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127 lines
2.9 KiB
Go
127 lines
2.9 KiB
Go
package processing
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import (
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"context"
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"github.com/imgproxy/imgproxy/v3/imagedata"
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"github.com/imgproxy/imgproxy/v3/server"
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"github.com/imgproxy/imgproxy/v3/vips"
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)
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type Context struct {
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// The context to check for timeouts and cancellations
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Ctx context.Context
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// Current image being processed
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Img *vips.Image
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// Processing options this pipeline runs with
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PO ProcessingOptions
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// Original image data
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ImgData imagedata.ImageData
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SrcWidth int
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SrcHeight int
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Angle int
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Flip bool
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CropWidth int
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CropHeight int
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CropGravity GravityOptions
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WScale float64
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HScale float64
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DprScale float64
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// The base shrink factor for vector images.
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// It is used to downscale the input vector image to the maximum allowed resolution
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VectorBaseShrink float64
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// The width we aim to get.
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// Based on the requested width scaled according to processing options.
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// Can be 0 if width is not specified in the processing options.
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TargetWidth int
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// The height we aim to get.
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// Based on the requested height scaled according to processing options.
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// Can be 0 if height is not specified in the processing options.
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TargetHeight int
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// The width of the image after cropping, scaling and rotating
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ScaledWidth int
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// The height of the image after cropping, scaling and rotating
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ScaledHeight int
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// The width of the result crop according to the resizing type
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ResultCropWidth int
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// The height of the result crop according to the resizing type
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ResultCropHeight int
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// The width of the image extended to the requested aspect ratio.
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// Can be 0 if any of the dimensions is not specified in the processing options
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// or if the image already has the requested aspect ratio.
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ExtendAspectRatioWidth int
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// The width of the image extended to the requested aspect ratio.
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// Can be 0 if any of the dimensions is not specified in the processing options
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// or if the image already has the requested aspect ratio.
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ExtendAspectRatioHeight int
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}
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type Step func(c *Context) error
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type Pipeline []Step
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// Run runs the given pipeline with the given parameters
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func (p Pipeline) Run(
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ctx context.Context,
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img *vips.Image,
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po ProcessingOptions,
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imgdata imagedata.ImageData,
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) error {
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pctx := p.newContext(ctx, img, po, imgdata)
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pctx.CalcParams()
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for _, step := range p {
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if err := step(&pctx); err != nil {
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return err
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}
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if err := server.CheckTimeout(ctx); err != nil {
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return err
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}
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}
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img.SetDouble("imgproxy-dpr-scale", pctx.DprScale)
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return nil
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}
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func (p Pipeline) newContext(
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ctx context.Context,
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img *vips.Image,
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po ProcessingOptions,
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imgdata imagedata.ImageData,
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) Context {
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pctx := Context{
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Ctx: ctx,
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Img: img,
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PO: po,
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ImgData: imgdata,
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WScale: 1.0,
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HScale: 1.0,
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DprScale: 1.0,
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VectorBaseShrink: 1.0,
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CropGravity: po.CropGravity(),
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}
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// If crop gravity is not set, use the general gravity option
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if pctx.CropGravity.Type == GravityUnknown {
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pctx.CropGravity = po.Gravity()
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}
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return pctx
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}
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