74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_ImageBitmapFormatUtils_h
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#define mozilla_dom_ImageBitmapFormatUtils_h
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#include "mozilla/UniquePtr.h"
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#include "nsTArrayForwardDeclare.h"
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namespace mozilla {
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namespace layers {
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class Image;
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}
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class ErrorResult;
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namespace dom {
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struct ChannelPixelLayout;
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enum class ImageBitmapFormat : uint32_t;
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typedef nsTArray<ChannelPixelLayout> ImagePixelLayout;
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/*
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* ImageUtils is a wrapper around layers::Image. It provides three unified
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* methods to all sub-classes of layers::Image, which are:
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*
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* (1) GetFormat() converts the image's format into ImageBitmapFormat enum.
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* (2) GetBufferLength() returns the number of bytes that are used to store
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* the image's underlying raw data.
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* (3) MapDataInto() writes the image's underlying raw data into a given
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* ArrayBuffer in the given format. (If the given format is different from
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* the existing format, the ImageUtils uses the ImageBitmapFormatUtils to
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* performa color conversion.)
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*
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* In theory, the functionalities of this class could be merged into the
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* interface of layers::Image. However, this is designed as a isolated wrapper
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* because we don't want to pollute the layers::Image's interface with methods
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* that are only meaningful to the ImageBitmap.
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*/
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class ImageUtils
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{
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public:
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class Impl;
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ImageUtils() = delete;
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ImageUtils(const ImageUtils&) = delete;
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ImageUtils(ImageUtils&&) = delete;
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ImageUtils& operator=(const ImageUtils&) = delete;
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ImageUtils& operator=(ImageUtils&&) = delete;
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explicit ImageUtils(layers::Image* aImage);
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~ImageUtils();
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ImageBitmapFormat GetFormat() const;
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uint32_t GetBufferLength() const;
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UniquePtr<ImagePixelLayout>
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MapDataInto(uint8_t* aBuffer, uint32_t aOffset, uint32_t aBufferLength,
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ImageBitmapFormat aFormat, ErrorResult& aRv) const;
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protected:
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Impl* mImpl;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_ImageBitmapFormatUtils_h */
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