public SimpleUIPointSpriteStringElement(IUILayoutParam param,
string content, vec3 position,
GLColor color = null, int fontSize = 32, int maxRowWidth = 256, FontResource fontResource = null)
{
IUILayout layout = this;
layout.Param = param;
this.element = new PointSpriteStringElement(content, position, color, fontSize, maxRowWidth, fontResource);
}
///// <summary>
///// 获取或设置此字符串的字体资源。
///// </summary>
//public FontResource Resource
//{
// get { return this.resouce; }
// set
// {
// if (value != this.resouce)
// {
// this.resouce = value;
// InitTexture(this.content, this.FontSize, this.resouce);
// }
// }
//}
//public void UpdateProperties(string content, GLColor color, int fontSize, FontResource fontResource)
//{
//}
/// <summary>
/// 用shader+VAO+组装的texture显示字符串
/// </summary>
/// <param name="content">要显示的字符串</param>
/// <param name="position">字符串的中心位置</param>
/// <param name="color">文字颜色，默认为黑色</param>
/// <param name="fontSize">字体大小，默认为32</param>
/// <param name="fontResource">字体资源。默认的字体资源只支持ASCII码。</param>
public PointSpriteStringElement(
string content, vec3 position,
GLColor color = null, int fontSize = 32, int maxRowWidth = 256, FontResource fontResource = null)
{
if (fontSize > 256) { throw new ArgumentException(); }
this.content = content;
this.position = position;
if (color == null)
{
textColor = new vec3(0, 0, 0);
}
else
{
textColor = new vec3(color.R, color.G, color.B);
}
this.fontSize = fontSize;
if (0 < maxRowWidth && maxRowWidth < 257)
{
this.maxRowWidth = maxRowWidth;
}
else
{
throw new ArgumentOutOfRangeException("max row width must between 0 and 257(not include 0 or 257)");
}
if (fontResource == null)
{
this.resource = FontResource.Default;
}
else
{
this.resource = fontResource;
}
}
/// <summary>
/// TODO: 这里生成的中间贴图太大，有优化的空间
/// </summary>
/// <param name="content"></param>
private void InitTexture(string content, int fontSize, int maxRowWidth, FontResource fontResource)
{
Bitmap contentBitmap = fontResource.GenerateBitmapForString(content, fontSize, maxRowWidth);
// get texture's size
int targetTextureWidth;
{
this.textureWidth = contentBitmap.Width;
targetTextureWidth = contentBitmap.Width;
}
// scale contentBitmap to right size
System.Drawing.Bitmap targetImage = contentBitmap;
if (contentBitmap.Width != targetTextureWidth || contentBitmap.Height != targetTextureWidth)
{
// Resize the image.
targetImage = (System.Drawing.Bitmap)contentBitmap.GetThumbnailImage(
targetTextureWidth, targetTextureWidth, null, IntPtr.Zero);
}
// generate texture
{
// Lock the image bits (so that we can pass them to OGL).
BitmapData bitmapData = targetImage.LockBits(
new Rectangle(0, 0, targetImage.Width, targetImage.Height),
ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
//GL.ActiveTexture(GL.GL_TEXTURE0);
GL.GenTextures(1, texture);
GL.BindTexture(GL.GL_TEXTURE_2D, texture[0]);
GL.TexImage2D(GL.GL_TEXTURE_2D, 0, (int)GL.GL_RGBA,
targetImage.Width, targetImage.Height, 0, GL.GL_BGRA, GL.GL_UNSIGNED_BYTE,
bitmapData.Scan0);
// Unlock the image.
targetImage.UnlockBits(bitmapData);
/* We require 1 byte alignment when uploading texture data */
//GL.PixelStorei(GL.GL_UNPACK_ALIGNMENT, 1);
/* Clamping to edges is important to prevent artifacts when scaling */
GL.TexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, (int)GL.GL_CLAMP_TO_EDGE);
GL.TexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, (int)GL.GL_CLAMP_TO_EDGE);
/* Linear filtering usually looks best for text */
GL.TexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, (int)GL.GL_LINEAR);
GL.TexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, (int)GL.GL_LINEAR);
}
// release images
{
//targetImage.Save("PointSpriteFontElement-TargetImage.png");
if (targetImage != contentBitmap)
{
targetImage.Dispose();
}
contentBitmap.Dispose();
}
}
// TODO: 这里生成的中间贴图太大，有优化的空间
/// <summary>
/// 为指定的字符串生成贴图。
/// </summary>
/// <param name="fontResource"></param>
/// <param name="content"></param>
/// <param name="fontSize"></param>
/// <param name="maxRowWidth"></param>
/// <returns></returns>
public static System.Drawing.Bitmap GenerateBitmapForString(this FontResource fontResource,
string content, int fontSize, int maxRowWidth)
{
//fontResource.FontBitmap.Save("FontBitmap.png");
// step 1: get totalLength
int totalLength = 0;
{
int glyphsLength = 0;
for (int i = 0; i < content.Length; i++)
{
char c = content[i];
CharacterInfo cInfo;
if (fontResource.CharInfoDict.TryGetValue(c, out cInfo))
{
int glyphWidth = cInfo.width;
glyphsLength += glyphWidth;
}
//else
//{ throw new Exception(string.Format("Not support for display the char [{0}]", c)); }
}
//glyphsLength = (glyphsLength * this.fontSize / FontResource.Instance.FontHeight);
int interval = fontResource.FontHeight / 10; if (interval < 1)
{
interval = 1;
}
totalLength = glyphsLength + interval * (content.Length - 1);
}
// step 2: setup contentBitmap
System.Drawing.Bitmap contentBitmap = null;
{
int interval = fontResource.FontHeight / 10; if (interval < 1)
{
interval = 1;
}
//int totalLength = glyphsLength + interval * (content.Length - 1);
int currentTextureWidth = 0;
int currentWidthPos = 0;
int currentHeightPos = 0;
if (totalLength * fontSize > maxRowWidth * fontResource.FontHeight)// 超过1行能显示的内容
{
currentTextureWidth = maxRowWidth * fontResource.FontHeight / fontSize;
int lineCount = (totalLength - 1) / currentTextureWidth + 1;
// 确保整篇文字的高度在贴图中间。
currentHeightPos = (currentTextureWidth - fontResource.FontHeight * lineCount) / 2;
//- FontResource.Instance.FontHeight / 2;
}
else//只在一行内即可显示所有字符
{
if (totalLength >= fontResource.FontHeight)
{
currentTextureWidth = totalLength;
// 确保整篇文字的高度在贴图中间。
currentHeightPos = (currentTextureWidth - fontResource.FontHeight) / 2;
//- FontResource.Instance.FontHeight / 2;
}
else
{
currentTextureWidth = fontResource.FontHeight;
currentWidthPos = (currentTextureWidth - totalLength) / 2;
//glyphsLength = fontResource.FontHeight;
}
}
//this.textureWidth = textureWidth * this.fontSize / FontResource.Instance.FontHeight;
//currentWidthPosition = currentWidthPosition * this.fontSize / FontResource.Instance.FontHeight;
//currentHeightPosition = currentHeightPosition * this.fontSize / FontResource.Instance.FontHeight;
contentBitmap = new Bitmap(currentTextureWidth, currentTextureWidth);
Graphics gContentBitmap = Graphics.FromImage(contentBitmap);
Bitmap bigBitmap = fontResource.FontBitmap;
for (int i = 0; i < content.Length; i++)
{
char c = content[i];
CharacterInfo cInfo;
if (fontResource.CharInfoDict.TryGetValue(c, out cInfo))
{
if (currentWidthPos + cInfo.width > contentBitmap.Width)
{
currentWidthPos = 0;
currentHeightPos += fontResource.FontHeight;
}
gContentBitmap.DrawImage(bigBitmap,
new Rectangle(currentWidthPos, currentHeightPos, cInfo.width, fontResource.FontHeight),
new Rectangle(cInfo.xoffset, cInfo.yoffset, cInfo.width, fontResource.FontHeight),
GraphicsUnit.Pixel);
currentWidthPos += cInfo.width + interval;
}
}
gContentBitmap.Dispose();
//contentBitmap.Save("PointSpriteStringElement-contentBitmap.png");
System.Drawing.Bitmap bmp = null;
if (totalLength * fontSize > maxRowWidth * fontResource.FontHeight)// 超过1行能显示的内容
{
bmp = (System.Drawing.Bitmap)contentBitmap.GetThumbnailImage(
maxRowWidth, maxRowWidth, null, IntPtr.Zero);
}
else//只在一行内即可显示所有字符
{
if (totalLength >= fontResource.FontHeight)
{
bmp = (System.Drawing.Bitmap)contentBitmap.GetThumbnailImage(
totalLength * fontSize / fontResource.FontHeight,
totalLength * fontSize / fontResource.FontHeight,
null, IntPtr.Zero);
}
else
{
bmp = (System.Drawing.Bitmap)contentBitmap.GetThumbnailImage(
fontSize, fontSize, null, IntPtr.Zero);
}
}
contentBitmap.Dispose();
contentBitmap = bmp;
//contentBitmap.Save("PointSpriteStringElement-contentBitmap-scaled.png");
}
return(contentBitmap);
}
