ImageMagick: MagickCore, C API for ImageMagick: Annotate an Image
Author: ImageMagick Studio LLC
Description: ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.
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AnnotateImage • FormatMagickCaption • GetMultilineTypeMetrics • GetTypeMetrics

## AnnotateImage

AnnotateImage() annotates an image with text. Optionally you can include any of the following bits of information about the image by embedding the appropriate special characters:

        \n   newline
        \r   carriage return
        <    less-than character.
        >    greater-than character.
        &    ampersand character.
     a percent sign
        b   file size of image read in
        c   comment meta-data property
        d   directory component of path
        e   filename extension or suffix
        f   filename (including suffix)
        g   layer canvas page geometry   (equivalent to "WxHXY")
        h   current image height in pixels
        i   image filename (note: becomes output filename for "info:")
        k   CALCULATED: number of unique colors
        l   label meta-data property
        m   image file format (file magic)
        n   number of images in current image sequence
        o   output filename  (used for delegates)
        p   index of image in current image list
        q   quantum depth (compile-time constant)
        r   image class and colorspace
        s   scene number (from input unless re-assigned)
        t   filename without directory or extension (suffix)
        u   unique temporary filename (used for delegates)
        w   current width in pixels
        x   x resolution (density)
        y   y resolution (density)
        z   image depth (as read in unless modified, image save depth)
        A   image transparency channel enabled (true/false)
        C   image compression type
        D   image GIF dispose method
        G   original image size (wxh; before any resizes)
        H   page (canvas) height
        M   Magick filename (original file exactly as given,  including read mods)
        O   page (canvas) offset ( = XY )
        P   page (canvas) size ( = WxH )
        Q   image compression quality ( 0 = default )
        S   ?? scenes ??
        T   image time delay (in centi-seconds)
        U   image resolution units
        W   page (canvas) width
        X   page (canvas) x offset (including sign)
        Y   page (canvas) y offset (including sign)
        Z   unique filename (used for delegates)
        @   CALCULATED: trim bounding box (without actually trimming)
        #   CALCULATED: 'signature' hash of image values

The format of the AnnotateImage method is:

    MagickBooleanType AnnotateImage(Image *image,DrawInfo *draw_info)

A description of each parameter follows:

image
  the image.
draw_info
  the draw info.

## FormatMagickCaption

FormatMagickCaption() formats a caption so that it fits within the image width. It returns the number of lines in the formatted caption.

The format of the FormatMagickCaption method is:

    ssize_t FormatMagickCaption(Image *image,DrawInfo *draw_info,
      const MagickBooleanType split,TypeMetric *metrics,char **caption)

A description of each parameter follows.

image

The image.

draw_info

the draw info.

split

when no convenient line breaks-- insert newline.

metrics

Return the font metrics in this structure.

caption

the caption.

## GetMultilineTypeMetrics

GetMultilineTypeMetrics() returns the following information for the specified font and text:

        character width
        character height
        ascender
        descender
        text width
        text height
        maximum horizontal advance
        bounds: x1
        bounds: y1
        bounds: x2
        bounds: y2
        origin: x
        origin: y
        underline position
        underline thickness

This method is like GetTypeMetrics() but it returns the maximum text width and height for multiple lines of text.

The format of the GetMultilineTypeMetrics method is:

    MagickBooleanType GetMultilineTypeMetrics(Image *image,
      const DrawInfo *draw_info,TypeMetric *metrics)

A description of each parameter follows:

image
  the image.
draw_info
  the draw info.
metrics
  Return the font metrics in this structure.

## GetTypeMetrics

GetTypeMetrics() returns the following information for the specified font and text:

        character width
        character height
        ascender
        descender
        text width
        text height
        maximum horizontal advance
        bounds: x1
        bounds: y1
        bounds: x2
        bounds: y2
        origin: x
        origin: y
        underline position
        underline thickness

The format of the GetTypeMetrics method is:

    MagickBooleanType GetTypeMetrics(Image *image,const DrawInfo *draw_info,
      TypeMetric *metrics)

A description of each parameter follows:

image
  the image.
draw_info
  the draw info.
metrics
  Return the font metrics in this structure.