Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       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             : #ifndef mozilla_image_SurfaceFlags_h
       7             : #define mozilla_image_SurfaceFlags_h
       8             : 
       9             : #include "imgIContainer.h"
      10             : #include "mozilla/TypedEnumBits.h"
      11             : 
      12             : namespace mozilla {
      13             : namespace image {
      14             : 
      15             : /**
      16             :  * Flags that change the output a decoder generates. Because different
      17             :  * combinations of these flags result in logically different surfaces, these
      18             :  * flags must be taken into account in SurfaceCache lookups.
      19             :  */
      20             : enum class SurfaceFlags : uint8_t
      21             : {
      22             :   NO_PREMULTIPLY_ALPHA     = 1 << 0,
      23             :   NO_COLORSPACE_CONVERSION = 1 << 1
      24             : };
      25         110 : MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(SurfaceFlags)
      26             : 
      27             : /**
      28             :  * @return the default set of surface flags.
      29             :  */
      30             : inline SurfaceFlags
      31         507 : DefaultSurfaceFlags()
      32             : {
      33         507 :   return SurfaceFlags();
      34             : }
      35             : 
      36             : /**
      37             :  * Given a set of imgIContainer FLAG_* flags, returns a set of SurfaceFlags with
      38             :  * the corresponding flags set.
      39             :  */
      40             : inline SurfaceFlags
      41         109 : ToSurfaceFlags(uint32_t aFlags)
      42             : {
      43         109 :   SurfaceFlags flags = DefaultSurfaceFlags();
      44         109 :   if (aFlags & imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA) {
      45           0 :     flags |= SurfaceFlags::NO_PREMULTIPLY_ALPHA;
      46             :   }
      47         109 :   if (aFlags & imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION) {
      48           0 :     flags |= SurfaceFlags::NO_COLORSPACE_CONVERSION;
      49             :   }
      50         109 :   return flags;
      51             : }
      52             : 
      53             : /**
      54             :  * Given a set of SurfaceFlags, returns a set of imgIContainer FLAG_* flags with
      55             :  * the corresponding flags set.
      56             :  */
      57             : inline uint32_t
      58           0 : FromSurfaceFlags(SurfaceFlags aFlags)
      59             : {
      60           0 :   uint32_t flags = imgIContainer::DECODE_FLAGS_DEFAULT;
      61           0 :   if (aFlags & SurfaceFlags::NO_PREMULTIPLY_ALPHA) {
      62           0 :     flags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
      63             :   }
      64           0 :   if (aFlags & SurfaceFlags::NO_COLORSPACE_CONVERSION) {
      65           0 :     flags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION;
      66             :   }
      67           0 :   return flags;
      68             : }
      69             : 
      70             : } // namespace image
      71             : } // namespace mozilla
      72             : 
      73             : #endif // mozilla_image_SurfaceFlags_h