Merge pull request #378 from go-vgo/bitmap-pr

Update README.md and add more image function

README.md

@@ -226,7 +226,6 @@ import (
   "fmt"
 
   "github.com/go-vgo/robotgo"
-  "github.com/vcaesar/gcv"
 )
 
 func main() {
@@ -251,6 +250,23 @@ func main() {
 
   robotgo.SaveBitmap(bitmap, "test.png")
 }
+```
+
+#### [OpenCV](https://github.com/vcaesar/gcv)
+
+```Go
+package main
+
+import (
+  "fmt"
+
+  "github.com/go-vgo/robotgo"
+  "github.com/vcaesar/gcv"
+)
+
+func main() {
+  opencv()
+}
 
 func opencv() {
   name := "test.png"

README_zh.md

@@ -224,7 +224,6 @@ import (
 	"fmt"
 
 	"github.com/go-vgo/robotgo"
-  "github.com/vcaesar/gcv"
 )
 
 func main() {
@@ -249,6 +248,23 @@ func main() {
 
   robotgo.SaveBitmap(bitmap, "test.png")
 }
+```
+
+#### [OpenCV](https://github.com/vcaesar/gcv)
+
+```Go
+package main
+
+import (
+  "fmt"
+
+  "github.com/go-vgo/robotgo"
+  "github.com/vcaesar/gcv"
+)
+
+func main() {
+  opencv()
+}
 
 func opencv() {
   name := "test.png"

img.go

@@ -72,6 +72,21 @@ func ByteToImg(b []byte) (image.Image, error) {
 	return imgo.ByteToImg(b)
 }
 
+// ImgSize get the file image size
+func ImgSize(path string) (int, int, error) {
+	return imgo.GetSize(path)
+}
+
+// Width return the image.Image width
+func Width(img image.Image) int {
+	return img.Bounds().Max.X
+}
+
+// Height return the image.Image height
+func Height(img image.Image) int {
+	return img.Bounds().Max.Y
+}
+
 // RGBAToBitmap convert the standard image.RGBA to Bitmap
 func RGBAToBitmap(r1 *image.RGBA) (bit Bitmap) {
 	bit.Width = r1.Bounds().Size().X