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Fix output size of X11 image after deciamtion

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Former-commit-id: c6120c7c4116f855405f65c21b0c0f5e1e443b6b
This commit is contained in:
poljvd 2014-12-01 21:27:33 +01:00
parent 0fd25285a6
commit bf7ddf5991
2 changed files with 614 additions and 600 deletions
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5
libsrc/grabber/v4l2/V4L2Grabber.cpp
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@ -706,6 +706,11 @@ void V4L2Grabber::process_image(const uint8_t * data)
// create output structure
int outputWidth = (width - _cropLeft - _cropRight + _horizontalPixelDecimation/2) / _horizontalPixelDecimation;
int outputHeight = (height - _cropTop - _cropBottom + _verticalPixelDecimation/2) / _verticalPixelDecimation;
// TODO: should this be the following (like X11):
//int outputWidth = (width - _cropLeft - _cropRight + _horizontalPixelDecimation/2 - 1) / _horizontalPixelDecimation + 1;
//int outputHeight = (height - _cropTop - _cropBottom + _verticalPixelDecimation/2 - 1) / _verticalPixelDecimation + 1;
Image<ColorRgb> image(outputWidth, outputHeight);
for (int ySource = _cropTop + _verticalPixelDecimation/2, yDest = 0; ySource < height - _cropBottom; ySource += _verticalPixelDecimation, ++yDest)

13
libsrc/grabber/x11/X11Grabber.cpp
View File

@ -64,8 +64,11 @@ Image<ColorRgb> & X11Grabber::grab()
// Copy the capture XImage to the local image (and apply required decimation)
ColorRgb * outputPtr = _image.memptr();
int width = 0;
int height = 0;
for (int iY=(_pixelDecimation/2); iY<croppedHeight; iY+=_pixelDecimation)
{
width = 0;
for (int iX=(_pixelDecimation/2); iX<croppedWidth; iX+=_pixelDecimation)
{
// Extract the pixel from the X11-image
@ -78,8 +81,13 @@ Image<ColorRgb> & X11Grabber::grab()
// Move to the next output pixel
++outputPtr;
++width;
}
++height;
}
std::cout << "decimated X11 message: " << width << " x " << height << std::endl;
// Cleanup allocated resources of the X11 grab
XDestroyImage(xImage);
@ -107,8 +115,9 @@ int X11Grabber::updateScreenDimensions()
std::cout << "[" << _screenWidth << "x" << _screenHeight <<"]" << std::endl;
// Update the size of the buffer used to transfer the screenshot
int width = (_screenWidth - 2 * _cropWidth + _pixelDecimation/2) / _pixelDecimation;
int height = (_screenHeight - 2 * _cropHeight + _pixelDecimation/2) / _pixelDecimation;
int width = (_screenWidth - 2 * _cropWidth - _pixelDecimation/2 - 1) / _pixelDecimation + 1;
int height = (_screenHeight - 2 * _cropHeight - _pixelDecimation/2 - 1) / _pixelDecimation + 1;
_image.resize(width, height);
return 0;