예제 #1
0
        public static Visual ApplyDropShadow(
            LayerContext context,
            Visual source,
            DropShadowEffect dropShadowEffect)
        {
            if (!context.ObjectFactory.IsUapApiAvailable(nameof(CompositionVisualSurface), versionDependentFeatureDescription: "Drop Shadow"))
            {
                // The effect can't be displayed on the targeted version.
                return(source);
            }

            Debug.Assert(dropShadowEffect.IsEnabled, "Precondition");
            Debug.Assert(context is PreCompLayerContext || context is ShapeLayerContext, "Precondition");

            // Shadow:
            // +------------------+
            // | Container Visual | -- Has the final composited result.
            // +------------------+ <
            //     ^ Child #1        \ Child #2 (original layer)
            //     | (shadow layer)   \
            //     |                   \
            // +---------------------+  \
            // | ApplyGaussianBlur() |   \
            // +---------------------+   +-----------------+
            //     ^                     | ContainerVisual | - Original Visual node.
            //     |                     +-----------------+
            // +----------------+           .
            // | SpriteVisual   |           .
            // +----------------+           .
            //     ^ Source                 .
            //     |                        .
            // +--------------+             .
            // | MaskBrush    |             .
            // +--------------+             .
            //     ^ Source   ^ Mask        . Source
            //     |           \            V
            // +----------+   +---------------+
            // |ColorBrush|   | VisualSurface |
            // +----------+   +---------------+
            GaussianBlurEffect gaussianBlurEffect = new GaussianBlurEffect(
                name: dropShadowEffect.Name + "_blur",
                isEnabled: true,
                blurriness: dropShadowEffect.Softness,
                blurDimensions: new Animatable <Enum <BlurDimension> >(BlurDimension.HorizontalAndVertical),
                repeatEdgePixels: new Animatable <bool>(true),
                forceGpuRendering: true);

            var factory = context.ObjectFactory;
            var size    = context.CompositionContext.Size;

            if (context is PreCompLayerContext)
            {
                size = ConvertTo.Vector2(((PreCompLayerContext)context).Layer.Width, ((PreCompLayerContext)context).Layer.Height);
            }

            var visualSurface = factory.CreateVisualSurface();

            visualSurface.SourceSize   = size;
            visualSurface.SourceVisual = source;

            var maskBrush = factory.CreateMaskBrush();

            var colorBrush = factory.CreateColorBrush(dropShadowEffect.Color.InitialValue);

            var color = Optimizer.TrimAnimatable(context, dropShadowEffect.Color);

            if (color.IsAnimated)
            {
                Animate.Color(context, color, colorBrush, nameof(colorBrush.Color));
            }
            else
            {
                colorBrush.Color = ConvertTo.Color(color.InitialValue);
            }

            maskBrush.Source = colorBrush;
            maskBrush.Mask   = factory.CreateSurfaceBrush(visualSurface);

            var shadowSpriteVisual = factory.CreateSpriteVisual();

            shadowSpriteVisual.Size  = size;
            shadowSpriteVisual.Brush = maskBrush;

            var blurResult = ApplyGaussianBlur(context, shadowSpriteVisual, gaussianBlurEffect);

            var opacity = Optimizer.TrimAnimatable(context, dropShadowEffect.Opacity);

            if (opacity.IsAnimated)
            {
                Animate.Opacity(context, opacity, blurResult, nameof(blurResult.Opacity));
            }
            else
            {
                blurResult.Opacity = (float)opacity.InitialValue.Value;
            }

            // Convert direction and distance to a Vector3.
            var direction = Optimizer.TrimAnimatable(context, dropShadowEffect.Direction);
            var distance  = Optimizer.TrimAnimatable(context, dropShadowEffect.Distance);

            if (direction.IsAnimated)
            {
                if (distance.IsAnimated)
                {
                    // Direction and distance are animated.
                    // NOTE: we could support this in some cases. The worst cases are
                    //       where the keyframes don't line up, and/or the easings are different
                    //       between distance and direction.
                    context.Issues.AnimatedLayerEffectParameters("drop shadow");
                }
                else
                {
                    // Only direction is animated.
                    var distanceValue = distance.InitialValue;
                    var keyFrames     = direction.KeyFrames.Select(
                        kf => new KeyFrame <Vector3>(kf.Frame, VectorFromRotationAndDistance(kf.Value, distanceValue), kf.Easing)).ToArray();
                    var directionAnimation = new TrimmedAnimatable <Vector3>(context, keyFrames[0].Value, keyFrames);
                    Animate.Vector3(context, directionAnimation, blurResult, nameof(blurResult.Offset));
                }
            }
            else if (distance.IsAnimated)
            {
                // Only distance is animated.
                var directionRadians = direction.InitialValue.Radians;
                var keyFrames        = distance.KeyFrames.Select(
                    kf => new KeyFrame <Vector3>(kf.Frame, VectorFromRotationAndDistance(directionRadians, kf.Value), kf.Easing)).ToArray();
                var distanceAnimation = new TrimmedAnimatable <Vector3>(context, keyFrames[0].Value, keyFrames);
                Animate.Vector3(context, distanceAnimation, blurResult, nameof(blurResult.Offset));
            }
            else
            {
                // Direction and distance are both not animated.
                var directionRadians = direction.InitialValue.Radians;
                var distanceValue    = distance.InitialValue;

                blurResult.Offset = ConvertTo.Vector3(VectorFromRotationAndDistance(direction.InitialValue, distance.InitialValue));
            }

            var result = factory.CreateContainerVisual();

            result.Size = size;
            result.Children.Add(blurResult);

            // Check if ShadowOnly can be false
            if (!dropShadowEffect.IsShadowOnly.IsAlways(true))
            {
                // Check if ShadowOnly can be true
                if (!dropShadowEffect.IsShadowOnly.IsAlways(false))
                {
                    var isVisible = FlipBoolAnimatable(dropShadowEffect.IsShadowOnly); // isVisible = !isShadowOnly

                    source.IsVisible = isVisible.InitialValue;
                    if (isVisible.IsAnimated)
                    {
                        Animate.Boolean(
                            context,
                            Optimizer.TrimAnimatable(context, isVisible),
                            source,
                            nameof(blurResult.IsVisible));
                    }
                }

                result.Children.Add(source);
            }

            return(result);
        }
예제 #2
0
        static LayerVisual ApplyDropShadow(PreCompLayerContext context, Visual visual, DropShadowEffect dropShadowEffect)
        {
            Debug.Assert(dropShadowEffect.IsEnabled, "Precondition");

            // Create a LayerVisual so we can add a drop shadow.
            var result = context.ObjectFactory.CreateLayerVisual();

            result.Children.Add(visual);

            // TODO: Due to a Composition bug, LayerVisual currently must be given a size for the drop
            // shadow to show up correctly. And even then it is not reliable.
            result.Size = context.CompositionContext.Size;

            var shadow = context.ObjectFactory.CreateDropShadow();

            result.Shadow       = shadow;
            shadow.SourcePolicy = CompositionDropShadowSourcePolicy.InheritFromVisualContent;

            var isShadowOnly = Optimizer.TrimAnimatable(context, dropShadowEffect.IsShadowOnly);

            if (!isShadowOnly.IsAlways(true))
            {
                context.Issues.ShadowOnlyShadowEffect();
            }

            // TODO - it's not clear whether BlurRadius and Softness are equivalent. We may
            //        need to scale Softness to convert it to BlurRadius.
            var blurRadius = Optimizer.TrimAnimatable(context, dropShadowEffect.Softness);

            if (blurRadius.IsAnimated)
            {
                Animate.Scalar(context, blurRadius, shadow, nameof(shadow.BlurRadius));
            }
            else
            {
                shadow.BlurRadius = (float)blurRadius.InitialValue;
            }

            var color = Optimizer.TrimAnimatable(context, dropShadowEffect.Color);

            if (color.IsAnimated)
            {
                Animate.Color(context, color, shadow, nameof(shadow.Color));
            }
            else
            {
                shadow.Color = ConvertTo.Color(color.InitialValue);
            }

            var opacity = Optimizer.TrimAnimatable(context, dropShadowEffect.Opacity);

            if (opacity.IsAnimated)
            {
                Animate.Opacity(context, opacity, shadow, nameof(shadow.Opacity));
            }
            else
            {
                shadow.Opacity = (float)opacity.InitialValue.Value;
            }

            // Convert direction and distance to a Vector3.
            var direction = Optimizer.TrimAnimatable(context, dropShadowEffect.Direction);
            var distance  = Optimizer.TrimAnimatable(context, dropShadowEffect.Distance);

            if (direction.IsAnimated)
            {
                if (distance.IsAnimated)
                {
                    // Direction and distance are animated.
                    // NOTE: we could support this in some cases. The worst cases are
                    //       where the keyframes don't line up, and/or the easings are different
                    //       between distance and direction.
                    context.Issues.AnimatedLayerEffectParameters("drop shadow");
                }
                else
                {
                    // Only direction is animated.
                    var distanceValue = distance.InitialValue;
                    var keyFrames     = direction.KeyFrames.Select(
                        kf => new KeyFrame <Vector3>(kf.Frame, VectorFromRotationAndDistance(kf.Value, distanceValue), kf.Easing)).ToArray();
                    var directionAnimation = new TrimmedAnimatable <Vector3>(context, keyFrames[0].Value, keyFrames);
                    Animate.Vector3(context, directionAnimation, shadow, nameof(shadow.Offset));
                }
            }
            else if (distance.IsAnimated)
            {
                // Only distance is animated.
                var directionRadians = direction.InitialValue.Radians;
                var keyFrames        = distance.KeyFrames.Select(
                    kf => new KeyFrame <Vector3>(kf.Frame, VectorFromRotationAndDistance(directionRadians, kf.Value), kf.Easing)).ToArray();
                var distanceAnimation = new TrimmedAnimatable <Vector3>(context, keyFrames[0].Value, keyFrames);
                Animate.Vector3(context, distanceAnimation, shadow, nameof(shadow.Offset));
            }
            else
            {
                // Direction and distance are both not animated.
                var directionRadians = direction.InitialValue.Radians;
                var distanceValue    = distance.InitialValue;

                shadow.Offset = ConvertTo.Vector3(VectorFromRotationAndDistance(direction.InitialValue, distance.InitialValue));
            }

            return(result);
        }