added clip visualization to skiaserve

tools/skiaserve/skiaserve.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 "GrCaps.h"
 #include "GrContextFactory.h"
 #include "SkCanvas.h"
@@ skipping 214 matching lines @@
         SkStrSplit(url, "/", &commands);
 
         if (!request->fPicture.get() || commands.count() > 3) {
             return MHD_NO;
         }
 
         // /cmd or /cmd/N
         if (0 == strcmp(method, MHD_HTTP_METHOD_GET)) {
             int n;
             if (commands.count() == 1) {
-                n = request->fDebugCanvas->getSize();
+                n = request->fDebugCanvas->getSize() - 1;
             } else {
                 sscanf(commands[1].c_str(), "%d", &n);
             }
             return SendJSON(connection, request->fDebugCanvas, &request->fUrlDataManager, n);
         }
 
         // /cmd/N, for now only delete supported
         if (commands.count() == 2 && 0 == strcmp(method, MHD_HTTP_METHOD_DELETE)) {
             int n;
             sscanf(commands[1].c_str(), "%d", &n);
@@ skipping 38 matching lines @@
             n = request->fDebugCanvas->getSize() - 1;
         } else {
             sscanf(commands[1].c_str(), "%d", &n);
         }
 
         SkAutoTUnref<SkData> data(setupAndDrawToCanvasReturnPng(request, n));
         return SendData(connection, data, "image/png");
     }
 };
 
+/**
+   Updates the clip visualization alpha. On all subsequent /img requests, the clip will be drawn in
+   black with the specified alpha. 0 = no visible clip, 255 = fully opaque clip.
+ */
+class ClipAlphaHandler : public UrlHandler {
+public:
+    bool canHandle(const char* method, const char* url) override {
+        static const char* kBasePath = "/clipAlpha/";
+        return 0 == strcmp(method, MHD_HTTP_METHOD_GET) &&
+               0 == strncmp(url, kBasePath, strlen(kBasePath));
+    }
+
+    int handle(Request* request, MHD_Connection* connection,
+               const char* url, const char* method,
+               const char* upload_data, size_t* upload_data_size) override {
+        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);
+    }
+};
+
 class PostHandler : public UrlHandler {
 public:
     bool canHandle(const char* method, const char* url) override {
         return 0 == strcmp(method, MHD_HTTP_METHOD_POST) &&
                0 == strcmp(url, "/new");
     }
 
     int handle(Request* request, MHD_Connection* connection,
                const char* url, const char* method,
                const char* upload_data, size_t* upload_data_size) override {
@@ skipping 197 matching lines @@
     }
 };
 
 class UrlManager {
 public:
     UrlManager() {
         // Register handlers
         fHandlers.push_back(new RootHandler);
         fHandlers.push_back(new PostHandler);
         fHandlers.push_back(new ImgHandler);
+        fHandlers.push_back(new ClipAlphaHandler);
         fHandlers.push_back(new CmdHandler);
         fHandlers.push_back(new InfoHandler);
         fHandlers.push_back(new DownloadHandler);
         fHandlers.push_back(new DataHandler);
         fHandlers.push_back(new FaviconHandler);
     }
 
     ~UrlManager() {
         for (int i = 0; i < fHandlers.count(); i++) { delete fHandlers[i]; }
     }
@@ skipping 46 matching lines @@
     MHD_stop_daemon(daemon);
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return skiaserve_main();
 }
 #endif