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https://github.com/opencloud-eu/opencloud.git
synced 2026-11-03 11:04:28 -05:00
Dominik Schmidt
de467d7dd8
A source type maps onto the type its thumbnail is returned in, and that type is asked for by the name the generator knows it under. The answer carries that type whether it was just generated or came from the cache, which is also what the cache key says.
51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
//go:build enable_vips
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package workflow
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import (
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"fmt"
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"image"
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"image/gif"
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vips "github.com/davidbyttow/govips/v2/vips"
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)
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// encodeForUpload turns the value produced by the preprocessing step into
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// bytes for upload to the generator, and says which type they are in.
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func encodeForUpload(v any, mimeType string) ([]byte, string, error) {
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switch data := v.(type) {
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case image.Image:
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img, err := vips.NewImageFromGoImage(data)
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if err != nil {
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return nil, "", fmt.Errorf("create vips image: %w", err)
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}
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defer img.Close()
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if mimeType == "image/jpeg" || mimeType == "image/jpg" {
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buf, _, err := img.ExportJpeg(&vips.JpegExportParams{Quality: 85})
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return buf, "image/jpeg", err
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}
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buf, _, err := img.ExportPng(&vips.PngExportParams{})
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return buf, "image/png", err
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case *gif.GIF:
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if len(data.Image) == 0 {
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return nil, "", fmt.Errorf("gif has no frames")
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}
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img, err := vips.NewImageFromGoImage(data.Image[0])
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if err != nil {
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return nil, "", fmt.Errorf("create vips image: %w", err)
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}
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defer img.Close()
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buf, _, err := img.ExportGIF(&vips.GifExportParams{})
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return buf, "image/gif", err
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default:
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return nil, "", fmt.Errorf("unsupported converted type %T", v)
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}
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}
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