mirror of
https://github.com/0TheSpy/Seaside.git
synced 2025-01-11 03:32:10 +08:00
404 lines
9.7 KiB
C
404 lines
9.7 KiB
C
#ifndef STB_INCLUDE_STB_RECT_PACK_H
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#define STB_INCLUDE_STB_RECT_PACK_H
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#define STB_RECT_PACK_VERSION 1
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#ifdef STBRP_STATIC
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#define STBRP_DEF static
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#else
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#define STBRP_DEF extern
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct stbrp_context stbrp_context;
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typedef struct stbrp_node stbrp_node;
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typedef struct stbrp_rect stbrp_rect;
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#ifdef STBRP_LARGE_RECTS
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typedef int stbrp_coord;
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#else
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typedef unsigned short stbrp_coord;
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#endif
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STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
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struct stbrp_rect
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{
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int id;
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stbrp_coord w, h;
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stbrp_coord x, y;
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int was_packed;
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};
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STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
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STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
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STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
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enum
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{
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STBRP_HEURISTIC_Skyline_default=0,
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STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
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STBRP_HEURISTIC_Skyline_BF_sortHeight
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};
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struct stbrp_node
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{
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stbrp_coord x,y;
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stbrp_node *next;
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};
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struct stbrp_context
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{
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int width;
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int height;
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int align;
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int init_mode;
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int heuristic;
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int num_nodes;
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stbrp_node *active_head;
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stbrp_node *free_head;
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stbrp_node extra[2];
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};
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#ifdef __cplusplus
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}
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#endif
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#endif
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#ifdef STB_RECT_PACK_IMPLEMENTATION
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#ifndef STBRP_SORT
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#include <stdlib.h>
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#define STBRP_SORT qsort
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#endif
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#ifndef STBRP_ASSERT
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#include <assert.h>
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#define STBRP_ASSERT assert
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#endif
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#ifdef _MSC_VER
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#define STBRP__NOTUSED(v) (void)(v)
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#define STBRP__CDECL __cdecl
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#else
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#define STBRP__NOTUSED(v) (void)sizeof(v)
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#define STBRP__CDECL
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#endif
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enum
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{
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STBRP__INIT_skyline = 1
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};
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STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
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{
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switch (context->init_mode) {
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case STBRP__INIT_skyline:
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STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
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context->heuristic = heuristic;
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break;
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default:
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STBRP_ASSERT(0);
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}
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}
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STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
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{
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if (allow_out_of_mem)
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context->align = 1;
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else {
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context->align = (context->width + context->num_nodes-1) / context->num_nodes;
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}
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}
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STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
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{
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int i;
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#ifndef STBRP_LARGE_RECTS
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STBRP_ASSERT(width <= 0xffff && height <= 0xffff);
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#endif
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for (i=0; i < num_nodes-1; ++i)
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nodes[i].next = &nodes[i+1];
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nodes[i].next = NULL;
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context->init_mode = STBRP__INIT_skyline;
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context->heuristic = STBRP_HEURISTIC_Skyline_default;
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context->free_head = &nodes[0];
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context->active_head = &context->extra[0];
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context->width = width;
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context->height = height;
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context->num_nodes = num_nodes;
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stbrp_setup_allow_out_of_mem(context, 0);
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context->extra[0].x = 0;
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context->extra[0].y = 0;
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context->extra[0].next = &context->extra[1];
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context->extra[1].x = (stbrp_coord) width;
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#ifdef STBRP_LARGE_RECTS
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context->extra[1].y = (1<<30);
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#else
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context->extra[1].y = 65535;
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#endif
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context->extra[1].next = NULL;
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}
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static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
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{
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stbrp_node *node = first;
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int x1 = x0 + width;
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int min_y, visited_width, waste_area;
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STBRP__NOTUSED(c);
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STBRP_ASSERT(first->x <= x0);
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#if 0
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while (node->next->x <= x0)
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++node;
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#else
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STBRP_ASSERT(node->next->x > x0);
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#endif
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STBRP_ASSERT(node->x <= x0);
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min_y = 0;
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waste_area = 0;
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visited_width = 0;
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while (node->x < x1) {
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if (node->y > min_y) {
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waste_area += visited_width * (node->y - min_y);
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min_y = node->y;
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if (node->x < x0)
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visited_width += node->next->x - x0;
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else
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visited_width += node->next->x - node->x;
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} else {
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int under_width = node->next->x - node->x;
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if (under_width + visited_width > width)
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under_width = width - visited_width;
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waste_area += under_width * (min_y - node->y);
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visited_width += under_width;
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}
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node = node->next;
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}
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*pwaste = waste_area;
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return min_y;
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}
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typedef struct
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{
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int x,y;
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stbrp_node **prev_link;
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} stbrp__findresult;
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static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
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{
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int best_waste = (1<<30), best_x, best_y = (1 << 30);
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stbrp__findresult fr;
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stbrp_node **prev, *node, *tail, **best = NULL;
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width = (width + c->align - 1);
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width -= width % c->align;
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STBRP_ASSERT(width % c->align == 0);
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if (width > c->width || height > c->height) {
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fr.prev_link = NULL;
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fr.x = fr.y = 0;
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return fr;
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}
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node = c->active_head;
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prev = &c->active_head;
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while (node->x + width <= c->width) {
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int y,waste;
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y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
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if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) {
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if (y < best_y) {
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best_y = y;
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best = prev;
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}
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} else {
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if (y + height <= c->height) {
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if (y < best_y || (y == best_y && waste < best_waste)) {
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best_y = y;
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best_waste = waste;
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best = prev;
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}
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}
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}
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prev = &node->next;
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node = node->next;
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}
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best_x = (best == NULL) ? 0 : (*best)->x;
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if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
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tail = c->active_head;
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node = c->active_head;
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prev = &c->active_head;
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while (tail->x < width)
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tail = tail->next;
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while (tail) {
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int xpos = tail->x - width;
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int y,waste;
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STBRP_ASSERT(xpos >= 0);
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while (node->next->x <= xpos) {
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prev = &node->next;
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node = node->next;
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}
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STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
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y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
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if (y + height <= c->height) {
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if (y <= best_y) {
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if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
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best_x = xpos;
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STBRP_ASSERT(y <= best_y);
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best_y = y;
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best_waste = waste;
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best = prev;
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}
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}
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}
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tail = tail->next;
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}
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}
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fr.prev_link = best;
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fr.x = best_x;
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fr.y = best_y;
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return fr;
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}
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static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
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{
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stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
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stbrp_node *node, *cur;
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if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
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res.prev_link = NULL;
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return res;
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}
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node = context->free_head;
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node->x = (stbrp_coord) res.x;
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node->y = (stbrp_coord) (res.y + height);
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context->free_head = node->next;
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cur = *res.prev_link;
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if (cur->x < res.x) {
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stbrp_node *next = cur->next;
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cur->next = node;
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cur = next;
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} else {
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*res.prev_link = node;
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}
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while (cur->next && cur->next->x <= res.x + width) {
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stbrp_node *next = cur->next;
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cur->next = context->free_head;
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context->free_head = cur;
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cur = next;
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}
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node->next = cur;
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if (cur->x < res.x + width)
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cur->x = (stbrp_coord) (res.x + width);
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#ifdef _DEBUG
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cur = context->active_head;
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while (cur->x < context->width) {
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STBRP_ASSERT(cur->x < cur->next->x);
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cur = cur->next;
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}
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STBRP_ASSERT(cur->next == NULL);
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{
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int count=0;
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cur = context->active_head;
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while (cur) {
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cur = cur->next;
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++count;
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}
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cur = context->free_head;
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while (cur) {
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cur = cur->next;
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++count;
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}
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STBRP_ASSERT(count == context->num_nodes+2);
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}
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#endif
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return res;
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}
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static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
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{
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const stbrp_rect *p = (const stbrp_rect *) a;
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const stbrp_rect *q = (const stbrp_rect *) b;
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if (p->h > q->h)
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return -1;
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if (p->h < q->h)
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return 1;
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return (p->w > q->w) ? -1 : (p->w < q->w);
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}
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static int STBRP__CDECL rect_original_order(const void *a, const void *b)
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{
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const stbrp_rect *p = (const stbrp_rect *) a;
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const stbrp_rect *q = (const stbrp_rect *) b;
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return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
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}
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#ifdef STBRP_LARGE_RECTS
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#define STBRP__MAXVAL 0xffffffff
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#else
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#define STBRP__MAXVAL 0xffff
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#endif
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STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
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{
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int i, all_rects_packed = 1;
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for (i=0; i < num_rects; ++i) {
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rects[i].was_packed = i;
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}
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STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
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for (i=0; i < num_rects; ++i) {
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if (rects[i].w == 0 || rects[i].h == 0) {
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rects[i].x = rects[i].y = 0;
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} else {
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stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
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if (fr.prev_link) {
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rects[i].x = (stbrp_coord) fr.x;
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rects[i].y = (stbrp_coord) fr.y;
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} else {
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rects[i].x = rects[i].y = STBRP__MAXVAL;
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}
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}
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}
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STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
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for (i=0; i < num_rects; ++i) {
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rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
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if (!rects[i].was_packed)
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all_rects_packed = 0;
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}
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return all_rects_packed;
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}
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#endif
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