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Real-image posters: scale to the box's pixel size

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Ghostty shows an image smaller than its placement at its own size, so
library posters (Radarr's poster-500 is 333x500, not 500x750) came out
smaller than the 426x640 remote ones. Images are now scaled (bilinear)
to exactly cols*cellWidth x rows*cellHeight pixels before upload, and
library titles use the original poster for real images. The disk cache
stores posters as decoded (JPEG) instead of the possibly large originals.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
nils
2026-10-24 11:25:45 +02:00
co-authored by Claude Opus 5.5
parent 786e783951
commit 15e97f4582
8 changed files with 100 additions and 25 deletions
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internal/arr/image.go
+11 -9
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@@ -18,8 +18,8 @@ const maxImageBytes = 8 << 20
// function that downloads it, or ok=false when there is none.
//
// Library items have a copy on the Radarr/Sonarr server, which is fetched
// with the API key, preferring a scaled variant: -250 (250×375), or -500
// (500×750) when fetch is asked for a large poster. Titles that are not in
// with the API key: the copy 250 pixels tall (-250), or the original when
// fetch is asked for a large poster. Titles that are not in
// the library yet only have the remote URL of the metadata provider; that is
// fetched without the API key.
func (c *Client) Poster(images []Image, inLibrary bool) (key string, fetch func(ctx context.Context, large bool) ([]byte, error), ok bool) {
@@ -50,10 +50,11 @@ func (c *Client) Poster(images []Image, inLibrary bool) (key string, fetch func(
return "", nil, false
}
// localPoster fetches a poster from the instance: the scaled variant (-500
// when large, else -250), then the original. When the instance answers with a page instead of an image (it
// wants a login for /MediaCover) the API key is also tried as a query
// parameter, which is the other way Radarr and Sonarr accept it.
// localPoster fetches a poster from the instance: the small variant (-250),
// then the original; when large, only the original. When the instance
// answers with a page instead of an image (it wants a login for /MediaCover)
// the API key is also tried as a query parameter, which is the other way
// Radarr and Sonarr accept it.
func (c *Client) localPoster(ctx context.Context, local string, large bool) ([]byte, error) {
try := func(ref string) ([]byte, error) {
data, err := c.GetBytes(ctx, ref)
@@ -65,11 +66,12 @@ func (c *Client) localPoster(ctx context.Context, local string, large bool) ([]b
}
return data, err
}
width := 250
// Radarr/Sonarr keep copies 250 and 500 pixels tall; even the larger one
// is smaller than a real image is shown, so those take the original.
if large {
width = 500
return try(local)
}
if scaled := scaledVariant(local, width); scaled != local {
if scaled := scaledVariant(local, 250); scaled != local {
data, err := try(scaled)
if err == nil {
return data, nil