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firestar5683
99a8b1c07e
Manage named devices, car-first projection reconnect, and saved head-unit layouts. Keep runtime-safe Bluetooth operations available without changing controller ownership or restarting the radio unnecessarily.
33 lines
1.3 KiB
Python
33 lines
1.3 KiB
Python
"""Uniform projection geometry inside receiver-advertised margins."""
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from dataclasses import dataclass
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# Landscape 3:2 is a composition fallback only. It is not an advertised video
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# mode and cannot replace a missing/invalid negotiated FrameRequest.
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FALLBACK_VIEWPORT = (1860, 1240)
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@dataclass(frozen=True)
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class ProjectionGeometry:
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width: int
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height: int
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logical_width: int
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logical_height: int
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scale: float
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def projection_geometry(width: int, height: int, margin_w: int = 0, margin_h: int = 0) -> ProjectionGeometry:
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if not 0 <= margin_w < width or not 0 <= margin_h < height:
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raise ValueError("No visible car display area")
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visible_w, visible_h = width - margin_w, height - margin_h
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# Expand the scene, never crop the original 1860x1080 road/HUD canvas.
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scale = min(visible_w / 1860, visible_h / 1080)
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logical_w, logical_h = round(visible_w / scale), round(visible_h / scale)
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# Bound the intermediate GPU texture to 4096x2160 (about 34 MiB RGBA).
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# Extreme valid margins still retain the protocol frame; contain the requested
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# 3:2 fallback scene rather than allocate an unbounded logical texture.
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if logical_w > 4096 or logical_h > 2160:
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logical_w, logical_h = FALLBACK_VIEWPORT
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scale = min(visible_w / logical_w, visible_h / logical_h)
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return ProjectionGeometry(visible_w, visible_h, logical_w, logical_h, scale)
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