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Block supporting more resource types (pattern, shading)

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This commit is contained in:
Gunnsteinn Hall 2018-05-22 12:57:32 +00:00
parent a1a95012ea
commit 0c9502ad8b
1 changed files with 81 additions and 7 deletions
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88
pdf/creator/block.go
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@ -7,9 +7,9 @@ package creator
import (
"errors"
"fmt"
"github.com/unidoc/unidoc/common"
"github.com/unidoc/unidoc/pdf/contentstream"
"github.com/unidoc/unidoc/pdf/core"
"github.com/unidoc/unidoc/pdf/model"
@ -344,13 +344,15 @@ func mergeContents(contents *contentstream.ContentStreamOperations, resources *m
// To properly add contents from a block, we need to handle the resources that the block is
// using and make sure it is accessible in the modified Page.
//
// Currently only supporting: Font, XObject, Colormap resources
// Currently supporting: Font, XObject, Colormap, Pattern, Shading, GState resources
// from the block.
//
xobjectMap := map[core.PdfObjectName]core.PdfObjectName{}
fontMap := map[core.PdfObjectName]core.PdfObjectName{}
csMap := map[core.PdfObjectName]core.PdfObjectName{}
patternMap := map[core.PdfObjectName]core.PdfObjectName{}
shadingMap := map[core.PdfObjectName]core.PdfObjectName{}
gstateMap := map[core.PdfObjectName]core.PdfObjectName{}
for _, op := range *contentsToAdd {
@ -426,14 +428,86 @@ func mergeContents(contents *contentstream.ContentStreamOperations, resources *m
}
useName = useName + "0"
}
}
resources.SetColorspaceByName(useName, cs)
csMap[*name] = useName
resources.SetColorspaceByName(useName, cs)
csMap[*name] = useName
} else {
common.Log.Debug("Colorspace not found")
}
}
useName := csMap[*name]
op.Params[0] = &useName
if useName, has := csMap[*name]; has {
op.Params[0] = &useName
} else {
common.Log.Debug("Error: Colorspace %s not found", *name)
}
}
}
case "SCN", "scn":
if len(op.Params) == 1 {
if name, ok := op.Params[0].(*core.PdfObjectName); ok {
if _, processed := patternMap[*name]; !processed {
var useName core.PdfObjectName
p, found := resourcesToAdd.GetPatternByName(*name)
if found {
useName = *name
for {
p2, found := resources.GetPatternByName(useName)
if !found || p2 == p {
break
}
useName = useName + "0"
}
err := resources.SetPatternByName(useName, p.ToPdfObject())
if err != nil {
return err
}
patternMap[*name] = useName
}
}
if useName, has := patternMap[*name]; has {
op.Params[0] = &useName
}
}
}
case "sh":
// Shading.
if len(op.Params) == 1 {
if name, ok := op.Params[0].(*core.PdfObjectName); ok {
if _, processed := shadingMap[*name]; !processed {
var useName core.PdfObjectName
// Process if not already processed.
sh, found := resourcesToAdd.GetShadingByName(*name)
if found {
useName = *name
for {
sh2, found := resources.GetShadingByName(useName)
if !found || sh == sh2 {
break
}
useName = useName + "0"
}
err := resources.SetShadingByName(useName, sh.ToPdfObject())
if err != nil {
common.Log.Debug("ERROR Set shading: %v", err)
return err
}
shadingMap[*name] = useName
} else {
common.Log.Debug("Shading not found")
}
}
if useName, has := shadingMap[*name]; has {
op.Params[0] = &useName
} else {
common.Log.Debug("Error: Shading %s not found", *name)
}
}
}
case "gs":