- added libdrawtext

[demo_prior] / src / imtk / layout.c

diff --git a/src/imtk/layout.c b/src/imtk/layout.c
new file mode 100644 (file)
index 0000000..098bf53
--- /dev/null
+++ b/src/imtk/layout.c
@@ -0,0 +1,101 @@
+#include <string.h>
+#include <assert.h>
+#include "imtk.h"
+
+struct layout {
+       int box[4], span[4];
+       int spacing;
+       int dir;
+};
+
+#define MAX_STACK_DEPTH                4
+static struct layout st[MAX_STACK_DEPTH];
+static int top = 0;
+
+int imtk_layout_push(void)
+{
+       int newtop = top + 1;
+
+       assert(newtop < MAX_STACK_DEPTH);
+       if(newtop >= MAX_STACK_DEPTH) {
+               return -1;
+       }
+
+       st[newtop] = st[top++];
+       return 0;
+}
+
+int imtk_layout_pop(void)
+{
+       assert(top > 0);
+       if(top <= 0) {
+               return -1;
+       }
+       top--;
+       return 0;
+}
+
+void imtk_layout_start(int x, int y)
+{
+       st[top].box[0] = st[top].span[0] = x;
+       st[top].box[1] = st[top].span[1] = y;
+       st[top].box[2] = st[top].box[3] = st[top].span[2] = st[top].span[3] = 0;
+/*     st[top].spacing = sp;
+       st[top].dir = dir;*/
+}
+
+void imtk_layout_dir(int dir)
+{
+       st[top].dir = dir;
+       if(dir == IMTK_VERTICAL) {
+               imtk_layout_newline();
+       }
+}
+
+void imtk_layout_spacing(int spacing)
+{
+       st[top].spacing = spacing;
+}
+
+void imtk_layout_advance(int width, int height)
+{
+       int max_span_y, max_box_y;
+
+       st[top].span[2] += width + st[top].spacing;
+
+       if(height > st[top].span[3]) {
+               st[top].span[3] = height;
+       }
+
+       max_span_y = st[top].span[1] + st[top].span[3];
+       max_box_y = st[top].box[1] + st[top].box[3];
+
+       if(max_span_y > max_box_y) {
+               st[top].box[3] = max_span_y - st[top].box[1];
+       }
+       if(st[top].span[2] > st[top].box[2]) {
+               st[top].box[2] = st[top].span[2];
+       }
+
+       if(st[top].dir == IMTK_VERTICAL) {
+               imtk_layout_newline();
+       }
+}
+
+void imtk_layout_newline(void)
+{
+       st[top].span[0] = st[top].box[0];
+       st[top].span[1] = st[top].box[1] + st[top].box[3] + st[top].spacing;
+       st[top].span[2] = st[top].span[3] = 0;
+}
+
+void imtk_layout_get_pos(int *x, int *y)
+{
+       *x = st[top].span[0] + st[top].span[2];
+       *y = st[top].span[1];
+}
+
+void imtk_layout_get_bounds(int *bbox)
+{
+       memcpy(bbox, st[top].box, sizeof st[top].box);
+}