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using System;
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using System.Runtime.InteropServices;
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using static StbTrueTypeSharp.StbTrueType;
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namespace FontStashSharp
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{
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internal unsafe class Font: IDisposable
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{
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private readonly byte[] Data;
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private GCHandle? dataPtr = null;
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private float AscentBase, DescentBase, LineHeightBase;
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public float Ascent { get; private set; }
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public float Descent { get; private set; }
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public float LineHeight { get; private set; }
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public float Scale { get; private set; }
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public stbtt_fontinfo _font = new stbtt_fontinfo();
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public Font(byte[] data)
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{
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if (data == null)
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{
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throw new ArgumentNullException(nameof(data));
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}
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Data = data;
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dataPtr = GCHandle.Alloc(data, GCHandleType.Pinned);
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}
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~Font()
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{
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Dispose();
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}
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public void Dispose()
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{
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if (dataPtr != null)
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{
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dataPtr.Value.Free();
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dataPtr = null;
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}
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}
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public void Recalculate(float size)
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{
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Ascent = AscentBase * size;
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Descent = DescentBase * size;
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LineHeight = LineHeightBase * size;
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Scale = stbtt_ScaleForPixelHeight(_font, size);
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}
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public int GetGlyphIndex(int codepoint)
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{
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return stbtt_FindGlyphIndex(_font, codepoint);
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}
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public void BuildGlyphBitmap(int glyph, float size, float scale, ref int advance, ref int lsb, ref int x0, ref int y0, ref int x1, ref int y1)
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{
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int advanceTemp, lsbTemp;
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stbtt_GetGlyphHMetrics(_font, glyph, &advanceTemp, &lsbTemp);
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advance = advanceTemp;
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lsb = lsbTemp;
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int x0Temp, y0Temp, x1Temp, y1Temp;
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stbtt_GetGlyphBitmapBox(_font, glyph, scale, scale, &x0Temp, &y0Temp, &x1Temp, &y1Temp);
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x0 = x0Temp;
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y0 = y0Temp;
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x1 = x1Temp;
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y1 = y1Temp;
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}
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public void RenderGlyphBitmap(byte[] output, int outWidth, int outHeight, int outStride, int glyph)
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{
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fixed (byte* outputPtr = output)
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{
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stbtt_MakeGlyphBitmap(_font, outputPtr, outWidth, outHeight, outStride, Scale, Scale, glyph);
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}
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}
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public static Font FromMemory(byte[] data)
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{
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var font = new Font(data);
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byte* dataPtr = (byte *)font.dataPtr.Value.AddrOfPinnedObject();
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if (stbtt_InitFont(font._font, dataPtr, 0) == 0)
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throw new Exception("stbtt_InitFont failed");
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int ascent, descent, lineGap;
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stbtt_GetFontVMetrics(font._font , &ascent, &descent, &lineGap);
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var fh = ascent - descent;
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font.AscentBase = ascent / (float)fh;
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font.DescentBase = descent / (float)fh;
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font.LineHeightBase = (fh + lineGap) / (float)fh;
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return font;
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}
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}
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}
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