Trim unnecessary pages when printing. (62ce332c) · Commits · e / os / android_frameworks_base

core/jni/Android.mk

+1 −0

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		@@ -129,6 +129,7 @@ LOCAL_SRC_FILES:= \
		android/graphics/Xfermode.cpp \
		android/graphics/YuvToJpegEncoder.cpp \
		android/graphics/pdf/PdfDocument.cpp \
		android/graphics/pdf/PdfEditor.cpp \
		android/graphics/pdf/PdfRenderer.cpp \
		android_media_AudioRecord.cpp \
		android_media_AudioSystem.cpp \

core/jni/AndroidRuntime.cpp

+2 −0

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		@@ -126,6 +126,7 @@ extern int register_android_graphics_Region(JNIEnv* env);
		extern int register_android_graphics_SurfaceTexture(JNIEnv* env);
		extern int register_android_graphics_Xfermode(JNIEnv* env);
		extern int register_android_graphics_pdf_PdfDocument(JNIEnv* env);
		extern int register_android_graphics_pdf_PdfEditor(JNIEnv* env);
		extern int register_android_graphics_pdf_PdfRenderer(JNIEnv* env);
		extern int register_android_view_DisplayEventReceiver(JNIEnv* env);
		extern int register_android_view_RenderNode(JNIEnv* env);
		@@ -1305,6 +1306,7 @@ static const RegJNIRec gRegJNI[] = {
		REG_JNI(register_android_graphics_Xfermode),
		REG_JNI(register_android_graphics_YuvImage),
		REG_JNI(register_android_graphics_pdf_PdfDocument),
		REG_JNI(register_android_graphics_pdf_PdfEditor),
		REG_JNI(register_android_graphics_pdf_PdfRenderer),

		REG_JNI(register_android_database_CursorWindow),

core/jni/android/graphics/pdf/PdfEditor.cpp

0 → 100644

+161 −0

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		/*
		* Copyright (C) 2014 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#include "jni.h"
		#include "JNIHelp.h"
		#include "fpdfview.h"
		#include "fpdfedit.h"
		#include "fpdfsave.h"

		#include <android_runtime/AndroidRuntime.h>
		#include <vector>
		#include <utils/Log.h>
		#include <unistd.h>
		#include <sys/types.h>
		#include <unistd.h>

		namespace android {

		static Mutex sLock;

		static int sUnmatchedInitRequestCount = 0;

		static void initializeLibraryIfNeeded() {
		Mutex::Autolock _l(sLock);
		if (sUnmatchedInitRequestCount == 0) {
		FPDF_InitLibrary(NULL);
		}
		sUnmatchedInitRequestCount++;
		}

		static void destroyLibraryIfNeeded() {
		Mutex::Autolock _l(sLock);
		sUnmatchedInitRequestCount--;
		if (sUnmatchedInitRequestCount == 0) {
		FPDF_DestroyLibrary();
		}
		}

		static int getBlock(void* param, unsigned long position, unsigned char* outBuffer,
		unsigned long size) {
		const int fd = reinterpret_cast<intptr_t>(param);
		const int readCount = pread(fd, outBuffer, size, position);
		if (readCount < 0) {
		ALOGE("Cannot read from file descriptor. Error:%d", errno);
		return 0;
		}
		return 1;
		}

		static jlong nativeOpen(JNIEnv* env, jclass thiz, jint fd, jlong size) {
		initializeLibraryIfNeeded();

		FPDF_FILEACCESS loader;
		loader.m_FileLen = size;
		loader.m_Param = reinterpret_cast<void*>(intptr_t(fd));
		loader.m_GetBlock = &getBlock;

		FPDF_DOCUMENT document = FPDF_LoadCustomDocument(&loader, NULL);

		if (!document) {
		const long error = FPDF_GetLastError();
		jniThrowException(env, "java/io/IOException",
		"cannot create document. Error:" + error);
		destroyLibraryIfNeeded();
		return -1;
		}

		return reinterpret_cast<jlong>(document);
		}

		static void nativeClose(JNIEnv* env, jclass thiz, jlong documentPtr) {
		FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
		FPDF_CloseDocument(document);
		destroyLibraryIfNeeded();
		}

		static jint nativeGetPageCount(JNIEnv* env, jclass thiz, jlong documentPtr) {
		FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
		return FPDF_GetPageCount(document);
		}

		static jint nativeRemovePage(JNIEnv* env, jclass thiz, jlong documentPtr, jint pageIndex) {
		FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
		FPDFPage_Delete(document, pageIndex);
		return FPDF_GetPageCount(document);
		}

		struct PdfToFdWriter : FPDF_FILEWRITE {
		int dstFd;
		};

		static bool writeAllBytes(const int fd, const void* buffer, const size_t byteCount) {
		char* writeBuffer = static_cast<char>(const_cast<void>(buffer));
		size_t remainingBytes = byteCount;
		while (remainingBytes > 0) {
		ssize_t writtenByteCount = write(fd, writeBuffer, remainingBytes);
		if (writtenByteCount == -1) {
		if (errno == EINTR) {
		continue;
		}
		__android_log_print(ANDROID_LOG_ERROR, LOG_TAG,
		"Error writing to buffer: %d", errno);
		return false;
		}
		remainingBytes -= writtenByteCount;
		writeBuffer += writtenByteCount;
		}
		return true;
		}

		static int writeBlock(FPDF_FILEWRITE* owner, const void* buffer, unsigned long size) {
		const PdfToFdWriter* writer = reinterpret_cast<PdfToFdWriter*>(owner);
		const bool success = writeAllBytes(writer->dstFd, buffer, size);
		if (success < 0) {
		ALOGE("Cannot write to file descriptor. Error:%d", errno);
		return 0;
		}
		return 1;
		}

		static void nativeWrite(JNIEnv* env, jclass thiz, jlong documentPtr, jint fd) {
		FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
		PdfToFdWriter writer;
		writer.dstFd = fd;
		writer.WriteBlock = &writeBlock;
		const bool success = FPDF_SaveAsCopy(document, &writer, FPDF_NO_INCREMENTAL);
		if (!success) {
		jniThrowException(env, "java/io/IOException",
		"cannot write to fd. Error:" + errno);
		destroyLibraryIfNeeded();
		}
		}

		static JNINativeMethod gPdfEditor_Methods[] = {
		{"nativeOpen", "(IJ)J", (void*) nativeOpen},
		{"nativeClose", "(J)V", (void*) nativeClose},
		{"nativeGetPageCount", "(J)I", (void*) nativeGetPageCount},
		{"nativeRemovePage", "(JI)I", (void*) nativeRemovePage},
		{"nativeWrite", "(JI)V", (void*) nativeWrite}
		};

		int register_android_graphics_pdf_PdfEditor(JNIEnv* env) {
		return android::AndroidRuntime::registerNativeMethods(
		env, "android/graphics/pdf/PdfEditor", gPdfEditor_Methods,
		NELEM(gPdfEditor_Methods));
		};

		};

graphics/java/android/graphics/pdf/PdfEditor.java

0 → 100644

+162 −0

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		/*
		* Copyright (C) 2014 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package android.graphics.pdf;

		import android.annotation.NonNull;
		import android.os.ParcelFileDescriptor;
		import android.system.ErrnoException;
		import android.system.OsConstants;
		import dalvik.system.CloseGuard;
		import libcore.io.IoUtils;
		import libcore.io.Libcore;

		import java.io.IOException;

		/**
		* Class for editing PDF files.
		*
		* @hide
		*/
		public final class PdfEditor {

		private final CloseGuard mCloseGuard = CloseGuard.get();

		private final long mNativeDocument;

		private int mPageCount;

		private ParcelFileDescriptor mInput;

		/**
		* Creates a new instance.
		* <p>
		* <strong>Note:</strong> The provided file descriptor must be <strong>seekable</strong>,
		* i.e. its data being randomly accessed, e.g. pointing to a file. After finishing
		* with this class you must call {@link #close()}.
		* </p>
		* <p>
		* <strong>Note:</strong> This class takes ownership of the passed in file descriptor
		* and is responsible for closing it when the editor is closed.
		* </p>
		*
		* @param input Seekable file descriptor to read from.
		*
		* @see #close()
		*/
		public PdfEditor(@NonNull ParcelFileDescriptor input) throws IOException {
		if (input == null) {
		throw new NullPointerException("input cannot be null");
		}

		final long size;
		try {
		Libcore.os.lseek(input.getFileDescriptor(), 0, OsConstants.SEEK_SET);
		size = Libcore.os.fstat(input.getFileDescriptor()).st_size;
		} catch (ErrnoException ee) {
		throw new IllegalArgumentException("file descriptor not seekable");
		}

		mInput = input;
		mNativeDocument = nativeOpen(mInput.getFd(), size);
		mPageCount = nativeGetPageCount(mNativeDocument);
		mCloseGuard.open("close");
		}

		/**
		* Gets the number of pages in the document.
		*
		* @return The page count.
		*/
		public int getPageCount() {
		throwIfClosed();
		return mPageCount;
		}

		/**
		* Removes the page with a given index.
		*
		* @param pageIndex The page to remove.
		*/
		public void removePage(int pageIndex) {
		throwIfClosed();
		throwIfPageNotInDocument(pageIndex);
		mPageCount = nativeRemovePage(mNativeDocument, pageIndex);
		}

		/**
		* Writes the PDF file to the provided destination.
		* <p>
		* <strong>Note:</strong> This method takes ownership of the passed in file
		* descriptor and is responsible for closing it when writing completes.
		* </p>
		* @param output The destination.
		*/
		public void write(ParcelFileDescriptor output) throws IOException {
		try {
		throwIfClosed();
		nativeWrite(mNativeDocument, output.getFd());
		} finally {
		IoUtils.closeQuietly(output);
		}
		}

		/**
		* Closes this editor. You should not use this instance
		* after this method is called.
		*/
		public void close() {
		throwIfClosed();
		doClose();
		}

		@Override
		protected void finalize() throws Throwable {
		try {
		mCloseGuard.warnIfOpen();
		if (mInput != null) {
		doClose();
		}
		} finally {
		super.finalize();
		}
		}

		private void doClose() {
		nativeClose(mNativeDocument);
		IoUtils.closeQuietly(mInput);
		mInput = null;
		mCloseGuard.close();
		}

		private void throwIfClosed() {
		if (mInput == null) {
		throw new IllegalStateException("Already closed");
		}
		}

		private void throwIfPageNotInDocument(int pageIndex) {
		if (pageIndex < 0 \|\| pageIndex >= mPageCount) {
		throw new IllegalArgumentException("Invalid page index");
		}
		}

		private static native long nativeOpen(int fd, long size);
		private static native void nativeClose(long documentPtr);
		private static native int nativeGetPageCount(long documentPtr);
		private static native int nativeRemovePage(long documentPtr, int pageIndex);
		private static native void nativeWrite(long documentPtr, int fd);
		}

graphics/java/android/graphics/pdf/PdfRenderer.java

+1 −1

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		@@ -239,7 +239,7 @@ public final class PdfRenderer implements AutoCloseable {
		}

		private void throwIfPageNotInDocument(int pageIndex) {
		if (pageIndex >= mPageCount) {
		if (pageIndex < 0 \|\| pageIndex >= mPageCount) {
		throw new IllegalArgumentException("Invalid page index");
		}
		}