Testing "Chainable Compositing Filters"

layer_comp.map

MAP
	#
	# layer_comp.map
	#
	# Lars Schylberg, 2022-02-23
	#
	# Testing "Chainable Compositing Filters" from RFC113
	#
	# Test command: map2img -m layer_comp.map -o layer_comp.png
	# tested with: MapServer version 7.7-dev, but should work with 7.4 and 7.6
	#
	# documentation from mapservers-users list
#
#  COMPFILTER
# The currently available filters are:
# - "blur(integer)"
# - "translate(integer,integer)"
# - "grayscale()"
# - "blacken()"
# - "whiten()"
# 
# The COMPOP values that can be used should be explicit 
# and are listed here:
# clear
# color-burn
# color-dodge
# contrast*
# darken
# difference
# dst
# dst-atop
# dst-in
# dst-out
# dst-over
# exclusion
# hard-light
# invert*
# invert-rgb*
# lighten
# minus*
# multiply
# overlay
# plus
# screen
# soft-light
# src
# src-atop
# src-in
# src-out
# src-over
# xor

# Operators marked with a star (*) will only 
# be supported when using an AGG backends and 
# when pixman support is not enabled, 
# and will fall back to “src-over” when this is not the case.
#
	
	
    NAME test_layer_comppipeline
    EXTENT 0 0 20 15
    SIZE 400 300
    UNITS DD
    IMAGECOLOR 200 200 200
#     CONFIG "MS_ERRORFILE" "/tmp/test.log"
    DEBUG 5

    OUTPUTFORMAT
      NAME "AGG"
      DRIVER AGG/PNG
      IMAGEMODE RGB
    END

    WEB
      IMAGEPATH "/tmp/ms_tmp/"
      IMAGEURL "/ms_tmp/"
      METADATA
        "wms_srs" "EPSG:3006 EPSG:4326 EPSG:3857"
        "ows_enable_request" "*"
        "ows_title" " test"
      END
    END

    PROJECTION
      "init=epsg:4326"
    END

	SYMBOL
		NAME "Tree"
		TYPE VECTOR
		POINTS
		  5 0
		  4 0
		  3 1
		  3 2
		  0 5
		  0 7
		  1 8
		  8 8
		  9 7
		  9 5
		  6 2
		  6 1
		  5 0
		  -99 -99
		  4 7
		  4 12
		  5 12
		  5 7
		END
	END

# Start of layer definitions
#
    LAYER
        NAME "lake"
        TYPE POLYGON
        FEATURE POINTS 10 5 15 10 5 10 10 5 END END
        STATUS ON
		COMPOSITE
			#first we render normal water color
			# OPACITY 100
		END
		COMPOSITE
			COMPFILTER "whiten()"
			COMPFILTER "blur(10)"
			COMPOP "soft-light"
			OPACITY 50
		END
		CLASS
			STYLE
				COLOR 156 192 249  # watercolor
			END
		END	
    END # Layer

    LAYER
        NAME "house"
        TYPE POLYGON
        FEATURE POINTS 4 5 4 6 5 6 5 5 4 5 END END
        STATUS ON
		COMPOSITE
			#create the shadow/blur effect by translating a blurred version of the layer
			COMPFILTER "grayscale()"
			COMPFILTER "translate(5,5)"
			COMPFILTER "blur(4)"
			OPACITY 50
		END
		COMPOSITE
			#and render the buildings themselves
			OPACITY 100
		END
		CLASS
			STYLE
				COLOR 128 128 128
				OUTLINECOLOR 0 0 0
				WIDTH 1
			END
		END
    END # Layer
    
    LAYER
        NAME "line-test"
        TYPE LINE
        FEATURE POINTS 14 5 18 10 END END
        STATUS ON
		COMPOSITE
			#create the shadow/blur effect by translating a blurred version of the layer
			# COMPFILTER "grayscale()"
			COMPFILTER "translate(5,5)"
			COMPFILTER "blur(5)"
			OPACITY 50
		END
		COMPOSITE
			OPACITY 100
		END
		CLASS
			STYLE
				COLOR 225 95 31
				WIDTH 2
			END
		END
    END # Layer

    LAYER
        NAME "point-symbol-test"
        TYPE POINT
        FEATURE POINTS 2 10 END END
        STATUS ON
		COMPOSITE
			#create the shadow/blur effect by translating a blurred version of the layer
			COMPFILTER "blacken()"
			COMPFILTER "translate(-6,-5)"
			COMPFILTER "blur(7)"
			OPACITY 50
		END
		COMPOSITE
			OPACITY 100
		END
		CLASS
			STYLE
				SYMBOL "Tree"
				SIZE 24
				COLOR 5 255 10
				WIDTH 2
			END
		END
    END # Layer
END # Map File