Revert of Sketch DM refactor.

dm/DMWriteTask.cpp

Index: dm/DMWriteTask.cpp
diff --git a/dm/DMWriteTask.cpp b/dm/DMWriteTask.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..aee43a80b87c5fbf403abb82feae4b42b43a752b
--- /dev/null
+++ b/dm/DMWriteTask.cpp
@@ -0,0 +1,189 @@
+#include "DMWriteTask.h"
+
+#include "DMJsonWriter.h"
+#include "DMUtil.h"
+#include "SkColorPriv.h"
+#include "SkCommonFlags.h"
+#include "SkData.h"
+#include "SkImageEncoder.h"
+#include "SkMD5.h"
+#include "SkMallocPixelRef.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+#include "SkString.h"
+
+DEFINE_bool(nameByHash, false, "If true, write .../hash.png instead of .../mode/config/name.png");
+
+namespace DM {
+
+// Splits off the last N suffixes of name (splitting on _) and appends them to out.
+// Returns the total number of characters consumed.
+static int split_suffixes(int N, const char* name, SkTArray<SkString>* out) {
+    SkTArray<SkString> split;
+    SkStrSplit(name, "_", &split);
+    int consumed = 0;
+    for (int i = 0; i < N; i++) {
+        // We're splitting off suffixes from the back to front.
+        out->push_back(split[split.count()-i-1]);
+        consumed += SkToInt(out->back().size() + 1);  // Add one for the _.
+    }
+    return consumed;
+}
+
+inline static SkString find_base_name(const Task& parent, SkTArray<SkString>* suffixList) {
+    const int suffixes = parent.depth() + 1;
+    const SkString& name = parent.name();
+    const int totalSuffixLength = split_suffixes(suffixes, name.c_str(), suffixList);
+    return SkString(name.c_str(), name.size() - totalSuffixLength);
+}
+
+WriteTask::WriteTask(const Task& parent, const char* sourceType, SkBitmap bitmap)
+    : CpuTask(parent)
+    , fBaseName(find_base_name(parent, &fSuffixes))
+    , fSourceType(sourceType)
+    , fBitmap(bitmap)
+    , fData(NULL)
+    , fExtension(".png") {
+}
+
+WriteTask::WriteTask(const Task& parent,
+                     const char* sourceType,
+                     SkStreamAsset *data,
+                     const char* ext)
+    : CpuTask(parent)
+    , fBaseName(find_base_name(parent, &fSuffixes))
+    , fSourceType(sourceType)
+    , fData(data)
+    , fExtension(ext) {
+    SkASSERT(fData.get());
+    SkASSERT(fData->unique());
+}
+
+void WriteTask::makeDirOrFail(SkString dir) {
+    // This can be a little racy, so if it fails check to see if someone else succeeded.
+    if (!sk_mkdir(dir.c_str()) && !sk_isdir(dir.c_str())) {
+        this->fail("Can't make directory.");
+    }
+}
+
+static SkString get_md5_string(SkMD5* hasher) {
+    SkMD5::Digest digest;
+    hasher->finish(digest);
+
+    SkString md5;
+    for (int i = 0; i < 16; i++) {
+        md5.appendf("%02x", digest.data[i]);
+    }
+    return md5;
+}
+
+static SkString get_md5(const void* ptr, size_t len) {
+    SkMD5 hasher;
+    hasher.write(ptr, len);
+    return get_md5_string(&hasher);
+}
+
+static bool write_asset(SkStreamAsset* input, SkWStream* output) {
+    return input->rewind() && output->writeStream(input, input->getLength());
+}
+
+static SkString get_md5(SkStreamAsset* stream) {
+    SkMD5 hasher;
+    write_asset(stream, &hasher);
+    return get_md5_string(&hasher);
+}
+
+static bool encode_png(const SkBitmap& src, SkFILEWStream* file) {
+    SkBitmap bm;
+    // We can't encode A8 bitmaps as PNGs.  Convert them to 8888 first.
+    if (src.info().colorType() == kAlpha_8_SkColorType) {
+        if (!src.copyTo(&bm, kN32_SkColorType)) {
+            return false;
+        }
+    } else {
+        bm = src;
+    }
+    return SkImageEncoder::EncodeStream(file, bm, SkImageEncoder::kPNG_Type, 100);
+}
+
+void WriteTask::draw() {
+    SkString md5;
+    {
+        SkAutoLockPixels lock(fBitmap);
+        md5 = fData ? get_md5(fData)
+                    : get_md5(fBitmap.getPixels(), fBitmap.getSize());
+    }
+
+    SkASSERT(fSuffixes.count() > 0);
+    SkString config = fSuffixes.back();
+    SkString mode("direct");
+    if (fSuffixes.count() > 1) {
+        mode = fSuffixes.fromBack(1);
+    }
+
+    {
+        const JsonWriter::BitmapResult entry = { fBaseName,
+                                                 config,
+                                                 mode,
+                                                 fSourceType,
+                                                 md5 };
+        JsonWriter::AddBitmapResult(entry);
+    }
+
+    SkString dir(FLAGS_writePath[0]);
+#if defined(SK_BUILD_FOR_IOS)
+    if (dir.equals("@")) {
+        dir.set(FLAGS_resourcePath[0]);
+    }
+#endif
+    this->makeDirOrFail(dir);
+
+    SkString path;
+    if (FLAGS_nameByHash) {
+        // Flat directory of hash-named files.
+        path = SkOSPath::Join(dir.c_str(), md5.c_str());
+        path.append(fExtension);
+        // We're content-addressed, so it's possible two threads race to write
+        // this file.  We let the first one win.  This also means we won't
+        // overwrite identical files from previous runs.
+        if (sk_exists(path.c_str())) {
+            return;
+        }
+    } else {
+        // Nested by mode, config, etc.
+        for (int i = 0; i < fSuffixes.count(); i++) {
+            dir = SkOSPath::Join(dir.c_str(), fSuffixes[i].c_str());
+            this->makeDirOrFail(dir);
+        }
+        path = SkOSPath::Join(dir.c_str(), fBaseName.c_str());
+        path.append(fExtension);
+        // The path is unique, so two threads can't both write to the same file.
+        // If already present we overwrite here, since the content may have changed.
+    }
+
+    SkFILEWStream file(path.c_str());
+    if (!file.isValid()) {
+        return this->fail("Can't open file.");
+    }
+
+    bool ok = fData ? write_asset(fData, &file)
+                    : encode_png(fBitmap, &file);
+    if (!ok) {
+        return this->fail("Can't write to file.");
+    }
+}
+
+SkString WriteTask::name() const {
+    SkString name("writing ");
+    for (int i = 0; i < fSuffixes.count(); i++) {
+        name.appendf("%s/", fSuffixes[i].c_str());
+    }
+    name.append(fBaseName.c_str());
+    return name;
+}
+
+bool WriteTask::shouldSkip() const {
+    return FLAGS_writePath.isEmpty();
+}
+
+}  // namespace DM