/// <summary>
/// Gets a <see cref="FontBitmap"/>'s intance.
/// </summary>
/// <param name="font"></param>
/// <param name="charSet"></param>
/// <param name="drawBoundary"></param>
/// <returns></returns>
public static FontBitmap GetFontBitmap(this Font font, string charSet, bool drawBoundary = false)
{
var fontBitmap = new FontBitmap();
fontBitmap.GlyphFont = font;
// 以下几步，不能调换先后顺序。
// Don't change the order in which these functions invoked.
int singleCharWidth, singleCharHeight;
PrepareInitialGlyphDict(fontBitmap, charSet, out singleCharWidth, out singleCharHeight);
int width, height;
PrepareFinalBitmapSize(fontBitmap, out width, out height);
PrintBitmap(fontBitmap, singleCharWidth, singleCharHeight, width, height);
if (drawBoundary)
{
using (var graphics = Graphics.FromImage(fontBitmap.GlyphBitmap))
{
bool odd = false;
foreach (GlyphInfo item in fontBitmap.GlyphInfoDictionary.Values)
{
graphics.DrawRectangle(
odd ? Pens.Green : Pens.Blue,
item.ToRectangle(1, 1, -2, -1));
odd = !odd;
}
graphics.DrawRectangle(Pens.Red, 0, 0, fontBitmap.GlyphBitmap.Width - 1, fontBitmap.GlyphBitmap.Height - 1);
}
}
return(fontBitmap);
}
/// <summary>
/// prepare final bitmap's size.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="width">final bitmap's width.</param>
/// <param name="height">final bitmap's height.</param>
private static void PrepareFinalBitmapSize(FontBitmap fontBitmap, out int width, out int height)
{
int sideLength;
int maxGlyphHeight = 0;
{
int totalWidth = 0;
foreach (GlyphInfo item in fontBitmap.GlyphInfoDictionary.Values)
{
totalWidth += item.width + glyphInterval;
if (maxGlyphHeight < item.height)
{
maxGlyphHeight = item.height;
}
}
int area = totalWidth * maxGlyphHeight;
sideLength = (int)Math.Ceiling(Math.Sqrt(area));
fontBitmap.GlyphHeight = maxGlyphHeight;
}
{
int maxWidth = 0, maxHeight = 0;
int currentX = leftMargin, currentY = 0;
foreach (var item in fontBitmap.GlyphInfoDictionary)
{
if (currentX + item.Value.width < sideLength)
{
currentX += item.Value.width + glyphInterval;
}
else// new row will start.
{
if (maxWidth < currentX)
{
maxWidth = currentX;
}
currentX = leftMargin;
currentY += maxGlyphHeight;
currentX += item.Value.width + glyphInterval;
}
}
// if there is no glyph
// or if there is only 1 line of glyph.
if (maxWidth < currentX)
{
maxWidth = currentX;
}
if (currentX > leftMargin)// last line is not finished.
{
maxHeight = currentY + maxGlyphHeight;
}
else// last line is finished and new line is started and new line has no glyph.
{
maxHeight = currentY;
}
width = maxWidth;
height = maxHeight;
}
}
private static FontTexture InitializeDefaultFontTexture()
{
Font font = new Font("Arial", 64.0f, FontStyle.Regular, GraphicsUnit.Pixel);// SystemFonts.DefaultFont;
FontBitmap fontBitmap = font.GetFontBitmap(defaultCharSet);
FontTexture fontTexture = fontBitmap.GetFontTexture();
return(fontTexture);
}
/// <summary>
/// Get glyph's size by graphics.MeasureString().
/// Then shrink glyph's size.
/// xoffset now means offset in a single glyph's bitmap.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="charSet"></param>
/// <param name="singleCharWidth"></param>
/// <param name="singleCharHeight"></param>
private static void PrepareInitialGlyphDict(FontBitmap fontBitmap, string charSet, out int singleCharWidth, out int singleCharHeight)
{
// Get glyph's size by graphics.MeasureString().
{
int maxWidth = 0, maxHeight = 0;
float fontSize = fontBitmap.GlyphFont.Size;
using (var bitmap = new Bitmap(1, 1, PixelFormat.Format24bppRgb))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
foreach (char c in charSet)
{
SizeF size = graphics.MeasureString(c.ToString(), fontBitmap.GlyphFont);
var info = new GlyphInfo(0, 0, (int)size.Width, (int)size.Height);
fontBitmap.GlyphInfoDictionary.Add(c, info);
if (maxWidth < (int)size.Width)
{
maxWidth = (int)size.Width;
}
if (maxHeight < (int)size.Height)
{
maxHeight = (int)size.Height;
}
}
}
}
singleCharWidth = maxWidth;
singleCharHeight = maxHeight;
}
// shrink glyph's size.
// xoffset now means offset in a single glyph's bitmap.
{
using (var bitmap = new Bitmap(singleCharWidth, singleCharHeight))
{
using (var graphics = Graphics.FromImage(bitmap))
{
Color clearColor = Color.FromArgb(0, 0, 0, 0);
foreach (var item in fontBitmap.GlyphInfoDictionary)
{
if (item.Key == ' ' || item.Key == '\t' || item.Key == '\r' || item.Key == '\n')
{
continue;
}
graphics.Clear(clearColor);
graphics.DrawString(item.Key.ToString(), fontBitmap.GlyphFont, Brushes.White, 0, 0);
BitmapData data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
RetargetGlyphRectangleInwards(data, item.Value);
bitmap.UnlockBits(data);
}
}
}
}
}
/// <summary>
/// prepare final bitmap's size.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="width">final bitmap's width.</param>
/// <param name="height">final bitmap's height.</param>
private static void PrepareFinalBitmapSize(FontBitmap fontBitmap, out int width, out int height)
{
int sideLength;
int maxGlyphHeight = 0;
{
int totalWidth = 0;
foreach (GlyphInfo item in fontBitmap.GlyphInfoDictionary.Values)
{
totalWidth += item.width + glyphInterval;
if (maxGlyphHeight < item.height) { maxGlyphHeight = item.height; }
}
int area = totalWidth * maxGlyphHeight;
sideLength = (int)Math.Ceiling(Math.Sqrt(area));
fontBitmap.GlyphHeight = maxGlyphHeight;
}
{
int maxWidth = 0, maxHeight = 0;
int currentX = leftMargin, currentY = 0;
foreach (KeyValuePair<char, GlyphInfo> item in fontBitmap.GlyphInfoDictionary)
{
if (currentX + item.Value.width < sideLength)
{
currentX += item.Value.width + glyphInterval;
}
else// new row will start.
{
if (maxWidth < currentX) { maxWidth = currentX; }
currentX = leftMargin;
currentY += maxGlyphHeight;
currentX += item.Value.width + glyphInterval;
}
}
// if there is no glyph
// or if there is only 1 line of glyph.
if (maxWidth < currentX) { maxWidth = currentX; }
if (currentX > leftMargin)// last line is not finished.
{
maxHeight = currentY + maxGlyphHeight;
}
else// last line is finished and new line is started and new line has no glyph.
{
maxHeight = currentY;
}
width = maxWidth;
height = maxHeight;
}
}
/// <summary>
/// Get glyph's size by graphics.MeasureString().
/// Then shrink glyph's size.
/// xoffset now means offset in a single glyph's bitmap.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="charSet"></param>
/// <param name="singleCharWidth"></param>
/// <param name="singleCharHeight"></param>
private static void PrepareInitialGlyphDict(FontBitmap fontBitmap, string charSet, out int singleCharWidth, out int singleCharHeight)
{
// Get glyph's size by graphics.MeasureString().
{
int maxWidth = 0, maxHeight = 0;
float fontSize = fontBitmap.GlyphFont.Size;
using (var bitmap = new Bitmap(1, 1, PixelFormat.Format24bppRgb))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
foreach (char c in charSet)
{
SizeF size = graphics.MeasureString(c.ToString(), fontBitmap.GlyphFont);
var info = new GlyphInfo(0, 0, (int)size.Width, (int)size.Height);
fontBitmap.GlyphInfoDictionary.Add(c, info);
if (maxWidth < (int)size.Width) { maxWidth = (int)size.Width; }
if (maxHeight < (int)size.Height) { maxHeight = (int)size.Height; }
}
}
}
singleCharWidth = maxWidth;
singleCharHeight = maxHeight;
}
// shrink glyph's size.
// xoffset now means offset in a single glyph's bitmap.
{
using (var bitmap = new Bitmap(singleCharWidth, singleCharHeight))
{
using (var graphics = Graphics.FromImage(bitmap))
{
Color clearColor = Color.FromArgb(0, 0, 0, 0);
foreach (KeyValuePair<char, GlyphInfo> item in fontBitmap.GlyphInfoDictionary)
{
if (item.Key == ' ' || item.Key == '\t' || item.Key == '\r' || item.Key == '\n') { continue; }
graphics.Clear(clearColor);
graphics.DrawString(item.Key.ToString(), fontBitmap.GlyphFont, Brushes.White, 0, 0);
BitmapData data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
RetargetGlyphRectangleInwards(data, item.Value);
bitmap.UnlockBits(data);
}
}
}
}
}
/// <summary>
/// Gets an instance of <see cref="FontTexture"/>.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="parameters"></param>
/// <param name="mipmapFiltering"></param>
/// <returns></returns>
public static FontTexture GetFontTexture(this FontBitmap fontBitmap,
SamplerParameters parameters = null,
MipmapFilter mipmapFiltering = MipmapFilter.LinearMipmapLinear)
{
var texture = new Texture(fontBitmap.GlyphBitmap,
parameters, mipmapFiltering);
texture.Initialize();
var result = new FontTexture();
result.GlyphFont = fontBitmap.GlyphFont;
result.GlyphHeight = fontBitmap.GlyphHeight;
result.TextureSize = fontBitmap.GlyphBitmap.Size;
result.GlyphInfoDictionary = fontBitmap.GlyphInfoDictionary;
result.TextureObj = texture;
return(result);
}
/// <summary>
/// Print the final bitmap that contains all glyphs.
/// And also setup glyph's xoffset, yoffset.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="singleCharWidth"></param>
/// <param name="singleCharHeight"></param>
/// <param name="width"></param>
/// <param name="height"></param>
private static void PrintBitmap(FontBitmap fontBitmap, int singleCharWidth, int singleCharHeight, int width, int height)
{
var bitmap = new Bitmap(width, height);
using (var graphics = Graphics.FromImage(bitmap))
{
using (var glyphBitmap = new Bitmap(singleCharWidth, singleCharHeight))
{
using (var glyphGraphics = Graphics.FromImage(glyphBitmap))
{
int currentX = leftMargin, currentY = 0;
Color clearColor = Color.FromArgb(0, 0, 0, 0);
foreach (KeyValuePair <char, GlyphInfo> item in fontBitmap.GlyphInfoDictionary)
{
glyphGraphics.Clear(clearColor);
glyphGraphics.DrawString(item.Key.ToString(), fontBitmap.GlyphFont,
Brushes.White, 0, 0);
// move to new line if this line is full.
if (currentX + item.Value.width > width)
{
currentX = leftMargin;
currentY += singleCharHeight;
}
// draw the current glyph.
graphics.DrawImage(glyphBitmap,
new Rectangle(currentX, currentY, item.Value.width, item.Value.height),
item.Value.ToRectangle(),
GraphicsUnit.Pixel);
// move line cursor to next(right) position.
item.Value.xoffset = currentX;
item.Value.yoffset = currentY;
// prepare for next glyph's position.
currentX += item.Value.width + glyphInterval;
}
}
}
}
fontBitmap.GlyphBitmap = bitmap;
}
/// <summary>
/// Print the final bitmap that contains all glyphs.
/// And also setup glyph's xoffset, yoffset.
/// </summary>
/// <param name="fontBitmap"></param>
/// <param name="singleCharWidth"></param>
/// <param name="singleCharHeight"></param>
/// <param name="width"></param>
/// <param name="height"></param>
private static void PrintBitmap(FontBitmap fontBitmap, int singleCharWidth, int singleCharHeight, int width, int height)
{
var bitmap = new Bitmap(width, height);
using (var graphics = Graphics.FromImage(bitmap))
{
using (var glyphBitmap = new Bitmap(singleCharWidth, singleCharHeight))
{
using (var glyphGraphics = Graphics.FromImage(glyphBitmap))
{
int currentX = leftMargin, currentY = 0;
Color clearColor = Color.FromArgb(0, 0, 0, 0);
foreach (KeyValuePair<char, GlyphInfo> item in fontBitmap.GlyphInfoDictionary)
{
glyphGraphics.Clear(clearColor);
glyphGraphics.DrawString(item.Key.ToString(), fontBitmap.GlyphFont,
Brushes.White, 0, 0);
// move to new line if this line is full.
if (currentX + item.Value.width > width)
{
currentX = leftMargin;
currentY += singleCharHeight;
}
// draw the current glyph.
graphics.DrawImage(glyphBitmap,
new Rectangle(currentX, currentY, item.Value.width, item.Value.height),
item.Value.ToRectangle(),
GraphicsUnit.Pixel);
// move line cursor to next(right) position.
item.Value.xoffset = currentX;
item.Value.yoffset = currentY;
// prepare for next glyph's position.
currentX += item.Value.width + glyphInterval;
}
}
}
}
fontBitmap.GlyphBitmap = bitmap;
}
/// <summary>
/// Gets a <see cref="FontBitmap"/>'s intance.
/// </summary>
/// <param name="font">建议最大字体不超过32像素高度，否则可能无法承载所有Unicode字符。</param>
/// <param name="charSet"></param>
/// <param name="drawBoundary"></param>
/// <returns></returns>
public static FontBitmap GetFontBitmap(this Font font, string charSet, bool drawBoundary = false)
{
var fontBitmap = new FontBitmap();
fontBitmap.GlyphFont = font; //fontBitmap.GlyphInfoDictionary //fontBitmap.GlyphHeight //fontBitmap.GlyphBitmap
// 先获取各个glyph的width和height
fontBitmap.GlyphInfoDictionary = GetGlyphDict(font, charSet);
// 获取所有glyph的面积之和，开方得到最终贴图的宽度textureWidth
int textureWidth = GetTextureWidth(fontBitmap.GlyphInfoDictionary);
// 以所有glyph中height最大的为标准高度
fontBitmap.GlyphHeight = GetGlyphHeight(fontBitmap.GlyphInfoDictionary, textureWidth);
// 摆放glyph，得到x偏移和y偏移量，同时顺便得到最终贴图的高度textureHeight
int textureHeight = LayoutGlyphs(fontBitmap.GlyphInfoDictionary, textureWidth, fontBitmap.GlyphHeight);
// 根据glyph的摆放位置，生成最终的贴图
fontBitmap.GlyphBitmap = PaintTexture(textureWidth, textureHeight, fontBitmap.GlyphInfoDictionary, font);
if (drawBoundary)
{
using (var graphics = Graphics.FromImage(fontBitmap.GlyphBitmap))
{
bool odd = false;
foreach (GlyphInfo item in fontBitmap.GlyphInfoDictionary.Values)
{
graphics.DrawRectangle(
odd ? Pens.Green : Pens.Blue,
item.ToRectangle(1, 1, -2, -1));
odd = !odd;
}
graphics.DrawRectangle(Pens.Red, 0, 0, fontBitmap.GlyphBitmap.Width - 1, fontBitmap.GlyphBitmap.Height - 1);
}
}
//fontBitmap.GlyphBitmap.Save("aaaaaaaaaaaaa.png");
return(fontBitmap);
}
