// Converts an array of blocks back to a single 2D array
// This is the inverse of "split_into_blocks()"
// The array of blocks might represent slices or codeblocks
const Array2D merge_blocks(const BlockArray& blocks) {
// First find picture dimensions
int pictureHeight = 0;
int pictureWidth = 0;
const int yBlocks = blocks.shape()[0];
const int xBlocks = blocks.shape()[1];
for (int y=0; y<yBlocks; ++y) pictureHeight += blocks[y][0].shape()[0];
for (int x=0; x<xBlocks; ++x) pictureWidth += blocks[0][x].shape()[1];
// Define Array2D pictureHeight by PictureWidth
Array2D picture(extents[pictureHeight][pictureWidth]);
// Now merge the block together
// Note Range(top, bottom) and Range(left, right) define half open ranges either
// [top, bottom) or [left, right), i.e. the bottom/rightmost element is not included
int bottom;
for (int y=0, top=0;
y<yBlocks;
++y, top=bottom) {
bottom = top + blocks[y][0].shape()[0];
int right;
for (int x=0, left=0;
x<xBlocks;
++x, left=right) {
right = left + blocks[0][x].shape()[1];
// Copy block into a view of the picture
picture[indices[Range(top,bottom)][Range(left,right)]] = blocks[y][x];
}
}
return picture;
}
const Shape2D shape(const BlockArray& arg) {
const Shape2D result = {{static_cast<Index>(arg.shape()[0]), static_cast<Index>(arg.shape()[1])}};
return result;
}