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#
# Simple CMake -P script to rasterize an SVG file to a png image.
#
# Usage:
#
# cmake -DSVGFILE=<SVG file>
# [ -DPNGFILE=<PNG file> ]
# -DCONVERTER=<wkhtmltoimage executable>
# -DREMOVESVG=<bool>
# -P RasterizeSVG.cmake
#
# SVGFILE is the input SVG file, PNGFILE is the output png file path. If
# PNGFILE is not specified, it will have the same basename as SVGFILE, but with
# a .png extension.
#
# The script calls wkhtmltoimage with the relevant parameters to produce
# a png with the same dimensions as the input file's bounding box. The path to
# the wkhtmltoimage executable for your system must be specified in CONVERTER.
#
# If REMOVESVG is true, the input SVG file will be removed upon successful
# conversion.
function(get_dims_from_svg filename width_var height_var)
set(${width_var} "" PARENT_SCOPE)
set(${height_var} "" PARENT_SCOPE)
# wkhtmltoimage doesn't do a great job of restricting the output image to the
# input dimensions, so scan the header of the file for the dimensions, which
# appear as '<svg ... width="XXX" ... height="XXX" ... >' in the root <svg>
# element. This should appear in the first 1KB, so don't read the whole file:
file(READ "${filename}" HEADER LIMIT 1024)
if (NOT HEADER)
message("The input file is empty: ${filename}")
return()
endif()
string(REGEX REPLACE
"^.*<svg[^>]+width=\"([^\"]+)\".*$" "\\1"
WIDTH "${HEADER}")
string(REGEX REPLACE
"^.*<svg[^>]+height=\"([^\"]+)\".*$" "\\1"
HEIGHT "${HEADER}")
if (NOT WIDTH OR NOT HEIGHT)
message("Width or height information missing from first KB of input. "
"Header:\n{HEADER}")
return()
endif()
set(${width_var} "${WIDTH}" PARENT_SCOPE)
set(${height_var} "${HEIGHT}" PARENT_SCOPE)
endfunction()
if(NOT CONVERTER)
message(FATAL_ERROR "CONVERTER is not specified!")
endif()
if (NOT SVGFILE)
message(FATAL_ERROR "SVGFILE not set!")
endif()
get_filename_component(BASENAME "${SVGFILE}" NAME_WE)
get_filename_component(WORKPATH "${SVGFILE}" PATH)
set(WIDTH)
set(HEIGHT)
get_dims_from_svg("${SVGFILE}" WIDTH HEIGHT)
if (NOT WIDTH OR NOT HEIGHT)
message(FATAL_ERROR "Could not determine input image dimensions.")
endif()
if(NOT PNGFILE)
set(PNGFILE "${WORKPATH}/${BASENAME}.png")
endif()
# Remove any old output (in case conversion fails)
file(REMOVE "${PNGFILE}")
# Rasterize SVGFILE --> png
execute_process(
COMMAND "${CONVERTER}"
--crop-w ${WIDTH} --crop-h ${HEIGHT} "${SVGFILE}" "${PNGFILE}"
RESULT_VARIABLE EXITCODE
OUTPUT_VARIABLE ERRORSTR)
if(NOT ${EXITCODE} EQUAL 0)
message(FATAL_ERROR "SVG->PNG conversion exited with status ${EXITCODE}:\n"
"${ERRORSTR}")
endif()
if(REMOVESVG)
file(REMOVE "${SVGFILE}")
endif()
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