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#!/bin/sh
case "$1" in
graphicsmagick)
# Version check
gm version | grep -F "$2"
# Create a small test image
gm convert -size 32x32 xc:white /tmp/gm-white.png
[ -f /tmp/gm-white.png ] || { echo "FAIL: PNG creation"; exit 1; }
# Identify the created image; verify format and dimensions
gm identify /tmp/gm-white.png | grep -E "PNG.*32x32"
# Convert to JPEG
gm convert /tmp/gm-white.png /tmp/gm-white.jpg
gm identify /tmp/gm-white.jpg | grep "JPEG"
# Resize: create a 64x64 image, resize to 16x16, confirm dimensions
gm convert -size 64x64 xc:blue -resize 16x16! /tmp/gm-small.png
gm identify /tmp/gm-small.png | grep -E "PNG.*16x16"
# Color: create a 1x1 red pixel, sample it back
gm convert -size 1x1 xc:red /tmp/gm-red.png
gm convert /tmp/gm-red.png -format '%[pixel:p{0,0}]' info: | grep -iE "red|ff0000"
# Draw: add text/annotate (exercises the font/draw engine)
gm convert -size 64x16 xc:white -font Helvetica -pointsize 10 \
-draw "text 2,12 'gm'" /tmp/gm-text.png 2>/dev/null || \
gm convert -size 64x16 xc:white \
-draw "text 2,12 'gm'" /tmp/gm-text.png
gm identify /tmp/gm-text.png | grep "PNG"
# Composite: overlay one image on another
gm composite -compose Over /tmp/gm-red.png /tmp/gm-white.png /tmp/gm-composite.png
gm identify /tmp/gm-composite.png | grep "PNG"
# TIFF round-trip: encode, then decode back to PNG at the same geometry
gm convert /tmp/gm-white.png /tmp/gm-white.tiff
gm identify /tmp/gm-white.tiff | grep "TIFF"
gm convert /tmp/gm-white.tiff /tmp/gm-back.png
gm identify /tmp/gm-back.png | grep -E "PNG.*32x32"
# PPM and GIF encoders (built-in codecs)
gm convert /tmp/gm-white.png /tmp/gm-white.ppm
gm identify /tmp/gm-white.ppm | grep -E "PNM|PPM"
gm convert /tmp/gm-white.png /tmp/gm-white.gif
gm identify /tmp/gm-white.gif | grep "GIF"
# Crop a sub-region and confirm the new geometry
gm convert /tmp/gm-white.png -crop 10x10+0+0 /tmp/gm-crop.png
gm identify /tmp/gm-crop.png | grep -E "PNG.*10x10"
# Rotate 90 degrees swaps width and height
gm convert -size 40x20 xc:white -rotate 90 /tmp/gm-rot.png
gm identify /tmp/gm-rot.png | grep -E "PNG.*20x40"
# Horizontal append of two images
gm convert /tmp/gm-white.png /tmp/gm-small.png +append /tmp/gm-app.png
gm identify /tmp/gm-app.png | grep "PNG"
# mogrify rewrites the file in place
cp /tmp/gm-white.png /tmp/gm-mog.png
gm mogrify -resize 20x20! /tmp/gm-mog.png
gm identify /tmp/gm-mog.png | grep -E "PNG.*20x20"
rm -f /tmp/gm-white.png /tmp/gm-white.jpg /tmp/gm-small.png \
/tmp/gm-red.png /tmp/gm-text.png /tmp/gm-composite.png \
/tmp/gm-white.tiff /tmp/gm-back.png /tmp/gm-white.ppm \
/tmp/gm-white.gif /tmp/gm-crop.png /tmp/gm-rot.png /tmp/gm-app.png \
/tmp/gm-mog.png
;;
esac
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