146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
#include <limits.h>
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#include <math.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <wayland-server-protocol.h>
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#include <wlr/types/wlr_box.h>
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#include <wlr/util/log.h>
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void wlr_box_closest_point(const struct wlr_box *box, double x, double y,
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double *dest_x, double *dest_y) {
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// find the closest x point
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if (x < box->x) {
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*dest_x = box->x;
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} else if (x > box->x + box->width) {
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*dest_x = box->x + box->width;
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} else {
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*dest_x = x;
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}
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// find closest y point
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if (y < box->y) {
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*dest_y = box->y;
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} else if (y > box->y + box->height) {
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*dest_y = box->y + box->height;
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} else {
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*dest_y = y;
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}
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}
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bool wlr_box_empty(const struct wlr_box *box) {
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return box == NULL || box->width <= 0 || box->height <= 0;
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}
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bool wlr_box_intersection(const struct wlr_box *box_a,
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const struct wlr_box *box_b, struct wlr_box *dest) {
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bool a_empty = wlr_box_empty(box_a);
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bool b_empty = wlr_box_empty(box_b);
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if (a_empty || b_empty) {
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dest->x = 0;
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dest->y = 0;
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dest->width = -100;
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dest->height = -100;
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return false;
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}
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int x1 = fmax(box_a->x, box_b->x);
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int y1 = fmax(box_a->y, box_b->y);
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int x2 = fmin(box_a->x + box_a->width, box_b->x + box_b->width);
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int y2 = fmin(box_a->y + box_a->height, box_b->y + box_b->height);
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dest->x = x1;
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dest->y = y1;
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dest->width = x2 - x1;
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dest->height = y2 - y1;
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return !wlr_box_empty(dest);
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}
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bool wlr_box_contains_point(const struct wlr_box *box, double x, double y) {
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if (wlr_box_empty(box)) {
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return false;
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} else {
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return x >= box->x && x <= box->x + box->width &&
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y >= box->y && y <= box->y + box->height;
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}
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}
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void wlr_box_transform(const struct wlr_box *box,
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enum wl_output_transform transform, int width, int height,
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struct wlr_box *dest) {
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struct wlr_box src = *box;
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if (transform % 2 == 0) {
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dest->width = src.width;
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dest->height = src.height;
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} else {
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dest->width = src.height;
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dest->height = src.width;
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}
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switch (transform) {
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case WL_OUTPUT_TRANSFORM_NORMAL:
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dest->x = src.x;
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dest->y = src.y;
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break;
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case WL_OUTPUT_TRANSFORM_90:
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dest->x = src.y;
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dest->y = width - src.x - src.width;
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break;
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case WL_OUTPUT_TRANSFORM_180:
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dest->x = width - src.x - src.width;
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dest->y = height - src.y - src.height;
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break;
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case WL_OUTPUT_TRANSFORM_270:
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dest->x = height - src.y - src.height;
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dest->y = src.x;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED:
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dest->x = width - src.x - src.width;
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dest->y = src.y;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED_90:
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dest->x = height - src.y - src.height;
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dest->y = width - src.x - src.width;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED_180:
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dest->x = src.x;
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dest->y = height - src.y - src.height;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED_270:
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dest->x = src.y;
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dest->y = src.x;
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break;
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}
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}
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void wlr_box_rotated_bounds(const struct wlr_box *box, float rotation,
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struct wlr_box *dest) {
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if (rotation == 0) {
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*dest = *box;
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return;
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}
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double ox = box->x + (double)box->width/2;
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double oy = box->y + (double)box->height/2;
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double c = fabs(cos(rotation));
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double s = fabs(sin(rotation));
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double x1 = ox + (box->x - ox) * c + (box->y - oy) * s;
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double x2 = ox +
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(box->x + box->width - ox) * c +
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(box->y + box->height - oy) * s;
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double y1 = oy + (box->x - ox) * s + (box->y - oy) * c;
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double y2 = oy +
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(box->x + box->width - ox) * s +
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(box->y + box->height - oy) * c;
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dest->x = floor(fmin(x1, x2));
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dest->width = ceil(fmax(x1, x2) - fmin(x1, x2));
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dest->y = floor(fmin(y1, y2));
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dest->height = ceil(fmax(y1, y2) - fmin(y1, y2));
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}
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