Added screenshot feature

lib/obp60task/OBP60Extensions.cpp

@@ -11,6 +11,7 @@
 #include "Pagedata.h"
 #include "OBP60Hardware.h"
 #include "OBP60Extensions.h"
+#include "imglib.h"
 
 // Character sets
 #include "Ubuntu_Bold8pt7b.h"
@@ -404,4 +405,44 @@ void generatorGraphic(uint x, uint y, int pcolor, int bcolor){
         getdisplay().print("G");
 }
 
+// Function to handle HTTP image request
+void doImageRequest(GwApi *api, int *pageno, const PageStruct pages[MAX_PAGE_NUMBER], AsyncWebServerRequest *request) {
+    GwLog *logger = api->getLogger();
+
+    String imgformat = api->getConfig()->getConfigItem(api->getConfig()->imageFormat,true)->asString();
+    imgformat.toLowerCase();
+    String filename = "Page" + String(*pageno) + "_" +  pages[*pageno].description->pageName + "." + imgformat;
+
+    logger->logDebug(GwLog::LOG,"handle image request [%s]: %s", imgformat, filename);
+
+    uint8_t *fb = getdisplay().getBuffer(); // EPD framebuffer
+    std::vector<uint8_t> imageBuffer;       // image in webserver transferbuffer
+    String mimetype;
+
+    if (imgformat == "gif") {
+        // GIF is commpressed with LZW, so small
+        mimetype = "image/gif";
+        if (!createGIF(fb, &imageBuffer, GxEPD_WIDTH, GxEPD_HEIGHT)) {
+             logger->logDebug(GwLog::LOG,"GIF creation failed: Hashtable init error!");
+             return;
+        }
+    }
+    else if (imgformat == "bmp") {
+        // Microsoft BMP bitmap
+        mimetype = "image/bmp";
+        createBMP(fb, &imageBuffer, GxEPD_WIDTH, GxEPD_HEIGHT);
+    }
+    else {
+        // PBM simple portable bitmap
+        mimetype = "image/x-portable-bitmap";
+        createPBM(fb, &imageBuffer, GxEPD_WIDTH, GxEPD_HEIGHT);
+    }
+
+    AsyncWebServerResponse *response = request->beginResponse_P(200, mimetype, (const uint8_t*)imageBuffer.data(), imageBuffer.size());
+    response->addHeader("Content-Disposition", "inline; filename=" + filename);
+    request->send(response);
+
+    imageBuffer.clear();
+}
+
 #endif

lib/obp60task/OBP60Extensions.h

@@ -70,4 +70,6 @@ void solarGraphic(uint x, uint y, int pcolor, int bcolor);                  // S
 void generatorGraphic(uint x, uint y, int pcolor, int bcolor);              // Generator graphic with fill level
 void startLedTask(GwApi *api);
 
+void doImageRequest(GwApi *api, int *pageno, const PageStruct pages[MAX_PAGE_NUMBER], AsyncWebServerRequest *request);
+
 #endif

lib/obp60task/OBP60Hardware.h

@@ -39,11 +39,6 @@
     #define OBP_SPI_DIN 48
     #define SHOW_TIME 6000        // Show time in [ms] for logo and WiFi QR code
     #define FULL_REFRESH_TIME 600 // Refresh cycle time in [s][600...3600] for full display update (very important healcy function)
-    #define MAX_PAGE_NUMBER 10    // Max number of pages for show data
-    #define FONT1 "Ubuntu_Bold8pt7b"
-    #define FONT2 "Ubuntu_Bold24pt7b"
-    #define FONT3 "Ubuntu_Bold32pt7b"
-    #define FONT4 "DSEG7Classic_BoldItalic80pt7b"
 
     // GPS (NEO-6M, NEO-M8N, ATGM336H)
     #define OBP_GPS_RX 2

lib/obp60task/Pagedata.h

@@ -4,6 +4,8 @@
 #include <functional>
 #include <vector>
 
+#define MAX_PAGE_NUMBER 10    // Max number of pages for show data
+
 typedef std::vector<GwApi::BoatValue *> ValueList;
 typedef struct{
   String pageName;
@@ -114,6 +116,13 @@ class PageDescription{
         }
 };
 
+class PageStruct{
+    public:
+        Page *page=NULL;
+        PageData parameters;
+        PageDescription *description=NULL;
+};
+
 // Structure for formated boat values
 typedef struct{
   double value;

lib/obp60task/config.json

@@ -898,6 +898,22 @@
             "obp60":"true"
         }
     },
+    {
+        "name": "imageFormat",
+        "label": "Screenshot Format",
+        "type": "list",
+        "default":"PBM",
+        "description": "Graphics file format for screenshots [GIF|PBM|BMP]",
+        "list": [
+            {"l":"Compressed image (GIF)","v":"GIF"},
+            {"l":"Portable bitmap (PBM)","v":"PBM"},
+            {"l":"Windows bitmap (BMP)","v":"BMP"}
+        ],
+        "category":"OBP60 Pages",
+        "capabilities": {
+            "obp60":"true"
+        }
+    },
     {
         "name": "page1type",
         "label": "Type",

lib/obp60task/obp60task.cpp

@@ -183,13 +183,6 @@ class PageList{
         }
 };
 
-class PageStruct{
-    public:
-        Page *page=NULL;
-        PageData parameters;
-        PageDescription *description=NULL;
-};
-
 /**
  * this function will add all the pages we know to the pagelist
  * each page should have defined a registerXXXPage variable of type
@@ -353,6 +346,10 @@ void OBP60Task(GwApi *api){
     // Init pages
     int numPages=1;
     PageStruct pages[MAX_PAGE_NUMBER];
+    // Set start page
+    int pageNumber = int(api->getConfig()->getConfigItem(api->getConfig()->startPage,true)->asInt()) - 1;
+    int lastPage=pageNumber;
+
     BoatValueList boatValues; //all the boat values for the api query
     //commonData.distanceformat=config->getString(xxx);
     //add all necessary data to common data
@@ -395,6 +392,11 @@ void OBP60Task(GwApi *api){
             pages[i].parameters.values.push_back(value); 
        }
     }
+
+    api->registerRequestHandler("screenshot", [api, &pageNumber, pages](AsyncWebServerRequest *request) {
+        doImageRequest(api, &pageNumber, pages, request);
+    });
+
     //now we have prepared the page data
     //we start a separate task that will fetch our keys...
     MyData allParameters;
@@ -431,9 +433,6 @@ void OBP60Task(GwApi *api){
     GwApi::BoatValue *hdop = boatValues.findValueOrCreate("HDOP");       // Load GpsHDOP
 
     LOG_DEBUG(GwLog::LOG,"obp60task: start mainloop");
-    // Set start page
-    int pageNumber = int(api->getConfig()->getConfigItem(api->getConfig()->startPage,true)->asInt()) - 1;
-    int lastPage=pageNumber;
     
     commonData.time = boatValues.findValueOrCreate("GPST");      // Load GpsTime
     commonData.date = boatValues.findValueOrCreate("GPSD");      // Load GpsTime

lib/obp60task/platformio.ini

@@ -23,8 +23,9 @@ lib_deps =
     blemasle/MCP23017@2.0.0
     adafruit/Adafruit BusIO@1.5.0
     adafruit/Adafruit GFX Library@1.11.9
-    zinggjm/GxEPD2@1.5.8
+    #zinggjm/GxEPD2@1.5.8
     #https://github.com/ZinggJM/GxEPD2
+    https://github.com/thooge/GxEPD2
     sstaub/Ticker@4.4.0
     adafruit/Adafruit BMP280 Library@2.6.2
     adafruit/Adafruit BME280 Library@2.2.2