Makefile.cover_image

# Makefile.cover_image

# This file is part of Sin Forth
# http://programandala.net/en.program.sin_forth.html

# By Marcos Cruz (programandala.net)

# Last modified 202012111908
# See change log at the end of the file

# ==============================================================
# Requirements {{{1

# ImageMagick (by ImageMagick Studio LCC)
#   http://imagemagick.org

# img2pdf (by Johannes 'josch' Schauer)
#   https://gitlab.mister-muffin.de/josch/img2pdf

# ==============================================================
# Create the cover image {{{1

# ------------------------------------------------
# Create the canvas and texts of the cover image {{{2

font=Helvetica
background=lightgray
fill=black
strokewidth=4
subtitle_pointsize=48

tmp/$(cover).title.png:
	convert \
		-background transparent \
		-fill $(fill) \
		-font $(font) \
		-pointsize 96 \
		-size 1200x \
		-gravity east \
		caption:$(cover_title) \
		$@

tmp/$(cover).subtitle.png:
	convert \
		-background transparent \
		-fill $(fill) \
		-font $(font) \
		-pointsize $(subtitle_pointsize) \
		-size 1200x \
		-gravity east \
		caption:$(cover_subtitle) \
		$@

tmp/$(cover).author.png:
	convert \
		-background transparent \
		-fill $(fill) \
		-font $(font) \
		-pointsize 48 \
		-size 896x \
		-gravity east \
		caption:$(cover_author) \
		$@

# ------------------------------------------------
# Create the cover image {{{2

.PHONY: cover
cover: doc/$(cover).jpg

doc/$(cover).jpg: \
	tmp/$(cover).title.png \
	tmp/$(cover).subtitle.png \
	tmp/$(cover).author.png
	convert -size 1200x1600 canvas:$(background) $@
	composite -gravity east -geometry +048+000 tmp/$(cover).title.png $@ $@
	composite -gravity east -geometry +048+072 tmp/$(cover).subtitle.png $@ $@
	composite -gravity east -geometry +048+256 tmp/$(cover).author.png $@ $@

# ------------------------------------------------
# Convert the cover image to PDF {{{2

# This is needed in order to make sure the cover image ocuppies the whole page
# in the PDF versions of the book.

tmp/%.pdf: doc/%.jpg
	img2pdf --output $@ --border 0 $<

# ------------------------------------------------
# Create a thumb version of the cover image {{{2

.PHONY: thumb
thumb: doc/$(cover)_thumb.jpg

%_thumb.jpg: %.jpg
	convert $< -resize 190x $@

# ==============================================================
# Change log {{{1

# 2020-12-11: Start. Adapt the code from Solo Forth.