Add support for .pal files (fix #349, related to #181)

src/app/file/palette_file.cpp

@@ -19,6 +19,7 @@
 #include "doc/cel.h"
 #include "doc/file/col_file.h"
 #include "doc/file/gpl_file.h"
+#include "doc/file/pal_file.h"
 #include "doc/image.h"
 #include "doc/layer.h"
 #include "doc/palette.h"
@@ -33,14 +34,14 @@ using namespace doc;
 std::string get_readable_palette_extensions()
 {
   std::string buf = get_readable_extensions();
-  buf += ",col,gpl";
+  buf += ",col,gpl,pal";
   return buf;
 }
 
 std::string get_writable_palette_extensions()
 {
   std::string buf = get_writable_extensions();
-  buf += ",col,gpl";
+  buf += ",col,gpl,pal";
   return buf;
 }
 
@@ -55,6 +56,9 @@ Palette* load_palette(const char *filename)
   else if (ext == "gpl") {
     pal = doc::file::load_gpl_file(filename);
   }
+  else if (ext == "pal") {
+    pal = doc::file::load_pal_file(filename);
+  }
   else {
     FileFormat* ff = FileFormatsManager::instance()->getFileFormatByExtension(ext.c_str());
     if (ff->support(FILE_SUPPORT_LOAD)) {
@@ -99,6 +103,9 @@ bool save_palette(const char *filename, const Palette* pal)
   else if (ext == "gpl") {
     success = doc::file::save_gpl_file(pal, filename);
   }
+  else if (ext == "pal") {
+    success = doc::file::save_pal_file(pal, filename);
+  }
   else {
     FileFormat* ff = FileFormatsManager::instance()->getFileFormatByExtension(ext.c_str());
     if (ff->support(FILE_SUPPORT_SAVE)) {

src/doc/CMakeLists.txt

@@ -25,6 +25,7 @@ add_library(doc-lib
   documents.cpp
   file/col_file.cpp
   file/gpl_file.cpp
+  file/pal_file.cpp
   frame_tag.cpp
   frame_tag_io.cpp
   frame_tags.cpp

src/doc/file/pal_file.cpp

@@ -0,0 +1,97 @@
+// Aseprite Document Library
+// Copyright (c) 2001-2015 David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "base/fstream_path.h"
+#include "base/split_string.h"
+#include "base/trim_string.h"
+#include "base/unique_ptr.h"
+#include "doc/image.h"
+#include "doc/palette.h"
+
+#include <cctype>
+#include <fstream>
+#include <iomanip>
+#include <sstream>
+#include <string>
+
+namespace doc {
+namespace file {
+
+Palette* load_pal_file(const char *filename)
+{
+  std::ifstream f(FSTREAM_PATH(filename));
+  if (f.bad())
+    return nullptr;
+
+  // Read first line, it must be "JASC-PAL"
+  std::string line;
+  if (!std::getline(f, line))
+    return nullptr;
+  base::trim_string(line, line);
+  if (line != "JASC-PAL")
+    return nullptr;
+
+  // Second line is the version (0100)
+  if (!std::getline(f, line))
+    return nullptr;
+  base::trim_string(line, line);
+  if (line != "0100")
+    return nullptr;
+
+  // Ignore number of colors (we'll read line by line anyway)
+  if (!std::getline(f, line))
+    return nullptr;
+
+  base::UniquePtr<Palette> pal(new Palette(frame_t(0), 0));
+
+  while (std::getline(f, line)) {
+    // Trim line
+    base::trim_string(line, line);
+
+    // Remove comments
+    if (line.empty())
+      continue;
+
+    int r, g, b;
+    std::istringstream lineIn(line);
+    lineIn >> r >> g >> b;
+    pal->addEntry(rgba(r, g, b, 255));
+    if (pal->size() == Palette::MaxColors)
+      break;
+  }
+
+  // TODO remove this when Aseprite supports palettes with less than 256 colors
+  if (pal->size() != Palette::MaxColors)
+      pal->resize(Palette::MaxColors);
+
+  return pal.release();
+}
+
+bool save_pal_file(const Palette *pal, const char *filename)
+{
+  std::ofstream f(FSTREAM_PATH(filename));
+  if (f.bad()) return false;
+
+  f << "JASC-PAL\n"
+    << "0100\n"
+    << pal->size() << "\n";
+
+  for (int i=0; i<pal->size(); ++i) {
+    uint32_t col = pal->getEntry(i);
+    f << ((int)rgba_getr(col)) << " "
+      << ((int)rgba_getg(col)) << " "
+      << ((int)rgba_getb(col)) << "\n";
+  }
+
+  return true;
+}
+
+} // namespace file
+} // namespace doc

src/doc/file/pal_file.h

@@ -0,0 +1,23 @@
+// Aseprite Document Library
+// Copyright (c) 2001-2015 David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifndef DOC_FILE_PAL_FILE_H_INCLUDED
+#define DOC_FILE_PAL_FILE_H_INCLUDED
+#pragma once
+
+namespace doc {
+
+  class Palette;
+
+  namespace file {
+
+    Palette* load_pal_file(const char* filename);
+    bool save_pal_file(const Palette* pal, const char* filename);
+
+  } // namespace file
+} // namespace doc
+
+#endif