63 lines
2 KiB
C
63 lines
2 KiB
C
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#include "nuklear.h"
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#include "nuklear_internal.h"
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/* ===============================================================
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*
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* PAGE ELEMENT
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*
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* ===============================================================*/
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NK_LIB struct nk_page_element*
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nk_create_page_element(struct nk_context *ctx)
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{
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struct nk_page_element *elem;
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if (ctx->freelist) {
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/* unlink page element from free list */
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elem = ctx->freelist;
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ctx->freelist = elem->next;
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} else if (ctx->use_pool) {
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/* allocate page element from memory pool */
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elem = nk_pool_alloc(&ctx->pool);
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NK_ASSERT(elem);
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if (!elem) return 0;
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} else {
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/* allocate new page element from back of fixed size memory buffer */
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NK_STORAGE const nk_size size = sizeof(struct nk_page_element);
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NK_STORAGE const nk_size align = NK_ALIGNOF(struct nk_page_element);
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elem = (struct nk_page_element*)nk_buffer_alloc(&ctx->memory, NK_BUFFER_BACK, size, align);
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NK_ASSERT(elem);
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if (!elem) return 0;
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}
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nk_zero_struct(*elem);
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elem->next = 0;
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elem->prev = 0;
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return elem;
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}
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NK_LIB void
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nk_link_page_element_into_freelist(struct nk_context *ctx,
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struct nk_page_element *elem)
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{
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/* link table into freelist */
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if (!ctx->freelist) {
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ctx->freelist = elem;
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} else {
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elem->next = ctx->freelist;
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ctx->freelist = elem;
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}
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}
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NK_LIB void
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nk_free_page_element(struct nk_context *ctx, struct nk_page_element *elem)
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{
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/* we have a pool so just add to free list */
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if (ctx->use_pool) {
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nk_link_page_element_into_freelist(ctx, elem);
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return;
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}
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/* if possible remove last element from back of fixed memory buffer */
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{void *elem_end = (void*)(elem + 1);
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void *buffer_end = (nk_byte*)ctx->memory.memory.ptr + ctx->memory.size;
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if (elem_end == buffer_end)
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ctx->memory.size -= sizeof(struct nk_page_element);
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else nk_link_page_element_into_freelist(ctx, elem);}
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}
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