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Implemented MeasureCharacterRanges function using the new GdiPlus bindings.

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This commit is contained in:
the_fiddler 2008-06-22 16:29:13 +00:00
parent 0a8f1a9c6a
commit 314bec1c66
1 changed files with 113 additions and 9 deletions
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122
Source/Utilities/Fonts/TextureFont.cs
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@ -25,7 +25,7 @@ namespace OpenTK.Graphics
public class TextureFont : IFont
{
Font font;
Dictionary<char, Box2> loaded_glyphs = new Dictionary<char, Box2>(64);
Dictionary<char, RectangleF> loaded_glyphs = new Dictionary<char, RectangleF>(64);
Bitmap bmp;
Graphics gfx;
@ -80,7 +80,7 @@ namespace OpenTK.Graphics
/// <param name="glyphs">The glyphs to prepare for rendering.</param>
public void LoadGlyphs(string glyphs)
{
Box2 rect = new Box2();
RectangleF rect = new RectangleF();
foreach (char c in glyphs)
{
if (!loaded_glyphs.ContainsKey(c))
@ -98,14 +98,14 @@ namespace OpenTK.Graphics
/// <param name="glyphs">The glyph to prepare for rendering.</param>
public void LoadGlyph(char glyph)
{
Box2 rect = new Box2();
RectangleF rect = new RectangleF();
if (!loaded_glyphs.ContainsKey(glyph))
LoadGlyph(glyph, out rect);
}
#endregion
#region public bool GlyphData(char glyph, out float width, out float height, out Box2 textureRectangle, out int texture)
#region public bool GlyphData(char glyph, out float width, out float height, out RectangleF textureRectangle, out int texture)
/// <summary>
/// Returns the characteristics of a loaded glyph.
@ -117,7 +117,7 @@ namespace OpenTK.Graphics
/// <param name="texture">The handle to the texture that contains this glyph.</param>
/// <returns>True if the glyph has been loaded, false otherwise.</returns>
/// <seealso cref="LoadGlyphs"/>
public bool GlyphData(char glyph, out float width, out float height, out Box2 textureRectangle, out int texture)
public bool GlyphData(char glyph, out float width, out float height, out RectangleF textureRectangle, out int texture)
{
if (loaded_glyphs.TryGetValue(glyph, out textureRectangle))
{
@ -164,16 +164,27 @@ namespace OpenTK.Graphics
/// <param name="str">The string to measure.</param>
/// <param name="width">The measured width.</param>
/// <param name="height">The measured height.</param>
/// <param name="addSpace">If true, adds space to account for glyph overhangs. Set to true if you wish to measure a complete string. Set to false if you wish to perform layout on adjacent strings.</param>
/// <param name="accountForOverhangs">If true, adds space to account for glyph overhangs. Set to true if you wish to measure a complete string. Set to false if you wish to perform layout on adjacent strings.</param>
public void MeasureString(string str, out float width, out float height, bool accountForOverhangs)
{
System.Drawing.StringFormat format = accountForOverhangs ? System.Drawing.StringFormat.GenericDefault : System.Drawing.StringFormat.GenericTypographic;
format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
//format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
System.Drawing.SizeF size = gfx.MeasureString(str, font, 16384, format);
height = size.Height;
width = size.Width;
//width = height = 0;
//RectangleF rect = new RectangleF(0, 0, 0, 0);
//ICollection<RectangleF> ranges = new List<RectangleF>();
//MeasureCharacterRanges(gfx, str, font, ref rect, format, ref ranges);
//foreach (RectangleF range in ranges)
//{
// width += range.Width;
// height = range.Height > height ?range.Height : height;
//}
// width = 0;
// height = 0;
// int i = 0;
@ -208,10 +219,103 @@ namespace OpenTK.Graphics
#endregion
#region public void MeasureCharacterRanges(string text, ref ICollection<RectangleF> ranges)
/// <summary>
/// Measures the individual character positions for the specified string.
/// </summary>
/// <param name="text">The string to measure.</param>
/// <param name="ranges">An ICollection of RectangleF structures, containing the positions of individual characters.</param>
public void MeasureCharacterRanges(string text, ref ICollection<RectangleF> ranges)
{
MeasureCharacterRanges(text, false, ref ranges);
}
#endregion
#region public void MeasureCharacterRanges(string text, bool accountForOverhangs, ref ICollection<RectangleF> ranges)
/// <summary>
/// Measures the individual character positions for the specified string.
/// </summary>
/// <param name="text">The string to measure.</param>
/// <param name="accountForOverhangs">If true, adds space to account for glyph overhangs. Set to true if you wish to measure a complete string. Set to false if you wish to perform layout on adjacent strings.</param>
/// <param name="ranges">An ICollection of RectangleF structures, containing the positions of individual characters.</param>
public void MeasureCharacterRanges(string text, bool accountForOverhangs, ref ICollection<RectangleF> ranges)
{
System.Drawing.StringFormat format = accountForOverhangs ? System.Drawing.StringFormat.GenericDefault : System.Drawing.StringFormat.GenericTypographic;
RectangleF rect = new RectangleF(0, 0, gfx.ClipBounds.Width, gfx.ClipBounds.Height);
MeasureCharacterRanges(text, ref rect, format, ref ranges);
}
#endregion
#endregion
#region --- Private Methods ---
#region void MeasureCharacterRanges(string text, ref RectangleF layoutRect, StringFormat format, ref ICollection<RectangleF> ranges)
void MeasureCharacterRanges(string text, ref RectangleF layoutRect, StringFormat format, ref ICollection<RectangleF> ranges)
{
ranges.Clear(); // Hopefully this doesn't trim the collection.
//GPRECTF rect = new GPRECTF(layoutRect);
//rect = new GPRECTF(0, 0, 256, 256);
int status = 0;
if (String.IsNullOrEmpty(text))
return;
if (font == null) throw new ArgumentNullException("font");
if (format == null) throw new ArgumentNullException("format");
IntPtr[] regions = new IntPtr[GdiPlus.MaxMeasurableCharacterRanges];
CharacterRange[] characterRanges = new CharacterRange[GdiPlus.MaxMeasurableCharacterRanges];
for (int i = 0; i < text.Length; i += GdiPlus.MaxMeasurableCharacterRanges)
{
int num_characters = text.Length - i > GdiPlus.MaxMeasurableCharacterRanges ? GdiPlus.MaxMeasurableCharacterRanges : text.Length - i;
for (int j = 0; j < num_characters; j++)
{
characterRanges[j] = new CharacterRange(i + j, 1);
IntPtr region;
status = GdiPlus.CreateRegion(out region);
regions[j] = region;
if (status != 0)
Debug.Print("GDI+ error: {0}", status);
}
CharacterRange[] a = (CharacterRange[])characterRanges.Clone();
Array.Resize(ref a, num_characters);
format.SetMeasurableCharacterRanges(a);
IntPtr native_graphics = GdiPlus.GetNativeGraphics(gfx);
IntPtr native_font = GdiPlus.GetNativeFont(font);
IntPtr native_string_format = GdiPlus.GetNativeStringFormat(format);
status = GdiPlus.MeasureCharacterRanges(new HandleRef(gfx, native_graphics), text, text.Length,
new HandleRef(font, native_font), ref layoutRect,
new HandleRef(format, (format == null) ? IntPtr.Zero : native_string_format),
num_characters, regions);
for (int j = 0; j < num_characters; j++)
{
RectangleF rect = new RectangleF();
status = GdiPlus.GetRegionBounds(regions[j], new HandleRef(gfx, GdiPlus.GetNativeGraphics(gfx)), ref rect);
ranges.Add(rect);
status = GdiPlus.DeleteRegion(regions[j]);
}
}
}
#endregion
#region private void PrepareTexturePacker()
/// <summary>
@ -250,7 +354,7 @@ namespace OpenTK.Graphics
/// </summary>
/// <param name="c">The character of the glyph.</param>
/// <param name="rectangle">An OpenTK.Math.Box2 that will hold the buffer for this glyph.</param>
private void LoadGlyph(char c, out Box2 rectangle)
private void LoadGlyph(char c, out RectangleF rectangle)
{
if (pack == null)
PrepareTexturePacker();
@ -299,7 +403,7 @@ namespace OpenTK.Graphics
}
bmp.UnlockBits(bitmap_data);
rectangle = new Box2(
rectangle = RectangleF.FromLTRB(
rect.Left / (float)texture_width,
rect.Top / (float)texture_height,
rect.Right / (float)texture_width,