private SKBitmap BuildSquareCollageBitmap(IReadOnlyList <string> paths, int width, int height)
{
var bitmap = new SKBitmap(width, height);
var imageIndex = 0;
var cellWidth = width / 2;
var cellHeight = height / 2;
using var canvas = new SKCanvas(bitmap);
for (var x = 0; x < 2; x++)
{
for (var y = 0; y < 2; y++)
{
using var currentBitmap = SkiaHelper.GetNextValidImage(_skiaEncoder, paths, imageIndex, out int newIndex);
imageIndex = newIndex;
if (currentBitmap == null)
{
continue;
}
// Scale image. The FromBitmap creates a copy
var imageInfo = new SKImageInfo(cellWidth, cellHeight, currentBitmap.ColorType, currentBitmap.AlphaType, currentBitmap.ColorSpace);
using var resizedBitmap = SKBitmap.FromImage(SkiaEncoder.ResizeImage(currentBitmap, imageInfo));
// draw this image into the strip at the next position
var xPos = x * cellWidth;
var yPos = y * cellHeight;
canvas.DrawBitmap(resizedBitmap, xPos, yPos);
}
}
return(bitmap);
}
private SKBitmap BuildThumbCollageBitmap(IReadOnlyList <string> paths, int width, int height, string?libraryName)
{
var bitmap = new SKBitmap(width, height);
using var canvas = new SKCanvas(bitmap);
canvas.Clear(SKColors.Black);
using var backdrop = SkiaHelper.GetNextValidImage(_skiaEncoder, paths, 0, out _);
if (backdrop == null)
{
return(bitmap);
}
// resize to the same aspect as the original
var backdropHeight = Math.Abs(width * backdrop.Height / backdrop.Width);
using var residedBackdrop = SkiaEncoder.ResizeImage(backdrop, new SKImageInfo(width, backdropHeight, backdrop.ColorType, backdrop.AlphaType, backdrop.ColorSpace));
// draw the backdrop
canvas.DrawImage(residedBackdrop, 0, 0);
// draw shadow rectangle
using var paintColor = new SKPaint
{
Color = SKColors.Black.WithAlpha(0x78),
Style = SKPaintStyle.Fill
};
canvas.DrawRect(0, 0, width, height, paintColor);
var typeFace = SKTypeface.FromFamilyName("sans-serif", SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright);
// use the system fallback to find a typeface for the given CJK character
var nonCjkPattern = @"[^\p{IsCJKUnifiedIdeographs}\p{IsCJKUnifiedIdeographsExtensionA}\p{IsKatakana}\p{IsHiragana}\p{IsHangulSyllables}\p{IsHangulJamo}]";
var filteredName = Regex.Replace(libraryName ?? string.Empty, nonCjkPattern, string.Empty);
if (!string.IsNullOrEmpty(filteredName))
{
typeFace = SKFontManager.Default.MatchCharacter(null, SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright, null, filteredName[0]);
}
// draw library name
using var textPaint = new SKPaint
{
Color = SKColors.White,
Style = SKPaintStyle.Fill,
TextSize = 112,
TextAlign = SKTextAlign.Center,
Typeface = typeFace,
IsAntialias = true
};
// scale down text to 90% of the width if text is larger than 95% of the width
var textWidth = textPaint.MeasureText(libraryName);
if (textWidth > width * 0.95)
{
textPaint.TextSize = 0.9f * width * textPaint.TextSize / textWidth;
}
canvas.DrawText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
return(bitmap);
}
/// <summary>
/// Generates a collage of posters and landscape pictures.
/// </summary>
/// <param name="posters">The poster paths.</param>
/// <param name="backdrops">The landscape paths.</param>
/// <returns>The created collage as a bitmap.</returns>
private SKBitmap GenerateCollage(IReadOnlyList <string> posters, IReadOnlyList <string> backdrops)
{
var posterIndex = 0;
var backdropIndex = 0;
var bitmap = new SKBitmap(WallWidth, WallHeight);
using var canvas = new SKCanvas(bitmap);
canvas.Clear(SKColors.Black);
int posterHeight = WallHeight / 6;
for (int i = 0; i < Rows; i++)
{
int imageCounter = Random.Shared.Next(0, 5);
int currentWidthPos = i * 75;
int currentHeight = i * (posterHeight + Spacing);
while (currentWidthPos < WallWidth)
{
SKBitmap?currentImage;
switch (imageCounter)
{
case 0:
case 2:
case 3:
currentImage = SkiaHelper.GetNextValidImage(_skiaEncoder, posters, posterIndex, out int newPosterIndex);
posterIndex = newPosterIndex;
break;
default:
currentImage = SkiaHelper.GetNextValidImage(_skiaEncoder, backdrops, backdropIndex, out int newBackdropIndex);
backdropIndex = newBackdropIndex;
break;
}
if (currentImage == null)
{
throw new ArgumentException("Not enough valid pictures provided to create a splashscreen!");
}
// resize to the same aspect as the original
var imageWidth = Math.Abs(posterHeight * currentImage.Width / currentImage.Height);
using var resizedBitmap = new SKBitmap(imageWidth, posterHeight);
currentImage.ScalePixels(resizedBitmap, SKFilterQuality.High);
// draw on canvas
canvas.DrawBitmap(resizedBitmap, currentWidthPos, currentHeight);
currentWidthPos += imageWidth + Spacing;
currentImage.Dispose();
if (imageCounter >= 4)
{
imageCounter = 0;
}
else
{
imageCounter++;
}
}
}
return(bitmap);
}