skia2/docs/SkIRect_Reference.bmh

#Topic IRect
#Alias IRects ##
#Alias IRect_Reference ##

#Struct SkIRect

#Code
#Populate
##

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.

#Member int32_t  fLeft
#Line # smaller x-axis bounds ##
May contain any value. The smaller of the horizontal values when sorted.
When equal to or greater than fRight, IRect is empty.
##

#Member int32_t  fTop
#Line # smaller y-axis bounds ##
May contain any value. The smaller of the horizontal values when sorted.
When equal to or greater than fBottom, IRect is empty.
##

#Member int32_t  fRight
#Line # larger x-axis bounds ##
May contain any value. The larger of the vertical values when sorted.
When equal to or less than fLeft, IRect is empty.
##

#Member int32_t  fBottom
#Line # larger y-axis bounds ##
May contain any value. The larger of the vertical values when sorted.
When equal to or less than fTop, IRect is empty.
##

# ------------------------------------------------------------------------------

#Method static constexpr SkIRect MakeEmpty()

#In Constructors
#Line # returns bounds of (0, 0, 0, 0) ##
#Populate

#Example
    SkIRect rect = SkIRect::MakeEmpty();
    SkDebugf("MakeEmpty isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
    rect.offset(10, 10);
    SkDebugf("offset rect isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
    rect.inset(10, 10);
    SkDebugf("inset rect isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
    rect.outset(20, 20);
    SkDebugf("outset rect isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
#StdOut
MakeEmpty isEmpty: true
offset rect isEmpty: true
inset rect isEmpty: true
outset rect isEmpty: false
##
##

#SeeAlso EmptyIRect isEmpty setEmpty SkRect::MakeEmpty

##

# ------------------------------------------------------------------------------

#Method static constexpr SkIRect MakeWH(int32_t w, int32_t h)

#In Constructors
#Line # constructs from int input returning (0, 0, width, height) ##
#Populate

#Example
    SkIRect rect1 = SkIRect::MakeWH(25, 35);
    SkIRect rect2 = SkIRect::MakeSize({25, 35});
    SkIRect rect3 = SkIRect::MakeXYWH(0, 0, 25, 35);
    SkIRect rect4 = SkIRect::MakeLTRB(0, 0, 25, 35);
    SkDebugf("all %s" "equal\n", rect1 == rect2 && rect2 == rect3 && rect3 == rect4 ?
             "" : "not ");
#StdOut
all equal
##
##

#SeeAlso MakeSize MakeXYWH SkRect::MakeWH SkRect::MakeIWH

##

# ------------------------------------------------------------------------------

#Method static constexpr SkIRect MakeSize(const SkISize& size)

#In Constructors
#Line # constructs from ISize returning (0, 0, width, height) ##
#Populate

#Example
    SkSize size = {25.5f, 35.5f};
    SkIRect rect = SkIRect::MakeSize(size.toRound());
    SkDebugf("round width: %d  height: %d\n", rect.width(), rect.height());
    rect = SkIRect::MakeSize(size.toFloor());
    SkDebugf("floor width: %d  height: %d\n", rect.width(), rect.height());
#StdOut
round width: 26  height: 36
floor width: 25  height: 35
##
##

#SeeAlso MakeWH MakeXYWH SkRect::Make SkRect::MakeIWH

##

# ------------------------------------------------------------------------------

#Method static constexpr SkIRect MakeLTRB(int32_t l, int32_t t, int32_t r, int32_t b)

#In Constructors
#Line # constructs from int left, top, right, bottom ##
#Populate

#Example
    SkIRect rect = SkIRect::MakeLTRB(5, 35, 15, 25);
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect.sort();
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
#StdOut
rect: 5, 35, 15, 25  isEmpty: true
rect: 5, 25, 15, 35  isEmpty: false
##
##

#SeeAlso MakeXYWH SkRect::MakeLTRB

##

# ------------------------------------------------------------------------------

#Method static constexpr SkIRect MakeXYWH(int32_t x, int32_t y, int32_t w, int32_t h)

#In Constructors
#Line # constructs from int input returning (x, y, width, height) ##

#Populate

#Example
    SkIRect rect = SkIRect::MakeXYWH(5, 35, -15, 25);
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect.sort();
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
#StdOut
rect: 5, 35, -10, 60  isEmpty: true
rect: -10, 35, 5, 60  isEmpty: false
##
##

#SeeAlso MakeLTRB SkRect::MakeXYWH

##

#Subtopic Property
#Line # member values, center, validity ##
##

# ------------------------------------------------------------------------------

#Method int32_t left() const

#In Property
#Line # returns smaller bounds in x, if sorted ##
#Populate

#Example
    SkIRect unsorted = { 15, 5, 10, 25 };
    SkDebugf("unsorted.fLeft: %d unsorted.left(): %d\n", unsorted.fLeft, unsorted.left());
    SkIRect sorted = unsorted.makeSorted();
    SkDebugf("sorted.fLeft: %d sorted.left(): %d\n", sorted.fLeft, sorted.left());
#StdOut
unsorted.fLeft: 15 unsorted.left(): 15
sorted.fLeft: 10 sorted.left(): 10
##
##

#SeeAlso fLeft x() SkRect::left()

##

# ------------------------------------------------------------------------------

#Method int32_t top() const

#In Property
#Line # returns smaller bounds in y, if sorted ##
#Populate

#Example
    SkIRect unsorted = { 15, 25, 10, 5 };
    SkDebugf("unsorted.fTop: %d unsorted.top(): %d\n", unsorted.fTop, unsorted.top());
    SkIRect sorted = unsorted.makeSorted();
    SkDebugf("sorted.fTop: %d sorted.top(): %d\n", sorted.fTop, sorted.top());
#StdOut
unsorted.fTop: 25 unsorted.top(): 25
sorted.fTop: 5 sorted.top(): 5
##
##

#SeeAlso fTop y() SkRect::top()

##

# ------------------------------------------------------------------------------

#Method int32_t right() const

#In Property
#Line # returns larger bounds in x, if sorted ##
#Populate

#Example
    SkIRect unsorted = { 15, 25, 10, 5 };
    SkDebugf("unsorted.fRight: %d unsorted.right(): %d\n", unsorted.fRight, unsorted.right());
    SkIRect sorted = unsorted.makeSorted();
    SkDebugf("sorted.fRight: %d sorted.right(): %d\n", sorted.fRight, sorted.right());
#StdOut
unsorted.fRight: 10 unsorted.right(): 10
sorted.fRight: 15 sorted.right(): 15
##
##

#SeeAlso fRight SkRect::right()

##

# ------------------------------------------------------------------------------

#Method int32_t bottom() const

#In Property
#Line # returns larger bounds in y, if sorted ##
#Populate

#Example
    SkIRect unsorted = { 15, 25, 10, 5 };
    SkDebugf("unsorted.fBottom: %d unsorted.bottom(): %d\n", unsorted.fBottom, unsorted.bottom());
    SkIRect sorted = unsorted.makeSorted();
    SkDebugf("sorted.fBottom: %d sorted.bottom(): %d\n", sorted.fBottom, sorted.bottom());
#StdOut
unsorted.fBottom: 5 unsorted.bottom(): 5
sorted.fBottom: 25 sorted.bottom(): 25
##
##

#SeeAlso fBottom SkRect::bottom()

##

# ------------------------------------------------------------------------------

#Method int32_t x() const

#In Property
#Line # returns bounds left ##
#Populate

#Example
    SkIRect unsorted = { 15, 5, 10, 25 };
    SkDebugf("unsorted.fLeft: %d unsorted.x(): %d\n", unsorted.fLeft, unsorted.x());
    SkIRect sorted = unsorted.makeSorted();
    SkDebugf("sorted.fLeft: %d sorted.x(): %d\n", sorted.fLeft, sorted.x());
#StdOut
unsorted.fLeft: 15 unsorted.x(): 15
sorted.fLeft: 10 sorted.x(): 10
##
##

#SeeAlso fLeft left() y() SkRect::x()

##

# ------------------------------------------------------------------------------

#Method int32_t y() const

#In Property
#Line # returns bounds top ##
#Populate

#Example
    SkIRect unsorted = { 15, 25, 10, 5 };
    SkDebugf("unsorted.fTop: %d unsorted.y(): %d\n", unsorted.fTop, unsorted.y());
    SkIRect sorted = unsorted.makeSorted();
    SkDebugf("sorted.fTop: %d sorted.y(): %d\n", sorted.fTop, sorted.y());
#StdOut
unsorted.fTop: 25 unsorted.y(): 25
sorted.fTop: 5 sorted.y(): 5
##
##

#SeeAlso fTop top() x() SkRect::y()

##

# ------------------------------------------------------------------------------

#Method int32_t width() const

#In Property
#Line # returns span in x ##
#Populate

#Example
    SkIRect unsorted = { 15, 25, 10, 5 };
    SkDebugf("unsorted width: %d\n", unsorted.width());
    SkIRect large = { -2147483647, 1, 2147483644, 2 };
    SkDebugf("large width: %d\n", large.width());
#StdOut
unsorted width: -5
large width: -5
##
##

#SeeAlso height() width64() height64() SkRect::width()

##

# ------------------------------------------------------------------------------

#Method int64_t width64() const

#In Property
#Line # returns span in y as int64_t ##
#Populate

#Example
SkIRect large = { -2147483647, 1, 2147483644, 2 };
SkDebugf("width: %d width64: %lld\n", large.width(), large.width64());
#StdOut
width: -5 width64: 4294967291
##
##

#SeeAlso width() height() height64() SkRect::width()

##

# ------------------------------------------------------------------------------

#Method int32_t height() const

#In Property
#Line # returns span in y ##
#Populate

#Example
    SkIRect unsorted = { 15, 25, 10, 20 };
    SkDebugf("unsorted height: %d\n", unsorted.height());
    SkIRect large = { 1, -2147483647, 2, 2147483644 };
    SkDebugf("large height: %d\n", large.height());
#StdOut
unsorted height: -5
large height: -5
##
##

#SeeAlso width() SkRect::height()

##

# ------------------------------------------------------------------------------

#Method int64_t height64() const

#In Property
#Line # returns span in y as int64_t ##
#Populate

#Example
SkIRect large = { 1, -2147483647, 2, 2147483644 };
SkDebugf("height: %d height64: %lld\n", large.height(), large.height64());
#StdOut
height: -5 height64: 4294967291
##
##

#SeeAlso width() height() width64() SkRect::height()

##

# ------------------------------------------------------------------------------

#Method SkISize size() const

#In Property
#Line # returns ISize (width, height) ##
#Populate

#Example
    auto debugster = [](const char* prefix, const SkIRect& rect) -> void {
        SkISize size = rect.size();
        SkDebugf("%s ", prefix);
        SkDebugf("rect: %d, %d, %d, %d  ", rect.left(), rect.top(), rect.right(), rect.bottom());
        SkDebugf("size: %d, %d\n", size.width(), size.height());
    };
    SkIRect rect = {20, 30, 40, 50};
    debugster("original", rect);
    rect.offset(20, 20);
    debugster("  offset", rect);
    rect.outset(20, 20);
    debugster("  outset", rect);
#StdOut
original rect: 20, 30, 40, 50  size: 20, 20
  offset rect: 40, 50, 60, 70  size: 20, 20
  outset rect: 20, 30, 80, 90  size: 60, 60
##
##

#SeeAlso height() width() MakeSize

##

# ------------------------------------------------------------------------------

#Method bool isEmpty() const

#In Property
#Line # returns true if width or height are zero or negative or they exceed int32_t ##
#Populate

#Example
    SkIRect tests[] = {{20, 40, 10, 50}, {20, 40, 20, 50}};
    for (auto rect : tests) {
        SkDebugf("rect: {%d, %d, %d, %d} is" "%s empty\n", rect.left(), rect.top(), rect.right(),
                 rect.bottom(), rect.isEmpty() ? "" : " not");
        rect.sort();
        SkDebugf("sorted: {%d, %d, %d, %d} is" "%s empty\n", rect.left(), rect.top(), rect.right(),
                 rect.bottom(), rect.isEmpty() ? "" : " not");
    }
#StdOut
rect: {20, 40, 10, 50} is empty
sorted: {10, 40, 20, 50} is not empty
rect: {20, 40, 20, 50} is empty
sorted: {20, 40, 20, 50} is empty
##
##

#SeeAlso EmptyIRect MakeEmpty sort SkRect::isEmpty

##

# ------------------------------------------------------------------------------

#Method bool isEmpty64() const

#In Property
#Line # returns true if width or height are zero or negative ##
#Populate

#Example
SkIRect tests[] = {{20, 40, 10, 50}, {20, 40, 20, 50}};
for (auto rect : tests) {
    SkDebugf("rect: {%d, %d, %d, %d} is" "%s empty\n", rect.left(), rect.top(), rect.right(),
            rect.bottom(), rect.isEmpty64() ? "" : " not");
    rect.sort();
    SkDebugf("sorted: {%d, %d, %d, %d} is" "%s empty\n", rect.left(), rect.top(), rect.right(),
            rect.bottom(), rect.isEmpty64() ? "" : " not");
}
#StdOut
rect: {20, 40, 10, 50} is empty
sorted: {10, 40, 20, 50} is not empty
rect: {20, 40, 20, 50} is empty
sorted: {20, 40, 20, 50} is empty
##
##

#SeeAlso EmptyIRect MakeEmpty sort SkRect::isEmpty

##

#Subtopic Operators

# ------------------------------------------------------------------------------

#Method bool operator==(const SkIRect& a, const SkIRect& b)

#In Operators
#Line # returns true if members are equal ##
#Populate

#Example
    SkIRect test = {0, 0, 2, 2};
    SkIRect sorted = test.makeSorted();
    SkDebugf("test %c= sorted\n", test == sorted ? '=' : '!');
#StdOut
test == sorted
##
##

#SeeAlso operator!=(const SkIRect& a, const SkIRect& b)

##

# ------------------------------------------------------------------------------

#Method bool operator!=(const SkIRect& a, const SkIRect& b)

#In Operators
#Line # returns true if members are unequal ##
#Populate

#Example
    SkIRect test = {2, 2, 0, 0};
    SkIRect sorted = test.makeSorted();
    SkDebugf("test %c= sorted\n", test != sorted ? '!' : '=');
#StdOut
test != sorted
##
##

#SeeAlso operator==(const SkIRect& a, const SkIRect& b)

##

#Subtopic Operators ##

# ------------------------------------------------------------------------------

#Subtopic Set
#Line # replaces all values ##
##

#Method void setEmpty()

#In Set
#Line # sets to (0, 0, 0, 0) ##
#Populate

#Example
    SkIRect rect = {3, 4, 1, 2};
    for (int i = 0; i < 2; ++i) {
    SkDebugf("rect: {%d, %d, %d, %d} is %s" "empty\n", rect.fLeft, rect.fTop,
             rect.fRight, rect.fBottom, rect.isEmpty() ? "" : "not ");
    rect.setEmpty();
    }
#StdOut
rect: {3, 4, 1, 2} is empty
rect: {0, 0, 0, 0} is empty
##
##

#SeeAlso MakeEmpty SkRect::setEmpty

##

# ------------------------------------------------------------------------------

#Method void set(int32_t left, int32_t top, int32_t right, int32_t bottom)

#In Set
#Line # sets to (left, top, right, bottom) ##
#Populate

#Example
    SkIRect rect1 = {3, 4, 1, 2};
    SkDebugf("rect1: {%d, %d, %d, %d}\n", rect1.fLeft, rect1.fTop, rect1.fRight, rect1.fBottom);
    SkIRect rect2;
    rect2.set(3, 4, 1, 2);
    SkDebugf("rect2: {%d, %d, %d, %d}\n", rect2.fLeft, rect2.fTop, rect2.fRight, rect2.fBottom);
#StdOut
rect1: {3, 4, 1, 2}
rect2: {3, 4, 1, 2}
##
##

#SeeAlso setLTRB setXYWH SkRect::set

##

# ------------------------------------------------------------------------------

#Method void setLTRB(int32_t left, int32_t top, int32_t right, int32_t bottom)

#In Set
#Line # sets to SkScalar input (left, top, right, bottom) ##
#Populate

#Example
    SkIRect rect1 = {3, 4, 1, 2};
    SkDebugf("rect1: {%d, %d, %d, %d}\n", rect1.fLeft, rect1.fTop, rect1.fRight, rect1.fBottom);
    SkIRect rect2;
    rect2.setLTRB(3, 4, 1, 2);
    SkDebugf("rect2: {%d, %d, %d, %d}\n", rect2.fLeft, rect2.fTop, rect2.fRight, rect2.fBottom);
#StdOut
rect1: {3, 4, 1, 2}
rect2: {3, 4, 1, 2}
##
##

#SeeAlso set setXYWH SkRect::setLTRB

##

# ------------------------------------------------------------------------------

#Method void setXYWH(int32_t x, int32_t y, int32_t width, int32_t height)

#In Set
#Line # sets to (x, y, width, height) ##
Sets IRect to: #Formula # (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 ##

#Example
    SkIRect rect;
    rect.setXYWH(5, 35, -15, 25);
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect.sort();
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
#StdOut
rect: 5, 35, -10, 60  isEmpty: true
rect: -10, 35, 5, 60  isEmpty: false
##
##

#SeeAlso MakeXYWH setLTRB set SkRect::setXYWH

##

#Subtopic Inset_Outset_Offset
#Line # moves sides ##

# ------------------------------------------------------------------------------

#Method SkIRect makeOffset(int32_t dx, int32_t dy) const

#In Inset_Outset_Offset
#Line # constructs from translated sides ##
#Populate

#Example
    SkIRect rect = { 10, 50, 20, 60 };
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect = rect.makeOffset(15, 32);
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
#StdOut
rect: 10, 50, 20, 60  isEmpty: false
rect: 25, 82, 35, 92  isEmpty: false
##
##

#SeeAlso offset() makeInset makeOutset SkRect::makeOffset

##

# ------------------------------------------------------------------------------

#Method SkIRect makeInset(int32_t dx, int32_t dy) const

#In Inset_Outset_Offset
#Line # constructs from sides moved symmetrically about the center ##
#Populate

#Example
    SkIRect rect = { 10, 50, 20, 60 };
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect = rect.makeInset(15, 32);
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
#StdOut
rect: 10, 50, 20, 60  isEmpty: false
rect: 25, 82, 5, 28  isEmpty: true
##
##

#SeeAlso inset() makeOffset makeOutset SkRect::makeInset

##

# ------------------------------------------------------------------------------

#Method SkIRect makeOutset(int32_t dx, int32_t dy) const

#In Inset_Outset_Offset
#Line # constructs from sides moved symmetrically about the center ##
#Populate

#Example
    SkIRect rect = { 10, 50, 20, 60 };
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect = rect.makeOutset(15, 32);
    SkDebugf("rect: %d, %d, %d, %d  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
#StdOut
rect: 10, 50, 20, 60  isEmpty: false
rect: -5, 18, 35, 92  isEmpty: false
##
##

#SeeAlso outset() makeOffset makeInset SkRect::makeOutset

##

# ------------------------------------------------------------------------------

#Method void offset(int32_t dx, int32_t dy)

#In Inset_Outset_Offset
#Line # translates sides without changing width and height ##
#Populate

#Example
    SkIRect rect = { 10, 14, 50, 73 };
    rect.offset(5, 13);
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 15, 27, 55, 86
##
##

#SeeAlso offsetTo makeOffset SkRect::offset

##

# ------------------------------------------------------------------------------

#Method void offset(const SkIPoint& delta)

#In Inset_Outset_Offset
#Populate

#Example
    SkIRect rect = { 10, 14, 50, 73 };
    rect.offset({5, 13});
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 15, 27, 55, 86
##
##

#SeeAlso offsetTo makeOffset SkRect::offset

##

# ------------------------------------------------------------------------------

#Method void offsetTo(int32_t newX, int32_t newY)

#In Inset_Outset_Offset
#Line # translates to (x, y) without changing width and height ##
#Populate

#Example
    SkIRect rect = { 10, 14, 50, 73 };
    rect.offsetTo(15, 27);
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 15, 27, 55, 86
##
##

#SeeAlso offset makeOffset setXYWH SkRect::offsetTo

##

# ------------------------------------------------------------------------------

#Method void inset(int32_t dx, int32_t dy)

#In Inset_Outset_Offset
#Line # moves the sides symmetrically about the center ##
#Populate

#Example
    SkIRect rect = { 10, 14, 50, 73 };
    rect.inset(5, 13);
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 15, 27, 45, 60
##
##

#SeeAlso outset makeInset SkRect::inset

##

# ------------------------------------------------------------------------------

#Method void outset(int32_t dx, int32_t dy)

#In Inset_Outset_Offset
#Line # moves the sides symmetrically about the center ##
#Populate

#Example
    SkIRect rect = { 10, 14, 50, 73 };
    rect.outset(5, 13);
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 5, 1, 55, 86
##
##

#SeeAlso inset makeOutset SkRect::outset

##

#Subtopic Inset_Outset_Offset ##

#Subtopic Intersection
#Line # sets to shared bounds ##

IRects intersect when they enclose a common area. To intersect, each of the pair
must describe area; fLeft is less than fRight, and fTop is less than fBottom;
SkIRect::isEmpty() returns false. The intersection of IRect pair can be described by:
#Formula # (max(a.fLeft, b.fLeft), max(a.fTop, b.fTop),
            min(a.fRight, b.fRight), min(a.fBottom, b.fBottom)) ##.

The intersection is only meaningful if the resulting IRect is not empty and
describes an area: fLeft is less than fRight, and fTop is less than fBottom.

# ------------------------------------------------------------------------------

#Method void adjust(int32_t dL, int32_t dT, int32_t dR, int32_t dB)

#In Inset_Outset_Offset
#Line # moves the sides independently relative to their original locations ##
#Populate

#Example
    SkIRect rect = { 8, 11, 19, 22 };
    rect.adjust(2, -1, 1, -2);
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 10, 10, 20, 20
##
##

#SeeAlso inset outset

##

# ------------------------------------------------------------------------------

#Method bool contains(int32_t x, int32_t y) const

#In Intersection
#Line # returns true if IPoint (x, y) is equal or inside ##
Returns true if: #Formula # fLeft <= x < fRight && fTop <= y < fBottom ##.
Returns false if IRect is empty.

Considers input to describe constructed IRect: #Formula # (x, y, x + 1, y + 1) ## and 
returns true if constructed area is completely enclosed by IRect area.

#Param x  test IPoint x-coordinate ##
#Param y  test IPoint y-coordinate ##

#Return true if (x, y) is inside IRect ##

#Example
    SkIRect rect = { 30, 50, 40, 60 };
    SkIPoint pts[] = { { 30, 50}, { 40, 50}, { 30, 60} };
    for (auto pt : pts) {
        SkDebugf("rect: (%d, %d, %d, %d) %s (%d, %d)\n",
                 rect.left(), rect.top(), rect.right(), rect.bottom(),
                 rect.contains(pt.x(), pt.y()) ? "contains" : "does not contain", pt.x(), pt.y());
    }
#StdOut
rect: (30, 50, 40, 60) contains (30, 50)
rect: (30, 50, 40, 60) does not contain (40, 50)
rect: (30, 50, 40, 60) does not contain (30, 60)
##
##

#SeeAlso containsNoEmptyCheck SkRect::contains

##

# ------------------------------------------------------------------------------

#Method bool contains(int32_t left, int32_t top, int32_t right, int32_t bottom) const

#In Intersection
#Populate

#Example
    SkIRect rect = { 30, 50, 40, 60 };
    SkIRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
    for (auto contained : tests) {
        bool success = rect.contains(
                       contained.left(), contained.top(), contained.right(), contained.bottom());
        SkDebugf("rect: (%d, %d, %d, %d) %s (%d, %d, %d, %d)\n",
                 rect.left(), rect.top(), rect.right(), rect.bottom(),
                 success ? "contains" : "does not contain",
                 contained.left(), contained.top(), contained.right(), contained.bottom());
    }
#StdOut
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
##
##

#SeeAlso containsNoEmptyCheck SkRect::contains

##

# ------------------------------------------------------------------------------

#Method bool contains(const SkIRect& r) const

#In Intersection
#Populate

#Example
    SkIRect rect = { 30, 50, 40, 60 };
    SkIRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
    for (auto contained : tests) {
        SkDebugf("rect: (%d, %d, %d, %d) %s (%d, %d, %d, %d)\n",
                 rect.left(), rect.top(), rect.right(), rect.bottom(),
                 rect.contains(contained) ? "contains" : "does not contain",
                 contained.left(), contained.top(), contained.right(), contained.bottom());
    }
#StdOut
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
##
##

#SeeAlso containsNoEmptyCheck SkRect::contains

##

# ------------------------------------------------------------------------------

#Method bool contains(const SkRect& r) const

#In Intersection
#Populate

#Example
    SkIRect rect = { 30, 50, 40, 60 };
    SkRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
    for (auto contained : tests) {
        SkDebugf("rect: (%d, %d, %d, %d) %s (%g, %g, %g, %g)\n",
                 rect.left(), rect.top(), rect.right(), rect.bottom(),
                 rect.contains(contained) ? "contains" : "does not contain",
                 contained.left(), contained.top(), contained.right(), contained.bottom());
    }
#StdOut
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
##
##

#SeeAlso containsNoEmptyCheck SkRect::contains

##

# ------------------------------------------------------------------------------

#Method bool containsNoEmptyCheck(int32_t left, int32_t top,
                              int32_t right, int32_t bottom) const
#In Intersection
#Line # returns true if contains unsorted IRect ##
#Populate

#Example
    SkIRect rect = { 30, 50, 40, 60 };
    SkIRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
    for (auto contained : tests) {
        bool success = rect.containsNoEmptyCheck(
                 contained.left(), contained.top(), contained.right(), contained.bottom());
        SkDebugf("rect: (%d, %d, %d, %d) %s (%d, %d, %d, %d)\n",
                 rect.left(), rect.top(), rect.right(), rect.bottom(),
                 success ? "contains" : "does not contain",
                 contained.left(), contained.top(), contained.right(), contained.bottom());
    }
#StdOut
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
##
##

#SeeAlso contains SkRect::contains

##

# ------------------------------------------------------------------------------

#Method bool containsNoEmptyCheck(const SkIRect& r) const

#In Intersection
#Populate

#Example
    SkIRect rect = { 30, 50, 40, 60 };
    SkIRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
    for (auto contained : tests) {
        SkDebugf("rect: (%d, %d, %d, %d) %s (%d, %d, %d, %d)\n",
                 rect.left(), rect.top(), rect.right(), rect.bottom(),
                 rect.containsNoEmptyCheck(contained) ? "contains" : "does not contain",
                 contained.left(), contained.top(), contained.right(), contained.bottom());
    }
#StdOut
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
##
##

#SeeAlso contains SkRect::contains

##

# ------------------------------------------------------------------------------

#Method bool intersect(const SkIRect& r)

#In Intersection
#Line # sets to shared area; returns true if not empty ##
#Populate

#Example
#Description
Two SkDebugf calls are required. If the calls are combined, their arguments
may not be evaluated in left to right order: the printed intersection may
be before or after the call to intersect.
##
    SkIRect leftRect =  { 10, 40, 50, 80 };
    SkIRect rightRect = { 30, 60, 70, 90 };
    SkDebugf("%s intersection: ", leftRect.intersect(rightRect) ? "" : "no ");
    SkDebugf("%d, %d, %d, %d\n", leftRect.left(), leftRect.top(),
                                 leftRect.right(), leftRect.bottom());
#StdOut
 intersection: 30, 60, 50, 80
##
##

#SeeAlso Intersects intersectNoEmptyCheck join SkRect::intersect

##

# ------------------------------------------------------------------------------

#Method bool intersect(const SkIRect& a, const SkIRect& b)

#In Intersection
#Populate

#Example
    SkIRect result;
    bool intersected = result.intersect({ 10, 40, 50, 80 }, { 30, 60, 70, 90 });
    SkDebugf("%s intersection: %d, %d, %d, %d\n", intersected ? "" : "no ",
             result.left(), result.top(), result.right(), result.bottom());
#StdOut
 intersection: 30, 60, 50, 80
##
##

#SeeAlso Intersects intersectNoEmptyCheck join SkRect::intersect

##

# ------------------------------------------------------------------------------

#Method bool intersectNoEmptyCheck(const SkIRect& a, const SkIRect& b)

#In Intersection
#Line # sets to shared area; returns true if not empty skips empty check ##
#Populate

#Example
    SkIRect result;
    if (result.intersectNoEmptyCheck({ 10, 40, 50, 80 }, { 30, 60, 70, 90 })) {
        SkDebugf("intersection: %d, %d, %d, %d\n",
                 result.left(), result.top(), result.right(), result.bottom());
    }
#StdOut
 intersection: 30, 60, 50, 80
##
##

#SeeAlso Intersects intersect join SkRect::intersect

##

# ------------------------------------------------------------------------------

#Method bool intersect(int32_t left, int32_t top, int32_t right, int32_t bottom)

#In Intersection
#Populate

#Example
#Description
Two SkDebugf calls are required. If the calls are combined, their arguments
may not be evaluated in left to right order: the printed intersection may
be before or after the call to intersect.
##
    SkIRect leftRect =  { 10, 40, 50, 80 };
    SkDebugf("%s intersection: ", leftRect.intersect(30, 60, 70, 90) ? "" : "no ");
    SkDebugf("%d, %d, %d, %d\n", leftRect.left(), leftRect.top(),
                                 leftRect.right(), leftRect.bottom());
#StdOut
 intersection: 30, 60, 50, 80
##
##

#SeeAlso intersectNoEmptyCheck Intersects join SkRect::intersect

##

# ------------------------------------------------------------------------------

#Method static bool Intersects(const SkIRect& a, const SkIRect& b)

#In Intersection
#Line # returns true if areas overlap ##
#Populate

#Example
    SkDebugf("%s intersection", SkIRect::Intersects({10, 40, 50, 80}, {30, 60, 70, 90}) ? "" : "no ");
#StdOut
 intersection
##
##

#SeeAlso IntersectsNoEmptyCheck intersect SkRect::intersect

##

# ------------------------------------------------------------------------------

#Method static bool IntersectsNoEmptyCheck(const SkIRect& a, const SkIRect& b)

#In Intersection
#Line # returns true if areas overlap skips empty check ##
#Populate

#Example
    SkDebugf("%s intersection", SkIRect::IntersectsNoEmptyCheck(
            {10, 40, 50, 80}, {30, 60, 70, 90}) ? "" : "no ");
#StdOut
 intersection
##
##

#SeeAlso Intersects intersect SkRect::intersect

##

#Subtopic Intersection ##

# ------------------------------------------------------------------------------

#Subtopic Join
#Line # sets to union of bounds ##
##

#Method void join(int32_t left, int32_t top, int32_t right, int32_t bottom)

#In Join
#Line # sets to union of bounds ##
#Populate

#Example
    SkIRect rect = { 10, 20, 15, 25};
    rect.join(50, 60, 55, 65);
    SkDebugf("join: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
 join: 10, 20, 55, 65
##
##

#SeeAlso set SkRect::join

##

# ------------------------------------------------------------------------------

#Method void join(const SkIRect& r)

#In Join
#Populate

#Example
    SkIRect rect = { 10, 20, 15, 25};
    rect.join({50, 60, 55, 65});
    SkDebugf("join: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
 join: 10, 20, 55, 65
##
##

#SeeAlso set SkRect::join

##

# ------------------------------------------------------------------------------

#Subtopic Sorting
#Line # orders sides ##
##

#Method void sort()

#In Sorting
#Line # orders sides from smaller to larger ##
#Populate

#Example
    SkIRect rect = { 30, 50, 20, 10 };
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
    rect.sort();
    SkDebugf("sorted: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 30, 50, 20, 10
sorted: 20, 10, 30, 50
##
##

#SeeAlso makeSorted SkRect::sort

##

# ------------------------------------------------------------------------------

#Method SkIRect makeSorted() const

#In Sorting
#In Constructors
#Line # constructs IRect, ordering sides from smaller to larger ##
#Populate

#Example
    SkIRect rect = { 30, 50, 20, 10 };
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
    SkIRect sort = rect.makeSorted();
    SkDebugf("sorted: %d, %d, %d, %d\n", sort.fLeft, sort.fTop, sort.fRight, sort.fBottom);
#StdOut
rect: 30, 50, 20, 10
sorted: 20, 10, 30, 50
##
##

#SeeAlso sort SkRect::makeSorted

##

# ------------------------------------------------------------------------------

#Method static const SkIRect& EmptyIRect()

#In Constructors
#Line # returns immutable bounds of (0, 0, 0, 0) ##
#Populate

#Example
    const SkIRect& rect = SkIRect::EmptyIRect();
    SkDebugf("rect: %d, %d, %d, %d\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
#StdOut
rect: 0, 0, 0, 0
##
##

#SeeAlso MakeEmpty

##

#Struct SkIRect ##

#Topic IRect ##