android/source/src/java/org/mozilla/gecko/gfx/CairoUtils.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.mozilla.gecko.gfx;
   7
   8 import android.graphics.Bitmap;
   9
  10 /**
  11  * Utility methods useful when displaying Cairo bitmaps using OpenGL ES.
  12  */
  13 public class CairoUtils {
  14     private CairoUtils() { /* Don't call me. */ }
  15
  16     public static int bitsPerPixelForCairoFormat(int cairoFormat) {
  17         switch (cairoFormat) {
  18             case CairoImage.FORMAT_A1:          return 1;
  19             case CairoImage.FORMAT_A8:          return 8;
  20             case CairoImage.FORMAT_RGB16_565:   return 16;
  21             case CairoImage.FORMAT_RGB24:       return 24;
  22             case CairoImage.FORMAT_ARGB32:      return 32;
  23             default:
  24                 throw new RuntimeException("Unknown Cairo format");
  25         }
  26     }
  27
  28     public static int bitmapConfigToCairoFormat(Bitmap.Config config) {
  29         if (config == null)
  30             return CairoImage.FORMAT_ARGB32;    /* Droid Pro fix. */
  31
  32         switch (config) {
  33             case ALPHA_8:   return CairoImage.FORMAT_A8;
  34             case ARGB_4444: throw new RuntimeException("ARGB_444 unsupported");
  35             case ARGB_8888: return CairoImage.FORMAT_ARGB32;
  36             case RGB_565:   return CairoImage.FORMAT_RGB16_565;
  37             default:        throw new RuntimeException("Unknown Skia bitmap config");
  38         }
  39     }
  40
  41     public static Bitmap.Config cairoFormatTobitmapConfig(int format) {
  42         switch (format) {
  43             case CairoImage.FORMAT_A8:        return Bitmap.Config.ALPHA_8;
  44             case CairoImage.FORMAT_ARGB32:    return Bitmap.Config.ARGB_8888;
  45             case CairoImage.FORMAT_RGB16_565: return Bitmap.Config.RGB_565;
  46             default:
  47                 throw new RuntimeException("Unknown CairoImage format");
  48         }
  49     }
  50 }
  51