Add web JPEG support

Inkplate.cpp

@@ -538,7 +538,7 @@ int Inkplate::drawBitmapFromWeb(char *url, int x, int y, bool dither, bool inver
 
 int Inkplate::drawJpegFromSD(Inkplate *display, SdFile *p, int x, int y, bool dither, bool invert)
 {
-    uint16_t w = 0, h = 0;
+    uint8_t ret = 0;
 
     TJpgDec.setJpgScale(1);
     TJpgDec.setCallback(jpegCallback);
@@ -559,13 +559,14 @@ int Inkplate::drawJpegFromSD(Inkplate *display, SdFile *p, int x, int y, bool di
     }
     p->close();
 
-    //TJpgDec.getJpgSize(&w, &h, buf, total);
-    //Serial.print("Width = "); Serial.print(w); Serial.print(", height = "); Serial.println(h);
     selectDisplayMode(INKPLATE_3BIT);
 
-    TJpgDec.drawJpg(x, y, buf, total, display);
+    if(TJpgDec.drawJpg(x, y, buf, total, display) == 0)
+      ret = 1;
 
     free(buf);
+
+    return ret;
 }
 
 int Inkplate::drawJpegFromSD(Inkplate *display, char *fileName, int x, int y, bool dither, bool invert)
@@ -583,6 +584,67 @@ int Inkplate::drawJpegFromSD(Inkplate *display, char *fileName, int x, int y, bo
     }
 }
 
+int Inkplate::drawJpegFromWeb(Inkplate *display, WiFiClient *s, int x, int y, int len, bool dither, bool invert)
+{
+    uint8_t ret = 0;
+
+    TJpgDec.setJpgScale(1);
+    TJpgDec.setCallback(jpegCallback);
+
+    uint32_t pnt = 0;
+    uint8_t *buf = (uint8_t *)ps_malloc(len);
+    if (buf == NULL)
+        return 0;
+
+    while (pnt < len) {
+        uint32_t toread = s->available();
+        if (toread > 0) {
+            int read = s->read(buf + pnt, toread);
+            if (read > 0)
+                pnt += read;
+        }
+    }
+
+    selectDisplayMode(INKPLATE_3BIT);
+
+    if(TJpgDec.drawJpg(x, y, buf, len, display) == 0)
+      ret = 1;
+
+    free(buf);
+
+    return ret;
+}
+
+int Inkplate::drawJpegFromWeb(Inkplate *display, char *url, int x, int y, bool dither, bool invert)
+{
+    if (WiFi.status() != WL_CONNECTED)
+        return 0;
+    int ret = 0;
+
+    bool sleep = WiFi.getSleep();
+    WiFi.setSleep(false);
+
+    HTTPClient http;
+    http.getStream().setNoDelay(true);
+    http.getStream().setTimeout(1);
+    http.begin(url);
+
+    int httpCode = http.GET();
+    if (httpCode == 200)
+    {
+        int32_t len = http.getSize();
+        if (len > 0)
+        {
+            WiFiClient *dat = http.getStreamPtr();
+            ret = drawJpegFromWeb(display, dat, x, y, len, dither, invert);
+        }
+    }
+
+    http.end();
+    WiFi.setSleep(sleep);
+    return ret;
+}
+
 void Inkplate::drawElipse(int rx, int ry,
                           int xc, int yc,
                           int c)

Inkplate.h

@@ -233,12 +233,14 @@ public:
     void einkOn(void);
     void selectDisplayMode(uint8_t _mode);
     uint8_t getDisplayMode();
-    int drawBitmapFromSD(SdFile *p, int x, int y, bool dither = false, bool invert = false);
+    int drawBitmapFromSD(SdFile *p, int x, int y, bool invert = false, bool dither = false);
-    int drawBitmapFromSD(char *fileName, int x, int y, bool dither = false, bool invert = false);
+    int drawBitmapFromSD(char *fileName, int x, int y, bool invert = false, bool dither = false);
-    int drawBitmapFromWeb(WiFiClient *s, int x, int y, int len, bool dither = false, bool invert = false);
+    int drawBitmapFromWeb(WiFiClient *s, int x, int y, int len, bool invert = false, bool dither = false);
-    int drawBitmapFromWeb(char *url, int x, int y, bool dither = false, bool invert = false);
+    int drawBitmapFromWeb(char *url, int x, int y, bool invert = false, bool dither = false);
-    int drawJpegFromSD(Inkplate *display, SdFile *p, int x, int y, bool dither = false, bool invert = false);
+    int drawJpegFromSD(Inkplate *display, SdFile *p, int x, int y, bool invert = false, bool dither = false);
-    int drawJpegFromSD(Inkplate *display, char *fileName, int x, int y, bool dither = false, bool invert = false);
+    int drawJpegFromSD(Inkplate *display, char *fileName, int x, int y, bool invert = false, bool dither = false);
+    int drawJpegFromWeb(Inkplate *display, WiFiClient *s, int x, int y, int len, bool invert = false, bool dither = false);
+    int drawJpegFromWeb(Inkplate *display, char *url, int x, int y, bool invert = false, bool dither = false);
     void drawElipse(int rx, int ry, int xc, int yc, int c);
     void fillElipse(int rx, int ry, int xc, int yc, int c);
     void drawPolygon(int *x, int *y, int n, int color);

examples/2. Advanced Inkplate Features/11-Inkplate_SD_JPEG_pictures/11-Inkplate_SD_JPEG_pictures.ino

@@ -38,11 +38,13 @@ void setup() {
         display.partialUpdate();
 
         //If card is properly init, try to load image and display it on e-paper at position X=100, Y=0
-        //NOTE: Both drawJpegFromSD methods allow for an optional fourth "invert" parameter. Setting this parameter to true
+        //NOTE: These methods require you to pass a reference to the display object as first parameter.
+        //NOTE: Both drawJpegFromSD methods allow for an optional fifth "invert" parameter. Setting this parameter to true
         //will flip all colors on the image, making black white and white black.
-        if (!display.drawJpegFromSD(&display, "pyramid.jpg", 100, 0, 0, 1)) {
+        //Sixth parameter will dither the image.
+        if (!display.drawJpegFromSD(&display, "pyramid.jpg", 100, 0, false, true)) {
             //If is something failed (wrong filename or wrong format), write error message on the screen.
-            //You can turn off dithering for somewhat faster image load by changing the last 1 to 0, or removing the 1 argument completely
+            //You can turn off dithering for somewhat faster image load by changing the last true to false, or removing the argument completely
             display.println("Image open error");
             display.display();
         }

examples/2. Advanced Inkplate Features/12-Inkplate_Web_JPEG_pictures/12-Inkplate_Web_JPEG_pictures.ino

@@ -0,0 +1,62 @@
+/*
+   12-Inkplate_Web_JPEG_pictures for e-radionica Inkplate6
+   For this example you will need a micro USB cable, Inkplate6, and an available WiFi connection.
+   Select "Inkplate 6(ESP32)" from Tools -> Board menu.
+   Don't have "Inkplate 6(ESP32)" option? Follow our tutorial and add it:
+   https://e-radionica.com/en/blog/add-inkplate-6-to-arduino-ide/
+
+   You can open .jpg files that have resoluton smaller than 800x600 or otherwise it won't fit on screen.
+
+   This example will show you how you can download a .jpg file (picture) from the web and
+   display that image on e-paper display.
+
+   Want to learn more about Inkplate? Visit www.inkplate.io
+   Looking to get support? Write on our forums: http://forum.e-radionica.com/en/
+   31 August 2020 by e-radionica.com
+*/
+
+#include "Inkplate.h"               //Include Inkplate library to the sketch
+#include "HTTPClient.h"             //Include library for HTTPClient
+#include "WiFi.h"                   //Include library for WiFi
+Inkplate display(INKPLATE_1BIT);    //Create an object on Inkplate library and also set library into 1 Bit mode (Monochrome)
+
+const char* ssid     = "Twilight Sparkle"; //Your WiFi SSID
+const char* password = "thori4twily"; //Your WiFi password
+
+void setup() {
+    display.begin();        //Init Inkplate library (you should call this function ONLY ONCE)
+    display.clearDisplay(); //Clear frame buffer of display
+    display.display();      //Put clear image on display
+
+    display.print("Connecting to WiFi...");
+    display.partialUpdate();
+
+    //Connect to the WiFi network.
+    WiFi.mode(WIFI_MODE_STA);
+    WiFi.begin(ssid, password);
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+        display.print(".");
+        display.partialUpdate();
+    }
+    display.println("\nWiFi OK! Downloading...");
+    display.partialUpdate();
+
+    //Try to load image and display it on e-paper at position X=0, Y=100
+    //NOTE: These methods require you to pass a reference to the display object as first parameter.
+    //NOTE: Both drawJpegFromWeb methods allow for an optional fifth "invert" parameter. Setting this parameter to true
+    //will flip all colors on the image, making black white and white black.
+    //Sixth parameter will dither the image.
+    if (!display.drawJpegFromWeb(&display, "https://varipass.org/destination.jpg", 0, 100, false, true)) {
+        //If is something failed (wrong filename or format), write error message on the screen.
+        display.println("Image open error");
+        display.display();
+    }
+    display.display();
+
+    WiFi.mode(WIFI_OFF);
+}
+
+void loop() {
+    //Nothing...
+}