GUAC-726: Replace overwrite function with much saner function based on character validity checks along column edges.
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@ -63,66 +63,69 @@ static void __guac_terminal_set_columns(guac_terminal* terminal, int row,
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/**
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/**
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* Declares that the given range of columns within the given row is about to be
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* Enforces a character break at the given edge, ensuring that the left side
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* overwritten, and should be updated as necessary.
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* of the edge is the final column of a character, and the right side of the
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* edge is the initial column of a DIFFERENT character.
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*
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* For a character in a column N, the left edge number is N, and the right
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* edge is N+1.
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*/
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*/
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static void __guac_terminal_overwrite_columns(guac_terminal* terminal, int row, int start_column, int end_column) {
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static void __guac_terminal_force_break(guac_terminal* terminal, int row, int edge) {
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guac_terminal_buffer_row* buffer_row = guac_terminal_buffer_get_row(terminal->buffer, row, 0);
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guac_terminal_buffer_row* buffer_row = guac_terminal_buffer_get_row(terminal->buffer, row, 0);
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/* Clear out initial character */
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/* Ensure character to left of edge is unbroken */
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if (start_column > 0) {
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if (edge > 0) {
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int aligned_start_column = start_column;
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int end_column = edge - 1;
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guac_terminal_char* start_char = &(buffer_row->characters[aligned_start_column]);
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int start_column = end_column;
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/* Determine nearest aligned boundary */
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guac_terminal_char* start_char = &(buffer_row->characters[start_column]);
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while (aligned_start_column > 0 && start_char->value == GUAC_CHAR_CONTINUATION) {
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/* Determine start column */
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while (start_column >= 0 && start_char->value == GUAC_CHAR_CONTINUATION) {
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start_char--;
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start_char--;
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aligned_start_column--;
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start_column--;
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}
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}
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/* Clear up to character start */
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/* Clear character if broken */
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if (aligned_start_column != start_column) {
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if (start_char->value == GUAC_CHAR_CONTINUATION || start_char->width != start_column - end_column + 1) {
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guac_terminal_char cleared_char;
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guac_terminal_char cleared_char;
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cleared_char.value = ' ';
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cleared_char.value = ' ';
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cleared_char.attributes = start_char->attributes;
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cleared_char.attributes = start_char->attributes;
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cleared_char.width = 1;
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cleared_char.width = 1;
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__guac_terminal_set_columns(terminal, row, aligned_start_column, start_column-1, &cleared_char);
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__guac_terminal_set_columns(terminal, row, start_column, end_column, &cleared_char);
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}
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}
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}
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}
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/* Clear out final character */
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/* Ensure character to right of edge is unbroken */
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if (end_column >= 0 && end_column < buffer_row->length) {
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if (edge >= 0 && edge < buffer_row->length) {
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int aligned_end_column = end_column;
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int start_column = edge;
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guac_terminal_char* end_char = &(buffer_row->characters[aligned_end_column]);
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int end_column = start_column;
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/* If we're lucky enough to end on the beginning of a character, just use its defined width */
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guac_terminal_char* start_char = &(buffer_row->characters[start_column]);
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if (end_char->value != GUAC_CHAR_CONTINUATION)
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guac_terminal_char* end_char = &(buffer_row->characters[end_column]);
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aligned_end_column += end_char->width - 1;
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/* Otherwise, search for nearest aligned boundary */
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/* Determine end column */
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else {
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while (end_column+1 < buffer_row->length && (end_char+1)->value == GUAC_CHAR_CONTINUATION) {
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while (aligned_end_column+1 < buffer_row->length && (end_char+1)->value == GUAC_CHAR_CONTINUATION) {
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end_char++;
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end_char++;
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aligned_end_column++;
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end_column++;
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}
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}
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}
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/* Clear up to true character end */
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/* Clear character if broken */
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if (aligned_end_column != end_column) {
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if (start_char->value == GUAC_CHAR_CONTINUATION || start_char->width != start_column - end_column + 1) {
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guac_terminal_char cleared_char;
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guac_terminal_char cleared_char;
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cleared_char.value = ' ';
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cleared_char.value = ' ';
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cleared_char.attributes = end_char->attributes;
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cleared_char.attributes = end_char->attributes;
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cleared_char.width = 1;
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cleared_char.width = 1;
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__guac_terminal_set_columns(terminal, row, end_column+1, aligned_end_column, &cleared_char);
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__guac_terminal_set_columns(terminal, row, start_column, end_column, &cleared_char);
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}
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}
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@ -845,29 +848,6 @@ void guac_terminal_select_end(guac_terminal* terminal, char* string) {
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void guac_terminal_copy_columns(guac_terminal* terminal, int row,
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void guac_terminal_copy_columns(guac_terminal* terminal, int row,
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int start_column, int end_column, int offset) {
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int start_column, int end_column, int offset) {
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/*
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* Handle each resulting overwrite. Note that there are effectively TWO.
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* Handling the entire destination region as a single overwrite ignores
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* the possibility that the offset may position the source region in
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* within part of a multicolumn character.
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*
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* Consider:
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*
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* 1) The overwrite which covers only characters OUTSIDE the source region
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* 2) The overwrite which coveres only characters WITHIN the source region
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*
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* The source region does NOT necessarily begin at a character boundary.
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*/
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if (offset < 0) {
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__guac_terminal_overwrite_columns(terminal, row, start_column + offset, start_column-1);
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__guac_terminal_overwrite_columns(terminal, row, start_column, end_column + offset);
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}
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else {
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__guac_terminal_overwrite_columns(terminal, row, start_column + offset, end_column-1);
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__guac_terminal_overwrite_columns(terminal, row, end_column, end_column + offset);
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}
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guac_terminal_display_copy_columns(terminal->display, row + terminal->scroll_offset,
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guac_terminal_display_copy_columns(terminal->display, row + terminal->scroll_offset,
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start_column, end_column, offset);
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start_column, end_column, offset);
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@ -880,6 +860,10 @@ void guac_terminal_copy_columns(guac_terminal* terminal, int row,
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terminal->visible_cursor_col <= end_column)
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terminal->visible_cursor_col <= end_column)
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terminal->visible_cursor_col += offset;
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terminal->visible_cursor_col += offset;
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/* Force breaks around destination region */
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__guac_terminal_force_break(terminal, row, start_column + offset);
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__guac_terminal_force_break(terminal, row, end_column + offset + 1);
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}
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}
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void guac_terminal_copy_rows(guac_terminal* terminal,
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void guac_terminal_copy_rows(guac_terminal* terminal,
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@ -901,7 +885,6 @@ void guac_terminal_copy_rows(guac_terminal* terminal,
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void guac_terminal_set_columns(guac_terminal* terminal, int row,
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void guac_terminal_set_columns(guac_terminal* terminal, int row,
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int start_column, int end_column, guac_terminal_char* character) {
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int start_column, int end_column, guac_terminal_char* character) {
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__guac_terminal_overwrite_columns(terminal, row, start_column, end_column);
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__guac_terminal_set_columns(terminal, row, start_column, end_column, character);
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__guac_terminal_set_columns(terminal, row, start_column, end_column, character);
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/* If visible cursor in current row, preserve state */
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/* If visible cursor in current row, preserve state */
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@ -918,6 +901,10 @@ void guac_terminal_set_columns(guac_terminal* terminal, int row,
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}
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}
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/* Force breaks around destination region */
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__guac_terminal_force_break(terminal, row, start_column);
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__guac_terminal_force_break(terminal, row, end_column + 1);
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}
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}
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static void __guac_terminal_redraw_rect(guac_terminal* term, int start_row, int start_col, int end_row, int end_col) {
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static void __guac_terminal_redraw_rect(guac_terminal* term, int start_row, int start_col, int end_row, int end_col) {
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