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

tools/skpmaker.cpp

+/*
+ * Copyright 2013 Google Inc.

[rmistry, 2014/01/02 16:29:35]

2014 :) 

[epoger, 2014/01/02 16:40:30]

Thanks, Ryan Seacrest!  Fixed.

+ *
+ * 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

[rmistry, 2014/01/02 16:29:35]

What does this section mean? Define main only if it is not an iOS build?

[epoger, 2014/01/02 16:40:30]

I suppose so.  I just copied this from other code in the tools dir...

epoger@wpgntat-ubiq141:~/src/skia/red/skia/tools$ grep --after-context=2
SK_BUILD_FOR_IOS *.cpp
bbh_shootout.cpp:#if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
bbh_shootout.cpp-int main(int argc, char** argv) {
bbh_shootout.cpp-    return tool_main(argc, argv);
--
bench_pictures_main.cpp:#if !defined SK_BUILD_FOR_IOS
bench_pictures_main.cpp-int main(int argc, char * const argv[]) {
bench_pictures_main.cpp-    return tool_main(argc, (char**) argv);
--
filtermain.cpp:#if !defined SK_BUILD_FOR_IOS
filtermain.cpp-int main(int argc, char * const argv[]) {
filtermain.cpp-    return tool_main(argc, (char**) argv);
--
pinspect.cpp:#if !defined SK_BUILD_FOR_IOS
pinspect.cpp-int main(int argc, char * const argv[]) {
pinspect.cpp-    return tool_main(argc, (char**) argv);
--
render_pdfs_main.cpp:#if !defined SK_BUILD_FOR_IOS
render_pdfs_main.cpp-int main(int argc, char * const argv[]) {
render_pdfs_main.cpp-    return tool_main(argc, (char**) argv);
--
render_pictures_main.cpp:#if !defined SK_BUILD_FOR_IOS
render_pictures_main.cpp-int main(int argc, char * const argv[]) {
render_pictures_main.cpp-    return tool_main(argc, (char**) argv);
--
skdiff_image.cpp:#if !defined SK_BUILD_FOR_IOS
skdiff_image.cpp-int main(int argc, char * const argv[]) {
skdiff_image.cpp-    return tool_main(argc, (char**) argv);
--
skdiff_main.cpp:#if !defined SK_BUILD_FOR_IOS
skdiff_main.cpp-int main(int argc, char * const argv[]) {
skdiff_main.cpp-    return tool_main(argc, (char**) argv);
--
skhello.cpp:#if !defined SK_BUILD_FOR_IOS
skhello.cpp-int main(int argc, char * const argv[]) {
skhello.cpp-    return tool_main(argc, (char**) argv);
--
skimage_main.cpp:#if !defined SK_BUILD_FOR_IOS
skimage_main.cpp-int main(int argc, char * const argv[]) {
skimage_main.cpp-    return tool_main(argc, (char**) argv);
--
skpmaker.cpp:#if !defined SK_BUILD_FOR_IOS
skpmaker.cpp-int main(int argc, char * const argv[]) {
skpmaker.cpp-    return tool_main(argc, (char**) argv);
--
test_image_decoder.cpp:#if !defined SK_BUILD_FOR_IOS
test_image_decoder.cpp-int main(int argc, char * const argv[]) {
test_image_decoder.cpp-    return tool_main(argc, (char**) argv);

[mtklein, 2014/01/02 17:25:35]

Yeah, this is just the weird way we trampoline into our apps on iOS. 
experimental/SimpleiOSApp/SimpleApp.mm has the glue if you're interested.

+int main(int argc, char * const argv[]) {
+    return tool_main(argc, (char**) argv);
+}
+#endif