| /* |
| * Copyright (C) 2021 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include "DisplayList.h" |
| |
| namespace WebCore { |
| namespace DisplayList { |
| |
| class DisplayList::Iterator { |
| public: |
| enum class ImmediatelyMoveToEnd { No, Yes }; |
| Iterator(const DisplayList& displayList, ImmediatelyMoveToEnd immediatelyMoveToEnd = ImmediatelyMoveToEnd::No) |
| : m_displayList(displayList) |
| { |
| if (immediatelyMoveToEnd == ImmediatelyMoveToEnd::Yes) |
| moveToEnd(); |
| else { |
| moveCursorToStartOfCurrentBuffer(); |
| updateCurrentItem(); |
| } |
| } |
| |
| ~Iterator() |
| { |
| clearCurrentItem(); |
| } |
| |
| bool operator==(const Iterator& other) const { return &m_displayList == &other.m_displayList && m_cursor == other.m_cursor; } |
| bool operator!=(const Iterator& other) const { return !(*this == other); } |
| void operator++() { advance(); } |
| |
| struct Value { |
| ItemHandle item; |
| std::optional<FloatRect> extent; |
| size_t itemSizeInBuffer { 0 }; |
| }; |
| |
| std::optional<Value> operator*() const |
| { |
| if (!m_isValid) |
| return std::nullopt; |
| return {{ |
| ItemHandle { m_currentBufferForItem }, |
| m_currentExtent, |
| m_currentItemSizeInBuffer, |
| }}; |
| } |
| |
| private: |
| static constexpr size_t sizeOfFixedBufferForCurrentItem = 256; |
| |
| WEBCORE_EXPORT void moveCursorToStartOfCurrentBuffer(); |
| WEBCORE_EXPORT void moveToEnd(); |
| WEBCORE_EXPORT void clearCurrentItem(); |
| WEBCORE_EXPORT void updateCurrentItem(); |
| WEBCORE_EXPORT void advance(); |
| |
| enum class ExtentUpdateResult : bool { Failure, Success }; |
| ExtentUpdateResult updateCurrentDrawingItemExtent(ItemType); |
| |
| bool atEnd() const; |
| |
| ItemBuffer* itemBuffer() const { return m_displayList.itemBufferIfExists(); } |
| |
| const DisplayList& m_displayList; |
| uint8_t* m_cursor { nullptr }; |
| size_t m_readOnlyBufferIndex { 0 }; |
| size_t m_drawingItemIndex { 0 }; |
| uint8_t* m_currentEndOfBuffer { nullptr }; |
| |
| uint8_t m_fixedBufferForCurrentItem[sizeOfFixedBufferForCurrentItem] { 0 }; |
| uint8_t* m_currentBufferForItem { nullptr }; |
| std::optional<FloatRect> m_currentExtent; |
| size_t m_currentItemSizeInBuffer { 0 }; |
| bool m_isValid { true }; |
| }; |
| |
| } |
| } |