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https://gitlab.freedesktop.org/wlroots/wlroots.git
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06a13203dd
In addition to `button_count`, we keep track of the current buttons pressed just as in `wlr_keyboard`. Add `set_add` and `set_remove` to assist with this. These functions can only be used with values greater than 0 (such as the button/key masks for keyboards and pointers). Partially addresses: - https://github.com/swaywm/wlroots/issues/1716 - https://github.com/swaywm/wlroots/issues/1593
50 lines
1011 B
C
50 lines
1011 B
C
#include "util/array.h"
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#include <assert.h>
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// https://www.geeksforgeeks.org/move-zeroes-end-array/
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size_t push_zeroes_to_end(uint32_t arr[], size_t n) {
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size_t count = 0;
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for (size_t i = 0; i < n; i++) {
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if (arr[i] != 0) {
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arr[count++] = arr[i];
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}
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}
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size_t ret = count;
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while (count < n) {
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arr[count++] = 0;
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}
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return ret;
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}
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bool set_add(uint32_t values[], size_t *len, size_t cap, uint32_t target) {
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if (*len == cap) {
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return false;
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}
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assert(target > 0);
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for (uint32_t i = 0; i < *len; ++i) {
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if (values[i] == target) {
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return false;
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}
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}
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values[(*len)++] = target;
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return false;
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}
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bool set_remove(uint32_t values[], size_t *len, size_t cap, uint32_t target) {
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for (uint32_t i = 0; i < *len; ++i) {
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if (values[i] == target) {
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// Set to 0 and swap with the end element so that
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// zeroes exist only after all the values.
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size_t last_elem_pos = --(*len);
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values[i] = values[last_elem_pos];
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values[last_elem_pos] = 0;
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return true;
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}
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}
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return false;
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}
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