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-rw-r--r--libs/hwui/DisplayListLogBuffer.cpp112
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diff --git a/libs/hwui/DisplayListLogBuffer.cpp b/libs/hwui/DisplayListLogBuffer.cpp
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-/*
- * Copyright (C) 2011 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 "DisplayListLogBuffer.h"
-
-// BUFFER_SIZE size must be one more than a multiple of COMMAND_SIZE to ensure
-// that mStart always points at the next command, not just the next item
-#define NUM_COMMANDS 50
-#define BUFFER_SIZE ((NUM_COMMANDS) + 1)
-
-/**
- * DisplayListLogBuffer is a utility class which logs the most recent display
- * list operations in a circular buffer. The log is process-wide, because we
- * only care about the most recent operations, not the operations on a per-window
- * basis for a given activity. The purpose of the log is to provide more debugging
- * information in a bug report, by telling us not just where a process hung (which
- * generally is just reported as a stack trace at the Java level) or crashed, but
- * also what happened immediately before that hang or crash. This may help track down
- * problems in the native rendering code or driver interaction related to the display
- * list operations that led up to the hang or crash.
- *
- * The log is implemented as a circular buffer for both space and performance
- * reasons - we only care about the last several operations to give us context
- * leading up to the problem, and we don't want to constantly copy data around or do
- * additional mallocs to keep the most recent operations logged. Only numbers are
- * logged to make the operation fast. If and when the log is output, we process this
- * data into meaningful strings.
- *
- * There is an assumption about the format of the command (currently 2 ints: the
- * opcode and the nesting level). If the type of information logged changes (for example,
- * we may want to save a timestamp), then the size of the buffer and the way the
- * information is recorded in writeCommand() should change to suit.
- */
-
-namespace android {
-
-#ifdef USE_OPENGL_RENDERER
-using namespace uirenderer;
-ANDROID_SINGLETON_STATIC_INSTANCE(DisplayListLogBuffer);
-#endif
-
-namespace uirenderer {
-
-
-DisplayListLogBuffer::DisplayListLogBuffer() {
- mBufferFirst = (OpLog*) malloc(BUFFER_SIZE * sizeof(OpLog));
- mStart = mBufferFirst;
- mBufferLast = mBufferFirst + BUFFER_SIZE - 1;
- mEnd = mStart;
-}
-
-DisplayListLogBuffer::~DisplayListLogBuffer() {
- free(mBufferFirst);
-}
-
-/**
- * Called from DisplayListRenderer to output the current buffer into the
- * specified FILE. This only happens in a dumpsys/bugreport operation.
- */
-void DisplayListLogBuffer::outputCommands(FILE *file)
-{
- OpLog* tmpBufferPtr = mStart;
- while (true) {
- if (tmpBufferPtr == mEnd) {
- break;
- }
-
- fprintf(file, "%*s%s\n", 2 * tmpBufferPtr->level, "", tmpBufferPtr->label);
-
- tmpBufferPtr++;
- if (tmpBufferPtr > mBufferLast) {
- tmpBufferPtr = mBufferFirst;
- }
- }
-}
-
-/**
- * Store the given level and label in the buffer and increment/wrap the mEnd
- * and mStart values as appropriate. Label should point to static memory.
- */
-void DisplayListLogBuffer::writeCommand(int level, const char* label) {
- mEnd->level = level;
- mEnd->label = label;
-
- if (mEnd == mBufferLast) {
- mEnd = mBufferFirst;
- } else {
- mEnd++;
- }
- if (mEnd == mStart) {
- mStart++;
- if (mStart > mBufferLast) {
- mStart = mBufferFirst;
- }
- }
-}
-
-}; // namespace uirenderer
-}; // namespace android