add linux thumbnailers for Gnome & KDE/Qt

This adds thumbnailer support both for Gnome and KDE5/Qt5. The gnome
thumbnailer is installed by default on linux systems, as it does not add
any additional dependencies at build time and can be used by
GnomeThumbnailFactory. The KDE/Qt thumbnailer need the whole Qt and Kio
stack to build, as well as the distribution dependend variables set.
Because of that it is not build by default. For the thumnailers to work
for all of aseprites supported file formats and additonal mime type file
is installed. Packagers in addition need to call update-mime-database
path-to-mime-database (/usr/share/mime for example) as post install
command.

CMakeLists.txt

@@ -38,6 +38,9 @@ option(WITH_WEBP_SUPPORT  "Enable support to load/save .webp files" off)
 option(WITH_GTK_FILE_DIALOG_SUPPORT "Enable support for the experimental native GTK File Dialog" off)
 option(WITH_DEPRECATED_GLIB_SUPPORT "Enable support for older glib versions" off)
 
+option(WITH_DESKTOP_INTEGRATION "Enable desktop integration modules" on)
+option(WITH_QT_THUMBNAILER "Enable kde5/qt5 thumnailer" off)
+
 option(USE_STATIC_LIBC    "Use static version of C and C++ runtimes" off)
 option(USE_SHARED_CURL    "Use your installed copy of curl" off)
 option(USE_SHARED_GIFLIB  "Use your installed copy of giflib" off)
@@ -396,6 +399,10 @@ if(APPLE)
     endif(COMPILER_GCC)
 endif(APPLE)
 
+if(WITH_DESKTOP_INTEGRATION)
+  add_subdirectory(desk)
+endif()
+
 ######################################################################
 # Main ASE targets
 

desk/CMakeLists.txt

@@ -0,0 +1,11 @@
+if(UNIX AND NOT APPLE)
+  install(FILES mime/aseprite.xml
+          DESTINATION share/mime/packages)
+  install(PROGRAMS aseprite-thumbnailer
+          DESTINATION bin)
+  install(FILES gnome/aseprite.thumbnailer
+          DESTINATION share/thumbnailers)
+  if(WITH_QT_THUMBNAILER)
+    add_subdirectory(kde)
+  endif()
+endif()

desk/aseprite-thumbnailer

@@ -0,0 +1,13 @@
+#!/usr/bin/sh
+if [ $# -ge 2 -a $# -lt 4 ]; then
+  mkdir -p /tmp/Aseprite
+  filename=${1//\//.}$RANDOM
+  if [ $# -eq 2 ]; then
+    aseprite -b --frame-range "0,0" $1 --sheet /tmp/Aseprite/$filename.png
+  elif [ $# -eq 3 ]; then
+    aseprite -b --frame-range "0,0" $1 --shrink-to "$3,$3" --sheet /tmp/Aseprite/$filename.png
+  fi
+  mkdir -p $(dirname "$2"); mv /tmp/Aseprite/$filename.png $2; 
+else
+echo "Parameters for aseprite thumbnailer are: inputfile outputfile [size]"
+fi

desk/gnome/aseprite.thumbnailer

@@ -0,0 +1,4 @@
+[Thumbnailer Entry]
+TryExec=aseprite-thumbnailer
+Exec=aseprite-thumbnailer %i %o %s
+MimeType=image/bmp;image/gif;image/jpeg;image/png;image/x-pcx;image/x-tga;image/vnd.microsoft.icon;video/x-flic;image/webp;image/x-aseprite;

desk/kde/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 2.8.12)
+set(QT_MIN_VERSION "5.2.0")
+project(asepritethumbnail)
+find_package(ECM REQUIRED NO_MODULE)
+set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
+set(KDE_INSTALL_DIRS_NO_DEPRECATED, TRUE)
+include(FeatureSummary)
+include(WriteBasicConfigVersionFile)
+include(KDEInstallDirs)
+include(KDECMakeSettings)
+include(KDECompilerSettings)
+find_package(KF5 REQUIRED COMPONENTS KIO)
+add_definitions(${QT_DEFINITIONS} -DQT_USE_FAST_CONCATENATION -DQT_USE_FAST_OPERATOR_PLUS)
+set(KDE_INSTALL_USE_QT_SYS_PATHS)
+add_library(asepritethumbnail MODULE aseprite_thumb_creator.cpp)
+target_link_libraries(asepritethumbnail KF5::KIOWidgets)
+install(TARGETS asepritethumbnail DESTINATION ${PLUGIN_INSTALL_DIR})
+install(FILES asepritethumbnail.desktop DESTINATION ${SERVICES_INSTALL_DIR})

desk/kde/aseprite_thumb_creator.cpp

@@ -0,0 +1,33 @@
+#include "aseprite_thumb_creator.h"
+
+#include <QImage>
+#include <QProcess>
+#include <QStringList>
+#include <QFile>
+#include <QCryptographicHash>
+#include <cstdio>
+
+extern "C"
+{
+  Q_DECL_EXPORT ThumbCreator *new_creator()
+  {
+    return new AsepriteThumbCreator();
+  }
+};
+
+bool AsepriteThumbCreator::create(const QString& path, int width, int height, QImage& img ) {
+  QProcess process;
+  QStringList list;
+  QString tmpFile = QString(QCryptographicHash::hash(path.toLocal8Bit(),QCryptographicHash::Md5).toHex());
+  list << path << tmpFile;
+  process.start(QString("aseprite-thumbnailer"), list);
+  if (!process.waitForFinished()) return false;
+  img.load(tmpFile);
+  QFile::remove(tmpFile);
+  return true;
+}
+
+AsepriteThumbCreator::Flags AsepriteThumbCreator::flags() const
+{
+  return DrawFrame;
+}

desk/kde/aseprite_thumb_creator.h

@@ -0,0 +1,16 @@
+#ifndef _ASEPRITE_THUMBCREATOR_H_
+#define _ASEPRITE_THUMBCREATOR_H_
+#pragma once
+
+#include <QLoggingCategory>
+Q_DECLARE_LOGGING_CATEGORY(LOG_ASEPRITE_THUMBCREATOR)
+
+#include <kio/thumbcreator.h>
+
+class AsepriteThumbCreator : public ThumbCreator {
+  public:
+    virtual bool create(const QString& path, int width, int height, QImage& img);
+    virtual Flags flags() const;
+};
+
+#endif

desk/kde/asepritethumbnail.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Type=Service
+Name=Aseprite Pixel Art
+MimeType=image/bmp;image/gif;image/jpeg;image/png;image/x-pcx;image/x-tga;image/vnd.microsoft.icon;video/x-flic;image/webp;image/x-aseprite;
+X-KDE-ServiceTypes=ThumbCreator
+X-KDE-Library=asepritethumbnail
+CacheThumbnail=true
+ThumbnailerVersion=1

desk/mime/aseprite.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+  <mime-type type="image/x-aseprite">
+         <comment xml:lang="en">Aseprite Pixel Art</comment>
+         <magic priority="50">
+                <match type="little16" value="0xA5E0" offset="4"/>
+         </magic>
+         <glob pattern="*.ase"/>
+         <glob pattern="*.aseprite"/>
+        <icon name="aseprite"/>
+  </mime-type>
+</mime-info>