internal bool pack(MaxRectsBinPack spc)
{
was_packed = false;
if (w == 0 || h == 0)
{
return(false);
}
var r = spc.Insert(w, h, MaxRectsBinPack.FreeRectChoiceHeuristic.RectBestAreaFit);
if (r.width == 0 || r.height == 0)
{
return(false);
}
x = (int)r.x;
y = (int)r.y;
was_packed = true;
return(true);
}
//public ImRect[] PackFont(MaxRectsBinPack packer, Texture2D texture, Texture2D[] textures, int width, int height, int maxSize)
//{
// if (width > maxSize && height > maxSize) return null;
// if (width > maxSize || height > maxSize) { int temp = width; width = height; height = temp; }
// MaxRectsBinPack bp = new MaxRectsBinPack(width, height);
// ImRect[] rects = new ImRect[textures.Length];
// for (int i = 0; i < textures.Length; i++)
// {
// Texture2D tex = textures[i];
// ImRect rect = bp.Insert(tex.width, tex.height, MaxRectsBinPack.FreeRectChoiceHeuristic.RectBestAreaFit);
// if (rect.width == 0 || rect.height == 0)
// {
// return PackTextures(texture, textures, width * (width <= height ? 2 : 1), height * (height < width ? 2 : 1), maxSize);
// }
// rects[i] = rect;
// }
// texture.Resize(width, height);
// texture.SetPixels(new ImColor[width * height]);
// for (int i = 0; i < textures.Length; i++)
// {
// Texture2D tex = textures[i];
// ImRect rect = rects[i];
// ImColor[] colors = tex.GetPixels();
// if (rect.width != tex.width)
// {
// ImColor[] newColors = tex.GetPixels();
// for (int x = 0; x < rect.width; x++)
// {
// for (int y = 0; y < rect.height; y++)
// {
// int prevIndex = ((int)rect.height - (y + 1)) + x * (int)tex.width;
// newColors[x + y * (int)rect.width] = colors[prevIndex];
// }
// }
// colors = newColors;
// }
// texture.SetPixels((int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height, colors);
// rect.x /= width;
// rect.y /= height;
// rect.width /= width;
// rect.height /= height;
// rects[i] = rect;
// }
// return rects;
//}
internal bool Build()
{
System.Diagnostics.Debug.Assert(ConfigData.Size > 0);
TexID = null;
TexWidth = TexHeight = 0;
TexUvWhitePixel = new ImVec2(0, 0);
ClearTexData();
int total_glyph_count = 0;
int total_glyph_range_count = 0;
for (int input_i = 0; input_i < ConfigData.Size; input_i++)
{
ImFontConfig cfg = ConfigData[input_i];
System.Diagnostics.Debug.Assert(cfg.DstFont != null && (!cfg.DstFont.IsLoaded() || cfg.DstFont.ContainerAtlas == this));
System.Diagnostics.Debug.Assert(cfg.FontData != null);
// Count glyphs
if (cfg.GlyphRanges == null)
{
cfg.GlyphRanges = GetGlyphRangesDefault();
}
for (int in_range = 0; cfg.GlyphRanges[in_range] > 0 && cfg.GlyphRanges[in_range + 1] > 0; in_range += 2)
{
total_glyph_count += (cfg.GlyphRanges[in_range + 1] - cfg.GlyphRanges[in_range]) + 1;
total_glyph_range_count++;
}
}
// Start packing. We need a known width for the skyline algorithm. Using a cheap heuristic here to decide of width. User can override TexDesiredWidth if they wish.
// After packing is done, width shouldn't matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyph_count > 4000) ? 4096 : (total_glyph_count > 2000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512;
TexHeight = 0;
int max_tex_height = 1024 * 32;
var spc = new MaxRectsBinPack(TexWidth, max_tex_height, false);
ImVector <ImFontPackingRect> rects = new ImVector <ImFontPackingRect>();
RenderCustomTexData(spc, 0, rects);
// First font pass: pack all glyphs (no rendering at this point, we are working with rectangles in an infinitely tall texture at this point)
for (int input_i = 0; input_i < ConfigData.Size; input_i++)
{
ImFontConfig cfg = ConfigData[input_i];
cfg.Face.SetPixelSizes((uint)(cfg.SizePixels * cfg.OversampleH), (uint)(cfg.SizePixels * cfg.OversampleV));
for (int in_range = 0; cfg.GlyphRanges[in_range] > 0 && cfg.GlyphRanges[in_range + 1] > 0; in_range += 2)
{
var glyphs = new List <ImRect>((cfg.GlyphRanges[in_range + 1] - cfg.GlyphRanges[in_range]) + 1);
var packedGlyphs = new List <ImRect>((cfg.GlyphRanges[in_range + 1] - cfg.GlyphRanges[in_range]) + 1);
for (var range = cfg.GlyphRanges[in_range]; range <= cfg.GlyphRanges[in_range + 1]; range++)
{
char c = (char)range;
uint glyphIndex = cfg.Face.GetCharIndex(c);
cfg.Face.LoadGlyph(glyphIndex, LoadFlags.Default, LoadTarget.Normal);
//added padding to keep from bleeding
glyphs.Add(new ImRect(0, 0, (int)cfg.Face.Glyph.Metrics.Width + 2, (int)cfg.Face.Glyph.Metrics.Height + 2));
spc.Insert((int)cfg.Face.Glyph.Metrics.Width + 2, (int)cfg.Face.Glyph.Metrics.Height + 2, MaxRectsBinPack.FreeRectChoiceHeuristic.RectBestAreaFit);
}
spc.Insert(glyphs, packedGlyphs, MaxRectsBinPack.FreeRectChoiceHeuristic.RectBestAreaFit);
System.Diagnostics.Debug.Assert(glyphs.Count == packedGlyphs.Count);
for (var i = 0; i < glyphs.Count; i++)
{
var c = (cfg.GlyphRanges[in_range] + i);
var g = glyphs[i];
var pg = packedGlyphs[i];
var was_packed = pg.width > 0 && pg.height > 0;
var r = new ImFontPackingRect()
{
id = c,
x = (int)pg.x + 1,
y = (int)pg.y + 1,
w = (int)pg.width,
h = (int)pg.height,
was_packed = was_packed
};
if (was_packed)
{
TexHeight = ImGui.Max(TexHeight, r.y + r.h);
}
rects.push_back(r);
}
}
}
// Create texture
TexHeight = ImGui.UpperPowerOfTwo(TexHeight);
TexPixelsAlpha8 = new byte[TexWidth * TexHeight];
for (int input_i = 0; input_i < ConfigData.Size; input_i++)
{
ImFontConfig cfg = ConfigData[input_i];
ImFont dst_font = cfg.DstFont;
int unscaled_ascent = cfg.Face.Ascender,
unscaled_descent = cfg.Face.Descender;
float font_scale = cfg.SizePixels / (unscaled_ascent - unscaled_descent); //taken from stbtt_ScaleForPixelHeight
var max_height = cfg.Face.Height * font_scale;
float ascent = unscaled_ascent * font_scale;
float descent = unscaled_descent * font_scale;
if (!cfg.MergeMode)
{
dst_font.ContainerAtlas = this;
dst_font.ConfigData = cfg;
dst_font.ConfigDataCount = 0;
dst_font.FontSize = cfg.SizePixels;
dst_font.Ascent = ascent;
dst_font.Descent = descent;
dst_font.Glyphs.resize(0);
}
dst_font.ConfigDataCount++;
float off_y = (cfg.MergeMode && cfg.MergeGlyphCenterV) ? (ascent - dst_font.Ascent) * 0.5f : 0.0f;
//render
for (var i = 0; i < rects.Size; i++)
{
var rect = rects[i];
//if (rect.id > 0 /*&& rect.was_packed*/)
{
var codepoint = (ushort)rect.id;
if (cfg.MergeMode && dst_font.HasGlyph((char)codepoint))
{
continue;
}
uint glyphIndex = cfg.Face.GetCharIndex(codepoint);
cfg.Face.LoadGlyph(glyphIndex, LoadFlags.Render, LoadTarget.Normal);
cfg.Face.Glyph.RenderGlyph(RenderMode.Normal);
var bmp = cfg.Face.Glyph.Bitmap;
for (var x = 0; x < bmp.Width; x++)
{
for (var y = 0; y < bmp.Rows; y++)
{
TexPixelsAlpha8[(rect.x + x) + ((rect.y + y) * TexWidth)] = bmp.BufferData[x + y * bmp.Pitch];
}
}
}
}
cfg.Face.SetPixelSizes((uint)cfg.SizePixels, (uint)cfg.SizePixels);
//need to calculate origin/baseline
var top = 0f;
var bot = 0f;
for (var i = 0; i < rects.Size; i++)
{
var rect = rects[i];
//if (rect.id > 0 /*&& rect.was_packed*/)
{
var codepoint = (ushort)rect.id;
if (cfg.MergeMode && dst_font.HasGlyph((char)codepoint))
{
continue;
}
uint glyphIndex = cfg.Face.GetCharIndex(codepoint);
cfg.Face.LoadGlyph(glyphIndex, LoadFlags.ComputeMetrics, LoadTarget.Normal);
var glyphTop = (float)cfg.Face.Glyph.Metrics.HorizontalBearingY;
var glyphBot = (float)(cfg.Face.Glyph.Metrics.Height - cfg.Face.Glyph.Metrics.HorizontalBearingY);
if (glyphTop > top)
{
top = glyphTop;
}
if (glyphBot > bot)
{
bot = glyphBot;
}
}
}
//dst_font.FallbackGlyph = null; // Always clear fallback so FindGlyph can return NULL. It will be set again in BuildLookupTable()
for (var i = 0; i < rects.Size; i++)
{
var rect = rects[i];
//if (rect.id > 0 /*&& rect.was_packed*/)
{
var codepoint = (ushort)rect.id;
if (cfg.MergeMode && dst_font.HasGlyph((char)codepoint))
{
continue;
}
uint glyphIndex = cfg.Face.GetCharIndex(codepoint);
cfg.Face.LoadGlyph(glyphIndex, LoadFlags.ComputeMetrics, LoadTarget.Normal);
dst_font.Glyphs.resize(dst_font.Glyphs.Size + 1);
var glyph = dst_font.Glyphs[dst_font.Glyphs.Size - 1];
glyph.Codepoint = codepoint;
glyph.X0 = (int)cfg.Face.Glyph.Metrics.HorizontalBearingX + (float)cfg.Face.Glyph.BitmapLeft;
glyph.X1 = (int)cfg.Face.Glyph.Metrics.Width + glyph.X0;
glyph.Y0 = top - (float)cfg.Face.Glyph.Metrics.HorizontalBearingY;
glyph.Y1 = glyph.Y0 + (float)cfg.Face.Glyph.Metrics.Height;
glyph.U0 = rect.x / (float)TexWidth;
glyph.V0 = rect.y / (float)TexHeight;
glyph.U1 = (rect.x + rect.w) / (float)TexWidth;
glyph.V1 = (rect.y + rect.h) / (float)TexHeight;
glyph.XAdvance = ((int)cfg.Face.Glyph.Metrics.HorizontalAdvance + cfg.GlyphExtraSpacing.x); // Bake spacing into XAdvance
if (cfg.PixelSnapH)
{
glyph.XAdvance = (int)(glyph.XAdvance + 0.5f);
}
dst_font.Glyphs[dst_font.Glyphs.Size - 1] = glyph;
}
}
cfg.DstFont.BuildLookupTable();
}
// Cleanup temporaries
//ImGui::MemFree(buf_packedchars);
//ImGui::MemFree(buf_ranges);
//ImGui::MemFree(tmp_array);
// Render into our custom data block
RenderCustomTexData(spc, 1, rects);
return(true);
}