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-rw-r--r--src/vterm/screen.c1202
1 files changed, 1202 insertions, 0 deletions
diff --git a/src/vterm/screen.c b/src/vterm/screen.c
new file mode 100644
index 0000000000..1f5bb36114
--- /dev/null
+++ b/src/vterm/screen.c
@@ -0,0 +1,1202 @@
+#include "vterm_internal.h"
+
+#include <stdio.h>
+#include <string.h>
+#include "nvim/mbyte.h"
+#include "nvim/tui/termkey/termkey.h"
+
+#include "rect.h"
+
+#define UNICODE_SPACE 0x20
+#define UNICODE_LINEFEED 0x0a
+
+#undef DEBUG_REFLOW
+
+/* State of the pen at some moment in time, also used in a cell */
+typedef struct
+{
+ /* After the bitfield */
+ VTermColor fg, bg;
+
+ /* Opaque ID that maps to a URI in a set */
+ int uri;
+
+ unsigned int bold : 1;
+ unsigned int underline : 2;
+ unsigned int italic : 1;
+ unsigned int blink : 1;
+ unsigned int reverse : 1;
+ unsigned int conceal : 1;
+ unsigned int strike : 1;
+ unsigned int font : 4; /* 0 to 9 */
+ unsigned int small : 1;
+ unsigned int baseline : 2;
+
+ /* Extra state storage that isn't strictly pen-related */
+ unsigned int protected_cell : 1;
+ unsigned int dwl : 1; /* on a DECDWL or DECDHL line */
+ unsigned int dhl : 2; /* on a DECDHL line (1=top 2=bottom) */
+} ScreenPen;
+
+/* Internal representation of a screen cell */
+typedef struct
+{
+ uint32_t chars[VTERM_MAX_CHARS_PER_CELL];
+ ScreenPen pen;
+} ScreenCell;
+
+struct VTermScreen
+{
+ VTerm *vt;
+ VTermState *state;
+
+ const VTermScreenCallbacks *callbacks;
+ void *cbdata;
+
+ VTermDamageSize damage_merge;
+ /* start_row == -1 => no damage */
+ VTermRect damaged;
+ VTermRect pending_scrollrect;
+ int pending_scroll_downward, pending_scroll_rightward;
+
+ int rows;
+ int cols;
+
+ unsigned int global_reverse : 1;
+ unsigned int reflow : 1;
+
+ /* Primary and Altscreen. buffers[1] is lazily allocated as needed */
+ ScreenCell *buffers[2];
+
+ /* buffer will == buffers[0] or buffers[1], depending on altscreen */
+ ScreenCell *buffer;
+
+ /* buffer for a single screen row used in scrollback storage callbacks */
+ VTermScreenCell *sb_buffer;
+
+ ScreenPen pen;
+};
+
+static inline void clearcell(const VTermScreen *screen, ScreenCell *cell)
+{
+ cell->chars[0] = 0;
+ cell->pen = screen->pen;
+}
+
+static inline ScreenCell *getcell(const VTermScreen *screen, int row, int col)
+{
+ if(row < 0 || row >= screen->rows)
+ return NULL;
+ if(col < 0 || col >= screen->cols)
+ return NULL;
+ return screen->buffer + (screen->cols * row) + col;
+}
+
+static ScreenCell *alloc_buffer(VTermScreen *screen, int rows, int cols)
+{
+ ScreenCell *new_buffer = vterm_allocator_malloc(screen->vt, sizeof(ScreenCell) * rows * cols);
+
+ for(int row = 0; row < rows; row++) {
+ for(int col = 0; col < cols; col++) {
+ clearcell(screen, &new_buffer[row * cols + col]);
+ }
+ }
+
+ return new_buffer;
+}
+
+static void damagerect(VTermScreen *screen, VTermRect rect)
+{
+ VTermRect emit;
+
+ switch(screen->damage_merge) {
+ case VTERM_DAMAGE_CELL:
+ /* Always emit damage event */
+ emit = rect;
+ break;
+
+ case VTERM_DAMAGE_ROW:
+ /* Emit damage longer than one row. Try to merge with existing damage in
+ * the same row */
+ if(rect.end_row > rect.start_row + 1) {
+ // Bigger than 1 line - flush existing, emit this
+ vterm_screen_flush_damage(screen);
+ emit = rect;
+ }
+ else if(screen->damaged.start_row == -1) {
+ // None stored yet
+ screen->damaged = rect;
+ return;
+ }
+ else if(rect.start_row == screen->damaged.start_row) {
+ // Merge with the stored line
+ if(screen->damaged.start_col > rect.start_col)
+ screen->damaged.start_col = rect.start_col;
+ if(screen->damaged.end_col < rect.end_col)
+ screen->damaged.end_col = rect.end_col;
+ return;
+ }
+ else {
+ // Emit the currently stored line, store a new one
+ emit = screen->damaged;
+ screen->damaged = rect;
+ }
+ break;
+
+ case VTERM_DAMAGE_SCREEN:
+ case VTERM_DAMAGE_SCROLL:
+ /* Never emit damage event */
+ if(screen->damaged.start_row == -1)
+ screen->damaged = rect;
+ else {
+ rect_expand(&screen->damaged, &rect);
+ }
+ return;
+
+ default:
+ DEBUG_LOG("TODO: Maybe merge damage for level %d\n", screen->damage_merge);
+ return;
+ }
+
+ if(screen->callbacks && screen->callbacks->damage)
+ (*screen->callbacks->damage)(emit, screen->cbdata);
+}
+
+static void damagescreen(VTermScreen *screen)
+{
+ VTermRect rect = {
+ .start_row = 0,
+ .end_row = screen->rows,
+ .start_col = 0,
+ .end_col = screen->cols,
+ };
+
+ damagerect(screen, rect);
+}
+
+static int putglyph(VTermGlyphInfo *info, VTermPos pos, void *user)
+{
+ VTermScreen *screen = user;
+ ScreenCell *cell = getcell(screen, pos.row, pos.col);
+
+ if(!cell)
+ return 0;
+
+ int i;
+ for(i = 0; i < VTERM_MAX_CHARS_PER_CELL && info->chars[i]; i++) {
+ cell->chars[i] = info->chars[i];
+ cell->pen = screen->pen;
+ }
+ if(i < VTERM_MAX_CHARS_PER_CELL)
+ cell->chars[i] = 0;
+
+ for(int col = 1; col < info->width; col++)
+ getcell(screen, pos.row, pos.col + col)->chars[0] = (uint32_t)-1;
+
+ VTermRect rect = {
+ .start_row = pos.row,
+ .end_row = pos.row+1,
+ .start_col = pos.col,
+ .end_col = pos.col+info->width,
+ };
+
+ cell->pen.protected_cell = info->protected_cell;
+ cell->pen.dwl = info->dwl;
+ cell->pen.dhl = info->dhl;
+
+ damagerect(screen, rect);
+
+ return 1;
+}
+
+static void sb_pushline_from_row(VTermScreen *screen, int row)
+{
+ VTermPos pos = { .row = row };
+ for(pos.col = 0; pos.col < screen->cols; pos.col++)
+ vterm_screen_get_cell(screen, pos, screen->sb_buffer + pos.col);
+
+ (screen->callbacks->sb_pushline)(screen->cols, screen->sb_buffer, screen->cbdata);
+}
+
+static int moverect_internal(VTermRect dest, VTermRect src, void *user)
+{
+ VTermScreen *screen = user;
+
+ if(screen->callbacks && screen->callbacks->sb_pushline &&
+ dest.start_row == 0 && dest.start_col == 0 && // starts top-left corner
+ dest.end_col == screen->cols && // full width
+ screen->buffer == screen->buffers[BUFIDX_PRIMARY]) { // not altscreen
+ for(int row = 0; row < src.start_row; row++)
+ sb_pushline_from_row(screen, row);
+ }
+
+ int cols = src.end_col - src.start_col;
+ int downward = src.start_row - dest.start_row;
+
+ int init_row, test_row, inc_row;
+ if(downward < 0) {
+ init_row = dest.end_row - 1;
+ test_row = dest.start_row - 1;
+ inc_row = -1;
+ }
+ else {
+ init_row = dest.start_row;
+ test_row = dest.end_row;
+ inc_row = +1;
+ }
+
+ for(int row = init_row; row != test_row; row += inc_row)
+ memmove(getcell(screen, row, dest.start_col),
+ getcell(screen, row + downward, src.start_col),
+ cols * sizeof(ScreenCell));
+
+ return 1;
+}
+
+static int moverect_user(VTermRect dest, VTermRect src, void *user)
+{
+ VTermScreen *screen = user;
+
+ if(screen->callbacks && screen->callbacks->moverect) {
+ if(screen->damage_merge != VTERM_DAMAGE_SCROLL)
+ // Avoid an infinite loop
+ vterm_screen_flush_damage(screen);
+
+ if((*screen->callbacks->moverect)(dest, src, screen->cbdata))
+ return 1;
+ }
+
+ damagerect(screen, dest);
+
+ return 1;
+}
+
+static int erase_internal(VTermRect rect, int selective, void *user)
+{
+ VTermScreen *screen = user;
+
+ for(int row = rect.start_row; row < screen->state->rows && row < rect.end_row; row++) {
+ const VTermLineInfo *info = vterm_state_get_lineinfo(screen->state, row);
+
+ for(int col = rect.start_col; col < rect.end_col; col++) {
+ ScreenCell *cell = getcell(screen, row, col);
+
+ if(selective && cell->pen.protected_cell)
+ continue;
+
+ cell->chars[0] = 0;
+ cell->pen = (ScreenPen){
+ /* Only copy .fg and .bg; leave things like rv in reset state */
+ .fg = screen->pen.fg,
+ .bg = screen->pen.bg,
+ };
+ cell->pen.dwl = info->doublewidth;
+ cell->pen.dhl = info->doubleheight;
+ }
+ }
+
+ return 1;
+}
+
+static int erase_user(VTermRect rect, int selective, void *user)
+{
+ VTermScreen *screen = user;
+
+ damagerect(screen, rect);
+
+ return 1;
+}
+
+static int erase(VTermRect rect, int selective, void *user)
+{
+ erase_internal(rect, selective, user);
+ return erase_user(rect, 0, user);
+}
+
+static int scrollrect(VTermRect rect, int downward, int rightward, void *user)
+{
+ VTermScreen *screen = user;
+
+ if(screen->damage_merge != VTERM_DAMAGE_SCROLL) {
+ vterm_scroll_rect(rect, downward, rightward,
+ moverect_internal, erase_internal, screen);
+
+ vterm_screen_flush_damage(screen);
+
+ vterm_scroll_rect(rect, downward, rightward,
+ moverect_user, erase_user, screen);
+
+ return 1;
+ }
+
+ if(screen->damaged.start_row != -1 &&
+ !rect_intersects(&rect, &screen->damaged)) {
+ vterm_screen_flush_damage(screen);
+ }
+
+ if(screen->pending_scrollrect.start_row == -1) {
+ screen->pending_scrollrect = rect;
+ screen->pending_scroll_downward = downward;
+ screen->pending_scroll_rightward = rightward;
+ }
+ else if(rect_equal(&screen->pending_scrollrect, &rect) &&
+ ((screen->pending_scroll_downward == 0 && downward == 0) ||
+ (screen->pending_scroll_rightward == 0 && rightward == 0))) {
+ screen->pending_scroll_downward += downward;
+ screen->pending_scroll_rightward += rightward;
+ }
+ else {
+ vterm_screen_flush_damage(screen);
+
+ screen->pending_scrollrect = rect;
+ screen->pending_scroll_downward = downward;
+ screen->pending_scroll_rightward = rightward;
+ }
+
+ vterm_scroll_rect(rect, downward, rightward,
+ moverect_internal, erase_internal, screen);
+
+ if(screen->damaged.start_row == -1)
+ return 1;
+
+ if(rect_contains(&rect, &screen->damaged)) {
+ /* Scroll region entirely contains the damage; just move it */
+ vterm_rect_move(&screen->damaged, -downward, -rightward);
+ rect_clip(&screen->damaged, &rect);
+ }
+ /* There are a number of possible cases here, but lets restrict this to only
+ * the common case where we might actually gain some performance by
+ * optimising it. Namely, a vertical scroll that neatly cuts the damage
+ * region in half.
+ */
+ else if(rect.start_col <= screen->damaged.start_col &&
+ rect.end_col >= screen->damaged.end_col &&
+ rightward == 0) {
+ if(screen->damaged.start_row >= rect.start_row &&
+ screen->damaged.start_row < rect.end_row) {
+ screen->damaged.start_row -= downward;
+ if(screen->damaged.start_row < rect.start_row)
+ screen->damaged.start_row = rect.start_row;
+ if(screen->damaged.start_row > rect.end_row)
+ screen->damaged.start_row = rect.end_row;
+ }
+ if(screen->damaged.end_row >= rect.start_row &&
+ screen->damaged.end_row < rect.end_row) {
+ screen->damaged.end_row -= downward;
+ if(screen->damaged.end_row < rect.start_row)
+ screen->damaged.end_row = rect.start_row;
+ if(screen->damaged.end_row > rect.end_row)
+ screen->damaged.end_row = rect.end_row;
+ }
+ }
+ else {
+ DEBUG_LOG("TODO: Just flush and redo damaged=" STRFrect " rect=" STRFrect "\n",
+ ARGSrect(screen->damaged), ARGSrect(rect));
+ }
+
+ return 1;
+}
+
+static int movecursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
+{
+ VTermScreen *screen = user;
+
+ if(screen->callbacks && screen->callbacks->movecursor)
+ return (*screen->callbacks->movecursor)(pos, oldpos, visible, screen->cbdata);
+
+ return 0;
+}
+
+static int setpenattr(VTermAttr attr, VTermValue *val, void *user)
+{
+ VTermScreen *screen = user;
+
+ switch(attr) {
+ case VTERM_ATTR_BOLD:
+ screen->pen.bold = val->boolean;
+ return 1;
+ case VTERM_ATTR_UNDERLINE:
+ screen->pen.underline = val->number;
+ return 1;
+ case VTERM_ATTR_ITALIC:
+ screen->pen.italic = val->boolean;
+ return 1;
+ case VTERM_ATTR_BLINK:
+ screen->pen.blink = val->boolean;
+ return 1;
+ case VTERM_ATTR_REVERSE:
+ screen->pen.reverse = val->boolean;
+ return 1;
+ case VTERM_ATTR_CONCEAL:
+ screen->pen.conceal = val->boolean;
+ return 1;
+ case VTERM_ATTR_STRIKE:
+ screen->pen.strike = val->boolean;
+ return 1;
+ case VTERM_ATTR_FONT:
+ screen->pen.font = val->number;
+ return 1;
+ case VTERM_ATTR_FOREGROUND:
+ screen->pen.fg = val->color;
+ return 1;
+ case VTERM_ATTR_BACKGROUND:
+ screen->pen.bg = val->color;
+ return 1;
+ case VTERM_ATTR_SMALL:
+ screen->pen.small = val->boolean;
+ return 1;
+ case VTERM_ATTR_BASELINE:
+ screen->pen.baseline = val->number;
+ return 1;
+ case VTERM_ATTR_URI:
+ screen->pen.uri = val->number;
+ return 1;
+
+ case VTERM_N_ATTRS:
+ return 0;
+ }
+
+ return 0;
+}
+
+static int settermprop(VTermProp prop, VTermValue *val, void *user)
+{
+ VTermScreen *screen = user;
+
+ switch(prop) {
+ case VTERM_PROP_ALTSCREEN:
+ if(val->boolean && !screen->buffers[BUFIDX_ALTSCREEN])
+ return 0;
+
+ screen->buffer = val->boolean ? screen->buffers[BUFIDX_ALTSCREEN] : screen->buffers[BUFIDX_PRIMARY];
+ /* only send a damage event on disable; because during enable there's an
+ * erase that sends a damage anyway
+ */
+ if(!val->boolean)
+ damagescreen(screen);
+ break;
+ case VTERM_PROP_REVERSE:
+ screen->global_reverse = val->boolean;
+ damagescreen(screen);
+ break;
+ default:
+ ; /* ignore */
+ }
+
+ if(screen->callbacks && screen->callbacks->settermprop)
+ return (*screen->callbacks->settermprop)(prop, val, screen->cbdata);
+
+ return 1;
+}
+
+static int bell(void *user)
+{
+ VTermScreen *screen = user;
+
+ if(screen->callbacks && screen->callbacks->bell)
+ return (*screen->callbacks->bell)(screen->cbdata);
+
+ return 0;
+}
+
+/* How many cells are non-blank
+ * Returns the position of the first blank cell in the trailing blank end */
+static int line_popcount(ScreenCell *buffer, int row, int rows, int cols)
+{
+ int col = cols - 1;
+ while(col >= 0 && buffer[row * cols + col].chars[0] == 0)
+ col--;
+ return col + 1;
+}
+
+static void resize_buffer(VTermScreen *screen, int bufidx, int new_rows, int new_cols, bool active, VTermStateFields *statefields)
+{
+ int old_rows = screen->rows;
+ int old_cols = screen->cols;
+
+ ScreenCell *old_buffer = screen->buffers[bufidx];
+ VTermLineInfo *old_lineinfo = statefields->lineinfos[bufidx];
+
+ ScreenCell *new_buffer = vterm_allocator_malloc(screen->vt, sizeof(ScreenCell) * new_rows * new_cols);
+ VTermLineInfo *new_lineinfo = vterm_allocator_malloc(screen->vt, sizeof(new_lineinfo[0]) * new_rows);
+
+ int old_row = old_rows - 1;
+ int new_row = new_rows - 1;
+
+ VTermPos old_cursor = statefields->pos;
+ VTermPos new_cursor = { -1, -1 };
+
+#ifdef DEBUG_REFLOW
+ fprintf(stderr, "Resizing from %dx%d to %dx%d; cursor was at (%d,%d)\n",
+ old_cols, old_rows, new_cols, new_rows, old_cursor.col, old_cursor.row);
+#endif
+
+ /* Keep track of the final row that is knonw to be blank, so we know what
+ * spare space we have for scrolling into
+ */
+ int final_blank_row = new_rows;
+
+ while(old_row >= 0) {
+ int old_row_end = old_row;
+ /* TODO: Stop if dwl or dhl */
+ while(screen->reflow && old_lineinfo && old_row > 0 && old_lineinfo[old_row].continuation)
+ old_row--;
+ int old_row_start = old_row;
+
+ int width = 0;
+ for(int row = old_row_start; row <= old_row_end; row++) {
+ if(screen->reflow && row < (old_rows - 1) && old_lineinfo[row + 1].continuation)
+ width += old_cols;
+ else
+ width += line_popcount(old_buffer, row, old_rows, old_cols);
+ }
+
+ if(final_blank_row == (new_row + 1) && width == 0)
+ final_blank_row = new_row;
+
+ int new_height = screen->reflow
+ ? width ? (width + new_cols - 1) / new_cols : 1
+ : 1;
+
+ int new_row_end = new_row;
+ int new_row_start = new_row - new_height + 1;
+
+ old_row = old_row_start;
+ int old_col = 0;
+
+ int spare_rows = new_rows - final_blank_row;
+
+ if(new_row_start < 0 && /* we'd fall off the top */
+ spare_rows >= 0 && /* we actually have spare rows */
+ (!active || new_cursor.row == -1 || (new_cursor.row - new_row_start) < new_rows))
+ {
+ /* Attempt to scroll content down into the blank rows at the bottom to
+ * make it fit
+ */
+ int downwards = -new_row_start;
+ if(downwards > spare_rows)
+ downwards = spare_rows;
+ int rowcount = new_rows - downwards;
+
+#ifdef DEBUG_REFLOW
+ fprintf(stderr, " scroll %d rows +%d downwards\n", rowcount, downwards);
+#endif
+
+ memmove(&new_buffer[downwards * new_cols], &new_buffer[0], (unsigned long) rowcount * new_cols * sizeof(ScreenCell));
+ memmove(&new_lineinfo[downwards], &new_lineinfo[0], rowcount * sizeof(new_lineinfo[0]));
+
+ new_row += downwards;
+ new_row_start += downwards;
+ new_row_end += downwards;
+
+ if(new_cursor.row >= 0)
+ new_cursor.row += downwards;
+
+ final_blank_row += downwards;
+ }
+
+#ifdef DEBUG_REFLOW
+ fprintf(stderr, " rows [%d..%d] <- [%d..%d] width=%d\n",
+ new_row_start, new_row_end, old_row_start, old_row_end, width);
+#endif
+
+ if(new_row_start < 0) {
+ if(old_row_start <= old_cursor.row && old_cursor.row <= old_row_end) {
+ new_cursor.row = 0;
+ new_cursor.col = old_cursor.col;
+ if(new_cursor.col >= new_cols)
+ new_cursor.col = new_cols-1;
+ }
+ break;
+ }
+
+ for(new_row = new_row_start, old_row = old_row_start; new_row <= new_row_end; new_row++) {
+ int count = width >= new_cols ? new_cols : width;
+ width -= count;
+
+ int new_col = 0;
+
+ while(count) {
+ /* TODO: This could surely be done a lot faster by memcpy()'ing the entire range */
+ new_buffer[new_row * new_cols + new_col] = old_buffer[old_row * old_cols + old_col];
+
+ if(old_cursor.row == old_row && old_cursor.col == old_col)
+ new_cursor.row = new_row, new_cursor.col = new_col;
+
+ old_col++;
+ if(old_col == old_cols) {
+ old_row++;
+
+ if(!screen->reflow) {
+ new_col++;
+ break;
+ }
+ old_col = 0;
+ }
+
+ new_col++;
+ count--;
+ }
+
+ if(old_cursor.row == old_row && old_cursor.col >= old_col) {
+ new_cursor.row = new_row, new_cursor.col = (old_cursor.col - old_col + new_col);
+ if(new_cursor.col >= new_cols)
+ new_cursor.col = new_cols-1;
+ }
+
+ while(new_col < new_cols) {
+ clearcell(screen, &new_buffer[new_row * new_cols + new_col]);
+ new_col++;
+ }
+
+ new_lineinfo[new_row].continuation = (new_row > new_row_start);
+ }
+
+ old_row = old_row_start - 1;
+ new_row = new_row_start - 1;
+ }
+
+ if(old_cursor.row <= old_row) {
+ /* cursor would have moved entirely off the top of the screen; lets just
+ * bring it within range */
+ new_cursor.row = 0, new_cursor.col = old_cursor.col;
+ if(new_cursor.col >= new_cols)
+ new_cursor.col = new_cols-1;
+ }
+
+ /* We really expect the cursor position to be set by now */
+ if(active && (new_cursor.row == -1 || new_cursor.col == -1)) {
+ fprintf(stderr, "screen_resize failed to update cursor position\n");
+ abort();
+ }
+
+ if(old_row >= 0 && bufidx == BUFIDX_PRIMARY) {
+ /* Push spare lines to scrollback buffer */
+ if(screen->callbacks && screen->callbacks->sb_pushline)
+ for(int row = 0; row <= old_row; row++)
+ sb_pushline_from_row(screen, row);
+ if(active)
+ statefields->pos.row -= (old_row + 1);
+ }
+ if(new_row >= 0 && bufidx == BUFIDX_PRIMARY &&
+ screen->callbacks && screen->callbacks->sb_popline) {
+ /* Try to backfill rows by popping scrollback buffer */
+ while(new_row >= 0) {
+ if(!(screen->callbacks->sb_popline(old_cols, screen->sb_buffer, screen->cbdata)))
+ break;
+
+ VTermPos pos = { .row = new_row };
+ for(pos.col = 0; pos.col < old_cols && pos.col < new_cols; pos.col += screen->sb_buffer[pos.col].width) {
+ VTermScreenCell *src = &screen->sb_buffer[pos.col];
+ ScreenCell *dst = &new_buffer[pos.row * new_cols + pos.col];
+
+ for(int i = 0; i < VTERM_MAX_CHARS_PER_CELL; i++) {
+ dst->chars[i] = src->chars[i];
+ if(!src->chars[i])
+ break;
+ }
+
+ dst->pen.bold = src->attrs.bold;
+ dst->pen.underline = src->attrs.underline;
+ dst->pen.italic = src->attrs.italic;
+ dst->pen.blink = src->attrs.blink;
+ dst->pen.reverse = src->attrs.reverse ^ screen->global_reverse;
+ dst->pen.conceal = src->attrs.conceal;
+ dst->pen.strike = src->attrs.strike;
+ dst->pen.font = src->attrs.font;
+ dst->pen.small = src->attrs.small;
+ dst->pen.baseline = src->attrs.baseline;
+
+ dst->pen.fg = src->fg;
+ dst->pen.bg = src->bg;
+
+ dst->pen.uri = src->uri;
+
+ if(src->width == 2 && pos.col < (new_cols-1))
+ (dst + 1)->chars[0] = (uint32_t) -1;
+ }
+ for( ; pos.col < new_cols; pos.col++)
+ clearcell(screen, &new_buffer[pos.row * new_cols + pos.col]);
+ new_row--;
+
+ if(active)
+ statefields->pos.row++;
+ }
+ }
+ if(new_row >= 0) {
+ /* Scroll new rows back up to the top and fill in blanks at the bottom */
+ int moverows = new_rows - new_row - 1;
+ memmove(&new_buffer[0], &new_buffer[(new_row + 1) * new_cols], (unsigned long) moverows * new_cols * sizeof(ScreenCell));
+ memmove(&new_lineinfo[0], &new_lineinfo[new_row + 1], moverows * sizeof(new_lineinfo[0]));
+
+ new_cursor.row -= (new_row + 1);
+
+ for(new_row = moverows; new_row < new_rows; new_row++) {
+ for(int col = 0; col < new_cols; col++)
+ clearcell(screen, &new_buffer[new_row * new_cols + col]);
+ new_lineinfo[new_row] = (VTermLineInfo){ 0 };
+ }
+ }
+
+ vterm_allocator_free(screen->vt, old_buffer);
+ screen->buffers[bufidx] = new_buffer;
+
+ vterm_allocator_free(screen->vt, old_lineinfo);
+ statefields->lineinfos[bufidx] = new_lineinfo;
+
+ if(active)
+ statefields->pos = new_cursor;
+
+ return;
+}
+
+static int resize(int new_rows, int new_cols, VTermStateFields *fields, void *user)
+{
+ VTermScreen *screen = user;
+
+ int altscreen_active = (screen->buffers[BUFIDX_ALTSCREEN] && screen->buffer == screen->buffers[BUFIDX_ALTSCREEN]);
+
+ int old_rows = screen->rows;
+ int old_cols = screen->cols;
+
+ if(new_cols > old_cols) {
+ /* Ensure that ->sb_buffer is large enough for a new or and old row */
+ if(screen->sb_buffer)
+ vterm_allocator_free(screen->vt, screen->sb_buffer);
+
+ screen->sb_buffer = vterm_allocator_malloc(screen->vt, sizeof(VTermScreenCell) * new_cols);
+ }
+
+ resize_buffer(screen, 0, new_rows, new_cols, !altscreen_active, fields);
+ if(screen->buffers[BUFIDX_ALTSCREEN])
+ resize_buffer(screen, 1, new_rows, new_cols, altscreen_active, fields);
+ else if(new_rows != old_rows) {
+ /* We don't need a full resize of the altscreen because it isn't enabled
+ * but we should at least keep the lineinfo the right size */
+ vterm_allocator_free(screen->vt, fields->lineinfos[BUFIDX_ALTSCREEN]);
+
+ VTermLineInfo *new_lineinfo = vterm_allocator_malloc(screen->vt, sizeof(new_lineinfo[0]) * new_rows);
+ for(int row = 0; row < new_rows; row++)
+ new_lineinfo[row] = (VTermLineInfo){ 0 };
+
+ fields->lineinfos[BUFIDX_ALTSCREEN] = new_lineinfo;
+ }
+
+ screen->buffer = altscreen_active ? screen->buffers[BUFIDX_ALTSCREEN] : screen->buffers[BUFIDX_PRIMARY];
+
+ screen->rows = new_rows;
+ screen->cols = new_cols;
+
+ if(new_cols <= old_cols) {
+ if(screen->sb_buffer)
+ vterm_allocator_free(screen->vt, screen->sb_buffer);
+
+ screen->sb_buffer = vterm_allocator_malloc(screen->vt, sizeof(VTermScreenCell) * new_cols);
+ }
+
+ /* TODO: Maaaaybe we can optimise this if there's no reflow happening */
+ damagescreen(screen);
+
+ if(screen->callbacks && screen->callbacks->resize)
+ return (*screen->callbacks->resize)(new_rows, new_cols, screen->cbdata);
+
+ return 1;
+}
+
+static int setlineinfo(int row, const VTermLineInfo *newinfo, const VTermLineInfo *oldinfo, void *user)
+{
+ VTermScreen *screen = user;
+
+ if(newinfo->doublewidth != oldinfo->doublewidth ||
+ newinfo->doubleheight != oldinfo->doubleheight) {
+ for(int col = 0; col < screen->cols; col++) {
+ ScreenCell *cell = getcell(screen, row, col);
+ cell->pen.dwl = newinfo->doublewidth;
+ cell->pen.dhl = newinfo->doubleheight;
+ }
+
+ VTermRect rect = {
+ .start_row = row,
+ .end_row = row + 1,
+ .start_col = 0,
+ .end_col = newinfo->doublewidth ? screen->cols / 2 : screen->cols,
+ };
+ damagerect(screen, rect);
+
+ if(newinfo->doublewidth) {
+ rect.start_col = screen->cols / 2;
+ rect.end_col = screen->cols;
+
+ erase_internal(rect, 0, user);
+ }
+ }
+
+ return 1;
+}
+
+static int sb_clear(void *user) {
+ VTermScreen *screen = user;
+
+ if(screen->callbacks && screen->callbacks->sb_clear)
+ if((*screen->callbacks->sb_clear)(screen->cbdata))
+ return 1;
+
+ return 0;
+}
+
+static VTermStateCallbacks state_cbs = {
+ .putglyph = &putglyph,
+ .movecursor = &movecursor,
+ .scrollrect = &scrollrect,
+ .erase = &erase,
+ .setpenattr = &setpenattr,
+ .settermprop = &settermprop,
+ .bell = &bell,
+ .resize = &resize,
+ .setlineinfo = &setlineinfo,
+ .sb_clear = &sb_clear,
+};
+
+static VTermScreen *screen_new(VTerm *vt)
+{
+ VTermState *state = vterm_obtain_state(vt);
+ if(!state)
+ return NULL;
+
+ VTermScreen *screen = vterm_allocator_malloc(vt, sizeof(VTermScreen));
+ int rows, cols;
+
+ vterm_get_size(vt, &rows, &cols);
+
+ screen->vt = vt;
+ screen->state = state;
+
+ screen->damage_merge = VTERM_DAMAGE_CELL;
+ screen->damaged.start_row = -1;
+ screen->pending_scrollrect.start_row = -1;
+
+ screen->rows = rows;
+ screen->cols = cols;
+
+ screen->global_reverse = false;
+ screen->reflow = false;
+
+ screen->callbacks = NULL;
+ screen->cbdata = NULL;
+
+ screen->buffers[BUFIDX_PRIMARY] = alloc_buffer(screen, rows, cols);
+
+ screen->buffer = screen->buffers[BUFIDX_PRIMARY];
+
+ screen->sb_buffer = vterm_allocator_malloc(screen->vt, sizeof(VTermScreenCell) * cols);
+
+ vterm_state_set_callbacks(screen->state, &state_cbs, screen);
+
+ return screen;
+}
+
+INTERNAL void vterm_screen_free(VTermScreen *screen)
+{
+ vterm_allocator_free(screen->vt, screen->buffers[BUFIDX_PRIMARY]);
+ if(screen->buffers[BUFIDX_ALTSCREEN])
+ vterm_allocator_free(screen->vt, screen->buffers[BUFIDX_ALTSCREEN]);
+
+ vterm_allocator_free(screen->vt, screen->sb_buffer);
+
+ vterm_allocator_free(screen->vt, screen);
+}
+
+void vterm_screen_reset(VTermScreen *screen, int hard)
+{
+ screen->damaged.start_row = -1;
+ screen->pending_scrollrect.start_row = -1;
+ vterm_state_reset(screen->state, hard);
+ vterm_screen_flush_damage(screen);
+}
+
+static size_t _get_chars(const VTermScreen *screen, const int utf8, void *buffer, size_t len, const VTermRect rect)
+{
+ size_t outpos = 0;
+ int padding = 0;
+
+#define PUT(c) \
+ if(utf8) { \
+ size_t thislen = utf_char2len(c); \
+ if(buffer && outpos + thislen <= len) \
+ outpos += fill_utf8((c), (char *)buffer + outpos); \
+ else \
+ outpos += thislen; \
+ } \
+ else { \
+ if(buffer && outpos + 1 <= len) \
+ ((uint32_t*)buffer)[outpos++] = (c); \
+ else \
+ outpos++; \
+ }
+
+ for(int row = rect.start_row; row < rect.end_row; row++) {
+ for(int col = rect.start_col; col < rect.end_col; col++) {
+ ScreenCell *cell = getcell(screen, row, col);
+
+ if(cell->chars[0] == 0)
+ // Erased cell, might need a space
+ padding++;
+ else if(cell->chars[0] == (uint32_t)-1)
+ // Gap behind a double-width char, do nothing
+ ;
+ else {
+ while(padding) {
+ PUT(UNICODE_SPACE);
+ padding--;
+ }
+ for(int i = 0; i < VTERM_MAX_CHARS_PER_CELL && cell->chars[i]; i++) {
+ PUT(cell->chars[i]);
+ }
+ }
+ }
+
+ if(row < rect.end_row - 1) {
+ PUT(UNICODE_LINEFEED);
+ padding = 0;
+ }
+ }
+
+ return outpos;
+}
+
+size_t vterm_screen_get_chars(const VTermScreen *screen, uint32_t *chars, size_t len, const VTermRect rect)
+{
+ return _get_chars(screen, 0, chars, len, rect);
+}
+
+size_t vterm_screen_get_text(const VTermScreen *screen, char *str, size_t len, const VTermRect rect)
+{
+ return _get_chars(screen, 1, str, len, rect);
+}
+
+/* Copy internal to external representation of a screen cell */
+int vterm_screen_get_cell(const VTermScreen *screen, VTermPos pos, VTermScreenCell *cell)
+{
+ ScreenCell *intcell = getcell(screen, pos.row, pos.col);
+ if(!intcell)
+ return 0;
+
+ for(int i = 0; i < VTERM_MAX_CHARS_PER_CELL; i++) {
+ cell->chars[i] = intcell->chars[i];
+ if(!intcell->chars[i])
+ break;
+ }
+
+ cell->attrs.bold = intcell->pen.bold;
+ cell->attrs.underline = intcell->pen.underline;
+ cell->attrs.italic = intcell->pen.italic;
+ cell->attrs.blink = intcell->pen.blink;
+ cell->attrs.reverse = intcell->pen.reverse ^ screen->global_reverse;
+ cell->attrs.conceal = intcell->pen.conceal;
+ cell->attrs.strike = intcell->pen.strike;
+ cell->attrs.font = intcell->pen.font;
+ cell->attrs.small = intcell->pen.small;
+ cell->attrs.baseline = intcell->pen.baseline;
+
+ cell->attrs.dwl = intcell->pen.dwl;
+ cell->attrs.dhl = intcell->pen.dhl;
+
+ cell->fg = intcell->pen.fg;
+ cell->bg = intcell->pen.bg;
+
+ cell->uri = intcell->pen.uri;
+
+ if(pos.col < (screen->cols - 1) &&
+ getcell(screen, pos.row, pos.col + 1)->chars[0] == (uint32_t)-1)
+ cell->width = 2;
+ else
+ cell->width = 1;
+
+ return 1;
+}
+
+int vterm_screen_is_eol(const VTermScreen *screen, VTermPos pos)
+{
+ /* This cell is EOL if this and every cell to the right is black */
+ for(; pos.col < screen->cols; pos.col++) {
+ ScreenCell *cell = getcell(screen, pos.row, pos.col);
+ if(cell->chars[0] != 0)
+ return 0;
+ }
+
+ return 1;
+}
+
+VTermScreen *vterm_obtain_screen(VTerm *vt)
+{
+ if(vt->screen)
+ return vt->screen;
+
+ VTermScreen *screen = screen_new(vt);
+ vt->screen = screen;
+
+ return screen;
+}
+
+void vterm_screen_enable_reflow(VTermScreen *screen, bool reflow)
+{
+ screen->reflow = reflow;
+}
+
+#undef vterm_screen_set_reflow
+void vterm_screen_set_reflow(VTermScreen *screen, bool reflow)
+{
+ vterm_screen_enable_reflow(screen, reflow);
+}
+
+void vterm_screen_enable_altscreen(VTermScreen *screen, int altscreen)
+{
+ if(!screen->buffers[BUFIDX_ALTSCREEN] && altscreen) {
+ int rows, cols;
+ vterm_get_size(screen->vt, &rows, &cols);
+
+ screen->buffers[BUFIDX_ALTSCREEN] = alloc_buffer(screen, rows, cols);
+ }
+}
+
+void vterm_screen_set_callbacks(VTermScreen *screen, const VTermScreenCallbacks *callbacks, void *user)
+{
+ screen->callbacks = callbacks;
+ screen->cbdata = user;
+}
+
+void *vterm_screen_get_cbdata(VTermScreen *screen)
+{
+ return screen->cbdata;
+}
+
+void vterm_screen_set_unrecognised_fallbacks(VTermScreen *screen, const VTermStateFallbacks *fallbacks, void *user)
+{
+ vterm_state_set_unrecognised_fallbacks(screen->state, fallbacks, user);
+}
+
+void *vterm_screen_get_unrecognised_fbdata(VTermScreen *screen)
+{
+ return vterm_state_get_unrecognised_fbdata(screen->state);
+}
+
+void vterm_screen_flush_damage(VTermScreen *screen)
+{
+ if(screen->pending_scrollrect.start_row != -1) {
+ vterm_scroll_rect(screen->pending_scrollrect, screen->pending_scroll_downward, screen->pending_scroll_rightward,
+ moverect_user, erase_user, screen);
+
+ screen->pending_scrollrect.start_row = -1;
+ }
+
+ if(screen->damaged.start_row != -1) {
+ if(screen->callbacks && screen->callbacks->damage)
+ (*screen->callbacks->damage)(screen->damaged, screen->cbdata);
+
+ screen->damaged.start_row = -1;
+ }
+}
+
+void vterm_screen_set_damage_merge(VTermScreen *screen, VTermDamageSize size)
+{
+ vterm_screen_flush_damage(screen);
+ screen->damage_merge = size;
+}
+
+static int attrs_differ(VTermAttrMask attrs, ScreenCell *a, ScreenCell *b)
+{
+ if((attrs & VTERM_ATTR_BOLD_MASK) && (a->pen.bold != b->pen.bold))
+ return 1;
+ if((attrs & VTERM_ATTR_UNDERLINE_MASK) && (a->pen.underline != b->pen.underline))
+ return 1;
+ if((attrs & VTERM_ATTR_ITALIC_MASK) && (a->pen.italic != b->pen.italic))
+ return 1;
+ if((attrs & VTERM_ATTR_BLINK_MASK) && (a->pen.blink != b->pen.blink))
+ return 1;
+ if((attrs & VTERM_ATTR_REVERSE_MASK) && (a->pen.reverse != b->pen.reverse))
+ return 1;
+ if((attrs & VTERM_ATTR_CONCEAL_MASK) && (a->pen.conceal != b->pen.conceal))
+ return 1;
+ if((attrs & VTERM_ATTR_STRIKE_MASK) && (a->pen.strike != b->pen.strike))
+ return 1;
+ if((attrs & VTERM_ATTR_FONT_MASK) && (a->pen.font != b->pen.font))
+ return 1;
+ if((attrs & VTERM_ATTR_FOREGROUND_MASK) && !vterm_color_is_equal(&a->pen.fg, &b->pen.fg))
+ return 1;
+ if((attrs & VTERM_ATTR_BACKGROUND_MASK) && !vterm_color_is_equal(&a->pen.bg, &b->pen.bg))
+ return 1;
+ if((attrs & VTERM_ATTR_SMALL_MASK) && (a->pen.small != b->pen.small))
+ return 1;
+ if((attrs & VTERM_ATTR_BASELINE_MASK) && (a->pen.baseline != b->pen.baseline))
+ return 1;
+ if((attrs & VTERM_ATTR_URI_MASK) && (a->pen.uri != b->pen.uri))
+ return 1;
+
+ return 0;
+}
+
+int vterm_screen_get_attrs_extent(const VTermScreen *screen, VTermRect *extent, VTermPos pos, VTermAttrMask attrs)
+{
+ ScreenCell *target = getcell(screen, pos.row, pos.col);
+
+ // TODO: bounds check
+ extent->start_row = pos.row;
+ extent->end_row = pos.row + 1;
+
+ if(extent->start_col < 0)
+ extent->start_col = 0;
+ if(extent->end_col < 0)
+ extent->end_col = screen->cols;
+
+ int col;
+
+ for(col = pos.col - 1; col >= extent->start_col; col--)
+ if(attrs_differ(attrs, target, getcell(screen, pos.row, col)))
+ break;
+ extent->start_col = col + 1;
+
+ for(col = pos.col + 1; col < extent->end_col; col++)
+ if(attrs_differ(attrs, target, getcell(screen, pos.row, col)))
+ break;
+ extent->end_col = col - 1;
+
+ return 1;
+}
+
+void vterm_screen_convert_color_to_rgb(const VTermScreen *screen, VTermColor *col)
+{
+ vterm_state_convert_color_to_rgb(screen->state, col);
+}
+
+static void reset_default_colours(VTermScreen *screen, ScreenCell *buffer)
+{
+ for(int row = 0; row <= screen->rows - 1; row++)
+ for(int col = 0; col <= screen->cols - 1; col++) {
+ ScreenCell *cell = &buffer[row * screen->cols + col];
+ if(VTERM_COLOR_IS_DEFAULT_FG(&cell->pen.fg))
+ cell->pen.fg = screen->pen.fg;
+ if(VTERM_COLOR_IS_DEFAULT_BG(&cell->pen.bg))
+ cell->pen.bg = screen->pen.bg;
+ }
+}
+
+void vterm_screen_set_default_colors(VTermScreen *screen, const VTermColor *default_fg, const VTermColor *default_bg)
+{
+ vterm_state_set_default_colors(screen->state, default_fg, default_bg);
+
+ if(default_fg && VTERM_COLOR_IS_DEFAULT_FG(&screen->pen.fg)) {
+ screen->pen.fg = *default_fg;
+ screen->pen.fg.type = (screen->pen.fg.type & ~VTERM_COLOR_DEFAULT_MASK)
+ | VTERM_COLOR_DEFAULT_FG;
+ }
+
+ if(default_bg && VTERM_COLOR_IS_DEFAULT_BG(&screen->pen.bg)) {
+ screen->pen.bg = *default_bg;
+ screen->pen.bg.type = (screen->pen.bg.type & ~VTERM_COLOR_DEFAULT_MASK)
+ | VTERM_COLOR_DEFAULT_BG;
+ }
+
+ reset_default_colours(screen, screen->buffers[0]);
+ if(screen->buffers[1])
+ reset_default_colours(screen, screen->buffers[1]);
+}
generated by cgit (git 2.34.1) at 2025-04-28 20:58:32 +0000