Package optimize

type Chain ¶

Chain allows to use sequence of optimizers. It implements interface model.Optimizer.

type Chain struct {
    // contains filtered or unexported fields
}

func New ¶

func New(options Options) *Chain

New creates a optimizers chain from options.

func (*Chain) Append ¶

func (c *Chain) Append(optimizers ...model.Optimizer)

Append appends optimizers to the chain.

func (*Chain) GetOptimizers ¶

func (c *Chain) GetOptimizers() []model.Optimizer

GetOptimizers gets the list of optimizers in chain `c`.

func (*Chain) Optimize ¶

func (c *Chain) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type CleanContentstream ¶

CleanContentstream cleans up redundant operands in content streams, including Page and XObject Form contents. This process includes: 1. Marked content operators are removed. 2. Some operands are simplified (shorter form). TODO: Add more reduction methods and improving the methods for identifying unnecessary operands.

type CleanContentstream struct {
}

func (*CleanContentstream) Optimize ¶

func (c *CleanContentstream) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type CleanFonts ¶

CleanFonts cleans up embedded fonts, reducing font sizes.

type CleanFonts struct {
    // Subset embedded fonts if encountered (if true).
    // Otherwise attempts to reduce the font program.
    Subset bool
}

func (*CleanFonts) Optimize ¶

func (c *CleanFonts) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type CleanUnusedResources ¶

CleanUnusedResources represents an optimizer used to clean unused resources.

type CleanUnusedResources struct {
}

func (*CleanUnusedResources) Optimize ¶

func (cleaner *CleanUnusedResources) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize implements Optimizer interface.

type CombineDuplicateDirectObjects ¶

CombineDuplicateDirectObjects combines duplicated direct objects by its data hash. It implements interface model.Optimizer.

type CombineDuplicateDirectObjects struct {
}

func (*CombineDuplicateDirectObjects) Optimize ¶

func (dup *CombineDuplicateDirectObjects) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type CombineDuplicateStreams ¶

CombineDuplicateStreams combines duplicated streams by its data hash. It implements interface model.Optimizer.

type CombineDuplicateStreams struct {
}

func (*CombineDuplicateStreams) Optimize ¶

func (dup *CombineDuplicateStreams) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type CombineIdenticalIndirectObjects ¶

CombineIdenticalIndirectObjects combines identical indirect objects. It implements interface model.Optimizer.

type CombineIdenticalIndirectObjects struct {
}

func (*CombineIdenticalIndirectObjects) Optimize ¶

func (c *CombineIdenticalIndirectObjects) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type CompressStreams ¶

CompressStreams compresses uncompressed streams. It implements interface model.Optimizer.

type CompressStreams struct {
}

func (*CompressStreams) Optimize ¶

func (c *CompressStreams) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type Image ¶

Image optimizes images by rewrite images into JPEG format with quality equals to ImageQuality. TODO(a5i): Add support for inline images. It implements interface model.Optimizer.

type Image struct {
    ImageQuality int
}

func (*Image) Optimize ¶

func (i *Image) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type ImagePPI ¶

ImagePPI optimizes images by scaling images such that the PPI (pixels per inch) is never higher than ImageUpperPPI. TODO(a5i): Add support for inline images. It implements interface model.Optimizer.

type ImagePPI struct {
    ImageUpperPPI float64
}

func (*ImagePPI) Optimize ¶

func (i *ImagePPI) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type ObjectStreams ¶

ObjectStreams groups PDF objects to object streams. It implements interface model.Optimizer.

type ObjectStreams struct {
}

func (*ObjectStreams) Optimize ¶

func (o *ObjectStreams) Optimize(objects []core.PdfObject) (optimizedObjects []core.PdfObject, err error)

Optimize optimizes PDF objects to decrease PDF size.

type Options ¶

Options describes PDF optimization parameters.

type Options struct {
    CombineDuplicateStreams         bool
    CombineDuplicateDirectObjects   bool
    ImageUpperPPI                   float64
    ImageQuality                    int
    UseObjectStreams                bool
    CombineIdenticalIndirectObjects bool
    CompressStreams                 bool
    CleanFonts                      bool
    SubsetFonts                     bool
    CleanContentstream              bool
    CleanUnusedResources            bool
}

Subdirectories