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341 Glyph Color Management
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396 <li class="md-nav__item">
397 <a href="#ft_palette_set_foreground_color" class="md-nav__link">
398 FT_Palette_Set_Foreground_Color
419 <li class="md-nav__item">
420 <a href="ft2-layer_management.html" title="Glyph Layer Management" class="md-nav__link">
421 Glyph Layer Management
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633 Controlling FreeType Modules
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637 Controlling FreeType Modules
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841 Quick retrieval of advance values
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1084 <label class="md-nav__title" for="__toc">Table of contents</label>
1085 <ul class="md-nav__list" data-md-scrollfix>
1087 <li class="md-nav__item">
1088 <a href="#synopsis" class="md-nav__link">
1094 <li class="md-nav__item">
1095 <a href="#ft_color" class="md-nav__link">
1101 <li class="md-nav__item">
1102 <a href="#ft_palette_xxx" class="md-nav__link">
1108 <li class="md-nav__item">
1109 <a href="#ft_palette_data" class="md-nav__link">
1115 <li class="md-nav__item">
1116 <a href="#ft_palette_data_get" class="md-nav__link">
1122 <li class="md-nav__item">
1123 <a href="#ft_palette_select" class="md-nav__link">
1129 <li class="md-nav__item">
1130 <a href="#ft_palette_set_foreground_color" class="md-nav__link">
1131 FT_Palette_Set_Foreground_Color
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1149 <article class="md-content__inner md-typeset">
1153 <p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#core-api">Core API</a> » Glyph Color Management</p>
1155 <h1 id="glyph-color-management">Glyph Color Management<a class="headerlink" href="#glyph-color-management" title="Permanent link">¶</a></h1>
1156 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2>
1157 <p>The functions described here allow access and manipulation of color palette entries in OpenType's ‘CPAL’ tables.</p>
1158 <h2 id="ft_color">FT_Color<a class="headerlink" href="#ft_color" title="Permanent link">¶</a></h2>
1159 <p>Defined in FT_COLOR_H (freetype/ftcolor.h).</p>
1160 <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Color_
1162 <a href="ft2-basic_types.html#ft_byte">FT_Byte</a> blue;
1163 <a href="ft2-basic_types.html#ft_byte">FT_Byte</a> green;
1164 <a href="ft2-basic_types.html#ft_byte">FT_Byte</a> red;
1165 <a href="ft2-basic_types.html#ft_byte">FT_Byte</a> alpha;
1170 <p>This structure models a BGRA color value of a ‘CPAL’ palette entry.</p>
1171 <p>The used color space is sRGB; the colors are not pre-multiplied, and alpha values must be explicitly set.</p>
1174 <table class="fields">
1175 <tr><td class="val" id="blue">blue</td><td class="desc">
1178 <tr><td class="val" id="green">green</td><td class="desc">
1181 <tr><td class="val" id="red">red</td><td class="desc">
1184 <tr><td class="val" id="alpha">alpha</td><td class="desc">
1185 <p>Alpha value, giving the red, green, and blue color's opacity.</p>
1194 <h2 id="ft_palette_xxx">FT_PALETTE_XXX<a class="headerlink" href="#ft_palette_xxx" title="Permanent link">¶</a></h2>
1195 <p>Defined in FT_COLOR_H (freetype/ftcolor.h).</p>
1196 <div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-color_management.html#ft_palette_for_light_background">FT_PALETTE_FOR_LIGHT_BACKGROUND</a> 0x01
1197 #<span class="keyword">define</span> <a href="ft2-color_management.html#ft_palette_for_dark_background">FT_PALETTE_FOR_DARK_BACKGROUND</a> 0x02
1200 <p>A list of bit field constants used in the <code>palette_flags</code> array of the <code><a href="ft2-color_management.html#ft_palette_data">FT_Palette_Data</a></code> structure to indicate for which background a palette with a given index is usable.</p>
1203 <table class="fields long">
1204 <tr><td class="val" id="ft_palette_for_light_background">FT_PALETTE_FOR_LIGHT_BACKGROUND</td><td class="desc">
1205 <p>The palette is appropriate to use when displaying the font on a light background such as white.</p>
1207 <tr><td class="val" id="ft_palette_for_dark_background">FT_PALETTE_FOR_DARK_BACKGROUND</td><td class="desc">
1208 <p>The palette is appropriate to use when displaying the font on a dark background such as black.</p>
1217 <h2 id="ft_palette_data">FT_Palette_Data<a class="headerlink" href="#ft_palette_data" title="Permanent link">¶</a></h2>
1218 <p>Defined in FT_COLOR_H (freetype/ftcolor.h).</p>
1219 <div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Palette_Data_ {
1220 <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a> num_palettes;
1221 <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a>* palette_name_ids;
1222 <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a>* palette_flags;
1224 <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a> num_palette_entries;
1225 <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a>* palette_entry_name_ids;
1227 } <b>FT_Palette_Data</b>;
1230 <p>This structure holds the data of the ‘CPAL’ table.</p>
1233 <table class="fields">
1234 <tr><td class="val" id="num_palettes">num_palettes</td><td class="desc">
1235 <p>The number of palettes.</p>
1237 <tr><td class="val" id="palette_name_ids">palette_name_ids</td><td class="desc">
1238 <p>An optional read-only array of palette name IDs with <code>num_palettes</code> elements, corresponding to entries like ‘dark’ or ‘light’ in the font's ‘name’ table.</p>
1239 <p>An empty name ID in the ‘CPAL’ table gets represented as value 0xFFFF.</p>
1240 <p><code>NULL</code> if the font's ‘CPAL’ table doesn't contain appropriate data.</p>
1242 <tr><td class="val" id="palette_flags">palette_flags</td><td class="desc">
1243 <p>An optional read-only array of palette flags with <code>num_palettes</code> elements. Possible values are an ORed combination of <code><a href="ft2-color_management.html#ft_palette_xxx">FT_PALETTE_FOR_LIGHT_BACKGROUND</a></code> and <code><a href="ft2-color_management.html#ft_palette_xxx">FT_PALETTE_FOR_DARK_BACKGROUND</a></code>.</p>
1244 <p><code>NULL</code> if the font's ‘CPAL’ table doesn't contain appropriate data.</p>
1246 <tr><td class="val" id="num_palette_entries">num_palette_entries</td><td class="desc">
1247 <p>The number of entries in a single palette. All palettes have the same size.</p>
1249 <tr><td class="val" id="palette_entry_name_ids">palette_entry_name_ids</td><td class="desc">
1250 <p>An optional read-only array of palette entry name IDs with <code>num_palette_entries</code>. In each palette, entries with the same index have the same function. For example, index 0 might correspond to string ‘outline’ in the font's ‘name’ table to indicate that this palette entry is used for outlines, index 1 might correspond to ‘fill’ to indicate the filling color palette entry, etc.</p>
1251 <p>An empty entry name ID in the ‘CPAL’ table gets represented as value 0xFFFF.</p>
1252 <p><code>NULL</code> if the font's ‘CPAL’ table doesn't contain appropriate data.</p>
1258 <p>Use function <code><a href="ft2-sfnt_names.html#ft_get_sfnt_name">FT_Get_Sfnt_Name</a></code> to map name IDs and entry name IDs to name strings.</p>
1259 <p>Use function <code><a href="ft2-color_management.html#ft_palette_select">FT_Palette_Select</a></code> to get the colors associated with a palette entry.</p>
1265 <h2 id="ft_palette_data_get">FT_Palette_Data_Get<a class="headerlink" href="#ft_palette_data_get" title="Permanent link">¶</a></h2>
1266 <p>Defined in FT_COLOR_H (freetype/ftcolor.h).</p>
1267 <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
1268 <b>FT_Palette_Data_Get</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face,
1269 <a href="ft2-color_management.html#ft_palette_data">FT_Palette_Data</a> *apalette );
1272 <p>Retrieve the face's color palette data.</p>
1275 <table class="fields">
1276 <tr><td class="val" id="face">face</td><td class="desc">
1277 <p>The source face handle.</p>
1283 <table class="fields">
1284 <tr><td class="val" id="apalette">apalette</td><td class="desc">
1285 <p>A pointer to an <code><a href="ft2-color_management.html#ft_palette_data">FT_Palette_Data</a></code> structure.</p>
1291 <p>FreeType error code. 0 means success.</p>
1294 <p>All arrays in the returned <code><a href="ft2-color_management.html#ft_palette_data">FT_Palette_Data</a></code> structure are read-only.</p>
1295 <p>This function always returns an error if the config macro <code>TT_CONFIG_OPTION_COLOR_LAYERS</code> is not defined in <code>ftoption.h</code>.</p>
1301 <h2 id="ft_palette_select">FT_Palette_Select<a class="headerlink" href="#ft_palette_select" title="Permanent link">¶</a></h2>
1302 <p>Defined in FT_COLOR_H (freetype/ftcolor.h).</p>
1303 <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
1304 <b>FT_Palette_Select</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face,
1305 <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a> palette_index,
1306 <a href="ft2-color_management.html#ft_color">FT_Color</a>* *apalette );
1309 <p>This function has two purposes.</p>
1310 <p>(1) It activates a palette for rendering color glyphs, and</p>
1311 <p>(2) it retrieves all (unmodified) color entries of this palette. This function returns a read-write array, which means that a calling application can modify the palette entries on demand.</p>
1312 <p>A corollary of (2) is that calling the function, then modifying some values, then calling the function again with the same arguments resets all color entries to the original ‘CPAL’ values; all user modifications are lost.</p>
1315 <table class="fields">
1316 <tr><td class="val" id="face">face</td><td class="desc">
1317 <p>The source face handle.</p>
1319 <tr><td class="val" id="palette_index">palette_index</td><td class="desc">
1320 <p>The palette index.</p>
1326 <table class="fields">
1327 <tr><td class="val" id="apalette">apalette</td><td class="desc">
1328 <p>An array of color entries for a palette with index <code>palette_index</code>, having <code>num_palette_entries</code> elements (as found in the <code>FT_Palette_Data</code> structure). If <code>apalette</code> is set to <code>NULL</code>, no array gets returned (and no color entries can be modified).</p>
1329 <p>In case the font doesn't support color palettes, <code>NULL</code> is returned.</p>
1335 <p>FreeType error code. 0 means success.</p>
1338 <p>The array pointed to by <code>apalette_entries</code> is owned and managed by FreeType.</p>
1339 <p>This function always returns an error if the config macro <code>TT_CONFIG_OPTION_COLOR_LAYERS</code> is not defined in <code>ftoption.h</code>.</p>
1345 <h2 id="ft_palette_set_foreground_color">FT_Palette_Set_Foreground_Color<a class="headerlink" href="#ft_palette_set_foreground_color" title="Permanent link">¶</a></h2>
1346 <p>Defined in FT_COLOR_H (freetype/ftcolor.h).</p>
1347 <div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
1348 <b>FT_Palette_Set_Foreground_Color</b>( <a href="ft2-base_interface.html#ft_face">FT_Face</a> face,
1349 <a href="ft2-color_management.html#ft_color">FT_Color</a> foreground_color );
1352 <p>‘COLR’ uses palette index 0xFFFF to indicate a ‘text foreground color’. This function sets this value.</p>
1355 <table class="fields">
1356 <tr><td class="val" id="face">face</td><td class="desc">
1357 <p>The source face handle.</p>
1359 <tr><td class="val" id="foreground_color">foreground_color</td><td class="desc">
1360 <p>An <code>FT_Color</code> structure to define the text foreground color.</p>
1366 <p>FreeType error code. 0 means success.</p>
1369 <p>If this function isn't called, the text foreground color is set to white opaque (BGRA value 0xFFFFFFFF) if <code><a href="ft2-color_management.html#ft_palette_xxx">FT_PALETTE_FOR_DARK_BACKGROUND</a></code> is present for the current palette, and black opaque (BGRA value 0x000000FF) otherwise, including the case that no palette types are available in the ‘CPAL’ table.</p>
1370 <p>This function always returns an error if the config macro <code>TT_CONFIG_OPTION_COLOR_LAYERS</code> is not defined in <code>ftoption.h</code>.</p>
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