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FlutterClippingMaskView Class Reference

`#import <FlutterPlatformViews_Internal.h>`

Inheritance diagram for FlutterClippingMaskView:

## Instance Methods
(instancetype) | - initWithFrame:screenScale:
(void) | - reset
(void) | - clipRect:matrix:
(void) | - clipRRect:matrix:
(void) | - clipPath:matrix:

## Detailed Description

Definition at line 28 of file FlutterPlatformViews_Internal.h.

## Method Documentation

## ◆ clipPath:matrix:

- (void) clipPath: |  | (const SkPath&) | path
matrix: |  | (const SkMatrix&) | matrix

Definition at line 385 of file FlutterPlatformViews_Internal.mm.

385 :(const SkPath&)path matrix:(const SkMatrix&)matrix {
386 if (!path.isValid()) {
387 return;
388 }
389 if (path.isEmpty()) {
390 return;
391 }
392 CGMutablePathRef pathRef = CGPathCreateMutable();
393
394 // Loop through all verbs and translate them into CGPath
395 SkPath::Iter iter(path, true);
396 SkPoint pts[kMaxPointsInVerb];
397 SkPath::Verb verb = iter.next(pts);
398 SkPoint last_pt_from_last_verb = SkPoint::Make(0, 0);
399 while (verb != SkPath::kDone_Verb) {
400 if (verb == SkPath::kLine_Verb || verb == SkPath::kQuad_Verb || verb == SkPath::kConic_Verb ||
401 verb == SkPath::kCubic_Verb) {
402 FML_DCHECK(last_pt_from_last_verb == pts[0]);
403 }
404 switch (verb) {
405 case SkPath::kMove_Verb: {
406 CGPathMoveToPoint(pathRef, nil, pts[0].x(), pts[0].y());
407 last_pt_from_last_verb = pts[0];
408 break;
409 }
410 case SkPath::kLine_Verb: {
411 CGPathAddLineToPoint(pathRef, nil, pts[1].x(), pts[1].y());
412 last_pt_from_last_verb = pts[1];
413 break;
414 }
415 case SkPath::kQuad_Verb: {
416 CGPathAddQuadCurveToPoint(pathRef, nil, pts[1].x(), pts[1].y(), pts[2].x(), pts[2].y());
417 last_pt_from_last_verb = pts[2];
418 break;
419 }
420 case SkPath::kConic_Verb: {
421 // Conic is not available in quartz, we use quad to approximate.
422 // TODO(cyanglaz): Better approximate the conic path.
423 // https://github.com/flutter/flutter/issues/35062
424 CGPathAddQuadCurveToPoint(pathRef, nil, pts[1].x(), pts[1].y(), pts[2].x(), pts[2].y());
425 last_pt_from_last_verb = pts[2];
426 break;
427 }
428 case SkPath::kCubic_Verb: {
429 CGPathAddCurveToPoint(pathRef, nil, pts[1].x(), pts[1].y(), pts[2].x(), pts[2].y(),
430 pts[3].x(), pts[3].y());
431 last_pt_from_last_verb = pts[3];
432 break;
433 }
434 case SkPath::kClose_Verb: {
435 CGPathCloseSubpath(pathRef);
436 break;
437 }
438 case SkPath::kDone_Verb: {
439 break;
440 }
441 }
442 verb = iter.next(pts);
443 }
444 // The `matrix` is based on the physical pixels, convert it to UIKit points.
445 CATransform3D matrixInPoints =
446 CATransform3DConcat(flutter::GetCATransform3DFromSkMatrix(matrix), _reverseScreenScale);
447 paths_.push_back([self getTransformedPath:pathRef matrix:matrixInPoints]);
448 }

References flutter::GetCATransform3DFromSkMatrix().

## ◆ clipRect:matrix:

- (void) clipRect: |  | (const SkRect&) | clipSkRect
matrix: |  | (const SkMatrix&) | matrix

Definition at line 307 of file FlutterPlatformViews_Internal.mm.

307 :(const SkRect&)clipSkRect matrix:(const SkMatrix&)matrix {
308 CGRect clipRect = flutter::GetCGRectFromSkRect(clipSkRect);
309 CGPathRef path = CGPathCreateWithRect(clipRect, nil);
310 // The `matrix` is based on the physical pixels, convert it to UIKit points.
311 CATransform3D matrixInPoints =
312 CATransform3DConcat(flutter::GetCATransform3DFromSkMatrix(matrix), _reverseScreenScale);
313 paths_.push_back([self getTransformedPath:path matrix:matrixInPoints]);
314 }

References flutter::GetCATransform3DFromSkMatrix(), and flutter::GetCGRectFromSkRect().

Referenced by clipRRect:matrix:.

## ◆ clipRRect:matrix:

- (void) clipRRect: |  | (const SkRRect&) | clipSkRRect
matrix: |  | (const SkMatrix&) | matrix

Definition at line 316 of file FlutterPlatformViews_Internal.mm.

316 :(const SkRRect&)clipSkRRect matrix:(const SkMatrix&)matrix {
317 CGPathRef pathRef = nullptr;
318 switch (clipSkRRect.getType()) {
319 case SkRRect::kEmpty_Type: {
320 break;
321 }
322 case SkRRect::kRect_Type: {
323 [self clipRect:clipSkRRect.rect() matrix:matrix];
324 return;
325 }
326 case SkRRect::kOval_Type:
327 case SkRRect::kSimple_Type: {
328 CGRect clipRect = flutter::GetCGRectFromSkRect(clipSkRRect.rect());
329 pathRef = CGPathCreateWithRoundedRect(clipRect, clipSkRRect.getSimpleRadii().x(),
330 clipSkRRect.getSimpleRadii().y(), nil);
331 break;
332 }
333 case SkRRect::kNinePatch_Type:
334 case SkRRect::kComplex_Type: {
335 CGMutablePathRef mutablePathRef = CGPathCreateMutable();
336 // Complex types, we manually add each corner.
337 SkRect clipSkRect = clipSkRRect.rect();
338 SkVector topLeftRadii = clipSkRRect.radii(SkRRect::kUpperLeft_Corner);
339 SkVector topRightRadii = clipSkRRect.radii(SkRRect::kUpperRight_Corner);
340 SkVector bottomRightRadii = clipSkRRect.radii(SkRRect::kLowerRight_Corner);
341 SkVector bottomLeftRadii = clipSkRRect.radii(SkRRect::kLowerLeft_Corner);
342
343 // Start drawing RRect
344 // Move point to the top left corner adding the top left radii's x.
345 CGPathMoveToPoint(mutablePathRef, nil, clipSkRect.fLeft + topLeftRadii.x(), clipSkRect.fTop);
346 // Move point horizontally right to the top right corner and add the top right curve.
347 CGPathAddLineToPoint(mutablePathRef, nil, clipSkRect.fRight - topRightRadii.x(),
348 clipSkRect.fTop);
349 CGPathAddCurveToPoint(mutablePathRef, nil, clipSkRect.fRight, clipSkRect.fTop,
350 clipSkRect.fRight, clipSkRect.fTop + topRightRadii.y(),
351 clipSkRect.fRight, clipSkRect.fTop + topRightRadii.y());
352 // Move point vertically down to the bottom right corner and add the bottom right curve.
353 CGPathAddLineToPoint(mutablePathRef, nil, clipSkRect.fRight,
354 clipSkRect.fBottom - bottomRightRadii.y());
355 CGPathAddCurveToPoint(mutablePathRef, nil, clipSkRect.fRight, clipSkRect.fBottom,
356 clipSkRect.fRight - bottomRightRadii.x(), clipSkRect.fBottom,
357 clipSkRect.fRight - bottomRightRadii.x(), clipSkRect.fBottom);
358 // Move point horizontally left to the bottom left corner and add the bottom left curve.
359 CGPathAddLineToPoint(mutablePathRef, nil, clipSkRect.fLeft + bottomLeftRadii.x(),
360 clipSkRect.fBottom);
361 CGPathAddCurveToPoint(mutablePathRef, nil, clipSkRect.fLeft, clipSkRect.fBottom,
362 clipSkRect.fLeft, clipSkRect.fBottom - bottomLeftRadii.y(),
363 clipSkRect.fLeft, clipSkRect.fBottom - bottomLeftRadii.y());
364 // Move point vertically up to the top left corner and add the top left curve.
365 CGPathAddLineToPoint(mutablePathRef, nil, clipSkRect.fLeft,
366 clipSkRect.fTop + topLeftRadii.y());
367 CGPathAddCurveToPoint(mutablePathRef, nil, clipSkRect.fLeft, clipSkRect.fTop,
368 clipSkRect.fLeft + topLeftRadii.x(), clipSkRect.fTop,
369 clipSkRect.fLeft + topLeftRadii.x(), clipSkRect.fTop);
370 CGPathCloseSubpath(mutablePathRef);
371
372 pathRef = mutablePathRef;
373 break;
374 }
375 }
376 // The `matrix` is based on the physical pixels, convert it to UIKit points.
377 CATransform3D matrixInPoints =
378 CATransform3DConcat(flutter::GetCATransform3DFromSkMatrix(matrix), _reverseScreenScale);
379 // TODO(cyanglaz): iOS does not seem to support hard edge on CAShapeLayer. It clearly stated that
380 // the CAShaperLayer will be drawn antialiased. Need to figure out a way to do the hard edge
381 // clipping on iOS.
382 paths_.push_back([self getTransformedPath:pathRef matrix:matrixInPoints]);
383 }

References clipRect:matrix:, flutter::GetCATransform3DFromSkMatrix(), and flutter::GetCGRectFromSkRect().

## ◆ initWithFrame:screenScale:

- (instancetype) initWithFrame: |  | (CGRect) | frame
screenScale: |  | (CGFloat) | screenScale

Definition at line 270 of file FlutterPlatformViews_Internal.mm.

270 :(CGRect)frame screenScale:(CGFloat)screenScale {
271 if (self = [super initWithFrame:frame]) {
272 self.backgroundColor = UIColor.clearColor;
273 _reverseScreenScale = CATransform3DMakeScale(1 / screenScale, 1 / screenScale, 1);
274 }
275 return self;
276 }

References initWithFrame.

## ◆ reset

- (void) reset |  |  |

Definition at line 278 of file FlutterPlatformViews_Internal.mm.

278 {
279 paths_.clear();
280 [self setNeedsDisplay];
281 }

The documentation for this class was generated from the following files:

- shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.h
- shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.mm

initWithFrame
instancetype initWithFrame
Definition: FlutterTextInputPlugin.h:164
flutter::GetCATransform3DFromSkMatrix
CATransform3D GetCATransform3DFromSkMatrix(const SkMatrix &matrix)
Definition: FlutterPlatformViews_Internal.mm:41
flutter::GetCGRectFromSkRect
CGRect GetCGRectFromSkRect(const SkRect &clipSkRect)
Definition: FlutterPlatformViews_Internal.mm:62