/**
* Test which verifies that guac_common_rect_extend() expands the given
* rectangle as necessary to contain at least the given bounds.
*/
void test_rect__extend() {
guac_common_rect max;
guac_common_rect rect;
guac_common_rect_init(&rect, 10, 10, 90, 90);
guac_common_rect_init(&max, 0, 0, 100, 100);
guac_common_rect_extend(&rect, &max);
CU_ASSERT_EQUAL(0, rect.x);
CU_ASSERT_EQUAL(0, rect.y);
CU_ASSERT_EQUAL(100, rect.width);
CU_ASSERT_EQUAL(100, rect.height);
}
void guac_common_rect_constrain(guac_common_rect* rect, const guac_common_rect* max) {
/* Calculate extents of existing dirty rect */
int left = rect->x;
int top = rect->y;
int right = left + rect->width;
int bottom = top + rect->height;
/* Calculate missing extents of given new rect */
int max_left = max->x;
int max_top = max->y;
int max_right = max_left + max->width;
int max_bottom = max_top + max->height;
/* Update maximums */
if (max_left > left) left = max_left;
if (max_top > top) top = max_top;
if (max_right < right) right = max_right;
if (max_bottom < bottom) bottom = max_bottom;
/* Commit rect */
guac_common_rect_init(rect, left, top, right - left, bottom - top);
}
void guac_common_rect_extend(guac_common_rect* rect, const guac_common_rect* min) {
/* Calculate extents of existing dirty rect */
int left = rect->x;
int top = rect->y;
int right = left + rect->width;
int bottom = top + rect->height;
/* Calculate missing extents of given new rect */
int min_left = min->x;
int min_top = min->y;
int min_right = min_left + min->width;
int min_bottom = min_top + min->height;
/* Update minimums */
if (min_left < left) left = min_left;
if (min_top < top) top = min_top;
if (min_right > right) right = min_right;
if (min_bottom > bottom) bottom = min_bottom;
/* Commit rect */
guac_common_rect_init(rect, left, top, right - left, bottom - top);
}
int guac_common_rect_expand_to_grid(int cell_size, guac_common_rect* rect,
const guac_common_rect* max_rect) {
/* Invalid cell_size received */
if (cell_size <= 0)
return -1;
/* Nothing to do */
if (cell_size == 1)
return 0;
/* Calculate how much the rectangle must be adjusted to fit within the
* given cell size. */
int dw = cell_size - rect->width % cell_size;
int dh = cell_size - rect->height % cell_size;
int dx = dw / 2;
int dy = dh / 2;
/* Set initial extents of adjusted rectangle. */
int top = rect->y - dy;
int left = rect->x - dx;
int bottom = top + rect->height + dh;
int right = left + rect->width + dw;
/* The max rectangle */
int max_left = max_rect->x;
int max_top = max_rect->y;
int max_right = max_left + max_rect->width;
int max_bottom = max_top + max_rect->height;
/* If the adjusted rectangle has sides beyond the max rectangle, or is larger
* in any direction; shift or adjust the rectangle while trying to fit in
* the grid */
/* Adjust left/right */
if (right > max_right) {
/* shift to left */
dw = right - max_right;
right -= dw;
left -= dw;
/* clamp left if too far */
if (left < max_left) {
left = max_left;
}
}
else if (left < max_left) {
/* shift to right */
dw = max_left - left;
left += dw;
right += dw;
/* clamp right if too far */
if (right > max_right) {
right = max_right;
}
}
/* Adjust top/bottom */
if (bottom > max_bottom) {
/* shift up */
dh = bottom - max_bottom;
bottom -= dh;
top -= dh;
/* clamp top if too far */
if (top < max_top) {
top = max_top;
}
}
else if (top < max_top) {
/* shift down */
dh = max_top - top;
top += dh;
bottom += dh;
/* clamp bottom if too far */
if (bottom > max_bottom) {
bottom = max_bottom;
}
}
/* Commit rect */
guac_common_rect_init(rect, left, top, right - left, bottom - top);
return 0;
}
int guac_common_rect_clip_and_split(guac_common_rect* rect,
const guac_common_rect* hole, guac_common_rect* split_rect) {
/* Only continue if the rectangles intersects */
if (!guac_common_rect_intersects(rect, hole))
return 0;
int top, left, bottom, right;
/* Clip and split top */
if (rect->y < hole->y) {
top = rect->y;
left = rect->x;
bottom = hole->y;
right = rect->x + rect->width;
guac_common_rect_init(split_rect, left, top, right - left, bottom - top);
/* Re-initialize original rect */
top = hole->y;
bottom = rect->y + rect->height;
guac_common_rect_init(rect, left, top, right - left, bottom - top);
return 1;
}
/* Clip and split left */
else if (rect->x < hole->x) {
top = rect->y;
left = rect->x;
bottom = rect->y + rect->height;
right = hole->x;
guac_common_rect_init(split_rect, left, top, right - left, bottom - top);
/* Re-initialize original rect */
left = hole->x;
right = rect->x + rect->width;
guac_common_rect_init(rect, left, top, right - left, bottom - top);
return 1;
}
/* Clip and split bottom */
else if (rect->y + rect->height > hole->y + hole->height) {
top = hole->y + hole->height;
left = rect->x;
bottom = rect->y + rect->height;
right = rect->x + rect->width;
guac_common_rect_init(split_rect, left, top, right - left, bottom - top);
/* Re-initialize original rect */
top = rect->y;
bottom = hole->y + hole->height;
guac_common_rect_init(rect, left, top, right - left, bottom - top);
return 1;
}
/* Clip and split right */
else if (rect->x + rect->width > hole->x + hole->width) {
top = rect->y;
left = hole->x + hole->width;
bottom = rect->y + rect->height;
right = rect->x + rect->width;
guac_common_rect_init(split_rect, left, top, right - left, bottom - top);
/* Re-initialize original rect */
left = rect->x;
right = hole->x + hole->width;
guac_common_rect_init(rect, left, top, right - left, bottom - top);
return 1;
}
return 0;
}
void test_guac_rect() {
guac_common_rect max;
/*
* Test init method
*/
guac_common_rect_init(&max, 0, 0, 100, 100);
CU_ASSERT_EQUAL(0, max.x);
CU_ASSERT_EQUAL(0, max.y);
CU_ASSERT_EQUAL(100, max.width);
CU_ASSERT_EQUAL(100, max.height);
/*
* Test constrain method
*/
guac_common_rect rect;
guac_common_rect_init(&rect, -10, -10, 110, 110);
guac_common_rect_init(&max, 0, 0, 100, 100);
guac_common_rect_constrain(&rect, &max);
CU_ASSERT_EQUAL(0, rect.x);
CU_ASSERT_EQUAL(0, rect.y);
CU_ASSERT_EQUAL(100, rect.width);
CU_ASSERT_EQUAL(100, rect.height);
/*
* Test extend method
*/
guac_common_rect_init(&rect, 10, 10, 90, 90);
guac_common_rect_init(&max, 0, 0, 100, 100);
guac_common_rect_extend(&rect, &max);
CU_ASSERT_EQUAL(0, rect.x);
CU_ASSERT_EQUAL(0, rect.y);
CU_ASSERT_EQUAL(100, rect.width);
CU_ASSERT_EQUAL(100, rect.height);
/*
* Test adjust method
*/
int cell_size = 16;
/* Simple adjustment */
guac_common_rect_init(&rect, 0, 0, 25, 25);
guac_common_rect_init(&max, 0, 0, 100, 100);
guac_common_rect_expand_to_grid(cell_size, &rect, &max);
CU_ASSERT_EQUAL(0, rect.x);
CU_ASSERT_EQUAL(0, rect.y);
CU_ASSERT_EQUAL(32, rect.width);
CU_ASSERT_EQUAL(32, rect.height);
/* Adjustment with moving of rect */
guac_common_rect_init(&rect, 75, 75, 25, 25);
guac_common_rect_init(&max, 0, 0, 100, 100);
guac_common_rect_expand_to_grid(cell_size, &rect, &max);
CU_ASSERT_EQUAL(max.width - 32, rect.x);
CU_ASSERT_EQUAL(max.height - 32, rect.y);
CU_ASSERT_EQUAL(32, rect.width);
CU_ASSERT_EQUAL(32, rect.height);
guac_common_rect_init(&rect, -5, -5, 25, 25);
guac_common_rect_init(&max, 0, 0, 100, 100);
guac_common_rect_expand_to_grid(cell_size, &rect, &max);
CU_ASSERT_EQUAL(0, rect.x);
CU_ASSERT_EQUAL(0, rect.y);
CU_ASSERT_EQUAL(32, rect.width);
CU_ASSERT_EQUAL(32, rect.height);
/* Adjustment with moving and clamping of rect */
guac_common_rect_init(&rect, 0, 0, 25, 15);
guac_common_rect_init(&max, 0, 5, 32, 15);
guac_common_rect_expand_to_grid(cell_size, &rect, &max);
CU_ASSERT_EQUAL(max.x, rect.x);
CU_ASSERT_EQUAL(max.y, rect.y);
CU_ASSERT_EQUAL(max.width, rect.width);
CU_ASSERT_EQUAL(max.height, rect.height);
/*
* Rectangle intersection tests
*/
guac_common_rect min;
guac_common_rect_init(&min, 10, 10, 10, 10);
/* Rectangle intersection - empty
* rectangle is outside */
guac_common_rect_init(&rect, 25, 25, 5, 5);
int res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(0, res);
/* Rectangle intersection - complete
* rectangle is completely inside */
guac_common_rect_init(&rect, 11, 11, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(2, res);
/* Rectangle intersection - partial
* rectangle intersects UL */
guac_common_rect_init(&rect, 8, 8, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(1, res);
/* Rectangle intersection - partial
* rectangle intersects LR */
guac_common_rect_init(&rect, 18, 18, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(1, res);
/* Rectangle intersection - complete
* rect intersects along UL but inside */
guac_common_rect_init(&rect, 10, 10, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(2, res);
/* Rectangle intersection - partial
* rectangle intersects along L but outside */
guac_common_rect_init(&rect, 5, 10, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(1, res);
/* Rectangle intersection - complete
* rectangle intersects along LR but rest is inside */
guac_common_rect_init(&rect, 15, 15, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(2, res);
/* Rectangle intersection - partial
* rectangle intersects along R but rest is outside */
guac_common_rect_init(&rect, 20, 10, 5, 5);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(1, res);
/* Rectangle intersection - partial
* rectangle encloses min; which is a partial intersection */
guac_common_rect_init(&rect, 5, 5, 20, 20);
res = guac_common_rect_intersects(&rect, &min);
CU_ASSERT_EQUAL(1, res);
/*
* Basic test of clip and split method
*/
guac_common_rect_init(&min, 10, 10, 10, 10);
guac_common_rect cut;
/* Clip top */
guac_common_rect_init(&rect, 10, 5, 10, 10);
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(10, cut.x);
CU_ASSERT_EQUAL(5, cut.y);
CU_ASSERT_EQUAL(10, cut.width);
CU_ASSERT_EQUAL(5, cut.height);
CU_ASSERT_EQUAL(10, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(10, rect.width);
CU_ASSERT_EQUAL(5, rect.height);
/* Clip bottom */
guac_common_rect_init(&rect, 10, 15, 10, 10);
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(10, cut.x);
CU_ASSERT_EQUAL(20, cut.y);
CU_ASSERT_EQUAL(10, cut.width);
CU_ASSERT_EQUAL(5, cut.height);
CU_ASSERT_EQUAL(10, rect.x);
CU_ASSERT_EQUAL(15, rect.y);
CU_ASSERT_EQUAL(10, rect.width);
CU_ASSERT_EQUAL(5, rect.height);
/* Clip left */
guac_common_rect_init(&rect, 5, 10, 10, 10);
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(5, cut.x);
CU_ASSERT_EQUAL(10, cut.y);
CU_ASSERT_EQUAL(5, cut.width);
CU_ASSERT_EQUAL(10, cut.height);
CU_ASSERT_EQUAL(10, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(5, rect.width);
CU_ASSERT_EQUAL(10, rect.height);
/* Clip right */
guac_common_rect_init(&rect, 15, 10, 10, 10);
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(20, cut.x);
CU_ASSERT_EQUAL(10, cut.y);
CU_ASSERT_EQUAL(5, cut.width);
CU_ASSERT_EQUAL(10, cut.height);
CU_ASSERT_EQUAL(15, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(5, rect.width);
CU_ASSERT_EQUAL(10, rect.height);
/*
* Test a rectangle which completely covers the hole.
* Clip and split until done.
*/
guac_common_rect_init(&rect, 5, 5, 20, 20);
/* Clip top */
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(5, cut.x);
CU_ASSERT_EQUAL(5, cut.y);
CU_ASSERT_EQUAL(20, cut.width);
CU_ASSERT_EQUAL(5, cut.height);
CU_ASSERT_EQUAL(5, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(20, rect.width);
CU_ASSERT_EQUAL(15, rect.height);
/* Clip left */
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(5, cut.x);
CU_ASSERT_EQUAL(10, cut.y);
CU_ASSERT_EQUAL(5, cut.width);
CU_ASSERT_EQUAL(15, cut.height);
CU_ASSERT_EQUAL(10, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(15, rect.width);
CU_ASSERT_EQUAL(15, rect.height);
/* Clip bottom */
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(1, res);
CU_ASSERT_EQUAL(10, cut.x);
CU_ASSERT_EQUAL(20, cut.y);
CU_ASSERT_EQUAL(15, cut.width);
CU_ASSERT_EQUAL(5, cut.height);
CU_ASSERT_EQUAL(10, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(15, rect.width);
CU_ASSERT_EQUAL(10, rect.height);
/* Clip right */
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(20, cut.x);
CU_ASSERT_EQUAL(10, cut.y);
CU_ASSERT_EQUAL(5, cut.width);
CU_ASSERT_EQUAL(10, cut.height);
CU_ASSERT_EQUAL(10, rect.x);
CU_ASSERT_EQUAL(10, rect.y);
CU_ASSERT_EQUAL(10, rect.width);
CU_ASSERT_EQUAL(10, rect.height);
/* Make sure nothing is left to do */
res = guac_common_rect_clip_and_split(&rect, &min, &cut);
CU_ASSERT_EQUAL(0, res);
}
