create simple 'skpmaker' tool to generate SKP files for testing

tools/skpmaker.cpp

Index: tools/skpmaker.cpp
diff --git a/tools/skpmaker.cpp b/tools/skpmaker.cpp
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+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Simple tool to generate SKP files for testing.
+ */
+
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkCommandLineFlags.h"
+#include "SkPaint.h"
+#include "SkPicture.h"
+#include "SkScalar.h"
+#include "SkStream.h"
+
+// Flags used by this file, alphabetically:
+DEFINE_int32(blue, 128, "Value of blue color channel in image, 0-255.");
+DEFINE_int32(green, 128, "Value of green color channel in image, 0-255.");
+DEFINE_int32(height, 200, "Height of canvas to create.");
+DEFINE_int32(red, 128, "Value of red color channel in image, 0-255.");
+DEFINE_int32(width, 300, "Width of canvas to create.");
+DEFINE_string(writePath, "", "Filepath to write the SKP into.");
+
+static void skpmaker(SkScalar width, SkScalar height, SkColor color,
+                     const char *writePath) {
+    SkPicture pict;
+    SkCanvas* canvas = pict.beginRecording(width, height);
+    SkPaint paint;
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setColor(color);
+    canvas->drawRectCoords(0, 0, width, height, paint);
+    pict.endRecording();
+    SkFILEWStream stream(writePath);
+    pict.serialize(&stream);
+}
+
+int tool_main(int argc, char** argv);
+int tool_main(int argc, char** argv) {
+    SkCommandLineFlags::SetUsage("Creates a simple .skp file for testing.");
+    SkCommandLineFlags::Parse(argc, argv);
+
+    // Validate flags.
+    if ((FLAGS_blue < 0) || (FLAGS_blue > 255)) {
+        SkDebugf("--blue must be within range [0,255]\n");
+        exit(-1);
+    }
+    if ((FLAGS_green < 0) || (FLAGS_green > 255)) {
+        SkDebugf("--green must be within range [0,255]\n");
+        exit(-1);
+    }
+    if (FLAGS_height <= 0) {
+        SkDebugf("--height must be >0\n");
+        exit(-1);
+    }
+    if ((FLAGS_red < 0) || (FLAGS_red > 255)) {
+        SkDebugf("--red must be within range [0,255]\n");
+        exit(-1);
+    }
+    if (FLAGS_width <= 0) {
+        SkDebugf("--width must be >0\n");
+        exit(-1);
+    }
+    if (FLAGS_writePath.isEmpty()) {
+        SkDebugf("--writePath must be nonempty\n");
+        exit(-1);
+    }
+
+    SkColor color = SkColorSetRGB(FLAGS_red, FLAGS_green, FLAGS_blue);
+    skpmaker(SkIntToScalar(FLAGS_width), SkIntToScalar(FLAGS_height), color, FLAGS_writePath[0]);
+    return 0;
+}
+
+#if !defined SK_BUILD_FOR_IOS
+int main(int argc, char * const argv[]) {
+    return tool_main(argc, (char**) argv);
+}
+#endif