unsigned int
position_to_page_number(zathura_document_t* document, double pos_x,
double pos_y)
{
g_return_val_if_fail(document != NULL, 0);
unsigned int doc_width, doc_height;
zathura_document_get_document_size(document, &doc_height, &doc_width);
unsigned int cell_width, cell_height;
zathura_document_get_cell_size(document, &cell_height, &cell_width);
unsigned int c0 = zathura_document_get_first_page_column(document);
unsigned int npag = zathura_document_get_number_of_pages(document);
unsigned int ncol = zathura_document_get_pages_per_row(document);
unsigned int nrow = (npag + c0 - 1 + ncol - 1) / ncol; /* number of rows */
unsigned int pad = zathura_document_get_page_padding(document);
unsigned int col = floor(pos_x * (double)doc_width / (double)(cell_width + pad));
unsigned int row = floor(pos_y * (double)doc_height / (double)(cell_height + pad));
unsigned int page = ncol * (row % nrow) + (col % ncol);
if (page < c0 - 1) {
return 0;
} else {
return page - (c0 - 1);
}
}
void
zathura_document_get_document_size(zathura_document_t* document,
unsigned int* height, unsigned int* width)
{
g_return_if_fail(document != NULL && height != NULL && width != NULL);
const unsigned int npag = zathura_document_get_number_of_pages(document);
const unsigned int ncol = zathura_document_get_pages_per_row(document);
const unsigned int c0 = zathura_document_get_first_page_column(document);
const unsigned int nrow = (npag + c0 - 1 + ncol - 1) / ncol; /* number of rows */
const unsigned int pad = zathura_document_get_page_padding(document);
unsigned int cell_height = 0;
unsigned int cell_width = 0;
zathura_document_get_cell_size(document, &cell_height, &cell_width);
*width = ncol * cell_width + (ncol - 1) * pad;
*height = nrow * cell_height + (nrow - 1) * pad;
}
void
page_number_to_position(zathura_document_t* document, unsigned int page_number,
double xalign, double yalign, double* pos_x,
double* pos_y)
{
g_return_if_fail(document != NULL);
unsigned int c0 = zathura_document_get_first_page_column(document);
unsigned int npag = zathura_document_get_number_of_pages(document);
unsigned int ncol = zathura_document_get_pages_per_row(document);
unsigned int nrow = (npag + c0 - 1 + ncol - 1) / ncol; /* number of rows */
/* row and column for page_number indexed from 0 */
unsigned int row = (page_number + c0 - 1) / ncol;
unsigned int col = (page_number + c0 - 1) % ncol;
/* sizes of page cell, viewport and document */
unsigned int cell_height = 0, cell_width = 0;
zathura_document_get_cell_size(document, &cell_height, &cell_width);
unsigned int view_height = 0, view_width = 0;
zathura_document_get_viewport_size(document, &view_height, &view_width);
unsigned int doc_height = 0, doc_width = 0;
zathura_document_get_document_size(document, &doc_height, &doc_width);
/* compute the shift to align to the viewport. If the page fits to viewport, just center it. */
double shift_x = 0.5, shift_y = 0.5;
if (cell_width > view_width) {
shift_x = 0.5 + (xalign - 0.5) * ((double)cell_width - (double)view_width) / (double)cell_width;
}
if (cell_height > view_height) {
shift_y = 0.5 + (yalign - 0.5) * ((double)cell_height - (double)view_height) / (double)cell_height;
}
/* compute the position */
*pos_x = ((double)col + shift_x) / (double)ncol;
*pos_y = ((double)row + shift_y) / (double)nrow;
}
unsigned int
position_to_page_number(zathura_document_t* document, double pos_x,
double pos_y)
{
g_return_val_if_fail(document != NULL, 0);
unsigned int doc_width, doc_height;
zathura_document_get_document_size(document, &doc_height, &doc_width);
unsigned int cell_width, cell_height;
zathura_document_get_cell_size(document, &cell_height, &cell_width);
unsigned int c0 = zathura_document_get_first_page_column(document);
unsigned int npag = zathura_document_get_number_of_pages(document);
unsigned int ncol = zathura_document_get_pages_per_row(document);
unsigned int nrow = 0;
unsigned int pad = zathura_document_get_page_padding(document);
if (c0 == 1) {
/* There is no offset, so this is easy. */
nrow = (npag + ncol - 1) / ncol;
} else {
/* If there is a offset, we handle the first row extra. */
nrow = 1 + (npag - (ncol - c0 - 1) + (ncol - 1)) / ncol;
}
unsigned int col = floor(pos_x * (double)doc_width / (double)(cell_width + pad));
unsigned int row = floor(pos_y * (double)doc_height / (double)(cell_height + pad));
unsigned int page = ncol * (row % nrow) + (col % ncol);
if (page < c0 - 1) {
return 0;
} else {
return MIN(page - (c0 - 1), npag - 1);
}
}
