зеркало из https://github.com/mozilla/gecko-dev.git
125 строки
4.3 KiB
C++
125 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef _MOZILLA_GFX_PATTERNHELPERS_H
|
|
#define _MOZILLA_GFX_PATTERNHELPERS_H
|
|
|
|
#include "mozilla/Alignment.h"
|
|
#include "mozilla/gfx/2D.h"
|
|
|
|
namespace mozilla {
|
|
namespace gfx {
|
|
|
|
/**
|
|
* This class is used to allow general pattern creation functions to return
|
|
* any type of pattern via an out-paramater without allocating a pattern
|
|
* instance on the free-store (an instance of this class being created on the
|
|
* stack before passing it in to the creation function). Without this class
|
|
* writing pattern creation functions would be a pain since Pattern objects are
|
|
* not reference counted, making lifetime management of instances created on
|
|
* the free-store and returned from a creation function hazardous. Besides
|
|
* that, in the case that ColorPattern's are expected to be common, it is
|
|
* particularly desirable to avoid the overhead of allocating on the
|
|
* free-store.
|
|
*/
|
|
class GeneralPattern {
|
|
public:
|
|
explicit GeneralPattern() : mPattern(nullptr) {}
|
|
|
|
GeneralPattern(const GeneralPattern &aOther) : mPattern(nullptr) {}
|
|
|
|
~GeneralPattern() {
|
|
if (mPattern) {
|
|
mPattern->~Pattern();
|
|
}
|
|
}
|
|
|
|
Pattern *Init(const Pattern &aPattern) {
|
|
MOZ_ASSERT(!mPattern);
|
|
switch (aPattern.GetType()) {
|
|
case PatternType::COLOR:
|
|
mPattern = new (mColorPattern.addr())
|
|
ColorPattern(static_cast<const ColorPattern &>(aPattern));
|
|
break;
|
|
case PatternType::LINEAR_GRADIENT:
|
|
mPattern = new (mLinearGradientPattern.addr()) LinearGradientPattern(
|
|
static_cast<const LinearGradientPattern &>(aPattern));
|
|
break;
|
|
case PatternType::RADIAL_GRADIENT:
|
|
mPattern = new (mRadialGradientPattern.addr()) RadialGradientPattern(
|
|
static_cast<const RadialGradientPattern &>(aPattern));
|
|
break;
|
|
case PatternType::SURFACE:
|
|
mPattern = new (mSurfacePattern.addr())
|
|
SurfacePattern(static_cast<const SurfacePattern &>(aPattern));
|
|
break;
|
|
default:
|
|
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unknown pattern type");
|
|
}
|
|
return mPattern;
|
|
}
|
|
|
|
ColorPattern *InitColorPattern(const Color &aColor) {
|
|
MOZ_ASSERT(!mPattern);
|
|
mPattern = new (mColorPattern.addr()) ColorPattern(aColor);
|
|
return mColorPattern.addr();
|
|
}
|
|
|
|
LinearGradientPattern *InitLinearGradientPattern(
|
|
const Point &aBegin, const Point &aEnd, GradientStops *aStops,
|
|
const Matrix &aMatrix = Matrix()) {
|
|
MOZ_ASSERT(!mPattern);
|
|
mPattern = new (mLinearGradientPattern.addr())
|
|
LinearGradientPattern(aBegin, aEnd, aStops, aMatrix);
|
|
return mLinearGradientPattern.addr();
|
|
}
|
|
|
|
RadialGradientPattern *InitRadialGradientPattern(
|
|
const Point &aCenter1, const Point &aCenter2, Float aRadius1,
|
|
Float aRadius2, GradientStops *aStops, const Matrix &aMatrix = Matrix()) {
|
|
MOZ_ASSERT(!mPattern);
|
|
mPattern = new (mRadialGradientPattern.addr()) RadialGradientPattern(
|
|
aCenter1, aCenter2, aRadius1, aRadius2, aStops, aMatrix);
|
|
return mRadialGradientPattern.addr();
|
|
}
|
|
|
|
SurfacePattern *InitSurfacePattern(
|
|
SourceSurface *aSourceSurface, ExtendMode aExtendMode,
|
|
const Matrix &aMatrix = Matrix(),
|
|
SamplingFilter aSamplingFilter = SamplingFilter::GOOD,
|
|
const IntRect &aSamplingRect = IntRect()) {
|
|
MOZ_ASSERT(!mPattern);
|
|
mPattern = new (mSurfacePattern.addr()) SurfacePattern(
|
|
aSourceSurface, aExtendMode, aMatrix, aSamplingFilter, aSamplingRect);
|
|
return mSurfacePattern.addr();
|
|
}
|
|
|
|
Pattern *GetPattern() { return mPattern; }
|
|
|
|
const Pattern *GetPattern() const { return mPattern; }
|
|
|
|
operator Pattern &() {
|
|
if (!mPattern) {
|
|
MOZ_CRASH("GFX: GeneralPattern not initialized");
|
|
}
|
|
return *mPattern;
|
|
}
|
|
|
|
private:
|
|
union {
|
|
AlignedStorage2<ColorPattern> mColorPattern;
|
|
AlignedStorage2<LinearGradientPattern> mLinearGradientPattern;
|
|
AlignedStorage2<RadialGradientPattern> mRadialGradientPattern;
|
|
AlignedStorage2<SurfacePattern> mSurfacePattern;
|
|
};
|
|
Pattern *mPattern;
|
|
};
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|
|
|
|
#endif // _MOZILLA_GFX_PATTERNHELPERS_H
|