private SKBitmap BuildSquareCollageBitmap(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 = GetNextValidImage(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);
}
/// <summary>
/// Gets the next valid image as a bitmap.
/// </summary>
/// <param name="skiaEncoder">The current skia encoder.</param>
/// <param name="paths">The list of image paths.</param>
/// <param name="currentIndex">The current checked indes.</param>
/// <param name="newIndex">The new index.</param>
/// <returns>A valid bitmap, or null if no bitmap exists after <c>currentIndex</c>.</returns>
public static SKBitmap?GetNextValidImage(SkiaEncoder skiaEncoder, IReadOnlyList <string> paths, int currentIndex, out int newIndex)
{
var imagesTested = new Dictionary <int, int>();
SKBitmap?bitmap = null;
while (imagesTested.Count < paths.Count)
{
if (currentIndex >= paths.Count)
{
currentIndex = 0;
}
bitmap = skiaEncoder.Decode(paths[currentIndex], false, null, out _);
imagesTested[currentIndex] = 0;
currentIndex++;
if (bitmap != null)
{
break;
}
}
newIndex = currentIndex;
return(bitmap);
}
private SKBitmap GetNextValidImage(string[] paths, int currentIndex, out int newIndex)
{
var imagesTested = new Dictionary <int, int>();
SKBitmap bitmap = null;
while (imagesTested.Count < paths.Length)
{
if (currentIndex >= paths.Length)
{
currentIndex = 0;
}
bitmap = SkiaEncoder.Decode(paths[currentIndex], false, _fileSystem, null, out var origin);
imagesTested[currentIndex] = 0;
currentIndex++;
if (bitmap != null)
{
break;
}
}
newIndex = currentIndex;
return(bitmap);
}
private SKBitmap BuildThumbCollageBitmap(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 = GetNextValidImage(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
var paintColor = new SKPaint
{
Color = SKColors.Black.WithAlpha(0x78),
Style = SKPaintStyle.Fill
};
canvas.DrawRect(0, 0, width, height, paintColor);
// draw library name
var textPaint = new SKPaint
{
Color = SKColors.White,
Style = SKPaintStyle.Fill,
TextSize = 112,
TextAlign = SKTextAlign.Center,
Typeface = SKTypeface.FromFamilyName("sans-serif", SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright),
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);
}
private SKBitmap BuildThumbCollageBitmap(string[] paths, int width, int height)
{
var bitmap = new SKBitmap(width, height);
using var canvas = new SKCanvas(bitmap);
canvas.Clear(SKColors.Black);
// number of images used in the thumbnail
var iCount = 3;
// determine sizes for each image that will composited into the final image
var iSlice = Convert.ToInt32(width / iCount);
int iHeight = Convert.ToInt32(height * 1.00);
int imageIndex = 0;
for (int i = 0; i < iCount; i++)
{
using var currentBitmap = GetNextValidImage(paths, imageIndex, out int newIndex);
imageIndex = newIndex;
if (currentBitmap == null)
{
continue;
}
// resize to the same aspect as the original
int iWidth = Math.Abs(iHeight * currentBitmap.Width / currentBitmap.Height);
using var resizedImage = SkiaEncoder.ResizeImage(currentBitmap, new SKImageInfo(iWidth, iHeight, currentBitmap.ColorType, currentBitmap.AlphaType, currentBitmap.ColorSpace));
// crop image
int ix = Math.Abs((iWidth - iSlice) / 2);
using var subset = resizedImage.Subset(SKRectI.Create(ix, 0, iSlice, iHeight));
// draw image onto canvas
canvas.DrawImage(subset ?? resizedImage, iSlice * i, 0);
}
return(bitmap);
}
/// <summary>
/// Initializes a new instance of the <see cref="StripCollageBuilder"/> class.
/// </summary>
/// <param name="skiaEncoder">The encoder to use for building collages.</param>
public StripCollageBuilder(SkiaEncoder skiaEncoder)
{
_skiaEncoder = skiaEncoder;
}
private SKBitmap BuildThumbCollageBitmap(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 = GetNextValidImage(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
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
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>
/// Initializes a new instance of the <see cref="SplashscreenBuilder"/> class.
/// </summary>
/// <param name="skiaEncoder">The SkiaEncoder.</param>
public SplashscreenBuilder(SkiaEncoder skiaEncoder)
{
_skiaEncoder = skiaEncoder;
}
