21593031391

Committed 02 Feb 2026 02:00PM UTC coverage: 91.91% (+0.04%) from 91.871%

Build # 21593031391

Build Type

Pull #720

github

Committed by

cshum

Commit Message

refactor vips process

Pull Request Pull Request #720: refactor: vips process func conslidation

Run Details

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1 existing line in 1 file now uncovered.

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87.85

/processor/vipsprocessor/process.go

package vipsprocessor

import (
        "context"
        "math"
        "strconv"
        "strings"
        "time"

        "github.com/cshum/imagor"
        "github.com/cshum/imagor/imagorpath"
        "github.com/cshum/vipsgen/vips"
        "go.uber.org/zap"
)

var imageTypeMap = map[string]vips.ImageType{
        "gif":  vips.ImageTypeGif,
        "jpeg": vips.ImageTypeJpeg,
        "jpg":  vips.ImageTypeJpeg,
        "pdf":  vips.ImageTypePdf,
        "png":  vips.ImageTypePng,
        "svg":  vips.ImageTypeSvg,
        "tiff": vips.ImageTypeTiff,
        "webp": vips.ImageTypeWebp,
        "heif": vips.ImageTypeHeif,
        "bmp":  vips.ImageTypeBmp,
        "avif": vips.ImageTypeAvif,
        "jp2":  vips.ImageTypeJp2k,
        "jxl":  vips.ImageTypeJxl,
}

// IsAnimationSupported indicates if image type supports animation
func IsAnimationSupported(imageType vips.ImageType) bool {
        return imageType == vips.ImageTypeGif || imageType == vips.ImageTypeWebp
}

// exportParams holds parameters needed for image export
type exportParams struct {
        format        vips.ImageType
        quality       int
        compression   int
        bitdepth      int
        palette       bool
        stripMetadata bool
        maxBytes      int
}

// Process implements imagor.Processor interface
func (v *Processor) Process(
        ctx context.Context, blob *imagor.Blob, p imagorpath.Params, load imagor.LoadFunc,
) (*imagor.Blob, error) {
        ctx = withContext(ctx)
        defer contextDone(ctx)

        // Load and process the image
        img, err := v.loadAndProcess(ctx, blob, p, load)
        if err != nil {
                return nil, err
        }
        defer img.Close()

        // Extract export parameters
        params := v.extractExportParams(p, blob, img)

        // Handle metadata response
        if p.Meta {
                stripExif := false
                for _, f := range p.Filters {
                        if f.Name == "strip_exif" {
                                stripExif = true
                                break
                        }
                }
                return imagor.NewBlobFromJsonMarshal(metadata(img, params.format, stripExif)), nil
        }

        // Export with max_bytes retry loop
        params.format = supportedSaveFormat(params.format)
        for {
                buf, err := v.export(img, params.format, params.compression, params.quality, params.palette, params.bitdepth, params.stripMetadata)
                if err != nil {
                        return nil, WrapErr(err)
                }
                if params.maxBytes > 0 && (params.quality > 10 || params.quality == 0) && params.format != vips.ImageTypePng {
                        ln := len(buf)
                        if v.Debug {
                                v.Logger.Debug("max_bytes",
                                        zap.Int("bytes", ln),
                                        zap.Int("quality", params.quality),
                                )
                        }
                        if ln > params.maxBytes {
                                if params.quality == 0 {
                                        params.quality = 80
                                }
                                delta := float64(ln) / float64(params.maxBytes)
                                switch {
                                case delta > 3:
                                        params.quality = params.quality * 25 / 100
                                case delta > 1.5:
                                        params.quality = params.quality * 50 / 100
                                default:
                                        params.quality = params.quality * 75 / 100
                                }
                                if err := ctx.Err(); err != nil {
                                        return nil, WrapErr(err)
                                }
                                continue
                        }
                }
                blob := imagor.NewBlobFromBytes(buf)
                if typ, ok := params.format.MimeType(); ok {
                        blob.SetContentType(typ)
                }
                return blob, nil
        }
}

// extractExportParams extracts export-related parameters from filters
func (v *Processor) extractExportParams(p imagorpath.Params, blob *imagor.Blob, img *vips.Image) *exportParams {
        var (
                quality       int
                bitdepth      int
                compression   int
                palette       bool
                stripMetadata = v.StripMetadata
                maxBytes      int
                format        = vips.ImageTypeUnknown
        )

        // Extract export parameters from filters
        for _, f := range p.Filters {
                if v.disableFilters[f.Name] {
                        continue
                }
                switch f.Name {
                case "format":
                        if imageType, ok := imageTypeMap[f.Args]; ok {
                                format = supportedSaveFormat(imageType)
                        }
                case "quality":
                        quality, _ = strconv.Atoi(f.Args)
                case "autojpg":
                        format = vips.ImageTypeJpeg
                case "palette":
                        palette = true
                case "bitdepth":
                        bitdepth, _ = strconv.Atoi(f.Args)
                case "compression":
                        compression, _ = strconv.Atoi(f.Args)
                case "max_bytes":
                        if n, _ := strconv.Atoi(f.Args); n > 0 {
                                maxBytes = n
                        }
                case "strip_metadata":
                        stripMetadata = true
                }
        }

        // Determine format if not specified
        if format == vips.ImageTypeUnknown {
                if blob.BlobType() == imagor.BlobTypeAVIF {
                        format = vips.ImageTypeAvif
                } else {
                        format = img.Format()
                }
        }

        return &exportParams{
                format:        format,
                quality:       quality,
                compression:   compression,
                bitdepth:      bitdepth,
                palette:       palette,
                stripMetadata: stripMetadata,
                maxBytes:      maxBytes,
        }
}

// loadAndProcess loads the image from blob and applies all transformations
func (v *Processor) loadAndProcess(
        ctx context.Context, blob *imagor.Blob, p imagorpath.Params, load imagor.LoadFunc,
) (*vips.Image, error) {
        var (
                thumbnailNotSupported bool
                upscale               = true
                stretch               = p.Stretch
                thumbnail             = false
                orient                int
                img                   *vips.Image
                maxN                  = v.MaxAnimationFrames
                page                  = 1
                dpi                   = 0
                err                   error
        )
        if p.Trim || p.VFlip {
                thumbnailNotSupported = true
        }
        if p.FitIn {
                upscale = false
        }
        if maxN == 0 || maxN < -1 {
                maxN = 1
        }
        if blob != nil && !blob.SupportsAnimation() {
                maxN = 1
        }
        for _, f := range p.Filters {
                if v.disableFilters[f.Name] {
                        continue
                }
                switch f.Name {
                case "format":
                        if imageType, ok := imageTypeMap[f.Args]; ok {
                                format := supportedSaveFormat(imageType)
                                if !IsAnimationSupported(format) {
                                        // no frames if export format not support animation
                                        maxN = 1
                                }
                        }
                case "max_frames":
                        if n, _ := strconv.Atoi(f.Args); n > 0 && (maxN == -1 || n < maxN) {
                                maxN = n
                        }
                case "stretch":
                        stretch = true
                case "upscale":
                        upscale = true
                case "no_upscale":
                        upscale = false
                case "fill", "background_color":
                        if args := strings.Split(f.Args, ","); args[0] == "auto" {
                                thumbnailNotSupported = true
                        }
                case "page":
                        if n, _ := strconv.Atoi(f.Args); n > 0 {
                                page = n
                        }
                case "dpi":
                        if n, _ := strconv.Atoi(f.Args); n > 0 {
                                dpi = n
                        }
                case "orient":
                        if n, _ := strconv.Atoi(f.Args); n > 0 {
                                orient = n
                                thumbnailNotSupported = true
                        }
                case "max_bytes":
                        if n, _ := strconv.Atoi(f.Args); n > 0 {
                                thumbnailNotSupported = true
                        }
                case "trim", "focal", "rotate":
                        thumbnailNotSupported = true
                }
        }

        if !thumbnailNotSupported &&
                p.CropBottom == 0.0 && p.CropTop == 0.0 && p.CropLeft == 0.0 && p.CropRight == 0.0 {
                // apply shrink-on-load where possible
                if p.FitIn {
                        if p.Width > 0 || p.Height > 0 {
                                w := p.Width
                                h := p.Height
                                if w == 0 {
                                        w = v.MaxWidth
                                }
                                if h == 0 {
                                        h = v.MaxHeight
                                }
                                size := vips.SizeDown
                                if upscale {
                                        size = vips.SizeBoth
                                }
                                if img, err = v.NewThumbnail(
                                        ctx, blob, w, h, vips.InterestingNone, size, maxN, page, dpi,
                                ); err != nil {
                                        return nil, err
                                }
                                thumbnail = true
                        }
                } else if stretch {
                        if p.Width > 0 && p.Height > 0 {
                                if img, err = v.NewThumbnail(
                                        ctx, blob, p.Width, p.Height,
                                        vips.InterestingNone, vips.SizeForce, maxN, page, dpi,
                                ); err != nil {
                                        return nil, err
                                }
                                thumbnail = true
                        }
                } else {
                        if p.Width > 0 && p.Height > 0 {
                                interest := vips.InterestingNone
                                if p.Smart {
                                        interest = vips.InterestingAttention
                                        thumbnail = true
                                } else if (p.VAlign == imagorpath.VAlignTop && p.HAlign == "") ||
                                        (p.HAlign == imagorpath.HAlignLeft && p.VAlign == "") {
                                        interest = vips.InterestingLow
                                        thumbnail = true
                                } else if (p.VAlign == imagorpath.VAlignBottom && p.HAlign == "") ||
                                        (p.HAlign == imagorpath.HAlignRight && p.VAlign == "") {
                                        interest = vips.InterestingHigh
                                        thumbnail = true
                                } else if (p.VAlign == "" || p.VAlign == "middle") &&
                                        (p.HAlign == "" || p.HAlign == "center") {
                                        interest = vips.InterestingCentre
                                        thumbnail = true
                                }
                                if thumbnail {
                                        if img, err = v.NewThumbnail(
                                                ctx, blob, p.Width, p.Height,
                                                interest, vips.SizeBoth, maxN, page, dpi,
                                        ); err != nil {
                                                return nil, err
                                        }
                                }
                        } else if p.Width > 0 && p.Height == 0 {
                                if img, err = v.NewThumbnail(
                                        ctx, blob, p.Width, v.MaxHeight,
                                        vips.InterestingNone, vips.SizeBoth, maxN, page, dpi,
                                ); err != nil {
                                        return nil, err
                                }
                                thumbnail = true
                        } else if p.Height > 0 && p.Width == 0 {
                                if img, err = v.NewThumbnail(
                                        ctx, blob, v.MaxWidth, p.Height,
                                        vips.InterestingNone, vips.SizeBoth, maxN, page, dpi,
                                ); err != nil {
                                        return nil, err
                                }
                                thumbnail = true
                        }
                }
        }
        if !thumbnail {
                if thumbnailNotSupported {
                        if img, err = v.NewImage(ctx, blob, maxN, page, dpi); err != nil {
                                return nil, err
                        }
                } else {
                        if img, err = v.NewThumbnail(
                                ctx, blob, v.MaxWidth, v.MaxHeight,
                                vips.InterestingNone, vips.SizeDown, maxN, page, dpi,
                        ); err != nil {
                                return nil, err
                        }
                }
        }

        if orient > 0 {
                // orient rotate before resize
                if err = img.RotMultiPage(getAngle(orient)); err != nil {
                        return nil, err
                }
        }

        var (
                origWidth  = float64(img.Width())
                origHeight = float64(img.PageHeight())
        )
        if v.Debug {
                v.Logger.Debug("image",
                        zap.Int("width", img.Width()),
                        zap.Int("height", img.Height()),
                        zap.Int("page_height", img.PageHeight()))
        }

        // Extract focal points for transformation
        var focalRects []focal
        for _, f := range p.Filters {
                if v.disableFilters[f.Name] {
                        continue
                }
                if f.Name == "focal" {
                        args := strings.FieldsFunc(f.Args, argSplit)
                        switch len(args) {
                        case 4:
                                rect := focal{}
                                rect.Left, _ = strconv.ParseFloat(args[0], 64)
                                rect.Top, _ = strconv.ParseFloat(args[1], 64)
                                rect.Right, _ = strconv.ParseFloat(args[2], 64)
                                rect.Bottom, _ = strconv.ParseFloat(args[3], 64)
                                if rect.Left < 1 && rect.Top < 1 && rect.Right <= 1 && rect.Bottom <= 1 {
                                        rect.Left *= origWidth
                                        rect.Right *= origWidth
                                        rect.Top *= origHeight
                                        rect.Bottom *= origHeight
                                }
                                if rect.Right > rect.Left && rect.Bottom > rect.Top {
                                        focalRects = append(focalRects, rect)
                                }
                        case 2:
                                rect := focal{}
                                rect.Left, _ = strconv.ParseFloat(args[0], 64)
                                rect.Top, _ = strconv.ParseFloat(args[1], 64)
                                if rect.Left < 1 && rect.Top < 1 {
                                        rect.Left *= origWidth
                                        rect.Top *= origHeight
                                }
                                rect.Right = rect.Left + 1
                                rect.Bottom = rect.Top + 1
                                focalRects = append(focalRects, rect)
                        }
                }
        }
        // Apply transformations
        if err := v.applyTransformations(ctx, img, p, load, thumbnail, stretch, upscale, focalRects); err != nil {
                return nil, WrapErr(err)
        }

        return img, nil
}

// applyTransformations applies all image transformations (crop, resize, flip, filters)
func (v *Processor) applyTransformations(
        ctx context.Context, img *vips.Image, p imagorpath.Params, load imagor.LoadFunc, thumbnail, stretch, upscale bool, focalRects []focal,
) error {
        var (
                origWidth  = float64(img.Width())
                origHeight = float64(img.PageHeight())
                cropLeft,
                cropTop,
                cropRight,
                cropBottom float64
        )
        if p.CropRight > 0 || p.CropLeft > 0 || p.CropBottom > 0 || p.CropTop > 0 {
                // percentage
                cropLeft = math.Max(p.CropLeft, 0)
                cropTop = math.Max(p.CropTop, 0)
                cropRight = p.CropRight
                cropBottom = p.CropBottom
                if p.CropLeft < 1 && p.CropTop < 1 && p.CropRight <= 1 && p.CropBottom <= 1 {
                        cropLeft = math.Round(cropLeft * origWidth)
                        cropTop = math.Round(cropTop * origHeight)
                        cropRight = math.Round(cropRight * origWidth)
                        cropBottom = math.Round(cropBottom * origHeight)
                }
                if cropRight == 0 {
                        cropRight = origWidth - 1
                }
                if cropBottom == 0 {
                        cropBottom = origHeight - 1
                }
                cropRight = math.Min(cropRight, origWidth-1)
                cropBottom = math.Min(cropBottom, origHeight-1)
        }
        if p.Trim {
                if l, t, w, h, err := findTrim(ctx, img, p.TrimBy, p.TrimTolerance); err == nil {
                        cropLeft = math.Max(cropLeft, float64(l))
                        cropTop = math.Max(cropTop, float64(t))
                        if cropRight > 0 {
                                cropRight = math.Min(cropRight, float64(l+w))
                        } else {
                                cropRight = float64(l + w)
                        }
                        if cropBottom > 0 {
                                cropBottom = math.Min(cropBottom, float64(t+h))
                        } else {
                                cropBottom = float64(t + h)
                        }
                }
        }
        if cropRight > cropLeft && cropBottom > cropTop {
                if err := img.ExtractAreaMultiPage(
                        int(cropLeft), int(cropTop), int(cropRight-cropLeft), int(cropBottom-cropTop),
                ); err != nil {
                        return err
                }
        }
        var (
                w = p.Width
                h = p.Height
        )
        if w == 0 && h == 0 {
                w = img.Width()
                h = img.PageHeight()
        } else if w == 0 {
                w = img.Width() * h / img.PageHeight()
                if !upscale && w > img.Width() {
                        w = img.Width()
                }
        } else if h == 0 {
                h = img.PageHeight() * w / img.Width()
                if !upscale && h > img.PageHeight() {
                        h = img.PageHeight()
                }
        }
        if !thumbnail {
                if p.FitIn {
                        if upscale || w < img.Width() || h < img.PageHeight() {
                                if err := img.ThumbnailImage(w, &vips.ThumbnailImageOptions{Height: h, Crop: vips.InterestingNone}); err != nil {
                                        return err
                                }
                        }
                } else if stretch {
                        if upscale || (w < img.Width() && h < img.PageHeight()) {
                                if err := img.ThumbnailImage(
                                        w, &vips.ThumbnailImageOptions{Height: h, Crop: vips.InterestingNone, Size: vips.SizeForce},
                                ); err != nil {
                                        return err
                                }
                        }
                } else if upscale || w < img.Width() || h < img.PageHeight() {
                        interest := vips.InterestingCentre
                        if p.Smart {
                                interest = vips.InterestingAttention
                        } else if float64(w)/float64(h) > float64(img.Width())/float64(img.PageHeight()) {
                                if p.VAlign == imagorpath.VAlignTop {
                                        interest = vips.InterestingLow
                                } else if p.VAlign == imagorpath.VAlignBottom {
                                        interest = vips.InterestingHigh
                                }
                        } else {
                                if p.HAlign == imagorpath.HAlignLeft {
                                        interest = vips.InterestingLow
                                } else if p.HAlign == imagorpath.HAlignRight {
                                        interest = vips.InterestingHigh
                                }
                        }
                        if len(focalRects) > 0 {
                                focalX, focalY := parseFocalPoint(focalRects...)
                                if err := v.FocalThumbnail(
                                        img, w, h,
                                        (focalX-cropLeft)/float64(img.Width()),
                                        (focalY-cropTop)/float64(img.PageHeight()),
                                ); err != nil {
                                        return err
                                }
                        } else {
                                if err := v.Thumbnail(img, w, h, interest, vips.SizeBoth); err != nil {
                                        return err
                                }
                        }
                        if _, err := v.CheckResolution(img, nil); err != nil {
                                return err
                        }
                }
        }
        if p.HFlip {
                if err := img.Flip(vips.DirectionHorizontal); err != nil {
                        return err
                }
        }
        if p.VFlip {
                if err := img.Flip(vips.DirectionVertical); err != nil {
                        return err
                }
        }
        for i, filter := range p.Filters {
                if err := ctx.Err(); err != nil {
                        return err
                }
                if v.disableFilters[filter.Name] {
                        continue
                }
                if v.MaxFilterOps > 0 && i >= v.MaxFilterOps {
                        if v.Debug {
                                v.Logger.Debug("max-filter-ops-exceeded",
                                        zap.String("name", filter.Name), zap.String("args", filter.Args))
                        }
                        break
                }
                start := time.Now()
                var args []string
                if filter.Args != "" {
                        args = strings.Split(filter.Args, ",")
                }
                if fn := v.Filters[filter.Name]; fn != nil {
                        if err := fn(ctx, img, load, args...); err != nil {
                                return err
                        }
                } else if filter.Name == "fill" {
                        if err := v.fill(ctx, img, w, h,
                                p.PaddingLeft, p.PaddingTop, p.PaddingRight, p.PaddingBottom,
                                filter.Args); err != nil {
                                return err
                        }
                }
                if v.Debug {
                        v.Logger.Debug("filter",
                                zap.String("name", filter.Name), zap.String("args", filter.Args),
                                zap.Duration("took", time.Since(start)))
                }
        }
        return nil
}

// Metadata image attributes
type Metadata struct {
        Format      string            `json:"format"`
        ContentType string            `json:"content_type"`
        Width       int               `json:"width"`
        Height      int               `json:"height"`
        Orientation int               `json:"orientation"`
        Pages       int               `json:"pages"`
        Bands       int               `json:"bands"`
        Exif        map[string]string `json:"exif"`
}

func metadata(img *vips.Image, format vips.ImageType, stripExif bool) *Metadata {
        pages := 1
        if IsAnimationSupported(format) {
                pages = img.Height() / img.PageHeight()
        }
        if format == vips.ImageTypePdf {
                pages = img.Pages()
        }
        exif := map[string]string{}
        if !stripExif {
                exif = extractExif(img.Exif())
        }
        mimeType, _ := format.MimeType()
        return &Metadata{
                Format:      string(format),
                ContentType: mimeType,
                Width:       img.Width(),
                Height:      img.PageHeight(),
                Pages:       pages,
                Bands:       img.Bands(),
                Orientation: img.Orientation(),
                Exif:        exif,
        }
}

func supportedSaveFormat(format vips.ImageType) vips.ImageType {
        switch format {
        case vips.ImageTypePng, vips.ImageTypeWebp, vips.ImageTypeTiff, vips.ImageTypeGif, vips.ImageTypeAvif, vips.ImageTypeHeif, vips.ImageTypeJp2k, vips.ImageTypeJxl:
                return format
        }
        return vips.ImageTypeJpeg
}

func (v *Processor) export(
        image *vips.Image, format vips.ImageType, compression int, quality int, palette bool, bitdepth int, stripMetadata bool,
) ([]byte, error) {
        // check resolution before export
        if _, err := v.CheckResolution(image, nil); err != nil {
                return nil, err
        }
        switch format {
        case vips.ImageTypePng:
                opts := &vips.PngsaveBufferOptions{
                        Q:           quality,
                        Palette:     palette,
                        Bitdepth:    bitdepth,
                        Compression: compression,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.PngsaveBuffer(opts)
        case vips.ImageTypeWebp:
                opts := &vips.WebpsaveBufferOptions{
                        Q: quality,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.WebpsaveBuffer(opts)
        case vips.ImageTypeJxl:
                opts := &vips.JxlsaveBufferOptions{
                        Q: quality,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.JxlsaveBuffer(opts)
        case vips.ImageTypeTiff:
                opts := &vips.TiffsaveBufferOptions{
                        Q: quality,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.TiffsaveBuffer(opts)
        case vips.ImageTypeGif:
                opts := &vips.GifsaveBufferOptions{}
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.GifsaveBuffer(opts)
        case vips.ImageTypeAvif:
                opts := &vips.HeifsaveBufferOptions{
                        Q:           quality,
                        Compression: vips.HeifCompressionAv1,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                opts.Effort = 9 - v.AvifSpeed
                return image.HeifsaveBuffer(opts)
        case vips.ImageTypeHeif:
                opts := &vips.HeifsaveBufferOptions{
                        Q: quality,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.HeifsaveBuffer(opts)
        case vips.ImageTypeJp2k:
                opts := &vips.Jp2ksaveBufferOptions{
                        Q: quality,
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.Jp2ksaveBuffer(opts)
        default:
                opts := &vips.JpegsaveBufferOptions{}
                if v.MozJPEG {
                        opts.Q = 75
                        opts.Keep = vips.KeepNone
                        opts.OptimizeCoding = true
                        opts.Interlace = true
                        opts.OptimizeScans = true
                        opts.TrellisQuant = true
                        opts.QuantTable = 3
                }
                if quality > 0 {
                        opts.Q = quality
                }
                if stripMetadata {
                        opts.Keep = vips.KeepNone
                }
                return image.JpegsaveBuffer(opts)
        }
}

func argSplit(r rune) bool {
        return r == 'x' || r == ',' || r == ':'
}

type focal struct {
        Left   float64
        Right  float64
        Top    float64
        Bottom float64
}

func parseFocalPoint(focalRects ...focal) (focalX, focalY float64) {
        var sumWeight float64
        for _, f := range focalRects {
                sumWeight += (f.Right - f.Left) * (f.Bottom - f.Top)
        }
        for _, f := range focalRects {
                r := (f.Right - f.Left) * (f.Bottom - f.Top) / sumWeight
                focalX += (f.Left + f.Right) / 2 * r
                focalY += (f.Top + f.Bottom) / 2 * r
        }
        return
}

func findTrim(
        _ context.Context, img *vips.Image, pos string, tolerance int,
) (l, t, w, h int, err error) {
        if isAnimated(img) {
                // skip animation support
                return
        }
        tmp, err := img.Copy(&vips.CopyOptions{Interpretation: vips.InterpretationSrgb})
        if err != nil {
                return
        }
        defer tmp.Close()
        if tmp.HasAlpha() {
                if err = tmp.Flatten(&vips.FlattenOptions{Background: []float64{255, 0, 255}}); err != nil {
                        return
                }
        }
        var x, y int
        if pos == imagorpath.TrimByBottomRight {
                x = tmp.Width() - 1
                y = tmp.PageHeight() - 1
        }
        if tolerance == 0 {
                tolerance = 1
        }
        background, err := tmp.Getpoint(x, y, nil)
        if err != nil {
                return
        }
        l, t, w, h, err = tmp.FindTrim(&vips.FindTrimOptions{
                Threshold:  float64(tolerance),
                Background: background,
        })
        return
}

cshum / imagor / 21593031391

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