3 * Copyright (c) 2022 Samsung Electronics Co., Ltd.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
20 #include <dali-toolkit/internal/text/glyph-metrics-helper.h>
23 #include <dali-toolkit/internal/text/rendering/styles/character-spacing-helper-functions.h>
31 Length GetNumberOfGlyphsOfGroup(GlyphIndex glyphIndex,
32 GlyphIndex lastGlyphPlusOne,
33 const Length* const charactersPerGlyphBuffer)
35 Length numberOfGLyphsInGroup = 1u;
37 for(GlyphIndex index = glyphIndex; index < lastGlyphPlusOne; ++index)
39 if(0u == *(charactersPerGlyphBuffer + index))
41 ++numberOfGLyphsInGroup;
49 return numberOfGLyphsInGroup;
52 void GetGlyphsMetrics(GlyphIndex glyphIndex,
53 Length numberOfGlyphs,
54 GlyphMetrics& glyphMetrics,
55 const GlyphInfo* const glyphsBuffer,
57 float calculatedAdvance)
59 const GlyphInfo& firstGlyph = *(glyphsBuffer + glyphIndex);
61 Text::FontMetrics fontMetrics;
62 if(0u != firstGlyph.fontId)
64 metrics->GetFontMetrics(firstGlyph.fontId, fontMetrics);
66 else if(0u != firstGlyph.index)
68 // It may be an embedded image.
69 fontMetrics.ascender = firstGlyph.height;
70 fontMetrics.descender = 0.f;
71 fontMetrics.height = fontMetrics.ascender;
74 const bool isItalicFont = metrics->HasItalicStyle(firstGlyph.fontId);
76 glyphMetrics.fontId = firstGlyph.fontId;
77 glyphMetrics.fontHeight = fontMetrics.height;
78 glyphMetrics.width = firstGlyph.width;
79 glyphMetrics.advance = calculatedAdvance;
80 glyphMetrics.ascender = fontMetrics.ascender;
81 glyphMetrics.xBearing = firstGlyph.xBearing;
83 if(1u < numberOfGlyphs)
85 float maxWidthEdge = firstGlyph.xBearing + firstGlyph.width;
87 for(unsigned int i = 1u; i < numberOfGlyphs; ++i)
89 const GlyphInfo& glyphInfo = *(glyphsBuffer + glyphIndex + i);
91 // update the initial xBearing if smaller.
92 glyphMetrics.xBearing = std::min(glyphMetrics.xBearing, glyphMetrics.advance + glyphInfo.xBearing);
94 // update the max width edge if bigger.
95 const float currentMaxGlyphWidthEdge = glyphMetrics.advance + glyphInfo.xBearing + glyphInfo.width;
96 maxWidthEdge = std::max(maxWidthEdge, currentMaxGlyphWidthEdge);
98 glyphMetrics.advance += (glyphInfo.advance);
101 glyphMetrics.width = maxWidthEdge - glyphMetrics.xBearing;
104 glyphMetrics.width += (firstGlyph.isItalicRequired && !isItalicFont) ? TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE * firstGlyph.height : 0.f;
107 void GetGlyphMetricsFromCharacterIndex(CharacterIndex index,
108 const VisualModelPtr& visualModel,
109 const LogicalModelPtr& logicalModel,
111 GlyphMetrics& glyphMetrics,
112 GlyphIndex& glyphIndex,
113 Length& numberOfGlyphs)
115 const GlyphIndex* const charactersToGlyphBuffer = visualModel->mCharactersToGlyph.Begin();
116 const Length* const glyphsPerCharacterBuffer = visualModel->mGlyphsPerCharacter.Begin();
117 const GlyphInfo* const glyphInfoBuffer = visualModel->mGlyphs.Begin();
118 Vector<CharacterIndex>& glyphToCharacterMap = visualModel->mGlyphsToCharacters;
119 const CharacterIndex* glyphToCharacterMapBuffer = glyphToCharacterMap.Begin();
120 const float modelCharacterSpacing = visualModel->GetCharacterSpacing();
122 // Get the character-spacing runs.
123 const Vector<CharacterSpacingGlyphRun>& characterSpacingGlyphRuns = visualModel->GetCharacterSpacingGlyphRuns();
125 //Takes the character index, obtains the glyph index (and the number of Glyphs) from it and finally gets the glyph metrics.
126 glyphIndex = *(charactersToGlyphBuffer + index);
127 numberOfGlyphs = *(glyphsPerCharacterBuffer + index);
129 float calculatedAdvance = 0.f;
131 const float characterSpacing = GetGlyphCharacterSpacing(glyphIndex, characterSpacingGlyphRuns, modelCharacterSpacing);
132 calculatedAdvance = GetCalculatedAdvance(*(logicalModel->mText.Begin() + (*(glyphToCharacterMapBuffer + glyphIndex))), characterSpacing, (*(visualModel->mGlyphs.Begin() + glyphIndex)).advance);
134 // Get the metrics for the group of glyphs.
135 GetGlyphsMetrics(glyphIndex,
143 float GetCalculatedAdvance(unsigned int character, float characterSpacing, float advance)
145 //Gets the final advance value by adding the CharacterSpacing value to it
146 //In some cases the CharacterSpacing should not be added. Ex: when the glyph is a ZWSP (Zero Width Space)
147 return (TextAbstraction::IsZeroWidthNonJoiner(character) || TextAbstraction::IsZeroWidthJoiner(character) ||
148 TextAbstraction::IsZeroWidthSpace(character) || TextAbstraction::IsNewParagraph(character) ||
149 TextAbstraction::IsLeftToRightMark(character) || TextAbstraction::IsRightToLeftMark(character))
151 : advance + characterSpacing;
156 } // namespace Toolkit