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fix(ios): Use anti-aliasing for accurate borders #10619

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Merged
merged 2 commits into from
Oct 31, 2024
Merged

fix(ios): Use anti-aliasing for accurate borders #10619

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b3954f3
fix(ios): Use anti-aliasing for accurate borders
CatchABus Sep 6, 2024
86858ed
Merge branch 'main' into ios-border-rasterize-fix
NathanWalker Oct 31, 2024
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23 changes: 12 additions & 11 deletions packages/core/ui/styling/background.ios.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -725,20 +725,15 @@ function calculateNonUniformBorderCappedRadii(bounds: CGRect, background: Backgr

function drawNonUniformBorders(nativeView: NativeScriptUIView, background: BackgroundDefinition): void {
const layer: CALayer = nativeView.layer;
// There are some cases like drawing when Core Animation API has trouble with fractional coordinates,
// so get the difference between the fractional and integral origin points and use it as offset
const { x: frameX, y: frameY } = layer.frame.origin;
const offsetX = Math.round(frameX) - frameX;
const offsetY = Math.round(frameY) - frameY;
const drawingBounds = CGRectOffset(layer.bounds, offsetX, offsetY);
const layerBounds = layer.bounds;

layer.borderColor = null;
layer.borderWidth = 0;
layer.cornerRadius = 0;

const cappedOuterRadii = calculateNonUniformBorderCappedRadii(drawingBounds, background);
const cappedOuterRadii = calculateNonUniformBorderCappedRadii(layerBounds, background);
if (nativeView.maskType === iosViewUtils.LayerMask.BORDER && layer.mask instanceof CAShapeLayer) {
layer.mask.path = generateNonUniformBorderOuterClipPath(drawingBounds, cappedOuterRadii);
layer.mask.path = generateNonUniformBorderOuterClipPath(layerBounds, cappedOuterRadii);
}

if (background.hasBorderWidth()) {
Expand All @@ -750,15 +745,21 @@ function drawNonUniformBorders(nativeView: NativeScriptUIView, background: Backg
}

if (background.hasUniformBorderColor()) {
// Use anti-aliasing or borders will draw incorrectly at times
nativeView.borderLayer.shouldRasterize = true;
nativeView.borderLayer.rasterizationScale = Screen.mainScreen.scale;
nativeView.borderLayer.fillColor = background.borderTopColor?.ios?.CGColor || UIColor.blackColor.CGColor;
nativeView.borderLayer.path = generateNonUniformBorderInnerClipPath(drawingBounds, background, cappedOuterRadii);
nativeView.borderLayer.path = generateNonUniformBorderInnerClipPath(layerBounds, background, cappedOuterRadii);
} else {
// Non-uniform borders need more layers in order to display multiple colors at the same time
let borderTopLayer, borderRightLayer, borderBottomLayer, borderLeftLayer;

if (!nativeView.hasNonUniformBorderColor) {
const maskLayer = CAShapeLayer.new();
maskLayer.fillRule = kCAFillRuleEvenOdd;
// Use anti-aliasing or borders will draw incorrectly at times
maskLayer.shouldRasterize = true;
maskLayer.rasterizationScale = Screen.mainScreen.scale;
nativeView.borderLayer.mask = maskLayer;

borderTopLayer = CAShapeLayer.new();
Expand All @@ -779,7 +780,7 @@ function drawNonUniformBorders(nativeView: NativeScriptUIView, background: Backg
borderLeftLayer = nativeView.borderLayer.sublayers[3];
}

const paths = generateNonUniformMultiColorBorderPaths(drawingBounds, background);
const paths = generateNonUniformMultiColorBorderPaths(layerBounds, background);

borderTopLayer.fillColor = background.borderTopColor?.ios?.CGColor || UIColor.blackColor.CGColor;
borderTopLayer.path = paths[0];
Expand All @@ -792,7 +793,7 @@ function drawNonUniformBorders(nativeView: NativeScriptUIView, background: Backg

// Clip inner area to create borders
if (nativeView.borderLayer.mask instanceof CAShapeLayer) {
nativeView.borderLayer.mask.path = generateNonUniformBorderInnerClipPath(drawingBounds, background, cappedOuterRadii);
nativeView.borderLayer.mask.path = generateNonUniformBorderInnerClipPath(layerBounds, background, cappedOuterRadii);
}
}
}
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