Adding a tool to get images from skps

tools/get_images_from_skps.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkCanvas.h"
+#include "SkCodec.h"
+#include "SkCommandLineFlags.h"
+#include "SkData.h"
+#include "SkOSFile.h"
+#include "SkPicture.h"
+#include "SkStream.h"
+
+DEFINE_string2(skps, s, "", "A path to a directory of skps.");
+DEFINE_string2(out, o, "", "A path to an output directory.");
+
+static int gCtr = 0;
+static int gSuccessCtr = 0;
+static int gUnknownCtr = 0;
+static int gFailureCtr = 0;
+static const char* gOutputDir;
+
+void setup_output_dirs() {
+    const char* exts[] = { "jpg", "png", "gif", "webp", "bmp", "wbmp", "ico", "dng", "unknown" };
+    for (const char* ext : exts) {
+        sk_mkdir(SkOSPath::Join(gOutputDir, ext).c_str());
+    }
+}
+
+bool store_encoded_to_file(const void* encoded, size_t length, SkBitmap* bitmap) {
+    // Silence warnings about empty bitmaps.
+    bitmap->allocN32Pixels(1, 1, true);
+
+    SkString path;
+    SkAutoTUnref<SkData> data(SkData::NewWithoutCopy(encoded, length));
+    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(data));
+    if (codec) {
+        switch (codec->getEncodedFormat()) {
+            case SkEncodedFormat::kJPEG_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "jpg").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".jpg");
+                break;
+            case SkEncodedFormat::kPNG_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "png").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".png");
+                break;
+            case SkEncodedFormat::kGIF_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "gif").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".gif");
+                break;
+            case SkEncodedFormat::kWEBP_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "webp").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".webp");
+                break;
+            case SkEncodedFormat::kBMP_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "bmp").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".bmp");
+                break;
+            case SkEncodedFormat::kWBMP_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "wbmp").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".wbmp");
+                break;
+            case SkEncodedFormat::kICO_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "ico").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".ico");
+                break;
+            case SkEncodedFormat::kRAW_SkEncodedFormat:
+                path = SkOSPath::Join(SkOSPath::Join(gOutputDir, "dng").c_str(), "");
+                path.appendS32(gCtr++);
+                path.append(".dng");
+                break;
+            default:
+                path = SkOSPath::Join(gOutputDir, "unknown");
+                path.appendS32(gUnknownCtr++);
+                break;
+        }
+    } else {
+        path = SkOSPath::Join(gOutputDir, "unknown");
+        path.appendS32(gUnknownCtr++);
+    }
+
+    FILE* file = sk_fopen(path.c_str(), kWrite_SkFILE_Flag);
+    if (file) {
+        sk_fwrite(encoded, length, file);
+        sk_fclose(file);
+        gSuccessCtr++;
+        return true;
+    }
+
+    gFailureCtr++;
+    SkDebugf("Could not open %s\n", path.c_str());
+    return false;
+}
+
+int main(int argc, char** argv) {
+    SkCommandLineFlags::SetUsage(
+            "Usage: get_images_from_skps -s <dir of skps> -o <dir for output images>\n");
+
+    SkCommandLineFlags::Parse(argc, argv);
+    if (FLAGS_skps.isEmpty() || FLAGS_out.isEmpty()) {
+        SkCommandLineFlags::PrintUsage();
+        return 1;
+    }
+
+    const char* inputs = FLAGS_skps[0];
+    gOutputDir = FLAGS_out[0];
+    if (!sk_isdir(inputs) || !sk_isdir(gOutputDir)) {
+        SkCommandLineFlags::PrintUsage();
+        return 1;
+    }
+
+    setup_output_dirs();
+    SkOSFile::Iter iter(inputs, "skp");
+    for (SkString file; iter.next(&file); ) {
+        SkAutoTDelete<SkStream> stream =
+                SkStream::NewFromFile(SkOSPath::Join(inputs, file.c_str()).c_str());
+
+        // Rather than passing in a function that actually decodes the encoded data,
+        // we pass in a function that saves the encoded data to a file.
+        SkAutoTUnref<SkPicture> picture(SkPicture::CreateFromStream(stream, store_encoded_to_file));
+
+        SkCanvas canvas;
+        canvas.drawPicture(picture);
+    }
+
+    SkDebugf("Successfully saved %d recognized images and %d unrecognized images\n", gSuccessCtr,
+            gUnknownCtr);
+    SkDebugf("Failed to write %d images\n", gFailureCtr);
+    return 0;
+}