From ce26d6cbb550039516432993894d65660b7c9e06 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Draszik?= <andre.draszik@jci.com>
Date: Tue, 27 Feb 2018 13:43:04 +0000
Subject: [PATCH] jdk: Allow using a system-installed libpng
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Patch stolen (and some typos corrected) from debian patch,
which itself was a backport from:
  http://hg.openjdk.java.net/jdk9/jdk9/rev/bfc1c131e540
  http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/5e503831b142

Issues fixed on top of debian patch:
  * the default when --with-libpng= is not given works
  * using the bundled libpng works

Upstream-Status: Backport
Signed-off-by: André Draszik <andre.draszik@jci.com>
Signed-off-by: Richard Leitner <richard.leitner@skidata.com>

---
 jdk/make/lib/Awt2dLibraries.gmk                      | 12 +++++++++---
 .../native/sun/awt/splashscreen/splashscreen_png.c   |  3 +--
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/jdk/make/lib/Awt2dLibraries.gmk b/jdk/make/lib/Awt2dLibraries.gmk
index 7fffcafc..7f42e09c 100644
--- a/jdk/make/lib/Awt2dLibraries.gmk
+++ b/jdk/make/lib/Awt2dLibraries.gmk
@@ -1155,7 +1155,6 @@ endif
 ifndef BUILD_HEADLESS_ONLY
   LIBSPLASHSCREEN_DIRS := \
     $(JDK_TOPDIR)/src/share/native/sun/awt/image/jpeg \
-    $(JDK_TOPDIR)/src/share/native/sun/awt/libpng \
     $(JDK_TOPDIR)/src/share/native/sun/awt/splashscreen
 
   ifeq ($(USE_EXTERNAL_LIBGIF), true)
@@ -1172,6 +1171,13 @@ ifndef BUILD_HEADLESS_ONLY
     LIBJPEG_CFLAGS := -I$(JDK_TOPDIR)/src/share/native/sun/awt/image/jpeg
   endif
 
+  ifeq ($(USE_EXTERNAL_LIBPNG), true)
+    LIBPNG_LDFLAGS := -lpng
+  else
+    LIBSPLASHSCREEN_DIRS += $(JDK_TOPDIR)/src/share/native/sun/awt/libpng
+    LIBPNG_CFLAGS := -I$(JDK_TOPDIR)/src/share/native/sun/awt/libpng
+  endif
+
   ifneq ($(OPENJDK_TARGET_OS), macosx)
     LIBSPLASHSCREEN_DIRS += $(JDK_TOPDIR)/src/$(OPENJDK_TARGET_OS_API_DIR)/native/sun/awt/splashscreen
   else
@@ -1229,12 +1235,12 @@ ifndef BUILD_HEADLESS_ONLY
       LANG := C, \
       OPTIMIZATION := LOW, \
       CFLAGS := $(LIBSPLASHSCREEN_CFLAGS) $(CFLAGS_JDKLIB) \
-                $(GIFLIB_CFLAGS) $(LIBJPEG_CFLAGS), \
+                $(GIFLIB_CFLAGS) $(LIBJPEG_CFLAGS) $(LIBPNG_CFLAGS), \
       MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libsplashscreen/mapfile-vers, \
       LDFLAGS := $(LDFLAGS_JDKLIB) \
           $(call SET_SHARED_LIBRARY_ORIGIN), \
       LDFLAGS_SUFFIX := $(LIBSPLASHSCREEN_LDFLAGS_SUFFIX) $(LIBZ) \
-                        $(GIFLIB_LDFLAGS) $(LIBJPEG_LDFLAGS), \
+                        $(GIFLIB_LDFLAGS) $(LIBJPEG_LDFLAGS) $(LIBPNG_LDFLAGS), \
       LDFLAGS_SUFFIX_solaris := -lc, \
       VERSIONINFO_RESOURCE := $(JDK_TOPDIR)/src/windows/resource/version.rc, \
       RC_FLAGS := $(RC_FLAGS) \
diff --git a/jdk/src/share/native/sun/awt/splashscreen/splashscreen_png.c b/jdk/src/share/native/sun/awt/splashscreen/splashscreen_png.c
index 3599433e..5bf002ea 100644
--- a/jdk/src/share/native/sun/awt/splashscreen/splashscreen_png.c
+++ b/jdk/src/share/native/sun/awt/splashscreen/splashscreen_png.c
@@ -25,8 +25,7 @@
 
 #include "splashscreen_impl.h"
 
-#include "../libpng/png.h"
-
+#include <png.h>
 #include <setjmp.h>
 
 #define SIG_BYTES 8