mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-27 22:11:19 +00:00
360 lines
9.5 KiB
Go
360 lines
9.5 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package images
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import (
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"errors"
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"fmt"
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"image/color"
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"strconv"
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"strings"
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"github.com/disintegration/gift"
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"github.com/mitchellh/mapstructure"
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)
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const (
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defaultJPEGQuality = 75
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defaultResampleFilter = "box"
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defaultBgColor = "ffffff"
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)
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var (
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imageFormats = map[string]Format{
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".jpg": JPEG,
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".jpeg": JPEG,
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".png": PNG,
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".tif": TIFF,
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".tiff": TIFF,
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".bmp": BMP,
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".gif": GIF,
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}
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// Add or increment if changes to an image format's processing requires
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// re-generation.
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imageFormatsVersions = map[Format]int{
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PNG: 2, // Floyd Steinberg dithering
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}
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// Increment to mark all processed images as stale. Only use when absolutely needed.
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// See the finer grained smartCropVersionNumber and imageFormatsVersions.
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mainImageVersionNumber = 0
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)
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var anchorPositions = map[string]gift.Anchor{
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strings.ToLower("Center"): gift.CenterAnchor,
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strings.ToLower("TopLeft"): gift.TopLeftAnchor,
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strings.ToLower("Top"): gift.TopAnchor,
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strings.ToLower("TopRight"): gift.TopRightAnchor,
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strings.ToLower("Left"): gift.LeftAnchor,
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strings.ToLower("Right"): gift.RightAnchor,
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strings.ToLower("BottomLeft"): gift.BottomLeftAnchor,
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strings.ToLower("Bottom"): gift.BottomAnchor,
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strings.ToLower("BottomRight"): gift.BottomRightAnchor,
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}
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var imageFilters = map[string]gift.Resampling{
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strings.ToLower("NearestNeighbor"): gift.NearestNeighborResampling,
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strings.ToLower("Box"): gift.BoxResampling,
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strings.ToLower("Linear"): gift.LinearResampling,
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strings.ToLower("Hermite"): hermiteResampling,
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strings.ToLower("MitchellNetravali"): mitchellNetravaliResampling,
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strings.ToLower("CatmullRom"): catmullRomResampling,
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strings.ToLower("BSpline"): bSplineResampling,
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strings.ToLower("Gaussian"): gaussianResampling,
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strings.ToLower("Lanczos"): gift.LanczosResampling,
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strings.ToLower("Hann"): hannResampling,
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strings.ToLower("Hamming"): hammingResampling,
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strings.ToLower("Blackman"): blackmanResampling,
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strings.ToLower("Bartlett"): bartlettResampling,
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strings.ToLower("Welch"): welchResampling,
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strings.ToLower("Cosine"): cosineResampling,
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}
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func ImageFormatFromExt(ext string) (Format, bool) {
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f, found := imageFormats[ext]
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return f, found
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}
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func DecodeConfig(m map[string]interface{}) (ImagingConfig, error) {
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var i Imaging
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var ic ImagingConfig
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if err := mapstructure.WeakDecode(m, &i); err != nil {
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return ic, err
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}
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if i.Quality == 0 {
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i.Quality = defaultJPEGQuality
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} else if i.Quality < 0 || i.Quality > 100 {
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return ic, errors.New("JPEG quality must be a number between 1 and 100")
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}
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if i.BgColor != "" {
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i.BgColor = strings.TrimPrefix(i.BgColor, "#")
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} else {
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i.BgColor = defaultBgColor
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}
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var err error
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ic.BgColor, err = hexStringToColor(i.BgColor)
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if err != nil {
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return ic, err
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}
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if i.Anchor == "" || strings.EqualFold(i.Anchor, smartCropIdentifier) {
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i.Anchor = smartCropIdentifier
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} else {
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i.Anchor = strings.ToLower(i.Anchor)
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if _, found := anchorPositions[i.Anchor]; !found {
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return ic, errors.New("invalid anchor value in imaging config")
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}
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}
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if i.ResampleFilter == "" {
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i.ResampleFilter = defaultResampleFilter
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} else {
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filter := strings.ToLower(i.ResampleFilter)
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_, found := imageFilters[filter]
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if !found {
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return ic, fmt.Errorf("%q is not a valid resample filter", filter)
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}
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i.ResampleFilter = filter
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}
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if strings.TrimSpace(i.Exif.IncludeFields) == "" && strings.TrimSpace(i.Exif.ExcludeFields) == "" {
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// Don't change this for no good reason. Please don't.
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i.Exif.ExcludeFields = "GPS|Exif|Exposure[M|P|B]|Contrast|Resolution|Sharp|JPEG|Metering|Sensing|Saturation|ColorSpace|Flash|WhiteBalance"
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}
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ic.Cfg = i
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return ic, nil
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}
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func DecodeImageConfig(action, config string, defaults Imaging) (ImageConfig, error) {
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var (
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c ImageConfig
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err error
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)
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c.Action = action
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if config == "" {
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return c, errors.New("image config cannot be empty")
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}
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parts := strings.Fields(config)
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for _, part := range parts {
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part = strings.ToLower(part)
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if part == smartCropIdentifier {
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c.AnchorStr = smartCropIdentifier
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} else if pos, ok := anchorPositions[part]; ok {
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c.Anchor = pos
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c.AnchorStr = part
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} else if filter, ok := imageFilters[part]; ok {
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c.Filter = filter
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c.FilterStr = part
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} else if part[0] == '#' {
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c.BgColorStr = part[1:]
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c.BgColor, err = hexStringToColor(c.BgColorStr)
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if err != nil {
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return c, err
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}
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} else if part[0] == 'q' {
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c.Quality, err = strconv.Atoi(part[1:])
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if err != nil {
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return c, err
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}
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if c.Quality < 1 || c.Quality > 100 {
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return c, errors.New("quality ranges from 1 to 100 inclusive")
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}
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} else if part[0] == 'r' {
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c.Rotate, err = strconv.Atoi(part[1:])
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if err != nil {
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return c, err
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}
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} else if strings.Contains(part, "x") {
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widthHeight := strings.Split(part, "x")
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if len(widthHeight) <= 2 {
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first := widthHeight[0]
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if first != "" {
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c.Width, err = strconv.Atoi(first)
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if err != nil {
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return c, err
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}
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}
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if len(widthHeight) == 2 {
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second := widthHeight[1]
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if second != "" {
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c.Height, err = strconv.Atoi(second)
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if err != nil {
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return c, err
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}
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}
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}
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} else {
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return c, errors.New("invalid image dimensions")
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}
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} else if f, ok := ImageFormatFromExt("." + part); ok {
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c.TargetFormat = f
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}
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}
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if c.Width == 0 && c.Height == 0 {
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return c, errors.New("must provide Width or Height")
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}
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if c.FilterStr == "" {
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c.FilterStr = defaults.ResampleFilter
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c.Filter = imageFilters[c.FilterStr]
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}
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if c.AnchorStr == "" {
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c.AnchorStr = defaults.Anchor
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if !strings.EqualFold(c.AnchorStr, smartCropIdentifier) {
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c.Anchor = anchorPositions[c.AnchorStr]
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}
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}
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return c, nil
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}
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// ImageConfig holds configuration to create a new image from an existing one, resize etc.
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type ImageConfig struct {
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// This defines the output format of the output image. It defaults to the source format
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TargetFormat Format
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Action string
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// If set, this will be used as the key in filenames etc.
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Key string
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// Quality ranges from 1 to 100 inclusive, higher is better.
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// This is only relevant for JPEG images.
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// Default is 75.
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Quality int
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// Rotate rotates an image by the given angle counter-clockwise.
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// The rotation will be performed first.
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Rotate int
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// Used to fill any transparency.
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// When set in site config, it's used when converting to a format that does
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// not support transparency.
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// When set per image operation, it's used even for formats that does support
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// transparency.
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BgColor color.Color
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BgColorStr string
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Width int
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Height int
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Filter gift.Resampling
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FilterStr string
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Anchor gift.Anchor
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AnchorStr string
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}
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func (i ImageConfig) GetKey(format Format) string {
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if i.Key != "" {
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return i.Action + "_" + i.Key
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}
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k := strconv.Itoa(i.Width) + "x" + strconv.Itoa(i.Height)
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if i.Action != "" {
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k += "_" + i.Action
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}
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if i.Quality > 0 {
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k += "_q" + strconv.Itoa(i.Quality)
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}
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if i.Rotate != 0 {
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k += "_r" + strconv.Itoa(i.Rotate)
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}
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if i.BgColorStr != "" {
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k += "_bg" + i.BgColorStr
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}
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anchor := i.AnchorStr
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if anchor == smartCropIdentifier {
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anchor = anchor + strconv.Itoa(smartCropVersionNumber)
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}
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k += "_" + i.FilterStr
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if strings.EqualFold(i.Action, "fill") {
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k += "_" + anchor
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}
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if v, ok := imageFormatsVersions[format]; ok {
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k += "_" + strconv.Itoa(v)
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}
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if mainImageVersionNumber > 0 {
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k += "_" + strconv.Itoa(mainImageVersionNumber)
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}
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return k
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}
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type ImagingConfig struct {
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BgColor color.Color
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// Config as provided by the user.
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Cfg Imaging
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}
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// Imaging contains default image processing configuration. This will be fetched
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// from site (or language) config.
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type Imaging struct {
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// Default image quality setting (1-100). Only used for JPEG images.
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Quality int
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// Resample filter to use in resize operations..
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ResampleFilter string
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// The anchor to use in Fill. Default is "smart", i.e. Smart Crop.
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Anchor string
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// Default color used in fill operations (e.g. "fff" for white).
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BgColor string
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Exif ExifConfig
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}
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type ExifConfig struct {
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// Regexp matching the Exif fields you want from the (massive) set of Exif info
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// available. As we cache this info to disk, this is for performance and
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// disk space reasons more than anything.
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// If you want it all, put ".*" in this config setting.
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// Note that if neither this or ExcludeFields is set, Hugo will return a small
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// default set.
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IncludeFields string
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// Regexp matching the Exif fields you want to exclude. This may be easier to use
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// than IncludeFields above, depending on what you want.
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ExcludeFields string
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// Hugo extracts the "photo taken" date/time into .Date by default.
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// Set this to true to turn it off.
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DisableDate bool
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// Hugo extracts the "photo taken where" (GPS latitude and longitude) into
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// .Long and .Lat. Set this to true to turn it off.
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DisableLatLong bool
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}
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