#    Copyright (C) 1995, 1996, 1997, 1998 Aladdin Enterprises.  All rights reserved.
# 
# This file is part of Aladdin Ghostscript.
# 
# Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
# or distributor accepts any responsibility for the consequences of using it,
# or for whether it serves any particular purpose or works at all, unless he
# or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
# License (the "License") for full details.
# 
# Every copy of Aladdin Ghostscript must include a copy of the License,
# normally in a plain ASCII text file named PUBLIC.  The License grants you
# the right to copy, modify and redistribute Aladdin Ghostscript, but only
# under certain conditions described in the License.  Among other things, the
# License requires that the copyright notice and this notice be preserved on
# all copies.


# makefile for PNG (Portable Network Graphics) code.
# Users of this makefile must define the following:
#	ZSRCDIR - the zlib source directory
#	ZGENDIR - the zlib generated intermediate file directory
#	ZOBJDIR - the zlib object directory
#	PNGSRCDIR - the source directory
#	PNGGENDIR - the generated intermediate file directory
#	PNGOBJDIR - the object directory
#	PNGVERSION - the library version number ("89", "90", "95", "96", "101")
#	SHARE_LIBPNG - 0 to compile libpng, 1 to share
#	LIBPNG_NAME - if SHARE_LIBPNG=1, the name of the shared library

# This partial makefile compiles the png library for use in the Ghostscript
# PNG drivers.  You can get the source code for this library from:
#   ftp://swrinde.nde.swri.edu/pub/png/src/
#   ftp://ftp.uu.net/graphics/png/src/
# Please see Ghostscript's `Make.htm' file for instructions about how to
# unpack these archives.
#
# When each version of Ghostscript is released, we copy the associated
# version of the png library to
#	ftp://ftp.cs.wisc.edu/ghost/3rdparty/
# for more convenient access.
#
# The makefile is known to work with the following library versions:
# 0.89, 0.90, 0.95, 0.96, 1.0.1, 1.0.2.  NOTE: the archive for libpng 0.95 may
# be inconsistent: if you have compilation problems, use an older version.
# Please see Ghostscript's `make.txt' file for instructions about how to
# unpack these archives.
#
# The specification for the PNG file format is available from:
#   http://www.group42.com/png.htm
#   http://www.w3.org/pub/WWW/TR/WD-png

# (Rename directories.)
PNGSRCDIR=$(PSRCDIR)
PNGVERSION=$(PVERSION)
PNGSRC=$(PNGSRCDIR)$(D)
PNGGEN=$(PNGGENDIR)$(D)
PNGOBJ=$(PNGOBJDIR)$(D)
PNGO_=$(O_)$(PNGOBJ)
ZGEN=$(ZGENDIR)$(D)
ZOBJ=$(ZOBJDIR)$(D)

# PI_ and PF_ are defined in gs.mak.
PNGCC=$(CC_) $(I_)$(PI_)$(_I) $(PF_)

# Define the name of this makefile.
LIBPNG_MAK=$(GLSRC)libpng.mak

png.clean: png.config-clean png.clean-not-config-clean

### WRONG.  MUST DELETE OBJ AND GEN FILES SELECTIVELY.
png.clean-not-config-clean:
	$(RM_) $(PNGOBJ)*.$(OBJ)

png.config-clean:
	$(RM_) $(PNGGEN)libpng*.dev

# We keep all of the PNG code in a separate directory so as not to
# inadvertently mix it up with Aladdin Enterprises' own code.
PDEP=$(AK)

png_1=$(PNGOBJ)png.$(OBJ) $(PNGOBJ)pngmem.$(OBJ) $(PNGOBJ)pngerror.$(OBJ)
png_2=$(PNGOBJ)pngtrans.$(OBJ) $(PNGOBJ)pngwrite.$(OBJ) $(PNGOBJ)pngwtran.$(OBJ) $(PNGOBJ)pngwutil.$(OBJ)

# libpng modules

$(PNGOBJ)png.$(OBJ): $(PNGSRC)png.c $(PDEP)
	$(PNGCC) $(PNGO_)png.$(OBJ) $(C_) $(PNGSRC)png.c

$(PNGOBJ)pngwio.$(OBJ): $(PNGSRC)pngwio.c $(PDEP)
	$(PNGCC) $(PNGO_)pngwio.$(OBJ) $(C_) $(PNGSRC)pngwio.c

$(PNGOBJ)pngmem.$(OBJ): $(PNGSRC)pngmem.c $(PDEP)
	$(PNGCC) $(PNGO_)pngmem.$(OBJ) $(C_) $(PNGSRC)pngmem.c

$(PNGOBJ)pngerror.$(OBJ): $(PNGSRC)pngerror.c $(PDEP)
	$(PNGCC) $(PNGO_)pngerror.$(OBJ) $(C_) $(PNGSRC)pngerror.c

$(PNGOBJ)pngtrans.$(OBJ): $(PNGSRC)pngtrans.c $(PDEP)
	$(PNGCC) $(PNGO_)pngtrans.$(OBJ) $(C_) $(PNGSRC)pngtrans.c

$(PNGOBJ)pngwrite.$(OBJ): $(PNGSRC)pngwrite.c $(PDEP)
	$(PNGCC) $(PNGO_)pngwrite.$(OBJ) $(C_) $(PNGSRC)pngwrite.c

$(PNGOBJ)pngwtran.$(OBJ): $(PNGSRC)pngwtran.c $(PDEP)
	$(PNGCC) $(PNGO_)pngwtran.$(OBJ) $(C_) $(PNGSRC)pngwtran.c

$(PNGOBJ)pngwutil.$(OBJ): $(PNGSRC)pngwutil.c $(PDEP)
	$(PNGCC) $(PNGO_)pngwutil.$(OBJ) $(C_) $(PNGSRC)pngwutil.c

# Define the version of libpng.dev that we are actually using.
$(PNGGEN)libpng.dev: $(MAKEFILE) $(PNGGEN)libpng_$(SHARE_LIBPNG).dev
	$(CP_) $(PNGGEN)libpng_$(SHARE_LIBPNG).dev $(PNGGEN)libpng.dev

# Define the shared version of libpng.
# Note that it requires libz, which must be searched *after* libpng.
$(PNGGEN)libpng_1.dev: $(MAKEFILE) $(LIBPNG_MAK) $(ECHOGS_XE) $(ZGEN)zlibe.dev
	$(SETMOD) $(PNGGEN)libpng_1 -lib $(LIBPNG_NAME)
	$(ADDMOD) $(PNGGEN)libpng_1 -include $(ZGEN)zlibe

# Define the non-shared version of libpng.
$(PNGGEN)libpng_0.dev: $(LIBPNG_MAK) $(ECHOGS_XE) $(png_1) $(png_2)\
 $(ZGEN)zlibe.dev $(PNGGEN)lpng$(PNGVERSION).dev
	$(SETMOD) $(PNGGEN)libpng_0 $(png_1)
	$(ADDMOD) $(PNGGEN)libpng_0 $(png_2)
	$(ADDMOD) $(PNGGEN)libpng_0 -include $(ZGEN)zlibe $(PNGGEN)lpng$(PNGVERSION)

$(PNGGEN)lpng89.dev: $(LIBPNG_MAK) $(ECHOGS_XE) $(PNGOBJ)pngwio.$(OBJ)
	$(SETMOD) $(PNGGEN)lpng89 $(PNGOBJ)pngwio.$(OBJ)

$(PNGGEN)lpng90.dev: $(LIBPNG_MAK) $(ECHOGS_XE) $(PNGOBJ)pngwio.$(OBJ) $(ZGEN)crc32.dev
	$(SETMOD) $(PNGGEN)lpng90 $(PNGOBJ)pngwio.$(OBJ) -include $(ZGEN)crc32

$(PNGGEN)lpng95.dev: $(LIBPNG_MAK) $(ECHOGS_XE) $(PNGOBJ)pngwio.$(OBJ) $(ZGEN)crc32.dev
	$(SETMOD) $(PNGGEN)lpng95 $(PNGOBJ)pngwio.$(OBJ) -include $(ZGEN)crc32

$(PNGGEN)lpng96.dev: $(LIBPNG_MAK) $(ECHOGS_XE) $(PNGOBJ)pngwio.$(OBJ) $(ZGEN)crc32.dev
	$(SETMOD) $(PNGGEN)lpng96 $(PNGOBJ)pngwio.$(OBJ) -include $(ZGEN)crc32

$(PNGGEN)lpng101.dev: $(LIBPNG_MAK) $(ECHOGS_XE) $(PNGOBJ)pngwio.$(OBJ) $(ZGEN)crc32.dev
	$(SETMOD) $(PNGGEN)lpng101 $(PNGOBJ)pngwio.$(OBJ) -include $(ZGEN)crc32