651 lines
27 KiB
Java
651 lines
27 KiB
Java
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics.pdf;
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import static android.graphics.pdf.PdfLinearizationTypes.PDF_DOCUMENT_TYPE_LINEARIZED;
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import android.annotation.FlaggedApi;
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import android.annotation.IntDef;
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import android.annotation.IntRange;
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import android.annotation.Nullable;
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import android.annotation.SuppressLint;
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import android.graphics.Bitmap;
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import android.graphics.Matrix;
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import android.graphics.Rect;
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import android.graphics.pdf.content.PdfPageGotoLinkContent;
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import android.graphics.pdf.content.PdfPageImageContent;
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import android.graphics.pdf.content.PdfPageLinkContent;
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import android.graphics.pdf.content.PdfPageTextContent;
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import android.graphics.pdf.flags.Flags;
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import android.graphics.pdf.models.FormEditRecord;
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import android.graphics.pdf.models.FormWidgetInfo;
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import android.graphics.pdf.models.PageMatchBounds;
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import android.graphics.pdf.models.selection.PageSelection;
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import android.graphics.pdf.models.selection.SelectionBoundary;
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import android.graphics.pdf.utils.Preconditions;
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import android.os.ParcelFileDescriptor;
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import androidx.annotation.NonNull;
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import androidx.annotation.RestrictTo;
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import java.io.IOException;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.util.List;
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/**
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* <p>
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* This class enables rendering a PDF document and selecting, searching, fast scrolling,
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* annotations, etc from Android R till Android U. This class is thread safe and can be called by
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* multiple threads however only one thread will be executed at a time as the access is
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* synchronized by internal locking.
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* <p>
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* If you want to render a PDF, you will need to create a new instance of renderer for each
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* document. To render each page, you open the page using the renderer instance created earlier,
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* render it, and close the page. After you are done with rendering, you close the renderer. After
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* the renderer is closed it should not be used anymore. Note that the pages are rendered one by
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* one, i.e. you can have only a single page opened at any given time.
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* <p>
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* A typical use of the APIs to render a PDF looks like this:
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* <pre>
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* // create a new renderer
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* try (PdfRendererPreV renderer = new PdfRendererPreV(getSeekableFileDescriptor(), loadParams)) {
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* // let us just render all pages
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* final int pageCount = renderer.getPageCount();
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* for (int i = 0; i < pageCount; i++) {
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* Page page = renderer.openPage(i);
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* RenderParams params = new RenderParams.Builder(Page.RENDER_MODE_FOR_DISPLAY).build();
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*
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* // say we render for showing on the screen
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* page.render(mBitmap, params, null, null);
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*
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* // do stuff with the bitmap
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*
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* // close the page
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* page.close();
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* }
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* }
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* </pre>
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* <h3>Print preview and print output</h3>
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* <p>
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* Please refer to {@link PdfRenderer} for fulfilling this usecase.
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*/
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@FlaggedApi(Flags.FLAG_ENABLE_PDF_VIEWER)
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public final class PdfRendererPreV implements AutoCloseable {
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/** Represents a non-linearized PDF document. */
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public static final int DOCUMENT_LINEARIZED_TYPE_NON_LINEARIZED = 0;
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/** Represents a linearized PDF document. */
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public static final int DOCUMENT_LINEARIZED_TYPE_LINEARIZED = 1;
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/** Represents a PDF without form fields */
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@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
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public static final int PDF_FORM_TYPE_NONE = 0;
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/** Represents a PDF with form fields specified using the AcroForm spec */
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@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
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public static final int PDF_FORM_TYPE_ACRO_FORM = 1;
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/** Represents a PDF with form fields specified using the entire XFA spec */
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@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
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public static final int PDF_FORM_TYPE_XFA_FULL = 2;
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/** Represents a PDF with form fields specified using the XFAF subset of the XFA spec */
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@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
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public static final int PDF_FORM_TYPE_XFA_FOREGROUND = 3;
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private final int mPageCount;
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private PdfProcessor mPdfProcessor;
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/**
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* Creates a new instance of PdfRendererPreV class.
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* <p>
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* <strong>Note:</strong> The provided file descriptor must be <strong>seekable</strong>,
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* i.e. its data being randomly accessed, e.g. pointing to a file.
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* <p>
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* <strong>Note:</strong> This class takes ownership of the passed in file descriptor
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* and is responsible for closing it when the renderer is closed.
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* <p>
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* If the file is from an untrusted source it is recommended to run the renderer in a separate,
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* isolated process with minimal permissions to limit the impact of security exploits.
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*
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* @param fileDescriptor Seekable file descriptor to read from.
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* @throws java.io.IOException If an error occurs while reading the file.
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* @throws java.lang.SecurityException If the file requires a password or
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* the security scheme is not supported by the renderer.
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* @throws IllegalArgumentException If the {@link ParcelFileDescriptor} is not seekable.
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* @throws NullPointerException If the file descriptor is null.
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*/
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public PdfRendererPreV(@NonNull ParcelFileDescriptor fileDescriptor) throws IOException {
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Preconditions.checkNotNull(fileDescriptor, "Input FD cannot be null");
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try {
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mPdfProcessor = new PdfProcessor();
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mPdfProcessor.create(fileDescriptor, null);
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mPageCount = mPdfProcessor.getNumPages();
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} catch (Throwable t) {
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doClose();
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throw t;
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}
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}
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/**
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* Creates a new instance of PdfRendererPreV class.
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* <p>
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* <strong>Note:</strong> The provided file descriptor must be <strong>seekable</strong>,
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* i.e. its data being randomly accessed, e.g. pointing to a file. If the password passed in
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* {@link android.graphics.pdf.LoadParams} is incorrect, the
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* {@link android.graphics.pdf.PdfRendererPreV} will throw a {@link SecurityException}.
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* <p>
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* <strong>Note:</strong> This class takes ownership of the passed in file descriptor
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* and is responsible for closing it when the renderer is closed.
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* <p>
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* If the file is from an untrusted source it is recommended to run the renderer in a separate,
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* isolated process with minimal permissions to limit the impact of security exploits.
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*
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* @param fileDescriptor Seekable file descriptor to read from.
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* @param params Instance of {@link LoadParams} specifying params for loading PDF
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* document.
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* @throws java.io.IOException If an error occurs while reading the file.
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* @throws java.lang.SecurityException If the file requires a password or
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* the security scheme is not supported by the renderer.
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* @throws IllegalArgumentException If the {@link ParcelFileDescriptor} is not seekable.
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* @throws NullPointerException If the file descriptor or load params is null.
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*/
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public PdfRendererPreV(@NonNull ParcelFileDescriptor fileDescriptor, @NonNull LoadParams params)
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throws IOException {
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Preconditions.checkNotNull(fileDescriptor, "Input FD cannot be null");
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Preconditions.checkNotNull(params, "LoadParams cannot be null");
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try {
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mPdfProcessor = new PdfProcessor();
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mPdfProcessor.create(fileDescriptor, params);
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mPageCount = mPdfProcessor.getNumPages();
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} catch (Throwable t) {
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doClose();
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throw t;
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}
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}
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/**
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* Gets the number of pages in the document.
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*
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* @return The page count.
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* @throws IllegalStateException If {@link #close()} is called before invoking this.
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*/
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@IntRange(from = 0)
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public int getPageCount() {
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throwIfDocumentClosed();
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return mPageCount;
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}
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/**
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* Gets the type of the PDF document.
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*
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* @return The PDF document type.
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* @throws IllegalStateException If {@link #close()} is called before invoking this.
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*/
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@PdfDocumentLinearizationType
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public int getDocumentLinearizationType() {
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throwIfDocumentClosed();
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int documentType = mPdfProcessor.getDocumentLinearizationType();
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if (documentType == PDF_DOCUMENT_TYPE_LINEARIZED) {
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return DOCUMENT_LINEARIZED_TYPE_LINEARIZED;
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} else {
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return DOCUMENT_LINEARIZED_TYPE_NON_LINEARIZED;
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}
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}
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/**
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* Opens a {@link Page} for rendering.
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*
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* @param index The page index to open, starting from index 0.
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* @return A page that can be rendered.
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* @throws IllegalStateException If {@link #close()} is called before invoking this.
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* @throws IllegalArgumentException If the page number is less than 0 or greater than or equal
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* to the total page count.
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*/
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@NonNull
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public Page openPage(@IntRange(from = 0) int index) {
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throwIfDocumentClosed();
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throwIfPageNotInDocument(index);
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return new Page(index);
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}
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/**
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* Returns the form type of the loaded PDF
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*
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* @throws IllegalStateException if the renderer is closed
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* @throws IllegalArgumentException if an unexpected PDF form type is returned
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*/
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@PdfFormType
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@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
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public int getPdfFormType() {
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throwIfDocumentClosed();
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int pdfFormType = mPdfProcessor.getPdfFormType();
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if (pdfFormType == PDF_FORM_TYPE_ACRO_FORM) {
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return PDF_FORM_TYPE_ACRO_FORM;
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} else if (pdfFormType == PDF_FORM_TYPE_XFA_FULL) {
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return PDF_FORM_TYPE_XFA_FULL;
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} else if (pdfFormType == PDF_FORM_TYPE_XFA_FOREGROUND) {
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return PDF_FORM_TYPE_XFA_FOREGROUND;
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} else {
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return PDF_FORM_TYPE_NONE;
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}
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}
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/**
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* <p>
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* Saves the current state of the loaded PDF document to the given writable
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* {@link ParcelFileDescriptor}. If the document is password-protected then setting
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* {@code removePasswordProtection} removes the protection before saving. The PDF document
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* should already be decrypted with the correct password before writing. Useful for printing or
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* sharing.
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* <strong>Note:</strong> This method closes the provided file descriptor.
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*
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* @param destination The writable {@link ParcelFileDescriptor}
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* @param removePasswordProtection If true, removes password protection from the PDF before
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* saving.
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* @throws IOException If there's a write error, or if 'removePasswordSecurity' is
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* {@code true} but the document remains encrypted.
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* @throws IllegalStateException If {@link #close()} is called before invoking this.
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*/
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public void write(@NonNull ParcelFileDescriptor destination, boolean removePasswordProtection)
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throws IOException {
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throwIfDocumentClosed();
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mPdfProcessor.write(destination, removePasswordProtection);
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}
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/**
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* Closes this renderer and destroys any cached instance of the document. You should not use
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* this instance after this method is called.
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*
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* @throws IllegalStateException If {@link #close()} is called before invoking this.
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*/
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@Override
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public void close() {
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throwIfDocumentClosed();
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doClose();
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}
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// SuppressLint: Finalize needs to be overridden to make sure all resources are closed
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// gracefully
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@Override
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@SuppressLint("GenericException")
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protected void finalize() throws Throwable {
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try {
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doClose();
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} finally {
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super.finalize();
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}
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}
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private void doClose() {
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if (mPdfProcessor != null) {
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mPdfProcessor.ensurePdfDestroyed();
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mPdfProcessor = null;
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}
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}
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private void throwIfDocumentClosed() {
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if (mPdfProcessor == null) {
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throw new IllegalStateException("Document already closed!");
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}
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}
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private void throwIfPageNotInDocument(int pageIndex) {
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if (pageIndex < 0 || pageIndex >= mPageCount) {
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throw new IllegalArgumentException("Invalid page index");
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}
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}
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/** @hide */
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@IntDef({PDF_FORM_TYPE_NONE, PDF_FORM_TYPE_ACRO_FORM, PDF_FORM_TYPE_XFA_FULL,
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PDF_FORM_TYPE_XFA_FOREGROUND})
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@Retention(RetentionPolicy.SOURCE)
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public @interface PdfFormType {
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}
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/** @hide */
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@RestrictTo(RestrictTo.Scope.LIBRARY)
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@Retention(RetentionPolicy.SOURCE)
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@IntDef(prefix = {"PDF_DOCUMENT_TYPE_"}, value = {DOCUMENT_LINEARIZED_TYPE_NON_LINEARIZED,
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DOCUMENT_LINEARIZED_TYPE_LINEARIZED})
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public @interface PdfDocumentLinearizationType {
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}
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/**
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* This class represents a PDF document page for rendering.
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*/
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public final class Page implements AutoCloseable {
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private final int mWidth;
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private final int mHeight;
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private int mIndex;
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private Page(int index) {
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this.mIndex = index;
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mWidth = mPdfProcessor.getPageWidth(index);
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mHeight = mPdfProcessor.getPageHeight(index);
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}
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/**
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* Gets the page index.
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*
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* @return The index.
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*/
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@IntRange(from = 0)
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public int getIndex() {
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return mIndex;
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}
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/**
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* Renders a page to a bitmap. In case of default zoom, the {@link Bitmap} dimensions will
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* be equal to the page dimensions. In this case, {@link Rect} parameter can be null.
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*
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* <p>In case of zoom, the {@link Rect} parameter needs to be specified which represents
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* the offset from top and left for tile generation purposes. In this case, the
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* {@link Bitmap} dimensions should be equal to the tile dimensions.
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* <p>
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* <strong>Note:</strong> The method will take care of closing the bitmap. Should be
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* invoked
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* on the {@link android.annotation.WorkerThread} as it is long-running task.
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*
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* @param destination Destination bitmap to write to.
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* @param destClip If null, default zoom is applied. In case the value is non-null, the
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* value specifies the top top-left corner of the tile.
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* @param transform Applied to scale the bitmap up/down from default 1/72 points.
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* @param params Render params for the changing display mode and/or annotations.
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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public void render(@NonNull Bitmap destination, @Nullable Rect destClip,
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@Nullable Matrix transform, @NonNull RenderParams params) {
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throwIfDocumentOrPageClosed();
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mPdfProcessor.renderPage(mIndex, destination, destClip, transform, params);
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}
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/**
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* Return list of {@link PdfPageTextContent} found on the page, ordered left to right
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* and top to bottom. It contains all the content associated with text found on the page.
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* The list will be empty if there are no results found. Currently, localisation does
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* not have any impact on the order in which {@link PdfPageTextContent} is returned.
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*
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* @return list of text content found on the page.
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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@NonNull
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public List<PdfPageTextContent> getTextContents() {
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throwIfDocumentOrPageClosed();
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return mPdfProcessor.getPageTextContents(mIndex);
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}
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/**
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* Return list of {@link PdfPageImageContent} found on the page, ordered left to right
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* and top to bottom. It contains all the content associated with images found on the
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* page including alt text. The list will be empty if there are no results found.
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* Currently, localisation does not have any impact on the order in which
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* {@link PdfPageImageContent} is returned.
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*
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* @return list of image content found on the page.
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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@NonNull
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public List<PdfPageImageContent> getImageContents() {
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throwIfDocumentOrPageClosed();
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return mPdfProcessor.getPageImageContents(mIndex);
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}
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/**
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* Returns the width of the given {@link Page} object in points (1/72"). It is not
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* guaranteed that all pages will have the same width and the viewport should be resized to
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* the given page width.
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*
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* @return width of the given page
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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@IntRange(from = 0)
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public int getWidth() {
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throwIfDocumentOrPageClosed();
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return mWidth;
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}
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/**
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* Returns the height of the given {@link Page} object in points (1/72"). It is not
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* guaranteed that all pages will have the same height and the viewport should be resized to
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* the given page height.
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*
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* @return height of the given page
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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@IntRange(from = 0)
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public int getHeight() {
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throwIfDocumentOrPageClosed();
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return mHeight;
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}
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/**
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* Search for the given string on the page and returns the bounds of all the matches. The
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* list will be empty if there are no matches on the given page. If this function was
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* invoked previously for any page, it will wait for that operation to
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* complete before this operation is started.
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* <p>
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* <strong>Note:</strong> Should be invoked on the {@link android.annotation.WorkerThread}
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* as it is long-running task.
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*
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* @param query plain search string for querying the document
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* @return List of {@link PageMatchBounds} representing the bounds of each match on the
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* page.
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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@NonNull
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public List<PageMatchBounds> searchText(@NonNull String query) {
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throwIfDocumentOrPageClosed();
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return mPdfProcessor.searchPageText(mIndex, query);
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}
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/**
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* Return a {@link PageSelection} which represents the selected content that spans between
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* the two boundaries. The boundaries can be either exactly defined with text indexes, or
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* approximately defined with points on the page. The resulting selection will also be
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* exactly defined with both indexes and points. If the start and stop boundary are both at
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* the same point, selects the word at that point. In case the selection from the given
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* boundaries result in an empty space, then the method returns {@code null}. The start and
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* stop {@link SelectionBoundary} in {@link PageSelection} resolves to the "nearest" index
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* when returned.
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* <p>
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* <strong>Note:</strong> Should be invoked on a {@link android.annotation.WorkerThread}
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* as it is long-running task.
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*
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* @param start boundary where the selection starts (inclusive)
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* @param stop boundary where the selection stops (exclusive)
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* @return collection of the selected content for text, images, etc.
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* @throws IllegalStateException If the document/page is closed before invocation.
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*/
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@Nullable
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public PageSelection selectContent(@NonNull SelectionBoundary start,
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@NonNull SelectionBoundary stop) {
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throwIfDocumentOrPageClosed();
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return mPdfProcessor.selectPageText(mIndex, start, stop);
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}
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/**
|
|
* Get the bounds and URLs of all the links on the given page.
|
|
*
|
|
* @return list of all links on the page.
|
|
* @throws IllegalStateException If the document/page is closed before invocation.
|
|
*/
|
|
@NonNull
|
|
public List<PdfPageLinkContent> getLinkContents() {
|
|
throwIfDocumentOrPageClosed();
|
|
return mPdfProcessor.getPageLinkContents(mIndex);
|
|
}
|
|
|
|
/**
|
|
* Gets bookmarks and goto links present on the page of a pdf document. Goto Links
|
|
* are the internal navigation links which directs the user to different location
|
|
* within the same document.
|
|
*
|
|
* @return list of all goto links {@link PdfPageGotoLinkContent} on a page, ordered
|
|
* left to right and top to bottom.
|
|
* @throws IllegalStateException If the document/page is closed before invocation.
|
|
*/
|
|
@NonNull
|
|
public List<PdfPageGotoLinkContent> getGotoLinks() {
|
|
throwIfDocumentOrPageClosed();
|
|
return mPdfProcessor.getPageGotoLinks(mIndex);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns information about all form widgets on the page, or an empty list if there are no
|
|
* form widgets on the page.
|
|
*
|
|
* @throws IllegalStateException If the document is already closed.
|
|
* @throws IllegalStateException If the page is already closed.
|
|
*/
|
|
@NonNull
|
|
@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
|
|
public List<FormWidgetInfo> getFormWidgetInfos() {
|
|
return getFormWidgetInfos(new int[0]);
|
|
}
|
|
|
|
/**
|
|
* Returns information about all form widgets of the specified types on the page, or an
|
|
* empty list if there are no form widgets of the specified types on the page.
|
|
*
|
|
* @param types the types of form widgets to return, or an empty array to return all widgets
|
|
* @throws IllegalStateException If the document is already closed.
|
|
* @throws IllegalStateException If the page is already closed.
|
|
*/
|
|
@NonNull
|
|
@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
|
|
public List<FormWidgetInfo> getFormWidgetInfos(
|
|
@NonNull @FormWidgetInfo.WidgetType int[] types) {
|
|
throwIfDocumentClosed();
|
|
throwIfPageClosed();
|
|
return mPdfProcessor.getFormWidgetInfos(mIndex, types);
|
|
}
|
|
|
|
/**
|
|
* Returns information about the widget with {@code annotationIndex}.
|
|
*
|
|
* @param annotationIndex the index of the widget within the page's "Annot" array in the
|
|
* PDF document, available on results of previous calls to
|
|
* {@link #getFormWidgetInfos(int[])} or
|
|
* {@link #getFormWidgetInfoAtPosition(int, int)} via
|
|
* {@link FormWidgetInfo#getWidgetIndex()}.
|
|
* @throws IllegalArgumentException if there is no form widget at the provided index.
|
|
* @throws IllegalStateException If the document is already closed.
|
|
* @throws IllegalStateException If the page is already closed.
|
|
*/
|
|
@NonNull
|
|
@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
|
|
public FormWidgetInfo getFormWidgetInfoAtIndex(@IntRange(from = 0) int annotationIndex) {
|
|
throwIfDocumentClosed();
|
|
throwIfPageClosed();
|
|
return mPdfProcessor.getFormWidgetInfoAtIndex(mIndex, annotationIndex);
|
|
}
|
|
|
|
/**
|
|
* Returns information about the widget at the given point.
|
|
*
|
|
* @param x the x position of the widget on the page, in points
|
|
* @param y the y position of the widget on the page, in points
|
|
* @throws IllegalArgumentException if there is no form widget at the provided position.
|
|
* @throws IllegalStateException If the document is already closed.
|
|
* @throws IllegalStateException If the page is already closed.
|
|
*/
|
|
@NonNull
|
|
@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
|
|
public FormWidgetInfo getFormWidgetInfoAtPosition(int x, int y) {
|
|
throwIfDocumentClosed();
|
|
throwIfPageClosed();
|
|
return mPdfProcessor.getFormWidgetInfoAtPosition(mIndex, x, y);
|
|
}
|
|
|
|
/**
|
|
* Applies a {@link FormEditRecord} to the PDF.
|
|
*
|
|
* <p>Apps must call {@link #render(Bitmap, Rect, Matrix, RenderParams)} to render new
|
|
* bitmaps for the corresponding areas of the page.
|
|
*
|
|
* <p>For click type {@link FormEditRecord}s, performs a click on {@link
|
|
* FormEditRecord#getClickPoint()}
|
|
*
|
|
* <p>For set text type {@link FormEditRecord}s, sets the text value of the form widget.
|
|
*
|
|
* <p>For set indices type {@link FormEditRecord}s, sets the {@link
|
|
* FormEditRecord#getSelectedIndices()} as selected and all others as unselected for the
|
|
* form widget indicated by the record.
|
|
*
|
|
* @param editRecord the {@link FormEditRecord} to be applied
|
|
* @return Rectangular areas of the page bitmap that have been invalidated by this action.
|
|
* @throws IllegalArgumentException if the provided {@link FormEditRecord} cannot be
|
|
* applied to the widget indicated by the index, or if the
|
|
* index does not correspond to a widget on the page.
|
|
* @throws IllegalStateException If the document is already closed.
|
|
* @throws IllegalStateException If the page is already closed.
|
|
*/
|
|
@android.annotation.NonNull
|
|
@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
|
|
public List<Rect> applyEdit(@NonNull FormEditRecord editRecord) {
|
|
throwIfDocumentClosed();
|
|
throwIfPageClosed();
|
|
return mPdfProcessor.applyEdit(mIndex, editRecord);
|
|
}
|
|
|
|
/**
|
|
* Closes this page.
|
|
*
|
|
* @see android.graphics.pdf.PdfRenderer#openPage(int)
|
|
*/
|
|
@Override
|
|
public void close() {
|
|
throwIfDocumentOrPageClosed();
|
|
doClose();
|
|
}
|
|
|
|
// SuppressLint: Finalize needs to be overridden to make sure all resources are closed
|
|
// gracefully.
|
|
@Override
|
|
@SuppressLint("GenericException")
|
|
protected void finalize() throws Throwable {
|
|
try {
|
|
doClose();
|
|
} finally {
|
|
super.finalize();
|
|
}
|
|
}
|
|
|
|
private void doClose() {
|
|
if (mPdfProcessor != null) {
|
|
mPdfProcessor.releasePage(mIndex);
|
|
mIndex = -1;
|
|
}
|
|
}
|
|
|
|
private void throwIfPageClosed() {
|
|
if (mIndex == -1) {
|
|
throw new IllegalStateException("Page already closed!");
|
|
}
|
|
}
|
|
|
|
private void throwIfDocumentOrPageClosed() {
|
|
throwIfDocumentClosed();
|
|
throwIfPageClosed();
|
|
}
|
|
}
|
|
}
|