83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2022 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 7 End-User License
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Agreement and JUCE Privacy Policy.
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End User License Agreement: www.juce.com/juce-7-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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/**
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An image that will be resampled before it is drawn.
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A plain Image only stores plain pixels, but does not store any information
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about how these pixels correspond to points. This means that if the image's
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dimensions are interpreted as points, then the image will be blurry when
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drawn on high resolution displays. If the image's dimensions are instead
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interpreted as corresponding to exact pixel positions, then the logical
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size of the image will change depending on the scale factor of the screen
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used to draw it.
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The ScaledImage class is designed to store an image alongside a scale
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factor that informs a renderer how to convert between the image's pixels
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and points.
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*/
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class JUCE_API ScaledImage
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{
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public:
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/** Creates a ScaledImage with an invalid image and unity scale.
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*/
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ScaledImage() = default;
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/** Creates a ScaledImage from an Image, where the dimensions of the image
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in pixels are exactly equal to its dimensions in points.
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*/
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explicit ScaledImage (const Image& imageIn)
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: ScaledImage (imageIn, 1.0) {}
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/** Creates a ScaledImage from an Image, using a custom scale factor.
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A scale of 1.0 means that the image's dimensions in pixels is equal to
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its dimensions in points.
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A scale of 2.0 means that the image contains 2 pixels per point in each
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direction.
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*/
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ScaledImage (const Image& imageIn, double scaleIn)
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: image (imageIn), scaleFactor (scaleIn) {}
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/** Returns the image at its original dimensions. */
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Image getImage() const { return image; }
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/** Returns the image's scale. */
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double getScale() const { return scaleFactor; }
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/** Returns the bounds of this image expressed in points. */
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Rectangle<double> getScaledBounds() const { return image.getBounds().toDouble() / scaleFactor; }
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private:
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Image image;
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double scaleFactor = 1.0;
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};
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} // namespace juce
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