nuclear@23: #include <string.h>
nuclear@23: #include "imtk.h"
nuclear@23: 
nuclear@23: struct layout {
nuclear@23: 	int box[4], span[4];
nuclear@23: 	int spacing;
nuclear@23: 	int dir;
nuclear@23: };
nuclear@23: 
nuclear@23: #define MAX_STACK_DEPTH		4
nuclear@23: static struct layout st[MAX_STACK_DEPTH];
nuclear@23: static int top = 0;
nuclear@23: 
nuclear@23: int imtk_layout_push(void)
nuclear@23: {
nuclear@23: 	int newtop = top + 1;
nuclear@23: 
nuclear@23: 	assert(newtop < MAX_STACK_DEPTH);
nuclear@23: 	if(newtop >= MAX_STACK_DEPTH) {
nuclear@23: 		return -1;
nuclear@23: 	}
nuclear@23: 
nuclear@23: 	st[newtop] = st[top++];
nuclear@23: 	return 0;
nuclear@23: }
nuclear@23: 
nuclear@23: int imtk_layout_pop(void)
nuclear@23: {
nuclear@23: 	assert(top > 0);
nuclear@23: 	if(top <= 0) {
nuclear@23: 		return -1;
nuclear@23: 	}
nuclear@23: 	top--;
nuclear@23: }
nuclear@23: 
nuclear@23: void imtk_layout_start(int x, int y, int sp, int dir)
nuclear@23: {
nuclear@23: 	st[top].box[0] = st[top].span[0] = x;
nuclear@23: 	st[top].box[1] = st[top].span[1] = y;
nuclear@23: 	st[top].box[2] = st[top].box[3] = st[top].span[2] = st[top].span[3] = 0;
nuclear@23: 	st[top].spacing = sp;
nuclear@23: 	st[top].dir = dir;
nuclear@23: }
nuclear@23: 
nuclear@23: void imtk_layout_dir(int dir)
nuclear@23: {
nuclear@23: 	st[top].dir = dir;
nuclear@23: 	if(dir == IMTK_VERTICAL) {
nuclear@23: 		imtk_layout_newline();
nuclear@23: 	}
nuclear@23: }
nuclear@23: 
nuclear@23: void imtk_layout_advance(int width, int height)
nuclear@23: {
nuclear@23: 	int max_span_y, max_box_y;
nuclear@23: 
nuclear@23: 	st[top].span[2] += width + st[top].spacing;
nuclear@23: 
nuclear@23: 	if(height > st[top].span[3]) {
nuclear@23: 		st[top].span[3] = height;
nuclear@23: 	}
nuclear@23: 
nuclear@23: 	max_span_y = st[top].span[1] + st[top].span[3];
nuclear@23: 	max_box_y = st[top].box[1] + st[top].box[3];
nuclear@23: 
nuclear@23: 	if(max_span_y > max_box_y) {
nuclear@23: 		st[top].box[3] = max_span_y - st[top].box[1];
nuclear@23: 	}
nuclear@23: 	if(st[top].span[2] > st[top].box[2]) {
nuclear@23: 		st[top].box[2] = st[top].span[2];
nuclear@23: 	}
nuclear@23: 
nuclear@23: 	if(st[top].dir == IMTK_VERTICAL) {
nuclear@23: 		imtk_layout_newline();
nuclear@23: 	}
nuclear@23: }
nuclear@23: 
nuclear@23: void imtk_layout_newline(void)
nuclear@23: {
nuclear@23: 	st[top].span[0] = st[top].box[0];
nuclear@23: 	st[top].span[1] = st[top].box[1] + st[top].box[3] + spacing;
nuclear@23: 	st[top].span[2] = st[top].span[3] = 0;
nuclear@23: }
nuclear@23: 
nuclear@23: void imtk_layout_get_pos(int *x, int *y)
nuclear@23: {
nuclear@23: 	*x = st[top].span[0] + st[top].span[2];
nuclear@23: 	*y = st[top].span[1];
nuclear@23: }
nuclear@23: 
nuclear@23: void imtk_layout_get_bounds(int *bbox)
nuclear@23: {
nuclear@23: 	memcpy(bbox, st[top].box, sizeof st[top].box);
nuclear@23: }