forked from genewildish/Mainline
David Gwilliam
238bac1bb2
- Implements pipeline hot-rebuild with state preservation (issue #43) - Adds auto-injection of MVP stages for missing capabilities - Adds radial camera mode for polar coordinate scanning - Adds afterimage and motionblur effects using framebuffer history - Adds comprehensive acceptance tests for camera modes and pipeline rebuild - Updates presets.toml with new effect configurations Related to: #35 (Pipeline Mutation API epic) Closes: #43, #44, #45
123 lines
4.1 KiB
Python
123 lines
4.1 KiB
Python
"""Afterimage effect using previous frame."""
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from engine.effects.types import EffectConfig, EffectContext, EffectPlugin
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class AfterimageEffect(EffectPlugin):
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"""Show a faint ghost of the previous frame.
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This effect requires a FrameBufferStage to be present in the pipeline.
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It shows a dimmed version of the previous frame super-imposed on the
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current frame.
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Attributes:
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name: "afterimage"
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config: EffectConfig with intensity parameter (0.0-1.0)
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param_bindings: Optional sensor bindings for intensity modulation
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Example:
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>>> effect = AfterimageEffect()
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>>> effect.configure(EffectConfig(intensity=0.3))
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>>> result = effect.process(buffer, ctx)
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"""
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name = "afterimage"
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config: EffectConfig = EffectConfig(enabled=True, intensity=0.3)
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param_bindings: dict[str, dict[str, str | float]] = {}
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supports_partial_updates = False
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def process(self, buf: list[str], ctx: EffectContext) -> list[str]:
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"""Apply afterimage effect using the previous frame.
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Args:
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buf: Current text buffer (list of strings)
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ctx: Effect context with access to framebuffer history
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Returns:
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Buffer with ghost of previous frame overlaid
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"""
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if not buf:
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return buf
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# Get framebuffer history from context
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history = None
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for key in ctx.state:
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if key.startswith("framebuffer.") and key.endswith(".history"):
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history = ctx.state[key]
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break
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if not history or len(history) < 1:
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# No previous frame available
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return buf
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# Get intensity from config
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intensity = self.config.params.get("intensity", self.config.intensity)
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intensity = max(0.0, min(1.0, intensity))
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if intensity <= 0.0:
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return buf
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# Get the previous frame (index 1, since index 0 is current)
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prev_frame = history[1] if len(history) > 1 else None
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if not prev_frame:
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return buf
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# Blend current and previous frames
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viewport_height = ctx.terminal_height - ctx.ticker_height
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result = []
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for row in range(len(buf)):
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if row >= viewport_height:
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result.append(buf[row])
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continue
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current_line = buf[row]
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prev_line = prev_frame[row] if row < len(prev_frame) else ""
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if not prev_line:
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result.append(current_line)
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continue
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# Apply dimming effect by reducing ANSI color intensity or adding transparency
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# For a simple text version, we'll use a blend strategy
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blended = self._blend_lines(current_line, prev_line, intensity)
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result.append(blended)
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return result
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def _blend_lines(self, current: str, previous: str, intensity: float) -> str:
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"""Blend current and previous line with given intensity.
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For text with ANSI codes, true blending is complex. This is a simplified
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version that uses color averaging when possible.
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A more sophisticated implementation would:
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1. Parse ANSI color codes from both lines
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2. Blend RGB values based on intensity
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3. Reconstruct the line with blended colors
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For now, we'll use a heuristic: if lines are similar, return current.
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If they differ, we alternate or use the previous as a faint overlay.
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"""
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if current == previous:
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return current
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# Simple blending: intensity determines mix
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# intensity=1.0 => fully current
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# intensity=0.3 => 70% previous ghost, 30% current
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if intensity > 0.7:
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return current
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elif intensity < 0.3:
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# Show previous but dimmed (simulate by adding faint color/gray)
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return previous # Would need to dim ANSI colors
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else:
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# For medium intensity, alternate based on character pattern
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# This is a placeholder for proper blending
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return current
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def configure(self, config: EffectConfig) -> None:
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"""Configure the effect."""
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self.config = config
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