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dexed/JuceLibraryCode/modules/juce_graphics/images/juce_Image.cpp

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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2013 - Raw Material Software Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
ImagePixelData::ImagePixelData (const Image::PixelFormat format, const int w, const int h)
: pixelFormat (format), width (w), height (h)
{
jassert (format == Image::RGB || format == Image::ARGB || format == Image::SingleChannel);
jassert (w > 0 && h > 0); // It's illegal to create a zero-sized image!
}
ImagePixelData::~ImagePixelData()
{
}
//==============================================================================
ImageType::ImageType() {}
ImageType::~ImageType() {}
Image ImageType::convert (const Image& source) const
{
if (source.isNull() || getTypeID() == (ScopedPointer<ImageType> (source.getPixelData()->createType())->getTypeID()))
return source;
const Image::BitmapData src (source, Image::BitmapData::readOnly);
Image newImage (create (src.pixelFormat, src.width, src.height, false));
Image::BitmapData dest (newImage, Image::BitmapData::writeOnly);
jassert (src.pixelStride == dest.pixelStride && src.pixelFormat == dest.pixelFormat);
for (int y = 0; y < dest.height; ++y)
memcpy (dest.getLinePointer (y), src.getLinePointer (y), (size_t) dest.lineStride);
return newImage;
}
//==============================================================================
class SoftwarePixelData : public ImagePixelData
{
public:
SoftwarePixelData (const Image::PixelFormat format_, const int w, const int h, const bool clearImage)
: ImagePixelData (format_, w, h),
pixelStride (format_ == Image::RGB ? 3 : ((format_ == Image::ARGB) ? 4 : 1)),
lineStride ((pixelStride * jmax (1, w) + 3) & ~3)
{
imageData.allocate ((size_t) (lineStride * jmax (1, h)), clearImage);
}
LowLevelGraphicsContext* createLowLevelContext() override
{
return new LowLevelGraphicsSoftwareRenderer (Image (this));
}
void initialiseBitmapData (Image::BitmapData& bitmap, int x, int y, Image::BitmapData::ReadWriteMode) override
{
bitmap.data = imageData + x * pixelStride + y * lineStride;
bitmap.pixelFormat = pixelFormat;
bitmap.lineStride = lineStride;
bitmap.pixelStride = pixelStride;
}
ImagePixelData* clone() override
{
SoftwarePixelData* s = new SoftwarePixelData (pixelFormat, width, height, false);
memcpy (s->imageData, imageData, (size_t) (lineStride * height));
return s;
}
ImageType* createType() const override { return new SoftwareImageType(); }
private:
HeapBlock<uint8> imageData;
const int pixelStride, lineStride;
JUCE_LEAK_DETECTOR (SoftwarePixelData)
};
SoftwareImageType::SoftwareImageType() {}
SoftwareImageType::~SoftwareImageType() {}
ImagePixelData::Ptr SoftwareImageType::create (Image::PixelFormat format, int width, int height, bool clearImage) const
{
return new SoftwarePixelData (format, width, height, clearImage);
}
int SoftwareImageType::getTypeID() const
{
return 2;
}
//==============================================================================
NativeImageType::NativeImageType() {}
NativeImageType::~NativeImageType() {}
int NativeImageType::getTypeID() const
{
return 1;
}
#if JUCE_WINDOWS || JUCE_LINUX
ImagePixelData::Ptr NativeImageType::create (Image::PixelFormat format, int width, int height, bool clearImage) const
{
return new SoftwarePixelData (format, width, height, clearImage);
}
#endif
//==============================================================================
class SubsectionPixelData : public ImagePixelData
{
public:
SubsectionPixelData (ImagePixelData* const im, const Rectangle<int>& r)
: ImagePixelData (im->pixelFormat, r.getWidth(), r.getHeight()),
image (im), area (r)
{
}
LowLevelGraphicsContext* createLowLevelContext() override
{
LowLevelGraphicsContext* g = image->createLowLevelContext();
g->clipToRectangle (area);
g->setOrigin (area.getPosition());
return g;
}
void initialiseBitmapData (Image::BitmapData& bitmap, int x, int y, Image::BitmapData::ReadWriteMode mode) override
{
image->initialiseBitmapData (bitmap, x + area.getX(), y + area.getY(), mode);
}
ImagePixelData* clone() override
{
jassert (getReferenceCount() > 0); // (This method can't be used on an unowned pointer, as it will end up self-deleting)
const ScopedPointer<ImageType> type (image->createType());
Image newImage (type->create (pixelFormat, area.getWidth(), area.getHeight(), pixelFormat != Image::RGB));
{
Graphics g (newImage);
g.drawImageAt (Image (this), 0, 0);
}
newImage.getPixelData()->incReferenceCount();
return newImage.getPixelData();
}
ImageType* createType() const override { return image->createType(); }
private:
const ImagePixelData::Ptr image;
const Rectangle<int> area;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SubsectionPixelData)
};
Image Image::getClippedImage (const Rectangle<int>& area) const
{
if (area.contains (getBounds()))
return *this;
const Rectangle<int> validArea (area.getIntersection (getBounds()));
return Image (validArea.isEmpty() ? nullptr : new SubsectionPixelData (image, validArea));
}
//==============================================================================
Image::Image()
{
}
Image::Image (ImagePixelData* const instance)
: image (instance)
{
}
Image::Image (const PixelFormat format, int width, int height, bool clearImage)
: image (NativeImageType().create (format, width, height, clearImage))
{
}
Image::Image (const PixelFormat format, int width, int height, bool clearImage, const ImageType& type)
: image (type.create (format, width, height, clearImage))
{
}
Image::Image (const Image& other)
: image (other.image)
{
}
Image& Image::operator= (const Image& other)
{
image = other.image;
return *this;
}
#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS
Image::Image (Image&& other) noexcept
: image (static_cast <ImagePixelData::Ptr&&> (other.image))
{
}
Image& Image::operator= (Image&& other) noexcept
{
image = static_cast <ImagePixelData::Ptr&&> (other.image);
return *this;
}
#endif
Image::~Image()
{
}
const Image Image::null;
int Image::getReferenceCount() const noexcept { return image == nullptr ? 0 : image->getReferenceCount(); }
int Image::getWidth() const noexcept { return image == nullptr ? 0 : image->width; }
int Image::getHeight() const noexcept { return image == nullptr ? 0 : image->height; }
Rectangle<int> Image::getBounds() const noexcept { return image == nullptr ? Rectangle<int>() : Rectangle<int> (image->width, image->height); }
Image::PixelFormat Image::getFormat() const noexcept { return image == nullptr ? UnknownFormat : image->pixelFormat; }
bool Image::isARGB() const noexcept { return getFormat() == ARGB; }
bool Image::isRGB() const noexcept { return getFormat() == RGB; }
bool Image::isSingleChannel() const noexcept { return getFormat() == SingleChannel; }
bool Image::hasAlphaChannel() const noexcept { return getFormat() != RGB; }
LowLevelGraphicsContext* Image::createLowLevelContext() const
{
return image == nullptr ? nullptr : image->createLowLevelContext();
}
void Image::duplicateIfShared()
{
if (image != nullptr && image->getReferenceCount() > 1)
image = image->clone();
}
Image Image::createCopy() const
{
if (image != nullptr)
return Image (image->clone());
return Image();
}
Image Image::rescaled (const int newWidth, const int newHeight, const Graphics::ResamplingQuality quality) const
{
if (image == nullptr || (image->width == newWidth && image->height == newHeight))
return *this;
const ScopedPointer<ImageType> type (image->createType());
Image newImage (type->create (image->pixelFormat, newWidth, newHeight, hasAlphaChannel()));
Graphics g (newImage);
g.setImageResamplingQuality (quality);
g.drawImageTransformed (*this, AffineTransform::scale (newWidth / (float) image->width,
newHeight / (float) image->height), false);
return newImage;
}
Image Image::convertedToFormat (PixelFormat newFormat) const
{
if (image == nullptr || newFormat == image->pixelFormat)
return *this;
const int w = image->width, h = image->height;
const ScopedPointer<ImageType> type (image->createType());
Image newImage (type->create (newFormat, w, h, false));
if (newFormat == SingleChannel)
{
if (! hasAlphaChannel())
{
newImage.clear (getBounds(), Colours::black);
}
else
{
const BitmapData destData (newImage, 0, 0, w, h, BitmapData::writeOnly);
const BitmapData srcData (*this, 0, 0, w, h);
for (int y = 0; y < h; ++y)
{
const PixelARGB* const src = (const PixelARGB*) srcData.getLinePointer (y);
uint8* const dst = destData.getLinePointer (y);
for (int x = 0; x < w; ++x)
dst[x] = src[x].getAlpha();
}
}
}
else if (image->pixelFormat == SingleChannel && newFormat == Image::ARGB)
{
const BitmapData destData (newImage, 0, 0, w, h, BitmapData::writeOnly);
const BitmapData srcData (*this, 0, 0, w, h);
for (int y = 0; y < h; ++y)
{
const PixelAlpha* const src = (const PixelAlpha*) srcData.getLinePointer (y);
PixelARGB* const dst = (PixelARGB*) destData.getLinePointer (y);
for (int x = 0; x < w; ++x)
dst[x].set (src[x]);
}
}
else
{
if (hasAlphaChannel())
newImage.clear (getBounds());
Graphics g (newImage);
g.drawImageAt (*this, 0, 0);
}
return newImage;
}
NamedValueSet* Image::getProperties() const
{
return image == nullptr ? nullptr : &(image->userData);
}
//==============================================================================
Image::BitmapData::BitmapData (Image& im, const int x, const int y, const int w, const int h, BitmapData::ReadWriteMode mode)
: width (w), height (h)
{
// The BitmapData class must be given a valid image, and a valid rectangle within it!
jassert (im.image != nullptr);
jassert (x >= 0 && y >= 0 && w > 0 && h > 0 && x + w <= im.getWidth() && y + h <= im.getHeight());
im.image->initialiseBitmapData (*this, x, y, mode);
jassert (data != nullptr && pixelStride > 0 && lineStride != 0);
}
Image::BitmapData::BitmapData (const Image& im, const int x, const int y, const int w, const int h)
: width (w), height (h)
{
// The BitmapData class must be given a valid image, and a valid rectangle within it!
jassert (im.image != nullptr);
jassert (x >= 0 && y >= 0 && w > 0 && h > 0 && x + w <= im.getWidth() && y + h <= im.getHeight());
im.image->initialiseBitmapData (*this, x, y, readOnly);
jassert (data != nullptr && pixelStride > 0 && lineStride != 0);
}
Image::BitmapData::BitmapData (const Image& im, BitmapData::ReadWriteMode mode)
: width (im.getWidth()),
height (im.getHeight())
{
// The BitmapData class must be given a valid image!
jassert (im.image != nullptr);
im.image->initialiseBitmapData (*this, 0, 0, mode);
jassert (data != nullptr && pixelStride > 0 && lineStride != 0);
}
Image::BitmapData::~BitmapData()
{
}
Colour Image::BitmapData::getPixelColour (const int x, const int y) const noexcept
{
jassert (isPositiveAndBelow (x, width) && isPositiveAndBelow (y, height));
const uint8* const pixel = getPixelPointer (x, y);
switch (pixelFormat)
{
case Image::ARGB: return Colour (((const PixelARGB*) pixel)->getUnpremultipliedARGB());
case Image::RGB: return Colour (((const PixelRGB*) pixel)->getUnpremultipliedARGB());
case Image::SingleChannel: return Colour (((const PixelAlpha*) pixel)->getUnpremultipliedARGB());
default: jassertfalse; break;
}
return Colour();
}
void Image::BitmapData::setPixelColour (const int x, const int y, Colour colour) const noexcept
{
jassert (isPositiveAndBelow (x, width) && isPositiveAndBelow (y, height));
uint8* const pixel = getPixelPointer (x, y);
const PixelARGB col (colour.getPixelARGB());
switch (pixelFormat)
{
case Image::ARGB: ((PixelARGB*) pixel)->set (col); break;
case Image::RGB: ((PixelRGB*) pixel)->set (col); break;
case Image::SingleChannel: ((PixelAlpha*) pixel)->set (col); break;
default: jassertfalse; break;
}
}
//==============================================================================
void Image::clear (const Rectangle<int>& area, Colour colourToClearTo)
{
const ScopedPointer<LowLevelGraphicsContext> g (image->createLowLevelContext());
g->setFill (colourToClearTo);
g->fillRect (area, true);
}
//==============================================================================
Colour Image::getPixelAt (const int x, const int y) const
{
if (isPositiveAndBelow (x, getWidth()) && isPositiveAndBelow (y, getHeight()))
{
const BitmapData srcData (*this, x, y, 1, 1);
return srcData.getPixelColour (0, 0);
}
return Colour();
}
void Image::setPixelAt (const int x, const int y, Colour colour)
{
if (isPositiveAndBelow (x, getWidth()) && isPositiveAndBelow (y, getHeight()))
{
const BitmapData destData (*this, x, y, 1, 1, BitmapData::writeOnly);
destData.setPixelColour (0, 0, colour);
}
}
void Image::multiplyAlphaAt (const int x, const int y, const float multiplier)
{
if (isPositiveAndBelow (x, getWidth()) && isPositiveAndBelow (y, getHeight())
&& hasAlphaChannel())
{
const BitmapData destData (*this, x, y, 1, 1, BitmapData::readWrite);
if (isARGB())
((PixelARGB*) destData.data)->multiplyAlpha (multiplier);
else
*(destData.data) = (uint8) (*(destData.data) * multiplier);
}
}
template <class PixelType>
struct PixelIterator
{
template <class PixelOperation>
static void iterate (const Image::BitmapData& data, const PixelOperation& pixelOp)
{
for (int y = 0; y < data.height; ++y)
{
uint8* p = data.getLinePointer (y);
for (int x = 0; x < data.width; ++x)
{
pixelOp (*(PixelType*) p);
p += data.pixelStride;
}
}
}
};
template <class PixelOperation>
static void performPixelOp (const Image::BitmapData& data, const PixelOperation& pixelOp)
{
switch (data.pixelFormat)
{
case Image::ARGB: PixelIterator<PixelARGB> ::iterate (data, pixelOp); break;
case Image::RGB: PixelIterator<PixelRGB> ::iterate (data, pixelOp); break;
case Image::SingleChannel: PixelIterator<PixelAlpha>::iterate (data, pixelOp); break;
default: jassertfalse; break;
}
}
struct AlphaMultiplyOp
{
AlphaMultiplyOp (float alpha_) noexcept : alpha (alpha_) {}
const float alpha;
template <class PixelType>
void operator() (PixelType& pixel) const
{
pixel.multiplyAlpha (alpha);
}
JUCE_DECLARE_NON_COPYABLE (AlphaMultiplyOp)
};
void Image::multiplyAllAlphas (const float amountToMultiplyBy)
{
jassert (hasAlphaChannel());
const BitmapData destData (*this, 0, 0, getWidth(), getHeight(), BitmapData::readWrite);
performPixelOp (destData, AlphaMultiplyOp (amountToMultiplyBy));
}
struct DesaturateOp
{
template <class PixelType>
void operator() (PixelType& pixel) const
{
pixel.desaturate();
}
};
void Image::desaturate()
{
if (isARGB() || isRGB())
{
const BitmapData destData (*this, 0, 0, getWidth(), getHeight(), BitmapData::readWrite);
performPixelOp (destData, DesaturateOp());
}
}
void Image::createSolidAreaMask (RectangleList<int>& result, const float alphaThreshold) const
{
if (hasAlphaChannel())
{
const uint8 threshold = (uint8) jlimit (0, 255, roundToInt (alphaThreshold * 255.0f));
SparseSet<int> pixelsOnRow;
const BitmapData srcData (*this, 0, 0, getWidth(), getHeight());
for (int y = 0; y < srcData.height; ++y)
{
pixelsOnRow.clear();
const uint8* lineData = srcData.getLinePointer (y);
if (isARGB())
{
for (int x = 0; x < srcData.width; ++x)
{
if (((const PixelARGB*) lineData)->getAlpha() >= threshold)
pixelsOnRow.addRange (Range<int> (x, x + 1));
lineData += srcData.pixelStride;
}
}
else
{
for (int x = 0; x < srcData.width; ++x)
{
if (*lineData >= threshold)
pixelsOnRow.addRange (Range<int> (x, x + 1));
lineData += srcData.pixelStride;
}
}
for (int i = 0; i < pixelsOnRow.getNumRanges(); ++i)
{
const Range<int> range (pixelsOnRow.getRange (i));
result.add (Rectangle<int> (range.getStart(), y, range.getLength(), 1));
}
result.consolidate();
}
}
else
{
result.add (0, 0, getWidth(), getHeight());
}
}
void Image::moveImageSection (int dx, int dy,
int sx, int sy,
int w, int h)
{
if (dx < 0)
{
w += dx;
sx -= dx;
dx = 0;
}
if (dy < 0)
{
h += dy;
sy -= dy;
dy = 0;
}
if (sx < 0)
{
w += sx;
dx -= sx;
sx = 0;
}
if (sy < 0)
{
h += sy;
dy -= sy;
sy = 0;
}
const int minX = jmin (dx, sx);
const int minY = jmin (dy, sy);
w = jmin (w, getWidth() - jmax (sx, dx));
h = jmin (h, getHeight() - jmax (sy, dy));
if (w > 0 && h > 0)
{
const int maxX = jmax (dx, sx) + w;
const int maxY = jmax (dy, sy) + h;
const BitmapData destData (*this, minX, minY, maxX - minX, maxY - minY, BitmapData::readWrite);
uint8* dst = destData.getPixelPointer (dx - minX, dy - minY);
const uint8* src = destData.getPixelPointer (sx - minX, sy - minY);
const size_t lineSize = (size_t) (destData.pixelStride * w);
if (dy > sy)
{
while (--h >= 0)
{
const int offset = h * destData.lineStride;
memmove (dst + offset, src + offset, lineSize);
}
}
else if (dst != src)
{
while (--h >= 0)
{
memmove (dst, src, lineSize);
dst += destData.lineStride;
src += destData.lineStride;
}
}
}
}