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Switched to FTransform2D when processing ImGui output before rendering it in Slate. This allows for more flexibility when transforming that data. Changed interface of FImGuiDrawList to enforce consistent transformation of vertices and clipping rectangle.

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This commit is contained in:
Sebastian 2018-04-17 20:28:29 +01:00
parent 2ccd3252ec
commit f8e689561f
4 changed files with 30 additions and 19 deletions
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14
Source/ImGui/Private/ImGuiDrawData.cpp
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@ -6,9 +6,9 @@
#if WITH_OBSOLETE_CLIPPING_API
void FImGuiDrawList::CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FVector2D VertexPositionOffset, const FSlateRotatedRect& VertexClippingRect) const
void FImGuiDrawList::CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FTransform2D& Transform, const FSlateRotatedRect& VertexClippingRect) const
#else
void FImGuiDrawList::CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FVector2D VertexPositionOffset) const
void FImGuiDrawList::CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FTransform2D& Transform) const
#endif // WITH_OBSOLETE_CLIPPING_API
{
// Reset and reserve space in destination buffer.
@ -25,13 +25,13 @@ void FImGuiDrawList::CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const
SlateVertex.TexCoords[1] = ImGuiVertex.uv.y;
SlateVertex.TexCoords[2] = SlateVertex.TexCoords[3] = 1.f;
// Copy ImGui position and add offset.
SlateVertex.Position[0] = ImGuiVertex.pos.x + VertexPositionOffset.X;
SlateVertex.Position[1] = ImGuiVertex.pos.y + VertexPositionOffset.Y;
#if WITH_OBSOLETE_CLIPPING_API
// Set clipping rectangle.
const FVector2D VertexPosition = Transform.TransformPoint(ImGuiInterops::ToVector2D(ImGuiVertex.pos));
SlateVertex.Position[0] = VertexPosition.X;
SlateVertex.Position[1] = VertexPosition.Y;
SlateVertex.ClipRect = VertexClippingRect;
#else
SlateVertex.Position = Transform.TransformPoint(ImGuiInterops::ToVector2D(ImGuiVertex.pos));
#endif // WITH_OBSOLETE_CLIPPING_API
// Unpack ImU32 color.

16
Source/ImGui/Private/ImGuiDrawData.h
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@ -32,24 +32,26 @@ public:
// Get the draw command by number.
// @param CommandNb - Number of draw command
// @param Transform - Transform to apply to clipping rectangle
// @returns Draw command data
FORCEINLINE FImGuiDrawCommand GetCommand(int CommandNb) const
FImGuiDrawCommand GetCommand(int CommandNb, const FTransform2D& Transform) const
{
const ImDrawCmd& ImGuiCommand = ImGuiCommandBuffer[CommandNb];
return{ ImGuiCommand.ElemCount, ImGuiInterops::ToSlateRect(ImGuiCommand.ClipRect), ImGuiInterops::ToTextureIndex(ImGuiCommand.TextureId) };
return { ImGuiCommand.ElemCount, TransformRect(Transform, ImGuiInterops::ToSlateRect(ImGuiCommand.ClipRect)),
ImGuiInterops::ToTextureIndex(ImGuiCommand.TextureId) };
}
#if WITH_OBSOLETE_CLIPPING_API
// Transform and copy vertex data to target buffer (old data in the target buffer are replaced).
// @param OutVertexBuffer - Destination buffer
// @param VertexPositionOffset - Position offset added to every vertex to transform it to different space
// @param VertexClippingRect - Clipping rectangle for Slate vertices
void CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FVector2D VertexPositionOffset, const FSlateRotatedRect& VertexClippingRect) const;
// @param Transform - Transform to apply to all vertices
// @param VertexClippingRect - Clipping rectangle for transformed Slate vertices
void CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FTransform2D& Transform, const FSlateRotatedRect& VertexClippingRect) const;
#else
// Transform and copy vertex data to target buffer (old data in the target buffer are replaced).
// @param OutVertexBuffer - Destination buffer
// @param VertexPositionOffset - Position offset added to every vertex to transform it to different space
void CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FVector2D VertexPositionOffset) const;
// @param Transform - Transform to apply to all vertices
void CopyVertexData(TArray<FSlateVertex>& OutVertexBuffer, const FTransform2D& Transform) const;
#endif // WITH_OBSOLETE_CLIPPING_API
// Transform and copy index data to target buffer (old data in the target buffer are replaced).

6
Source/ImGui/Private/ImGuiInteroperability.h
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@ -85,6 +85,12 @@ namespace ImGuiInterops
return FSlateRect{ ImGuiRect.x, ImGuiRect.y, ImGuiRect.z, ImGuiRect.w };
}
// Convert from ImVec2 rectangle to FVector2D.
FORCEINLINE FVector2D ToVector2D(const ImVec2& ImGuiVector)
{
return FVector2D{ ImGuiVector.x, ImGuiVector.y };
}
// Convert from ImGui Texture Id to Texture Index that we use for texture resources.
FORCEINLINE TextureIndex ToTextureIndex(ImTextureID Index)
{

13
Source/ImGui/Private/SImGuiWidget.cpp
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@ -443,22 +443,25 @@ int32 SImGuiWidget::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeo
// Convert clipping rectangle to format required by Slate vertex.
const FSlateRotatedRect VertexClippingRect{ MyClippingRect };
// Scale -> CanvasOffset in Screen Space
const FTransform2D Transform{ VertexPositionOffset };
for (const auto& DrawList : ContextProxy->GetDrawData())
{
#if WITH_OBSOLETE_CLIPPING_API
DrawList.CopyVertexData(VertexBuffer, VertexPositionOffset, VertexClippingRect);
DrawList.CopyVertexData(VertexBuffer, Transform, VertexClippingRect);
// Get access to the Slate scissor rectangle defined in Slate Core API, so we can customize elements drawing.
extern SLATECORE_API TOptional<FShortRect> GSlateScissorRect;
auto GSlateScissorRectSaver = ScopeGuards::MakeStateSaver(GSlateScissorRect);
#else
DrawList.CopyVertexData(VertexBuffer, VertexPositionOffset);
DrawList.CopyVertexData(VertexBuffer, Transform);
#endif // WITH_OBSOLETE_CLIPPING_API
int IndexBufferOffset = 0;
for (int CommandNb = 0; CommandNb < DrawList.NumCommands(); CommandNb++)
{
const auto& DrawCommand = DrawList.GetCommand(CommandNb);
const auto& DrawCommand = DrawList.GetCommand(CommandNb, Transform);
DrawList.CopyIndexData(IndexBuffer, IndexBufferOffset, DrawCommand.NumElements);
@ -469,7 +472,7 @@ int32 SImGuiWidget::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeo
const FSlateResourceHandle& Handle = ModuleManager->GetTextureManager().GetTextureHandle(DrawCommand.TextureId);
// Transform clipping rectangle to screen space and apply to elements that we draw.
const FSlateRect ClippingRect = DrawCommand.ClippingRect.OffsetBy(MyClippingRect.GetTopLeft()).IntersectionWith(MyClippingRect);
const FSlateRect ClippingRect = DrawCommand.ClippingRect.IntersectionWith(MyClippingRect);
#if WITH_OBSOLETE_CLIPPING_API
GSlateScissorRect = FShortRect{ ClippingRect };
@ -534,7 +537,7 @@ static TArray<FKey> GetImGuiMappedKeys()
return Keys;
}
// Column layout unitlities.
// Column layout utilities.
namespace Columns
{
template<typename FunctorType>