Add --disable-png configure option.

2 files changed, 61 insertions, 2 deletions

diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am
index 4ce01ff..4f427d0 100644
--- a/libdimension/Makefile.am
+++ b/libdimension/Makefile.am
@@ -63,7 +63,6 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS)                            \
                           object.c                                             \
                           perspective.c                                        \
                           phong.c                                              \
-                          png.c                                                \
                           point_light.c                                        \
                           progress.c                                           \
                           raytrace.c                                           \
@@ -73,7 +72,14 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS)                            \
                           sphere.c                                             \
                           texture.c
 libdimension_la_LDFLAGS = -version-info 0:0:0 $(AM_LDFLAGS)
-libdimension_la_LIBADD  = -lm -lpthread -lpng
+libdimension_la_LIBADD  = -lm -lpthread
+
+if PNG
+libdimension_la_SOURCES += png.c
+libdimension_la_LIBADD  += -lpng
+else
+libdimension_la_SOURCES += png-stubs.c
+endif
 
 if GL
 libdimension_la_SOURCES += gl.c
diff --git a/libdimension/png-stubs.c b/libdimension/png-stubs.c
new file mode 100644
index 0000000..eca7697
--- /dev/null
+++ b/libdimension/png-stubs.c
@@ -0,0 +1,53 @@
+/*************************************************************************
+ * Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimension.h"
+
+/* Stubs for PNG functions when compiled with --disable-png */
+
+int
+dmnsn_png_optimize_canvas(dmnsn_canvas *canvas)
+{
+  return 1;
+}
+
+int
+dmnsn_png_write_canvas(const dmnsn_canvas *canvas, FILE *file)
+{
+  return 1;
+}
+
+dmnsn_progress *
+dmnsn_png_write_canvas_async(const dmnsn_canvas *canvas, FILE *file)
+{
+  return NULL;
+}
+
+dmnsn_canvas *
+dmnsn_png_read_canvas(FILE *file)
+{
+  return NULL;
+}
+
+dmnsn_progress *
+dmnsn_png_read_canvas_async(dmnsn_canvas **canvas, FILE *file)
+{
+  return NULL;
+}