Java 类com.badlogic.gdx.graphics.g2d.freetype.FreeType.SizeMetrics 实例源码

static UnderlineMetrics deriveUnderlineMetrics(FreeTypeFontGenerator generator, int size) {
    try {
        // Size metrics aren't publicly accessible (as of 1.9.3). (Ab)use reflection to gain access.
        Field faceField = FreeTypeFontGenerator.class.getDeclaredField("face");
        faceField.setAccessible(true);
        Face face = (Face)faceField.get(generator);

        SizeMetrics sizeMetrics = face.getSize().getMetrics();

        int yScale = sizeMetrics.getYscale(); // 16.16 fixed point
        float position = FreeType.toInt(face.getUnderlinePosition() * yScale >> 16);
        float thickness = FreeType.toInt(face.getUnderlineThickness() * yScale >> 16);
        return new UnderlineMetrics(position, thickness);
    } catch (Exception e) {
        LOG.error("Error fetching FreeType underline metrics", e);
    }

    // Return a reasonable default
    return UnderlineMetrics.defaultInstance(size);
}

/** Uses ascender and descender of font to calculate real height that makes all glyphs to fit in given pixel size. Source:
 * http://nothings.org/stb/stb_truetype.h / stbtt_ScaleForPixelHeight */
public int scaleForPixelHeight (int height) {
    setPixelSizes(0, height);
    SizeMetrics fontMetrics = face.getSize().getMetrics();
    int ascent = FreeType.toInt(fontMetrics.getAscender());
    int descent = FreeType.toInt(fontMetrics.getDescender());
    return height * height / (ascent - descent);
}

/** Uses max advance, ascender and descender of font to calculate real height that makes any n glyphs to fit in given pixel
 * width.
 * @param width the max width to fit (in pixels)
 * @param numChars max number of characters that to fill width */
public int scaleForPixelWidth (int width, int numChars) {
    SizeMetrics fontMetrics = face.getSize().getMetrics();
    int advance = FreeType.toInt(fontMetrics.getMaxAdvance());
    int ascent = FreeType.toInt(fontMetrics.getAscender());
    int descent = FreeType.toInt(fontMetrics.getDescender());
    int unscaledHeight = ascent - descent;
    int height = unscaledHeight * width / (advance * numChars);
    setPixelSizes(0, height);
    return height;
}

/** Uses ascender and descender of font to calculate real height that makes all glyphs to fit in given pixel size. Source:
 * http://nothings.org/stb/stb_truetype.h / stbtt_ScaleForPixelHeight */
public int scaleForPixelHeight (int height) {
    if (!bitmapped && !FreeType.setPixelSizes(face, 0, height)) throw new GdxRuntimeException("Couldn't set size for font");
    SizeMetrics fontMetrics = face.getSize().getMetrics();
    int ascent = FreeType.toInt(fontMetrics.getAscender());
    int descent = FreeType.toInt(fontMetrics.getDescender());
    return height * height / (ascent - descent);
}

/** Uses max advance, ascender and descender of font to calculate real height that makes any n glyphs to fit in given pixel width. 
 * @param width the max width to fit (in pixels)
 * @param numChars max number of characters that to fill width */
public int scaleForPixelWidth(int width, int numChars) {
    SizeMetrics fontMetrics = face.getSize().getMetrics();
    int advance = FreeType.toInt(fontMetrics.getMaxAdvance());
    int ascent = FreeType.toInt(fontMetrics.getAscender());
    int descent = FreeType.toInt(fontMetrics.getDescender());
    int unscaledHeight = ascent - descent;
    int height = unscaledHeight * width / (advance * numChars);
    if (!bitmapped && !FreeType.setPixelSizes(face, 0, height)) throw new GdxRuntimeException("Couldn't set size for font");
    return height;
}

/** Returns null if glyph was not found. If there is nothing to render, for example with various space characters, then bitmap
 * is null. */
public GlyphAndBitmap generateGlyphAndBitmap (int c, int size, boolean flip) {
    setPixelSizes(0, size);

    SizeMetrics fontMetrics = face.getSize().getMetrics();
    int baseline = FreeType.toInt(fontMetrics.getAscender());

    // Check if character exists in this font.
    // 0 means 'undefined character code'
    if (face.getCharIndex(c) == 0) {
        return null;
    }

    // Try to load character
    if (!loadChar(c)) {
        throw new GdxRuntimeException("Unable to load character!");
    }

    GlyphSlot slot = face.getGlyph();

    // Try to render to bitmap
    Bitmap bitmap;
    if (bitmapped) {
        bitmap = slot.getBitmap();
    } else if (!slot.renderGlyph(FreeType.FT_RENDER_MODE_NORMAL)) {
        bitmap = null;
    } else {
        bitmap = slot.getBitmap();
    }

    GlyphMetrics metrics = slot.getMetrics();

    Glyph glyph = new Glyph();
    if (bitmap != null) {
        glyph.width = bitmap.getWidth();
        glyph.height = bitmap.getRows();
    } else {
        glyph.width = 0;
        glyph.height = 0;
    }
    glyph.xoffset = slot.getBitmapLeft();
    glyph.yoffset = flip ? -slot.getBitmapTop() + baseline : -(glyph.height - slot.getBitmapTop()) - baseline;
    glyph.xadvance = FreeType.toInt(metrics.getHoriAdvance());
    glyph.srcX = 0;
    glyph.srcY = 0;
    glyph.id = c;

    GlyphAndBitmap result = new GlyphAndBitmap();
    result.glyph = glyph;
    result.bitmap = bitmap;
    return result;
}

/** Returns null if glyph was not found. If there is nothing to render, for example with various space characters, then bitmap
 * is null. */
public GlyphAndBitmap generateGlyphAndBitmap (int c, int size, boolean flip) {
    if (!bitmapped && !FreeType.setPixelSizes(face, 0, size)) throw new GdxRuntimeException("Couldn't set size for font");

    SizeMetrics fontMetrics = face.getSize().getMetrics();
    int baseline = FreeType.toInt(fontMetrics.getAscender());

    // Check if character exists in this font.
    // 0 means 'undefined character code'
    if (FreeType.getCharIndex(face, c) == 0) {
        return null;
    }

    // Try to load character
    if (!FreeType.loadChar(face, c, FreeType.FT_LOAD_DEFAULT)) {
        throw new GdxRuntimeException("Unable to load character!");
    }

    GlyphSlot slot = face.getGlyph();

    // Try to render to bitmap
    Bitmap bitmap;
    if (bitmapped) {
        bitmap = slot.getBitmap();
    } else if (!FreeType.renderGlyph(slot, FreeType.FT_RENDER_MODE_LIGHT)) {
        bitmap = null;
    } else {
        bitmap = slot.getBitmap();
    }

    GlyphMetrics metrics = slot.getMetrics();

    Glyph glyph = new Glyph();
    if (bitmap != null) {
        glyph.width = bitmap.getWidth();
        glyph.height = bitmap.getRows();
    } else {
        glyph.width = 0;
        glyph.height = 0;
    }
    glyph.xoffset = slot.getBitmapLeft();
    glyph.yoffset = flip ? -slot.getBitmapTop() + baseline : -(glyph.height - slot.getBitmapTop()) - baseline;
    glyph.xadvance = FreeType.toInt(metrics.getHoriAdvance());
    glyph.srcX = 0;
    glyph.srcY = 0;
    glyph.id = c;

    GlyphAndBitmap result = new GlyphAndBitmap();
    result.glyph = glyph;
    result.bitmap = bitmap;
    return result;
}