1 files changed, 40 insertions, 0 deletions
diff --git a/image/lum_alpha.go b/image/lum_alpha.go
new file mode 100644
index 000000000..7d9686a36
--- /dev/null
+++ b/image/lum_alpha.go
@@ -0,0 +1,40 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package image
+
+type fmtLuminanceAlpha struct{}
+
+func (fmtLuminanceAlpha) String() string                 { return "LuminanceAlpha" }
+func (fmtLuminanceAlpha) Check(d []byte, w, h int) error { return checkSize(d, w, h, 16) }
+
+// LuminanceAlpha returns a format containing an 8-bit luminance and alpha
+// channel per pixel.
+func LuminanceAlpha() Format { return fmtLuminanceAlpha{} }
+
+func init() {
+	RegisterConverter(LuminanceAlpha(), RGBA(),
+		func(src []byte, width, height int) ([]byte, error) {
+			dst, i, j := make([]byte, width*height*4), 0, 0
+			for y := 0; y < height; y++ {
+				for x := 0; x < width; x++ {
+					dst[j+0], dst[j+1], dst[j+2], dst[j+3] = src[i+0], src[i+0], src[i+0], src[i+1]
+					i += 2
+					j += 4
+				}
+			}
+
+			return dst, nil
+		})
+}