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<a href="index.html" title="FreeType-2.11.0 API Reference" class="md-nav__button md-logo" aria-label="FreeType-2.11.0 API Reference" data-md-component="logo"> + <nav class="md-nav md-nav--primary" data-md-level="0"> + <label class="md-nav__title md-nav__title--site" for="__drawer"> + <a href="." title="FreeType-2.10.4 API Reference" class="md-nav__button md-logo"> + + <img alt="logo" src="images/favico.ico" width="48" height="48"> - <img src="images/favico.ico" alt="logo"> - </a> - FreeType-2.11.0 API Reference + FreeType-2.10.4 API Reference </label> <ul class="md-nav__list" data-md-scrollfix> @@ -175,564 +182,516 @@ - - - - <li class="md-nav__item"> - <a href="index.html" class="md-nav__link"> - TOC - </a> - </li> - + + <li class="md-nav__item"> + <a href="index.html" title="TOC" class="md-nav__link"> + TOC + </a> + </li> - - - - <li class="md-nav__item"> - <a href="ft2-index.html" class="md-nav__link"> - Index - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-index.html" title="Index" class="md-nav__link"> + Index + </a> + </li> - 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<span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Core API" data-md-level="1"> - <label class="md-nav__title" for="__nav_4"> - <span class="md-nav__icon md-icon"></span> - Core API - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + + - - - - - <li class="md-nav__item"> - <a href="ft2-version.html" class="md-nav__link"> - FreeType Version - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-basic_types.html" class="md-nav__link"> - Basic Data Types - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-version.html" title="FreeType Version" class="md-nav__link"> + FreeType Version + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-base_interface.html" class="md-nav__link"> - Base Interface - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-basic_types.html" title="Basic Data Types" class="md-nav__link"> + Basic Data Types + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-glyph_variants.html" class="md-nav__link"> - Unicode Variation Sequences - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-base_interface.html" title="Base Interface" class="md-nav__link"> + Base Interface + </a> + </li> + + + - - - - - <li class="md-nav__item"> - <a href="ft2-color_management.html" class="md-nav__link"> - Glyph Color Management - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-glyph_variants.html" title="Unicode Variation Sequences" class="md-nav__link"> + Unicode Variation Sequences + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-layer_management.html" class="md-nav__link"> - Glyph Layer Management - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-color_management.html" title="Glyph Color Management" class="md-nav__link"> + Glyph Color Management + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-glyph_management.html" class="md-nav__link"> - Glyph Management - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-layer_management.html" title="Glyph Layer Management" class="md-nav__link"> + Glyph Layer Management + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-mac_specific.html" class="md-nav__link"> - Mac Specific Interface - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-glyph_management.html" title="Glyph Management" class="md-nav__link"> + Glyph Management + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-sizes_management.html" class="md-nav__link"> - Size Management - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-mac_specific.html" title="Mac Specific Interface" class="md-nav__link"> + Mac Specific Interface + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-header_file_macros.html" class="md-nav__link"> - Header File Macros - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-sizes_management.html" title="Size Management" class="md-nav__link"> + Size Management + </a> + </li> + - </ul> - </nav> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-header_file_macros.html" title="Header File Macros" class="md-nav__link"> + Header File Macros + </a> + </li> + + + </ul> + </nav> + </li> - - - + + <li class="md-nav__item md-nav__item--nested"> - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5" type="checkbox" id="__nav_5" > - - <label class="md-nav__link" for="__nav_5"> + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-5" type="checkbox" id="nav-5"> + + <label class="md-nav__link" for="nav-5"> + Format-Specific API + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-5"> Format-Specific API - <span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Format-Specific API" data-md-level="1"> - <label class="md-nav__title" for="__nav_5"> - <span class="md-nav__icon md-icon"></span> - Format-Specific API - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + - - - - - <li class="md-nav__item"> - <a href="ft2-multiple_masters.html" class="md-nav__link"> - Multiple Masters - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-truetype_tables.html" class="md-nav__link"> - TrueType Tables - </a> - </li> - + + + <li class="md-nav__item"> + <a href="ft2-multiple_masters.html" title="Multiple Masters" class="md-nav__link"> + Multiple Masters + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-type1_tables.html" class="md-nav__link"> - Type 1 Tables - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-truetype_tables.html" title="TrueType Tables" class="md-nav__link"> + TrueType Tables + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-sfnt_names.html" class="md-nav__link"> - SFNT Names - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-type1_tables.html" title="Type 1 Tables" class="md-nav__link"> + Type 1 Tables + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-bdf_fonts.html" class="md-nav__link"> - BDF and PCF Files - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-sfnt_names.html" title="SFNT Names" class="md-nav__link"> + SFNT Names + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-cid_fonts.html" class="md-nav__link"> - CID Fonts - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-bdf_fonts.html" title="BDF and PCF Files" class="md-nav__link"> + BDF and PCF Files + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-pfr_fonts.html" class="md-nav__link"> - PFR Fonts - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-cid_fonts.html" title="CID Fonts" class="md-nav__link"> + CID Fonts + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-winfnt_fonts.html" class="md-nav__link"> - Window FNT Files - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-pfr_fonts.html" title="PFR Fonts" class="md-nav__link"> + PFR Fonts + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-font_formats.html" class="md-nav__link"> - Font Formats - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-winfnt_fonts.html" title="Window FNT Files" class="md-nav__link"> + Window FNT Files + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-gasp_table.html" class="md-nav__link"> - Gasp Table - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-font_formats.html" title="Font Formats" class="md-nav__link"> + Font Formats + </a> + </li> + + + - </ul> - </nav> - </li> - + + + <li class="md-nav__item"> + <a href="ft2-gasp_table.html" title="Gasp Table" class="md-nav__link"> + Gasp Table + </a> + </li> + + + </ul> + </nav> + </li> - - - + + <li class="md-nav__item md-nav__item--nested"> - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" > - - <label class="md-nav__link" for="__nav_6"> + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-6" type="checkbox" id="nav-6"> + + <label class="md-nav__link" for="nav-6"> + Controlling FreeType Modules + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-6"> Controlling FreeType Modules - <span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Controlling FreeType Modules" data-md-level="1"> - <label class="md-nav__title" for="__nav_6"> - <span class="md-nav__icon md-icon"></span> - Controlling FreeType Modules - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + - - - - - <li class="md-nav__item"> - <a href="ft2-auto_hinter.html" class="md-nav__link"> - The auto-hinter - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-cff_driver.html" class="md-nav__link"> - The CFF driver - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-auto_hinter.html" title="The auto-hinter" class="md-nav__link"> + The auto-hinter + </a> + </li> + + + - - - - - <li class="md-nav__item"> - <a href="ft2-t1_cid_driver.html" class="md-nav__link"> - The Type 1 and CID drivers - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-cff_driver.html" title="The CFF driver" class="md-nav__link"> + The CFF driver + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-tt_driver.html" class="md-nav__link"> - The TrueType driver - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-t1_cid_driver.html" title="The Type 1 and CID drivers" class="md-nav__link"> + The Type 1 and CID drivers + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-pcf_driver.html" class="md-nav__link"> - The PCF driver - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-tt_driver.html" title="The TrueType driver" class="md-nav__link"> + The TrueType driver + </a> + </li> + + + - - - - - <li class="md-nav__item"> - <a href="ft2-properties.html" class="md-nav__link"> - Driver properties - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-pcf_driver.html" title="The PCF driver" class="md-nav__link"> + The PCF driver + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-parameter_tags.html" class="md-nav__link"> - Parameter Tags - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-properties.html" title="Driver properties" class="md-nav__link"> + Driver properties + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-lcd_rendering.html" class="md-nav__link"> - Subpixel Rendering - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-parameter_tags.html" title="Parameter Tags" class="md-nav__link"> + Parameter Tags + </a> + </li> + - </ul> - </nav> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-lcd_rendering.html" title="Subpixel Rendering" class="md-nav__link"> + Subpixel Rendering + </a> + </li> + + + </ul> + </nav> + </li> - - - + + <li class="md-nav__item md-nav__item--nested"> - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" > - - <label class="md-nav__link" for="__nav_7"> + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-7" type="checkbox" id="nav-7"> + + <label class="md-nav__link" for="nav-7"> + Cache Sub-System + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-7"> Cache Sub-System - <span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1"> - <label class="md-nav__title" for="__nav_7"> - <span class="md-nav__icon md-icon"></span> - Cache Sub-System - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + - - - - - <li class="md-nav__item"> - <a href="ft2-cache_subsystem.html" class="md-nav__link"> - Cache Sub-System - </a> - </li> - - - </ul> - </nav> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-cache_subsystem.html" title="Cache Sub-System" class="md-nav__link"> + Cache Sub-System + </a> + </li> + + + </ul> + </nav> + </li> @@ -740,123 +699,113 @@ - + + + <li class="md-nav__item md-nav__item--active md-nav__item--nested"> - - + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-8" type="checkbox" id="nav-8" checked> - <li class="md-nav__item md-nav__item--active md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_8" type="checkbox" id="__nav_8" checked> - - <label class="md-nav__link" for="__nav_8"> + <label class="md-nav__link" for="nav-8"> + Support API + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-8"> Support API - <span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Support API" data-md-level="1"> - <label class="md-nav__title" for="__nav_8"> - <span class="md-nav__icon md-icon"></span> - Support API - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-computations.html" class="md-nav__link"> - Computations - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-computations.html" title="Computations" class="md-nav__link"> + Computations + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-list_processing.html" class="md-nav__link"> - List Processing - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-list_processing.html" title="List Processing" class="md-nav__link"> + List Processing + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-outline_processing.html" class="md-nav__link"> - Outline Processing - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-outline_processing.html" title="Outline Processing" class="md-nav__link"> + Outline Processing + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-quick_advance.html" class="md-nav__link"> - Quick retrieval of advance values - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-quick_advance.html" title="Quick retrieval of advance values" class="md-nav__link"> + Quick retrieval of advance values + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-bitmap_handling.html" class="md-nav__link"> - Bitmap Handling - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-bitmap_handling.html" title="Bitmap Handling" class="md-nav__link"> + Bitmap Handling + </a> + </li> + - - + + + + + + <li class="md-nav__item md-nav__item--active"> + + <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="__toc"> - - - <li class="md-nav__item md-nav__item--active"> - - <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc"> - - - - - - <label class="md-nav__link md-nav__link--active" for="__toc"> - Scanline Converter - <span class="md-nav__icon md-icon"></span> - </label> - <a href="ft2-raster.html" class="md-nav__link md-nav__link--active"> + + + <label class="md-nav__link md-nav__link--active" for="__toc"> Scanline Converter - </a> + </label> + + <a href="ft2-raster.html" title="Scanline Converter" class="md-nav__link md-nav__link--active"> + Scanline Converter + </a> + - -<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> - +<nav class="md-nav md-nav--secondary"> - <label class="md-nav__title" for="__toc"> - <span class="md-nav__icon md-icon"></span> - Table of contents - </label> - <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> + <label class="md-nav__title" for="__toc">Table of contents</label> + <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="#synopsis" class="md-nav__link"> @@ -866,6 +815,13 @@ </li> <li class="md-nav__item"> + <a href="#ft_raster" class="md-nav__link"> + FT_Raster + </a> + +</li> + + <li class="md-nav__item"> <a href="#ft_span" class="md-nav__link"> FT_Span </a> @@ -894,13 +850,6 @@ </li> <li class="md-nav__item"> - <a href="#ft_raster" class="md-nav__link"> - FT_Raster - </a> - -</li> - - <li class="md-nav__item"> <a href="#ft_raster_newfunc" class="md-nav__link"> FT_Raster_NewFunc </a> @@ -956,234 +905,212 @@ </li> + + + + </ul> </nav> - - </li> - + + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-glyph_stroker.html" class="md-nav__link"> - Glyph Stroker - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-system_interface.html" class="md-nav__link"> - System Interface - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-module_management.html" class="md-nav__link"> - Module Management - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-glyph_stroker.html" title="Glyph Stroker" class="md-nav__link"> + Glyph Stroker + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-gzip.html" class="md-nav__link"> - GZIP Streams - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-system_interface.html" title="System Interface" class="md-nav__link"> + System Interface + </a> + </li> + + + + - - - - - <li class="md-nav__item"> - <a href="ft2-lzw.html" class="md-nav__link"> - LZW Streams - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-module_management.html" title="Module Management" class="md-nav__link"> + Module Management + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-bzip2.html" class="md-nav__link"> - BZIP2 Streams - </a> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-gzip.html" title="GZIP Streams" class="md-nav__link"> + GZIP Streams + </a> + </li> + + + - - - - - <li class="md-nav__item"> - <a href="ft2-debugging_apis.html" class="md-nav__link"> - External Debugging APIs - </a> - </li> - + + <li class="md-nav__item"> + <a href="ft2-lzw.html" title="LZW Streams" class="md-nav__link"> + LZW Streams + </a> + </li> + + - </ul> - </nav> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-bzip2.html" title="BZIP2 Streams" class="md-nav__link"> + BZIP2 Streams + </a> + </li> + + + </ul> + </nav> + </li> - - - + + <li class="md-nav__item md-nav__item--nested"> - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_9" type="checkbox" id="__nav_9" > - - <label class="md-nav__link" for="__nav_9"> + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-9" type="checkbox" id="nav-9"> + + <label class="md-nav__link" for="nav-9"> + Error Codes + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-9"> Error Codes - <span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Error Codes" data-md-level="1"> - <label class="md-nav__title" for="__nav_9"> - <span class="md-nav__icon md-icon"></span> - Error Codes - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + - - - - - <li class="md-nav__item"> - <a href="ft2-error_enumerations.html" class="md-nav__link"> - Error Enumerations - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-error_code_values.html" class="md-nav__link"> - Error Code Values - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-error_enumerations.html" title="Error Enumerations" class="md-nav__link"> + Error Enumerations + </a> + </li> + - </ul> - </nav> - </li> - + + + + + <li class="md-nav__item"> + <a href="ft2-error_code_values.html" title="Error Code Values" class="md-nav__link"> + Error Code Values + </a> + </li> + + + </ul> + </nav> + </li> - - - + + <li class="md-nav__item md-nav__item--nested"> - <li class="md-nav__item md-nav__item--nested"> - - - <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_10" type="checkbox" id="__nav_10" > - - <label class="md-nav__link" for="__nav_10"> + <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10"> + + <label class="md-nav__link" for="nav-10"> + Miscellaneous + </label> + <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> + <label class="md-nav__title" for="nav-10"> Miscellaneous - <span class="md-nav__icon md-icon"></span> </label> - <nav class="md-nav" aria-label="Miscellaneous" data-md-level="1"> - <label class="md-nav__title" for="__nav_10"> - <span class="md-nav__icon md-icon"></span> - Miscellaneous - </label> - <ul class="md-nav__list" data-md-scrollfix> + <ul class="md-nav__list" data-md-scrollfix> + + - - - - - <li class="md-nav__item"> - <a href="ft2-gx_validation.html" class="md-nav__link"> - TrueTypeGX/AAT Validation - </a> - </li> - - - - - - - <li class="md-nav__item"> - <a href="ft2-incremental.html" class="md-nav__link"> - Incremental Loading - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link"> + TrueTypeGX/AAT Validation + </a> + </li> + - - - - - <li class="md-nav__item"> - <a href="ft2-truetype_engine.html" class="md-nav__link"> - The TrueType Engine - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-incremental.html" title="Incremental Loading" class="md-nav__link"> + Incremental Loading + </a> + </li> + + - - - - - <li class="md-nav__item"> - <a href="ft2-ot_validation.html" class="md-nav__link"> - OpenType Validation - </a> - </li> - + + + + <li class="md-nav__item"> + <a href="ft2-truetype_engine.html" title="The TrueType Engine" class="md-nav__link"> + The TrueType Engine + </a> + </li> + + + + - </ul> - </nav> - </li> - + + + <li class="md-nav__item"> + <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link"> + OpenType Validation + </a> + </li> + + + </ul> + </nav> + </li> </ul> @@ -1193,23 +1120,18 @@ </div> - - <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > + <div class="md-sidebar md-sidebar--secondary" data-md-component="toc"> <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner"> -<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> - +<nav class="md-nav md-nav--secondary"> - <label class="md-nav__title" for="__toc"> - <span class="md-nav__icon md-icon"></span> - Table of contents - </label> - <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> + <label class="md-nav__title" for="__toc">Table of contents</label> + <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="#synopsis" class="md-nav__link"> @@ -1219,6 +1141,13 @@ </li> <li class="md-nav__item"> + <a href="#ft_raster" class="md-nav__link"> + FT_Raster + </a> + +</li> + + <li class="md-nav__item"> <a href="#ft_span" class="md-nav__link"> FT_Span </a> @@ -1247,13 +1176,6 @@ </li> <li class="md-nav__item"> - <a href="#ft_raster" class="md-nav__link"> - FT_Raster - </a> - -</li> - - <li class="md-nav__item"> <a href="#ft_raster_newfunc" class="md-nav__link"> FT_Raster_NewFunc </a> @@ -1309,6 +1231,10 @@ </li> + + + + </ul> </nav> @@ -1317,7 +1243,7 @@ </div> - <div class="md-content" data-md-component="content"> + <div class="md-content"> <article class="md-content__inner md-typeset"> @@ -1326,10 +1252,15 @@ <hr /> <h1 id="scanline-converter">Scanline Converter<a class="headerlink" href="#scanline-converter" title="Permanent link">¶</a></h1> <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> -<p>A raster or a rasterizer is a scan converter in charge of producing a pixel coverage bitmap that can be used as an alpha channel when compositing a glyph with a background. FreeType comes with two rasterizers: bilevel <code>raster1</code> and anti-aliased <code>smooth</code> are two separate modules. They are usually called from the high-level <code><a href="ft2-base_interface.html#ft_load_glyph">FT_Load_Glyph</a></code> or <code><a href="ft2-base_interface.html#ft_render_glyph">FT_Render_Glyph</a></code> functions and produce the entire coverage bitmap at once, while staying largely invisible to users.</p> -<p>Instead of working with complete coverage bitmaps, it is also possible to intercept consecutive pixel runs on the same scanline with the same coverage, called <em>spans</em>, and process them individually. Only the <code>smooth</code> rasterizer permits this when calling <code><a href="ft2-outline_processing.html#ft_outline_render">FT_Outline_Render</a></code> with <code><a href="ft2-raster.html#ft_raster_params">FT_Raster_Params</a></code> as described below.</p> -<p>Working with either complete bitmaps or spans it is important to think of them as colorless coverage objects suitable as alpha channels to blend arbitrary colors with a background. For best results, it is recommended to use gamma correction, too.</p> -<p>This section also describes the public API needed to set up alternative <code><a href="ft2-module_management.html#ft_renderer">FT_Renderer</a></code> modules.</p> +<p>This section contains technical definitions.</p> +<h2 id="ft_raster">FT_Raster<a class="headerlink" href="#ft_raster" title="Permanent link">¶</a></h2> +<p>Defined in FT_IMAGE_H (freetype/ftimage.h).</p> +<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_RasterRec_* <b>FT_Raster</b>; +</code></pre></div> + +<p>An opaque handle (pointer) to a raster object. Each object can be used independently to convert an outline into a bitmap or pixmap.</p> +<hr> + <h2 id="ft_span">FT_Span<a class="headerlink" href="#ft_span" title="Permanent link">¶</a></h2> <p>Defined in FT_IMAGE_H (freetype/ftimage.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Span_ @@ -1341,8 +1272,9 @@ } <b>FT_Span</b>; </code></pre></div> -<p>A structure to model a single span of consecutive pixels when rendering an anti-aliased bitmap.</p> +<p>A structure used to model a single span of gray pixels when rendering an anti-aliased bitmap.</p> <h4>fields</h4> + <table class="fields"> <tr><td class="val" id="x">x</td><td class="desc"> <p>The span's horizontal start position.</p> @@ -1358,7 +1290,7 @@ <h4>note</h4> <p>This structure is used by the span drawing callback type named <code><a href="ft2-raster.html#ft_spanfunc">FT_SpanFunc</a></code> that takes the y coordinate of the span as a parameter.</p> -<p>The anti-aliased rasterizer produces coverage values from 0 to 255, this is, from completely transparent to completely opaque.</p> +<p>The coverage value is always between 0 and 255. If you want less gray values, the callback function has to reduce them.</p> <hr> <h2 id="ft_spanfunc">FT_SpanFunc<a class="headerlink" href="#ft_spanfunc" title="Permanent link">¶</a></h2> @@ -1372,8 +1304,9 @@ #<span class="keyword">define</span> FT_Raster_Span_Func <b>FT_SpanFunc</b> </code></pre></div> -<p>A function used as a call-back by the anti-aliased renderer in order to let client applications draw themselves the pixel spans on each scan line.</p> +<p>A function used as a call-back by the anti-aliased renderer in order to let client applications draw themselves the gray pixel spans on each scan line.</p> <h4>input</h4> + <table class="fields"> <tr><td class="val" id="y">y</td><td class="desc"> <p>The scanline's upward y coordinate.</p> @@ -1391,8 +1324,8 @@ <h4>note</h4> -<p>This callback allows client applications to directly render the spans of the anti-aliased bitmap to any kind of surfaces.</p> -<p>This can be used to write anti-aliased outlines directly to a given background bitmap using alpha compositing. It can also be used for oversampling and averaging.</p> +<p>This callback allows client applications to directly render the gray spans of the anti-aliased bitmap to any kind of surfaces.</p> +<p>This can be used to write anti-aliased outlines directly to a given background bitmap, and even perform translucency.</p> <hr> <h2 id="ft_raster_params">FT_Raster_Params<a class="headerlink" href="#ft_raster_params" title="Permanent link">¶</a></h2> @@ -1414,6 +1347,7 @@ <p>A structure to hold the parameters used by a raster's render function, passed as an argument to <code><a href="ft2-outline_processing.html#ft_outline_render">FT_Outline_Render</a></code>.</p> <h4>fields</h4> + <table class="fields"> <tr><td class="val" id="target">target</td><td class="desc"> <p>The target bitmap.</p> @@ -1457,7 +1391,6 @@ #<span class="keyword">define</span> <a href="ft2-raster.html#ft_raster_flag_aa">FT_RASTER_FLAG_AA</a> 0x1 #<span class="keyword">define</span> <a href="ft2-raster.html#ft_raster_flag_direct">FT_RASTER_FLAG_DIRECT</a> 0x2 #<span class="keyword">define</span> <a href="ft2-raster.html#ft_raster_flag_clip">FT_RASTER_FLAG_CLIP</a> 0x4 -#<span class="keyword">define</span> <a href="ft2-raster.html#ft_raster_flag_sdf">FT_RASTER_FLAG_SDF</a> 0x8 /* these constants are deprecated; use the corresponding */ /* `<b>FT_RASTER_FLAG_XXX</b>` values instead */ @@ -1469,6 +1402,7 @@ <p>A list of bit flag constants as used in the <code>flags</code> field of a <code><a href="ft2-raster.html#ft_raster_params">FT_Raster_Params</a></code> structure.</p> <h4>values</h4> + <table class="fields"> <tr><td class="val" id="ft_raster_flag_default">FT_RASTER_FLAG_DEFAULT</td><td class="desc"> <p>This value is 0.</p> @@ -1483,24 +1417,10 @@ <tr><td class="val" id="ft_raster_flag_clip">FT_RASTER_FLAG_CLIP</td><td class="desc"> <p>This flag is only used in direct rendering mode. If set, the output will be clipped to a box specified in the <code>clip_box</code> field of the <code><a href="ft2-raster.html#ft_raster_params">FT_Raster_Params</a></code> structure. Otherwise, the <code>clip_box</code> is effectively set to the bounding box and all spans are generated.</p> </td></tr> -<tr><td class="val" id="ft_raster_flag_sdf">FT_RASTER_FLAG_SDF</td><td class="desc"> -<p>This flag is set to indicate that a signed distance field glyph image should be generated. This is only used while rendering with the <code><a href="ft2-base_interface.html#ft_render_mode">FT_RENDER_MODE_SDF</a></code> render mode.</p> -</td></tr> </table> <hr> -<h2 id="ft_raster">FT_Raster<a class="headerlink" href="#ft_raster" title="Permanent link">¶</a></h2> -<p>Defined in FT_IMAGE_H (freetype/ftimage.h).</p> -<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_RasterRec_* <b>FT_Raster</b>; -</code></pre></div> - -<p>An opaque handle (pointer) to a raster object. Each object can be used independently to convert an outline into a bitmap or pixmap.</p> -<h4>note</h4> - -<p>In FreeType 2, all rasters are now encapsulated within specific <code><a href="ft2-module_management.html#ft_renderer">FT_Renderer</a></code> modules and only used in their context.</p> -<hr> - <h2 id="ft_raster_newfunc">FT_Raster_NewFunc<a class="headerlink" href="#ft_raster_newfunc" title="Permanent link">¶</a></h2> <p>Defined in FT_IMAGE_H (freetype/ftimage.h).</p> <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">int</span> @@ -1512,6 +1432,7 @@ <p>A function used to create a new raster object.</p> <h4>input</h4> + <table class="fields"> <tr><td class="val" id="memory">memory</td><td class="desc"> <p>A handle to the memory allocator.</p> @@ -1519,6 +1440,7 @@ </table> <h4>output</h4> + <table class="fields"> <tr><td class="val" id="raster">raster</td><td class="desc"> <p>A handle to the new raster object.</p> @@ -1543,6 +1465,7 @@ <p>A function used to destroy a given raster object.</p> <h4>input</h4> + <table class="fields"> <tr><td class="val" id="raster">raster</td><td class="desc"> <p>A handle to the raster object.</p> @@ -1564,6 +1487,7 @@ <p>FreeType used to provide an area of memory called the ‘render pool’ available to all registered rasterizers. This was not thread safe, however, and now FreeType never allocates this pool.</p> <p>This function is called after a new raster object is created.</p> <h4>input</h4> + <table class="fields"> <tr><td class="val" id="raster">raster</td><td class="desc"> <p>A handle to the new raster object.</p> @@ -1593,6 +1517,7 @@ <p>This function is a generic facility to change modes or attributes in a given raster. This can be used for debugging purposes, or simply to allow implementation-specific ‘features’ in a given raster module.</p> <h4>input</h4> + <table class="fields"> <tr><td class="val" id="raster">raster</td><td class="desc"> <p>A handle to the new raster object.</p> @@ -1618,6 +1543,7 @@ <p>Invoke a given raster to scan-convert a given glyph image into a target bitmap.</p> <h4>input</h4> + <table class="fields"> <tr><td class="val" id="raster">raster</td><td class="desc"> <p>A handle to the raster object.</p> @@ -1653,6 +1579,7 @@ <p>A structure used to describe a given raster class to the library.</p> <h4>fields</h4> + <table class="fields"> <tr><td class="val" id="glyph_format">glyph_format</td><td class="desc"> <p>The supported glyph format for this raster.</p> @@ -1695,6 +1622,9 @@ <p>Deprecated, unimplemented.</p> <hr> + + + @@ -1704,60 +1634,59 @@ </article> </div> </div> - </main> <footer class="md-footer"> - <nav class="md-footer__inner md-grid" aria-label="Footer"> - + <div class="md-footer-nav"> + <nav class="md-footer-nav__inner md-grid"> - <a href="ft2-bitmap_handling.html" class="md-footer__link md-footer__link--prev" aria-label="Previous: Bitmap Handling" rel="prev"> - <div class="md-footer__button md-icon"> - <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg> - </div> - <div class="md-footer__title"> - <div class="md-ellipsis"> - <span class="md-footer__direction"> - Previous + <a href="ft2-bitmap_handling.html" title="Bitmap Handling" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev"> + <div class="md-flex__cell md-flex__cell--shrink"> + <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i> + </div> + <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> + <span class="md-flex__ellipsis"> + <span class="md-footer-nav__direction"> + Previous + </span> + Bitmap Handling </span> - Bitmap Handling </div> - </div> - </a> - - + </a> + - <a href="ft2-glyph_stroker.html" class="md-footer__link md-footer__link--next" aria-label="Next: Glyph Stroker" rel="next"> - <div class="md-footer__title"> - <div class="md-ellipsis"> - <span class="md-footer__direction"> - Next + <a href="ft2-glyph_stroker.html" title="Glyph Stroker" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next"> + <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> + <span class="md-flex__ellipsis"> + <span class="md-footer-nav__direction"> + Next + </span> + Glyph Stroker </span> - Glyph Stroker </div> - </div> - <div class="md-footer__button md-icon"> - <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4z"/></svg> - </div> - </a> - - </nav> + <div class="md-flex__cell md-flex__cell--shrink"> + <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i> + </div> + </a> + + </nav> + </div> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class="md-footer-copyright"> <div class="md-footer-copyright__highlight"> - Copyright 2021 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. + Copyright 2020 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. </div> - Made with + powered by + <a href="https://www.mkdocs.org" target="_blank" rel="noopener">MkDocs</a> + and <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> - Material for MkDocs - </a> - + Material for MkDocs</a> </div> </div> @@ -1765,13 +1694,10 @@ </footer> </div> - <div class="md-dialog" data-md-component="dialog"> - <div class="md-dialog__inner md-typeset"></div> - </div> - <script id="__config" type="application/json">{"base": ".", "features": [], "translations": {"clipboard.copy": "Copy to clipboard", "clipboard.copied": "Copied to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.placeholder": "Type to start searching", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.term.missing": "Missing", "select.version.title": "Select version"}, "search": "assets/javascripts/workers/search.477d984a.min.js", "version": null}</script> - - <script src="assets/javascripts/bundle.82b56eb2.min.js"></script> + <script src="assets/javascripts/application.c33a9706.js"></script> + + <script>app.initialize({version:"1.1",url:{base:"."}})</script> <script src="javascripts/extra.js"></script> |