Add font fallback
Note: All the `First()` in the code are temperary workarounds to make it work and require refractoring
This commit is contained in:
ExMatics HydrogenC
@@ -283,6 +283,206 @@ void Font::ProcessText(const StringView& text, Array<FontLineCache>& outputLines
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}
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}
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void Font::ProcessText(const Array<Font*>& fonts, const StringView& text, Array<FontLineCache>& outputLines, API_PARAM(Ref) const TextLayoutOptions& layout)
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{
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float cursorX = 0;
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int32 kerning;
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FontLineCache tmpLine;
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FontCharacterEntry entry;
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FontCharacterEntry previous;
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int32 textLength = text.Length();
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float scale = layout.Scale / FontManager::FontScale;
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float boundsWidth = layout.Bounds.GetWidth();
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float baseLinesDistanceScale = layout.BaseLinesGapScale * scale;
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tmpLine.Location = Float2::Zero;
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tmpLine.Size = Float2::Zero;
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tmpLine.FirstCharIndex = 0;
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tmpLine.LastCharIndex = -1;
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int32 lastWrapCharIndex = INVALID_INDEX;
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float lastWrapCharX = 0;
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bool lastMoveLine = false;
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int32 previousFontIndex = -1;
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// The maximum font height of the current line
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float maxHeight = 0;
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// Process each character to split text into single lines
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for (int32 currentIndex = 0; currentIndex < textLength;)
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{
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bool moveLine = false;
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float xAdvance = 0;
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int32 nextCharIndex = currentIndex + 1;
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// Cache current character
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const Char currentChar = text[currentIndex];
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const bool isWhitespace = StringUtils::IsWhitespace(currentChar);
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// Check if character can wrap words
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const bool isWrapChar = !StringUtils::IsAlnum(currentChar) || isWhitespace || StringUtils::IsUpper(currentChar);
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if (isWrapChar && currentIndex != 0)
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{
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lastWrapCharIndex = currentIndex;
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lastWrapCharX = cursorX;
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}
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// Check if it's a newline character
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if (currentChar == '\n')
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{
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// Break line
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moveLine = true;
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currentIndex++;
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tmpLine.LastCharIndex++;
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}
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else
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{
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// Get character entry
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int32 fontIndex = 0;
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while (fontIndex < fonts.Count() && !fonts[fontIndex]->ContainsChar(currentChar))
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{
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fontIndex++;
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}
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// If no font can match the char, then use the first font
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if (fontIndex == fonts.Count()) {
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fontIndex = 0;
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}
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// Get character entry
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fonts[fontIndex]->GetCharacter(currentChar, entry);
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maxHeight = Math::Max(maxHeight, static_cast<float>(fonts[fontIndex]->GetHeight()));
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// Get kerning, only when the font hasn't changed
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if (!isWhitespace && previous.IsValid && previousFontIndex == fontIndex)
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{
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kerning = fonts[fontIndex]->GetKerning(previous.Character, entry.Character);
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}
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else
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{
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kerning = 0;
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}
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previous = entry;
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previousFontIndex = fontIndex;
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xAdvance = (kerning + entry.AdvanceX) * scale;
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// Check if character fits the line or skip wrapping
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if (cursorX + xAdvance <= boundsWidth || layout.TextWrapping == TextWrapping::NoWrap)
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{
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// Move character
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cursorX += xAdvance;
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tmpLine.LastCharIndex++;
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}
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else if (layout.TextWrapping == TextWrapping::WrapWords)
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{
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if (lastWrapCharIndex != INVALID_INDEX)
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{
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// Skip moving twice for the same character
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int32 lastLineLasCharIndex = outputLines.HasItems() ? outputLines.Last().LastCharIndex : -10000;
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if (lastLineLasCharIndex == lastWrapCharIndex || lastLineLasCharIndex == lastWrapCharIndex - 1 || lastLineLasCharIndex == lastWrapCharIndex - 2)
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{
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currentIndex = nextCharIndex;
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lastMoveLine = moveLine;
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continue;
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}
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// Move line
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const Char wrapChar = text[lastWrapCharIndex];
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moveLine = true;
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cursorX = lastWrapCharX;
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if (StringUtils::IsWhitespace(wrapChar))
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{
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// Skip whitespaces
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tmpLine.LastCharIndex = lastWrapCharIndex - 1;
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nextCharIndex = currentIndex = lastWrapCharIndex + 1;
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}
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else
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{
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tmpLine.LastCharIndex = lastWrapCharIndex - 1;
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nextCharIndex = currentIndex = lastWrapCharIndex;
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}
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}
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}
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else if (layout.TextWrapping == TextWrapping::WrapChars)
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{
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// Move line
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moveLine = true;
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nextCharIndex = currentIndex;
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// Skip moving twice for the same character
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if (lastMoveLine)
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break;
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}
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}
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// Check if move to another line
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if (moveLine)
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{
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// Add line
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tmpLine.Size.X = cursorX;
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tmpLine.Size.Y = baseLinesDistanceScale * maxHeight;
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tmpLine.LastCharIndex = Math::Max(tmpLine.LastCharIndex, tmpLine.FirstCharIndex);
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outputLines.Add(tmpLine);
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// Reset line
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tmpLine.Location.Y += baseLinesDistanceScale * maxHeight;
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tmpLine.FirstCharIndex = currentIndex;
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tmpLine.LastCharIndex = currentIndex - 1;
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cursorX = 0;
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lastWrapCharIndex = INVALID_INDEX;
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lastWrapCharX = 0;
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previous.IsValid = false;
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// Reset max font height
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maxHeight = 0;
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}
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currentIndex = nextCharIndex;
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lastMoveLine = moveLine;
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}
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if (textLength != 0 && (tmpLine.LastCharIndex >= tmpLine.FirstCharIndex || text[textLength - 1] == '\n'))
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{
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// Add line
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tmpLine.Size.X = cursorX;
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tmpLine.Size.Y = baseLinesDistanceScale * maxHeight;
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tmpLine.LastCharIndex = textLength - 1;
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outputLines.Add(tmpLine);
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tmpLine.Location.Y += baseLinesDistanceScale * maxHeight;
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}
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// Check amount of lines
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if (outputLines.IsEmpty())
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return;
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float totalHeight = tmpLine.Location.Y;
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Float2 offset = Float2::Zero;
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if (layout.VerticalAlignment == TextAlignment::Center)
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{
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offset.Y += (layout.Bounds.GetHeight() - totalHeight) * 0.5f;
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}
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else if (layout.VerticalAlignment == TextAlignment::Far)
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{
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offset.Y += layout.Bounds.GetHeight() - totalHeight;
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}
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for (int32 i = 0; i < outputLines.Count(); i++)
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{
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FontLineCache& line = outputLines[i];
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Float2 rootPos = line.Location + offset;
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// Fix upper left line corner to match desire text alignment
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if (layout.HorizontalAlignment == TextAlignment::Center)
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{
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rootPos.X += (layout.Bounds.GetWidth() - line.Size.X) * 0.5f;
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}
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else if (layout.HorizontalAlignment == TextAlignment::Far)
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{
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rootPos.X += layout.Bounds.GetWidth() - line.Size.X;
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}
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line.Location = rootPos;
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}
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}
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Float2 Font::MeasureText(const StringView& text, const TextLayoutOptions& layout)
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{
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// Check if there is no need to do anything
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@@ -432,6 +632,11 @@ Float2 Font::GetCharPosition(const StringView& text, int32 index, const TextLayo
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return rootOffset + Float2(lines.Last().Size.X, static_cast<float>((lines.Count() - 1) * baseLinesDistance));
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}
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bool Font::ContainsChar(Char c)
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{
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return FT_Get_Char_Index(GetAsset()->GetFTFace(), c) > 0;
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}
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void Font::FlushFaceSize() const
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{
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// Set the character size
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