/// <summary>
/// Add a letter to the layouter.
/// </summary>
/// <param name="c">The letter to add.</param>
/// <param name="g">The atlas glyph corresponding to the letter.</param>
/// <returns>The draw position of the letter.</returns>
public virtual Vector2 AddLetter(char c, out DrawableGlyph g)
{
Vector2 position = GetNextGlyphPosition(_pen, c, out Vector2 drawPosition, out g);
_pen = position;
if (g == null)
{
return(position);
}
_pen.X += g.XAdvance;
return(drawPosition);
}
/// <summary>
/// Add a letter to the layouter.
/// </summary>
/// <param name="c">The letter to add.</param>
/// <param name="g">The atlas glyph corresponding to the letter.</param>
/// <returns>The draw position of the letter.</returns>
public override Vector2 AddLetter(char c, out DrawableGlyph g)
{
if (_newLineIndices.IndexOf(_counter) != -1)
{
NewLine();
}
_counter++;
Vector2 position = base.AddLetter(c, out g);
if (_singleLineNegativeY != 0)
{
position.Y -= _singleLineNegativeY;
}
return(position);
}
public static unsafe DrawableFontAtlas RenderFontStbPacked(byte[] ttf, float fontSize, Vector2 atlasSize, int numChars, Font f, out StbTrueType.stbtt_fontinfo fontInfo)
{
var atlasObj = new DrawableFontAtlas(f, fontSize);
fontSize = atlasObj.FontSize;
fontInfo = new StbTrueType.stbtt_fontinfo();
fixed(byte *ttPtr = &ttf[0])
{
StbTrueType.stbtt_InitFont(fontInfo, ttPtr, 0);
float scaleFactor = StbTrueType.stbtt_ScaleForMappingEmToPixels(fontInfo, fontSize);
int ascent, descent, lineGap;
StbTrueType.stbtt_GetFontVMetrics(fontInfo, &ascent, &descent, &lineGap);
atlasSize *= 3; // Needs to be big as the packing sucks, and glyphs getting cut out messes with the tests.
var pixels = new byte[(int)atlasSize.X * (int)atlasSize.Y];
var pc = new StbTrueType.stbtt_pack_context();
fixed(byte *pixelsPtr = pixels)
{
StbTrueType.stbtt_PackBegin(pc, pixelsPtr, (int)atlasSize.X, (int)atlasSize.Y, (int)atlasSize.X, 1, null);
}
var cd = new StbTrueType.stbtt_packedchar[numChars];
fixed(StbTrueType.stbtt_packedchar *charPtr = cd)
{
StbTrueType.stbtt_PackFontRange(pc, ttPtr, 0, -fontSize, 0, numChars, charPtr);
}
StbTrueType.stbtt_PackEnd(pc);
for (var i = 0; i < cd.Length; ++i)
{
var atlasGlyph = DrawableGlyph.CreateForTest(cd[i].xadvance, cd[i].xoff, cd[i].x1 - cd[i].x0, cd[i].y1 - cd[i].y0);
atlasGlyph.GlyphUV = new Rectangle(cd[i].x0, cd[i].y0, atlasGlyph.Width, atlasGlyph.Height);
atlasObj.Glyphs[(char)i] = atlasGlyph;
}
}
return(atlasObj);
}
/// <summary>
/// Returns the position of the next glyph.
/// </summary>
/// <param name="pen">The position of the pen.</param>
/// <param name="c">The character which is the next glyph.</param>
/// <param name="drawPosition">The position to draw the character at.</param>
/// <param name="g">The atlas glyph corresponding to the provided character, or null if none.</param>
/// <returns>The position of the next glyph along the pen.</returns>
public Vector2 GetNextGlyphPosition(Vector2 pen, char c, out Vector2 drawPosition, out DrawableGlyph g)
{
var result = new Vector2(pen.X, pen.Y);
drawPosition = Vector2.Zero;
g = null;
if (c == '\n')
{
result.X = 0;
result.Y += MathF.Round(_atlas.FontHeight);
}
else
{
if (!_atlas.Glyphs.TryGetValue(c, out g))
{
if (!_hasZeroGlyph)
{
return(result);
}
g = _atlas.Glyphs[(char)0];
}
drawPosition = result;
drawPosition.X += g.XBearing;
}
return(result);
}
public void VerifyFontRendering()
{
var fonts = new[]
{
"Junction-Bold.otf", // Cff
"CaslonOS.otf", // Cff 2 (covers other cases)
"1980XX.ttf", // Ttf
"LatoWeb-Regular.ttf", // Composite
"Junction-Bold.otf", // 14 font size
"Junction-Bold.otf" // 11 font size
};
var names = new[]
{
"Junction-Bold",
"CaslonOS-Regular",
"1980XX",
"Lato Regular",
"Junction-Bold",
"Junction-Bold"
};
var unitsPerEm = new[]
{
1000,
1000,
1024,
2000,
1000,
1000
};
int[] descender =
{
-250,
-360,
-128,
-426,
-250,
-250
};
var ascender = new[]
{
750,
840,
682,
1974,
750,
750
};
var glyphs = new[]
{
270,
279,
141,
2164,
270,
270
};
string[] cachedRender =
{
ResultDb.EmotionCffAtlas,
"",
ResultDb.EmotionTtAtlas,
ResultDb.EmotionCompositeAtlas,
"",
""
};
int[] fontSizes =
{
17,
17,
17,
17,
14,
11
};
FrameBuffer b = null;
for (var i = 0; i < fonts.Length; i++)
{
Engine.Log.Info($"Running font {fonts[i]} ({i})...", TestRunnerLogger.TestRunnerSrc);
ReadOnlyMemory <byte> data = Engine.AssetLoader.Get <OtherAsset>($"Fonts/{fonts[i]}")?.Content ?? ReadOnlyMemory <byte> .Empty;
var f = new Font(data);
// Verify basic font data.
Assert.True(f.Valid);
Assert.True(f.FullName == names[i]);
Assert.True(f.UnitsPerEm == unitsPerEm[i]);
Assert.True(f.Descender == descender[i]);
Assert.True(f.Ascender == ascender[i]);
Assert.True(f.CharToGlyph.Count == glyphs[i]);
// Get atlases.
int fontSize = fontSizes[i];
var emotionAtlas = new StbDrawableFontAtlas(f, fontSize, false);
Runner.ExecuteAsLoop(_ =>
{
var str = "";
for (uint j = emotionAtlas.Font.FirstCharIndex; j < emotionAtlas.Font.LastCharIndex; j++)
{
str += (char)j;
}
emotionAtlas.CacheGlyphs(str);
}).WaitOne();
DrawableFontAtlas packedStbAtlas = RenderFontStbPacked(data.ToArray(), fontSize, emotionAtlas.Texture.Size * 3, (int)f.LastCharIndex + 1, f, out StbTrueType.stbtt_fontinfo stbFont);
// Compare glyph parsing.
CompareMetricsWithStb(f, emotionAtlas, stbFont);
// Compare render metrics.
foreach (KeyValuePair <char, DrawableGlyph> g in emotionAtlas.Glyphs)
{
DrawableGlyph glyph = packedStbAtlas.Glyphs[g.Key];
Assert.Equal(glyph.XAdvance, g.Value.XAdvance);
var fontGlyph = g.Value.FontGlyph;
int width = (int)(MathF.Ceiling(fontGlyph.Max.X * emotionAtlas.RenderScale) - MathF.Floor(fontGlyph.Min.X * emotionAtlas.RenderScale));
int height = (int)(MathF.Ceiling(-fontGlyph.Min.Y * emotionAtlas.RenderScale) - MathF.Floor(-fontGlyph.Max.Y * emotionAtlas.RenderScale));
Assert.Equal(glyph.Width, width);
Assert.Equal(glyph.Height, height);
}
// Check if there's a verified render.
if (string.IsNullOrEmpty(cachedRender[i]))
{
continue;
}
// Compare with cached render.
// ReSharper disable AccessToModifiedClosure
Runner.ExecuteAsLoop(_ =>
{
if (b == null)
{
b = new FrameBuffer(emotionAtlas.Texture.Size).WithColor();
}
else
{
b.Resize(emotionAtlas.Texture.Size, true);
}
RenderComposer composer = Engine.Renderer.StartFrame();
composer.RenderToAndClear(b);
composer.RenderSprite(Vector3.Zero, emotionAtlas.Texture.Size, Color.White, emotionAtlas.Texture);
composer.RenderTo(null);
Engine.Renderer.EndFrame();
Runner.VerifyScreenshot(cachedRender[i], b);
}).WaitOne();
}
}
public static void RenderGlyph(Font font, StbGlyphCanvas canvas, DrawableGlyph glyph, float scale, bool invertY = false)
{
if (scale == 0f)
{
return;
}
if (canvas.Width == 0 || canvas.Height == 0)
{
return;
}
const float flatnessInPixels = 0.35f;
Vector2[]? windings = FlattenCurves(glyph.FontGlyph.Commands, flatnessInPixels / scale, out int[]? contourLengths);
if (windings == null || contourLengths == null)
{
return;
}
float scaleX = scale;
float scaleY = scale;
if (invertY)
{
scaleY = -scaleY;
}
int n = contourLengths.Sum();
var e = new StbRendererGlyphEdge[n + 1];
n = 0;
var wOffset = 0;
var subSample = 1;
for (var i = 0; i < contourLengths.Length; i++)
{
int j = contourLengths[i] - 1;
for (var k = 0; k < contourLengths[i]; j = k++)
{
int a = k;
int b = j;
if (windings[wOffset + j].Y == windings[wOffset + k].Y)
{
continue;
}
e[n].Invert = false;
if (invertY && windings[wOffset + j].Y > windings[wOffset + k].Y || !invertY && windings[wOffset + j].Y < windings[wOffset + k].Y)
{
e[n].Invert = true;
a = j;
b = k;
}
e[n].X = windings[wOffset + a].X * scaleX;
e[n].Y = windings[wOffset + a].Y * scaleY * subSample;
e[n].X1 = windings[wOffset + b].X * scaleX;
e[n].Y1 = windings[wOffset + b].Y * scaleY * subSample;
n++;
}
wOffset += contourLengths[i];
}
Array.Resize(ref e, n + 1); // todo
QuickSortEdges(new Span <StbRendererGlyphEdge>(e), n);
// Insert Sort
for (var i = 1; i < n; i++)
{
StbRendererGlyphEdge t = e[i];
int j = i;
while (j > 0)
{
ref StbRendererGlyphEdge b = ref e[j - 1];
if (!(t.Y < b.Y))
{
break;
}
e[j] = e[j - 1];
j--;
}
if (i != j)
{
e[j] = t;
}
}
public static void RenderGlyphs(Font font, RenderComposer composer, List <DrawableGlyph> glyphs, Vector3 offset, uint clr, float scale, Rectangle[]?dstRects = null)
{
for (var c = 0; c < glyphs.Count; c++)
{
DrawableGlyph atlasGlyph = glyphs[c];
FontGlyph fontGlyph = atlasGlyph.FontGlyph;
Rectangle dst = dstRects != null ? dstRects[c] : atlasGlyph.GlyphUV;
if (CLIP_GLYPH_TEXTURES)
{
composer.SetClipRect(dst);
}
float baseline = font.Descender * scale;
Vector3 atlasRenderPos = (dst.Position - new Vector2(atlasGlyph.XBearing, baseline)).ToVec3();
atlasRenderPos += offset;
composer.PushModelMatrix(Matrix4x4.CreateScale(scale, scale, 1) * Matrix4x4.CreateTranslation(atlasRenderPos));
// Count vertices.
GlyphDrawCommand[]? commands = fontGlyph.Commands;
if (commands == null)
{
continue;
}
var verticesCount = 0;
for (var v = 0; v < commands.Length; v++)
{
GlyphDrawCommand currentCommand = commands[v];
if (currentCommand.Type != GlyphDrawCommandType.Move)
{
verticesCount++;
}
}
// Draw lines between all vertex points.
Span <VertexData> lines = composer.RenderStream.GetStreamMemory((uint)(verticesCount * 3), BatchMode.SequentialTriangles);
for (var j = 0; j < lines.Length; j++)
{
lines[j].UV = Vector2.Zero;
lines[j].Color = clr;
}
Vector3 prevPos = Vector3.Zero;
int currentContourStart = -1;
var currentVertIdx = 0;
for (var i = 0; i < commands.Length; i++)
{
GlyphDrawCommand currentCommand = commands[i];
if (currentContourStart == -1)
{
currentContourStart = i;
}
if (currentCommand.Type != GlyphDrawCommandType.Move)
{
Vector3 currentVertPos = currentCommand.P0.ToVec3();
if (currentCommand.Type == GlyphDrawCommandType.Close)
{
GlyphDrawCommand startingVert = commands[currentContourStart];
currentVertPos = startingVert.P0.ToVec3();
currentContourStart = -1;
}
lines[currentVertIdx].Vertex = Vector3.Zero;
currentVertIdx++;
lines[currentVertIdx].Vertex = currentVertPos;
currentVertIdx++;
lines[currentVertIdx].Vertex = prevPos;
currentVertIdx++;
}
prevPos = currentCommand.P0.ToVec3();
}
// Draw curves. These will flip pixels in the curve approximations from above.
for (var i = 0; i < commands.Length; i++)
{
GlyphDrawCommand currentCommand = commands[i];
if (currentCommand.Type == GlyphDrawCommandType.Curve)
{
Span <VertexData> memory = composer.GetStreamedQuadraticCurveMesh(prevPos, currentCommand.P0.ToVec3(), currentCommand.P1.ToVec3());
for (var j = 0; j < memory.Length; j++)
{
memory[j].UV = Vector2.Zero;
memory[j].Color = clr;
}
}
prevPos = currentCommand.P0.ToVec3();
}
composer.PopModelMatrix();
if (CLIP_GLYPH_TEXTURES)
{
composer.SetClipRect(null);
}
}
}