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112 lines
4.5 KiB
C++
112 lines
4.5 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce::detail
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{
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struct StandardCachedComponentImage : public CachedComponentImage
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{
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explicit StandardCachedComponentImage (Component& c) noexcept
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: owner (c)
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{
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}
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void paint (Graphics& g) override
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{
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scale = g.getInternalContext().getPhysicalPixelScaleFactor();
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auto compBounds = owner.getLocalBounds();
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auto imageBounds = compBounds * scale;
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if (image.isNull() || image.getBounds() != imageBounds)
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{
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auto tempImageType = g.getInternalContext().getPreferredImageTypeForTemporaryImages();
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image = Image (owner.isOpaque() ? Image::RGB
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: Image::ARGB,
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jmax (1, imageBounds.getWidth()),
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jmax (1, imageBounds.getHeight()),
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! owner.isOpaque(),
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*tempImageType);
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image.setBackupEnabled (false);
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validArea.clear();
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}
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// If the cached image is outdated but cannot be backed-up, this indicates that the graphics
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// device holding the most recent copy of the cached image has gone away. Therefore, we've
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// effectively lost the contents of the cache, and we must repaint the entire component.
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if (auto ptr = image.getPixelData())
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if (auto* extensions = ptr->getBackupExtensions())
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if (extensions->needsBackup() && ! extensions->canBackup())
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validArea.clear();
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if (! validArea.containsRectangle (compBounds))
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{
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Graphics imG (image);
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auto& lg = imG.getInternalContext();
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lg.addTransform (AffineTransform::scale (scale));
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for (auto& i : validArea)
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lg.excludeClipRectangle (i);
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if (! owner.isOpaque())
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{
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lg.setFill (Colours::transparentBlack);
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lg.fillRect (compBounds, true);
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lg.setFill (Colours::black);
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}
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owner.paintEntireComponent (imG, true);
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}
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validArea = compBounds;
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g.setColour (Colours::black.withAlpha (owner.getAlpha()));
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g.drawImageTransformed (image, AffineTransform::scale ((float) compBounds.getWidth() / (float) imageBounds.getWidth(),
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(float) compBounds.getHeight() / (float) imageBounds.getHeight()), false);
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}
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bool invalidateAll() override { validArea.clear(); return true; }
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bool invalidate (const Rectangle<int>& area) override { validArea.subtract (area); return true; }
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void releaseResources() override { image = Image(); }
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private:
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Image image;
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RectangleList<int> validArea;
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Component& owner;
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float scale = 1.0f;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (StandardCachedComponentImage)
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};
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} // namespace juce::detail
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