/*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2017 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.
// Get the script for the current character.
Script script = GetScript( index,
- scriptRunIt,
- scriptRunEndIt );
+ scriptRunIt,
+ scriptRunEndIt );
#ifdef DEBUG_ENABLED
{
description.path.c_str() );
}
#endif
- if (script == TextAbstraction::UNKNOWN)
+ if( script == TextAbstraction::UNKNOWN )
{
script = TextAbstraction::LATIN;
}
// Check first in the cache of default fonts per script and size.
- DefaultFonts* defaultFonts = *( defaultFontPerScriptCacheBuffer + script );
FontId cachedDefaultFontId = 0u;
+ DefaultFonts* defaultFonts = *( defaultFontPerScriptCacheBuffer + script );
if( NULL != defaultFonts )
{
+ // This cache stores fall-back fonts.
cachedDefaultFontId = defaultFonts->FindFont( fontClient,
currentFontDescription,
currentFontPointSize );
// The font is valid if it matches with the default one for the current script and size and it's different than zero.
isValidFont = isValidCachedDefaultFont && ( fontId == cachedDefaultFontId );
+ if( isValidFont )
+ {
+ // Check if the font supports the character.
+ isValidFont = fontClient.IsCharacterSupportedByFont( fontId, character );
+ }
+
bool isCommonScript = false;
bool isEmojiScript = TextAbstraction::EMOJI == script;
currentFontRun.fontId = fontId;
}
-
// If the given font is not valid, it means either:
// - there is no cached font for the current script yet or,
// - the user has set a different font than the default one for the current script or,
// At this point the character common for all scripts has no font assigned.
// If there is a valid previously cached default font for it, use that one.
fontId = cachedDefaultFontId;
- isValidFont = true;
}
}
else
if( NULL != validateFontsPerScript )
{
+ // This cache stores valid fonts set by the user.
isValidFont = validateFontsPerScript->IsValidFont( fontId );
+
+ // It may happen that a validated font for a script doesn't have all the glyphs for that script.
+ // i.e a font validated for the CJK script may contain glyphs for the chinese language but not for the Japanese.
+ if( isValidFont )
+ {
+ // Checks if the current character is supported by the font is needed.
+ isValidFont = fontClient.IsCharacterSupportedByFont( fontId, character );
+ }
}
if( !isValidFont ) // (2)
{
- // Use the font client to validate the font.
- const GlyphIndex glyphIndex = fontClient.GetGlyphIndex( fontId, character );
+ // The selected font is not stored in any cache.
- // The font is valid if there is a glyph for that character.
- isValidFont = 0u != glyphIndex;
+ // Checks if the current character is supported by the selected font.
+ isValidFont = fontClient.IsCharacterSupportedByFont( fontId, character );
// Emojis are present in many monochrome fonts; prefer color by default.
if( isValidFont &&
isEmojiScript )
{
+ const GlyphIndex glyphIndex = fontClient.GetGlyphIndex( fontId, character );
+
// For color emojis, the font is valid if the glyph is a color glyph (the bitmap is RGBA).
isValidFont = fontClient.IsColorGlyph( fontId, glyphIndex );
}
validateFontsPerScript->mValidFonts.PushBack( fontId );
}
- if( !isValidFont ) // (3)
+ if( !isValidFont && ( fontId != cachedDefaultFontId ) ) // (3)
{
- // The given font has not been validated.
+ // The selected font by the user or the platform's default font has failed to validate the character.
+ // Checks if the previously discarted cached default font supports the character.
+ bool isValidCachedFont = false;
if( isValidCachedDefaultFont )
{
+ isValidCachedFont = fontClient.IsCharacterSupportedByFont( cachedDefaultFontId, character );
+ }
+
+ if( isValidCachedFont )
+ {
// Use the cached default font for the script if there is one.
fontId = cachedDefaultFontId;
}