axmol/core/base/CCNinePatchImageParser.cpp

/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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#include "base/CCNinePatchImageParser.h"
#include "platform/CCImage.h"
#include "base/CCDirector.h"

NS_CC_BEGIN

NinePatchImageParser::~NinePatchImageParser() {}

NinePatchImageParser::NinePatchImageParser() : _image(nullptr), _imageFrame(Rect::ZERO), _isRotated(false) {}

NinePatchImageParser::NinePatchImageParser(Image* image) : _image(image), _imageFrame(Rect::ZERO), _isRotated(false)
{
    this->_imageFrame = Rect(0, 0, image->getWidth(), image->getHeight());
    CCASSERT(image->getPixelFormat() == backend::PixelFormat::RGBA8,
             "unsupported format, currently only supports rgba8888");
}

NinePatchImageParser::NinePatchImageParser(Image* image, const Rect& frame, bool rotated)
    : _image(image), _imageFrame(frame), _isRotated(rotated)
{
    CCASSERT(image->getPixelFormat() == backend::PixelFormat::RGBA8,
             "unsupported format, currently only supports rgba8888");
}

int NinePatchImageParser::getFrameHeight() const
{
    if (_isRotated)
    {
        return _imageFrame.size.width;
    }
    return _imageFrame.size.height;
}

int NinePatchImageParser::getFrameWidth() const
{
    if (_isRotated)
    {
        return _imageFrame.size.height;
    }
    return _imageFrame.size.width;
}

int NinePatchImageParser::getPixelOriginOffset(Direction direction) const
{
    int imageWidth = _image->getWidth();
    int frameWidth = this->getFrameWidth();

    int topLineLeftOffset = (int)_imageFrame.origin.y * imageWidth * 4 + (int)_imageFrame.origin.x * 4;
    if (direction == Direction::HORIZONTAL)
    {
        return topLineLeftOffset;
    }
    else
    {
        if (_isRotated)
        {
            return topLineLeftOffset + (frameWidth - 1) * 4;
        }
        else
        {
            return topLineLeftOffset;
        }
    }
}

Vec2 NinePatchImageParser::parseHorizontalMargin() const
{
    unsigned char* data = _image->getData();

    data                    = data + this->getPixelOriginOffset(Direction::HORIZONTAL);
    unsigned char lastPixel = *(data + 3);
    int x1                  = 0;
    int x2                  = 0;

    int length = _imageFrame.origin.x + this->getFrameWidth();
    for (int i = (int)_imageFrame.origin.x; i <= length; i++)
    {
        unsigned char pixel = *(data + (i - (int)_imageFrame.origin.x) * 4 + 3);
        if (pixel != lastPixel)
        {
            if (pixel > 0)
            {
                x1 = (i - (int)_imageFrame.origin.x);
            }
            else
            {
                x2 = (i - (int)_imageFrame.origin.x);
                break;
            }
        }
        lastPixel = pixel;
    }
    return Vec2(x1, x2);
}

Vec2 NinePatchImageParser::parseVerticalMargin() const
{
    unsigned char* data = _image->getData();
    int imageWidth      = _image->getWidth();

    int y1 = 0;
    int y2 = 0;

    data                    = data + this->getPixelOriginOffset(Direction::VERTICAL);
    unsigned char lastPixel = *(data + 3);

    int length = (int)(_imageFrame.origin.y + this->getFrameHeight());
    for (int i = _imageFrame.origin.y; i <= length; i++)
    {
        unsigned char pixel = *(data + (i - (int)_imageFrame.origin.y) * imageWidth * 4 + 3);
        if (pixel != lastPixel)
        {
            if (pixel > 0)
            {
                y1 = (i - (int)_imageFrame.origin.y);
            }
            else
            {
                y2 = (i - (int)_imageFrame.origin.y);
                break;
            }
        }
        lastPixel = pixel;
    }
    return Vec2(y1, y2);
}

Rect NinePatchImageParser::parseCapInset() const
{
    Rect capInsets;
    Vec2 horizontalLine = this->parseHorizontalMargin();
    Vec2 verticalLine   = this->parseVerticalMargin();

    if (_isRotated)
    {
        capInsets = Rect(verticalLine.y, _imageFrame.size.height - horizontalLine.y, verticalLine.y - verticalLine.x,
                         horizontalLine.y - horizontalLine.x);
    }
    else
    {
        capInsets = Rect(horizontalLine.x, verticalLine.x, horizontalLine.y - horizontalLine.x,
                         verticalLine.y - verticalLine.x);
    }

    capInsets = CC_RECT_PIXELS_TO_POINTS(capInsets);
    return capInsets;
}

void NinePatchImageParser::setSpriteFrameInfo(Image* image, const cocos2d::Rect& frameRect, bool rotated)
{
    this->_image = image;
    CCASSERT(image->getPixelFormat() == backend::PixelFormat::RGBA8,
             "unsupported format, currently only supports rgba8888");
    this->_imageFrame = frameRect;
    this->_isRotated  = rotated;
}

bool NinePatchImageParser::isNinePatchImage(std::string_view filepath)
{
    size_t length = filepath.length();
    if (length < 7)
    {
        return false;
    }
    if (filepath.compare(length - 6, 6, ".9.png") == 0)
    {
        return true;
    }
    else
    {
        return false;
    }
}

NS_CC_END