105 lines
4.1 KiB
C++
105 lines
4.1 KiB
C++
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// Copyright Epic Games, Inc. All Rights Reserved.
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#include "ThumbnailRendering/FontThumbnailRenderer.h"
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#include "Fonts/SlateFontInfo.h"
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#include "Fonts/FontCache.h"
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#include "Framework/Application/SlateApplication.h"
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#include "Engine/Font.h"
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#include "CanvasItem.h"
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#include "Engine/Texture2D.h"
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#include "CanvasTypes.h"
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UFontThumbnailRenderer::UFontThumbnailRenderer(const FObjectInitializer& ObjectInitializer)
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: Super(ObjectInitializer)
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{
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}
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void UFontThumbnailRenderer::GetThumbnailSize(UObject* Object, float Zoom, uint32& OutWidth, uint32& OutHeight) const
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{
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UFont* const Font = Cast<UFont>(Object);
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if (Font)
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{
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switch (Font->FontCacheType)
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{
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case EFontCacheType::Offline:
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if (Font->Textures.Num() > 0 && Font->Textures[0])
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{
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// Get the texture interface for the font text
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UTexture2D* const Tex = Font->Textures[0];
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OutWidth = FMath::TruncToInt(Zoom * (float)Tex->GetSurfaceWidth());
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OutHeight = FMath::TruncToInt(Zoom * (float)Tex->GetSurfaceHeight());
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return;
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}
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break;
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case EFontCacheType::Runtime:
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if (Font->CompositeFont.DefaultTypeface.Fonts.Num() > 0)
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{
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OutWidth = OutHeight = Zoom * 256.0f;
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}
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break;
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default:
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break;
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};
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}
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OutWidth = OutHeight = 0;
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}
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void UFontThumbnailRenderer::Draw(UObject* Object, int32 X, int32 Y, uint32 Width, uint32 Height, FRenderTarget*, FCanvas* Canvas, bool bAdditionalViewFamily)
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{
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UFont* const Font = Cast<UFont>(Object);
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if (Font)
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{
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switch (Font->FontCacheType)
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{
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case EFontCacheType::Offline:
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if (Font->Textures.Num() > 0 && Font->Textures[0])
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{
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FCanvasTileItem TileItem(FVector2D(X, Y), Font->Textures[0]->Resource, FLinearColor::White);
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TileItem.BlendMode = (Font->ImportOptions.bUseDistanceFieldAlpha) ? SE_BLEND_TranslucentDistanceField : SE_BLEND_Translucent;
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Canvas->DrawItem(TileItem);
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}
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break;
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case EFontCacheType::Runtime:
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if (Font->CompositeFont.DefaultTypeface.Fonts.Num() > 0)
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{
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static const int32 FontSize = 28;
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static const float FontScale = 1.0f;
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const FString FontName = Object->GetName();
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const TextBiDi::ETextDirection FontNameBaseTextDirection = TextBiDi::ComputeBaseDirection(FontName);
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TSharedRef<FSlateFontCache> FontCache = FSlateApplication::Get().GetRenderer()->GetFontCache();
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// Draw the object name using each of the default fonts
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FVector2D CurPos(X, Y);
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for (const FTypefaceEntry& TypefaceEntry: Font->CompositeFont.DefaultTypeface.Fonts)
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{
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FSlateFontInfo FontInfo(Font, FontSize, TypefaceEntry.Name);
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FShapedGlyphSequenceRef FontNameShapedText = FontCache->ShapeBidirectionalText(FontName, FontInfo, FontScale, FontNameBaseTextDirection, ETextShapingMethod::Auto);
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FVector2D TextDrawPos = CurPos;
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if (FontNameBaseTextDirection == TextBiDi::ETextDirection::RightToLeft)
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{
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TextDrawPos.X = Width - CurPos.X - FontNameShapedText->GetMeasuredWidth();
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}
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FCanvasShapedTextItem TextItem(TextDrawPos, FontNameShapedText, FLinearColor::White);
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Canvas->DrawItem(TextItem);
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CurPos.Y += FontNameShapedText->GetMaxTextHeight();
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}
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}
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break;
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default:
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break;
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};
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}
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}
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