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316cde2569
* Remove disintegration/imaging dependency * Simplify FillCenter logic --------- Co-authored-by: Mattermost Build <build@mattermost.com>
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package imaging
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import (
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"bytes"
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"fmt"
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"image"
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"image/jpeg"
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"github.com/anthonynsimon/bild/transform"
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)
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// GeneratePreview generates the preview for the given image.
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func GeneratePreview(img image.Image, width int) image.Image {
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preview := img
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w := img.Bounds().Dx()
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if w > width {
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preview = Resize(img, width, 0, transform.Lanczos)
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}
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return preview
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}
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// GenerateThumbnail generates the thumbnail for the given image.
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func GenerateThumbnail(img image.Image, targetWidth, targetHeight int) image.Image {
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width := img.Bounds().Dx()
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height := img.Bounds().Dy()
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// We keep aspect ratio and ensure the output dimensions are never higher than the provided targets.
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if width > height {
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return Resize(img, targetWidth, 0, transform.Lanczos)
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}
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return Resize(img, 0, targetHeight, transform.Lanczos)
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}
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// GenerateMiniPreviewImage generates the mini preview for the given image.
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func GenerateMiniPreviewImage(img image.Image, w, h, q int) ([]byte, error) {
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var buf bytes.Buffer
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preview := Resize(img, w, h, transform.Lanczos)
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if err := jpeg.Encode(&buf, preview, &jpeg.Options{Quality: q}); err != nil {
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return nil, fmt.Errorf("failed to encode image to JPEG format: %w", err)
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}
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return buf.Bytes(), nil
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}
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