ft2-sizes_management.html
来自「嵌入式freetype库的应用文档包含freetype的简要说明和应用examp」· HTML 代码 · 共 130 行
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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>Size Management</h1></center><h2>Synopsis</h2><table align=center cellspacing=5 cellpadding=0 border=0><tr><td></td><td><a href="#FT_New_Size">FT_New_Size</a></td><td></td><td><a href="#FT_Done_Size">FT_Done_Size</a></td><td></td><td><a href="#FT_Activate_Size">FT_Activate_Size</a></td><td></td><td></td></tr></table><br><br><table align=center width="87%"><tr><td><p>When creating a new face object (e.g. with <a href="ft2-base_interface.html#FT_New_Face">FT_New_Face</a>), an <a href="ft2-base_interface.html#FT_Size">FT_Size</a> object is automatically created and used to store all pixel-size dependent information, available in the "face->size" field.</p><p>It is however possible to create more sizes for a given face, mostly in order to manage several character pixel sizes of the same font family and style. See <a href="ft2-sizes_management.html#FT_New_Size">FT_New_Size</a> and <a href="ft2-sizes_management.html#FT_Done_Size">FT_Done_Size</a>.</p><p>Note that <a href="ft2-base_interface.html#FT_Set_Pixel_Sizes">FT_Set_Pixel_Sizes</a> and <a href="ft2-base_interface.html#FT_Set_Char_Size">FT_Set_Char_Size</a> only modify the contents of the current "active" size; you thus need to use <a href="ft2-sizes_management.html#FT_Activate_Size">FT_Activate_Size</a> to change it.</p><p>99% of applications won't need the functions provided here, especially if they use the caching sub-system, so be cautious when using these.</p></td></tr></table><br><table align=center width="75%"><tr><td><h4><a name="FT_New_Size">FT_New_Size</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_New_Size</b>( <a href="ft2-base_interface.html#FT_Face">FT_Face</a> face, <a href="ft2-base_interface.html#FT_Size">FT_Size</a>* size );</pre></table><br><table align=center width="87%"><tr><td><p>Creates a new size object from a given face object.</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>face</b></td><td><p>A handle to a parent face object.</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>asize</b></td><td><p>A handle to a new size object.</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>You need to call <a href="ft2-sizes_management.html#FT_Activate_Size">FT_Activate_Size</a> in order to select the new size for upcoming calls to <a href="ft2-base_interface.html#FT_Set_Pixel_Sizes">FT_Set_Pixel_Sizes</a>, <a href="ft2-base_interface.html#FT_Set_Char_Size">FT_Set_Char_Size</a>, <a href="ft2-base_interface.html#FT_Load_Glyph">FT_Load_Glyph</a>, <a href="ft2-base_interface.html#FT_Load_Char">FT_Load_Char</a>, etc.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Done_Size">FT_Done_Size</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_Done_Size</b>( <a href="ft2-base_interface.html#FT_Size">FT_Size</a> size );</pre></table><br><table align=center width="87%"><tr><td><p>Discards a given size object. Note that <a href="ft2-base_interface.html#FT_Done_Face">FT_Done_Face</a> automatically discards all size objects allocated with <a href="ft2-sizes_management.html#FT_New_Size">FT_New_Size</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>size</b></td><td><p>A handle to a target size object.</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_Activate_Size">FT_Activate_Size</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_Activate_Size</b>( <a href="ft2-base_interface.html#FT_Size">FT_Size</a> size );</pre></table><br><table align=center width="87%"><tr><td><p>Even though it is possible to create several size objects for a given face (see <a href="ft2-sizes_management.html#FT_New_Size">FT_New_Size</a> for details), functions like <a href="ft2-base_interface.html#FT_Load_Glyph">FT_Load_Glyph</a> or <a href="ft2-base_interface.html#FT_Load_Char">FT_Load_Char</a> only use the last-created one to determine the "current character pixel size".</p><p>This function can be used to "activate" a previously created size object.</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>size</b></td><td><p>A handle to a target size object.</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>If "face" is the size's parent face object, this function changes the value of "face->size" to the input size handle.</p></td></tr></table></td></tr></table><hr width="75%"></body></html>⌨️ 快捷键说明
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