PixelBuffer * Filter::generateFilteredBuffer(const PixelBuffer & input_buffer) {
PixelBuffer * output_buffer = new PixelBuffer(input_buffer.getWidth(), input_buffer.getHeight(), input_buffer.getBackground());
for (int i = 0; i < input_buffer.getWidth(); i++) {
for (int j = 0; j < input_buffer.getHeight(); j++) {
ColorData p = generatePixel(input_buffer, i, j);
output_buffer->setPixel(i, j, p.clampedColor());
}
}
return output_buffer;
}
// Default implementation of 2D convolution
void ConvolutionTool::applyToolOnCanvas(PixelBuffer* pixel_buffer){
// check if the tool mask is valid
if(m_mask == NULL){
cerr << "[ConvolutionTool] mask is null" << endl;
return;
}
// Dimensions of the canvas and mask
int width = pixel_buffer->getWidth();
int height = pixel_buffer->getHeight();
int mw = m_mask->getWidth();
int mh = m_mask->getHeight();
// Coordinates to access the canvas
int posx,posy;
// Declare variable to store intermediate results
ColorData tmp;
PixelBuffer tmpPb(width,height, ColorData(0.0,0.0,0.0));
// 2D Convolution
for(int x = 0; x < width; x++){
for(int y = 0; y < height; y++){
tmp = ColorData(0.0,0.0,0.0);
// Multiply every value of the mask a corresponding image pixel
for(int mx = 0; mx < mw; mx++){
for(int my = 0; my < mh; my++){
posx = (x - mw / 2 + mx);
posy = (y - mh / 2 + my);
// If trying to access out of bounds indicies, skip
if(posx < 0 || posy < 0 || posx >= width || posy >= height) continue;
// Accumulate values
tmp = tmp + (pixel_buffer->getPixel(posx,posy) * m_mask->getValue(mx,my));
}
}
tmpPb.setPixel(x,y,tmp.clampedColor());
}
}
// Set result
PixelBuffer::copyPixelBuffer(&tmpPb,pixel_buffer);
}
///apply filter effect to the PixelBuffer* buffer passed into this function
void FBlur::applyFilter(PixelBuffer* imageBuffer){
// if kernel is already initialized, do not need initialize it again.
kernel = buildKernel(std::round(getFloatParameter()));
// printKernel();
if(getName() == "FEdgeDetection"){
imageBuffer -> convertToLuminance();
}
int width = imageBuffer -> getWidth();
int height = imageBuffer -> getHeight();
//create a new pixel buffer for storing the convolution result.
PixelBuffer* newImageBuffer
= new PixelBuffer(width, height, imageBuffer -> getBackgroundColor());
for(int i = 0; i < width; i++){
for(int j = 0; j < height; j++){
float newRed = 0;
float newGreen = 0;
float newBlue = 0;
for(size_t filterI = 0; filterI < kernel.size(); filterI++){
for(size_t filterJ = 0; filterJ < kernel[filterI].size(); filterJ++){
//The location imageI and imageJ is calculated so that
//for the center element of the filter it'll be i, j
int imageI = (i - kernel.size()/2 + filterI + width) % width;
int imageJ = (j - kernel[filterI].size()/2 + filterJ + height) % height;
ColorData currPixel = imageBuffer -> getPixel(imageI, imageJ);
newRed += currPixel.getRed() * kernel[filterI][filterJ];
newGreen += currPixel.getGreen()*kernel[filterI][filterJ];
newBlue += currPixel.getBlue()*kernel[filterI][filterJ];
}
}
ColorData newPixel = ColorData(newRed, newGreen, newBlue);
newPixel = newPixel.clampedColor();
newImageBuffer -> setPixel(i, j, newPixel);
}
}
newImageBuffer -> copyPixelBuffer(newImageBuffer, imageBuffer);
delete newImageBuffer;
}