332 lines
11 KiB
Mathematica
332 lines
11 KiB
Mathematica
|
/**
|
||
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the BSD-style license found in the
|
||
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
||
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#import "RCTBorderDrawing.h"
|
||
|
|
|
||
|
|
static const CGFloat RCTViewBorderThreshold = 0.001;
|
||
|
|
|
||
|
|
BOOL RCTBorderInsetsAreEqual(UIEdgeInsets borderInsets)
|
||
|
|
{
|
||
|
|
return
|
||
|
|
ABS(borderInsets.left - borderInsets.right) < RCTViewBorderThreshold &&
|
||
|
|
ABS(borderInsets.left - borderInsets.bottom) < RCTViewBorderThreshold &&
|
||
|
|
ABS(borderInsets.left - borderInsets.top) < RCTViewBorderThreshold;
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOL RCTCornerRadiiAreEqual(RCTCornerRadii cornerRadii)
|
||
|
|
{
|
||
|
|
return
|
||
|
|
ABS(cornerRadii.topLeft - cornerRadii.topRight) < RCTViewBorderThreshold &&
|
||
|
|
ABS(cornerRadii.topLeft - cornerRadii.bottomLeft) < RCTViewBorderThreshold &&
|
||
|
|
ABS(cornerRadii.topLeft - cornerRadii.bottomRight) < RCTViewBorderThreshold;
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOL RCTBorderColorsAreEqual(RCTBorderColors borderColors)
|
||
|
|
{
|
||
|
|
return
|
||
|
|
CGColorEqualToColor(borderColors.left, borderColors.right) &&
|
||
|
|
CGColorEqualToColor(borderColors.left, borderColors.top) &&
|
||
|
|
CGColorEqualToColor(borderColors.left, borderColors.bottom);
|
||
|
|
}
|
||
|
|
|
||
|
|
RCTCornerInsets RCTGetCornerInsets(RCTCornerRadii cornerRadii,
|
||
|
|
UIEdgeInsets edgeInsets)
|
||
|
|
{
|
||
|
|
return (RCTCornerInsets) {
|
||
|
|
{
|
||
|
|
MAX(0, cornerRadii.topLeft - edgeInsets.left),
|
||
|
|
MAX(0, cornerRadii.topLeft - edgeInsets.top),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
MAX(0, cornerRadii.topRight - edgeInsets.right),
|
||
|
|
MAX(0, cornerRadii.topRight - edgeInsets.top),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
MAX(0, cornerRadii.bottomLeft - edgeInsets.left),
|
||
|
|
MAX(0, cornerRadii.bottomLeft - edgeInsets.bottom),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
MAX(0, cornerRadii.bottomRight - edgeInsets.right),
|
||
|
|
MAX(0, cornerRadii.bottomRight - edgeInsets.bottom),
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
static void RCTPathAddEllipticArc(CGMutablePathRef path,
|
||
|
|
const CGAffineTransform *m,
|
||
|
|
CGPoint origin,
|
||
|
|
CGSize size,
|
||
|
|
CGFloat startAngle,
|
||
|
|
CGFloat endAngle,
|
||
|
|
BOOL clockwise)
|
||
|
|
{
|
||
|
|
CGFloat xScale = 1, yScale = 1, radius = 0;
|
||
|
|
if (size.width != 0) {
|
||
|
|
xScale = 1;
|
||
|
|
yScale = size.height / size.width;
|
||
|
|
radius = size.width;
|
||
|
|
} else if (size.height != 0) {
|
||
|
|
xScale = size.width / size.height;
|
||
|
|
yScale = 1;
|
||
|
|
radius = size.height;
|
||
|
|
}
|
||
|
|
|
||
|
|
CGAffineTransform t = CGAffineTransformMakeTranslation(origin.x, origin.y);
|
||
|
|
t = CGAffineTransformScale(t, xScale, yScale);
|
||
|
|
if (m != NULL) {
|
||
|
|
t = CGAffineTransformConcat(t, *m);
|
||
|
|
}
|
||
|
|
|
||
|
|
CGPathAddArc(path, &t, 0, 0, radius, startAngle, endAngle, clockwise);
|
||
|
|
}
|
||
|
|
|
||
|
|
CGPathRef RCTPathCreateWithRoundedRect(CGRect bounds,
|
||
|
|
RCTCornerInsets cornerInsets,
|
||
|
|
const CGAffineTransform *transform)
|
||
|
|
{
|
||
|
|
const CGFloat minX = CGRectGetMinX(bounds);
|
||
|
|
const CGFloat minY = CGRectGetMinY(bounds);
|
||
|
|
const CGFloat maxX = CGRectGetMaxX(bounds);
|
||
|
|
const CGFloat maxY = CGRectGetMaxY(bounds);
|
||
|
|
|
||
|
|
const CGSize topLeft = cornerInsets.topLeft;
|
||
|
|
const CGSize topRight = cornerInsets.topRight;
|
||
|
|
const CGSize bottomLeft = cornerInsets.bottomLeft;
|
||
|
|
const CGSize bottomRight = cornerInsets.bottomRight;
|
||
|
|
|
||
|
|
CGMutablePathRef path = CGPathCreateMutable();
|
||
|
|
RCTPathAddEllipticArc(path, transform, (CGPoint){
|
||
|
|
minX + topLeft.width, minY + topLeft.height
|
||
|
|
}, topLeft, M_PI, 3 * M_PI_2, NO);
|
||
|
|
RCTPathAddEllipticArc(path, transform, (CGPoint){
|
||
|
|
maxX - topRight.width, minY + topRight.height
|
||
|
|
}, topRight, 3 * M_PI_2, 0, NO);
|
||
|
|
RCTPathAddEllipticArc(path, transform, (CGPoint){
|
||
|
|
maxX - bottomRight.width, maxY - bottomRight.height
|
||
|
|
}, bottomRight, 0, M_PI_2, NO);
|
||
|
|
RCTPathAddEllipticArc(path, transform, (CGPoint){
|
||
|
|
minX + bottomLeft.width, maxY - bottomLeft.height
|
||
|
|
}, bottomLeft, M_PI_2, M_PI, NO);
|
||
|
|
CGPathCloseSubpath(path);
|
||
|
|
return path;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void RCTEllipseGetIntersectionsWithLine(CGRect ellipseBounds,
|
||
|
|
CGPoint lineStart,
|
||
|
|
CGPoint lineEnd,
|
||
|
|
CGPoint intersections[2])
|
||
|
|
{
|
||
|
|
const CGPoint ellipseCenter = {
|
||
|
|
CGRectGetMidX(ellipseBounds),
|
||
|
|
CGRectGetMidY(ellipseBounds)
|
||
|
|
};
|
||
|
|
|
||
|
|
lineStart.x -= ellipseCenter.x;
|
||
|
|
lineStart.y -= ellipseCenter.y;
|
||
|
|
lineEnd.x -= ellipseCenter.x;
|
||
|
|
lineEnd.y -= ellipseCenter.y;
|
||
|
|
|
||
|
|
const CGFloat m = (lineEnd.y - lineStart.y) / (lineEnd.x - lineStart.x);
|
||
|
|
const CGFloat a = ellipseBounds.size.width / 2;
|
||
|
|
const CGFloat b = ellipseBounds.size.height / 2;
|
||
|
|
const CGFloat c = lineStart.y - m * lineStart.x;
|
||
|
|
const CGFloat A = (b * b + a * a * m * m);
|
||
|
|
const CGFloat B = 2 * a * a * c * m;
|
||
|
|
const CGFloat D = sqrt((a * a * (b * b - c * c)) / A + pow(B / (2 * A), 2));
|
||
|
|
|
||
|
|
const CGFloat x_ = -B / (2 * A);
|
||
|
|
const CGFloat x1 = x_ + D;
|
||
|
|
const CGFloat x2 = x_ - D;
|
||
|
|
const CGFloat y1 = m * x1 + c;
|
||
|
|
const CGFloat y2 = m * x2 + c;
|
||
|
|
|
||
|
|
intersections[0] = (CGPoint){x1 + ellipseCenter.x, y1 + ellipseCenter.y};
|
||
|
|
intersections[1] = (CGPoint){x2 + ellipseCenter.x, y2 + ellipseCenter.y};
|
||
|
|
}
|
||
|
|
|
||
|
|
UIImage *RCTGetBorderImage(RCTCornerRadii cornerRadii,
|
||
|
|
UIEdgeInsets borderInsets,
|
||
|
|
RCTBorderColors borderColors,
|
||
|
|
CGColorRef backgroundColor,
|
||
|
|
BOOL drawToEdge)
|
||
|
|
{
|
||
|
|
const BOOL hasCornerRadii =
|
||
|
|
cornerRadii.topLeft > RCTViewBorderThreshold ||
|
||
|
|
cornerRadii.topRight > RCTViewBorderThreshold ||
|
||
|
|
cornerRadii.bottomLeft > RCTViewBorderThreshold ||
|
||
|
|
cornerRadii.bottomRight > RCTViewBorderThreshold;
|
||
|
|
|
||
|
|
const RCTCornerInsets cornerInsets = RCTGetCornerInsets(cornerRadii, borderInsets);
|
||
|
|
|
||
|
|
const UIEdgeInsets edgeInsets = (UIEdgeInsets){
|
||
|
|
borderInsets.top + MAX(cornerInsets.topLeft.height, cornerInsets.topRight.height),
|
||
|
|
borderInsets.left + MAX(cornerInsets.topLeft.width, cornerInsets.bottomLeft.width),
|
||
|
|
borderInsets.bottom + MAX(cornerInsets.bottomLeft.height, cornerInsets.bottomRight.height),
|
||
|
|
borderInsets.right + MAX(cornerInsets.bottomRight.width, cornerInsets.topRight.width)
|
||
|
|
};
|
||
|
|
|
||
|
|
const CGSize size = (CGSize){
|
||
|
|
edgeInsets.left + 1 + edgeInsets.right,
|
||
|
|
edgeInsets.top + 1 + edgeInsets.bottom
|
||
|
|
};
|
||
|
|
|
||
|
|
const CGFloat alpha = CGColorGetAlpha(backgroundColor);
|
||
|
|
const BOOL opaque = (drawToEdge || !hasCornerRadii) && alpha == 1.0;
|
||
|
|
UIGraphicsBeginImageContextWithOptions(size, opaque, 0.0);
|
||
|
|
|
||
|
|
CGContextRef ctx = UIGraphicsGetCurrentContext();
|
||
|
|
const CGRect rect = {.size = size};
|
||
|
|
|
||
|
|
CGPathRef path;
|
||
|
|
if (drawToEdge) {
|
||
|
|
path = CGPathCreateWithRect(rect, NULL);
|
||
|
|
} else {
|
||
|
|
path = RCTPathCreateWithRoundedRect(rect, RCTGetCornerInsets(cornerRadii, UIEdgeInsetsZero), NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (backgroundColor) {
|
||
|
|
CGContextSetFillColorWithColor(ctx, backgroundColor);
|
||
|
|
CGContextAddPath(ctx, path);
|
||
|
|
CGContextFillPath(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
CGContextAddPath(ctx, path);
|
||
|
|
CGPathRelease(path);
|
||
|
|
|
||
|
|
CGPathRef insetPath = RCTPathCreateWithRoundedRect(UIEdgeInsetsInsetRect(rect, borderInsets), cornerInsets, NULL);
|
||
|
|
|
||
|
|
CGContextAddPath(ctx, insetPath);
|
||
|
|
CGContextEOClip(ctx);
|
||
|
|
|
||
|
|
BOOL hasEqualColors = RCTBorderColorsAreEqual(borderColors);
|
||
|
|
if ((drawToEdge || !hasCornerRadii) && hasEqualColors) {
|
||
|
|
|
||
|
|
CGContextSetFillColorWithColor(ctx, borderColors.left);
|
||
|
|
CGContextAddRect(ctx, rect);
|
||
|
|
CGContextAddPath(ctx, insetPath);
|
||
|
|
CGContextEOFillPath(ctx);
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
CGPoint topLeft = (CGPoint){borderInsets.left, borderInsets.top};
|
||
|
|
if (cornerInsets.topLeft.width > 0 && cornerInsets.topLeft.height > 0) {
|
||
|
|
CGPoint points[2];
|
||
|
|
RCTEllipseGetIntersectionsWithLine((CGRect){
|
||
|
|
topLeft, {2 * cornerInsets.topLeft.width, 2 * cornerInsets.topLeft.height}
|
||
|
|
}, CGPointZero, topLeft, points);
|
||
|
|
if (!isnan(points[1].x) && !isnan(points[1].y)) {
|
||
|
|
topLeft = points[1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGPoint bottomLeft = (CGPoint){borderInsets.left, size.height - borderInsets.bottom};
|
||
|
|
if (cornerInsets.bottomLeft.width > 0 && cornerInsets.bottomLeft.height > 0) {
|
||
|
|
CGPoint points[2];
|
||
|
|
RCTEllipseGetIntersectionsWithLine((CGRect){
|
||
|
|
{bottomLeft.x, bottomLeft.y - 2 * cornerInsets.bottomLeft.height},
|
||
|
|
{2 * cornerInsets.bottomLeft.width, 2 * cornerInsets.bottomLeft.height}
|
||
|
|
}, (CGPoint){0, size.height}, bottomLeft, points);
|
||
|
|
if (!isnan(points[1].x) && !isnan(points[1].y)) {
|
||
|
|
bottomLeft = points[1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGPoint topRight = (CGPoint){size.width - borderInsets.right, borderInsets.top};
|
||
|
|
if (cornerInsets.topRight.width > 0 && cornerInsets.topRight.height > 0) {
|
||
|
|
CGPoint points[2];
|
||
|
|
RCTEllipseGetIntersectionsWithLine((CGRect){
|
||
|
|
{topRight.x - 2 * cornerInsets.topRight.width, topRight.y},
|
||
|
|
{2 * cornerInsets.topRight.width, 2 * cornerInsets.topRight.height}
|
||
|
|
}, (CGPoint){size.width, 0}, topRight, points);
|
||
|
|
if (!isnan(points[0].x) && !isnan(points[0].y)) {
|
||
|
|
topRight = points[0];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGPoint bottomRight = (CGPoint){size.width - borderInsets.right, size.height - borderInsets.bottom};
|
||
|
|
if (cornerInsets.bottomRight.width > 0 && cornerInsets.bottomRight.height > 0) {
|
||
|
|
CGPoint points[2];
|
||
|
|
RCTEllipseGetIntersectionsWithLine((CGRect){
|
||
|
|
{bottomRight.x - 2 * cornerInsets.bottomRight.width, bottomRight.y - 2 * cornerInsets.bottomRight.height},
|
||
|
|
{2 * cornerInsets.bottomRight.width, 2 * cornerInsets.bottomRight.height}
|
||
|
|
}, (CGPoint){size.width, size.height}, bottomRight, points);
|
||
|
|
if (!isnan(points[0].x) && !isnan(points[0].y)) {
|
||
|
|
bottomRight = points[0];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// RIGHT
|
||
|
|
if (borderInsets.right > 0) {
|
||
|
|
|
||
|
|
const CGPoint points[] = {
|
||
|
|
(CGPoint){size.width, 0},
|
||
|
|
topRight,
|
||
|
|
bottomRight,
|
||
|
|
(CGPoint){size.width, size.height},
|
||
|
|
};
|
||
|
|
|
||
|
|
CGContextSetFillColorWithColor(ctx, borderColors.right);
|
||
|
|
CGContextAddLines(ctx, points, sizeof(points)/sizeof(*points));
|
||
|
|
CGContextFillPath(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
// BOTTOM
|
||
|
|
if (borderInsets.bottom > 0) {
|
||
|
|
|
||
|
|
const CGPoint points[] = {
|
||
|
|
(CGPoint){0, size.height},
|
||
|
|
bottomLeft,
|
||
|
|
bottomRight,
|
||
|
|
(CGPoint){size.width, size.height},
|
||
|
|
};
|
||
|
|
|
||
|
|
CGContextSetFillColorWithColor(ctx, borderColors.bottom);
|
||
|
|
CGContextAddLines(ctx, points, sizeof(points)/sizeof(*points));
|
||
|
|
CGContextFillPath(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
// LEFT
|
||
|
|
if (borderInsets.left > 0) {
|
||
|
|
|
||
|
|
const CGPoint points[] = {
|
||
|
|
CGPointZero,
|
||
|
|
topLeft,
|
||
|
|
bottomLeft,
|
||
|
|
(CGPoint){0, size.height},
|
||
|
|
};
|
||
|
|
|
||
|
|
CGContextSetFillColorWithColor(ctx, borderColors.left);
|
||
|
|
CGContextAddLines(ctx, points, sizeof(points)/sizeof(*points));
|
||
|
|
CGContextFillPath(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
// TOP
|
||
|
|
if (borderInsets.top > 0) {
|
||
|
|
|
||
|
|
const CGPoint points[] = {
|
||
|
|
CGPointZero,
|
||
|
|
topLeft,
|
||
|
|
topRight,
|
||
|
|
(CGPoint){size.width, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
CGContextSetFillColorWithColor(ctx, borderColors.top);
|
||
|
|
CGContextAddLines(ctx, points, sizeof(points)/sizeof(*points));
|
||
|
|
CGContextFillPath(ctx);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGPathRelease(insetPath);
|
||
|
|
|
||
|
|
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
|
||
|
|
UIGraphicsEndImageContext();
|
||
|
|
|
||
|
|
return [image resizableImageWithCapInsets:edgeInsets];
|
||
|
|
}
|