add dirty flag for lines

1 files changed, 39 insertions, 4 deletions

diff --git a/st.c b/st.c
index 72e57c8..ad6db0d 100644
--- a/st.c
+++ b/st.c
@@ -111,6 +111,7 @@ typedef struct {
         int col;        /* nb col */
         Line* line;     /* screen */
         Line* alt;      /* alternate screen */
+        char* dirty; /* dirtyness of lines */
         TCursor c;      /* cursor */
         int top;        /* top    scroll limit */
         int bot;        /* bottom scroll limit */
@@ -203,6 +204,7 @@ static void tsetattr(int*, int);
 static void tsetchar(char*);
 static void tsetscroll(int, int);
 static void tswapscreen(void);
+static void tfulldirt(void);
 
 static void ttynew(void);
 static void ttyread(void);
@@ -749,6 +751,14 @@ ttyresize(int x, int y) {
 }
 
 void
+tfulldirt(void)
+{
+        int i;
+        for(i = 0; i < term.row; i++)
+                term.dirty[i] = 1;
+}
+
+void
 tcursor(int mode) {
         static TCursor c;
 
@@ -777,9 +787,12 @@ tnew(int col, int row) {
         term.row = row, term.col = col;
         term.line = malloc(term.row * sizeof(Line));
         term.alt  = malloc(term.row * sizeof(Line));
+        term.dirty = malloc(term.row * sizeof(*term.dirty));
+
         for(row = 0; row < term.row; row++) {
                 term.line[row] = malloc(term.col * sizeof(Glyph));
                 term.alt [row] = malloc(term.col * sizeof(Glyph));
+                term.dirty[row] = 0;
         }
         /* setup screen */
         treset();
@@ -791,6 +804,7 @@ tswapscreen(void) {
         term.line = term.alt;
         term.alt = tmp;
         term.mode ^= MODE_ALTSCREEN;
+        tfulldirt();
 }
 
 void
@@ -806,6 +820,9 @@ tscrolldown(int orig, int n) {
                 temp = term.line[i];
                 term.line[i] = term.line[i-n];
                 term.line[i-n] = temp;
+
+                term.dirty[i] = 1;
+                term.dirty[i-n] = 1;
         }
 
         selscroll(orig, n);
@@ -823,6 +840,9 @@ tscrollup(int orig, int n) {
                  temp = term.line[i];
                  term.line[i] = term.line[i+n];
                  term.line[i+n] = temp;
+
+                 term.dirty[i] = 1;
+                 term.dirty[i+n] = 1;
         }
 
         selscroll(orig, -n);
@@ -896,6 +916,7 @@ tmoveto(int x, int y) {
 
 void
 tsetchar(char *c) {
+        term.dirty[term.c.y] = 1;
         term.line[term.c.y][term.c.x] = term.c.attr;
         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
@@ -915,9 +936,11 @@ tclearregion(int x1, int y1, int x2, int y2) {
         LIMIT(y1, 0, term.row-1);
         LIMIT(y2, 0, term.row-1);
 
-        for(y = y1; y <= y2; y++)
+        for(y = y1; y <= y2; y++) {
+                term.dirty[y] = 1;
                 for(x = x1; x <= x2; x++)
                         term.line[y][x].state = 0;
+        }
 }
 
 void
@@ -925,6 +948,8 @@ tdeletechar(int n) {
         int src = term.c.x + n;
         int dst = term.c.x;
         int size = term.col - src;
+        
+        term.dirty[term.c.y] = 1;
 
         if(src >= term.col) {
                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
@@ -940,6 +965,8 @@ tinsertblank(int n) {
         int dst = src + n;
         int size = term.col - dst;
 
+        term.dirty[term.c.y] = 1;
+
         if(dst >= term.col) {
                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
                 return;
@@ -1411,7 +1438,8 @@ tputc(char *c) {
                         }
                 }
         } else {
-                if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey)) sel.bx = -1;
+                if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
+                        sel.bx = -1;
                 switch(ascii) {
                 case '\t':
                         tputtab();
@@ -1479,9 +1507,11 @@ tresize(int col, int row) {
         /* resize to new height */
         term.line = realloc(term.line, row * sizeof(Line));
         term.alt  = realloc(term.alt,  row * sizeof(Line));
+        term.dirty = realloc(term.dirty, row * sizeof(*term.dirty));
 
         /* resize each row to new width, zero-pad if needed */
         for(i = 0; i < minrow; i++) {
+                term.dirty[i] = 1;
                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
                 for(x = mincol; x < col; x++) {
@@ -1492,6 +1522,7 @@ tresize(int col, int row) {
 
         /* allocate any new rows */
         for(/* i == minrow */; i < row; i++) {
+                term.dirty[i] = 1;
                 term.line[i] = calloc(col, sizeof(Glyph));
                 term.alt [i] = calloc(col, sizeof(Glyph));
         }
@@ -1502,6 +1533,7 @@ tresize(int col, int row) {
         tmoveto(term.c.x, term.c.y);
         /* reset scrolling region */
         tsetscroll(0, row-1);
+
         return (slide > 0);
 }
 
@@ -1792,8 +1824,11 @@ drawregion(int x1, int y1, int x2, int y2) {
         if(!(xw.state & WIN_VISIBLE))
                 return;
 
-        xclear(x1, y1, x2-1, y2-1);
         for(y = y1; y < y2; y++) {
+                if(!term.dirty[y])
+                        continue;
+                xclear(0, y, term.col, y);
+                term.dirty[y] = 0;
                 base = term.line[y][0];
                 ic = ib = ox = 0;
                 for(x = x1; x < x2; x++) {
@@ -1801,7 +1836,7 @@ drawregion(int x1, int y1, int x2, int y2) {
                         if(sel.bx != -1 && *(new.c) && selected(x, y))
                                 new.mode ^= ATTR_REVERSE;
                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
-                                        ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
+                                                  ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
                                 xdraws(buf, base, ox, y, ic, ib);
                                 ic = ib = 0;
                         }