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      1 /*
      2  * Copyright 2016 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "UrlHandler.h"
      9 
     10 #include "microhttpd.h"
     11 #include "../Request.h"
     12 #include "../Response.h"
     13 
     14 using namespace Response;
     15 
     16 bool BreakHandler::canHandle(const char* method, const char* url) {
     17     static const char* kBasePath = "/break";
     18     return 0 == strcmp(method, MHD_HTTP_METHOD_GET) &&
     19            0 == strncmp(url, kBasePath, strlen(kBasePath));
     20 }
     21 
     22 int BreakHandler::handle(Request* request, MHD_Connection* connection,
     23                          const char* url, const char* method,
     24                          const char* upload_data, size_t* upload_data_size) {
     25     SkTArray<SkString> commands;
     26     SkStrSplit(url, "/", &commands);
     27 
     28     if (!request->hasPicture() || commands.count() != 4) {
     29         return MHD_NO;
     30     }
     31 
     32     // /break/<n>/<x>/<y>
     33     int n;
     34     sscanf(commands[1].c_str(), "%d", &n);
     35     int x;
     36     sscanf(commands[2].c_str(), "%d", &x);
     37     int y;
     38     sscanf(commands[3].c_str(), "%d", &y);
     39 
     40     int count = request->fDebugCanvas->getSize();
     41     SkASSERT(n < count);
     42 
     43     SkCanvas* canvas = request->getCanvas();
     44     canvas->clear(SK_ColorWHITE);
     45     int saveCount = canvas->save();
     46     for (int i = 0; i <= n; ++i) {
     47         request->fDebugCanvas->getDrawCommandAt(i)->execute(canvas);
     48     }
     49     SkColor target = request->getPixel(x, y);
     50 
     51     SkDynamicMemoryWStream stream;
     52     SkJSONWriter writer(&stream, SkJSONWriter::Mode::kFast);
     53     writer.beginObject(); // root
     54 
     55     writer.appendName("startColor"); SkDrawCommand::MakeJsonColor(writer, target);
     56 
     57     bool changed = false;
     58     for (int i = n + 1; i < n + count; ++i) {
     59         int index = i % count;
     60         if (index == 0) {
     61             // reset canvas for wraparound
     62             canvas->restoreToCount(saveCount);
     63             canvas->clear(SK_ColorWHITE);
     64             saveCount = canvas->save();
     65         }
     66         request->fDebugCanvas->getDrawCommandAt(index)->execute(canvas);
     67         SkColor current = request->getPixel(x, y);
     68         if (current != target) {
     69             writer.appendName("endColor"); SkDrawCommand::MakeJsonColor(writer, current);
     70             writer.appendS32("endOp", index);
     71             changed = true;
     72             break;
     73         }
     74     }
     75     if (!changed) {
     76         writer.appendName("endColor"); SkDrawCommand::MakeJsonColor(writer, target);
     77         writer.appendS32("endOp", n);
     78     }
     79     canvas->restoreToCount(saveCount);
     80 
     81     writer.endObject(); // root
     82     writer.flush();
     83     return SendData(connection, stream.detachAsData().get(), "application/json");
     84 }
     85