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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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_PAINTING_MATRIXSTACK_H
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#define MOZILLA_PAINTING_MATRIXSTACK_H
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#include "nsTArray.h"
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#include "mozilla/gfx/MatrixFwd.h"
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namespace mozilla {
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/**
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* MatrixStack stores a stack of matrices and keeps track of the accumulated
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* transform matrix.
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*/
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template <typename T>
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class MatrixStack {
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public:
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MatrixStack() = default;
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~MatrixStack() { MOZ_ASSERT(mMatrices.IsEmpty()); }
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/**
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* Returns the current accumulated transform matrix.
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*/
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const T& CurrentMatrix() const { return mCurrentMatrix; }
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/**
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* Returns true if any matrices are currently pushed to the stack.
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*/
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bool HasTransform() const { return mMatrices.Length() > 0; }
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/**
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* Pushes the given |aMatrix| to the stack.
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*/
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void Push(const T& aMatrix) {
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mMatrices.AppendElement(mCurrentMatrix);
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mCurrentMatrix = aMatrix * mCurrentMatrix;
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}
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/**
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* Pops the most recently added matrix from the stack.
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*/
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void Pop() {
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MOZ_ASSERT(mMatrices.Length() > 0);
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mCurrentMatrix = mMatrices.PopLastElement();
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}
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private:
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T mCurrentMatrix;
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AutoTArray<T, 2> mMatrices;
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};
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typedef MatrixStack<gfx::Matrix4x4Flagged> MatrixStack4x4;
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} // namespace mozilla
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#endif /* MOZILLA_PAINTING_MATRIXSTACK_H */
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