Esempio n. 1
0
        /// <summary><para>
        /// Embolden an outline. The new outline will be at most 4 times ‘strength’ pixels wider and higher. You may
        /// think of the left and bottom borders as unchanged.
        /// </para><para>
        /// Negative ‘strength’ values to reduce the outline thickness are possible also.
        /// </para></summary>
        /// <remarks><para>
        /// The used algorithm to increase or decrease the thickness of the glyph doesn't change the number of points;
        /// this means that certain situations like acute angles or intersections are sometimes handled incorrectly.
        /// </para><para>
        /// If you need ‘better’ metrics values you should call <see cref="GetCBox"/> or <see cref="GetBBox"/>.
        /// </para></remarks>
        /// <example>
        /// FT_Load_Glyph( face, index, FT_LOAD_DEFAULT );
        /// if ( face-&gt;slot-&gt;format == FT_GLYPH_FORMAT_OUTLINE )
        ///     FT_Outline_Embolden( &amp;face-&gt;slot-&gt;outline, strength );
        /// </example>
        /// <param name="strength">How strong the glyph is emboldened. Expressed in 26.6 pixel format.</param>
        public void Embolden(Fixed26Dot6 strength)
        {
            Error err = FT.FT_Outline_Embolden(Reference, (IntPtr)strength.Value);

            if (err != Error.Ok)
            {
                throw new FreeTypeException(err);
            }
        }
Esempio n. 2
0
        /// <summary><para>
        /// Embolden an outline. The new outline will be at most 4 times ‘strength’ pixels wider and higher. You may
        /// think of the left and bottom borders as unchanged.
        /// </para><para>
        /// Negative ‘strength’ values to reduce the outline thickness are possible also.
        /// </para></summary>
        /// <remarks><para>
        /// The used algorithm to increase or decrease the thickness of the glyph doesn't change the number of points;
        /// this means that certain situations like acute angles or intersections are sometimes handled incorrectly.
        /// </para><para>
        /// If you need ‘better’ metrics values you should call <see cref="GetCBox"/> or <see cref="GetBBox"/>.
        /// </para></remarks>
        /// <example>
        /// FT_Load_Glyph( face, index, FT_LOAD_DEFAULT );
        /// if ( face-&gt;slot-&gt;format == FT_GLYPH_FORMAT_OUTLINE )
        ///     FT_Outline_Embolden( &amp;face-&gt;slot-&gt;outline, strength );
        /// </example>
        /// <param name="strength">How strong the glyph is emboldened. Expressed in 26.6 pixel format.</param>
        public void Embolden(Fixed26Dot6 strength)
        {
            if (disposed)
            {
                throw new ObjectDisposedException("Outline", "Cannot access a disposed object.");
            }

            Error err = FT.FT_Outline_Embolden(reference, (IntPtr)strength.Value);

            if (err != Error.Ok)
            {
                throw new FreeTypeException(err);
            }
        }
Esempio n. 3
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        /// <summary>
        /// Embolden a bitmap. The new bitmap will be about ‘xStrength’ pixels wider and ‘yStrength’ pixels higher. The
        /// left and bottom borders are kept unchanged.
        /// </summary>
        /// <remarks><para>
        /// The current implementation restricts ‘xStrength’ to be less than or equal to 8 if bitmap is of pixel_mode
        /// <see cref="SharpFont.PixelMode.Mono"/>.
        /// </para><para>
        /// If you want to embolden the bitmap owned by a <see cref="GlyphSlot"/>, you should call
        /// <see cref="GlyphSlot.OwnBitmap"/> on the slot first.
        /// </para></remarks>
        /// <param name="library">A handle to a library object.</param>
        /// <param name="xStrength">
        /// How strong the glyph is emboldened horizontally. Expressed in 26.6 pixel format.
        /// </param>
        /// <param name="yStrength">
        /// How strong the glyph is emboldened vertically. Expressed in 26.6 pixel format.
        /// </param>
        public void Embolden(Library library, Fixed26Dot6 xStrength, Fixed26Dot6 yStrength)
        {
            if (library == null)
            {
                throw new ArgumentNullException("library");
            }

            Error err = FT.FT_Bitmap_Embolden(library.Reference, Reference, (IntPtr)xStrength.Value, (IntPtr)yStrength.Value);

            if (err != Error.Ok)
            {
                throw new FreeTypeException(err);
            }
        }
Esempio n. 4
0
        /// <summary>
        /// Embolden a bitmap. The new bitmap will be about ‘xStrength’ pixels wider and ‘yStrength’ pixels higher. The
        /// left and bottom borders are kept unchanged.
        /// </summary>
        /// <remarks><para>
        /// The current implementation restricts ‘xStrength’ to be less than or equal to 8 if bitmap is of pixel_mode
        /// <see cref="SharpFont.PixelMode.Mono"/>.
        /// </para><para>
        /// If you want to embolden the bitmap owned by a <see cref="GlyphSlot"/>, you should call
        /// <see cref="GlyphSlot.OwnBitmap"/> on the slot first.
        /// </para></remarks>
        /// <param name="library">A handle to a library object.</param>
        /// <param name="xStrength">
        /// How strong the glyph is emboldened horizontally. Expressed in 26.6 pixel format.
        /// </param>
        /// <param name="yStrength">
        /// How strong the glyph is emboldened vertically. Expressed in 26.6 pixel format.
        /// </param>
        public void Embolden(Library library, Fixed26Dot6 xStrength, Fixed26Dot6 yStrength)
        {
            if (disposed)
            {
                throw new ObjectDisposedException("FTBitmap", "Cannot access a disposed object.");
            }

            if (library == null)
            {
                throw new ArgumentNullException("library");
            }

            Error err = FT.FT_Bitmap_Embolden(library.Reference, Reference, (IntPtr)xStrength.Value, (IntPtr)yStrength.Value);

            if (err != Error.Ok)
            {
                throw new FreeTypeException(err);
            }
        }
Esempio n. 5
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 /// <summary>
 /// Initializes a new instance of the <see cref="FTVector26Dot6"/> struct.
 /// </summary>
 /// <param name="x">The horizontal coordinate.</param>
 /// <param name="y">The vertical coordinate.</param>
 public FTVector26Dot6(Fixed26Dot6 x, Fixed26Dot6 y)
     : this()
 {
     this.x = (IntPtr)x.Value;
     this.y = (IntPtr)y.Value;
 }
Esempio n. 6
0
        private Glyph LoadGlyph(int codePoint, int characterSize, bool bold, float outlineThickness)
        {
            Glyph glyph = new Glyph();

            if (_face == null)
            {
                return(null);
            }

            // Set the character size
            if (!SetCurrentSize(characterSize))
            {
                return(glyph);
            }

            // Load the glyph corresponding to the code point
            var flags = LoadFlags.ForceAutohint;

            if (outlineThickness != 0)
            {
                flags |= LoadFlags.NoBitmap;
            }

            _face.LoadChar((uint)codePoint, flags, SharpFont.LoadTarget.Normal);

            // Retrieve the glyph
            SharpFont.Glyph glyphDesc = _face.Glyph.GetGlyph();

            // Apply bold if necessary -- first technique using outline (highest quality)
            SharpFont.Fixed26Dot6 weight = new SharpFont.Fixed26Dot6(1);
            bool outline = glyphDesc.Format == SharpFont.GlyphFormat.Outline;

            if (outline)
            {
                if (bold)
                {
                    SharpFont.OutlineGlyph outlineGlyph = glyphDesc.ToOutlineGlyph();
                    outlineGlyph.Outline.Embolden(weight);
                }

                if (outlineThickness != 0)
                {
                    _stroker.Set((int)(outlineThickness * Fixed26Dot6.FromInt32(1).Value),
                                 StrokerLineCap.Round, StrokerLineJoin.Round, Fixed16Dot16.FromSingle(0));

                    // This function returning a new instance of Glyph
                    // Because the pointer may changed upon applying stroke to the glyph
                    glyphDesc = glyphDesc.Stroke(_stroker, false);
                }
            }

            // Convert the glyph to a bitmap (i.e. rasterize it)
            glyphDesc.ToBitmap(SharpFont.RenderMode.Normal, new FTVector26Dot6(0, 0), true);
            SharpFont.FTBitmap bitmap = glyphDesc.ToBitmapGlyph().Bitmap;

            // Apply bold if necessary -- fallback technique using bitmap (lower quality)
            if (!outline)
            {
                if (bold)
                {
                    bitmap.Embolden(_library, weight, weight);
                }

                if (outlineThickness != 0)
                {
                    Logger.Warning("Failed to outline glyph (no fallback available)");
                }
            }

            // Compute the glyph's advance offset
            glyph.Advance = _face.Glyph.Metrics.HorizontalAdvance.ToSingle();
            if (bold)
            {
                glyph.Advance += weight.ToSingle();
            }

            int width  = bitmap.Width;
            int height = bitmap.Rows;

            if ((width > 0) && (height > 0))
            {
                // Leave a small padding around characters, so that filtering doesn't
                // pollute them with pixels from neighbors
                int padding = 1;

                // Get the glyphs page corresponding to the character size
                Page page = _pages[characterSize];

                // Find a good position for the new glyph into the texture
                glyph.TexCoords = FindGlyphRectangle(page, width + 2 * padding, height + 2 * padding);
                var texRect = glyph.TexCoords;

                // Make sure the texture data is positioned in the center
                // of the allocated texture rectangle
                glyph.TexCoords = new Rectangle(texRect.X + padding, texRect.Y + padding,
                                                texRect.Width - 2 * padding, texRect.Height - 2 * padding);

                // Compute the glyph's bounding box
                float boundsX      = (float)(_face.Glyph.Metrics.HorizontalBearingX);
                float boundsY      = -(float)(_face.Glyph.Metrics.HorizontalBearingY);
                float boundsWidth  = (float)(_face.Glyph.Metrics.Width) + outlineThickness * 2;
                float boundsHeight = (float)(_face.Glyph.Metrics.Height) + outlineThickness * 2;
                glyph.Bounds = new RectangleF(boundsX, boundsY, boundsWidth, boundsHeight);

                // Extract the glyph's pixels from the bitmap
                byte[] pixelBuffer = new byte[width * height * 4];
                for (int i = 0; i < pixelBuffer.Length; i++)
                {
                    pixelBuffer[i] = 255;
                }

                unsafe
                {
                    byte *pixels = (byte *)bitmap.Buffer.ToPointer();
                    if (bitmap.PixelMode == SharpFont.PixelMode.Mono)
                    {
                        // Pixels are 1 bit monochrome values
                        for (int y = 0; y < height; ++y)
                        {
                            for (int x = 0; x < width; ++x)
                            {
                                // The color channels remain white, just fill the alpha channel
                                int index = (x + y * width) * 4 + 3;
                                pixelBuffer[index] = (byte)((((pixels[x / 8]) & (1 << (7 - (x % 8)))) > 0) ? 255 : 0);
                            }
                            pixels += bitmap.Pitch;
                        }
                    }
                    else
                    {
                        // Pixels are 8 bits gray levels
                        for (int y = 0; y < height; ++y)
                        {
                            for (int x = 0; x < width; ++x)
                            {
                                // The color channels remain white, just fill the alpha channel
                                int index = (x + y * width) * 4 + 3;
                                pixelBuffer[index] = pixels[x];
                            }
                            pixels += bitmap.Pitch;
                        }
                    }
                }

                // Write the pixels to the texture
                int tx = glyph.TexCoords.Left;
                int ty = glyph.TexCoords.Top;
                int tw = glyph.TexCoords.Width;
                int th = glyph.TexCoords.Height;
                page.texture.Update(pixelBuffer, tx, ty, tw, th);
            }

            // Delete the FT glyph
            glyphDesc.Dispose();

            return(glyph);
        }