[Tizen] Fix emoji vertical alignment issue

This patch uses ascender, descender, yBearing of font metrics to ensure that
the emoji is placed on the proper baseline when it is with a plain text glyphs.

Change-Id: I9b80e84820299c95da824eac286b98dbc40ed014
Signed-off-by: Bowon Ryu <bowon.ryu@samsung.com>

diff --git a/dali/internal/text/text-abstraction/plugin/font-client-plugin-impl.cpp b/dali/internal/text/text-abstraction/plugin/font-client-plugin-impl.cpp
index 40d3f32..5668718 100644 (file)
--- a/dali/internal/text/text-abstraction/plugin/font-client-plugin-impl.cpp
+++ b/dali/internal/text/text-abstraction/plugin/font-client-plugin-impl.cpp
@@ -1567,16 +1567,17 @@ FontId FontClient::Plugin::CreateFont(const FontPath& path,
       }
       else
       {
+        FT_Size_Metrics& ftMetrics = ftFace->size->metrics;
+
+        FontMetrics metrics(static_cast<float>(ftMetrics.ascender) * FROM_266,
+                            static_cast<float>(ftMetrics.descender) * FROM_266,
+                            static_cast<float>(ftMetrics.height) * FROM_266,
+                            static_cast<float>(ftFace->underline_position) * FROM_266,
+                            static_cast<float>(ftFace->underline_thickness) * FROM_266);
+
         const float fixedWidth  = static_cast<float>(ftFace->available_sizes[fixedSizeIndex].width);
         const float fixedHeight = static_cast<float>(ftFace->available_sizes[fixedSizeIndex].height);
 
-        // Indicate that the font is a fixed sized bitmap
-        FontMetrics metrics(fixedHeight, // The ascender in pixels.
-                            0.0f,
-                            fixedHeight, // The height in pixels.
-                            0.0f,
-                            0.0f);
-
         // Create the FreeType font face item to cache.
         FontFaceCacheItem fontFaceCacheItem(mFreeTypeLibrary, ftFace, path, requestedPointSize, faceIndex, metrics, fixedSizeIndex, fixedWidth, fixedHeight, hasColorTables);
 

diff --git a/dali/internal/text/text-abstraction/plugin/font-face-cache-item.cpp b/dali/internal/text/text-abstraction/plugin/font-face-cache-item.cpp
index 894500e..92a1ff2 100644 (file)
--- a/dali/internal/text/text-abstraction/plugin/font-face-cache-item.cpp
+++ b/dali/internal/text/text-abstraction/plugin/font-face-cache-item.cpp
@@ -90,9 +90,9 @@ void FontFaceCacheItem::GetFontMetrics(FontMetrics& metrics, unsigned int dpiVer
     {
       const float scaleFactor = desiredFixedSize / mFixedHeightPixels;
 
-      metrics.ascender           = metrics.ascender * scaleFactor;
-      metrics.descender          = metrics.descender * scaleFactor;
-      metrics.height             = metrics.height * scaleFactor;
+      metrics.ascender           = round(metrics.ascender * scaleFactor);
+      metrics.descender          = round(metrics.descender * scaleFactor);
+      metrics.height             = round(metrics.height * scaleFactor);
       metrics.underlinePosition  = metrics.underlinePosition * scaleFactor;
       metrics.underlineThickness = metrics.underlineThickness * scaleFactor;
     }
@@ -117,7 +117,15 @@ bool FontFaceCacheItem::GetGlyphMetrics(GlyphInfo& glyph, unsigned int dpiVertic
       glyph.height   = mFixedHeightPixels;
       glyph.advance  = mFixedWidthPixels;
       glyph.xBearing = 0.0f;
-      glyph.yBearing = mFixedHeightPixels;
+
+      if(horizontal)
+      {
+        glyph.yBearing += static_cast<float>(ftFace->glyph->metrics.horiBearingY) * FROM_266;
+      }
+      else
+      {
+        glyph.yBearing += static_cast<float>(ftFace->glyph->metrics.vertBearingY) * FROM_266;
+      }
 
       // Adjust the metrics if the fixed-size font should be down-scaled
       const float desiredFixedSize = static_cast<float>(mRequestedPointSize) * FROM_266 / POINTS_PER_INCH * dpiVertical;
@@ -125,12 +133,11 @@ bool FontFaceCacheItem::GetGlyphMetrics(GlyphInfo& glyph, unsigned int dpiVertic
       if(desiredFixedSize > 0.f)
       {
         const float scaleFactor = desiredFixedSize / mFixedHeightPixels;
-
-        glyph.width    = glyph.width * scaleFactor;
-        glyph.height   = glyph.height * scaleFactor;
-        glyph.advance  = glyph.advance * scaleFactor;
-        glyph.xBearing = glyph.xBearing * scaleFactor;
-        glyph.yBearing = glyph.yBearing * scaleFactor;
+        glyph.width             = round(glyph.width * scaleFactor);
+        glyph.height            = round(glyph.height * scaleFactor);
+        glyph.advance           = round(glyph.advance * scaleFactor);
+        glyph.xBearing          = round(glyph.xBearing * scaleFactor);
+        glyph.yBearing          = round(glyph.yBearing * scaleFactor);
 
         glyph.scaleFactor = scaleFactor;
       }