1 files changed, 51 insertions, 0 deletions
diff --git a/android/source/src/java/org/mozilla/gecko/gfx/CairoUtils.java b/android/source/src/java/org/mozilla/gecko/gfx/CairoUtils.java
new file mode 100644
index 000000000..e0db6530d
--- /dev/null
+++ b/android/source/src/java/org/mozilla/gecko/gfx/CairoUtils.java
@@ -0,0 +1,51 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.gfx;
+
+import android.graphics.Bitmap;
+
+/**
+ * Utility methods useful when displaying Cairo bitmaps using OpenGL ES.
+ */
+public class CairoUtils {
+    private CairoUtils() { /* Don't call me. */ }
+
+    public static int bitsPerPixelForCairoFormat(int cairoFormat) {
+        switch (cairoFormat) {
+            case CairoImage.FORMAT_A1:          return 1;
+            case CairoImage.FORMAT_A8:          return 8;
+            case CairoImage.FORMAT_RGB16_565:   return 16;
+            case CairoImage.FORMAT_RGB24:       return 24;
+            case CairoImage.FORMAT_ARGB32:      return 32;
+            default:
+                throw new RuntimeException("Unknown Cairo format");
+        }
+    }
+
+    public static int bitmapConfigToCairoFormat(Bitmap.Config config) {
+        if (config == null)
+            return CairoImage.FORMAT_ARGB32;    /* Droid Pro fix. */
+
+        switch (config) {
+            case ALPHA_8:   return CairoImage.FORMAT_A8;
+            case ARGB_4444: throw new RuntimeException("ARGB_444 unsupported");
+            case ARGB_8888: return CairoImage.FORMAT_ARGB32;
+            case RGB_565:   return CairoImage.FORMAT_RGB16_565;
+            default:        throw new RuntimeException("Unknown Skia bitmap config");
+        }
+    }
+
+    public static Bitmap.Config cairoFormatTobitmapConfig(int format) {
+        switch (format) {
+            case CairoImage.FORMAT_A8:        return Bitmap.Config.ALPHA_8;
+            case CairoImage.FORMAT_ARGB32:    return Bitmap.Config.ARGB_8888;
+            case CairoImage.FORMAT_RGB16_565: return Bitmap.Config.RGB_565;
+            default:
+                throw new RuntimeException("Unknown CairoImage format");
+        }
+    }
+}
+