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Generate a possibly suitable marketing banner for the KaiStore

It wants a 240x130 pixel JPEG.  I've gone for rotating the screenshot
a bit because the store overlays text on the picture and I don't want
horizontal lines in the picture confusing the text.  I think the store
handles dimming the image, so the picture we produce is at full
brightness.

--- a/icons/icons.cmake

+++ b/icons/icons.cmake

@@ -138,6 +138,17 @@

       ${icon_bindir}/${name}-base.png)

   list(APPEND output_icon_files ${icon_bindir}/${name}-web.png)

+  # Shrink differently to an oblong for the KaiStore marketing

+  # banner.  This is dimmed behind the name of the application, so put

+  # it at a jaunty angle to avoid unfortunate interactions with the

+  # text.

+  add_custom_command(OUTPUT ${icon_bindir}/${name}-banner.jpg

+    COMMAND ${CONVERT} ${icon_bindir}/${name}-base.png

+      -crop 1:1+0+0 -rotate -10 +repage -shave 13% -resize 240 -crop x130+0+0

+      ${icon_bindir}/${name}-banner.jpg

+    DEPENDS ${icon_bindir}/${name}-base.png)

+  list(APPEND output_icon_files ${icon_bindir}/${name}-banner.jpg)

+

   # Make the base image for all the icons, by cropping out the most

   # interesting part of the whole screenshot.

   add_custom_command(OUTPUT ${icon_bindir}/${name}-ibase.png