(int width, poppler::image::format_enum format)
     return 0;
 }
 
+PNMWriter::OutFormat pnm_format(poppler::image::format_enum format)
+{
+    switch (format) {
+    case poppler::image::format_invalid: // unused, anyway
+    case poppler::image::format_mono:
+        return PNMWriter::PBM;
+    case poppler::image::format_rgb24:
+    case poppler::image::format_argb32:
+        return PNMWriter::PPM;
+    }
+    return PNMWriter::PPM;
+}
+
 }
 
 using namespace poppler;
@@ -348,6 +364,9 @@ bool image::save(const std::string &file_name, const std::string &out_format, in
         w.reset(new TiffWriter());
     }
 #endif
+    else if (fmt == "pnm") {
+        w.reset(new PNMWriter(pnm_format(d->format)));
+    }
     if (!w.get()) {
         return false;
     }
@@ -418,6 +437,7 @@ std::vector<std::string> image::supported_image_formats()
 #if defined(ENABLE_LIBTIFF)
     formats.push_back("tiff");
 #endif
+    formats.push_back("pnm");
     return formats;
 }