[dali_2.3.20] Merge branch 'devel/master'
[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / text / rendering / styles / character-spacing-helper-functions.cpp
1 /*
2  * Copyright (c) 2022 Samsung Electronics Co., Ltd.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17
18 // CLASS HEADER
19 #include <dali-toolkit/internal/text/rendering/styles/character-spacing-helper-functions.h>
20
21 namespace Dali
22 {
23 namespace Toolkit
24 {
25 namespace Text
26 {
27 namespace
28 {
29 static const Vector<CharacterSpacingGlyphRun> EMPTY_CHARACTER_SPACING_GLYPH_RUNS;
30 }
31 float GetGlyphCharacterSpacing(const GlyphIndex&                       index,
32                                const Vector<CharacterSpacingGlyphRun>& characterSpacingGlyphRuns,
33                                const float                             modelCharacterSpacing)
34 {
35   float characterSpacing = modelCharacterSpacing;
36   for(Vector<CharacterSpacingGlyphRun>::ConstIterator it    = characterSpacingGlyphRuns.Begin(),
37                                                       endIt = characterSpacingGlyphRuns.End();
38       it != endIt;
39       ++it)
40   {
41     const CharacterSpacingGlyphRun& run = *it;
42
43     if((run.glyphRun.glyphIndex <= index) && (index < run.glyphRun.glyphIndex + run.glyphRun.numberOfGlyphs))
44     {
45       // Retrieve the latest run to handle the nested case.
46       //TODO: Using reverse Iterator will improve performance in this loop
47       characterSpacing = run.value;
48     }
49   }
50
51   return characterSpacing;
52 }
53
54 const Vector<CharacterSpacingGlyphRun>& GetEmptyCharacterSpacingGlyphRuns()
55 {
56   // This is needed to return a common empty vector for CharacterSpacingGlyphRun
57   return EMPTY_CHARACTER_SPACING_GLYPH_RUNS;
58 }
59 } // namespace Text
60
61 } // namespace Toolkit
62
63 } // namespace Dali