1 #ifndef DALI_INTERNAL_TEXT_ABSTRACTION_FONT_CLIENT_PLUGIN_IMPL_H
2 #define DALI_INTERNAL_TEXT_ABSTRACTION_FONT_CLIENT_PLUGIN_IMPL_H
5 * Copyright (c) 2021 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/devel-api/adaptor-framework/pixel-buffer.h>
23 #include <dali/devel-api/text-abstraction/bitmap-font.h>
24 #include <dali/devel-api/text-abstraction/font-metrics.h>
25 #include <dali/devel-api/text-abstraction/glyph-info.h>
26 #include <dali/internal/text/text-abstraction/font-client-impl.h>
28 #ifdef ENABLE_VECTOR_BASED_TEXT_RENDERING
29 #include <third-party/glyphy/vector-font-cache.h>
31 class VectorFontCache;
36 #include FT_FREETYPE_H
39 #include FT_SYNTHESIS_H
41 // forward declarations of font config types.
48 namespace TextAbstraction
53 * @brief Type used for indices addressing the vector with front descriptions of validated fonts.
55 typedef uint32_t FontDescriptionId;
58 * @brief Type used for indices addressing the vector with pixel buffers.
60 typedef uint32_t PixelBufferId;
63 * @brief Vector of character sets.
65 typedef Vector<_FcCharSet*> CharacterSetList;
68 * @brief FontClient implementation.
70 struct FontClient::Plugin
72 struct FontIdCacheItem
74 FontDescription::Type type; ///< The type of font.
75 FontId id; ///< Index to the cache of fonts for the specified type.
79 * @brief Caches an list of fallback fonts for a given font-description
81 struct FallbackCacheItem
83 FallbackCacheItem(FontDescription&& fontDescription, FontList* fallbackFonts, CharacterSetList* characterSets);
85 FontDescription fontDescription; ///< The font description.
86 FontList* fallbackFonts; ///< The list of fallback fonts for the given font-description.
87 CharacterSetList* characterSets; ///< The list of character sets for the given font-description.
91 * @brief Caches an index to the vector of font descriptions for a given font.
93 struct FontDescriptionCacheItem
95 FontDescriptionCacheItem(const FontDescription& fontDescription,
96 FontDescriptionId index);
97 FontDescriptionCacheItem(FontDescription&& fontDescription,
98 FontDescriptionId index);
100 FontDescription fontDescription; ///< The font description.
101 FontDescriptionId index; ///< Index to the vector of font descriptions.
105 * @brief Caches the font id of the pair font point size and the index to the vector of font descriptions of validated fonts.
107 struct FontDescriptionSizeCacheItem
109 FontDescriptionSizeCacheItem(FontDescriptionId validatedFontId,
110 PointSize26Dot6 requestedPointSize,
113 FontDescriptionId validatedFontId; ///< Index to the vector with font descriptions.
114 PointSize26Dot6 requestedPointSize; ///< The font point size.
115 FontId fontId; ///< The font identifier.
119 * @brief Caches the FreeType face and font metrics of the triplet 'path to the font file name, font point size and face index'.
121 struct FontFaceCacheItem
123 FontFaceCacheItem(FT_Face ftFace,
124 const FontPath& path,
125 PointSize26Dot6 requestedPointSize,
127 const FontMetrics& metrics);
129 FontFaceCacheItem(FT_Face ftFace,
130 const FontPath& path,
131 PointSize26Dot6 requestedPointSize,
133 const FontMetrics& metrics,
137 bool hasColorTables);
139 FT_Face mFreeTypeFace; ///< The FreeType face.
140 FontPath mPath; ///< The path to the font file name.
141 PointSize26Dot6 mRequestedPointSize; ///< The font point size.
142 FaceIndex mFaceIndex; ///< The face index.
143 FontMetrics mMetrics; ///< The font metrics.
144 _FcCharSet* mCharacterSet; ///< Pointer with the range of characters.
145 int mFixedSizeIndex; ///< Index to the fixed size table for the requested size.
146 float mFixedWidthPixels; ///< The height in pixels (fixed size bitmaps only)
147 float mFixedHeightPixels; ///< The height in pixels (fixed size bitmaps only)
148 unsigned int mVectorFontId; ///< The ID of the equivalent vector-based font
149 FontId mFontId; ///< Index to the vector with the cache of font's ids.
150 bool mIsFixedSizeBitmap : 1; ///< Whether the font has fixed size bitmaps.
151 bool mHasColorTables : 1; ///< Whether the font has color tables.
156 PointSize26Dot6 requestedPointSize;
161 * @brief Caches pixel buffers.
163 struct PixelBufferCacheItem
165 Devel::PixelBuffer pixelBuffer; ///< The pixel buffer loaded from the url.
166 std::string url; ///< The url.
170 * @brief Caches embedded items.
174 PixelBufferId pixelBufferId; ///< Index to the vector of pixel buffers
175 unsigned int width; ///< The desired width.
176 unsigned int height; ///< The desired height.
180 * @brief Stores a bitmap font and its pixel buffers per glyph.
182 struct BitmapFontCacheItem
184 BitmapFont font; ///< The bitmap font.
185 std::vector<Devel::PixelBuffer> pixelBuffers; ///< The pixel buffers of the glyphs.
186 FontId id; ///< Index to the vector with the cache of font's ids.
192 * Initializes the FreeType library.
193 * Initializes the dpi values.
195 * @param[in] horizontalDpi The horizontal dpi.
196 * @param[in] verticalDpi The vertical dpi.
198 Plugin(unsigned int horizontalDpi, unsigned int verticalDpi);
201 * Default destructor.
203 * Frees any allocated resource.
208 * @copydoc Dali::TextAbstraction::FontClient::ClearCache()
213 * @copydoc Dali::TextAbstraction::FontClient::SetDpi()
215 void SetDpi(unsigned int horizontalDpi, unsigned int verticalDpi);
218 * @copydoc Dali::TextAbstraction::FontClient::ResetSystemDefaults()
220 void ResetSystemDefaults();
223 * @copydoc Dali::TextAbstraction::FontClient::SetDefaultFont()
225 void SetDefaultFont(const FontDescription& preferredFontDescription);
228 * @copydoc Dali::TextAbstraction::FontClient::GetDefaultPlatformFontDescription()
230 void GetDefaultPlatformFontDescription(FontDescription& fontDescription);
233 * @copydoc Dali::TextAbstraction::FontClient::GetDefaultFonts()
235 void GetDefaultFonts(FontList& defaultFonts);
238 * @copydoc Dali::TextAbstraction::FontClient::GetSystemFonts()
240 void GetSystemFonts(FontList& systemFonts);
243 * @copydoc Dali::TextAbstraction::FontClient::GetDescription()
245 void GetDescription(FontId id, FontDescription& fontDescription) const;
248 * @copydoc Dali::TextAbstraction::FontClient::GetPointSize()
250 PointSize26Dot6 GetPointSize(FontId id);
253 * @copydoc Dali::TextAbstraction::FontClient::IsCharacterSupportedByFont()
255 bool IsCharacterSupportedByFont(FontId fontId, Character character);
258 * @brief Finds within the @p fontList a font which support the @p carcode.
260 * @param[in] fontList A list of font paths, family, width, weight and slant.
261 * @param[in] characterSetList A list that contains a character set for each description of the font list.
262 * @param[in] charcode The character for which a font is needed.
263 * @param[in] requestedPointSize The point size in 26.6 fractional points.
264 * @param[in] preferColor @e true if a color font is preferred.
266 * @return A valid font identifier, or zero if no font is found.
268 FontId FindFontForCharacter(const FontList& fontList,
269 const CharacterSetList& characterSetList,
271 PointSize26Dot6 requestedPointSize,
275 * @copydoc Dali::TextAbstraction::FontClient::FindDefaultFont()
277 FontId FindDefaultFont(Character charcode,
278 PointSize26Dot6 requestedPointSize,
282 * @copydoc Dali::TextAbstraction::FontClient::FindFallbackFont()
284 FontId FindFallbackFont(Character charcode,
285 const FontDescription& preferredFontDescription,
286 PointSize26Dot6 requestedPointSize,
290 * @see Dali::TextAbstraction::FontClient::GetFontId( const FontPath& path, PointSize26Dot6 requestedPointSize, FaceIndex faceIndex )
292 * @param[in] cacheDescription Whether to cache the font description.
294 FontId GetFontId(const FontPath& path,
295 PointSize26Dot6 requestedPointSize,
297 bool cacheDescription);
300 * @copydoc Dali::TextAbstraction::FontClient::GetFontId( const FontDescription& preferredFontDescription, PointSize26Dot6 requestedPointSize, FaceIndex faceIndex )
302 FontId GetFontId(const FontDescription& fontDescription,
303 PointSize26Dot6 requestedPointSize,
304 FaceIndex faceIndex);
307 * @copydoc Dali::TextAbstraction::FontClient::GetFontId( const BitmapFont& bitmapFont )
309 FontId GetFontId(const BitmapFont& bitmapFont);
312 * @copydoc Dali::TextAbstraction::FontClient::IsScalable( const FontPath& path )
314 bool IsScalable(const FontPath& path);
317 * @copydoc Dali::TextAbstraction::FontClient::IsScalable( const FontDescription& fontDescription )
319 bool IsScalable(const FontDescription& fontDescription);
322 * @copydoc Dali::TextAbstraction::FontClient::GetFixedSizes()
324 void GetFixedSizes(const FontPath& path, Dali::Vector<PointSize26Dot6>& sizes);
327 * @copydoc Dali::TextAbstraction::FontClient::GetFixedSizes()
329 void GetFixedSizes(const FontDescription& fontDescription,
330 Dali::Vector<PointSize26Dot6>& sizes);
333 * @copydoc Dali::TextAbstraction::FontClient::HasItalicStyle()
335 bool HasItalicStyle(FontId fontId) const;
338 * @copydoc Dali::TextAbstraction::FontClient::GetFontMetrics()
340 void GetFontMetrics(FontId fontId, FontMetrics& metrics);
343 * @copydoc Dali::TextAbstraction::FontClient::GetGlyphIndex()
345 GlyphIndex GetGlyphIndex(FontId fontId, Character charcode);
348 * @copydoc Dali::TextAbstraction::FontClient::GetGlyphMetrics()
350 bool GetGlyphMetrics(GlyphInfo* array, uint32_t size, GlyphType type, bool horizontal);
353 * Helper for GetGlyphMetrics when using bitmaps
355 bool GetBitmapMetrics(GlyphInfo* array, uint32_t size, bool horizontal);
358 * Helper for GetGlyphMetrics when using vectors
360 bool GetVectorMetrics(GlyphInfo* array, uint32_t size, bool horizontal);
363 * @copydoc Dali::TextAbstraction::FontClient::CreateBitmap( FontId fontId, GlyphIndex glyphIndex, bool isItalicRequired, bool isBoldRequired, Dali::TextAbstraction::FontClient::GlyphBufferData& data, int outlineWidth )
365 void CreateBitmap(FontId fontId, GlyphIndex glyphIndex, bool isItalicRequired, bool isBoldRequired, Dali::TextAbstraction::FontClient::GlyphBufferData& data, int outlineWidth);
368 * @copydoc Dali::TextAbstraction::FontClient::CreateBitmap( FontId fontId, GlyphIndex glyphIndex, int outlineWidth )
370 PixelData CreateBitmap(FontId fontId, GlyphIndex glyphIndex, int outlineWidth);
373 * @copydoc Dali::TextAbstraction::FontClient::CreateVectorBlob()
375 void CreateVectorBlob(FontId fontId, GlyphIndex glyphIndex, VectorBlob*& blob, unsigned int& blobLength, unsigned int& nominalWidth, unsigned int& nominalHeight);
378 * @copydoc Dali::TextAbstraction::FontClient::GetEllipsisGlyph()
380 const GlyphInfo& GetEllipsisGlyph(PointSize26Dot6 requestedPointSize);
383 * @copydoc Dali::TextAbstraction::FontClient::IsColorGlyph()
385 bool IsColorGlyph(FontId fontId, GlyphIndex glyphIndex);
388 * @copydoc Dali::TextAbstraction::FontClient::CreateEmbeddedItem()
390 GlyphIndex CreateEmbeddedItem(const TextAbstraction::FontClient::EmbeddedItemDescription& description, Pixel::Format& pixelFormat);
393 * @copydoc Dali::TextAbstraction::FontClient::EnableAtlasLimitation(bool enabled)
395 void EnableAtlasLimitation(bool enabled);
398 * @copydoc Dali::TextAbstraction::FontClient::IsAtlasLimitationEnabled()
400 bool IsAtlasLimitationEnabled() const;
403 * @copydoc Dali::TextAbstraction::FontClient::GetMaximumTextAtlasSize()
405 Size GetMaximumTextAtlasSize() const;
408 * @copydoc Dali::TextAbstraction::FontClient::GetDefaultTextAtlasSize()
410 Size GetDefaultTextAtlasSize() const;
413 * @copydoc Dali::TextAbstraction::FontClient::GetCurrentMaximumBlockSizeFitInAtlas()
415 Size GetCurrentMaximumBlockSizeFitInAtlas() const;
418 * @copydoc Dali::TextAbstraction::FontClient::SetCurrentMaximumBlockSizeFitInAtlas(const Size& currentMaximumBlockSizeFitInAtlas)
420 bool SetCurrentMaximumBlockSizeFitInAtlas(const Size& currentMaximumBlockSizeFitInAtlas);
423 * @copydoc Dali::TextAbstraction::FontClient::GetNumberOfPointsPerOneUnitOfPointSize()
425 uint32_t GetNumberOfPointsPerOneUnitOfPointSize() const;
428 * @copydoc Dali::TextAbstraction::Internal::FontClient::GetFreetypeFace()
430 FT_FaceRec_* GetFreetypeFace(FontId fontId);
433 * @copydoc Dali::TextAbstraction::Internal::FontClient::GetFontType()
435 FontDescription::Type GetFontType(FontId fontId);
438 * @copydoc Dali::TextAbstraction::FontClient::AddCustomFontDirectory()
440 bool AddCustomFontDirectory(const FontPath& path);
444 * @brief Caches the fonts present in the platform.
446 * Calls GetFcFontSet() to retrieve the fonts.
448 void InitSystemFonts();
451 * @brief Gets the FontDescription which matches the given pattern.
453 * @note The reference counter of the @p characterSet has been increased. Call FcCharSetDestroy to decrease it.
455 * @param[in] pattern pattern to match against.
456 * @param[out] fontDescription the resultant fontDescription that matched.
457 * @param[out] characterSet The character set for that pattern.
458 * @return true if match found.
460 bool MatchFontDescriptionToPattern(_FcPattern* pattern, Dali::TextAbstraction::FontDescription& fontDescription, _FcCharSet** characterSet);
463 * @brief Retrieves the fonts present in the platform.
465 * @note Need to call FcFontSetDestroy to free the allocated resources.
467 * @return A font fonfig data structure with the platform's fonts.
469 _FcFontSet* GetFcFontSet() const;
472 * @brief Retrieves a font config object's value from a pattern.
474 * @param[in] pattern The font config pattern.
475 * @param[in] n The object.
476 * @param[out] string The object's value.
478 * @return @e true if the operation is successful.
480 bool GetFcString(const _FcPattern* const pattern, const char* const n, std::string& string);
483 * @brief Retrieves a font config object's value from a pattern.
485 * @param[in] pattern The font config pattern.
486 * @param[in] n The object.
487 * @param[out] intVal The object's value.
489 * @return @e true if the operation is successful.
491 bool GetFcInt(const _FcPattern* const pattern, const char* const n, int& intVal);
494 * @brief Creates a font.
496 * @param[in] path The path to the font file name.
497 * @param[in] requestedPointSize The requested point size.
498 * @param[in] faceIndex A face index.
499 * @param[in] cacheDescription Whether to cache the font description.
501 * @return The font identifier.
503 FontId CreateFont(const FontPath& path,
504 PointSize26Dot6 requestedPointSize,
506 bool cacheDescription);
509 * @brief Finds in the cache if there is a triplet with the path to the font file name, the font point size and the face index.
510 * If there is one , if writes the font identifier in the param @p fontId.
512 * @param[in] path Path to the font file name.
513 * @param[in] requestedPointSize The font point size.
514 * @param[in] faceIndex The face index.
515 * @param[out] fontId The font identifier.
517 * @return @e true if there triplet is found.
519 bool FindFont(const FontPath& path, PointSize26Dot6 requestedPointSize, FaceIndex faceIndex, FontId& fontId) const;
522 * @brief Finds in the cache a cluster 'font family, font width, font weight, font slant'
523 * If there is one, it writes the index to the vector with font descriptions in the param @p validatedFontId.
525 * @param[in] fontDescription The font to validate.
526 * @param[out] validatedFontId The index to the vector with font descriptions.
528 * @return @e true if the pair is found.
530 bool FindValidatedFont(const FontDescription& fontDescription,
531 FontDescriptionId& validatedFontId);
534 * @brief Finds a fallback font list from the cache for a given font-description
536 * @param[in] fontDescription The font to validate.
537 * @param[out] A valid pointer to a font list, or @e nullptr if not found.
538 * @param[out] characterSetList A valid pointer to a character set list, or @e nullptr if not found.
540 bool FindFallbackFontList(const FontDescription& fontDescription,
542 CharacterSetList*& characterSetList);
545 * @brief Finds in the cache a pair 'validated font identifier and font point size'.
546 * If there is one it writes the font identifier in the param @p fontId.
548 * @param[in] validatedFontId Index to the vector with font descriptions.
549 * @param[in] requestedPointSize The font point size.
550 * @param[out] fontId The font identifier.
552 * @return @e true if the pair is found.
554 bool FindFont(FontDescriptionId validatedFontId,
555 PointSize26Dot6 requestedPointSize,
559 * @brief Finds in the cache a bitmap font with the @p bitmapFont family name.
561 * @param[in] bitmapFont The font's family name.
562 * @param[out] fontId The id of the font.
564 * @return Whether the font has been found.
566 bool FindBitmapFont(const FontFamily& bitmapFont, FontId& fontId) const;
569 * @brief Validate a font description.
571 * @param[in] fontDescription The font to validate.
572 * @param[out] validatedFontId Result of validation
574 void ValidateFont(const FontDescription& fontDescription,
575 FontDescriptionId& validatedFontId);
578 * @brief Helper for GetDefaultFonts etc.
580 * @note CharacterSetList is a vector of FcCharSet that are reference counted. It's needed to call FcCharSetDestroy to decrease the reference counter.
582 * @param[in] fontDescription A font description.
583 * @param[out] fontList A list of the fonts which are a close match for fontDescription.
584 * @param[out] characterSetList A list of character sets which are a close match for fontDescription.
586 void SetFontList(const FontDescription& fontDescription, FontList& fontList, CharacterSetList& characterSetList);
589 * Caches a font path.
591 * @param[in] ftFace The FreeType face.
592 * @param[in] id The font identifier.
593 * @param[in] requestedPointSize The font point size.
594 * @param[in] path Path to the font file name.
596 void CacheFontPath(FT_Face ftFace, FontId id, PointSize26Dot6 requestedPointSize, const FontPath& path);
599 * @brief Free the resources allocated in the fallback cache.
601 * @param[in] fallbackCache The fallback cache.
603 void ClearFallbackCache(std::vector<FallbackCacheItem>& fallbackCache);
606 * @brief Free the resources allocated by the FcCharSet objects.
608 void ClearCharacterSetFromFontFaceCache();
611 // Declared private and left undefined to avoid copies.
612 Plugin(const Plugin&);
613 // Declared private and left undefined to avoid copies.
614 Plugin& operator=(const Plugin&);
617 FT_Library mFreeTypeLibrary; ///< A handle to a FreeType library instance.
619 unsigned int mDpiHorizontal; ///< Horizontal dpi.
620 unsigned int mDpiVertical; ///< Vertical dpi.
622 FontDescription mDefaultFontDescription; ///< The cached default font from the system
624 FontList mSystemFonts; ///< Cached system fonts.
625 FontList mDefaultFonts; ///< Cached default fonts.
626 CharacterSetList mDefaultFontCharacterSets;
628 std::vector<FallbackCacheItem> mFallbackCache; ///< Cached fallback font lists.
630 Vector<FontIdCacheItem> mFontIdCache;
631 std::vector<FontFaceCacheItem> mFontFaceCache; ///< Caches the FreeType face and font metrics of the triplet 'path to the font file name, font point size and face index'.
632 std::vector<FontDescriptionCacheItem> mValidatedFontCache; ///< Caches indices to the vector of font descriptions for a given font.
633 FontList mFontDescriptionCache; ///< Caches font descriptions for the validated font.
634 CharacterSetList mCharacterSetCache; ///< Caches character set lists for the validated font.
635 std::vector<FontDescriptionSizeCacheItem> mFontDescriptionSizeCache; ///< Caches font identifiers for the pairs of font point size and the index to the vector with font descriptions of the validated fonts.
637 VectorFontCache* mVectorFontCache; ///< Separate cache for vector data blobs etc.
639 Vector<EllipsisItem> mEllipsisCache; ///< Caches ellipsis glyphs for a particular point size.
640 std::vector<PixelBufferCacheItem> mPixelBufferCache; ///< Caches the pixel buffer of a url.
641 Vector<EmbeddedItem> mEmbeddedItemCache; ///< Cache embedded items.
642 std::vector<BitmapFontCacheItem> mBitmapFontCache; ///< Stores bitmap fonts.
644 bool mDefaultFontDescriptionCached : 1; ///< Whether the default font is cached or not
646 bool mIsAtlasLimitationEnabled : 1; ///< Whether the validation on maximum atlas block size, then reduce block size to fit into it is enabled or not.
647 Vector2 mCurrentMaximumBlockSizeFitInAtlas; ///< The current maximum size (width, height) of text-atlas-block.
650 } // namespace Internal
652 } // namespace TextAbstraction
656 #endif // DALI_INTERNAL_TEXT_ABSTRACTION_FONT_CLIENT_PLUGIN_IMPL_H