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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 "SkColor.h"
      9 
     10 struct MHD_Connection;
     11 struct Request;
     12 
     13 class UrlHandler {
     14 public:
     15     virtual ~UrlHandler() {}
     16     virtual bool canHandle(const char* method, const char* url) = 0;
     17     virtual int handle(Request* request, MHD_Connection* connection,
     18                        const char* url, const char* method,
     19                        const char* upload_data, size_t* upload_data_size) = 0;
     20 };
     21 
     22 class CmdHandler : public UrlHandler {
     23 public:
     24     bool canHandle(const char* method, const char* url) override;
     25     int handle(Request* request, MHD_Connection* connection,
     26                const char* url, const char* method,
     27                const char* upload_data, size_t* upload_data_size) override;
     28 };
     29 
     30 class ImgHandler : public UrlHandler {
     31 public:
     32     bool canHandle(const char* method, const char* url) override;
     33     int handle(Request* request, MHD_Connection* connection,
     34                const char* url, const char* method,
     35                const char* upload_data, size_t* upload_data_size) override;
     36 };
     37 
     38 class BreakHandler : public UrlHandler {
     39 public:
     40     bool canHandle(const char* method, const char* url) override;
     41     int handle(Request* request, MHD_Connection* connection,
     42                const char* url, const char* method,
     43                const char* upload_data, size_t* upload_data_size) override;
     44 private:
     45     static SkColor GetPixel(Request* request, int x, int y);
     46 };
     47 
     48 /**
     49    Updates the clip visualization alpha. On all subsequent /img requests, the clip will be drawn in
     50    black with the specified alpha. 0 = no visible clip, 255 = fully opaque clip.
     51  */
     52 class ClipAlphaHandler : public UrlHandler {
     53 public:
     54     bool canHandle(const char* method, const char* url) override;
     55     int handle(Request* request, MHD_Connection* connection,
     56                const char* url, const char* method,
     57                const char* upload_data, size_t* upload_data_size) override;
     58 };
     59 
     60 /**
     61    Controls whether GPU rendering is enabled. Posting to /enableGPU/1 turns GPU on, /enableGPU/0
     62    disables it.
     63  */
     64 class EnableGPUHandler : public UrlHandler {
     65 public:
     66     bool canHandle(const char* method, const char* url) override;
     67     int handle(Request* request, MHD_Connection* connection,
     68                const char* url, const char* method,
     69                const char* upload_data, size_t* upload_data_size) override;
     70 };
     71 
     72 class PostHandler : public UrlHandler {
     73 public:
     74     bool canHandle(const char* method, const char* url) override;
     75     int handle(Request* request, MHD_Connection* connection,
     76                const char* url, const char* method,
     77                const char* upload_data, size_t* upload_data_size) override;
     78 };
     79 
     80 class DownloadHandler : public UrlHandler {
     81 public:
     82     bool canHandle(const char* method, const char* url) override;
     83     int handle(Request* request, MHD_Connection* connection,
     84                const char* url, const char* method,
     85                const char* upload_data, size_t* upload_data_size) override;
     86 };
     87 
     88 class InfoHandler : public UrlHandler {
     89 public:
     90     bool canHandle(const char* method, const char* url) override;
     91     int handle(Request* request, MHD_Connection* connection,
     92                const char* url, const char* method,
     93                const char* upload_data, size_t* upload_data_size) override;
     94 };
     95 
     96 class DataHandler : public UrlHandler {
     97 public:
     98     bool canHandle(const char* method, const char* url) override;
     99     int handle(Request* request, MHD_Connection* connection,
    100                const char* url, const char* method,
    101                const char* upload_data, size_t* upload_data_size) override;
    102 };
    103 
    104 class RootHandler : public UrlHandler {
    105 public:
    106     bool canHandle(const char* method, const char* url) override;
    107     int handle(Request* request, MHD_Connection* connection,
    108                const char* url, const char* method,
    109                const char* upload_data, size_t* upload_data_size) override;
    110 };
    111 
    112