mirror of
https://github.com/unidoc/unipdf.git
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50041f0a78
Exported NewPdfColorspaceFromPdfObject so could use it from package content stream. Moving from dot imports.
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package contentstream
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import (
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"errors"
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"github.com/unidoc/unidoc/common"
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"github.com/unidoc/unidoc/pdf/core"
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"github.com/unidoc/unidoc/pdf/model"
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)
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func makeParamsFromFloats(vals []float64) []core.PdfObject {
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params := []core.PdfObject{}
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for _, val := range vals {
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params = append(params, core.MakeFloat(val))
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}
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return params
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}
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func makeParamsFromNames(vals []core.PdfObjectName) []core.PdfObject {
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params := []core.PdfObject{}
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for _, val := range vals {
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params = append(params, core.MakeName(string(val)))
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}
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return params
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}
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func makeParamsFromStrings(vals []core.PdfObjectString) []core.PdfObject {
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params := []core.PdfObject{}
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for _, val := range vals {
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params = append(params, core.MakeString(string(val)))
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}
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return params
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}
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func makeParamsFromInts(vals []int64) []core.PdfObject {
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params := []core.PdfObject{}
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for _, val := range vals {
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params = append(params, core.MakeInteger(val))
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}
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return params
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}
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func newIndexedColorspaceFromPdfObject(obj core.PdfObject) (model.PdfColorspace, error) {
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arr, ok := obj.(*core.PdfObjectArray)
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if !ok {
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common.Log.Debug("Error: Invalid indexed cs not in array (%#v)", obj)
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return nil, errors.New("Type check error")
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}
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if len(*arr) != 4 {
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common.Log.Debug("Error: Invalid cs array, length != 4 (%d)", len(*arr))
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return nil, errors.New("Range check error")
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}
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// Format is [/I base 255 bytes], where base = /G,/RGB,/CMYK
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name, ok := (*arr)[0].(*core.PdfObjectName)
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if !ok {
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common.Log.Debug("Error: Invalid cs array first element not a name (array: %#v)", *arr)
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return nil, errors.New("Type check error")
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}
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if *name != "I" {
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common.Log.Debug("Error: Invalid cs array first element != I (got: %v)", *name)
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return nil, errors.New("Range check error")
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}
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// Check base
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name, ok = (*arr)[1].(*core.PdfObjectName)
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if !ok {
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common.Log.Debug("Error: Invalid cs array 2nd element not a name (array: %#v)", *arr)
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return nil, errors.New("Type check error")
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}
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if *name != "G" && *name != "RGB" && *name != "CMYK" {
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common.Log.Debug("Error: Invalid cs array 2nd element != G/RGB/CMYK (got: %v)", *name)
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return nil, errors.New("Range check error")
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}
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basename := ""
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switch *name {
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case "G":
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basename = "DeviceGray"
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case "RGB":
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basename = "DeviceRGB"
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case "CMYK":
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basename = "DeviceCMYK"
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}
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// Prepare to a format that can be loaded by model's newPdfColorspaceFromPdfObject.
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csArr := core.MakeArray(core.MakeName("Indexed"), core.MakeName(basename), (*arr)[2], (*arr)[3])
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return model.NewPdfColorspaceFromPdfObject(csArr)
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}
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