Add support to load/save GIMP palettes (.gpl files). Issue #112.

src/CMakeLists.txt

@@ -339,6 +339,7 @@ add_library(aseprite-library
   util/col_file.cpp
   util/expand_cel_canvas.cpp
   util/filetoks.cpp
+  util/gpl_file.cpp
   util/misc.cpp
   util/msk_file.cpp
   util/pic_file.cpp

src/base/CMakeLists.txt

@@ -31,4 +31,5 @@ add_library(base-lib
   split_string.cpp
   string.cpp
   thread.cpp
+  trim_string.cpp
   version.cpp)

src/base/trim_string.cpp

@@ -0,0 +1,28 @@
+// ASEPRITE base library
+// Copyright (C) 2001-2012  David Capello
+//
+// This source file is ditributed under a BSD-like license, please
+// read LICENSE.txt for more information.
+
+#include "config.h"
+
+#include "base/trim_string.h"
+#include <cctype>
+
+void base::trim_string(const base::string& input, base::string& output)
+{
+  size_t i, j;
+
+  for (i=0; i<input.size(); ++i)
+    if (!std::isspace(input.at(i)))
+      break;
+
+  for (j=input.size()-1; j>i; --j)
+    if (!std::isspace(input.at(j)))
+      break;
+
+  if (i < j)
+    output = input.substr(i, j - i + 1);
+  else
+    output = "";
+}

src/base/trim_string.h

@@ -0,0 +1,18 @@
+// ASEPRITE base library
+// Copyright (C) 2001-2012  David Capello
+//
+// This source file is ditributed under a BSD-like license, please
+// read LICENSE.txt for more information.
+
+#ifndef BASE_TRIM_STRING_H_INCLUDED
+#define BASE_TRIM_STRING_H_INCLUDED
+
+#include "base/string.h"
+
+namespace base {
+
+  void trim_string(const base::string& input, base::string& output);
+
+}
+
+#endif

src/commands/cmd_palette_editor.cpp

@@ -578,7 +578,7 @@ void PaletteEntryEditor::onPasteColorsClick(Event& ev)
 void PaletteEntryEditor::onLoadPaletteClick(Event& ev)
 {
   Palette *palette;
-  base::string filename = app::show_file_selector("Load Palette", "", "png,pcx,bmp,tga,lbm,col");
+  base::string filename = app::show_file_selector("Load Palette", "", "png,pcx,bmp,tga,lbm,col,gpl");
   if (!filename.empty()) {
     palette = Palette::load(filename.c_str());
     if (!palette) {
@@ -597,7 +597,7 @@ void PaletteEntryEditor::onSavePaletteClick(Event& ev)
   int ret;
 
  again:
-  filename = app::show_file_selector("Save Palette", "", "png,pcx,bmp,tga,col");
+  filename = app::show_file_selector("Save Palette", "", "png,pcx,bmp,tga,col,gpl");
   if (!filename.empty()) {
     if (exists(filename.c_str())) {
       ret = Alert::show("Warning<<File exists, overwrite it?<<%s||&Yes||&No||&Cancel",

src/raster/palette.cpp

@@ -25,7 +25,8 @@
 #include "gfx/rgb.h"
 #include "raster/image.h"
 #include "raster/palette.h"
-#include "util/col_file.h"
+#include "util/col_file.h"      // TODO Remove circular dependency between "raster" <-> "util"
+#include "util/gpl_file.h"
 
 using namespace gfx;
 
@@ -451,6 +452,9 @@ Palette* Palette::load(const char *filename)
   else if (ustricmp(ext, "col") == 0) {
     pal = load_col_file(filename);
   }
+  else if (ustricmp(ext, "gpl") == 0) {
+    pal = load_gpl_file(filename);
+  }
 
   return pal;
 }
@@ -483,6 +487,9 @@ bool Palette::save(const char *filename) const
   else if (ustricmp(ext, "col") == 0) {
     success = save_col_file(this, filename);
   }
+  else if (ustricmp(ext, "gpl") == 0) {
+    success = save_gpl_file(this, filename);
+  }
 
   return success;
 }

src/util/gpl_file.cpp

@@ -0,0 +1,84 @@
+/* ASEPRITE
+ * Copyright (C) 2001-2012  David Capello
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#include "base/split_string.h"
+#include "base/trim_string.h"
+#include "base/unique_ptr.h"
+#include "raster/image.h"
+#include "raster/palette.h"
+
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <iomanip>
+
+Palette* load_gpl_file(const char *filename)
+{
+  std::ifstream f(filename);
+  if (f.bad()) return NULL;
+
+  // Read first line, it must be "GIMP Palette"
+  std::string line;
+  if (!std::getline(f, line)) return NULL;
+  base::trim_string(line, line);
+  if (line != "GIMP Palette") return NULL;
+
+  UniquePtr<Palette> pal(new Palette(0, 256));
+  int entryCounter = 0;
+
+  while (std::getline(f, line)) {
+    // Trim line.
+    base::trim_string(line, line);
+
+    // Remove comments
+    if (line.empty() || line[0] == '#')
+      continue;
+
+    int r, g, b;
+    std::istringstream lineIn(line);
+    lineIn >> r >> g >> b;
+    if (lineIn.good()) {
+      pal->setEntry(entryCounter, _rgba(r, g, b, 255));
+      ++entryCounter;
+      if (entryCounter >= Palette::MaxColors)
+        break;
+    }
+  }
+
+  return pal.release();
+}
+
+bool save_gpl_file(const Palette *pal, const char *filename)
+{
+  std::ofstream f(filename);
+  if (f.bad()) return false;
+
+  f << "GIMP Palette\n"
+    << "#\n";
+
+  for (int i=0; i<pal->size(); ++i) {
+    uint32_t col = pal->getEntry(i);
+    f << std::setfill(' ') << std::setw(3) << ((int)_rgba_getr(col)) << " "
+      << std::setfill(' ') << std::setw(3) << ((int)_rgba_getg(col)) << " "
+      << std::setfill(' ') << std::setw(3) << ((int)_rgba_getb(col)) << "\tUntitled\n";
+  }
+
+  return true;
+}

src/util/gpl_file.h

@@ -0,0 +1,27 @@
+/* ASEPRITE
+ * Copyright (C) 2001-2012  David Capello
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef UTIL_GPL_FILE_H_INCLUDED
+#define UTIL_GPL_FILE_H_INCLUDED
+
+class Palette;
+
+Palette* load_gpl_file(const char* filename);
+bool save_gpl_file(const Palette* pal, const char* filename);
+
+#endif