faster resizing.

diff --git a/st.c b/st.c
index e288902..f44db79 100644 (file)
--- 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;
 }