faster resizing.

1 files changed, 9 insertions, 12 deletions

diff --git a/st.c b/st.c
index e288902..f44db79 100644
--- a/st.c
+++ b/st.c
@@ -1001,23 +1001,21 @@ tputs(char *s, int len) {
 void
 tresize(int col, int row) {
         int i;
-        Line *line;
         int minrow = MIN(row, term.row);
         int mincol = MIN(col, term.col);
 
         if(col < 1 || row < 1)
                 return;
-        /* alloc */
-        line = calloc(row, sizeof(Line));
-        for(i = 0 ; i < row; i++)
-                line[i] = calloc(col, sizeof(Glyph));
-        /* copy */
-        for(i = 0 ; i < minrow; i++)
-                memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
-        /* free */
-        for(i = 0; i < term.row; i++)
+
+        for(i = row; i < term.row; i++)
                 free(term.line[i]);
-        free(term.line);
+        term.line = realloc(term.line, row * sizeof(Line));
+        for(i = 0; i < minrow; i++) {
+                term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
+                memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
+        }
+        for(/* i == minrow */; i < row; i++)
+                term.line[i] = calloc(col, sizeof(Glyph));
         
         LIMIT(term.c.x, 0, col-1);
         LIMIT(term.c.y, 0, row-1);
@@ -1025,7 +1023,6 @@ tresize(int col, int row) {
         LIMIT(term.bot, 0, row-1);
         
         term.bot = row-1;
-        term.line = line;
         term.col = col, term.row = row;
 }