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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrClip_DEFINED
#define GrClip_DEFINED
#include "SkRect.h"
#include "SkRRect.h"
class GrAppliedClip;
class GrContext;
class GrDrawContext;
/**
* GrClip is an abstract base class for applying a clip. It constructs a clip mask if necessary, and
* fills out a GrAppliedClip instructing the caller on how to set up the draw state.
*/
class GrClip {
public:
virtual bool quickContains(const SkRect&) const = 0;
virtual bool quickContains(const SkRRect& rrect) const {
return this->quickContains(rrect.getBounds());
}
virtual void getConservativeBounds(int width, int height, SkIRect* devResult,
bool* isIntersectionOfRects = nullptr) const = 0;
virtual bool apply(GrContext*, GrDrawContext*, bool useHWAA, bool hasUserStencilSettings,
GrAppliedClip* out) const = 0;
virtual ~GrClip() {}
/**
* This is the maximum distance that a draw may extend beyond a clip's boundary and still count
* count as "on the other side". We leave some slack because floating point rounding error is
* likely to blame. The rationale for 1e-3 is that in the coverage case (and barring unexpected
* rounding), as long as coverage stays within 0.5 * 1/256 of its intended value it shouldn't
* have any effect on the final pixel values.
*/
constexpr static SkScalar kBoundsTolerance = 1e-3f;
/**
* Returns true if the given query bounds count as entirely inside the clip.
*
* @param innerClipBounds device-space rect contained by the clip (SkRect or SkIRect).
* @param queryBounds device-space bounds of the query region.
*/
template<typename TRect> constexpr static bool IsInsideClip(const TRect& innerClipBounds,
const SkRect& queryBounds) {
return innerClipBounds.fRight - innerClipBounds.fLeft > kBoundsTolerance &&
innerClipBounds.fBottom - innerClipBounds.fTop > kBoundsTolerance &&
innerClipBounds.fLeft < queryBounds.fLeft + kBoundsTolerance &&
innerClipBounds.fTop < queryBounds.fTop + kBoundsTolerance &&
innerClipBounds.fRight > queryBounds.fRight - kBoundsTolerance &&
innerClipBounds.fBottom > queryBounds.fBottom - kBoundsTolerance;
}
/**
* Returns true if the given query bounds count as entirely outside the clip.
*
* @param outerClipBounds device-space rect that contains the clip (SkRect or SkIRect).
* @param queryBounds device-space bounds of the query region.
*/
template<typename TRect> constexpr static bool IsOutsideClip(const TRect& outerClipBounds,
const SkRect& queryBounds) {
return outerClipBounds.fRight - outerClipBounds.fLeft <= kBoundsTolerance ||
outerClipBounds.fBottom - outerClipBounds.fTop <= kBoundsTolerance ||
outerClipBounds.fLeft >= queryBounds.fRight - kBoundsTolerance ||
outerClipBounds.fTop >= queryBounds.fBottom - kBoundsTolerance ||
outerClipBounds.fRight <= queryBounds.fLeft + kBoundsTolerance ||
outerClipBounds.fBottom <= queryBounds.fTop + kBoundsTolerance;
}
/**
* Returns the minimal integer rect that counts as containing a given set of bounds.
*/
static SkIRect GetPixelIBounds(const SkRect& bounds) {
return SkIRect::MakeLTRB(SkScalarFloorToInt(bounds.fLeft + kBoundsTolerance),
SkScalarFloorToInt(bounds.fTop + kBoundsTolerance),
SkScalarCeilToInt(bounds.fRight - kBoundsTolerance),
SkScalarCeilToInt(bounds.fBottom - kBoundsTolerance));
}
/**
* Returns the minimal pixel-aligned rect that counts as containing a given set of bounds.
*/
static SkRect GetPixelBounds(const SkRect& bounds) {
return SkRect::MakeLTRB(SkScalarFloorToScalar(bounds.fLeft + kBoundsTolerance),
SkScalarFloorToScalar(bounds.fTop + kBoundsTolerance),
SkScalarCeilToScalar(bounds.fRight - kBoundsTolerance),
SkScalarCeilToScalar(bounds.fBottom - kBoundsTolerance));
}
/**
* Returns true if the given rect counts as aligned with pixel boundaries.
*/
static bool IsPixelAligned(const SkRect& rect) {
return SkScalarAbs(SkScalarRoundToScalar(rect.fLeft) - rect.fLeft) <= kBoundsTolerance &&
SkScalarAbs(SkScalarRoundToScalar(rect.fTop) - rect.fTop) <= kBoundsTolerance &&
SkScalarAbs(SkScalarRoundToScalar(rect.fRight) - rect.fRight) <= kBoundsTolerance &&
SkScalarAbs(SkScalarRoundToScalar(rect.fBottom) - rect.fBottom) <= kBoundsTolerance;
}
};
/**
* Specialized implementation for no clip.
*/
class GrNoClip final : public GrClip {
private:
bool quickContains(const SkRect&) const final {
return true;
}
void getConservativeBounds(int width, int height, SkIRect* devResult,
bool* isIntersectionOfRects) const final {
devResult->setXYWH(0, 0, width, height);
if (isIntersectionOfRects) {
*isIntersectionOfRects = true;
}
}
bool apply(GrContext*, GrDrawContext*, bool, bool, GrAppliedClip*) const final {
return true;
}
};
#endif
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