ft2-bitmap_handling.html

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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>FreeType-2.1.10 API Reference</title><style type="text/css">  body { font-family: Verdana, Geneva, Arial, Helvetica, serif;         color: #000000;         background: #FFFFFF; }  p { text-align: justify; }  h1 { text-align: center; }  li { text-align: justify; }  a:link { color: #0000EF; }  a:visited { color: #51188E; }  a:hover { color: #FF0000; }  span.keyword { font-family: monospace;                 text-align: left;                 white-space: pre;                 color: darkblue; }  pre.colored { color: blue; }  ul.empty { list-style-type: none; }</style></head><body><center><h1>FreeType-2.1.10 API Reference</h1></center><center><h1>Bitmap Handling</h1></center><h2>Synopsis</h2><table align=center cellspacing=5 cellpadding=0 border=0><tr><td></td><td><a href="#FT_Bitmap_New">FT_Bitmap_New</a></td><td></td><td><a href="#FT_Bitmap_Embolden">FT_Bitmap_Embolden</a></td><td></td><td><a href="#FT_Bitmap_Done">FT_Bitmap_Done</a></td></tr><tr><td></td><td><a href="#FT_Bitmap_Copy">FT_Bitmap_Copy</a></td><td></td><td><a href="#FT_Bitmap_Convert">FT_Bitmap_Convert</a></td><td></td><td></td></tr></table><br><br><table align=center width="87%"><tr><td><p>This section contains functions for converting FT_Bitmap objects.</p></td></tr></table><br><table align=center width="75%"><tr><td><h4><a name="FT_Bitmap_New">FT_Bitmap_New</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  FT_EXPORT( <span class="keyword">void</span> )  <b>FT_Bitmap_New</b>( <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>  *abitmap );</pre></table><br><table align=center width="87%"><tr><td><p>Initialize a pointer to an FT_Bitmap structure.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>inout</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>abitmap</b></td><td><p>A pointer to the bitmap structure.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Bitmap_Copy">FT_Bitmap_Copy</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  FT_EXPORT_DEF( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> )  <b>FT_Bitmap_Copy</b>( <a href="ft2-base_interface.html#FT_Library">FT_Library</a>        library,                  <span class="keyword">const</span> <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>  *source,                  <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>        *target);</pre></table><br><table align=center width="87%"><tr><td><p>Copies an bitmap into another one.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>library</b></td><td><p>A handle to a library object.</p></td></tr><tr valign=top><td><b>source</b></td><td><p>A handle to the source bitmap.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>target</b></td><td><p>A handle to the target bitmap.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Bitmap_Embolden">FT_Bitmap_Embolden</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  FT_EXPORT_DEF( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> )  <b>FT_Bitmap_Embolden</b>( <a href="ft2-base_interface.html#FT_Library">FT_Library</a>  library,                      <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>*  bitmap,                      <a href="ft2-basic_types.html#FT_Pos">FT_Pos</a>      xStrength,                      <a href="ft2-basic_types.html#FT_Pos">FT_Pos</a>      yStrength );</pre></table><br><table align=center width="87%"><tr><td><p>Embolden a bitmap. The new bitmap will be about `xStrength' pixels wider and `yStrength' pixels higher. The left and bottom borders are kept unchanged.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>library</b></td><td><p>A handle to a library object.</p></td></tr><tr valign=top><td><b>xStrength</b></td><td><p>How strong the glyph is emboldened horizontally. Expressed in 26.6 pixel format.</p></td></tr><tr valign=top><td><b>yStrength</b></td><td><p>How strong the glyph is emboldened vertically. Expressed in 26.6 pixel format.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>inout</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>bitmap</b></td><td><p>A handle to the target bitmap.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>The current implementation restricts `xStrength' to be less than or equal to 8 if bitmap is of pixel_mode <a href="ft2-basic_types.html#FT_Pixel_Mode">FT_PIXEL_MODE_MONO</a>.</p><p>Don't embolden the bitmap owned by a <a href="ft2-base_interface.html#FT_GlyphSlot">FT_GlyphSlot</a> directly! Call <a href="ft2-bitmap_handling.html#FT_Bitmap_Copy">FT_Bitmap_Copy</a> to get a copy and work on the copy instead.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Bitmap_Convert">FT_Bitmap_Convert</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> )  <b>FT_Bitmap_Convert</b>( <a href="ft2-base_interface.html#FT_Library">FT_Library</a>        library,                     <span class="keyword">const</span> <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>  *source,                     <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>        *target,                     <a href="ft2-basic_types.html#FT_Int">FT_Int</a>            alignment );</pre></table><br><table align=center width="87%"><tr><td><p>Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, or 8bpp to a bitmap object with depth 8bpp, making the number of used bytes per line (a.k.a. the `pitch') a multiple of `alignment'.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>library</b></td><td><p>A handle to a library object.</p></td></tr><tr valign=top><td><b>source</b></td><td><p>The source bitmap.</p></td></tr><tr valign=top><td><b>alignment</b></td><td><p>The pitch of the bitmap is a multiple of this parameter. Common values are 1, 2, or 4.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>target</b></td><td><p>The target bitmap.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>It is possible to call <a href="ft2-bitmap_handling.html#FT_Bitmap_Convert">FT_Bitmap_Convert</a> multiple times without calling <a href="ft2-bitmap_handling.html#FT_Bitmap_Done">FT_Bitmap_Done</a> (the memory is simply reallocated).</p><p>Use <a href="ft2-bitmap_handling.html#FT_Bitmap_Done">FT_Bitmap_Done</a> to finally remove the bitmap object.</p><p>The `library' argument is taken to have access to FreeType's memory handling functions.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Bitmap_Done">FT_Bitmap_Done</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>  FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> )  <b>FT_Bitmap_Done</b>( <a href="ft2-base_interface.html#FT_Library">FT_Library</a>  library,                  <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>  *bitmap );</pre></table><br><table align=center width="87%"><tr><td><p>Destroy a bitmap object created with <a href="ft2-bitmap_handling.html#FT_Bitmap_New">FT_Bitmap_New</a>.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>library</b></td><td><p>A handle to a library object.</p></td></tr><tr valign=top><td><b>bitmap</b></td><td><p>The bitmap object to be freed.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>The `library' argument is taken to have access to FreeType's memory handling functions.</p></td></tr></table></td></tr></table><hr width="75%"></body></html>

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