build/imagemagick.mk

   1 IM_PREFIX :=
   2
   3 # extract alpha channel
   4 %_alpha.png: %.png
   5         $(Q)$(IM_PREFIX)convert $< -alpha Extract +matte +dither -colors 8 $@
   6
   7 # extract RGB channels
   8 %_rgb.png: %.png
   9         $(Q)$(IM_PREFIX)convert $< -background white -flatten +matte +dither -colors 64 $@
  10
  11 # tile both images
  12 %_tile.png: %_alpha.png %_rgb.png
  13         $(Q)$(IM_PREFIX)montage -tile 2x1 -geometry +0+0 $^ -depth 8 $@
  14
  15 # Convert a raster graphic file to 8 bit BMP.
  16 #
  17 # Arguments: OUTFILES, OUTPATTERN, INPATTERN, [PRE_OPTIONS], [POST_OPTIONS]
  18 define convert-to-bmp
  19
  20 $(1): $(2): $(3) | $$(dir $$(firstword $(1)))/dirstamp
  21         @$$(NQ)echo "  BMP     $$@"
  22         $$(Q)$$(IM_PREFIX)convert $$< $(4) +dither -compress none -type optimize -colors 256 $(5) bmp3:$$@
  23
  24 endef
  25
  26 # Convert a raster graphic file to 8 bit BMP with white background.
  27 #
  28 # Arguments: OUTFILES, OUTPATTERN, INPATTERN, [PRE_OPTIONS], [POST_OPTIONS]
  29 define convert-to-bmp-white
  30
  31 $(1): $(2): $(3) | $$(dir $$(firstword $(1)))/dirstamp
  32         @$$(NQ)echo "  BMP     $$@"
  33         $$(Q)$$(IM_PREFIX)convert $$< $(4) -background white -layers flatten +matte +dither -compress none -type optimize -colors 256 $(5) bmp3:$$@
  34
  35 endef
  36
  37 # Convert a raster graphic file to 8 bit BMP with white background.
  38 #
  39 # Arguments: OUTFILES, OUTPATTERN, INPATTERN, [PRE_OPTIONS], [POST_OPTIONS]
  40 define convert-to-bmp-half
  41
  42 $(1): $(2): $(3) | $$(dir $$(firstword $(1)))/dirstamp
  43         @$$(NQ)echo "  BMP     $$@"
  44         @$$(NQ)echo "  BMP     $$(@:1.bmp=2.bmp)"
  45         $$(Q)$$(IM_PREFIX)convert $$< $(4) -layers flatten +matte +dither -compress none -type optimize -colors 256 -crop '50%x100%' -scene 1 bmp3:$$(@:1.bmp=%d.bmp)
  46
  47 endef