46 lines
1.9 KiB
GDScript
46 lines
1.9 KiB
GDScript
@tool
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class_name McpScreenshotEncode
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extends RefCounted
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## Shared downscale + PNG + base64 block for the screenshot paths (#716).
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##
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## Two call sites straddle the editor/game process boundary — the editor's
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## take_screenshot (editor_handler) and the game-process autoload
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## (runtime/game_helper) — and were maintained as manually synchronized
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## copies. Pure static, no editor APIs, so it loads safely in the game
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## process too.
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## Downscale `image` in place so its longest edge is at most
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## `max_resolution` (0 = no cap), then PNG-encode. Returns
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## {base64, width, height, original_width, original_height}.
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static func downscale_and_encode(image: Image, max_resolution: int, use_hdr_2d := false) -> Dictionary:
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## Compatibility readback stays sRGB, including when HDR 2D is enabled.
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## Image.linear_to_srgb requires RGB8/RGBA8: converting first quantizes
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## linear darks and clamps values above 1 rather than tone-mapping them.
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## Midgray therefore truncates approximately 54.6 -> 54 -> 126.
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if use_hdr_2d and RenderingServer.get_current_rendering_method() != "gl_compatibility":
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image.convert(Image.FORMAT_RGBA8)
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image.linear_to_srgb()
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var original_width := image.get_width()
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var original_height := image.get_height()
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if max_resolution > 0:
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var longest := maxi(original_width, original_height)
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if longest > max_resolution:
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var scale := float(max_resolution) / float(longest)
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## Clamp to 1px min: extreme aspect ratios at very small
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## max_resolution could otherwise compute a zero dimension and
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## crash image.resize().
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var new_w := maxi(1, int(original_width * scale))
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var new_h := maxi(1, int(original_height * scale))
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image.resize(new_w, new_h, Image.INTERPOLATE_LANCZOS)
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return {
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"base64": Marshalls.raw_to_base64(image.save_png_to_buffer()),
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"width": image.get_width(),
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"height": image.get_height(),
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"original_width": original_width,
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"original_height": original_height,
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}
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