part of dart._skwasm_impl;
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.



class SkwasmCanvas implements LayerCanvas {
  factory SkwasmCanvas(SkwasmPictureRecorder recorder, ui.Rect cullRect) => SkwasmCanvas.fromHandle(
    withStackScope(
      (StackScope s) =>
          pictureRecorderBeginRecording(recorder.handle, s.convertRectToNative(cullRect)),
    ),
  );

  SkwasmCanvas.fromHandle(this._handle);
  CanvasHandle _handle;

  // Note that we do not need to deal with the finalizer registry here, because
  // the underlying native skia object is tied directly to the lifetime of the
  // associated SkPictureRecorder.

  @override
  void save() {
    canvasSave(_handle);
  }

  @override
  void saveLayer(ui.Rect? bounds, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    if (bounds != null) {
      withStackScope((StackScope s) {
        canvasSaveLayer(_handle, s.convertRectToNative(bounds), paintHandle, nullptr);
      });
    } else {
      canvasSaveLayer(_handle, nullptr, paintHandle, nullptr);
    }
    paintDispose(paintHandle);
  }

  @override
  void saveLayerWithFilter(ui.Rect? bounds, ui.Paint paint, ui.ImageFilter imageFilter) {
    // There are 2 ImageFilter objects applied here. The filter in the paint
    // object is applied to the contents and its default tile mode is decal
    // (automatically applied by toSkPaint).
    // The filter supplied as an argument to this function [nativeFilter] will
    // be applied to the backdrop and its default tile mode will be mirror.
    // We also pass in the blur tile mode as an argument to saveLayer because
    // that operation will not adopt the tile mode from the backdrop filter
    // and instead needs it supplied to the saveLayer call itself as a
    // separate argument.
    final nativeFilter = SkwasmImageFilter.fromUiFilter(imageFilter);
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint(/*ui.TileMode.decal*/);
    if (bounds != null) {
      withStackScope((StackScope s) {
        nativeFilter.withRawImageFilter((nativeFilterHandle) {
          canvasSaveLayer(_handle, s.convertRectToNative(bounds), paintHandle, nativeFilterHandle);
        }, defaultBlurTileMode: ui.TileMode.mirror);
      });
    } else {
      nativeFilter.withRawImageFilter((nativeFilterHandle) {
        canvasSaveLayer(_handle, nullptr, paintHandle, nativeFilterHandle);
      }, defaultBlurTileMode: ui.TileMode.mirror);
    }
    paintDispose(paintHandle);
  }

  @override
  void restore() {
    canvasRestore(_handle);
  }

  @override
  void restoreToCount(int count) {
    canvasRestoreToCount(_handle, count);
  }

  @override
  int getSaveCount() => canvasGetSaveCount(_handle);

  @override
  void translate(double dx, double dy) => canvasTranslate(_handle, dx, dy);

  @override
  void scale(double sx, [double? sy]) => canvasScale(_handle, sx, sy ?? sx);

  @override
  void rotate(double radians) => canvasRotate(_handle, ui.toDegrees(radians));

  @override
  void skew(double sx, double sy) => canvasSkew(_handle, sx, sy);

  @override
  void transform(Float64List matrix4) {
    withStackScope((StackScope s) {
      canvasTransform(_handle, s.convertMatrix44toNative(matrix4));
    });
  }

  @override
  void clipRect(ui.Rect rect, {ui.ClipOp clipOp = ui.ClipOp.intersect, bool doAntiAlias = true}) {
    withStackScope((StackScope s) {
      canvasClipRect(_handle, s.convertRectToNative(rect), clipOp.index, doAntiAlias);
    });
  }

  @override
  void clipRRect(ui.RRect rrect, {bool doAntiAlias = true}) {
    withStackScope((StackScope s) {
      canvasClipRRect(_handle, s.convertRRectToNative(rrect), doAntiAlias);
    });
  }

  @override
  void clipRSuperellipse(ui.RSuperellipse rsuperellipse, {bool doAntiAlias = true}) {
    final (ui.Path path, ui.Offset offset) = rsuperellipse.toPathOffset();
    translate(offset.dx, offset.dy);
    clipPath(path, doAntiAlias: doAntiAlias);
    translate(-offset.dx, -offset.dy);
  }

  @override
  void clipPath(ui.Path path, {bool doAntiAlias = true}) {
    canvasClipPath(_handle, ((path as LazyPath).builtPath as SkwasmPath).handle, doAntiAlias);
  }

  @override
  void drawColor(ui.Color color, ui.BlendMode blendMode) =>
      canvasDrawColor(_handle, color.value, blendMode.index);

  @override
  void drawLine(ui.Offset p1, ui.Offset p2, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    canvasDrawLine(_handle, p1.dx, p1.dy, p2.dx, p2.dy, paintHandle);
    paintDispose(paintHandle);
  }

  @override
  void drawPaint(ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    canvasDrawPaint(_handle, paintHandle);
    paintDispose(paintHandle);
  }

  @override
  void drawRect(ui.Rect rect, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    withStackScope((StackScope s) {
      canvasDrawRect(_handle, s.convertRectToNative(rect), paintHandle);
    });
    paintDispose(paintHandle);
  }

  @override
  void drawRRect(ui.RRect rrect, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    withStackScope((StackScope s) {
      canvasDrawRRect(_handle, s.convertRRectToNative(rrect), paintHandle);
    });
    paintDispose(paintHandle);
  }

  @override
  void drawRSuperellipse(ui.RSuperellipse rsuperellipse, ui.Paint paint) {
    final (ui.Path path, ui.Offset offset) = rsuperellipse.toPathOffset();
    translate(offset.dx, offset.dy);
    drawPath(path, paint);
    translate(-offset.dx, -offset.dy);
  }

  @override
  void drawDRRect(ui.RRect outer, ui.RRect inner, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    withStackScope((StackScope s) {
      canvasDrawDRRect(
        _handle,
        s.convertRRectToNative(outer),
        s.convertRRectToNative(inner),
        paintHandle,
      );
    });
    paintDispose(paintHandle);
  }

  @override
  void drawOval(ui.Rect rect, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    withStackScope((StackScope s) {
      canvasDrawOval(_handle, s.convertRectToNative(rect), paintHandle);
    });
    paintDispose(paintHandle);
  }

  @override
  void drawCircle(ui.Offset center, double radius, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    canvasDrawCircle(_handle, center.dx, center.dy, radius, paintHandle);
    paintDispose(paintHandle);
  }

  @override
  void drawArc(ui.Rect rect, double startAngle, double sweepAngle, bool useCenter, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    withStackScope((StackScope s) {
      canvasDrawArc(
        _handle,
        s.convertRectToNative(rect),
        ui.toDegrees(startAngle),
        ui.toDegrees(sweepAngle),
        useCenter,
        paintHandle,
      );
    });
    paintDispose(paintHandle);
  }

  @override
  void drawPath(ui.Path path, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    canvasDrawPath(_handle, ((path as LazyPath).builtPath as SkwasmPath).handle, paintHandle);
    paintDispose(paintHandle);
  }

  @override
  void drawImage(ui.Image image, ui.Offset offset, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint(
      defaultBlurTileMode: ui.TileMode.clamp,
    );
    canvasDrawImage(
      _handle,
      (image as SkwasmImage).handle,
      offset.dx,
      offset.dy,
      paintHandle,
      paint.filterQuality.index,
    );
    paintDispose(paintHandle);
  }

  @override
  void drawImageRect(ui.Image image, ui.Rect src, ui.Rect dst, ui.Paint paint) {
    withStackScope((StackScope scope) {
      final Pointer<Float> sourceRect = scope.convertRectToNative(src);
      final Pointer<Float> destRect = scope.convertRectToNative(dst);
      final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint(
        defaultBlurTileMode: ui.TileMode.clamp,
      );
      canvasDrawImageRect(
        _handle,
        (image as SkwasmImage).handle,
        sourceRect,
        destRect,
        paintHandle,
        paint.filterQuality.index,
      );
      paintDispose(paintHandle);
    });
  }

  @override
  void drawImageNine(ui.Image image, ui.Rect center, ui.Rect dst, ui.Paint paint) {
    withStackScope((StackScope scope) {
      final Pointer<Int32> centerRect = scope.convertIRectToNative(center);
      final Pointer<Float> destRect = scope.convertRectToNative(dst);
      final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint(
        defaultBlurTileMode: ui.TileMode.clamp,
      );
      canvasDrawImageNine(
        _handle,
        (image as SkwasmImage).handle,
        centerRect,
        destRect,
        paintHandle,
        paint.filterQuality.index,
      );
      paintDispose(paintHandle);
    });
  }

  @override
  void drawPicture(ui.Picture picture) {
    canvasDrawPicture(_handle, (picture as SkwasmPicture).handle);
  }

  @override
  void drawParagraph(ui.Paragraph paragraph, ui.Offset offset) {
    canvasDrawParagraph(_handle, (paragraph as SkwasmParagraph).handle, offset.dx, offset.dy);
  }

  @override
  void drawPoints(ui.PointMode pointMode, List<ui.Offset> points, ui.Paint paint) =>
      withStackScope((StackScope scope) {
        final RawPointArray rawPoints = scope.convertPointArrayToNative(points);
        final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
        canvasDrawPoints(_handle, pointMode.index, rawPoints, points.length, paintHandle);
        paintDispose(paintHandle);
      });

  @override
  void drawRawPoints(ui.PointMode pointMode, Float32List points, ui.Paint paint) =>
      withStackScope((StackScope scope) {
        final RawPointArray rawPoints = scope.convertDoublesToNative(points);
        final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
        canvasDrawPoints(_handle, pointMode.index, rawPoints, points.length ~/ 2, paintHandle);
        paintDispose(paintHandle);
      });

  @override
  void drawVertices(ui.Vertices vertices, ui.BlendMode blendMode, ui.Paint paint) {
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint();
    canvasDrawVertices(_handle, (vertices as SkwasmVertices).handle, blendMode.index, paintHandle);
    paintDispose(paintHandle);
  }

  @override
  void drawAtlas(
    ui.Image atlas,
    List<ui.RSTransform> transforms,
    List<ui.Rect> rects,
    List<ui.Color>? colors,
    ui.BlendMode? blendMode,
    ui.Rect? cullRect,
    ui.Paint paint,
  ) => withStackScope((StackScope scope) {
    final RawRSTransformArray rawTransforms = scope.convertRSTransformsToNative(transforms);
    final RawRect rawRects = scope.convertRectsToNative(rects);
    final RawColorArray rawColors = colors != null
        ? scope.convertColorArrayToNative(colors)
        : nullptr;
    final RawRect rawCullRect = cullRect != null ? scope.convertRectToNative(cullRect) : nullptr;
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint(
      defaultBlurTileMode: ui.TileMode.clamp,
    );
    canvasDrawAtlas(
      _handle,
      (atlas as SkwasmImage).handle,
      rawTransforms,
      rawRects,
      rawColors,
      transforms.length,
      (blendMode ?? ui.BlendMode.src).index,
      rawCullRect,
      paintHandle,
    );
    paintDispose(paintHandle);
  });

  @override
  void drawRawAtlas(
    ui.Image atlas,
    Float32List rstTransforms,
    Float32List rects,
    Int32List? colors,
    ui.BlendMode? blendMode,
    ui.Rect? cullRect,
    ui.Paint paint,
  ) => withStackScope((StackScope scope) {
    final RawRSTransformArray rawTransforms = scope.convertDoublesToNative(rstTransforms);
    final RawRect rawRects = scope.convertDoublesToNative(rects);
    final RawColorArray rawColors = colors != null
        ? scope.convertIntsToUint32Native(colors)
        : nullptr;
    final RawRect rawCullRect = cullRect != null ? scope.convertRectToNative(cullRect) : nullptr;
    final PaintHandle paintHandle = (paint as SkwasmPaint).toRawPaint(
      defaultBlurTileMode: ui.TileMode.clamp,
    );
    canvasDrawAtlas(
      _handle,
      (atlas as SkwasmImage).handle,
      rawTransforms,
      rawRects,
      rawColors,
      rstTransforms.length ~/ 4,
      (blendMode ?? ui.BlendMode.src).index,
      rawCullRect,
      paintHandle,
    );
    paintDispose(paintHandle);
  });

  @override
  void drawShadow(ui.Path path, ui.Color color, double elevation, bool transparentOccluder) {
    canvasDrawShadow(
      _handle,
      ((path as LazyPath).builtPath as SkwasmPath).handle,
      elevation,
      EngineFlutterDisplay.instance.devicePixelRatio,
      color.value,
      transparentOccluder,
    );
  }

  @override
  ui.Rect getDestinationClipBounds() {
    return withStackScope((StackScope scope) {
      final Pointer<Int32> outRect = scope.allocInt32Array(4);
      canvasGetDeviceClipBounds(_handle, outRect);
      return scope.convertIRectFromNative(outRect);
    });
  }

  @override
  ui.Rect getLocalClipBounds() {
    final Float64List transform = getTransform();
    final matrix = Matrix4.fromFloat32List(Float32List.fromList(transform));
    if (matrix.invert() == 0) {
      // non-invertible transforms collapse space to a line or point
      return ui.Rect.zero;
    }
    return matrix.transformRect(getDestinationClipBounds());
  }

  @override
  Float64List getTransform() {
    return withStackScope((StackScope scope) {
      final Pointer<Float> outMatrix = scope.allocFloatArray(16);
      canvasGetTransform(_handle, outMatrix);
      return scope.convertMatrix44FromNative(outMatrix);
    });
  }

  @override
  void clear(ui.Color color) {
    canvasClear(_handle, color.value);
  }

  @override
  bool quickReject(ui.Rect rect) {
    return withStackScope((StackScope s) {
      return canvasQuickReject(_handle, s.convertRectToNative(rect));
    });
  }
}
