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

1 files changed, 192 insertions, 0 deletions

diff --git a/packages/PrintSpooler/jni/com_android_printspooler_util_BitmapSerializeUtils.cpp b/packages/PrintSpooler/jni/com_android_printspooler_util_BitmapSerializeUtils.cpp
new file mode 100644
index 0000000..57281c8
--- /dev/null
+++ b/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;
+}