Effects: CC Smear and CC Tiler on text and shape layers reach past the content's box (#659)

A text or shape layer's effect bounds are comp-sized (as in After Effects),
but its buffer surrounds only its content, and each effect grows the buffer
itself when it needs room. CC Smear and CC Tiler never did, so a smear was
cut off where the glyphs end and tiles filled only the text's box.

CC Tiler now covers the whole layer rectangle; CC Smear grows by how far it
moves pixels (Reach x From->To), at most to the layer bounds, so footage
layers, whose buffer is their bounds already, are unchanged. CPU and GPU
alike.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01QiAJeFttZp83Fh7YuzAR5f

crates/gpu/src/fx_stylize.rs

@@ -299,10 +299,13 @@ fn cc_slant(e: &mut Enc, ctx: &EffectCtx, mut b: GBuf) -> Option<GBuf> {
     )
 }
 
-fn cc_smear(e: &mut Enc, ctx: &EffectCtx, b: GBuf) -> Option<GBuf> {
+fn cc_smear(e: &mut Enc, ctx: &EffectCtx, mut b: GBuf) -> Option<GBuf> {
+    let reach = ctx.params.f("reach") / 100.0;
+    if !ctx.adjustment {
+        b.pad(e, effectcraft_effects::cc_smear_pad(ctx, [b.img.width, b.img.height], b.offset, b.scale))?;
+    }
     let from = b.to_px(ctx.params.v2("from"));
     let to = b.to_px(ctx.params.v2("to"));
-    let reach = ctx.params.f("reach") / 100.0;
     let radius = (ctx.params.f("radius") * b.scale).max(0.5);
     let (dx, dy) = (to.0 - from.0, to.1 - from.1);
     let l2 = dx * dx + dy * dy;
@@ -585,8 +588,11 @@ fn offset(e: &mut Enc, ctx: &EffectCtx, b: GBuf) -> Option<GBuf> {
     table(e, b, &data, false, blend.max(0.0))
 }
 
-fn cc_tiler(e: &mut Enc, ctx: &EffectCtx, b: GBuf) -> Option<GBuf> {
+fn cc_tiler(e: &mut Enc, ctx: &EffectCtx, mut b: GBuf) -> Option<GBuf> {
     let s = (ctx.params.f("scale") / 100.0).max(0.001);
+    if !ctx.adjustment {
+        b.pad(e, effectcraft_effects::util::layer_cover_pad(ctx, [b.img.width, b.img.height], b.offset, b.scale))?;
+    }
     let c = b.to_px(ctx.params.v2("center"));
     let blend = (ctx.params.f("blendWithOriginal") / 100.0) as f32;
     let (x0, y0, w, h) = layer_rect(ctx, &b);