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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.
*/
#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;
}
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