hyperion.ng/libsrc/utils/ImageResampler.cpp

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#include "utils/ImageResampler.h"
#include <utils/Logger.h>
ImageResampler::ImageResampler()
: _horizontalDecimation(1)
, _verticalDecimation(1)
, _cropLeft(0)
, _cropRight(0)
, _cropTop(0)
, _cropBottom(0)
, _videoMode(VideoMode::VIDEO_2D)
{
}
ImageResampler::~ImageResampler()
{
}
void ImageResampler::setHorizontalPixelDecimation(int decimator)
{
_horizontalDecimation = decimator;
}
void ImageResampler::setVerticalPixelDecimation(int decimator)
{
_verticalDecimation = decimator;
}
void ImageResampler::setCropping(int cropLeft, int cropRight, int cropTop, int cropBottom)
{
_cropLeft = cropLeft;
_cropRight = cropRight;
_cropTop = cropTop;
_cropBottom = cropBottom;
}
void ImageResampler::setVideoMode(VideoMode mode)
{
_videoMode = mode;
}
void ImageResampler::processImage(const uint8_t * data, int width, int height, int lineLength, PixelFormat pixelFormat, Image<ColorRgb> &outputImage) const
{
int cropRight = _cropRight;
int cropBottom = _cropBottom;
// handle 3D mode
switch (_videoMode)
{
case VideoMode::VIDEO_3DSBS:
cropRight = width >> 1;
break;
case VideoMode::VIDEO_3DTAB:
cropBottom = width >> 1;
break;
default:
break;
}
// calculate the output size
int outputWidth = (width - _cropLeft - cropRight - (_horizontalDecimation >> 1) + _horizontalDecimation - 1) / _horizontalDecimation;
int outputHeight = (height - _cropTop - cropBottom - (_verticalDecimation >> 1) + _verticalDecimation - 1) / _verticalDecimation;
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if (outputImage.width() != outputWidth || outputImage.height() != outputHeight)
outputImage.resize(outputWidth, outputHeight);
for (int yDest = 0, ySource = _cropTop + (_verticalDecimation >> 1); yDest < outputHeight; ySource += _verticalDecimation, ++yDest)
{
for (int xDest = 0, xSource = _cropLeft + (_horizontalDecimation >> 1); xDest < outputWidth; xSource += _horizontalDecimation, ++xDest)
{
ColorRgb & rgb = outputImage(xDest, yDest);
switch (pixelFormat)
{
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case PixelFormat::UYVY:
{
int index = lineLength * ySource + (xSource << 1);
uint8_t y = data[index+1];
uint8_t u = ((xSource&1) == 0) ? data[index ] : data[index-2];
uint8_t v = ((xSource&1) == 0) ? data[index+2] : data[index ];
yuv2rgb(y, u, v, rgb.red, rgb.green, rgb.blue);
}
break;
case PixelFormat::YUYV:
{
int index = lineLength * ySource + (xSource << 1);
uint8_t y = data[index];
uint8_t u = ((xSource&1) == 0) ? data[index+1] : data[index-1];
uint8_t v = ((xSource&1) == 0) ? data[index+3] : data[index+1];
yuv2rgb(y, u, v, rgb.red, rgb.green, rgb.blue);
}
break;
case PixelFormat::BGR16:
{
int index = lineLength * ySource + (xSource << 1);
rgb.blue = (data[index] & 0x1f) << 3;
rgb.green = (((data[index+1] & 0x7) << 3) | (data[index] & 0xE0) >> 5) << 2;
rgb.red = (data[index+1] & 0xF8);
}
break;
case PixelFormat::BGR24:
{
int index = lineLength * ySource + (xSource << 1) + xSource;
rgb.blue = data[index ];
rgb.green = data[index+1];
rgb.red = data[index+2];
}
break;
case PixelFormat::RGB32:
{
int index = lineLength * ySource + (xSource << 2);
rgb.red = data[index ];
rgb.green = data[index+1];
rgb.blue = data[index+2];
}
break;
case PixelFormat::BGR32:
{
int index = lineLength * ySource + (xSource << 2);
rgb.blue = data[index ];
rgb.green = data[index+1];
rgb.red = data[index+2];
}
break;
#ifdef HAVE_JPEG_DECODER
case PixelFormat::MJPEG:
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break;
#endif
case PixelFormat::NO_CHANGE:
Error(Logger::getInstance("ImageResampler"), "Invalid pixel format given");
break;
}
}
}
}
uint8_t ImageResampler::clamp(int x)
{
return (x<0) ? 0 : ((x>255) ? 255 : uint8_t(x));
}
void ImageResampler::yuv2rgb(uint8_t y, uint8_t u, uint8_t v, uint8_t &r, uint8_t &g, uint8_t &b)
{
// see: http://en.wikipedia.org/wiki/YUV#Y.27UV444_to_RGB888_conversion
int c = y - 16;
int d = u - 128;
int e = v - 128;
r = clamp((298 * c + 409 * e + 128) >> 8);
g = clamp((298 * c - 100 * d - 208 * e + 128) >> 8);
b = clamp((298 * c + 516 * d + 128) >> 8);
}