Move urlhandlers out of skiaserve.cpp

tools/skiaserve/urlhandlers/ClipAlphaHandler.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 "UrlHandler.h"
+
+#include "microhttpd.h"
+#include "../Request.h"
+#include "../Response.h"
+
+using namespace Response;
+
+bool ClipAlphaHandler::canHandle(const char* method, const char* url) {
+    static const char* kBasePath = "/clipAlpha/";
+    return 0 == strcmp(method, MHD_HTTP_METHOD_POST) &&
+           0 == strncmp(url, kBasePath, strlen(kBasePath));
+}
+
+int ClipAlphaHandler::handle(Request* request, MHD_Connection* connection,
+                             const char* url, const char* method,
+                             const char* upload_data, size_t* upload_data_size) {
+    SkTArray<SkString> commands;
+    SkStrSplit(url, "/", &commands);
+
+    if (!request->fPicture.get() || commands.count() != 2) {
+        return MHD_NO;
+    }
+
+    int alpha;
+    sscanf(commands[1].c_str(), "%d", &alpha);
+
+    request->fDebugCanvas->setClipVizColor(SkColorSetARGB(alpha, 0, 0, 0));
+    return SendOK(connection);
+}
+