Updated libvips plugin

Author: dreamsxin

libvips/README.md

@@ -71,7 +71,7 @@ Look up an unbuilt @operation in the cache. If we get a hit, ref and return the
 
 ## Extending VIPS
 
-* 自定义操作 `operation`
+* 编写插件 `negative`
 
 ```c
 typedef struct _Negative {
@@ -192,4 +192,60 @@ static int negative_generate( VipsRegion *or, void *vseq, void *a, void *b, gboo
 
   return( 0 );
 }
+```
+
+Makefile:
+```Makefile
+# Makefile for vips plugin 
+
+# Object files
+OBJS = negative.o 
+
+# Source files
+SRC = $(OBJS:.o=.c) 
+
+# Headers
+HEADERS = 
+
+# All
+TAGS = $(SRC) $(HEADERS)
+
+#linux
+CFLAGS += -shared -fPIC 
+#solaris
+#CXXFLAGS += -Xa -Kpic 
+CPPFLAGS += `pkg-config vips --cflags`
+LDFLAGS += `pkg-config vips --libs`
+OUT = vips-negative.plg
+
+release: $(OUT)
+debug: $(OUT)
+
+.PHONY: debug  
+debug: CFLAGS += -g
+
+.PHONY: release  
+release: CFLAGS += -O3
+
+$(OUT): $(OBJS)
+	$(CC) -o $(OUT) -shared $(OBJS)
+#solaris
+#	ld -o $(OUT) -G $(OBJS)
+#	vips -plugin ./$(OUT) resample in.v in2.v out.v 0.1 20 1 1 0
+#	vips -plugin ./$(OUT) scale_par matrix.mat out.mat 2.0
+
+clean: 
+	$(RM) $(OBJS) 
+
+tags: $(TAGS)
+	ctags $(TAGS)
+
+# version as MAJOR.MINOR
+VIPS_VERSION = $(shell pkg-config vips --modversion | \
+	         awk '{split($$1,a,"."); print a[1]"."a[2]}')
+PLUGIN_DIR = $(VIPSHOME)/lib/vips-plugins-$(VIPS_VERSION)
+
+install: $(OUT)
+	-mkdir -p $(PLUGIN_DIR)
+	-cp $(OUT) $(PLUGIN_DIR)
 ```