72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// NoesisGUI - http://www.noesisengine.com
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// Copyright (c) 2013 Noesis Technologies S.L. All Rights Reserved.
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#ifndef __GUI_TEXTUREPROVIDER_H__
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#define __GUI_TEXTUREPROVIDER_H__
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#include <NsCore/Noesis.h>
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#include <NsCore/BaseComponent.h>
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#include <NsCore/Delegate.h>
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namespace Noesis
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{
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struct Uri;
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class Texture;
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class RenderDevice;
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template<class T> class Ptr;
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// Texture metadata returned by TextureProvider::GetTextureInfo()
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// The rectangle [x, y, width, height] defines the logical surface used by the texture
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// Note that the provider can reuse the same texture with different names and rectangles to
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// implementing texture atlas compatible with standard XAML. For example:
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//
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// - ItemA ==> Atlas.png [0, 0, 100, 100]
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// - ItemB ==> Atlas.png [0, 100, 100, 200]
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//
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// <StackPanel>
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// <Image Source="ItemA.png"/>
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// <Image Source="ItemB.png"/>
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// </StackPanel>
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//
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// The member 'dpiScale' can be used for scaling (eg: 96 dpi = 1.0, 72 dpi = 0.75 (72/96))
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struct TextureInfo
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{
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uint32_t width = 0;
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uint32_t height = 0;
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uint32_t x = 0;
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uint32_t y = 0;
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float dpiScale = 1.0f;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Base class for implementing providers of textures
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////////////////////////////////////////////////////////////////////////////////////////////////////
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class TextureProvider: public BaseComponent
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{
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public:
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/// Returns metadata for the texture at the given URI or empty rectangle if texture is not found
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virtual TextureInfo GetTextureInfo(const Uri& uri) = 0;
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/// Returns a texture compatible with the given device or null if texture is not found
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virtual Ptr<Texture> LoadTexture(const Uri& uri, RenderDevice* device) = 0;
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/// Delegate to notify changes to the texture file content
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typedef Delegate<void (const Uri&)> TextureChangedDelegate;
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TextureChangedDelegate& TextureChanged() { return mTextureChanged; }
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void RaiseTextureChanged(const Uri& uri) { mTextureChanged(uri); }
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private:
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TextureChangedDelegate mTextureChanged;
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};
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}
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#endif
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