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.
22 #include <dali/public-api/object/base-handle.h>
23 #include <dali/public-api/images/bitmap-image.h>
24 #include <dali/public-api/text-abstraction/glyph-info.h>
25 #include <dali/public-api/text-abstraction/font-list.h>
26 #include <dali/public-api/text-abstraction/font-metrics.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 in 26.6 fractional points. 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*64 );
54 * FontId ubuntuMonoTwelve = fontClient.GetFontId( "/usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf", 12*64 );
56 * Glyph metrics and bitmap resources can then be retrieved using the FontId.
58 class DALI_IMPORT_API FontClient : public BaseHandle
61 static const PointSize26Dot6 DEFAULT_POINT_SIZE; ///< The default point size.
66 * @brief Retrieve a handle to the FontClient instance.
68 * @return A handle to the FontClient
70 static FontClient Get();
73 * @brief Create an uninitialized TextAbstraction handle.
80 * This is non-virtual since derived Handle types must not contain data or virtual methods.
85 * @brief This copy constructor is required for (smart) pointer semantics.
87 * @param[in] handle A reference to the copied handle.
89 FontClient( const FontClient& handle );
92 * @brief This assignment operator is required for (smart) pointer semantics.
94 * @param [in] handle A reference to the copied handle.
95 * @return A reference to this.
97 FontClient& operator=( const FontClient& handle );
99 ////////////////////////////////////////
100 // Font management and validation.
101 ////////////////////////////////////////
104 * @brief Set the DPI of the target window.
106 * @note Multiple windows are not currently supported.
107 * @param[in] horizontalDpi The horizontal resolution in DPI.
108 * @param[in] verticalDpi The vertical resolution in DPI.
110 void SetDpi( unsigned int horizontalDpi, unsigned int verticalDpi );
113 * @brief Retrieve the list of fonts supported by the system.
115 * @param[out] systemFonts A list of font paths, family & style strings.
117 void GetSystemFonts( FontList& systemFonts );
120 * @brief Retrieves the font description of a given font @p id.
122 * @param[in] id The font id.
123 * @param[out] fontDescription The path, family & style describing the font.
125 void GetDescription( FontId id, FontDescription& fontDescription );
128 * @brief Retrieves the font point size of a given font @p id.
130 * @param[in] id The font id.
132 * @return The point size in 26.6 fractional points.
134 PointSize26Dot6 GetPointSize( FontId id );
137 * @brief Find an appropriate font for displaying a UTF-32 character.
139 * This is useful when localised strings are provided for multiple languages
140 * i.e. when a single default font does not work for all languages.
141 * @param[in] charcode The character for which a font is needed.
142 * @param[in] pointSize The point size in 26.6 fractional points; the default point size is 12*64.
143 * @return A valid font ID, or zero if the font does not exist.
145 FontId FindDefaultFont( Character charcode,
146 PointSize26Dot6 pointSize = DEFAULT_POINT_SIZE );
149 * @brief Retrieve the unique identifier for a font.
151 * @param[in] path The path to a font file.
152 * @param[in] pointSize The point size in 26.6 fractional points; the default point size is 12*64.
153 * @param[in] faceIndex The index of the font face (optional).
154 * @return A valid font ID, or zero if the font does not exist.
156 FontId GetFontId( const FontPath& path, PointSize26Dot6 pointSize = DEFAULT_POINT_SIZE, FaceIndex faceIndex = 0 );
159 * @brief Retrieve the unique identifier for a font.
161 * @param[in] fontFamily The font family name.
162 * @param[in] fontStyle The font style.
163 * @param[in] pointSize The point size in 26.6 fractional points; the default point size is 12*64.
164 * @param[in] faceIndex The index of the font face (optional).
165 * @return A valid font ID, or zero if the font does not exist.
167 FontId GetFontId( const FontFamily& fontFamily,
168 const FontStyle& fontStyle,
169 PointSize26Dot6 pointSize = DEFAULT_POINT_SIZE,
170 FaceIndex faceIndex = 0 );
172 ////////////////////////////////////////
173 // Font metrics, glyphs and bitmaps.
174 ////////////////////////////////////////
177 * @brief Query the metrics for a font.
179 * @param[in] fontId The ID of the font for the required glyph.
180 * @param[out] metrics The font metrics.
182 void GetFontMetrics( FontId fontId, FontMetrics& metrics );
185 * @brief Retrieve the glyph index for a UTF-32 character code.
187 * @param[in] fontId The ID of the font for the required glyph.
188 * @param[in] charcode The UTF-32 character code.
189 * @return The glyph index, or zero if the character code is undefined.
191 GlyphIndex GetGlyphIndex( FontId fontId, Character charcode );
194 * @brief Retrieve the metrics for a series of glyphs.
196 * @param[in,out] array An array of glyph-info structures with initialized FontId & GlyphIndex values.
197 * On return, the remaining metrics values will be initialized e.g. glyph size & bearing values.
198 * @param[in] size The size of the array.
199 * @param[in] horizontal True for horizontal layouts (set to false for vertical layouting).
200 * @return True if all of the requested metrics were found.
202 bool GetGlyphMetrics( GlyphInfo* array, uint32_t size, bool horizontal = true );
205 * @brief Render a bitmap representation of a glyph.
207 * @param[in] fontId The ID of the font.
208 * @param[in] glyphIndex The index of a glyph within the specified font.
209 * @return A valid BitmapImage, or an empty handle if the glyph could not be rendered.
211 BitmapImage CreateBitmap( FontId fontId, GlyphIndex glyphIndex );
213 public: // Not intended for application developers
215 * @brief This constructor is used by FontClient::Get().
217 * @param[in] fontClient A pointer to the internal fontClient object.
219 explicit DALI_INTERNAL FontClient( Internal::FontClient* fontClient );
222 } // namespace TextAbstraction
226 #endif // __DALI_PLATFORM_TEXT_ABSTRACTION_FONT_CLIENT_H__