[dali_2.1.3] Merge branch 'devel/master'

[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / text / glyph-metrics-helper.cpp

diff --git a/dali-toolkit/internal/text/glyph-metrics-helper.cpp b/dali-toolkit/internal/text/glyph-metrics-helper.cpp
index 9c7c8ec..f87555e 100644 (file)
--- a/dali-toolkit/internal/text/glyph-metrics-helper.cpp
+++ b/dali-toolkit/internal/text/glyph-metrics-helper.cpp
@@ -1,6 +1,6 @@
 
 /*
- * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2021 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,22 +21,19 @@
 
 namespace Dali
 {
-
 namespace Toolkit
 {
-
 namespace Text
 {
-
-Length GetNumberOfGlyphsOfGroup( GlyphIndex glyphIndex,
-                                 GlyphIndex lastGlyphPlusOne,
-                                 const Length* const charactersPerGlyphBuffer )
+Length GetNumberOfGlyphsOfGroup(GlyphIndex          glyphIndex,
+                                GlyphIndex          lastGlyphPlusOne,
+                                const Length* const charactersPerGlyphBuffer)
 {
   Length numberOfGLyphsInGroup = 1u;
 
-  for( GlyphIndex index = glyphIndex; index < lastGlyphPlusOne; ++index )
+  for(GlyphIndex index = glyphIndex; index < lastGlyphPlusOne; ++index)
   {
-    if( 0u == *( charactersPerGlyphBuffer + index ) )
+    if(0u == *(charactersPerGlyphBuffer + index))
     {
       ++numberOfGLyphsInGroup;
     }
@@ -49,31 +46,72 @@ Length GetNumberOfGlyphsOfGroup( GlyphIndex glyphIndex,
   return numberOfGLyphsInGroup;
 }
 
-void GetGlyphsMetrics( GlyphIndex glyphIndex,
-                       Length numberOfGlyphs,
-                       GlyphMetrics& glyphMetrics,
-                       const GlyphInfo* const glyphsBuffer,
-                       MetricsPtr& metrics )
+void GetGlyphsMetrics(GlyphIndex             glyphIndex,
+                      Length                 numberOfGlyphs,
+                      GlyphMetrics&          glyphMetrics,
+                      const GlyphInfo* const glyphsBuffer,
+                      MetricsPtr&            metrics)
 {
-  const GlyphInfo& firstGlyph = *( glyphsBuffer + glyphIndex );
+  const GlyphInfo& firstGlyph = *(glyphsBuffer + glyphIndex);
 
   Text::FontMetrics fontMetrics;
-  metrics->GetFontMetrics( firstGlyph.fontId, fontMetrics );
+  if(0u != firstGlyph.fontId)
+  {
+    metrics->GetFontMetrics(firstGlyph.fontId, fontMetrics);
+  }
+  else if(0u != firstGlyph.index)
+  {
+    // It may be an embedded image.
+    fontMetrics.ascender  = firstGlyph.height;
+    fontMetrics.descender = 0.f;
+    fontMetrics.height    = fontMetrics.ascender;
+  }
 
-  glyphMetrics.fontId = firstGlyph.fontId;
+  const bool isItalicFont = metrics->HasItalicStyle(firstGlyph.fontId);
+
+  glyphMetrics.fontId     = firstGlyph.fontId;
   glyphMetrics.fontHeight = fontMetrics.height;
-  glyphMetrics.width = firstGlyph.width;
-  glyphMetrics.advance = firstGlyph.advance;
-  glyphMetrics.ascender = fontMetrics.ascender;
-  glyphMetrics.xBearing = firstGlyph.xBearing;
+  glyphMetrics.width      = firstGlyph.width;
+  glyphMetrics.advance    = firstGlyph.advance;
+  glyphMetrics.ascender   = fontMetrics.ascender;
+  glyphMetrics.xBearing   = firstGlyph.xBearing;
 
-  for( unsigned int i = 1u; i < numberOfGlyphs; ++i )
+  if(1u < numberOfGlyphs)
   {
-    const GlyphInfo& glyphInfo = *( glyphsBuffer + glyphIndex + i );
+    float maxWidthEdge = firstGlyph.xBearing + firstGlyph.width;
+
+    for(unsigned int i = 1u; i < numberOfGlyphs; ++i)
+    {
+      const GlyphInfo& glyphInfo = *(glyphsBuffer + glyphIndex + i);
+
+      // update the initial xBearing if smaller.
+      glyphMetrics.xBearing = std::min(glyphMetrics.xBearing, glyphMetrics.advance + glyphInfo.xBearing);
+
+      // update the max width edge if bigger.
+      const float currentMaxGlyphWidthEdge = glyphMetrics.advance + glyphInfo.xBearing + glyphInfo.width;
+      maxWidthEdge                         = std::max(maxWidthEdge, currentMaxGlyphWidthEdge);
+
+      glyphMetrics.advance += glyphInfo.advance;
+    }
 
-    glyphMetrics.advance += glyphInfo.advance;
-    glyphMetrics.width += glyphInfo.width;
+    glyphMetrics.width = maxWidthEdge - glyphMetrics.xBearing;
   }
+
+  glyphMetrics.width += (firstGlyph.isItalicRequired && !isItalicFont) ? TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE * firstGlyph.height : 0.f;
+}
+
+void GetGlyphMetricsFromCharacterIndex(CharacterIndex index, const GlyphInfo* const glyphInfoBuffer, const GlyphIndex* const charactersToGlyphBuffer, const Length* const glyphsPerCharacterBuffer, MetricsPtr& metrics, GlyphMetrics& glyphMetrics, GlyphIndex& glyphIndex, Length& numberOfGlyphs)
+{
+  //Takes the character index, obtains the glyph index (and the number of Glyphs) from it and finally gets the glyph metrics.
+  glyphIndex     = *(charactersToGlyphBuffer + index);
+  numberOfGlyphs = *(glyphsPerCharacterBuffer + index);
+
+  // Get the metrics for the group of glyphs.
+  GetGlyphsMetrics(glyphIndex,
+                   numberOfGlyphs,
+                   glyphMetrics,
+                   glyphInfoBuffer,
+                   metrics);
 }
 
 } // namespace Text