dali-toolkit/internal/text/rendering/styles/strikethrough-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/strikethrough-helper-functions.h>
  20
  21 namespace Dali
  22 {
  23 namespace Toolkit
  24 {
  25 namespace Text
  26 {
  27 bool IsGlyphStrikethrough(GlyphIndex                                    index,
  28                           const Vector<StrikethroughGlyphRun>&          strikethroughRuns,
  29                           Vector<StrikethroughGlyphRun>::ConstIterator& currentStrikethroughGlyphRunIt)
  30 {
  31   for(Vector<StrikethroughGlyphRun>::ConstIterator it    = strikethroughRuns.Begin(),
  32                                                    endIt = strikethroughRuns.End();
  33       it != endIt;
  34       ++it)
  35   {
  36     const StrikethroughGlyphRun& run = *it;
  37
  38     if((run.glyphRun.glyphIndex <= index) && (index < run.glyphRun.glyphIndex + run.glyphRun.numberOfGlyphs))
  39     {
  40       currentStrikethroughGlyphRunIt = it;
  41       return true;
  42     }
  43   }
  44
  45   return false;
  46 }
  47
  48 float GetCurrentStrikethroughHeight(const Vector<StrikethroughGlyphRun>&         strikethroughRuns,
  49                                     Vector<StrikethroughGlyphRun>::ConstIterator currentStrikethroughGlyphRunIt,
  50                                     const float                                  strikethroughHeight)
  51 {
  52   if(currentStrikethroughGlyphRunIt == strikethroughRuns.End())
  53   {
  54     return strikethroughHeight;
  55   }
  56
  57   const StrikethroughGlyphRun& strikethroughGlyphRun = *currentStrikethroughGlyphRunIt;
  58   return (strikethroughGlyphRun.properties.heightDefined ? strikethroughGlyphRun.properties.height : strikethroughHeight);
  59 }
  60
  61 StrikethroughStyleProperties GetCurrentStrikethroughProperties(const bool&                                  isGlyphStrikethrough,
  62                                                                const Vector<StrikethroughGlyphRun>&         strikethroughRuns,
  63                                                                Vector<StrikethroughGlyphRun>::ConstIterator currentStrikethroughGlyphRunIt,
  64                                                                const StrikethroughStyleProperties&          commonStrikethroughProperties)
  65 {
  66   return (isGlyphStrikethrough && (currentStrikethroughGlyphRunIt != strikethroughRuns.End()))
  67            ? currentStrikethroughGlyphRunIt->properties
  68            : commonStrikethroughProperties;
  69 }
  70
  71 /// Helper method to fetch the strikethrough metrics for the specified font glyph
  72 void CalcualteStrikethroughHeight(float& currentStrikethroughHeight, float& maxStrikethroughHeight)
  73 {
  74   //Height of strikethrough represents the thickness of line.
  75
  76   // Ensure strikethrough will be at least a pixel high
  77   if(currentStrikethroughHeight < 1.0f)
  78   {
  79     currentStrikethroughHeight = 1.0f;
  80   }
  81   else
  82   {
  83     currentStrikethroughHeight = ceil(currentStrikethroughHeight);
  84   }
  85
  86   // The strikethrough height should be the max strikethrough height of all glyphs of the line.
  87   if(currentStrikethroughHeight > maxStrikethroughHeight)
  88   {
  89     maxStrikethroughHeight = currentStrikethroughHeight;
  90   }
  91 }
  92
  93 } // namespace Text
  94
  95 } // namespace Toolkit
  96
  97 } // namespace Dali