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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /dom/canvas/ImageUtils.h | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/canvas/ImageUtils.h')
-rw-r--r-- | dom/canvas/ImageUtils.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/dom/canvas/ImageUtils.h b/dom/canvas/ImageUtils.h new file mode 100644 index 000000000..b64c33704 --- /dev/null +++ b/dom/canvas/ImageUtils.h @@ -0,0 +1,73 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et cindent: */ +/* 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/. */ + +#ifndef mozilla_dom_ImageBitmapFormatUtils_h +#define mozilla_dom_ImageBitmapFormatUtils_h + +#include "mozilla/UniquePtr.h" +#include "nsTArrayForwardDeclare.h" + +namespace mozilla { + +namespace layers { +class Image; +} + +class ErrorResult; + +namespace dom { + +struct ChannelPixelLayout; +enum class ImageBitmapFormat : uint32_t; + +typedef nsTArray<ChannelPixelLayout> ImagePixelLayout; + +/* + * ImageUtils is a wrapper around layers::Image. It provides three unified + * methods to all sub-classes of layers::Image, which are: + * + * (1) GetFormat() converts the image's format into ImageBitmapFormat enum. + * (2) GetBufferLength() returns the number of bytes that are used to store + * the image's underlying raw data. + * (3) MapDataInto() writes the image's underlying raw data into a given + * ArrayBuffer in the given format. (If the given format is different from + * the existing format, the ImageUtils uses the ImageBitmapFormatUtils to + * performa color conversion.) + * + * In theory, the functionalities of this class could be merged into the + * interface of layers::Image. However, this is designed as a isolated wrapper + * because we don't want to pollute the layers::Image's interface with methods + * that are only meaningful to the ImageBitmap. + */ +class ImageUtils +{ +public: + class Impl; + ImageUtils() = delete; + ImageUtils(const ImageUtils&) = delete; + ImageUtils(ImageUtils&&) = delete; + ImageUtils& operator=(const ImageUtils&) = delete; + ImageUtils& operator=(ImageUtils&&) = delete; + + explicit ImageUtils(layers::Image* aImage); + ~ImageUtils(); + + ImageBitmapFormat GetFormat() const; + + uint32_t GetBufferLength() const; + + UniquePtr<ImagePixelLayout> + MapDataInto(uint8_t* aBuffer, uint32_t aOffset, uint32_t aBufferLength, + ImageBitmapFormat aFormat, ErrorResult& aRv) const; + +protected: + Impl* mImpl; +}; + +} // namespace dom +} // namespace mozilla + +#endif /* mozilla_dom_ImageBitmapFormatUtils_h */ |