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speed up text rendering - perform full text layout only for complex text

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This commit is contained in:
Dmitry Batrak
2015-11-24 13:44:37 +03:00
parent 60157df657
commit 32f2ed3e90
1 changed files with 15 additions and 1 deletions
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platform/platform-impl/src/com/intellij/openapi/editor/impl/view/FontLayoutService.java
+15 -1
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@@ -22,6 +22,7 @@ import org.jetbrains.annotations.TestOnly;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.util.Arrays;
/**
* Encapsulates logic related to font metrics. Mock instance can be used in tests to make them independent on font properties on particular
@@ -55,7 +56,20 @@ public abstract class FontLayoutService {
@Override
public GlyphVector layoutGlyphVector(@NotNull Font font, @NotNull FontRenderContext fontRenderContext,
@NotNull char[] chars, int start, int end, boolean isRtl) {
return font.layoutGlyphVector(fontRenderContext, chars, start, end, isRtl ? Font.LAYOUT_RIGHT_TO_LEFT : Font.LAYOUT_LEFT_TO_RIGHT);
if (isRtl || font.hasLayoutAttributes() || isComplexText(chars, start, end)) {
return font.layoutGlyphVector(fontRenderContext, chars, start, end, isRtl ? Font.LAYOUT_RIGHT_TO_LEFT : Font.LAYOUT_LEFT_TO_RIGHT);
}
else {
return font.createGlyphVector(fontRenderContext, Arrays.copyOfRange(chars, start, end));
}
}
// a simplified version of sun.font.FontUtilities.isComplexText
private static boolean isComplexText(char[] chars, int start, int end) {
for (int i = start; i < end; i++) {
if (chars[i] >= 0x0300) return true;
}
return false;
}
@Override