diff options
Diffstat (limited to 'src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs')
| -rw-r--r-- | src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs | 174 |
1 files changed, 141 insertions, 33 deletions
diff --git a/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs b/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs index 4aff26c16..64c33d5c2 100644 --- a/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs +++ b/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs @@ -1,5 +1,6 @@ using System; using System.Collections.Generic; +using System.Globalization; using System.IO; using System.Text.RegularExpressions; using SkiaSharp; @@ -23,9 +24,6 @@ public partial class StripCollageBuilder _skiaEncoder = skiaEncoder; } - [GeneratedRegex(@"[^\p{IsCJKUnifiedIdeographs}\p{IsCJKUnifiedIdeographsExtensionA}\p{IsKatakana}\p{IsHiragana}\p{IsHangulSyllables}\p{IsHangulJamo}]")] - private static partial Regex NonCjkPatternRegex(); - [GeneratedRegex(@"\p{IsArabic}|\p{IsArmenian}|\p{IsHebrew}|\p{IsSyriac}|\p{IsThaana}")] private static partial Regex IsRtlTextRegex(); @@ -111,43 +109,33 @@ public partial class StripCollageBuilder // 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)); + using var resizedBackdrop = SkiaEncoder.ResizeImage(backdrop, new SKImageInfo(width, backdropHeight, backdrop.ColorType, backdrop.AlphaType, backdrop.ColorSpace)); + using var paint = new SKPaint(); // draw the backdrop - canvas.DrawImage(residedBackdrop, 0, 0); + canvas.DrawImage(resizedBackdrop, 0, 0, SkiaEncoder.DefaultSamplingOptions, paint); // draw shadow rectangle - using var paintColor = new SKPaint - { - Color = SKColors.Black.WithAlpha(0x78), - Style = SKPaintStyle.Fill - }; + using var paintColor = new SKPaint(); + paintColor.Color = SKColors.Black.WithAlpha(0x78); + paintColor.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 filteredName = NonCjkPatternRegex().Replace(libraryName ?? string.Empty, string.Empty); - if (!string.IsNullOrEmpty(filteredName)) - { - typeFace = SKFontManager.Default.MatchCharacter(null, SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright, null, filteredName[0]); - } + var typeFace = SkiaEncoder.DefaultTypeFace; // draw library name - using var textPaint = new SKPaint - { - Color = SKColors.White, - Style = SKPaintStyle.Fill, - TextSize = 112, - TextAlign = SKTextAlign.Center, - Typeface = typeFace, - IsAntialias = true - }; + using var textFont = new SKFont(); + textFont.Size = 112; + textFont.Typeface = typeFace; + using var textPaint = new SKPaint(); + textPaint.Color = SKColors.White; + textPaint.Style = SKPaintStyle.Fill; + textPaint.IsAntialias = true; // scale down text to 90% of the width if text is larger than 95% of the width - var textWidth = textPaint.MeasureText(libraryName); + var textWidth = textFont.MeasureText(libraryName); if (textWidth > width * 0.95) { - textPaint.TextSize = 0.9f * width * textPaint.TextSize / textWidth; + textFont.Size = 0.9f * width * textFont.Size / textWidth; } if (string.IsNullOrWhiteSpace(libraryName)) @@ -155,13 +143,22 @@ public partial class StripCollageBuilder return bitmap; } + var realWidth = DrawText(null, 0, (height / 2f) + (textFont.Metrics.XHeight / 2), libraryName, textPaint, textFont); + if (realWidth > width * 0.95) + { + textFont.Size = 0.9f * width * textFont.Size / realWidth; + realWidth = DrawText(null, 0, (height / 2f) + (textFont.Metrics.XHeight / 2), libraryName, textPaint, textFont); + } + + var padding = (width - realWidth) / 2; + if (IsRtlTextRegex().IsMatch(libraryName)) { - canvas.DrawShapedText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint); + DrawText(canvas, width - padding, (height / 2f) + (textFont.Metrics.XHeight / 2), libraryName, textPaint, textFont, true); } else { - canvas.DrawText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint); + DrawText(canvas, padding, (height / 2f) + (textFont.Metrics.XHeight / 2), libraryName, textPaint, textFont); } return bitmap; @@ -187,17 +184,128 @@ public partial class StripCollageBuilder continue; } - // Scale image. The FromBitmap creates a copy + // Scale image var imageInfo = new SKImageInfo(cellWidth, cellHeight, currentBitmap.ColorType, currentBitmap.AlphaType, currentBitmap.ColorSpace); using var resizeImage = SkiaEncoder.ResizeImage(currentBitmap, imageInfo); + using var paint = new SKPaint(); // draw this image into the strip at the next position var xPos = x * cellWidth; var yPos = y * cellHeight; - canvas.DrawImage(resizeImage, xPos, yPos); + canvas.DrawImage(resizeImage, xPos, yPos, SkiaEncoder.DefaultSamplingOptions, paint); } } return bitmap; } + + /// <summary> + /// Draw shaped text with given SKPaint. + /// </summary> + /// <param name="canvas">If not null, draw text to this canvas, otherwise only measure the text width.</param> + /// <param name="x">x position of the canvas to draw text.</param> + /// <param name="y">y position of the canvas to draw text.</param> + /// <param name="text">The text to draw.</param> + /// <param name="textPaint">The SKPaint to style the text.</param> + /// <param name="textFont">The SKFont to style the text.</param> + /// <param name="alignment">The alignment of the text. Default aligns to left.</param> + /// <returns>The width of the text.</returns> + private static float MeasureAndDrawText(SKCanvas? canvas, float x, float y, string text, SKPaint textPaint, SKFont textFont, SKTextAlign alignment = SKTextAlign.Left) + { + var width = textFont.MeasureText(text); + canvas?.DrawShapedText(text, x, y, alignment, textFont, textPaint); + return width; + } + + /// <summary> + /// Draw shaped text with given SKPaint, search defined type faces to render as many texts as possible. + /// </summary> + /// <param name="canvas">If not null, draw text to this canvas, otherwise only measure the text width.</param> + /// <param name="x">x position of the canvas to draw text.</param> + /// <param name="y">y position of the canvas to draw text.</param> + /// <param name="text">The text to draw.</param> + /// <param name="textPaint">The SKPaint to style the text.</param> + /// <param name="textFont">The SKFont to style the text.</param> + /// <param name="isRtl">If true, render from right to left.</param> + /// <returns>The width of the text.</returns> + private static float DrawText(SKCanvas? canvas, float x, float y, string text, SKPaint textPaint, SKFont textFont, bool isRtl = false) + { + float width = 0; + var alignment = isRtl ? SKTextAlign.Right : SKTextAlign.Left; + + if (textFont.ContainsGlyphs(text)) + { + // Current font can render all characters in text + return MeasureAndDrawText(canvas, x, y, text, textPaint, textFont, alignment); + } + + // Iterate over all text elements using TextElementEnumerator + // We cannot use foreach here because a human-readable character (grapheme cluster) can be multiple code points + // We cannot render character by character because glyphs do not always have same width + // And the result will look very unnatural due to the width difference and missing natural spacing + var start = 0; + var enumerator = StringInfo.GetTextElementEnumerator(text); + while (enumerator.MoveNext()) + { + bool notAtEnd; + var textElement = enumerator.GetTextElement(); + if (textFont.ContainsGlyphs(textElement)) + { + continue; + } + + // If we get here, we have a text element which cannot be rendered with current font + // Draw previous characters which can be rendered with current font + if (start != enumerator.ElementIndex) + { + var regularText = text.Substring(start, enumerator.ElementIndex - start); + width += MeasureAndDrawText(canvas, MoveX(x, width), y, regularText, textPaint, textFont, alignment); + start = enumerator.ElementIndex; + } + + // Search for next point where current font can render the character there + while ((notAtEnd = enumerator.MoveNext()) && !textFont.ContainsGlyphs(enumerator.GetTextElement())) + { + // Do nothing, just move enumerator to the point where current font can render the character + } + + // Now we have a substring that should pick another font + // The enumerator may or may not be already at the end of the string + var subtext = notAtEnd + ? text.Substring(start, enumerator.ElementIndex - start) + : text[start..]; + + var fallback = SkiaEncoder.GetFontForCharacter(textElement); + + if (fallback is not null) + { + using var fallbackTextFont = new SKFont(); + fallbackTextFont.Size = textFont.Size; + fallbackTextFont.Typeface = fallback; + using var fallbackTextPaint = new SKPaint(); + fallbackTextPaint.Color = textPaint.Color; + fallbackTextPaint.Style = textPaint.Style; + fallbackTextPaint.IsAntialias = textPaint.IsAntialias; + + // Do the search recursively to select all possible fonts + width += DrawText(canvas, MoveX(x, width), y, subtext, fallbackTextPaint, fallbackTextFont, isRtl); + } + else + { + // Used up all fonts and no fonts can be found, just use current font + width += MeasureAndDrawText(canvas, MoveX(x, width), y, text[start..], textPaint, textFont, alignment); + } + + start = notAtEnd ? enumerator.ElementIndex : text.Length; + } + + // Render the remaining text that current fonts can render + if (start < text.Length) + { + width += MeasureAndDrawText(canvas, MoveX(x, width), y, text[start..], textPaint, textFont, alignment); + } + + return width; + float MoveX(float currentX, float dWidth) => isRtl ? currentX - dWidth : currentX + dWidth; + } } |