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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkRect.h"
void SkIRect::join(int32_t left, int32_t top, int32_t right, int32_t bottom) {
// do nothing if the params are empty
if (left >= right || top >= bottom) {
return;
}
// if we are empty, just assign
if (fLeft >= fRight || fTop >= fBottom) {
this->set(left, top, right, bottom);
} else {
if (left < fLeft) fLeft = left;
if (top < fTop) fTop = top;
if (right > fRight) fRight = right;
if (bottom > fBottom) fBottom = bottom;
}
}
void SkIRect::sort() {
if (fLeft > fRight) {
SkTSwap<int32_t>(fLeft, fRight);
}
if (fTop > fBottom) {
SkTSwap<int32_t>(fTop, fBottom);
}
}
/////////////////////////////////////////////////////////////////////////////
void SkRect::toQuad(SkPoint quad[4]) const {
SkASSERT(quad);
quad[0].set(fLeft, fTop);
quad[1].set(fRight, fTop);
quad[2].set(fRight, fBottom);
quad[3].set(fLeft, fBottom);
}
bool SkRect::setBoundsCheck(const SkPoint pts[], int count) {
SkASSERT((pts && count > 0) || count == 0);
bool isFinite = true;
if (count <= 0) {
sk_bzero(this, sizeof(SkRect));
} else {
SkScalar l, t, r, b;
l = r = pts[0].fX;
t = b = pts[0].fY;
// If all of the points are finite, accum should stay 0. If we encounter
// a NaN or infinity, then accum should become NaN.
float accum = 0;
accum *= l; accum *= t;
for (int i = 1; i < count; i++) {
SkScalar x = pts[i].fX;
SkScalar y = pts[i].fY;
accum *= x; accum *= y;
// we use if instead of if/else, so we can generate min/max
// float instructions (at least on SSE)
if (x < l) l = x;
if (x > r) r = x;
if (y < t) t = y;
if (y > b) b = y;
}
SkASSERT(!accum || !SkScalarIsFinite(accum));
if (accum) {
l = t = r = b = 0;
isFinite = false;
}
this->set(l, t, r, b);
}
return isFinite;
}
#define CHECK_INTERSECT(al, at, ar, ab, bl, bt, br, bb) \
SkScalar L = SkMaxScalar(al, bl); \
SkScalar R = SkMinScalar(ar, br); \
SkScalar T = SkMaxScalar(at, bt); \
SkScalar B = SkMinScalar(ab, bb); \
do { if (L >= R || T >= B) return false; } while (0)
bool SkRect::intersect(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) {
CHECK_INTERSECT(left, top, right, bottom, fLeft, fTop, fRight, fBottom);
this->setLTRB(L, T, R, B);
return true;
}
bool SkRect::intersect(const SkRect& r) {
return this->intersect(r.fLeft, r.fTop, r.fRight, r.fBottom);
}
bool SkRect::intersect(const SkRect& a, const SkRect& b) {
CHECK_INTERSECT(a.fLeft, a.fTop, a.fRight, a.fBottom, b.fLeft, b.fTop, b.fRight, b.fBottom);
this->setLTRB(L, T, R, B);
return true;
}
void SkRect::join(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) {
// do nothing if the params are empty
if (left >= right || top >= bottom) {
return;
}
// if we are empty, just assign
if (fLeft >= fRight || fTop >= fBottom) {
this->set(left, top, right, bottom);
} else {
fLeft = SkMinScalar(fLeft, left);
fTop = SkMinScalar(fTop, top);
fRight = SkMaxScalar(fRight, right);
fBottom = SkMaxScalar(fBottom, bottom);
}
}
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