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This field is negative for values below the baseline. The second parameter is a standard render mode to specify what kind of bitmap we want. create face object ... ... Each charmap has a few visible fields to describe it more precisely.

FT_GlyphSlot slot = face->glyph; /* a small shortcut */ FT_UInt glyph_index; int pen_x, pen_y, n; ... But, in here, it is difficult to decide "the glyph description is not rendered correctly, and the metric should not be used" or "the glyph description is not rendered correctly, but Note that you can also specify that you want a monochrome bitmap instead by using the additional FT_LOAD_MONOCHROME load flag. left Just like the bitmap_left field of a glyph slot, this is the horizontal distance from the glyph origin (0,0) to the leftmost pixel of the glyph bitmap.

Each face object has a single glyph slot object that can be accessed as face->glyph. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the egg index. Note that bitmap_left is the horizontal distance from the current pen position to the leftmost border of the glyph bitmap, while bitmap_top is the vertical distance from the pen position (on height This is the height of the glyph image's bounding box.

The kerning mode is very similar to the bbox mode described in a previous section. It is sort of > out of the blue, as I have been using pretty much the same code to render > text for a very long time now. The new glyph object always contains a bitmap (if no error is returned), and you must typecast its handle to the FT_BitmapGlyph type in order to access its content. d.

The first image displays horizontal metrics, where the baseline is the horizontal axis. This means you have to destroy them yourself instead of relying on FT_Done_FreeType doing all the clean-up. Thanks a lot! Value of0 for the character width means ‘same as character height’, value of0 for the character height means ‘same as character width’.

Compiling the attached example4.cpp and comparing ./example4 /windows/C/WINDOWS/Fonts/pala.ttf y 200 0 (image `not-direct.png') with ./example4 /windows/C/WINDOWS/Fonts/pala.ttf y 200 1 (image `direct.png') you can easily see rendering differences. Load the glyph image in the normal way into the face's glyph slot. Its parameters are as follows. the font file could be opened and read, but it appears         //...

Note also that pen_x contains the total advance for the string of text. Last update: 8-Dec-2015 Home News Overview Documentation Development Contact FreeType Tutorial Simple Glyph Loading Managing Glyphs Examples FreeType Tutorial/II II. Among others, your new library object is able to handle TrueType, Type1, CID-keyed & OpenType/CFF fonts gracefully. If false, the original glyph object is never destroyed, even if its handle is lost (it is up to client applications to keep it).

error = FT_Load_Glyph( face, /* handle to face object */ glyph_index, /* glyph index */ load_flags ); /* load flags, see below */ The load_flags value is a set of bit ft-matrix-xy-set! units_per_EM This field is only valid for scalable formats (it is set to0 otherwise). pen_x = 0; /* start at (0,0) */ pen_y = 0; num_glyphs = 0; use_kerning = FT_HAS_KERNING( face ); previous = 0; glyph = glyphs; for ( n = 0; n

A face describes a given typeface and style. The resolution is used to compute the character pixel size from the character point size. Measuring the Glyph Image You can also retrieve the control (bounding) box of any glyph image (scalable or not) through the FT_Glyph_Get_CBox function. It is used for several reasons.

The first argument is a handle to a face object, not a size object. This section describes how design coordinates are scaled to the device space, and how to read glyph outlines and metrics in font units. You should do that using the macro FT_FREETYPE_H, like in the following example. #include #include FT_FREETYPE_H FT_FREETYPE_H is a special macro defined in file ftheader.h. It can be used to quickly compute the maximum advance width of a string of text.

However, you need to check that the font face's format is scalable before using them. We set the transformation on each glyph to indicate the rotation matrix as well as a delta that moves the transformed image to the current pen position (in cartesian space, not Its fields are explained by the FT_GlyphSlotRec structure documentation. FT_GlyphSlot slot = face->glyph; /* a small shortcut */ FT_UInt glyph_index; FT_Bool use_kerning; FT_UInt previous; int pen_x, pen_y, n; TGlyph glyphs[MAX_GLYPHS]; /* glyphs table */ PGlyph glyph; /* current glyph in

Notice that the values of the ascender and the descender are not reliable (due to various discrepancies in font formats), unfortunately. b. More values are available for the FT_Render_Mode enumeration value. Note that, generally speaking, these are not the cell size of the bitmap strikes. 5.

Glyph Metrics Glyph metrics are, as the name suggests, certain distances associated with each glyph that describe how to position this glyph while creating a text layout. Scalable formats like TrueType or CFF use vectorial shapes (outlines) to describe each glyph. The currently selected charmap can be accessed via face->charmap. face_index Certain font formats allow several font faces to be embedded in a single file.

The pen position is expressed in the Cartesian space (i.e., yupwards).