LottieSlot: Gradient sample enhancement

[tinyjin]

added gradient geometry and opacity

"gradient_fill":{"p":{"p":2,"k":{"k":[0,0.1,0.1,0.2,1,1,0.1,0.2,0,0,1,1]}}},
"gradient_opacity":{"p":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[100],"t":0},{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[30],"t":60},{"s":[100],"t":120}]}},
"gradient_start":{"p":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"s":[-80,-40],"t":0},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"s":[80,40],"t":60},{"s":[-80,-40],"t":120}]}},
"gradient_end":{"p":{"a":0,"k":[110,0]}},
"gradient_height":{"p":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[0],"t":0},{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[90],"t":60},{"s":[0],"t":120}]}},
"gradient_angle":{"p":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[0],"t":0},{"s":[360],"t":120}]}}

[Copilot]

Pull request overview

This PR enhances the ThorVG Lottie “slot” example for gradients by expanding the sample slot payload and updating the corresponding Lottie asset so the gradient’s color stops, opacity, and geometry-related properties can be overridden via slots.

Changes:

• Expanded the gradient slot sample JSON in LottieSlot.cpp to include fill stops, opacity, start/end points, height, and angle.
• Updated slot1.json to attach sid values for the corresponding gradient properties (including opacity and geometry fields).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/LottieSlot.cpp	Extends the gradient slot example payload to cover additional gradient properties.
res/lottie/extensions/slot1.json	Updates the gradient fill object to expose more properties via slot sids (opacity/start/end/height/angle).

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