zGxEPD2/examples/GxEPD2_WiFi_Example/GxEPD2_WiFi_Buffered.h

void drawBitmapFrom_HTTP_ToBuffer(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color)
{
  WiFiClient client;
  bool connection_ok = false;
  bool valid = false; // valid format to be handled
  bool flip = true; // bitmap is stored bottom-to-top
  bool has_multicolors = (display.epd2.panel == GxEPD2::ACeP565) || (display.epd2.panel == GxEPD2::GDEY073D46)|| (display.epd2.panel == GxEPD2::GDEP073E01);
  uint32_t startTime = millis();
  if ((x >= display.width()) || (y >= display.height())) return;
  display.fillScreen(GxEPD_WHITE);
  Serial.print("connecting to "); Serial.println(host);
  if (!client.connect(host, httpPort))
  {
    Serial.println("connection failed");
    return;
  }
  Serial.print("requesting URL: ");
  Serial.println(String("http://") + host + path + filename);
  client.print(String("GET ") + path + filename + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: GxEPD2_WiFi_Example\r\n" +
               "Connection: close\r\n\r\n");
  Serial.println("request sent");
  while (client.connected())
  {
    String line = client.readStringUntil('\n');
    if (!connection_ok)
    {
      connection_ok = line.startsWith("HTTP/1.1 200 OK");
      if (connection_ok) Serial.println(line);
    }
    if (!connection_ok) Serial.println(line);
    if (line == "\r")
    {
      Serial.println("headers received");
      break;
    }
  }
  if (!connection_ok) return;
  // Parse BMP header
  if (read16(client) == 0x4D42) // BMP signature
  {
    uint32_t fileSize = read32(client);
    uint32_t creatorBytes = read32(client); (void)creatorBytes; //unused
    uint32_t imageOffset = read32(client); // Start of image data
    uint32_t headerSize = read32(client);
    uint32_t width  = read32(client);
    int32_t height = (int32_t) read32(client);
    uint16_t planes = read16(client);
    uint16_t depth = read16(client); // bits per pixel
    uint32_t format = read32(client);
    uint32_t bytes_read = 7 * 4 + 3 * 2; // read so far
    if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
    {
      Serial.print("File size: "); Serial.println(fileSize);
      Serial.print("Image Offset: "); Serial.println(imageOffset);
      Serial.print("Header size: "); Serial.println(headerSize);
      Serial.print("Bit Depth: "); Serial.println(depth);
      Serial.print("Image size: ");
      Serial.print(width);
      Serial.print('x');
      Serial.println(abs(height));
      // BMP rows are padded (if needed) to 4-byte boundary
      uint32_t rowSize = (width * depth / 8 + 3) & ~3;
      if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
      if (height < 0)
      {
        height = -height;
        flip = false;
      }
      uint16_t w = width;
      uint16_t h = height;
      if ((x + w - 1) >= display.width())  w = display.width()  - x;
      if ((y + h - 1) >= display.height()) h = display.height() - y;
      //if (w <= max_row_width) // handle with direct drawing
      {
        valid = true;
        uint8_t bitmask = 0xFF;
        uint8_t bitshift = 8 - depth;
        uint16_t red, green, blue;
        bool whitish = false;
        bool colored = false;
        if (depth == 1) with_color = false;
        if (depth <= 8)
        {
          if (depth < 8) bitmask >>= depth;
          bytes_read += skip(client, imageOffset - (4 << depth) - bytes_read); // 54 for regular, diff for colorsimportant
          for (uint16_t pn = 0; pn < (1 << depth); pn++)
          {
            blue  = client.read();
            green = client.read();
            red   = client.read();
            client.read();
            bytes_read += 4;
            whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
            colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
            if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
            mono_palette_buffer[pn / 8] |= whitish << pn % 8;
            if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
            color_palette_buffer[pn / 8] |= colored << pn % 8;
            //Serial.print("0x00"); Serial.print(red, HEX); Serial.print(green, HEX); Serial.print(blue, HEX);
            //Serial.print(" : "); Serial.print(whitish); Serial.print(", "); Serial.println(colored);
            rgb_palette_buffer[pn] = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
          }
        }
        uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
        bytes_read += skip(client, rowPosition - bytes_read);
        for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
        {
          if (!connection_ok || !(client.connected() || client.available())) break;
          delay(1); // yield() to avoid WDT
          uint32_t in_remain = rowSize;
          uint32_t in_idx = 0;
          uint32_t in_bytes = 0;
          uint8_t in_byte = 0; // for depth <= 8
          uint8_t in_bits = 0; // for depth <= 8
          uint16_t color = GxEPD_WHITE;
          for (uint16_t col = 0; col < w; col++) // for each pixel
          {
            yield();
            if (!connection_ok || !(client.connected() || client.available())) break;
            // Time to read more pixel data?
            if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
            {
              uint32_t get = in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain;
              uint32_t got = read8n(client, input_buffer, get);
              while ((got < get) && connection_ok)
              {
                //Serial.print("got "); Serial.print(got); Serial.print(" < "); Serial.print(get); Serial.print(" @ "); Serial.println(bytes_read);
                uint32_t gotmore = read8n(client, input_buffer + got, get - got);
                got += gotmore;
                connection_ok = gotmore > 0;
              }
              in_bytes = got;
              in_remain -= got;
              bytes_read += got;
              in_idx = 0;
            }
            if (!connection_ok)
            {
              Serial.print("Error: got no more after "); Serial.print(bytes_read); Serial.println(" bytes read!");
              break;
            }
            switch (depth)
            {
              case 32:
                blue = input_buffer[in_idx++];
                green = input_buffer[in_idx++];
                red = input_buffer[in_idx++];
                in_idx++; // skip alpha
                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
                color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
                break;
              case 24:
                blue = input_buffer[in_idx++];
                green = input_buffer[in_idx++];
                red = input_buffer[in_idx++];
                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
                color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
                break;
              case 16:
                {
                  uint8_t lsb = input_buffer[in_idx++];
                  uint8_t msb = input_buffer[in_idx++];
                  if (format == 0) // 555
                  {
                    blue  = (lsb & 0x1F) << 3;
                    green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
                    red   = (msb & 0x7C) << 1;
                    color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
                  }
                  else // 565
                  {
                    blue  = (lsb & 0x1F) << 3;
                    green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
                    red   = (msb & 0xF8);
                    color = (msb << 8) | lsb;
                  }
                  whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
                  colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
                }
                break;
              case 1:
              case 2:
              case 4:
              case 8:
                {
                  if (0 == in_bits)
                  {
                    in_byte = input_buffer[in_idx++];
                    in_bits = 8;
                  }
                  uint16_t pn = (in_byte >> bitshift) & bitmask;
                  whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
                  colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
                  in_byte <<= depth;
                  in_bits -= depth;
                  color = rgb_palette_buffer[pn];
                }
                break;
            }
            if (with_color && has_multicolors)
            {
              // keep color
            }
            else if (whitish)
            {
              color = GxEPD_WHITE;
            }
            else if (colored && with_color)
            {
              color = GxEPD_COLORED;
            }
            else
            {
              color = GxEPD_BLACK;
            }
            uint16_t yrow = y + (flip ? h - row - 1 : row);
            display.drawPixel(x + col, yrow, color);
          } // end pixel
        } // end line
      }
      Serial.print("bytes read "); Serial.println(bytes_read);
    }
  }
  Serial.print("loaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
  client.stop();
  if (!valid)
  {
    Serial.println("bitmap format not handled.");
  }
}

void showBitmapFrom_HTTP_Buffered(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color)
{
  Serial.println(); Serial.print("downloading file \""); Serial.print(filename);  Serial.println("\"");
  display.setFullWindow();
  display.firstPage();
  do
  {
    drawBitmapFrom_HTTP_ToBuffer(host, path, filename, x, y, with_color);
  }
  while (display.nextPage());
}

void drawBitmapFrom_HTTPS_ToBuffer(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color, const char* certificate)
{
  // Use WiFiClientSecure class to create TLS connection
#if defined (ESP8266)
  BearSSL::WiFiClientSecure client;
  BearSSL::X509List cert(certificate ? certificate : certificate_rawcontent);
#else
  WiFiClientSecure client;
#endif
  bool connection_ok = false;
  bool valid = false; // valid format to be handled
  bool flip = true; // bitmap is stored bottom-to-top
  bool has_multicolors = (display.epd2.panel == GxEPD2::ACeP565) || (display.epd2.panel == GxEPD2::GDEY073D46)|| (display.epd2.panel == GxEPD2::GDEP073E01);
  uint32_t startTime = millis();
  if ((x >= display.width()) || (y >= display.height())) return;
  display.fillScreen(GxEPD_WHITE);
  Serial.print("connecting to "); Serial.println(host);
#if defined (ESP8266)
  if (certificate) client.setTrustAnchors(&cert);
  else if (fingerprint) client.setFingerprint(fingerprint);
  else client.setInsecure();
#elif defined (ESP32)
  if (certificate) client.setCACert(certificate);
#endif
  if (!client.connect(host, httpsPort))
  {
    Serial.println("connection failed");
    return;
  }
  Serial.print("requesting URL: ");
  Serial.println(String("https://") + host + path + filename);
  client.print(String("GET ") + path + filename + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: GxEPD2_WiFi_Example\r\n" +
               "Connection: close\r\n\r\n");
  Serial.println("request sent");
  while (client.connected())
  {
    String line = client.readStringUntil('\n');
    if (!connection_ok)
    {
      connection_ok = line.startsWith("HTTP/1.1 200 OK");
      if (connection_ok) Serial.println(line);
    }
    if (!connection_ok) Serial.println(line);
    if (line == "\r")
    {
      Serial.println("headers received");
      break;
    }
  }
  if (!connection_ok) return;
  // Parse BMP header
  uint16_t signature = 0;
  for (int16_t i = 0; i < 50; i++)
  {
    if (!client.available()) delay(100);
    else signature = read16(client);
    if (signature == 0x4D42) break;
  }
  if (signature == 0x4D42) // BMP signature
  {
    uint32_t fileSize = read32(client);
    uint32_t creatorBytes = read32(client); (void)creatorBytes; //unused
    uint32_t imageOffset = read32(client); // Start of image data
    uint32_t headerSize = read32(client);
    uint32_t width  = read32(client);
    int32_t height = (int32_t) read32(client);
    uint16_t planes = read16(client);
    uint16_t depth = read16(client); // bits per pixel
    uint32_t format = read32(client);
    uint32_t bytes_read = 7 * 4 + 3 * 2; // read so far
    if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
    {
      Serial.print("File size: "); Serial.println(fileSize);
      Serial.print("Image Offset: "); Serial.println(imageOffset);
      Serial.print("Header size: "); Serial.println(headerSize);
      Serial.print("Bit Depth: "); Serial.println(depth);
      Serial.print("Image size: ");
      Serial.print(width);
      Serial.print('x');
      Serial.println(abs(height));
      // BMP rows are padded (if needed) to 4-byte boundary
      uint32_t rowSize = (width * depth / 8 + 3) & ~3;
      if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
      if (height < 0)
      {
        height = -height;
        flip = false;
      }
      uint16_t w = width;
      uint16_t h = height;
      if ((x + w - 1) >= display.width())  w = display.width()  - x;
      if ((y + h - 1) >= display.height()) h = display.height() - y;
      //if (w <= max_row_width) // handle with direct drawing
      {
        valid = true;
        uint8_t bitmask = 0xFF;
        uint8_t bitshift = 8 - depth;
        uint16_t red, green, blue;
        bool whitish = false;
        bool colored = false;
        if (depth == 1) with_color = false;
        if (depth <= 8)
        {
          if (depth < 8) bitmask >>= depth;
          //bytes_read += skip(client, 54 - bytes_read); //palette is always @ 54
          bytes_read += skip(client, imageOffset - (4 << depth) - bytes_read); // 54 for regular, diff for colorsimportant
          for (uint16_t pn = 0; pn < (1 << depth); pn++)
          {
            blue  = client.read();
            green = client.read();
            red   = client.read();
            client.read();
            bytes_read += 4;
            whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
            colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
            if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
            mono_palette_buffer[pn / 8] |= whitish << pn % 8;
            if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
            color_palette_buffer[pn / 8] |= colored << pn % 8;
            //Serial.print("0x00"); Serial.print(red, HEX); Serial.print(green, HEX); Serial.print(blue, HEX);
            //Serial.print(" : "); Serial.print(whitish); Serial.print(", "); Serial.println(colored);
            rgb_palette_buffer[pn] = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
          }
        }
        uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
        //Serial.print("skip "); Serial.println(rowPosition - bytes_read);
        bytes_read += skip(client, rowPosition - bytes_read);
        for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
        {
          if (!connection_ok || !(client.connected() || client.available())) break;
          delay(1); // yield() to avoid WDT
          uint32_t in_remain = rowSize;
          uint32_t in_idx = 0;
          uint32_t in_bytes = 0;
          uint8_t in_byte = 0; // for depth <= 8
          uint8_t in_bits = 0; // for depth <= 8
          uint16_t color = GxEPD_WHITE;
          for (uint16_t col = 0; col < w; col++) // for each pixel
          {
            yield();
            if (!connection_ok || !(client.connected() || client.available())) break;
            // Time to read more pixel data?
            if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
            {
              uint32_t get = in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain;
              uint32_t got = read8n(client, input_buffer, get);
              while ((got < get) && connection_ok)
              {
                //Serial.print("got "); Serial.print(got); Serial.print(" < "); Serial.print(get); Serial.print(" @ "); Serial.println(bytes_read);
                uint32_t gotmore = read8n(client, input_buffer + got, get - got);
                got += gotmore;
                connection_ok = gotmore > 0;
              }
              in_bytes = got;
              in_remain -= got;
              bytes_read += got;
              in_idx = 0;
            }
            if (!connection_ok)
            {
              Serial.print("Error: got no more after "); Serial.print(bytes_read); Serial.println(" bytes read!");
              break;
            }
            switch (depth)
            {
              case 32:
                blue = input_buffer[in_idx++];
                green = input_buffer[in_idx++];
                red = input_buffer[in_idx++];
                in_idx++; // skip alpha
                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
                color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
                break;
              case 24:
                blue = input_buffer[in_idx++];
                green = input_buffer[in_idx++];
                red = input_buffer[in_idx++];
                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
                color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
                break;
              case 16:
                {
                  uint8_t lsb = input_buffer[in_idx++];
                  uint8_t msb = input_buffer[in_idx++];
                  if (format == 0) // 555
                  {
                    blue  = (lsb & 0x1F) << 3;
                    green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
                    red   = (msb & 0x7C) << 1;
                    color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
                  }
                  else // 565
                  {
                    blue  = (lsb & 0x1F) << 3;
                    green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
                    red   = (msb & 0xF8);
                    color = (msb << 8) | lsb;
                  }
                  whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
                  colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
                }
                break;
              case 1:
              case 2:
              case 4:
              case 8:
                {
                  if (0 == in_bits)
                  {
                    in_byte = input_buffer[in_idx++];
                    in_bits = 8;
                  }
                  uint16_t pn = (in_byte >> bitshift) & bitmask;
                  whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
                  colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
                  in_byte <<= depth;
                  in_bits -= depth;
                  color = rgb_palette_buffer[pn];
                }
                break;
            }
            if (with_color && has_multicolors)
            {
              // keep color
            }
            else if (whitish)
            {
              color = GxEPD_WHITE;
            }
            else if (colored && with_color)
            {
              color = GxEPD_COLORED;
            }
            else
            {
              color = GxEPD_BLACK;
            }
            uint16_t yrow = y + (flip ? h - row - 1 : row);
            display.drawPixel(x + col, yrow, color);
          } // end pixel
        } // end line
      }
      Serial.print("bytes read "); Serial.println(bytes_read);
    }
  }
  Serial.print("loaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
  client.stop();
  if (!valid)
  {
    Serial.println("bitmap format not handled.");
  }
}

void showBitmapFrom_HTTPS_Buffered(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color, const char* certificate)
{
  Serial.println(); Serial.print("downloading file \""); Serial.print(filename);  Serial.println("\"");
  display.setFullWindow();
  display.firstPage();
  do
  {
    drawBitmapFrom_HTTPS_ToBuffer(host, path, filename, fingerprint, x, y, with_color, certificate);
  }
  while (display.nextPage());
}