first commit

libraries/LovyanGFX/examples/Standard/SaveBMP/SaveBMP.ino

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+#if defined (ARDUINO_WIO_TERMINAL)
+  #include <Seeed_FS.h>
+  #include <SD/Seeed_SD.h>
+#else
+  #include <SD.h>
+  #include <SPIFFS.h>
+#endif
+
+#include <LovyanGFX.hpp>
+
+static LGFX lcd;
+
+static constexpr char filename[] = "/lovyangfx_test.bmp";
+
+#ifndef SDCARD_SS_PIN
+#define SDCARD_SS_PIN 4
+#endif
+
+#ifndef SDCARD_SPI
+#define SDCARD_SPI SPI
+#endif
+
+
+bool saveToSD_16bit(void)
+{
+  bool result = false;
+  File file = SD.open(filename, "w");
+  if (file)
+  {
+    int width  = lcd.width();
+    int height = lcd.height();
+
+    int rowSize = (2 * width + 3) & ~ 3;
+
+    lgfx::bitmap_header_t bmpheader;
+    bmpheader.bfType = 0x4D42;
+    bmpheader.bfSize = rowSize * height + sizeof(bmpheader);
+    bmpheader.bfOffBits = sizeof(bmpheader);
+
+    bmpheader.biSize = 40;
+    bmpheader.biWidth = width;
+    bmpheader.biHeight = height;
+    bmpheader.biPlanes = 1;
+    bmpheader.biBitCount = 16;
+    bmpheader.biCompression = 3;
+
+    file.write((std::uint8_t*)&bmpheader, sizeof(bmpheader));
+    std::uint8_t buffer[rowSize];
+    memset(&buffer[rowSize - 4], 0, 4);
+    for (int y = lcd.height() - 1; y >= 0; y--)
+    {
+      lcd.readRect(0, y, lcd.width(), 1, (lgfx::rgb565_t*)buffer);
+      file.write(buffer, rowSize);
+    }
+    file.close();
+    result = true;
+  }
+  else
+  {
+    Serial.print("error:file open failure\n");
+  }
+
+  return result;
+}
+
+bool saveToSD_24bit(void)
+{
+  bool result = false;
+  File file = SD.open(filename, "w");
+  if (file)
+  {
+    int width  = lcd.width();
+    int height = lcd.height();
+
+    int rowSize = (3 * width + 3) & ~ 3;
+
+    lgfx::bitmap_header_t bmpheader;
+    bmpheader.bfType = 0x4D42;
+    bmpheader.bfSize = rowSize * height + sizeof(bmpheader);
+    bmpheader.bfOffBits = sizeof(bmpheader);
+
+    bmpheader.biSize = 40;
+    bmpheader.biWidth = width;
+    bmpheader.biHeight = height;
+    bmpheader.biPlanes = 1;
+    bmpheader.biBitCount = 24;
+    bmpheader.biCompression = 0;
+
+    file.write((std::uint8_t*)&bmpheader, sizeof(bmpheader));
+    std::uint8_t buffer[rowSize];
+    memset(&buffer[rowSize - 4], 0, 4);
+    for (int y = lcd.height() - 1; y >= 0; y--)
+    {
+      lcd.readRect(0, y, lcd.width(), 1, (lgfx::rgb888_t*)buffer);
+      file.write(buffer, rowSize);
+    }
+    file.close();
+    result = true;
+  }
+  else
+  {
+    Serial.print("error:file open failure\n");
+  }
+
+  return result;
+}
+
+void setup(void)
+{
+  lcd.init();
+
+  Serial.begin(115200);
+
+  lcd.setColorDepth(16);
+
+  lcd.setColor(TFT_WHITE);
+  lcd.startWrite();
+  lcd.setAddrWindow(0, 0, lcd.width(), lcd.height());
+  for (int y = 0; y < lcd.height(); ++y)
+  {
+    for (int x = 0; x < lcd.width(); ++x)
+    {
+      lcd.writeColor( lcd.color888(x << 1, x + y, y << 1), 1);
+    }
+  }
+  lcd.print("BMP save test\n");
+  lcd.endWrite();
+
+  do {
+    SD.end();
+    delay(1000);
+
+    SD.begin(SDCARD_SS_PIN, SDCARD_SPI, 25000000);
+
+  } while (!saveToSD_16bit());
+
+
+  lcd.print("BMP save success.");
+}
+
+void loop(void)
+{
+  lcd.drawBmpFile(SD, filename, random(-20,20), random(-20, 20));
+}