| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef NinePieceImageGrid_h |
| #define NinePieceImageGrid_h |
| |
| #include "core/CoreExport.h" |
| #include "platform/geometry/FloatRect.h" |
| #include "platform/geometry/FloatSize.h" |
| #include "platform/geometry/IntRect.h" |
| #include "platform/geometry/IntSize.h" |
| #include "platform/graphics/Image.h" |
| #include "platform/heap/Heap.h" |
| |
| namespace blink { |
| |
| class IntRectOutsets; |
| class NinePieceImage; |
| |
| enum NinePiece { |
| MinPiece = 0, |
| TopLeftPiece = MinPiece, |
| BottomLeftPiece, |
| LeftPiece, |
| TopRightPiece, |
| BottomRightPiece, |
| RightPiece, |
| TopPiece, |
| BottomPiece, |
| MiddlePiece, |
| MaxPiece |
| }; |
| |
| inline NinePiece& operator++(NinePiece& piece) { |
| piece = static_cast<NinePiece>(static_cast<int>(piece) + 1); |
| return piece; |
| } |
| |
| // The NinePieceImageGrid class is responsible for computing drawing information |
| // for the nine piece image. |
| // |
| // http://dev.w3.org/csswg/css-backgrounds-3/#border-image-process |
| // |
| // Given an image, a set of slices and a border area: |
| // |
| // | | |
| // +---+---------+---+ +------------------+ |
| // | 1 | 7 | 4 | | border | |
| // --+---+---------+---+--- | +------------+ | |
| // | | | | | | | | |
| // | 3 | 9 | 6 | | | css | | |
| // | | image | | | | box | | |
| // | | | | | | | | |
| // --+---+---------+---+--- | | | | |
| // | 2 | 8 | 5 | | +------------+ | |
| // +---+---------+---+ | | |
| // | | +------------------+ |
| // |
| // it generates drawing information for the nine border pieces. |
| class CORE_EXPORT NinePieceImageGrid { |
| STACK_ALLOCATED(); |
| |
| public: |
| NinePieceImageGrid(const NinePieceImage&, |
| IntSize imageSize, |
| IntRect borderImageArea, |
| const IntRectOutsets& borderWidths); |
| |
| struct CORE_EXPORT NinePieceDrawInfo { |
| STACK_ALLOCATED(); |
| bool isDrawable; |
| bool isCornerPiece; |
| FloatRect destination; |
| FloatRect source; |
| |
| // tileScale and tileRule are only useful for non-corners, i.e. edge and |
| // center pieces. |
| FloatSize tileScale; |
| struct { |
| Image::TileRule horizontal; |
| Image::TileRule vertical; |
| } tileRule; |
| }; |
| NinePieceDrawInfo getNinePieceDrawInfo(NinePiece, float) const; |
| |
| struct Edge { |
| DISALLOW_NEW(); |
| bool isDrawable() const { return slice > 0 && width > 0; } |
| float scale() const { return isDrawable() ? (float)width / slice : 1; } |
| int slice; |
| int width; |
| }; |
| |
| private: |
| void setDrawInfoCorner(NinePieceDrawInfo&, NinePiece) const; |
| void setDrawInfoEdge(NinePieceDrawInfo&, NinePiece) const; |
| void setDrawInfoMiddle(NinePieceDrawInfo&) const; |
| |
| IntRect m_borderImageArea; |
| IntSize m_imageSize; |
| Image::TileRule m_horizontalTileRule; |
| Image::TileRule m_verticalTileRule; |
| bool m_fill; |
| |
| Edge m_top; |
| Edge m_right; |
| Edge m_bottom; |
| Edge m_left; |
| }; |
| |
| } // namespace blink |
| |
| #endif // NinePieceImageGrid_h |