public byte[] DisplayBuffer; // A working pixel buffer for your code
public ILI9341Display(string defaultText, int ulValue, int dcpin, int resetpin)
{
LCD_VERTICAL_MAX = VERTICAL_MAX_DEFAULT; // Y
LCD_HORIZONTAL_MAX = HORIZONTAL_MAX_DEFAULT; // X
//InitSPI(SpiDevice SPI, int SPIpin, int speed, SpiMode mode, string SPI_CONTROLLER_NAME)
DCPin = ILI9341.InitGPIO(dcpin, GpioPinDriveMode.Output, GpioPinValue.High);
ResetPin = ILI9341.InitGPIO(resetpin, GpioPinDriveMode.Output, GpioPinValue.High);
cursorX = 0;
cursorY = 0;
DisplayBuffer = new byte[LCD_VERTICAL_MAX * LCD_HORIZONTAL_MAX * 2]; // A working pixel buffer for your code, RGB565
currentImage = "";
}
public static async Task LoadBitmap(ILI9488Display display, string name)
{
try
{
StorageFile srcfile = await StorageFile.GetFileFromApplicationUriAsync(new Uri(name));
using (IRandomAccessStream fileStream = await srcfile.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(fileStream);
BitmapTransform transform = new BitmapTransform()
{
ScaledWidth = Convert.ToUInt32(display.LCD_HORIZONTAL_MAX),
ScaledHeight = Convert.ToUInt32(display.LCD_VERTICAL_MAX)
};
PixelDataProvider pixelData = await decoder.GetPixelDataAsync(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Straight,
transform,
ExifOrientationMode.RespectExifOrientation,
ColorManagementMode.DoNotColorManage
);
byte[] sourcePixels = pixelData.DetachPixelData();
if (sourcePixels.Length != display.LCD_HORIZONTAL_MAX * display.LCD_VERTICAL_MAX * 4)
{
return;
}
int pi = 0;
for (UInt32 x = 0; x < sourcePixels.Length - 1; x += 4)
{
// we ignore the alpha value [3]
ushort temp = ILI9341.RGB24ToRGB565(sourcePixels[x + 2], sourcePixels[x + 1], sourcePixels[x]);
display.DisplayBuffer[pi * 2] = (byte)((temp >> 8) & 0xFF);
display.DisplayBuffer[pi * 2 + 1] = (byte)(temp & 0xFF);
pi++;
}
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
display.currentImage = name;
}
