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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrQuad.h"
#include "GrTypesPriv.h"
///////////////////////////////////////////////////////////////////////////////////////////////////
// Functions for identifying the quad type from its coordinates, which are kept debug-only since
// production code should rely on the matrix to derive the quad type more efficiently. These are
// useful in asserts that the quad type is as expected.
///////////////////////////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEBUG
// Allow some tolerance from floating point matrix transformations, but SkScalarNearlyEqual doesn't
// support comparing infinity, and coords_form_rect should return true for infinite edges
#define NEARLY_EQUAL(f1, f2) (f1 == f2 || SkScalarNearlyEqual(f1, f2, 1e-5f))
// Similarly, support infinite rectangles by looking at the sign of infinities
static bool dot_nearly_zero(const SkVector& e1, const SkVector& e2) {
static constexpr auto dot = SkPoint::DotProduct;
static constexpr auto sign = SkScalarSignAsScalar;
SkScalar dotValue = dot(e1, e2);
if (SkScalarIsNaN(dotValue)) {
// Form vectors from the signs of infinities, and check their dot product
dotValue = dot({sign(e1.fX), sign(e1.fY)}, {sign(e2.fX), sign(e2.fY)});
}
// Unfortunately must have a pretty healthy tolerance here or transformed rects that are
// effectively rectilinear will have edge dot products of around .005
return SkScalarNearlyZero(dotValue, 1e-2f);
}
// This is not the most performance critical function; code using GrQuad should rely on the faster
// quad type from matrix path, so this will only be called as part of SkASSERT.
static bool coords_form_rect(const float xs[4], const float ys[4]) {
return (NEARLY_EQUAL(xs[0], xs[1]) && NEARLY_EQUAL(xs[2], xs[3]) &&
NEARLY_EQUAL(ys[0], ys[2]) && NEARLY_EQUAL(ys[1], ys[3])) ||
(NEARLY_EQUAL(xs[0], xs[2]) && NEARLY_EQUAL(xs[1], xs[3]) &&
NEARLY_EQUAL(ys[0], ys[1]) && NEARLY_EQUAL(ys[2], ys[3]));
}
static bool coords_rectilinear(const float xs[4], const float ys[4]) {
SkVector e0{xs[1] - xs[0], ys[1] - ys[0]}; // Connects to e1 and e2(repeat)
SkVector e1{xs[3] - xs[1], ys[3] - ys[1]}; // connects to e0(repeat) and e3
SkVector e2{xs[0] - xs[2], ys[0] - ys[2]}; // connects to e0 and e3(repeat)
SkVector e3{xs[2] - xs[3], ys[2] - ys[3]}; // connects to e1(repeat) and e2
return dot_nearly_zero(e0, e1) && dot_nearly_zero(e1, e3) &&
dot_nearly_zero(e2, e0) && dot_nearly_zero(e3, e2);
}
GrQuadType GrQuad::quadType() const {
// Since GrQuad applies any perspective information at construction time, there's only two
// types to choose from.
if (coords_form_rect(fX, fY)) {
return GrQuadType::kRect;
} else if (coords_rectilinear(fX, fY)) {
return GrQuadType::kRectilinear;
} else {
return GrQuadType::kStandard;
}
}
GrQuadType GrPerspQuad::quadType() const {
if (this->hasPerspective()) {
return GrQuadType::kPerspective;
} else {
// Rect or standard quad, can ignore w since they are all ones
if (coords_form_rect(fX, fY)) {
return GrQuadType::kRect;
} else if (coords_rectilinear(fX, fY)) {
return GrQuadType::kRectilinear;
} else {
return GrQuadType::kStandard;
}
}
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
static bool aa_affects_rect(float ql, float qt, float qr, float qb) {
return !SkScalarIsInt(ql) || !SkScalarIsInt(qr) || !SkScalarIsInt(qt) || !SkScalarIsInt(qb);
}
template <typename Q>
void GrResolveAATypeForQuad(GrAAType requestedAAType, GrQuadAAFlags requestedEdgeFlags,
const Q& quad, GrQuadType knownType,
GrAAType* outAAType, GrQuadAAFlags* outEdgeFlags) {
// Most cases will keep the requested types unchanged
*outAAType = requestedAAType;
*outEdgeFlags = requestedEdgeFlags;
switch (requestedAAType) {
// When aa type is coverage, disable AA if the edge configuration doesn't actually need it
case GrAAType::kCoverage:
if (requestedEdgeFlags == GrQuadAAFlags::kNone) {
// Turn off anti-aliasing
*outAAType = GrAAType::kNone;
} else {
// For coverage AA, if the quad is a rect and it lines up with pixel boundaries
// then overall aa and per-edge aa can be completely disabled
if (knownType == GrQuadType::kRect && !quad.aaHasEffectOnRect()) {
*outAAType = GrAAType::kNone;
*outEdgeFlags = GrQuadAAFlags::kNone;
}
}
break;
// For no or msaa anti aliasing, override the edge flags since edge flags only make sense
// when coverage aa is being used.
case GrAAType::kNone:
*outEdgeFlags = GrQuadAAFlags::kNone;
break;
case GrAAType::kMSAA:
*outEdgeFlags = GrQuadAAFlags::kAll;
break;
case GrAAType::kMixedSamples:
SK_ABORT("Should not use mixed sample AA with edge AA flags");
break;
}
};
// Instantiate GrResolve... for GrQuad and GrPerspQuad
template void GrResolveAATypeForQuad(GrAAType, GrQuadAAFlags, const GrQuad&, GrQuadType,
GrAAType*, GrQuadAAFlags*);
template void GrResolveAATypeForQuad(GrAAType, GrQuadAAFlags, const GrPerspQuad&, GrQuadType,
GrAAType*, GrQuadAAFlags*);
GrQuadType GrQuadTypeForTransformedRect(const SkMatrix& matrix) {
if (matrix.rectStaysRect()) {
return GrQuadType::kRect;
} else if (matrix.preservesRightAngles()) {
return GrQuadType::kRectilinear;
} else if (matrix.hasPerspective()) {
return GrQuadType::kPerspective;
} else {
return GrQuadType::kStandard;
}
}
GrQuad::GrQuad(const SkRect& rect, const SkMatrix& m) {
SkMatrix::TypeMask tm = m.getType();
if (tm <= (SkMatrix::kScale_Mask | SkMatrix::kTranslate_Mask)) {
auto r = Sk4f::Load(&rect);
const Sk4f t(m.getTranslateX(), m.getTranslateY(), m.getTranslateX(), m.getTranslateY());
if (tm <= SkMatrix::kTranslate_Mask) {
r += t;
} else {
const Sk4f s(m.getScaleX(), m.getScaleY(), m.getScaleX(), m.getScaleY());
r = r * s + t;
}
SkNx_shuffle<0, 0, 2, 2>(r).store(fX);
SkNx_shuffle<1, 3, 1, 3>(r).store(fY);
} else {
Sk4f rx(rect.fLeft, rect.fLeft, rect.fRight, rect.fRight);
Sk4f ry(rect.fTop, rect.fBottom, rect.fTop, rect.fBottom);
Sk4f sx(m.getScaleX());
Sk4f kx(m.getSkewX());
Sk4f tx(m.getTranslateX());
Sk4f ky(m.getSkewY());
Sk4f sy(m.getScaleY());
Sk4f ty(m.getTranslateY());
auto x = SkNx_fma(sx, rx, SkNx_fma(kx, ry, tx));
auto y = SkNx_fma(ky, rx, SkNx_fma(sy, ry, ty));
if (m.hasPerspective()) {
Sk4f w0(m.getPerspX());
Sk4f w1(m.getPerspY());
Sk4f w2(m.get(SkMatrix::kMPersp2));
auto iw = SkNx_fma(w0, rx, SkNx_fma(w1, ry, w2)).invert();
x *= iw;
y *= iw;
}
x.store(fX);
y.store(fY);
}
}
bool GrQuad::aaHasEffectOnRect() const {
SkASSERT(this->quadType() == GrQuadType::kRect);
return aa_affects_rect(fX[0], fY[0], fX[3], fY[3]);
}
GrPerspQuad::GrPerspQuad(const SkRect& rect, const SkMatrix& m) {
SkMatrix::TypeMask tm = m.getType();
if (tm <= (SkMatrix::kScale_Mask | SkMatrix::kTranslate_Mask)) {
auto r = Sk4f::Load(&rect);
const Sk4f t(m.getTranslateX(), m.getTranslateY(), m.getTranslateX(), m.getTranslateY());
if (tm <= SkMatrix::kTranslate_Mask) {
r += t;
} else {
const Sk4f s(m.getScaleX(), m.getScaleY(), m.getScaleX(), m.getScaleY());
r = r * s + t;
}
SkNx_shuffle<0, 0, 2, 2>(r).store(fX);
SkNx_shuffle<1, 3, 1, 3>(r).store(fY);
fW[0] = fW[1] = fW[2] = fW[3] = 1.f;
fIW[0] = fIW[1] = fIW[2] = fIW[3] = 1.f;
} else {
Sk4f rx(rect.fLeft, rect.fLeft, rect.fRight, rect.fRight);
Sk4f ry(rect.fTop, rect.fBottom, rect.fTop, rect.fBottom);
Sk4f sx(m.getScaleX());
Sk4f kx(m.getSkewX());
Sk4f tx(m.getTranslateX());
Sk4f ky(m.getSkewY());
Sk4f sy(m.getScaleY());
Sk4f ty(m.getTranslateY());
SkNx_fma(sx, rx, SkNx_fma(kx, ry, tx)).store(fX);
SkNx_fma(ky, rx, SkNx_fma(sy, ry, ty)).store(fY);
if (m.hasPerspective()) {
Sk4f w0(m.getPerspX());
Sk4f w1(m.getPerspY());
Sk4f w2(m.get(SkMatrix::kMPersp2));
auto w = SkNx_fma(w0, rx, SkNx_fma(w1, ry, w2));
w.store(fW);
w.invert().store(fIW);
} else {
fW[0] = fW[1] = fW[2] = fW[3] = 1.f;
fIW[0] = fIW[1] = fIW[2] = fIW[3] = 1.f;
}
}
}
bool GrPerspQuad::aaHasEffectOnRect() const {
SkASSERT(this->quadType() == GrQuadType::kRect);
// If rect, ws must all be 1s so no need to divide
return aa_affects_rect(fX[0], fY[0], fX[3], fY[3]);
}
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