1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef mozilla_dom_ImageBitmapFormatUtils_h 8 #define mozilla_dom_ImageBitmapFormatUtils_h 9 10 #include "mozilla/UniquePtr.h" 11 #include "nsTArrayForwardDeclare.h" 12 13 namespace mozilla { 14 15 namespace layers { 16 class Image; 17 } 18 19 class ErrorResult; 20 21 namespace dom { 22 23 struct ChannelPixelLayout; 24 enum class ImageBitmapFormat : uint8_t; 25 26 typedef nsTArray<ChannelPixelLayout> ImagePixelLayout; 27 28 /* 29 * ImageUtils is a wrapper around layers::Image. It provides three unified 30 * methods to all sub-classes of layers::Image, which are: 31 * 32 * (1) GetFormat() converts the image's format into ImageBitmapFormat enum. 33 * (2) GetBufferLength() returns the number of bytes that are used to store 34 * the image's underlying raw data. 35 * 36 * In theory, the functionalities of this class could be merged into the 37 * interface of layers::Image. However, this is designed as a isolated wrapper 38 * because we don't want to pollute the layers::Image's interface with methods 39 * that are only meaningful to the ImageBitmap. 40 */ 41 class ImageUtils { 42 public: 43 class Impl; 44 ImageUtils() = delete; 45 ImageUtils(const ImageUtils&) = delete; 46 ImageUtils(ImageUtils&&) = delete; 47 ImageUtils& operator=(const ImageUtils&) = delete; 48 ImageUtils& operator=(ImageUtils&&) = delete; 49 50 explicit ImageUtils(layers::Image* aImage); 51 ~ImageUtils(); 52 53 ImageBitmapFormat GetFormat() const; 54 55 uint32_t GetBufferLength() const; 56 57 protected: 58 Impl* mImpl; 59 }; 60 61 } // namespace dom 62 } // namespace mozilla 63 64 #endif /* mozilla_dom_ImageBitmapFormatUtils_h */ 65