Add support for *.ico format

This is intended to be used for website favicons. This commit embeds the
image only in one size while the ico format can handle multiple of them.

2 files changed, 29 insertions, 12 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa37a4e..341e7b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,24 +10,39 @@ set(formats
 	pdf
 	svg
 	png
+	ico
 )
 
 foreach(icon ${icons})
 	foreach(format ${formats})
 		set(source "${CMAKE_CURRENT_SOURCE_DIR}/icons/${icon}.svg")
 		set(sink "${CMAKE_CURRENT_BINARY_DIR}/icons/${format}/${icon}.${format}")
-		add_custom_command(
-			OUTPUT
-				${sink}
-			COMMAND
-				SELF_CALL=xxx # https://gitlab.com/inkscape/inkscape/-/issues/4716
-				inkscape
-				--export-type=${format}
-				--export-filename=${sink}
-				${source}
-			DEPENDS
-				${source}
-		)
+		if(format STREQUAL ico)
+			set(intermediate "${CMAKE_CURRENT_BINARY_DIR}/icons/png/${icon}.png")
+			add_custom_command(
+				OUTPUT
+					${sink}
+				COMMAND
+					convert
+					${intermediate}
+					${sink}
+				DEPENDS
+					${intermediate}
+			)
+		else()
+			add_custom_command(
+				OUTPUT
+					${sink}
+				COMMAND
+					SELF_CALL=xxx # https://gitlab.com/inkscape/inkscape/-/issues/4716
+					inkscape
+					--export-type=${format}
+					--export-filename=${sink}
+					${source}
+				DEPENDS
+					${source}
+			)
+		endif()
 		add_custom_target(
 			"icon-${icon}-${format}"
 			ALL
diff --git a/README.md b/README.md
index 1f64306..3e34b06 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ output formats.
 - [Inkscape][1]
 - [CMake][2]
 - [Ninja][3]
+- [ImageMagick][4]
 
 ## Usage
 
@@ -40,3 +41,4 @@ The results are placed inside the `build` folder.
 [1]: https://inkscape.org
 [2]: https://cmake.org
 [3]: https://ninja-build.org
+[4]: https://imagemagick.org