add support for skfiddle width/height options

experimental/webtry/main.cpp

 #include <sys/time.h>
 #include <sys/resource.h>
 
 #include "SkCanvas.h"
 #include "SkCommandLineFlags.h"
 #include "SkData.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkImageInfo.h"
+#include "SkOSFile.h"
 #include "SkStream.h"
 #include "SkSurface.h"
 
 #include "seccomp_bpf.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
 DEFINE_string(out, "", "Filename of the PNG to write to.");
 DEFINE_string(source, "", "Filename of the source image.");
+DEFINE_int32(width, 256, "Width of output image.");
+DEFINE_int32(height, 256, "Height of output image.");
 
 // Defined in template.cpp.
 extern SkBitmap source;
 
 static bool install_syscall_filter() {
 
 #ifndef SK_UNSAFE_BUILD_DESKTOP_ONLY
     struct sock_filter filter[] = {
         /* Grab the system call number. */
         EXAMINE_SYSCALL,
@@ skipping 64 matching lines @@
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     SkAutoGraphics init;
 
     if (FLAGS_out.count() == 0) {
       perror("The --out flag must have an argument.");
       return 1;
     }
 
     if (FLAGS_source.count() == 1) {
-       if (!SkImageDecoder::DecodeFile(FLAGS_source[0], &source)) {
-           perror("Unable to read the source image.");
-       }
+        const char *sourceDir = getenv("WEBTRY_INOUT");
+        if (NULL == sourceDir) {
+            sourceDir = "/skia_build/inout";
+        }
+
+        SkString sourcePath = SkOSPath::Join(sourceDir, FLAGS_source[0]);
+        if (!SkImageDecoder::DecodeFile(sourcePath.c_str(), &source)) {
+            perror("Unable to read the source image.");
+        }
     }
 
     SkFILEWStream stream(FLAGS_out[0]);
 
-    SkImageInfo info = SkImageInfo::MakeN32(256, 256, kPremul_SkAlphaType);
+    SkImageInfo info = SkImageInfo::MakeN32(FLAGS_width, FLAGS_height, kPremul_SkAlphaType);
     SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(info));
     SkCanvas* canvas = surface->getCanvas();
 
     setLimits();
 
     if (!install_syscall_filter()) {
         return 1;
     }
 
     draw(canvas);
 
     // Write out the image as a PNG.
     SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
     SkAutoTUnref<SkData> data(image->encode(SkImageEncoder::kPNG_Type, 100));
     if (NULL == data.get()) {
         printf("Failed to encode\n");
         exit(1);
     }
     stream.write(data->data(), data->size());
 }