diff options
| -rw-r--r-- | helpers.h | 2 | ||||
| -rw-r--r-- | helpers_array.c | 96 | ||||
| -rw-r--r-- | helpers_array.h | 22 |
3 files changed, 119 insertions, 1 deletions
@@ -8,6 +8,7 @@ #define HELPERS_H #include "drv.h" +#include "helpers_array.h" uint32_t drv_stride_from_format(uint32_t format, uint32_t width, size_t plane); uint32_t drv_size_from_format(uint32_t format, uint32_t stride, uint32_t height, size_t plane); @@ -35,5 +36,4 @@ struct kms_item *drv_query_kms(struct driver *drv, uint32_t *num_items); int drv_modify_linear_combinations(struct driver *drv); uint64_t drv_pick_modifier(const uint64_t *modifiers, uint32_t count, const uint64_t *modifier_order, uint32_t order_count); - #endif diff --git a/helpers_array.c b/helpers_array.c new file mode 100644 index 0000000..20b43e2 --- /dev/null +++ b/helpers_array.c @@ -0,0 +1,96 @@ +/* + * Copyright 2017 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include <assert.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> + +#include "util.h" + +struct drv_array { + void **items; + uint32_t size; + uint32_t item_size; + uint32_t allocations; +}; + +struct drv_array *drv_array_init(uint32_t item_size) +{ + struct drv_array *array; + + array = calloc(1, sizeof(*array)); + + /* Start with a power of 2 number of allocations. */ + array->allocations = 2; + array->items = calloc(array->allocations, sizeof(*array->items)); + array->item_size = item_size; + return array; +} + +void *drv_array_append(struct drv_array *array, void *data) +{ + void *item; + + if (array->size >= array->allocations) { + void **new_items = NULL; + array->allocations *= 2; + new_items = realloc(array->items, array->allocations * sizeof(*array->items)); + assert(new_items); + array->items = new_items; + } + + item = calloc(1, array->item_size); + memcpy(item, data, array->item_size); + array->items[array->size] = item; + array->size++; + return item; +} + +void drv_array_remove(struct drv_array *array, uint32_t idx) +{ + uint32_t i; + + assert(array); + assert(idx < array->size); + + free(array->items[idx]); + array->items[idx] = NULL; + + for (i = idx + 1; i < array->size; i++) + array->items[i - 1] = array->items[i]; + + array->size--; + if ((DIV_ROUND_UP(array->allocations, 2) > array->size) && array->allocations > 2) { + void **new_items = NULL; + array->allocations = DIV_ROUND_UP(array->allocations, 2); + new_items = realloc(array->items, array->allocations * sizeof(*array->items)); + assert(new_items); + array->items = new_items; + } +} + +void *drv_array_at_idx(struct drv_array *array, uint32_t idx) +{ + assert(idx < array->size); + return array->items[idx]; +} + +uint32_t drv_array_size(struct drv_array *array) +{ + return array->size; +} + +void drv_array_destroy(struct drv_array *array) +{ + uint32_t i; + + for (i = 0; i < array->size; i++) + free(array->items[i]); + + free(array->items); + free(array); +} diff --git a/helpers_array.h b/helpers_array.h new file mode 100644 index 0000000..2893976 --- /dev/null +++ b/helpers_array.h @@ -0,0 +1,22 @@ +/* + * Copyright 2017 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +struct drv_array; + +struct drv_array *drv_array_init(uint32_t item_size); + +/* The data will be copied and appended to the array. */ +void *drv_array_append(struct drv_array *array, void *data); + +/* The data at the specified index will be freed -- the array will shrink. */ +void drv_array_remove(struct drv_array *array, uint32_t idx); + +void *drv_array_at_idx(struct drv_array *array, uint32_t idx); + +uint32_t drv_array_size(struct drv_array *array); + +/* The array and all associated data will be freed. */ +void drv_array_destroy(struct drv_array *array); |