Added Caching for PreProcessed PNGs
Added a cache management system for pre-processed PNG files
along with unit tests. The cache system will be used if
the --no-crunch flag is passed to AAPT during the package
phase. The cache can be updated by a call to 'aapt crunch'
(see usage statement). Also put in benchmarking code.
Change-Id: I58271fb2ee2f5f9075fd74d4ff6f15e7afabd05c
diff --git a/tools/aapt/CacheUpdater.h b/tools/aapt/CacheUpdater.h
new file mode 100644
index 0000000..0e65589
--- /dev/null
+++ b/tools/aapt/CacheUpdater.h
@@ -0,0 +1,107 @@
+//
+// Copyright 2011 The Android Open Source Project
+//
+// Abstraction of calls to system to make directories and delete files and
+// wrapper to image processing.
+
+#ifndef CACHE_UPDATER_H
+#define CACHE_UPDATER_H
+
+#include <utils/String8.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include "Images.h"
+
+using namespace android;
+
+/** CacheUpdater
+ * This is a pure virtual class that declares abstractions of functions useful
+ * for managing a cache files. This manager is set up to be used in a
+ * mirror cache where the source tree is duplicated and filled with processed
+ * images. This class is abstracted to allow for dependency injection during
+ * unit testing.
+ * Usage:
+ * To update/add a file to the cache, call processImage
+ * To remove a file from the cache, call deleteFile
+ */
+class CacheUpdater {
+public:
+ // Make sure all the directories along this path exist
+ virtual void ensureDirectoriesExist(String8 path) = 0;
+
+ // Delete a file
+ virtual void deleteFile(String8 path) = 0;
+
+ // Process an image from source out to dest
+ virtual void processImage(String8 source, String8 dest) = 0;
+private:
+};
+
+/** SystemCacheUpdater
+ * This is an implementation of the above virtual cache updater specification.
+ * This implementations hits the filesystem to manage a cache and calls out to
+ * the PNG crunching in images.h to process images out to its cache components.
+ */
+class SystemCacheUpdater : public CacheUpdater {
+public:
+ // Constructor to set bundle to pass to preProcessImage
+ SystemCacheUpdater (Bundle* b)
+ : bundle(b) { };
+
+ // Make sure all the directories along this path exist
+ virtual void ensureDirectoriesExist(String8 path)
+ {
+ // Check to see if we're dealing with a fully qualified path
+ String8 existsPath;
+ String8 toCreate;
+ String8 remains;
+ struct stat s;
+
+ // Check optomistically to see if all directories exist.
+ // If something in the path doesn't exist, then walk the path backwards
+ // and find the place to start creating directories forward.
+ if (stat(path.string(),&s) == -1) {
+ // Walk backwards to find place to start creating directories
+ existsPath = path;
+ do {
+ // As we remove the end of existsPath add it to
+ // the string of paths to create.
+ toCreate = existsPath.getPathLeaf().appendPath(toCreate);
+ existsPath = existsPath.getPathDir();
+ } while (stat(existsPath.string(),&s) == -1);
+
+ // Walk forwards and build directories as we go
+ do {
+ // Advance to the next segment of the path
+ existsPath.appendPath(toCreate.walkPath(&remains));
+ toCreate = remains;
+#ifdef HAVE_MS_C_RUNTIME
+ _mkdir(existsPath.string());
+#else
+ mkdir(existsPath.string(), S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP);
+#endif
+ } while (remains.length() > 0);
+ } //if
+ };
+
+ // Delete a file
+ virtual void deleteFile(String8 path)
+ {
+ if (remove(path.string()) != 0)
+ fprintf(stderr,"ERROR DELETING %s\n",path.string());
+ };
+
+ // Process an image from source out to dest
+ virtual void processImage(String8 source, String8 dest)
+ {
+ // Make sure we're trying to write to a directory that is extant
+ ensureDirectoriesExist(dest.getPathDir());
+
+ preProcessImageToCache(bundle, source, dest);
+ };
+private:
+ Bundle* bundle;
+};
+
+#endif // CACHE_UPDATER_H
\ No newline at end of file
