92 lines
3.4 KiB
C#
92 lines
3.4 KiB
C#
using Age.Engine.Model;
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using Age.Engine.Sys4;
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namespace Age.Engine.Text;
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public readonly record struct GlyphTextLayoutOptions(
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int CursorX,
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int CursorY,
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int LineOriginX,
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int RightBound,
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int BottomBound,
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bool WrapHorizontally,
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AdvTextStyle Style);
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public sealed record GlyphTextLayoutResult(
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IReadOnlyList<AdvRetainedGlyphRecord> Records,
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int CursorX,
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int CursorY,
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int ConsumedGlyphs,
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int WrappedLines,
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AdvTextOverflowFlags ObservedOverflow,
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bool StoppedOnVerticalOverflow);
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/// <summary>
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/// Builds native-edge retained records while rasterizing masks into the layout's RGBA surface.
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/// This is deliberately presentation-neutral: binding records to GfxState belongs to a later slice.
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/// </summary>
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public sealed class RetainedGlyphLayoutEngine
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{
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private readonly IGlyphMaskRasterizer _rasterizer;
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public RetainedGlyphLayoutEngine(IGlyphMaskRasterizer rasterizer)
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=> _rasterizer = rasterizer ?? throw new ArgumentNullException(nameof(rasterizer));
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public GlyphTextLayoutResult Render(
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RgbaImage destination,
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GlyphTextLayoutOptions options,
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IReadOnlyList<GlyphRasterRequest> glyphs)
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{
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ArgumentNullException.ThrowIfNull(destination);
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ArgumentNullException.ThrowIfNull(glyphs);
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var records = new List<AdvRetainedGlyphRecord>(glyphs.Count);
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int cursorX = options.CursorX;
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int cursorY = options.CursorY;
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int wrappedLines = 0;
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var observed = AdvTextOverflowFlags.None;
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bool stopped = false;
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foreach (GlyphRasterRequest request in glyphs)
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{
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ArgumentNullException.ThrowIfNull(request);
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GlyphMask mask = _rasterizer.Rasterize(request);
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int right = checked(cursorX + mask.CellWidth);
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int bottom = checked(cursorY + mask.CellHeight);
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AdvTextOverflowFlags overflow = AdvRetainedTextContract.CheckOverflow(
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options.RightBound, options.BottomBound, right, bottom);
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observed |= overflow;
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if (overflow == AdvTextOverflowFlags.Vertical)
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{
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stopped = true;
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break;
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}
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if (overflow.HasFlag(AdvTextOverflowFlags.Horizontal)
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&& options.WrapHorizontally
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&& (request.Cp932Code == null
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|| !AdvRetainedTextContract.PreventsHorizontalWrapBefore(
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request.Cp932Code.Value)))
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{
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int fontHeight = options.Style.PrimaryFontSize > 0
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? options.Style.PrimaryFontSize
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: request.PixelHeight;
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cursorX = options.LineOriginX;
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cursorY = checked(cursorY + fontHeight + options.Style.LineSpacing);
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wrappedLines++;
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right = checked(cursorX + mask.CellWidth);
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bottom = checked(cursorY + mask.CellHeight);
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}
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AgeGlyphMaskCompositor.DrawGlyph(
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destination, mask, cursorX, cursorY, request.PixelHeight, options.Style);
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records.Add(new AdvRetainedGlyphRecord(0, cursorX, cursorY, right, bottom));
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cursorX = checked(cursorX + mask.CellAdvanceX);
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cursorY = checked(cursorY + mask.CellAdvanceY);
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}
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return new GlyphTextLayoutResult(
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records, cursorX, cursorY, records.Count, wrappedLines, observed, stopped);
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}
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}
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