1 #ifndef __DALI_PLATFORM_TEXT_ABSTRACTION_FONT_CLIENT_H__
2 #define __DALI_PLATFORM_TEXT_ABSTRACTION_FONT_CLIENT_H__
5 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
21 #include <dali/public-api/object/base-handle.h>
22 #include <dali/public-api/images/bitmap-image.h>
23 #include <dali/public-api/common/dali-vector.h>
24 #include <dali/public-api/text-abstraction/text-abstraction-definitions.h>
25 #include <dali/public-api/text-abstraction/glyph-info.h>
26 #include <dali/public-api/text-abstraction/font-list.h>
31 namespace TextAbstraction
34 namespace Internal DALI_INTERNAL
40 * @brief FontClient provides access to font information and resources.
42 * <h3>Querying the System Fonts</h3>
44 * A "system font" is described by a "path" to a font file on the native filesystem, along with a "family" and "style".
45 * For example on the Ubuntu system a "Regular" style font from the "Ubuntu Mono" family can be accessed from "/usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf".
47 * <h3>Accessing Fonts</h3>
49 * A "font" is created from the system for a specific point size. A "FontId" is used to identify each font.
50 * For example two different fonts with point sizes 10 & 12 can be created from the "Ubuntu Mono" family:
52 * FontClient fontClient = FontClient::Get();
53 * FontId ubuntuMonoTen = fontClient.GetFontId( "/usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf", 10 );
54 * FontId ubuntuMonoTwelve = fontClient.GetFontId( "/usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf", 12 );
56 * Glyph metrics and bitmap resources can then be retrieved using the FontId.
58 class DALI_IMPORT_API FontClient : public BaseHandle
63 * @brief Retrieve a handle to the FontClient instance.
65 * @return A handle to the FontClient
67 static FontClient Get();
70 * @brief Create an uninitialized TextAbstraction handle.
77 * This is non-virtual since derived Handle types must not contain data or virtual methods.
82 * @brief This copy constructor is required for (smart) pointer semantics.
84 * @param[in] handle A reference to the copied handle.
86 FontClient( const FontClient& handle );
89 * @brief This assignment operator is required for (smart) pointer semantics.
91 * @param [in] handle A reference to the copied handle.
92 * @return A reference to this.
94 FontClient& operator=( const FontClient& handle );
97 * @brief Set the DPI of the target window.
99 * @note Multiple windows are not currently supported.
100 * @param[in] horizontalDpi The horizontal resolution in DPI.
101 * @param[in] verticalDpi The vertical resolution in DPI.
103 void SetDpi( unsigned int horizontalDpi, unsigned int verticalDpi );
106 * @brief Retrieve the list of fonts supported by the system.
108 * @param[out] systemFonts A list of font paths, family & style strings.
110 void GetSystemFonts( FontList& systemFonts );
113 * @brief Find an appropriate system-font for displaying a UTF-32 character.
115 * This is useful when localised strings are provided for multiple languages
116 * i.e. when a single default font does not work for all languages.
117 * @param[in] charcode The character for which a font is needed.
118 * @param[out] systemFont The path, family & style describing the font.
119 * @return True if an appropriate system font was found.
121 bool FindSystemFont( Character charcode, FontDescription& systemFont );
124 * @brief Retrieve the unique identifier for a font.
126 * @param[in] path The path to a font file.
127 * @param[in] pointSize The point size in 26.6 fractional points; the default point size is 12.
128 * @param[in] faceIndex The index of the font face (optional).
129 * @return A valid font ID, or zero if the font does not exist.
131 FontId GetFontId( const FontPath& path, PointSize26Dot6 pointSize = 12*64, FaceIndex faceIndex = 0 );
134 * @brief Retrieve the ID of the default font for displaying a UTF-32 character.
136 * This is useful when localised strings are provided for multiple languages
137 * i.e. when a single default font does not work for all languages.
138 * @param[in] charcode The character for which a font is needed.
139 * @return A valid font ID, or zero if no appropriate font was found.
141 FontId FindDefaultFont( Character charcode );
144 * @brief Retrieve the glyph index for a UTF-32 character code.
146 * @param[in] fontId The ID of the font for the required glyph.
147 * @param[in] charcode The UTF-32 character code.
148 * @return The glyph index, or zero if the character code is undefined.
150 GlyphIndex GetGlyphIndex( FontId fontId, Character charcode );
153 * @brief Retrieve the metrics for a series of glyphs.
155 * @param[in,out] array An array of glyph-info structures with initialized FontId & GlyphIndex values.
156 * On return, the remaining metrics values will be initialized e.g. glyph size & bearing values.
157 * @param[in] size The size of the array.
158 * @param[in] horizontal True for horizontal layouts (set to false for vertical layouting).
159 * @return True if all of the requested metrics were found.
161 bool GetGlyphMetrics( GlyphInfo* array, uint32_t size, bool horizontal = true );
164 * @brief Render a bitmap representation of a glyph.
166 * @param[in] fontId The ID of the font.
167 * @param[in] glyphIndex The index of a glyph within the specified font.
168 * @return A valid BitmapImage, or an empty handle if the glyph could not be rendered.
170 BitmapImage CreateBitmap( FontId fontId, GlyphIndex glyphIndex );
172 public: // Not intended for application developers
174 * @brief This constructor is used by FontClient::Get().
176 * @param[in] fontClient A pointer to the internal fontClient object.
178 explicit DALI_INTERNAL FontClient( Internal::FontClient* fontClient );
181 } // namespace TextAbstraction
185 #endif // __DALI_PLATFORM_TEXT_ABSTRACTION_FONT_CLIENT_H__