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55 changes: 27 additions & 28 deletions src/OpenStreetMap-esp32.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -392,46 +392,45 @@ bool OpenStreetMap::saveMap(const char *filename, LGFX_Sprite &sprite, String &r
uint32_t biClrImportant = 0;

// Write BMP header
file.write((uint8_t *)&bfType, 2);
file.write((uint8_t *)&bfSize, 4);
file.write((uint8_t *)&bfReserved, 2);
file.write((uint8_t *)&bfReserved, 2);
file.write((uint8_t *)&bfOffBits, 4);

file.write((uint8_t *)&biSize, 4);
file.write((uint8_t *)&biWidth, 4);
file.write((uint8_t *)&biHeight, 4);
file.write((uint8_t *)&biPlanes, 2);
file.write((uint8_t *)&biBitCount, 2);
file.write((uint8_t *)&biCompression, 4);
file.write((uint8_t *)&biSizeImage, 4);
file.write((uint8_t *)&biXPelsPerMeter, 4);
file.write((uint8_t *)&biYPelsPerMeter, 4);
file.write((uint8_t *)&biClrUsed, 4);
file.write((uint8_t *)&biClrImportant, 4);
file.write(reinterpret_cast<const uint8_t*>(&bfType), sizeof(bfType));
file.write(reinterpret_cast<const uint8_t*>(&bfSize), sizeof(bfSize));
file.write(reinterpret_cast<const uint8_t*>(&bfReserved), sizeof(bfReserved));
file.write(reinterpret_cast<const uint8_t*>(&bfOffBits), sizeof(bfOffBits));

file.write(reinterpret_cast<const uint8_t*>(&biSize), sizeof(biSize));
file.write(reinterpret_cast<const uint8_t*>(&biWidth), sizeof(biWidth));
file.write(reinterpret_cast<const uint8_t*>(&biHeight), sizeof(biHeight));
file.write(reinterpret_cast<const uint8_t*>(&biPlanes), sizeof(biPlanes));
file.write(reinterpret_cast<const uint8_t*>(&biBitCount), sizeof(biBitCount));
file.write(reinterpret_cast<const uint8_t*>(&biCompression), sizeof(biCompression));
file.write(reinterpret_cast<const uint8_t*>(&biSizeImage), sizeof(biSizeImage));
file.write(reinterpret_cast<const uint8_t*>(&biXPelsPerMeter), sizeof(biXPelsPerMeter));
file.write(reinterpret_cast<const uint8_t*>(&biYPelsPerMeter), sizeof(biYPelsPerMeter));
file.write(reinterpret_cast<const uint8_t*>(&biClrUsed), sizeof(biClrUsed));
file.write(reinterpret_cast<const uint8_t*>(&biClrImportant), sizeof(biClrImportant));

for (int y = 0; y < sprite.height(); y++)
{
for (int x = 0; x < sprite.width(); x++)
{
uint16_t color = sprite.readPixel(x, y); // Read pixel color (RGB565 format)
uint8_t r = (color >> 11) & 0x1F;
uint8_t g = (color >> 5) & 0x3F;
uint8_t b = color & 0x1F;
uint16_t rgb565Color = sprite.readPixel(x, y); // Read pixel color (RGB565 format)
uint8_t red5 = (rgb565Color >> 11) & 0x1F;
uint8_t green6 = (rgb565Color >> 5) & 0x3F;
uint8_t blue5 = rgb565Color & 0x1F;

// Convert RGB565 to RGB888
r = (r * 255) / 31;
g = (g * 255) / 63;
b = (b * 255) / 31;
uint8_t red8 = (red5 * 255) / 31;
uint8_t green8 = (green6 * 255) / 63;
uint8_t blue8 = (blue5 * 255) / 31;

file.write(b);
file.write(g);
file.write(r);
file.write(blue8);
file.write(green8);
file.write(red8);
}
}

file.close();
SD.end();
result = "Screenshot saved";
return true;
}
}