| """The prompts, and the color ground truth. |
| |
| The font ground truths ship as rendered images under ``references/`` -- one |
| PIL render of the case's word in its pinned font file (provenance per case in |
| ``data/fonts.jsonl``: google/fonts commit, file path, sha256). The color |
| ground truth is defined here: a solid rectangle on white, which scores exactly |
| zero through the color metric. |
| """ |
|
|
| from __future__ import annotations |
|
|
| from PIL import Image, ImageDraw |
|
|
| from .cases import FontCase |
|
|
| CANVAS = 1024 |
|
|
| FONT_PROMPT_TEMPLATE = ( |
| 'A plain white image. The word "{word}" in solid black, centered, in the ' |
| "font {family} {variant}. Nothing else in the image." |
| ) |
|
|
| COLOR_PROMPT_TEMPLATE = ( |
| "A plain white (#FFFFFF) image with a single solid rectangle of {hex} in " |
| "the middle. No border, no shadow, no texture, no gradient." |
| ) |
|
|
| RECT_FRACTION = 0.5 |
|
|
|
|
| def font_prompt(case: FontCase) -> str: |
| return FONT_PROMPT_TEMPLATE.format( |
| family=case.family, variant=case.variant, word=case.word |
| ) |
|
|
|
|
| def color_prompt(hex_color: str) -> str: |
| return COLOR_PROMPT_TEMPLATE.format(hex=hex_color.upper()) |
|
|
|
|
| def render_color_reference(hex_color: str, canvas: int = CANVAS) -> Image.Image: |
| image = Image.new("RGB", (canvas, canvas), "#FFFFFF") |
| side = round(canvas * RECT_FRACTION) |
| corner = (canvas - side) // 2 |
| ImageDraw.Draw(image).rectangle( |
| (corner, corner, corner + side, corner + side), fill=hex_color |
| ) |
| return image |
|
|
