- Fix LICENSE: their website says it's MIT, but the source code comes

with GPLv3 boilerplate file and README.md says "GPLv3 or later";

- Milton comes with custom TTF font, without it GUI looks pretty bad,
  so install it under ${DATADIR} and set the font path in the program;

- Similar to WIN32 code, set window icon in the platform_setup_cursor()
  function using the IMG_Load() from SDL2 ``image'' package.  While it
  can load Windows ICO files directly, for files with multiple images,
  the first one found with the highest color count is chosen, which in
  our case is 16x16x32 (the smallest).  Tentatively extract all icons
  as PNG files, install them all, and use 256x256 icon by default.

graphics/milton/Makefile

@@ -4,12 +4,15 @@
 PORTNAME=	milton
 PORTVERSION=	1.6.0
 DISTVERSIONPREFIX=	v
+PORTREVISION=	1
 CATEGORIES=	graphics
 
 MAINTAINER=	danfe@FreeBSD.org
 COMMENT=	Infinite-canvas paint program
 
-LICENSE=	MIT
+LICENSE=	GPLv3+
+
+BUILD_DEPENDS=	icotool:graphics/icoutils
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	serge-rgb
@@ -17,16 +20,32 @@ GH_ACCOUNT=	serge-rgb
 USES=		cmake gl gnome
 USE_GL=		gl
 USE_GNOME=	gtk20
-USE_SDL=	sdl2
+USE_SDL=	sdl2 image2
+INSTALLS_ICONS=	yes
 
-PLIST_FILES=	bin/milton
+PLIST_FILES=	bin/milton ${DATADIR_REL}/Carlito.ttf
+.for n in 16 32 48 64 128 256
+PLIST_FILES+=	share/icons/hicolor/${n}x${n}/apps/milton.png
+.endfor
 
 post-patch:
 	@${REINPLACE_CMD} -e 's:__linux__:__${OPSYS}__:' \
 		${WRKSRC}/src/easytab.h
+	@${REINPLACE_CMD} -e 's:Carlito\.ttf:${DATADIR}/&:' \
+		${WRKSRC}/src/sdl_milton.cc
+	@${REINPLACE_CMD} -e 's:milton\.png:${PREFIX}/share/icons/hicolor/256x256/apps/&:' \
+		${WRKSRC}/src/platform_linux.cc
 
 do-install:
 	${INSTALL_PROGRAM} ${INSTALL_WRKSRC}/Milton \
 		${STAGEDIR}${PREFIX}/bin/milton
+	@${MKDIR} ${STAGEDIR}${DATADIR}
+	${INSTALL_DATA} ${WRKSRC}/third_party/Carlito.ttf \
+		${STAGEDIR}${DATADIR}
+.for n in 16 32 48 64 128 256
+	@${MKDIR} ${STAGEDIR}${PREFIX}/share/icons/hicolor/${n}x${n}/apps
+	${INSTALL_DATA} ${INSTALL_WRKSRC}/milton_icon_?_${n}x${n}x32.png \
+		${STAGEDIR}${PREFIX}/share/icons/hicolor/${n}x${n}/apps/milton.png
+.endfor
 
 .include <bsd.port.mk>

graphics/milton/files/patch-CMakeLists.txt

@@ -40,7 +40,20 @@
      ${XINPUT_LIBRARY}
 -    ${SDL2DIR}/build/linux64/lib/libSDL2maind.a
 -    ${SDL2DIR}/build/linux64/lib/libSDL2d.a
-+    ${SDL2_LIBRARIES}
++    ${SDL2_LIBRARIES} SDL2_image
      ${CMAKE_THREAD_LIBS_INIT}
      ${CMAKE_DL_LIBS}
      )
+@@ -132,11 +132,8 @@ if(WIN32 OR APPLE)
+ endif()
+ 
+ add_custom_command(TARGET Milton POST_BUILD
+-  COMMAND ${CMAKE_COMMAND} -E copy
++  COMMAND icotool -x
+     ${CMAKE_CURRENT_LIST_DIR}/milton_icon.ico
+-    ${CMAKE_CURRENT_LIST_DIR}/third_party/Carlito.ttf
+-    ${CMAKE_CURRENT_LIST_DIR}/third_party/Carlito.LICENSE
+-    $<TARGET_FILE_DIR:Milton>
+ )
+ 
+ add_dependencies(Milton shadergen)

graphics/milton/files/patch-src_platform__linux.cc

@@ -0,0 +1,24 @@
+--- src/platform_linux.cc.orig	2019-03-15 04:11:43 UTC
++++ src/platform_linux.cc
+@@ -1,6 +1,8 @@
+ // Copyright (c) 2015 Sergio Gonzalez. All rights reserved.
+ // License: https://github.com/serge-rgb/milton#license
+ 
++#include <SDL_image.h>
++
+ #include "platform.h"
+ 
+ #include "common.h"
+@@ -318,5 +320,12 @@ platform_deinit(PlatformState* platform)
+ void
+ platform_setup_cursor(Arena* arena, PlatformState* platform)
+ {
++    SDL_Surface *surface;
+ 
++    surface = IMG_Load("milton.png");
++    if (surface == NULL)
++        return;
++
++    SDL_SetWindowIcon(platform->window, surface);
++    SDL_FreeSurface(surface);
+ }