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danfickle#472 Refactor functinality of MergeBackgroundPdfDrawer into …
…a baseclass, and add ForegroundPdfDrawer which always puts the PDF in front of the page.
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67 changes: 67 additions & 0 deletions
67
openhtmltopdf-objects/src/main/java/com/openhtmltopdf/objects/pdf/ForegroundPdfDrawer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package com.openhtmltopdf.objects.pdf; | ||
|
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| import com.openhtmltopdf.extend.OutputDevice; | ||
| import com.openhtmltopdf.pdfboxout.PdfBoxOutputDevice; | ||
| import com.openhtmltopdf.render.RenderingContext; | ||
| import org.apache.pdfbox.cos.COSArray; | ||
| import org.apache.pdfbox.cos.COSName; | ||
| import org.apache.pdfbox.cos.COSStream; | ||
| import org.apache.pdfbox.multipdf.LayerUtility; | ||
| import org.apache.pdfbox.pdmodel.PDPage; | ||
| import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject; | ||
| import org.apache.pdfbox.util.Charsets; | ||
| import org.w3c.dom.Element; | ||
|
|
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| import java.awt.*; | ||
| import java.io.IOException; | ||
| import java.io.OutputStream; | ||
| import java.util.Map; | ||
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| public class ForegroundPdfDrawer extends PdfDrawerBase | ||
| { | ||
| @Override | ||
| public Map<Shape, String> drawObject(Element e, double x, double y, double width, double height, | ||
| OutputDevice outputDevice, RenderingContext ctx, int dotsPerPixel) | ||
| { | ||
|
|
||
| /* | ||
| * We can only do something if this is a PDF. | ||
| */ | ||
| if (!(outputDevice instanceof PdfBoxOutputDevice)) | ||
| return null; | ||
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| PdfBoxOutputDevice pdfBoxOutputDevice = (PdfBoxOutputDevice) outputDevice; | ||
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| try | ||
| { | ||
| LayerUtility layerUtility = new LayerUtility(pdfBoxOutputDevice.getWriter()); | ||
| PDFormXObject pdFormXObject = importPageAsXForm(ctx, e, pdfBoxOutputDevice, | ||
| layerUtility); | ||
| PDPage page = pdfBoxOutputDevice.getPage(); | ||
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|
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| /* | ||
| * This ensures that the Contents of the page is a COSArray. The first entry in | ||
| * the array is just a save state (e.g. 'q'), the last one is just a restore 'Q'. | ||
| * We can override that to add the XForm. | ||
| */ | ||
| layerUtility.wrapInSaveRestore(page); | ||
| COSArray cosArray = (COSArray) page.getCOSObject() | ||
| .getDictionaryObject(COSName.CONTENTS); | ||
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| COSStream restoreStateAndPlaceWatermark = (COSStream) cosArray.get(cosArray.size() - 1); | ||
| OutputStream watermarkOutputStream = restoreStateAndPlaceWatermark.createOutputStream(); | ||
| watermarkOutputStream.write("Q\nq\n".getBytes(Charsets.US_ASCII)); | ||
| COSName name = page.getResources().add(pdFormXObject); | ||
| name.writePDF(watermarkOutputStream); | ||
| watermarkOutputStream.write(' '); | ||
| watermarkOutputStream.write("Do\n".getBytes(Charsets.US_ASCII)); | ||
| watermarkOutputStream.write("Q\n".getBytes(Charsets.US_ASCII)); | ||
| watermarkOutputStream.close(); | ||
| } | ||
| catch (IOException e1) | ||
| { | ||
| e1.printStackTrace(); | ||
| } | ||
| return null; | ||
| } | ||
| } |
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99 changes: 99 additions & 0 deletions
99
openhtmltopdf-objects/src/main/java/com/openhtmltopdf/objects/pdf/PdfDrawerBase.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package com.openhtmltopdf.objects.pdf; | ||
|
|
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| import com.openhtmltopdf.extend.FSObjectDrawer; | ||
| import com.openhtmltopdf.pdfboxout.PdfBoxOutputDevice; | ||
| import com.openhtmltopdf.render.RenderingContext; | ||
| import org.apache.pdfbox.io.RandomAccessBuffer; | ||
| import org.apache.pdfbox.multipdf.LayerUtility; | ||
| import org.apache.pdfbox.pdfparser.PDFParser; | ||
| import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject; | ||
| import org.w3c.dom.Element; | ||
|
|
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.lang.ref.SoftReference; | ||
| import java.lang.ref.WeakReference; | ||
| import java.net.URL; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
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| public abstract class PdfDrawerBase implements FSObjectDrawer | ||
| { | ||
| private final Map<PDFBoxDeviceReference, SoftReference<Map<String, PDFormXObject>>> formMap = new HashMap<PDFBoxDeviceReference, SoftReference<Map<String, PDFormXObject>>>(); | ||
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| protected PDFormXObject importPageAsXForm(RenderingContext ctx, Element e, | ||
| PdfBoxOutputDevice pdfBoxOutputDevice, LayerUtility layerUtility) throws IOException | ||
| { | ||
|
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| Map<String, PDFormXObject> map = getFormCacheMap(pdfBoxOutputDevice); | ||
| int pdfpage = getPageNumber(e); | ||
| String pdfsrc = e.getAttribute("pdfsrc"); | ||
| String url = ctx.getUac().resolveURI(pdfsrc); | ||
|
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| PDFormXObject pdFormXObject = map.get(url); | ||
| if (pdFormXObject == null) | ||
| { | ||
| try (InputStream inputStream = new URL(url).openStream()) | ||
| { | ||
| PDFParser pdfParser = new PDFParser(new RandomAccessBuffer(inputStream)); | ||
| pdfParser.parse(); | ||
| pdFormXObject = layerUtility | ||
| .importPageAsForm(pdfParser.getPDDocument(), pdfpage - 1); | ||
| pdfParser.getPDDocument().close(); | ||
| } | ||
| map.put(url, pdFormXObject); | ||
| } | ||
| return pdFormXObject; | ||
| } | ||
|
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| protected Map<String, PDFormXObject> getFormCacheMap(PdfBoxOutputDevice pdfBoxOutputDevice) | ||
| { | ||
| SoftReference<Map<String, PDFormXObject>> mapWeakReference = formMap | ||
| .get(new PDFBoxDeviceReference(pdfBoxOutputDevice)); | ||
| Map<String, PDFormXObject> map = null; | ||
| if (mapWeakReference != null) | ||
| map = mapWeakReference.get(); | ||
| if (map == null) | ||
| { | ||
| map = new HashMap<String, PDFormXObject>(); | ||
| formMap.put(new PDFBoxDeviceReference(pdfBoxOutputDevice), | ||
| new SoftReference<Map<String, PDFormXObject>>(map)); | ||
| } | ||
| return map; | ||
| } | ||
|
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| protected int getPageNumber(Element e) | ||
| { | ||
| String pdfpageValue = e.getAttribute("pdfpage"); | ||
| if (pdfpageValue == null || pdfpageValue.isEmpty()) | ||
| pdfpageValue = "1"; | ||
| return Integer.parseInt(pdfpageValue); | ||
| } | ||
|
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| private static class PDFBoxDeviceReference extends WeakReference<PdfBoxOutputDevice> | ||
| { | ||
| PDFBoxDeviceReference(PdfBoxOutputDevice referent) | ||
| { | ||
| super(referent); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) | ||
| { | ||
| if (obj instanceof PDFBoxDeviceReference) | ||
| { | ||
| return ((PDFBoxDeviceReference) obj).get() == get(); | ||
| } | ||
| return super.equals(obj); | ||
| } | ||
|
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| @Override | ||
| public int hashCode() | ||
| { | ||
| PdfBoxOutputDevice pdfBoxOutputDevice = get(); | ||
| if (pdfBoxOutputDevice != null) | ||
| return pdfBoxOutputDevice.hashCode(); | ||
| return 0; | ||
| } | ||
| } | ||
| } |