138 lines
4.7 KiB
C++
138 lines
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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_GFX_PATTERNHELPERS_H
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#define _MOZILLA_GFX_PATTERNHELPERS_H
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#include "mozilla/Alignment.h"
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#include "mozilla/gfx/2D.h"
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namespace mozilla {
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namespace gfx {
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/**
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* This class is used to allow general pattern creation functions to return
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* any type of pattern via an out-paramater without allocating a pattern
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* instance on the free-store (an instance of this class being created on the
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* stack before passing it in to the creation function). Without this class
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* writing pattern creation functions would be a pain since Pattern objects are
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* not reference counted, making lifetime management of instances created on
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* the free-store and returned from a creation function hazardous. Besides
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* that, in the case that ColorPattern's are expected to be common, it is
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* particularly desirable to avoid the overhead of allocating on the
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* free-store.
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*/
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class GeneralPattern
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{
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public:
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explicit GeneralPattern()
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: mPattern(nullptr)
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{}
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GeneralPattern(const GeneralPattern& aOther)
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: mPattern(nullptr)
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{}
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~GeneralPattern() {
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if (mPattern) {
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mPattern->~Pattern();
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}
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}
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Pattern* Init(const Pattern& aPattern) {
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MOZ_ASSERT(!mPattern);
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switch (aPattern.GetType()) {
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case PatternType::COLOR:
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mPattern = new (mColorPattern.addr())
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ColorPattern(static_cast<const ColorPattern&>(aPattern));
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break;
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case PatternType::LINEAR_GRADIENT:
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mPattern = new (mLinearGradientPattern.addr())
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LinearGradientPattern(static_cast<const LinearGradientPattern&>(aPattern));
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break;
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case PatternType::RADIAL_GRADIENT:
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mPattern = new (mRadialGradientPattern.addr())
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RadialGradientPattern(static_cast<const RadialGradientPattern&>(aPattern));
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break;
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case PatternType::SURFACE:
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mPattern = new (mSurfacePattern.addr())
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SurfacePattern(static_cast<const SurfacePattern&>(aPattern));
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break;
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default:
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MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unknown pattern type");
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}
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return mPattern;
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}
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ColorPattern* InitColorPattern(const Color &aColor) {
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MOZ_ASSERT(!mPattern);
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mPattern = new (mColorPattern.addr()) ColorPattern(aColor);
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return mColorPattern.addr();
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}
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LinearGradientPattern* InitLinearGradientPattern(const Point &aBegin,
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const Point &aEnd,
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GradientStops *aStops,
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const Matrix &aMatrix = Matrix()) {
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MOZ_ASSERT(!mPattern);
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mPattern = new (mLinearGradientPattern.addr())
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LinearGradientPattern(aBegin, aEnd, aStops, aMatrix);
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return mLinearGradientPattern.addr();
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}
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RadialGradientPattern* InitRadialGradientPattern(const Point &aCenter1,
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const Point &aCenter2,
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Float aRadius1,
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Float aRadius2,
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GradientStops *aStops,
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const Matrix &aMatrix = Matrix()) {
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MOZ_ASSERT(!mPattern);
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mPattern = new (mRadialGradientPattern.addr())
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RadialGradientPattern(aCenter1, aCenter2, aRadius1, aRadius2, aStops, aMatrix);
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return mRadialGradientPattern.addr();
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}
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SurfacePattern* InitSurfacePattern(SourceSurface *aSourceSurface,
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ExtendMode aExtendMode,
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const Matrix &aMatrix = Matrix(),
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SamplingFilter aSamplingFilter = SamplingFilter::GOOD,
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const IntRect &aSamplingRect = IntRect()) {
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MOZ_ASSERT(!mPattern);
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mPattern = new (mSurfacePattern.addr())
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SurfacePattern(aSourceSurface, aExtendMode, aMatrix, aSamplingFilter, aSamplingRect);
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return mSurfacePattern.addr();
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}
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Pattern* GetPattern() {
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return mPattern;
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}
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const Pattern* GetPattern() const {
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return mPattern;
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}
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operator Pattern&() {
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if (!mPattern) {
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MOZ_CRASH("GFX: GeneralPattern not initialized");
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}
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return *mPattern;
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}
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private:
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union {
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AlignedStorage2<ColorPattern> mColorPattern;
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AlignedStorage2<LinearGradientPattern> mLinearGradientPattern;
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AlignedStorage2<RadialGradientPattern> mRadialGradientPattern;
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AlignedStorage2<SurfacePattern> mSurfacePattern;
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};
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Pattern *mPattern;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // _MOZILLA_GFX_PATTERNHELPERS_H
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