Fix desktop SVG icon not resizing properly

Workaround for librsvg bug

desktop/CMakeLists.txt

@@ -1,28 +1,32 @@
 cmake_minimum_required(VERSION 2.8)
 
-set(COLOBOT_ICON_FILE colobot.svg)
+set(COLOBOT_ICON_FILE ${CMAKE_CURRENT_SOURCE_DIR}/colobot.svg)
 
 # Render SVG icon in various sizes
 find_program(RSVG_CONVERT rsvg-convert)
-if(RSVG_CONVERT AND (PLATFORM_GNU OR PLATFORM_MACOSX))
-    add_custom_target(png-icons ALL)
-    foreach(PNGSIZE 512 256 128 48 32 16)
+find_program(XMLSTARLET xmlstarlet)
+if(RSVG_CONVERT AND XMLSTARLET AND (PLATFORM_GNU OR PLATFORM_MACOSX))
+    add_custom_target(png-icons ALL DEPENDS ${COLOBOT_ICON_FILE})
+
+    foreach(PNG_SIZE 512 256 128 48 32 16)
+        # Using xmlstarlet to edit SVG file is a workaround for rsvg-convert bug (see: https://bugzilla.gnome.org/show_bug.cgi?id=762115)
         add_custom_command(
-            OUTPUT ${PNGSIZE}/colobot.png
-            COMMAND mkdir -p ${PNGSIZE}
-            COMMAND ${RSVG_CONVERT} -w ${PNGSIZE} -h ${PNGSIZE} ${CMAKE_CURRENT_SOURCE_DIR}/${COLOBOT_ICON_FILE} > ${PNGSIZE}/colobot.png
+            OUTPUT ${PNG_SIZE}/colobot.png
+            COMMAND mkdir -p ${PNG_SIZE}
+            COMMAND ${XMLSTARLET} ed -u /*/@width -v ${PNG_SIZE} -u /*/@height -v ${PNG_SIZE} ${COLOBOT_ICON_FILE} > ${PNG_SIZE}/colobot.svg
+            COMMAND ${RSVG_CONVERT} ${PNG_SIZE}/colobot.svg -o ${PNG_SIZE}/colobot.png
             )
-        add_custom_target(png-icon-${PNGSIZE} ALL DEPENDS ${PNGSIZE}/colobot.png)
-        add_dependencies(png-icons png-icon-${PNGSIZE})
+        add_custom_target(png-icon-${PNG_SIZE} ALL DEPENDS ${PNG_SIZE}/colobot.png)
+        add_dependencies(png-icons png-icon-${PNG_SIZE})
 
         if(PLATFORM_GNU)
             install(
-                FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGSIZE}/colobot.png
-                DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/${PNGSIZE}x${PNGSIZE}/apps/
+                FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNG_SIZE}/colobot.png
+                DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/${PNG_SIZE}x${PNG_SIZE}/apps/
                 )
         endif()
         # Prepare the ICNS icon generation
-        list(APPEND ICNS_SRCS "${PNGSIZE}/colobot.png")
+        list(APPEND ICNS_SRCS "${PNG_SIZE}/colobot.png")
     endforeach()
 
     # Pack icon for Mac OS
@@ -54,7 +58,7 @@ if(PLATFORM_GNU)
 
     # Install Icon
     install(
-        FILES ${CMAKE_CURRENT_SOURCE_DIR}/${COLOBOT_ICON_FILE}
+        FILES ${COLOBOT_ICON_FILE}
         DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/scalable/apps/
         )
 

desktop/colobot.svg

@@ -12,6 +12,7 @@
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    width="32"
    height="32"
+   viewBox="0 0 32 32"
    id="svg2"
    version="1.1"
    inkscape:version="0.48.4 r9939"