Switching to raw byte copy of bitmaps for print preview.

Using compression and decompression for moving bitmap data
acorss processes is slow as compression is expensive. This
change switches to using direct streaming of the bitmap
data.

bug:15938254

Change-Id: I78bc450031ee60ada4c3b66f14586a73c72ce34f

packages/PrintSpooler/Android.mk

@@ -26,3 +26,5 @@ LOCAL_PACKAGE_NAME := PrintSpooler
 LOCAL_STATIC_JAVA_LIBRARIES := android-support-v4 android-support-v7-recyclerview
 
 include $(BUILD_PACKAGE)
+
+include $(call all-makefiles-under, $(LOCAL_PATH))

packages/PrintSpooler/jni/Android.mk

@@ -0,0 +1,19 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+    com_android_printspooler_util_BitmapSerializeUtils.cpp \
+
+LOCAL_C_INCLUDES += \
+    $(JNI_H_INCLUDE)
+
+LOCAL_SHARED_LIBRARIES := \
+    libnativehelper
+
+LOCAL_LDLIBS := -lm -llog -ljnigraphics
+
+LOCAL_MODULE := libprintspooler_jni
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)

packages/PrintSpooler/jni/com_android_printspooler_util_BitmapSerializeUtils.cpp

@@ -0,0 +1,192 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "BitmapSerializeUtils"
+
+#include <jni.h>
+#include <JNIHelp.h>
+
+#include <android/bitmap.h>
+#include <android/log.h>
+
+namespace android {
+
+#define RGBA_8888_COLOR_DEPTH 4
+
+static bool writeAllBytes(const int fd, void* buffer, const size_t byteCount) {
+    char* writeBuffer = static_cast<char*>(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 bool readAllBytes(const int fd, void* buffer, const size_t byteCount) {
+    char* readBuffer = static_cast<char*>(buffer);
+    size_t remainingBytes = byteCount;
+    while (remainingBytes > 0) {
+        ssize_t readByteCount = read(fd, readBuffer, remainingBytes);
+        if (readByteCount == -1) {
+            if (errno == EINTR) {
+                continue;
+            }
+            __android_log_print(ANDROID_LOG_ERROR, LOG_TAG,
+                    "Error reading from buffer: %d", errno);
+            return false;
+        }
+        remainingBytes -= readByteCount;
+        readBuffer += readByteCount;
+    }
+    return true;
+}
+
+static void throwException(JNIEnv* env, const char* className, const char* message) {
+    jclass exceptionClass = env->FindClass(className);
+    env->ThrowNew(exceptionClass, message);
+}
+
+static void throwIllegalStateException(JNIEnv* env, char *message) {
+    const char* className = "java/lang/IllegalStateException";
+    throwException(env, className, message);
+}
+
+static void throwIllegalArgumentException(JNIEnv* env, char* message) {
+    const char* className = "java/lang/IllegalArgumentException";
+    throwException(env, className, message);
+}
+
+static void readBitmapPixels(JNIEnv* env, jclass clazz, jobject jbitmap, jint fd) {
+    // Read the info.
+    AndroidBitmapInfo readInfo;
+    bool read = readAllBytes(fd, (void*) &readInfo, sizeof(AndroidBitmapInfo));
+    if (!read) {
+        throwIllegalStateException(env, (char*) "Cannot read bitmap info");
+        return;
+    }
+
+    // Get the info of the target bitmap.
+    AndroidBitmapInfo targetInfo;
+    int result = AndroidBitmap_getInfo(env, jbitmap, &targetInfo);
+    if (result < 0) {
+        throwIllegalStateException(env, (char*) "Cannot get bitmap info");
+        return;
+    }
+
+    // Enforce we can reuse the bitmap.
+    if (readInfo.width != targetInfo.width || readInfo.height != targetInfo.height
+            || readInfo.stride != targetInfo.stride || readInfo.format != targetInfo.format
+            || readInfo.flags != targetInfo.flags) {
+        throwIllegalArgumentException(env, (char*) "Cannot reuse bitmap");
+        return;
+    }
+
+    // Lock the pixels.
+    void* pixels;
+    result = AndroidBitmap_lockPixels(env, jbitmap, &pixels);
+    if (result < 0) {
+        throwIllegalStateException(env, (char*) "Cannot lock bitmap pixels");
+        return;
+    }
+
+    // Read the pixels.
+    size_t byteCount = readInfo.stride * readInfo.height;
+    read = readAllBytes(fd, (void*) pixels, byteCount);
+    if (!read) {
+        throwIllegalStateException(env, (char*) "Cannot read bitmap pixels");
+        return;
+    }
+
+    // Unlock the pixels.
+    result = AndroidBitmap_unlockPixels(env, jbitmap);
+    if (result < 0) {
+        throwIllegalStateException(env, (char*) "Cannot unlock bitmap pixels");
+    }
+}
+
+static void writeBitmapPixels(JNIEnv* env, jclass clazz, jobject jbitmap, jint fd) {
+    // Get the info.
+    AndroidBitmapInfo info;
+    int result = AndroidBitmap_getInfo(env, jbitmap, &info);
+    if (result < 0) {
+        throwIllegalStateException(env, (char*) "Cannot get bitmap info");
+        return;
+    }
+
+    // Write the info.
+    bool written = writeAllBytes(fd, (void*) &info, sizeof(AndroidBitmapInfo));
+    if (!written) {
+        throwIllegalStateException(env, (char*) "Cannot write bitmap info");
+        return;
+    }
+
+    // Lock the pixels.
+    void* pixels;
+    result = AndroidBitmap_lockPixels(env, jbitmap, &pixels);
+    if (result < 0) {
+        throwIllegalStateException(env, (char*) "Cannot lock bitmap pixels");
+        return;
+    }
+
+    // Write the pixels.
+    size_t byteCount = info.stride * info.height;
+    written = writeAllBytes(fd, (void*) pixels, byteCount);
+    if (!written) {
+        throwIllegalStateException(env, (char*) "Cannot write bitmap pixels");
+        return;
+    }
+
+    // Unlock the pixels.
+    result = AndroidBitmap_unlockPixels(env, jbitmap);
+    if (result < 0) {
+        throwIllegalStateException(env, (char*) "Cannot unlock bitmap pixels");
+    }
+}
+
+static JNINativeMethod sMethods[] = {
+    {"nativeReadBitmapPixels", "(Landroid/graphics/Bitmap;I)V", (void *) readBitmapPixels},
+    {"nativeWriteBitmapPixels", "(Landroid/graphics/Bitmap;I)V", (void *) writeBitmapPixels},
+};
+
+int register_com_android_printspooler_util_BitmapSerializeUtils(JNIEnv* env) {
+    return jniRegisterNativeMethods(env, "com/android/printspooler/util/BitmapSerializeUtils",
+        sMethods, NELEM(sMethods));
+}
+
+}
+
+jint JNI_OnLoad(JavaVM* jvm, void*) {
+    JNIEnv *env = NULL;
+    if (jvm->GetEnv((void**) &env, JNI_VERSION_1_6)) {
+        return JNI_ERR;
+    }
+
+    if (android::register_com_android_printspooler_util_BitmapSerializeUtils(env) == -1) {
+        return JNI_ERR;
+    }
+
+    return JNI_VERSION_1_6;
+}

packages/PrintSpooler/src/com/android/printspooler/model/PageContentRepository.java

@@ -22,9 +22,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
 import android.graphics.Color;
-import android.graphics.Rect;
 import android.graphics.drawable.BitmapDrawable;
 import android.os.AsyncTask;
 import android.os.IBinder;
@@ -38,10 +36,10 @@ import android.view.View;
 import com.android.internal.annotations.GuardedBy;
 import com.android.printspooler.renderer.IPdfRenderer;
 import com.android.printspooler.renderer.PdfRendererService;
+import com.android.printspooler.util.BitmapSerializeUtils;
 import dalvik.system.CloseGuard;
 import libcore.io.IoUtils;
 
-import java.io.FileDescriptor;
 import java.io.IOException;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
@@ -804,9 +802,7 @@ public final class PageContentRepository {
                     // ownership, so close our copy for the write to complete.
                     destination.close();
 
-                    BitmapFactory.Options options = new BitmapFactory.Options();
-                    options.inBitmap = bitmap;
-                    BitmapFactory.decodeFileDescriptor(source.getFileDescriptor(), null, options);
+                    BitmapSerializeUtils.readBitmapPixels(bitmap, source);
                 } catch (IOException|RemoteException e) {
                     Log.e(LOG_TAG, "Error rendering page:" + mPageIndex, e);
                 } finally {

packages/PrintSpooler/src/com/android/printspooler/renderer/PdfRendererService.java

@@ -32,8 +32,7 @@ import android.print.PrintAttributes.Margins;
 import android.util.Log;
 import android.view.View;
 import libcore.io.IoUtils;
-
-import java.io.FileOutputStream;
+import com.android.printspooler.util.BitmapSerializeUtils;
 import java.io.IOException;
 
 /**
@@ -76,7 +75,6 @@ public final class PdfRendererService extends Service {
         @Override
         public void renderPage(int pageIndex, int bitmapWidth, int bitmapHeight,
                 PrintAttributes attributes, ParcelFileDescriptor destination) {
-            FileOutputStream out = null;
             synchronized (mLock) {
                 try {
                     throwIfNotOpened();
@@ -136,10 +134,8 @@ public final class PdfRendererService extends Service {
 
                     page.close();
 
-                    out = new FileOutputStream(destination.getFileDescriptor());
-                    bitmap.compress(Bitmap.CompressFormat.PNG, 0, out);
+                    BitmapSerializeUtils.writeBitmapPixels(bitmap, destination);
                 } finally {
-                    IoUtils.closeQuietly(out);
                     IoUtils.closeQuietly(destination);
                 }
             }

packages/PrintSpooler/src/com/android/printspooler/util/BitmapSerializeUtils.java

@@ -0,0 +1,60 @@
+/*
+ * 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 com.android.printspooler.util;
+
+import android.graphics.Bitmap;
+import android.os.ParcelFileDescriptor;
+
+/**
+ * Helper for serialization of bitmaps in the very specific
+ * use case of having the same bitmap on both ends and just
+ * marshaling the pixels from one side to the other.
+ */
+public final class BitmapSerializeUtils {
+
+    static {
+        System.loadLibrary("printspooler_jni");
+    }
+
+    private BitmapSerializeUtils() {
+        /* do nothing */
+    }
+
+    /**
+     * Reads a bitmap pixels from a file descriptor.
+     *
+     * @param bitmap A bitmap whose pixels to populate.
+     * @param source The source file descriptor.
+     */
+    public static void readBitmapPixels(Bitmap bitmap, ParcelFileDescriptor source) {
+        nativeReadBitmapPixels(bitmap, source.getFd());
+    }
+
+    /**
+     * Writes a bitmap pixels to a file descriptor.
+     *
+     * @param bitmap The bitmap.
+     * @param destination The destination file descriptor.
+     */
+    public static void writeBitmapPixels(Bitmap bitmap, ParcelFileDescriptor destination) {
+        nativeWriteBitmapPixels(bitmap, destination.getFd());
+    }
+
+    private static native void nativeReadBitmapPixels(Bitmap bitmap, int fd);
+
+    private static native void nativeWriteBitmapPixels(Bitmap bitmap, int fd);
+}

packages/PrintSpooler/src/com/android/printspooler/widget/PageContentView.java

@@ -73,9 +73,8 @@ public class PageContentView extends View
 
     @Override
     public void onPageContentAvailable(BitmapDrawable content) {
-        if (getBackground() != content) {
-            setBackground(content);
-        }
+        assert (getBackground() != content);
+        setBackground(content);
     }
 
     public PageContentProvider getPageContentProvider() {