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c83da98d50
skia2/include/core/SkRect.h
Mike Reed 148b7fd3ad add saveBehind to canvas 
Bug: skia:
Change-Id: I62e48b116b2d7efef585d4f465441f24ae4d2b29
Reviewed-on: https://skia-review.googlesource.com/c/177892
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2018-12-19 14:44:09 +00:00

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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.
*/
/* Generated by tools/bookmaker from include/core/SkRect.h and docs/SkRect_Reference.bmh
on 2018-09-13 13:59:55. Additional documentation and examples can be found at:
https://skia.org/user/api/SkRect_Reference
You may edit either file directly. Structural changes to public interfaces require
editing both files. After editing docs/SkRect_Reference.bmh, run:
bookmaker -b docs -i include/core/SkRect.h -p
to create an updated version of this file.
*/
#ifndef SkRect_DEFINED
#define SkRect_DEFINED
#include "SkPoint.h"
#include "SkSize.h"
#include "../private/SkSafe32.h"
#include "../private/SkTFitsIn.h"
#include <utility>
struct SkRect;
/** \struct SkIRect
SkIRect holds four 32-bit integer coordinates describing the upper and
lower bounds of a rectangle. SkIRect may be created from outer bounds or
from position, width, and height. SkIRect describes an area; if its right
is less than or equal to its left, or if its bottom is less than or equal to
its top, it is considered empty.
*/
struct SK_API SkIRect {
int32_t fLeft; //!< smaller x-axis bounds
int32_t fTop; //!< smaller y-axis bounds
int32_t fRight; //!< larger x-axis bounds
int32_t fBottom; //!< larger y-axis bounds
/** Returns constructed SkIRect set to (0, 0, 0, 0).
Many other rectangles are empty; if left is equal to or greater than right,
or if top is equal to or greater than bottom. Setting all members to zero
is a convenience, but does not designate a special empty rectangle.
@return bounds (0, 0, 0, 0)
*/
static constexpr SkIRect SK_WARN_UNUSED_RESULT MakeEmpty() {
return SkIRect{0, 0, 0, 0};
}
/** Returns constructed SkIRect set to (0, 0, w, h). Does not validate input; w or h
may be negative.
@param w width of constructed SkIRect
@param h height of constructed SkIRect
@return bounds (0, 0, w, h)
*/
static constexpr SkIRect SK_WARN_UNUSED_RESULT MakeWH(int32_t w, int32_t h) {
return SkIRect{0, 0, w, h};
}
/** Returns constructed SkIRect set to (0, 0, size.width(), size.height()).
Does not validate input; size.width() or size.height() may be negative.
@param size values for SkIRect width and height
@return bounds (0, 0, size.width(), size.height())
*/
static constexpr SkIRect SK_WARN_UNUSED_RESULT MakeSize(const SkISize& size) {
return SkIRect{0, 0, size.fWidth, size.fHeight};
}
/** Returns constructed SkIRect set to (l, t, r, b). Does not sort input; SkIRect may
result in fLeft greater than fRight, or fTop greater than fBottom.
@param l integer stored in fLeft
@param t integer stored in fTop
@param r integer stored in fRight
@param b integer stored in fBottom
@return bounds (l, t, r, b)
*/
static constexpr SkIRect SK_WARN_UNUSED_RESULT MakeLTRB(int32_t l, int32_t t,
int32_t r, int32_t b) {
return SkIRect{l, t, r, b};
}
/** Returns constructed SkIRect set to: (x, y, x + w, y + h).
Does not validate input; w or h may be negative.
@param x stored in fLeft
@param y stored in fTop
@param w added to x and stored in fRight
@param h added to y and stored in fBottom
@return bounds at (x, y) with width w and height h
*/
static constexpr SkIRect SK_WARN_UNUSED_RESULT MakeXYWH(int32_t x, int32_t y,
int32_t w, int32_t h) {
return { x, y, Sk32_sat_add(x, w), Sk32_sat_add(y, h) };
}
/** Returns left edge of SkIRect, if sorted.
Call sort() to reverse fLeft and fRight if needed.
@return fLeft
*/
int32_t left() const { return fLeft; }
/** Returns top edge of SkIRect, if sorted. Call isEmpty() to see if SkIRect may be invalid,
and sort() to reverse fTop and fBottom if needed.
@return fTop
*/
int32_t top() const { return fTop; }
/** Returns right edge of SkIRect, if sorted.
Call sort() to reverse fLeft and fRight if needed.
@return fRight
*/
int32_t right() const { return fRight; }
/** Returns bottom edge of SkIRect, if sorted. Call isEmpty() to see if SkIRect may be invalid,
and sort() to reverse fTop and fBottom if needed.
@return fBottom
*/
int32_t bottom() const { return fBottom; }
/** Returns left edge of SkIRect, if sorted. Call isEmpty() to see if SkIRect may be invalid,
and sort() to reverse fLeft and fRight if needed.
@return fLeft
*/
int32_t x() const { return fLeft; }
/** Returns top edge of SkIRect, if sorted. Call isEmpty() to see if SkIRect may be invalid,
and sort() to reverse fTop and fBottom if needed.
@return fTop
*/
int32_t y() const { return fTop; }
// Experimental
SkIPoint topLeft() const { return {fLeft, fTop}; }
/** Returns span on the x-axis. This does not check if SkIRect is sorted, or if
result fits in 32-bit signed integer; result may be negative.
@return fRight minus fLeft
*/
int32_t width() const { return Sk32_can_overflow_sub(fRight, fLeft); }
/** Returns span on the y-axis. This does not check if SkIRect is sorted, or if
result fits in 32-bit signed integer; result may be negative.
@return fBottom minus fTop
*/
int32_t height() const { return Sk32_can_overflow_sub(fBottom, fTop); }
/** Returns spans on the x-axis and y-axis. This does not check if SkIRect is sorted,
or if result fits in 32-bit signed integer; result may be negative.
@return SkISize (width, height)
*/
SkISize size() const { return SkISize::Make(this->width(), this->height()); }
/** Returns span on the x-axis. This does not check if SkIRect is sorted, so the
result may be negative. This is safer than calling width() since width() might
overflow in its calculation.
@return fRight minus fLeft cast to int64_t
*/
int64_t width64() const { return (int64_t)fRight - (int64_t)fLeft; }
/** Returns span on the y-axis. This does not check if SkIRect is sorted, so the
result may be negative. This is safer than calling height() since height() might
overflow in its calculation.
@return fBottom minus fTop cast to int64_t
*/
int64_t height64() const { return (int64_t)fBottom - (int64_t)fTop; }
/** Returns true if fLeft is equal to or greater than fRight, or if fTop is equal
to or greater than fBottom. Call sort() to reverse rectangles with negative
width64() or height64().
@return true if width64() or height64() are zero or negative
*/
bool isEmpty64() const { return fRight <= fLeft || fBottom <= fTop; }
/** Returns true if width() or height() are zero or negative.
@return true if width() or height() are zero or negative
*/
bool isEmpty() const {
int64_t w = this->width64();
int64_t h = this->height64();
if (w <= 0 || h <= 0) {
return true;
}
// Return true if either exceeds int32_t
return !SkTFitsIn<int32_t>(w | h);
}
/** Returns true if all members in a: fLeft, fTop, fRight, and fBottom; are
identical to corresponding members in b.
@param a SkIRect to compare
@param b SkIRect to compare
@return true if members are equal
*/
friend bool operator==(const SkIRect& a, const SkIRect& b) {
return !memcmp(&a, &b, sizeof(a));
}
/** Returns true if any member in a: fLeft, fTop, fRight, and fBottom; is not
identical to the corresponding member in b.
@param a SkIRect to compare
@param b SkIRect to compare
@return true if members are not equal
*/
friend bool operator!=(const SkIRect& a, const SkIRect& b) {
return !(a == b);
}
/** Sets SkIRect to (0, 0, 0, 0).
Many other rectangles are empty; if left is equal to or greater than right,
or if top is equal to or greater than bottom. Setting all members to zero
is a convenience, but does not designate a special empty rectangle.
*/
void setEmpty() { memset(this, 0, sizeof(*this)); }
/** Sets SkIRect to (left, top, right, bottom).
left and right are not sorted; left is not necessarily less than right.
top and bottom are not sorted; top is not necessarily less than bottom.
@param left assigned to fLeft
@param top assigned to fTop
@param right assigned to fRight
@param bottom assigned to fBottom
*/
void set(int32_t left, int32_t top, int32_t right, int32_t bottom) {
fLeft = left;
fTop = top;
fRight = right;
fBottom = bottom;
}
/** Sets SkIRect to (left, top, right, bottom).
left and right are not sorted; left is not necessarily less than right.
top and bottom are not sorted; top is not necessarily less than bottom.
@param left stored in fLeft
@param top stored in fTop
@param right stored in fRight
@param bottom stored in fBottom
*/
void setLTRB(int32_t left, int32_t top, int32_t right, int32_t bottom) {
this->set(left, top, right, bottom);
}
/** Sets SkIRect to: (x, y, x + width, y + height).
Does not validate input; width or height may be negative.
@param x stored in fLeft
@param y stored in fTop
@param width added to x and stored in fRight
@param height added to y and stored in fBottom
*/
void setXYWH(int32_t x, int32_t y, int32_t width, int32_t height) {
fLeft = x;
fTop = y;
fRight = Sk32_sat_add(x, width);
fBottom = Sk32_sat_add(y, height);
}
/** Returns SkIRect offset by (dx, dy).
If dx is negative, SkIRect returned is moved to the left.
If dx is positive, SkIRect returned is moved to the right.
If dy is negative, SkIRect returned is moved upward.
If dy is positive, SkIRect returned is moved downward.
@param dx offset added to fLeft and fRight
@param dy offset added to fTop and fBottom
@return SkIRect offset by dx and dy, with original width and height
*/
SkIRect makeOffset(int32_t dx, int32_t dy) const {
return {
Sk32_sat_add(fLeft, dx), Sk32_sat_add(fTop, dy),
Sk32_sat_add(fRight, dx), Sk32_sat_add(fBottom, dy),
};
}
/** Returns SkIRect, inset by (dx, dy).
If dx is negative, SkIRect returned is wider.
If dx is positive, SkIRect returned is narrower.
If dy is negative, SkIRect returned is taller.
If dy is positive, SkIRect returned is shorter.
@param dx offset added to fLeft and subtracted from fRight
@param dy offset added to fTop and subtracted from fBottom
@return SkIRect inset symmetrically left and right, top and bottom
*/
SkIRect makeInset(int32_t dx, int32_t dy) const {
return {
Sk32_sat_add(fLeft, dx), Sk32_sat_add(fTop, dy),
Sk32_sat_sub(fRight, dx), Sk32_sat_sub(fBottom, dy),
};
}
/** Returns SkIRect, outset by (dx, dy).
If dx is negative, SkIRect returned is narrower.
If dx is positive, SkIRect returned is wider.
If dy is negative, SkIRect returned is shorter.
If dy is positive, SkIRect returned is taller.
@param dx offset subtracted to fLeft and added from fRight
@param dy offset subtracted to fTop and added from fBottom
@return SkIRect outset symmetrically left and right, top and bottom
*/
SkIRect makeOutset(int32_t dx, int32_t dy) const {
return {
Sk32_sat_sub(fLeft, dx), Sk32_sat_sub(fTop, dy),
Sk32_sat_add(fRight, dx), Sk32_sat_add(fBottom, dy),
};
}
/** Offsets SkIRect by adding dx to fLeft, fRight; and by adding dy to fTop, fBottom.
If dx is negative, moves SkIRect returned to the left.
If dx is positive, moves SkIRect returned to the right.
If dy is negative, moves SkIRect returned upward.
If dy is positive, moves SkIRect returned downward.
@param dx offset added to fLeft and fRight
@param dy offset added to fTop and fBottom
*/
void offset(int32_t dx, int32_t dy) {
fLeft = Sk32_sat_add(fLeft, dx);
fTop = Sk32_sat_add(fTop, dy);
fRight = Sk32_sat_add(fRight, dx);
fBottom = Sk32_sat_add(fBottom, dy);
}
/** Offsets SkIRect by adding delta.fX to fLeft, fRight; and by adding delta.fY to
fTop, fBottom.
If delta.fX is negative, moves SkIRect returned to the left.
If delta.fX is positive, moves SkIRect returned to the right.
If delta.fY is negative, moves SkIRect returned upward.
If delta.fY is positive, moves SkIRect returned downward.
@param delta offset added to SkIRect
*/
void offset(const SkIPoint& delta) {
this->offset(delta.fX, delta.fY);
}
/** Offsets SkIRect so that fLeft equals newX, and fTop equals newY. width and height
are unchanged.
@param newX stored in fLeft, preserving width()
@param newY stored in fTop, preserving height()
*/
void offsetTo(int32_t newX, int32_t newY) {
fRight = Sk64_pin_to_s32((int64_t)fRight + newX - fLeft);
fBottom = Sk64_pin_to_s32((int64_t)fBottom + newY - fTop);
fLeft = newX;
fTop = newY;
}
/** Insets SkIRect by (dx,dy).
If dx is positive, makes SkIRect narrower.
If dx is negative, makes SkIRect wider.
If dy is positive, makes SkIRect shorter.
If dy is negative, makes SkIRect taller.
@param dx offset added to fLeft and subtracted from fRight
@param dy offset added to fTop and subtracted from fBottom
*/
void inset(int32_t dx, int32_t dy) {
fLeft = Sk32_sat_add(fLeft, dx);
fTop = Sk32_sat_add(fTop, dy);
fRight = Sk32_sat_sub(fRight, dx);
fBottom = Sk32_sat_sub(fBottom, dy);
}
/** Outsets SkIRect by (dx, dy).
If dx is positive, makes SkIRect wider.
If dx is negative, makes SkIRect narrower.
If dy is positive, makes SkIRect taller.
If dy is negative, makes SkIRect shorter.
@param dx subtracted to fLeft and added from fRight
@param dy subtracted to fTop and added from fBottom
*/
void outset(int32_t dx, int32_t dy) { this->inset(-dx, -dy); }
/** Adjusts SkIRect by adding dL to fLeft, dT to fTop, dR to fRight, and dB to fBottom.
If dL is positive, narrows SkIRect on the left. If negative, widens it on the left.
If dT is positive, shrinks SkIRect on the top. If negative, lengthens it on the top.
If dR is positive, narrows SkIRect on the right. If negative, widens it on the right.
If dB is positive, shrinks SkIRect on the bottom. If negative, lengthens it on the bottom.
The resulting SkIRect is not checked for validity. Thus, if the resulting SkIRect left is
greater than right, the SkIRect will be considered empty. Call sort() after this call
if that is not the desired behavior.
@param dL offset added to fLeft
@param dT offset added to fTop
@param dR offset added to fRight
@param dB offset added to fBottom
*/
void adjust(int32_t dL, int32_t dT, int32_t dR, int32_t dB) {
fLeft = Sk32_sat_add(fLeft, dL);
fTop = Sk32_sat_add(fTop, dT);
fRight = Sk32_sat_add(fRight, dR);
fBottom = Sk32_sat_add(fBottom, dB);
}
/** Returns true if: fLeft <= x < fRight && fTop <= y < fBottom.
Returns false if SkIRect is empty.
Considers input to describe constructed SkIRect: (x, y, x + 1, y + 1) and
returns true if constructed area is completely enclosed by SkIRect area.
@param x test SkIPoint x-coordinate
@param y test SkIPoint y-coordinate
@return true if (x, y) is inside SkIRect
*/
bool contains(int32_t x, int32_t y) const {
return x >= fLeft && x < fRight && y >= fTop && y < fBottom;
}
/** Constructs SkIRect to intersect from (left, top, right, bottom). Does not sort
construction.
Returns true if SkIRect contains construction.
Returns false if SkIRect is empty or construction is empty.
@param left x-axis minimum of constructed SkIRect
@param top y-axis minimum of constructed SkIRect
@param right x-axis maximum of constructed SkIRect
@param bottom y-axis maximum of constructed SkIRect
@return true if all sides of SkIRect are outside construction
*/
bool contains(int32_t left, int32_t top, int32_t right, int32_t bottom) const {
return left < right && top < bottom && !this->isEmpty() && // check for empties
fLeft <= left && fTop <= top &&
fRight >= right && fBottom >= bottom;
}
/** Returns true if SkIRect contains r.
Returns false if SkIRect is empty or r is empty.
SkIRect contains r when SkIRect area completely includes r area.
@param r SkIRect contained
@return true if all sides of SkIRect are outside r
*/
bool contains(const SkIRect& r) const {
return !r.isEmpty() && !this->isEmpty() && // check for empties
fLeft <= r.fLeft && fTop <= r.fTop &&
fRight >= r.fRight && fBottom >= r.fBottom;
}
/** Returns true if SkIRect contains r.
Returns false if SkIRect is empty or r is empty.
SkIRect contains r when SkIRect area completely includes r area.
@param r SkRect contained
@return true if all sides of SkIRect are outside r
*/
bool contains(const SkRect& r) const;
/** Constructs SkIRect from (left, top, right, bottom). Does not sort
construction.
Returns true if SkIRect contains construction.
Asserts if SkIRect is empty or construction is empty, and if SK_DEBUG is defined.
Return is undefined if SkIRect is empty or construction is empty.
@param left x-axis minimum of constructed SkIRect
@param top y-axis minimum of constructed SkIRect
@param right x-axis maximum of constructed SkIRect
@param bottom y-axis maximum of constructed SkIRect
@return true if all sides of SkIRect are outside construction
*/
bool containsNoEmptyCheck(int32_t left, int32_t top,
int32_t right, int32_t bottom) const {
SkASSERT(fLeft < fRight && fTop < fBottom);
SkASSERT(left < right && top < bottom);
return fLeft <= left && fTop <= top &&
fRight >= right && fBottom >= bottom;
}
/** Returns true if SkIRect contains construction.
Asserts if SkIRect is empty or construction is empty, and if SK_DEBUG is defined.
Return is undefined if SkIRect is empty or construction is empty.
@param r SkIRect contained
@return true if all sides of SkIRect are outside r
*/
bool containsNoEmptyCheck(const SkIRect& r) const {
return containsNoEmptyCheck(r.fLeft, r.fTop, r.fRight, r.fBottom);
}
/** Returns true if SkIRect intersects r, and sets SkIRect to intersection.
Returns false if SkIRect does not intersect r, and leaves SkIRect unchanged.
Returns false if either r or SkIRect is empty, leaving SkIRect unchanged.
@param r limit of result
@return true if r and SkIRect have area in common
*/
bool intersect(const SkIRect& r) {
return this->intersect(*this, r);
}
/** Returns true if a intersects b, and sets SkIRect to intersection.
Returns false if a does not intersect b, and leaves SkIRect unchanged.
Asserts if either a or b is empty, and if SK_DEBUG is defined.
@param a SkIRect to intersect
@param b SkIRect to intersect
@return true if a and b have area in common
*/
bool SK_WARN_UNUSED_RESULT intersectNoEmptyCheck(const SkIRect& a, const SkIRect& b) {
SkASSERT(!a.isEmpty64() && !b.isEmpty64());
SkIRect r = {
SkMax32(a.fLeft, b.fLeft),
SkMax32(a.fTop, b.fTop),
SkMin32(a.fRight, b.fRight),
SkMin32(a.fBottom, b.fBottom)
};
if (r.isEmpty()) {
return false;
}
*this = r;
return true;
}
/** Returns true if a intersects b, and sets SkIRect to intersection.
Returns false if a does not intersect b, and leaves SkIRect unchanged.
Returns false if either a or b is empty, leaving SkIRect unchanged.
@param a SkIRect to intersect
@param b SkIRect to intersect
@return true if a and b have area in common
*/
bool SK_WARN_UNUSED_RESULT intersect(const SkIRect& a, const SkIRect& b) {
if (a.isEmpty64() || b.isEmpty64()) {
return false;
}
return this->intersectNoEmptyCheck(a, b);
}
/** Constructs SkIRect to intersect from (left, top, right, bottom). Does not sort
construction.
Returns true if SkIRect intersects construction, and sets SkIRect to intersection.
Returns false if SkIRect does not intersect construction, and leaves SkIRect unchanged.
Returns false if either construction or SkIRect is empty, leaving SkIRect unchanged.
@param left x-axis minimum of constructed SkIRect
@param top y-axis minimum of constructed SkIRect
@param right x-axis maximum of constructed SkIRect
@param bottom y-axis maximum of constructed SkIRect
@return true if construction and SkIRect have area in common
*/
bool intersect(int32_t left, int32_t top, int32_t right, int32_t bottom) {
return this->intersect(*this, {left, top, right, bottom});
}
/** Returns true if a intersects b.
Returns false if either a or b is empty, or do not intersect.
@param a SkIRect to intersect
@param b SkIRect to intersect
@return true if a and b have area in common
*/
static bool Intersects(const SkIRect& a, const SkIRect& b) {
SkIRect dummy;
return dummy.intersect(a, b);
}
/** Returns true if a intersects b.
Asserts if either a or b is empty, and if SK_DEBUG is defined.
@param a SkIRect to intersect
@param b SkIRect to intersect
@return true if a and b have area in common
*/
static bool IntersectsNoEmptyCheck(const SkIRect& a, const SkIRect& b) {
SkIRect dummy;
return dummy.intersectNoEmptyCheck(a, b);
}
/** Constructs SkIRect to intersect from (left, top, right, bottom). Does not sort
construction.
Sets SkIRect to the union of itself and the construction.
Has no effect if construction is empty. Otherwise, if SkIRect is empty, sets
SkIRect to construction.
@param left x-axis minimum of constructed SkIRect
@param top y-axis minimum of constructed SkIRect
@param right x-axis maximum of constructed SkIRect
@param bottom y-axis maximum of constructed SkIRect
*/
void join(int32_t left, int32_t top, int32_t right, int32_t bottom);
/** Sets SkIRect to the union of itself and r.
Has no effect if r is empty. Otherwise, if SkIRect is empty, sets SkIRect to r.
@param r expansion SkIRect
*/
void join(const SkIRect& r) {
this->join(r.fLeft, r.fTop, r.fRight, r.fBottom);
}
/** Swaps fLeft and fRight if fLeft is greater than fRight; and swaps
fTop and fBottom if fTop is greater than fBottom. Result may be empty,
and width() and height() will be zero or positive.
*/
void sort() {
using std::swap;
if (fLeft > fRight) {
swap(fLeft, fRight);
}
if (fTop > fBottom) {
swap(fTop, fBottom);
}
}
/** Returns SkIRect with fLeft and fRight swapped if fLeft is greater than fRight; and
with fTop and fBottom swapped if fTop is greater than fBottom. Result may be empty;
and width() and height() will be zero or positive.
@return sorted SkIRect
*/
SkIRect makeSorted() const {
return MakeLTRB(SkMin32(fLeft, fRight), SkMin32(fTop, fBottom),
SkMax32(fLeft, fRight), SkMax32(fTop, fBottom));
}
/** Returns a reference to immutable empty SkIRect, set to (0, 0, 0, 0).
@return global SkIRect set to all zeroes
*/
static const SkIRect& SK_WARN_UNUSED_RESULT EmptyIRect() {
static const SkIRect gEmpty = { 0, 0, 0, 0 };
return gEmpty;
}
};
/** \struct SkRect
SkRect holds four SkScalar coordinates describing the upper and
lower bounds of a rectangle. SkRect may be created from outer bounds or
from position, width, and height. SkRect describes an area; if its right
is less than or equal to its left, or if its bottom is less than or equal to
its top, it is considered empty.
*/
struct SK_API SkRect {
SkScalar fLeft; //!< smaller x-axis bounds
SkScalar fTop; //!< smaller y-axis bounds
SkScalar fRight; //!< larger x-axis bounds
SkScalar fBottom; //!< larger y-axis bounds
/** Returns constructed SkRect set to (0, 0, 0, 0).
Many other rectangles are empty; if left is equal to or greater than right,
or if top is equal to or greater than bottom. Setting all members to zero
is a convenience, but does not designate a special empty rectangle.
@return bounds (0, 0, 0, 0)
*/
static constexpr SkRect SK_WARN_UNUSED_RESULT MakeEmpty() {
return SkRect{0, 0, 0, 0};
}
/** Returns constructed SkRect set to SkScalar values (0, 0, w, h). Does not
validate input; w or h may be negative.
Passing integer values may generate a compiler warning since SkRect cannot
represent 32-bit integers exactly. Use SkIRect for an exact integer rectangle.
@param w SkScalar width of constructed SkRect
@param h SkScalar height of constructed SkRect
@return bounds (0, 0, w, h)
*/
static constexpr SkRect SK_WARN_UNUSED_RESULT MakeWH(SkScalar w, SkScalar h) {
return SkRect{0, 0, w, h};
}
/** Returns constructed SkRect set to integer values (0, 0, w, h). Does not validate
input; w or h may be negative.
Use to avoid a compiler warning that input may lose precision when stored.
Use SkIRect for an exact integer rectangle.
@param w integer width of constructed SkRect
@param h integer height of constructed SkRect
@return bounds (0, 0, w, h)
*/
static SkRect SK_WARN_UNUSED_RESULT MakeIWH(int w, int h) {
SkRect r;
r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h));
return r;
}
/** Returns constructed SkRect set to (0, 0, size.width(), size.height()). Does not
validate input; size.width() or size.height() may be negative.
@param size SkScalar values for SkRect width and height
@return bounds (0, 0, size.width(), size.height())
*/
static constexpr SkRect SK_WARN_UNUSED_RESULT MakeSize(const SkSize& size) {
return SkRect{0, 0, size.fWidth, size.fHeight};
}
/** Returns constructed SkRect set to (l, t, r, b). Does not sort input; SkRect may
result in fLeft greater than fRight, or fTop greater than fBottom.
@param l SkScalar stored in fLeft
@param t SkScalar stored in fTop
@param r SkScalar stored in fRight
@param b SkScalar stored in fBottom
@return bounds (l, t, r, b)
*/
static constexpr SkRect SK_WARN_UNUSED_RESULT MakeLTRB(SkScalar l, SkScalar t, SkScalar r,
SkScalar b) {
return SkRect {l, t, r, b};
}
/** Returns constructed SkRect set to (x, y, x + w, y + h).
Does not validate input; w or h may be negative.
@param x stored in fLeft
@param y stored in fTop
@param w added to x and stored in fRight
@param h added to y and stored in fBottom
@return bounds at (x, y) with width w and height h
*/
static constexpr SkRect SK_WARN_UNUSED_RESULT MakeXYWH(SkScalar x, SkScalar y, SkScalar w,
SkScalar h) {
return SkRect {x, y, x + w, y + h};
}
/** Returns constructed SkIRect set to (0, 0, size.width(), size.height()).
Does not validate input; size.width() or size.height() may be negative.
@param size integer values for SkRect width and height
@return bounds (0, 0, size.width(), size.height())
*/
static SkRect Make(const SkISize& size) {
return MakeIWH(size.width(), size.height());
}
/** Returns constructed SkIRect set to irect, promoting integers to scalar.
Does not validate input; fLeft may be greater than fRight, fTop may be greater
than fBottom.
@param irect integer unsorted bounds
@return irect members converted to SkScalar
*/
static SkRect SK_WARN_UNUSED_RESULT Make(const SkIRect& irect) {
SkRect r;
r.set(SkIntToScalar(irect.fLeft),
SkIntToScalar(irect.fTop),
SkIntToScalar(irect.fRight),
SkIntToScalar(irect.fBottom));
return r;
}
/** Returns true if fLeft is equal to or greater than fRight, or if fTop is equal
to or greater than fBottom. Call sort() to reverse rectangles with negative
width() or height().
@return true if width() or height() are zero or negative
*/
bool isEmpty() const {
// We write it as the NOT of a non-empty rect, so we will return true if any values
// are NaN.
return !(fLeft < fRight && fTop < fBottom);
}
/** Returns true if fLeft is equal to or less than fRight, or if fTop is equal
to or less than fBottom. Call sort() to reverse rectangles with negative
width() or height().
@return true if width() or height() are zero or positive
*/
bool isSorted() const { return fLeft <= fRight && fTop <= fBottom; }
/** Returns true if all values in the rectangle are finite: SK_ScalarMin or larger,
and SK_ScalarMax or smaller.
@return true if no member is infinite or NaN
*/
bool isFinite() const {
float accum = 0;
accum *= fLeft;
accum *= fTop;
accum *= fRight;
accum *= fBottom;
// accum is either NaN or it is finite (zero).
SkASSERT(0 == accum || SkScalarIsNaN(accum));
// value==value will be true iff value is not NaN
// TODO: is it faster to say !accum or accum==accum?
return !SkScalarIsNaN(accum);
}
/** Returns left edge of SkRect, if sorted. Call isSorted() to see if SkRect is valid.
Call sort() to reverse fLeft and fRight if needed.
@return fLeft
*/
SkScalar x() const { return fLeft; }
/** Returns top edge of SkRect, if sorted. Call isEmpty() to see if SkRect may be invalid,
and sort() to reverse fTop and fBottom if needed.
@return fTop
*/
SkScalar y() const { return fTop; }
/** Returns left edge of SkRect, if sorted. Call isSorted() to see if SkRect is valid.
Call sort() to reverse fLeft and fRight if needed.
@return fLeft
*/
SkScalar left() const { return fLeft; }
/** Returns top edge of SkRect, if sorted. Call isEmpty() to see if SkRect may be invalid,
and sort() to reverse fTop and fBottom if needed.
@return fTop
*/
SkScalar top() const { return fTop; }
/** Returns right edge of SkRect, if sorted. Call isSorted() to see if SkRect is valid.
Call sort() to reverse fLeft and fRight if needed.
@return fRight
*/
SkScalar right() const { return fRight; }
/** Returns bottom edge of SkRect, if sorted. Call isEmpty() to see if SkRect may be invalid,
and sort() to reverse fTop and fBottom if needed.
@return fBottom
*/
SkScalar bottom() const { return fBottom; }
/** Returns span on the x-axis. This does not check if SkRect is sorted, or if
result fits in 32-bit float; result may be negative or infinity.
@return fRight minus fLeft
*/
SkScalar width() const { return fRight - fLeft; }
/** Returns span on the y-axis. This does not check if SkRect is sorted, or if
result fits in 32-bit float; result may be negative or infinity.
@return fBottom minus fTop
*/
SkScalar height() const { return fBottom - fTop; }
/** Returns average of left edge and right edge. Result does not change if SkRect
is sorted. Result may overflow to infinity if SkRect is far from the origin.
@return midpoint on x-axis
*/
SkScalar centerX() const {
// don't use SkScalarHalf(fLeft + fBottom) as that might overflow before the 0.5
return SkScalarHalf(fLeft) + SkScalarHalf(fRight);
}
/** Returns average of top edge and bottom edge. Result does not change if SkRect
is sorted.
@return midpoint on y-axis
*/
SkScalar centerY() const {
// don't use SkScalarHalf(fTop + fBottom) as that might overflow before the 0.5
return SkScalarHalf(fTop) + SkScalarHalf(fBottom);
}
/** Returns true if all members in a: fLeft, fTop, fRight, and fBottom; are
equal to the corresponding members in b.
a and b are not equal if either contain NaN. a and b are equal if members
contain zeroes with different signs.
@param a SkRect to compare
@param b SkRect to compare
@return true if members are equal
*/
friend bool operator==(const SkRect& a, const SkRect& b) {
return SkScalarsEqual((const SkScalar*)&a, (const SkScalar*)&b, 4);
}
/** Returns true if any in a: fLeft, fTop, fRight, and fBottom; does not
equal the corresponding members in b.
a and b are not equal if either contain NaN. a and b are equal if members
contain zeroes with different signs.
@param a SkRect to compare
@param b SkRect to compare
@return true if members are not equal
*/
friend bool operator!=(const SkRect& a, const SkRect& b) {
return !SkScalarsEqual((const SkScalar*)&a, (const SkScalar*)&b, 4);
}
/** Returns four points in quad that enclose SkRect ordered as: top-left, top-right,
bottom-right, bottom-left.
TODO: Consider adding parameter to control whether quad is clockwise or counterclockwise.
@param quad storage for corners of SkRect
*/
void toQuad(SkPoint quad[4]) const;
/** Sets SkRect to (0, 0, 0, 0).
Many other rectangles are empty; if left is equal to or greater than right,
or if top is equal to or greater than bottom. Setting all members to zero
is a convenience, but does not designate a special empty rectangle.
*/
void setEmpty() { *this = MakeEmpty(); }
/** Sets SkRect to src, promoting src members from integer to scalar.
Very large values in src may lose precision.
@param src integer SkRect
*/
void set(const SkIRect& src) {
fLeft = SkIntToScalar(src.fLeft);
fTop = SkIntToScalar(src.fTop);
fRight = SkIntToScalar(src.fRight);
fBottom = SkIntToScalar(src.fBottom);
}
/** Sets SkRect to (left, top, right, bottom).
left and right are not sorted; left is not necessarily less than right.
top and bottom are not sorted; top is not necessarily less than bottom.
@param left stored in fLeft
@param top stored in fTop
@param right stored in fRight
@param bottom stored in fBottom
*/
void set(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) {
fLeft = left;
fTop = top;
fRight = right;
fBottom = bottom;
}
/** Sets SkRect to (left, top, right, bottom).
left and right are not sorted; left is not necessarily less than right.
top and bottom are not sorted; top is not necessarily less than bottom.
@param left stored in fLeft
@param top stored in fTop
@param right stored in fRight
@param bottom stored in fBottom
*/
void setLTRB(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) {
this->set(left, top, right, bottom);
}
/** Sets SkRect to (left, top, right, bottom).
All parameters are promoted from integer to scalar.
left and right are not sorted; left is not necessarily less than right.
top and bottom are not sorted; top is not necessarily less than bottom.
@param left promoted to SkScalar and stored in fLeft
@param top promoted to SkScalar and stored in fTop
@param right promoted to SkScalar and stored in fRight
@param bottom promoted to SkScalar and stored in fBottom
*/
void iset(int left, int top, int right, int bottom) {
fLeft = SkIntToScalar(left);
fTop = SkIntToScalar(top);
fRight = SkIntToScalar(right);
fBottom = SkIntToScalar(bottom);
}
/** Sets SkRect to (0, 0, width, height).
width and height may be zero or negative. width and height are promoted from
integer to SkScalar, large values may lose precision.
@param width promoted to SkScalar and stored in fRight
@param height promoted to SkScalar and stored in fBottom
*/
void isetWH(int width, int height) {
fLeft = fTop = 0;
fRight = SkIntToScalar(width);
fBottom = SkIntToScalar(height);
}
/** Sets to bounds of SkPoint array with count entries. If count is zero or smaller,
or if SkPoint array contains an infinity or NaN, sets SkRect to (0, 0, 0, 0).
Result is either empty or sorted: fLeft is less than or equal to fRight, and
fTop is less than or equal to fBottom.
@param pts SkPoint array
@param count entries in array
*/
void set(const SkPoint pts[], int count) {
// set() had been checking for non-finite values, so keep that behavior
// for now. Now that we have setBoundsCheck(), we may decide to make
// set() be simpler/faster, and not check for those.
(void)this->setBoundsCheck(pts, count);
}
/** Sets to bounds of SkPoint array with count entries. If count is zero or smaller,
or if SkPoint array contains an infinity or NaN, sets to (0, 0, 0, 0).
Result is either empty or sorted: fLeft is less than or equal to fRight, and
fTop is less than or equal to fBottom.
@param pts SkPoint array
@param count entries in array
*/
void setBounds(const SkPoint pts[], int count) {
(void)this->setBoundsCheck(pts, count);
}
/** Sets to bounds of SkPoint array with count entries. Returns false if count is
zero or smaller, or if SkPoint array contains an infinity or NaN; in these cases
sets SkRect to (0, 0, 0, 0).
Result is either empty or sorted: fLeft is less than or equal to fRight, and
fTop is less than or equal to fBottom.
@param pts SkPoint array
@param count entries in array
@return true if all SkPoint values are finite
*/
bool setBoundsCheck(const SkPoint pts[], int count);
/** Sets to bounds of SkPoint pts array with count entries. If any SkPoint in pts
contains infinity or NaN, all SkRect dimensions are set to NaN.
@param pts SkPoint array
@param count entries in array
*/
void setBoundsNoCheck(const SkPoint pts[], int count);
/** Sets bounds to the smallest SkRect enclosing SkPoint p0 and p1. The result is
sorted and may be empty. Does not check to see if values are finite.
@param p0 corner to include
@param p1 corner to include
*/
void set(const SkPoint& p0, const SkPoint& p1) {
fLeft = SkMinScalar(p0.fX, p1.fX);
fRight = SkMaxScalar(p0.fX, p1.fX);
fTop = SkMinScalar(p0.fY, p1.fY);
fBottom = SkMaxScalar(p0.fY, p1.fY);
}
/** Sets SkRect to (x, y, x + width, y + height).
Does not validate input; width or height may be negative.
@param x stored in fLeft
@param y stored in fTop
@param width added to x and stored in fRight
@param height added to y and stored in fBottom
*/
void setXYWH(SkScalar x, SkScalar y, SkScalar width, SkScalar height) {
fLeft = x;
fTop = y;
fRight = x + width;
fBottom = y + height;
}
/** Sets SkRect to (0, 0, width, height). Does not validate input;
width or height may be negative.
@param width stored in fRight
@param height stored in fBottom
*/
void setWH(SkScalar width, SkScalar height) {
fLeft = 0;
fTop = 0;
fRight = width;
fBottom = height;
}
/** Returns SkRect offset by (dx, dy).
If dx is negative, SkRect returned is moved to the left.
If dx is positive, SkRect returned is moved to the right.
If dy is negative, SkRect returned is moved upward.
If dy is positive, SkRect returned is moved downward.
@param dx added to fLeft and fRight
@param dy added to fTop and fBottom
@return SkRect offset on axes, with original width and height
*/
SkRect makeOffset(SkScalar dx, SkScalar dy) const {
return MakeLTRB(fLeft + dx, fTop + dy, fRight + dx, fBottom + dy);
}
/** Returns SkRect, inset by (dx, dy).
If dx is negative, SkRect returned is wider.
If dx is positive, SkRect returned is narrower.
If dy is negative, SkRect returned is taller.
If dy is positive, SkRect returned is shorter.
@param dx added to fLeft and subtracted from fRight
@param dy added to fTop and subtracted from fBottom
@return SkRect inset symmetrically left and right, top and bottom
*/
SkRect makeInset(SkScalar dx, SkScalar dy) const {
return MakeLTRB(fLeft + dx, fTop + dy, fRight - dx, fBottom - dy);
}
/** Returns SkRect, outset by (dx, dy).
If dx is negative, SkRect returned is narrower.
If dx is positive, SkRect returned is wider.
If dy is negative, SkRect returned is shorter.
If dy is positive, SkRect returned is taller.
@param dx subtracted to fLeft and added from fRight
@param dy subtracted to fTop and added from fBottom
@return SkRect outset symmetrically left and right, top and bottom
*/
SkRect makeOutset(SkScalar dx, SkScalar dy) const {
return MakeLTRB(fLeft - dx, fTop - dy, fRight + dx, fBottom + dy);
}
/** Offsets SkRect by adding dx to fLeft, fRight; and by adding dy to fTop, fBottom.
If dx is negative, moves SkRect to the left.
If dx is positive, moves SkRect to the right.
If dy is negative, moves SkRect upward.
If dy is positive, moves SkRect downward.
@param dx offset added to fLeft and fRight
@param dy offset added to fTop and fBottom
*/
void offset(SkScalar dx, SkScalar dy) {
fLeft += dx;
fTop += dy;
fRight += dx;
fBottom += dy;
}
/** Offsets SkRect by adding delta.fX to fLeft, fRight; and by adding delta.fY to
fTop, fBottom.
If delta.fX is negative, moves SkRect to the left.
If delta.fX is positive, moves SkRect to the right.
If delta.fY is negative, moves SkRect upward.
If delta.fY is positive, moves SkRect downward.
@param delta added to SkRect
*/
void offset(const SkPoint& delta) {
this->offset(delta.fX, delta.fY);
}
/** Offsets SkRect so that fLeft equals newX, and fTop equals newY. width and height
are unchanged.
@param newX stored in fLeft, preserving width()
@param newY stored in fTop, preserving height()
*/
void offsetTo(SkScalar newX, SkScalar newY) {
fRight += newX - fLeft;
fBottom += newY - fTop;
fLeft = newX;
fTop = newY;
}
/** Insets SkRect by (dx, dy).
If dx is positive, makes SkRect narrower.
If dx is negative, makes SkRect wider.
If dy is positive, makes SkRect shorter.
If dy is negative, makes SkRect taller.
@param dx added to fLeft and subtracted from fRight
@param dy added to fTop and subtracted from fBottom
*/
void inset(SkScalar dx, SkScalar dy) {
fLeft += dx;
fTop += dy;
fRight -= dx;
fBottom -= dy;
}
/** Outsets SkRect by (dx, dy).
If dx is positive, makes SkRect wider.
If dx is negative, makes SkRect narrower.
If dy is positive, makes SkRect taller.
If dy is negative, makes SkRect shorter.
@param dx subtracted to fLeft and added from fRight
@param dy subtracted to fTop and added from fBottom
*/
void outset(SkScalar dx, SkScalar dy) { this->inset(-dx, -dy); }
/** Returns true if SkRect intersects r, and sets SkRect to intersection.
Returns false if SkRect does not intersect r, and leaves SkRect unchanged.
Returns false if either r or SkRect is empty, leaving SkRect unchanged.
@param r limit of result
@return true if r and SkRect have area in common
*/
bool intersect(const SkRect& r);
/** Constructs SkRect to intersect from (left, top, right, bottom). Does not sort
construction.
Returns true if SkRect intersects construction, and sets SkRect to intersection.
Returns false if SkRect does not intersect construction, and leaves SkRect unchanged.
Returns false if either construction or SkRect is empty, leaving SkRect unchanged.
@param left x-axis minimum of constructed SkRect
@param top y-axis minimum of constructed SkRect
@param right x-axis maximum of constructed SkRect
@param bottom y-axis maximum of constructed SkRect
@return true if construction and SkRect have area in common
*/
bool intersect(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom);
/** Returns true if a intersects b, and sets SkRect to intersection.
Returns false if a does not intersect b, and leaves SkRect unchanged.
Returns false if either a or b is empty, leaving SkRect unchanged.
@param a SkRect to intersect
@param b SkRect to intersect
@return true if a and b have area in common
*/
bool SK_WARN_UNUSED_RESULT intersect(const SkRect& a, const SkRect& b);
private:
static bool Intersects(SkScalar al, SkScalar at, SkScalar ar, SkScalar ab,
SkScalar bl, SkScalar bt, SkScalar br, SkScalar bb) {
SkScalar L = SkMaxScalar(al, bl);
SkScalar R = SkMinScalar(ar, br);
SkScalar T = SkMaxScalar(at, bt);
SkScalar B = SkMinScalar(ab, bb);
return L < R && T < B;
}
public:
/** Constructs SkRect to intersect from (left, top, right, bottom). Does not sort
construction.
Returns true if SkRect intersects construction.
Returns false if either construction or SkRect is empty, or do not intersect.
@param left x-axis minimum of constructed SkRect
@param top y-axis minimum of constructed SkRect
@param right x-axis maximum of constructed SkRect
@param bottom y-axis maximum of constructed SkRect
@return true if construction and SkRect have area in common
*/
bool intersects(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) const {
return Intersects(fLeft, fTop, fRight, fBottom, left, top, right, bottom);
}
/** Returns true if SkRect intersects r.
Returns false if either r or SkRect is empty, or do not intersect.
@param r SkRect to intersect
@return true if r and SkRect have area in common
*/
bool intersects(const SkRect& r) const {
return Intersects(fLeft, fTop, fRight, fBottom,
r.fLeft, r.fTop, r.fRight, r.fBottom);
}
/** Returns true if a intersects b.
Returns false if either a or b is empty, or do not intersect.
@param a SkRect to intersect
@param b SkRect to intersect
@return true if a and b have area in common
*/
static bool Intersects(const SkRect& a, const SkRect& b) {
return Intersects(a.fLeft, a.fTop, a.fRight, a.fBottom,
b.fLeft, b.fTop, b.fRight, b.fBottom);
}
/** Constructs SkRect to intersect from (left, top, right, bottom). Does not sort
construction.
Sets SkRect to the union of itself and the construction.
Has no effect if construction is empty. Otherwise, if SkRect is empty, sets
SkRect to construction.
@param left x-axis minimum of constructed SkRect
@param top y-axis minimum of constructed SkRect
@param right x-axis maximum of constructed SkRect
@param bottom y-axis maximum of constructed SkRect
*/
void join(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom);
/** Sets SkRect to the union of itself and r.
Has no effect if r is empty. Otherwise, if SkRect is empty, sets
SkRect to r.
@param r expansion SkRect
*/
void join(const SkRect& r) {
this->join(r.fLeft, r.fTop, r.fRight, r.fBottom);
}
/** Sets SkRect to the union of itself and r.
Asserts if r is empty and SK_DEBUG is defined.
If SkRect is empty, sets SkRect to r.
May produce incorrect results if r is empty.
@param r expansion SkRect
*/
void joinNonEmptyArg(const SkRect& r) {
SkASSERT(!r.isEmpty());
// if we are empty, just assign
if (fLeft >= fRight || fTop >= fBottom) {
*this = r;
} else {
this->joinPossiblyEmptyRect(r);
}
}
/** Sets SkRect to the union of itself and the construction.
May produce incorrect results if SkRect or r is empty.
@param r expansion SkRect
*/
void joinPossiblyEmptyRect(const SkRect& r) {
fLeft = SkMinScalar(fLeft, r.left());
fTop = SkMinScalar(fTop, r.top());
fRight = SkMaxScalar(fRight, r.right());
fBottom = SkMaxScalar(fBottom, r.bottom());
}
/** Returns true if: fLeft <= x < fRight && fTop <= y < fBottom.
Returns false if SkRect is empty.
@param x test SkPoint x-coordinate
@param y test SkPoint y-coordinate
@return true if (x, y) is inside SkRect
*/
bool contains(SkScalar x, SkScalar y) const {
return x >= fLeft && x < fRight && y >= fTop && y < fBottom;
}
/** Returns true if SkRect contains r.
Returns false if SkRect is empty or r is empty.
SkRect contains r when SkRect area completely includes r area.
@param r SkRect contained
@return true if all sides of SkRect are outside r
*/
bool contains(const SkRect& r) const {
// todo: can we eliminate the this->isEmpty check?
return !r.isEmpty() && !this->isEmpty() &&
fLeft <= r.fLeft && fTop <= r.fTop &&
fRight >= r.fRight && fBottom >= r.fBottom;
}
/** Returns true if SkRect contains r.
Returns false if SkRect is empty or r is empty.
SkRect contains r when SkRect area completely includes r area.
@param r SkIRect contained
@return true if all sides of SkRect are outside r
*/
bool contains(const SkIRect& r) const {
// todo: can we eliminate the this->isEmpty check?
return !r.isEmpty() && !this->isEmpty() &&
fLeft <= SkIntToScalar(r.fLeft) && fTop <= SkIntToScalar(r.fTop) &&
fRight >= SkIntToScalar(r.fRight) && fBottom >= SkIntToScalar(r.fBottom);
}
/** Sets SkIRect by adding 0.5 and discarding the fractional portion of SkRect
members, using (SkScalarRoundToInt(fLeft), SkScalarRoundToInt(fTop),
SkScalarRoundToInt(fRight), SkScalarRoundToInt(fBottom)).
@param dst storage for SkIRect
*/
void round(SkIRect* dst) const {
SkASSERT(dst);
dst->set(SkScalarRoundToInt(fLeft), SkScalarRoundToInt(fTop),
SkScalarRoundToInt(fRight), SkScalarRoundToInt(fBottom));
}
/** Sets SkIRect by discarding the fractional portion of fLeft and fTop; and rounding
up fRight and fBottom, using
(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom)).
@param dst storage for SkIRect
*/
void roundOut(SkIRect* dst) const {
SkASSERT(dst);
dst->set(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom));
}
/** Sets SkRect by discarding the fractional portion of fLeft and fTop; and rounding
up fRight and fBottom, using
(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom)).
@param dst storage for SkRect
*/
void roundOut(SkRect* dst) const {
dst->set(SkScalarFloorToScalar(fLeft),
SkScalarFloorToScalar(fTop),
SkScalarCeilToScalar(fRight),
SkScalarCeilToScalar(fBottom));
}
/** Sets SkRect by rounding up fLeft and fTop; and discarding the fractional portion
of fRight and fBottom, using
(SkScalarCeilToInt(fLeft), SkScalarCeilToInt(fTop),
SkScalarFloorToInt(fRight), SkScalarFloorToInt(fBottom)).
@param dst storage for SkIRect
*/
void roundIn(SkIRect* dst) const {
SkASSERT(dst);
dst->set(SkScalarCeilToInt(fLeft), SkScalarCeilToInt(fTop),
SkScalarFloorToInt(fRight), SkScalarFloorToInt(fBottom));
}
/** Returns SkIRect by adding 0.5 and discarding the fractional portion of SkRect
members, using (SkScalarRoundToInt(fLeft), SkScalarRoundToInt(fTop),
SkScalarRoundToInt(fRight), SkScalarRoundToInt(fBottom)).
@return rounded SkIRect
*/
SkIRect round() const {
SkIRect ir;
this->round(&ir);
return ir;
}
/** Sets SkIRect by discarding the fractional portion of fLeft and fTop; and rounding
up fRight and fBottom, using
(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom)).
@return rounded SkIRect
*/
SkIRect roundOut() const {
SkIRect ir;
this->roundOut(&ir);
return ir;
}
/** Swaps fLeft and fRight if fLeft is greater than fRight; and swaps
fTop and fBottom if fTop is greater than fBottom. Result may be empty;
and width() and height() will be zero or positive.
*/
void sort() {
using std::swap;
if (fLeft > fRight) {
swap(fLeft, fRight);
}
if (fTop > fBottom) {
swap(fTop, fBottom);
}
}
/** Returns SkRect with fLeft and fRight swapped if fLeft is greater than fRight; and
with fTop and fBottom swapped if fTop is greater than fBottom. Result may be empty;
and width() and height() will be zero or positive.
@return sorted SkRect
*/
SkRect makeSorted() const {
return MakeLTRB(SkMinScalar(fLeft, fRight), SkMinScalar(fTop, fBottom),
SkMaxScalar(fLeft, fRight), SkMaxScalar(fTop, fBottom));
}
/** Returns pointer to first scalar in SkRect, to treat it as an array with four
entries.
@return pointer to fLeft
*/
const SkScalar* asScalars() const { return &fLeft; }
/** Writes text representation of SkRect to standard output. Set asHex to true to
generate exact binary representations of floating point numbers.
@param asHex true if SkScalar values are written as hexadecimal
*/
void dump(bool asHex) const;
/** Writes text representation of SkRect to standard output. The representation may be
directly compiled as C++ code. Floating point values are written
with limited precision; it may not be possible to reconstruct original SkRect
from output.
*/
void dump() const { this->dump(false); }
/** Writes text representation of SkRect to standard output. The representation may be
directly compiled as C++ code. Floating point values are written
in hexadecimal to preserve their exact bit pattern. The output reconstructs the
original SkRect.
Use instead of dump() when submitting
*/
void dumpHex() const { this->dump(true); }
};
inline bool SkIRect::contains(const SkRect& r) const {
return !r.isEmpty() && !this->isEmpty() && // check for empties
(SkScalar)fLeft <= r.fLeft && (SkScalar)fTop <= r.fTop &&
(SkScalar)fRight >= r.fRight && (SkScalar)fBottom >= r.fBottom;
}
#endif
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