JUCE/modules/juce_gui_basics/drawables/juce_DrawableImage.cpp

/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
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   framework to you, and you must discontinue the installation or download
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   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

DrawableImage::DrawableImage() : bounds ({ 0.0f, 0.0f, 1.0f, 1.0f })
{
}

DrawableImage::DrawableImage (const DrawableImage& other)
    : Drawable (other),
      image (other.image),
      opacity (other.opacity),
      overlayColour (other.overlayColour),
      bounds (other.bounds)
{
    setBounds (other.getBounds());
}

DrawableImage::DrawableImage (const Image& imageToUse)
{
    setImageInternal (imageToUse);
}

DrawableImage::~DrawableImage()
{
}

std::unique_ptr<Drawable> DrawableImage::createCopy() const
{
    return std::make_unique<DrawableImage> (*this);
}

//==============================================================================
void DrawableImage::setImage (const Image& imageToUse)
{
    if (setImageInternal (imageToUse))
        repaint();
}

void DrawableImage::setOpacity (const float newOpacity)
{
    opacity = newOpacity;
}

void DrawableImage::setOverlayColour (Colour newOverlayColour)
{
    overlayColour = newOverlayColour;
}

void DrawableImage::setBoundingBox (Rectangle<float> newBounds)
{
    setBoundingBox (Parallelogram<float> (newBounds));
}

void DrawableImage::setBoundingBox (Parallelogram<float> newBounds)
{
    if (bounds != newBounds)
    {
        bounds = newBounds;

        if (image.isValid())
        {
            auto tr = bounds.topLeft + (bounds.topRight   - bounds.topLeft) / (float) image.getWidth();
            auto bl = bounds.topLeft + (bounds.bottomLeft - bounds.topLeft) / (float) image.getHeight();

            auto t = AffineTransform::fromTargetPoints (bounds.topLeft.x, bounds.topLeft.y,
                                                        tr.x, tr.y,
                                                        bl.x, bl.y);

            if (t.isSingularity())
                t = {};

            setTransform (t);
        }
    }
}

//==============================================================================
void DrawableImage::paint (Graphics& g)
{
    if (image.isValid())
    {
        if (opacity > 0.0f && ! overlayColour.isOpaque())
        {
            g.setOpacity (opacity);
            g.drawImageAt (image, 0, 0, false);
        }

        if (! overlayColour.isTransparent())
        {
            g.setColour (overlayColour.withMultipliedAlpha (opacity));
            g.drawImageAt (image, 0, 0, true);
        }
    }
}

Rectangle<float> DrawableImage::getDrawableBounds() const
{
    return image.getBounds().toFloat();
}

bool DrawableImage::hitTest (int x, int y)
{
    return Drawable::hitTest (x, y) && image.isValid() && image.getPixelAt (x, y).getAlpha() >= 127;
}

Path DrawableImage::getOutlineAsPath() const
{
    return {}; // not applicable for images
}

//==============================================================================
bool DrawableImage::setImageInternal (const Image& imageToUse)
{
    if (image != imageToUse)
    {
        image = imageToUse;
        setBounds (image.getBounds());
        setBoundingBox (image.getBounds().toFloat());
        return true;
    }

    return false;
}

//==============================================================================
std::unique_ptr<AccessibilityHandler> DrawableImage::createAccessibilityHandler()
{
    return std::make_unique<AccessibilityHandler> (*this, AccessibilityRole::image);
}

} // namespace juce