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627 lines
20 KiB
C
627 lines
20 KiB
C
// [DEAR IMGUI]
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// This is a slightly modified version of stb_rect_pack.h 1.01.
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// Grep for [DEAR IMGUI] to find the changes.
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//
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// stb_rect_pack.h - v1.01 - public domain - rectangle packing
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// Sean Barrett 2014
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//
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// Useful for e.g. packing rectangular textures into an atlas.
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// Does not do rotation.
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//
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// Before #including,
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//
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// #define STB_RECT_PACK_IMPLEMENTATION
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//
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// in the file that you want to have the implementation.
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//
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// Not necessarily the awesomest packing method, but better than
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// the totally naive one in stb_truetype (which is primarily what
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// this is meant to replace).
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//
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// Has only had a few tests run, may have issues.
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//
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// More docs to come.
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//
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// No memory allocations; uses qsort() and assert() from stdlib.
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// Can override those by defining STBRP_SORT and STBRP_ASSERT.
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//
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// This library currently uses the Skyline Bottom-Left algorithm.
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//
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// Please note: better rectangle packers are welcome! Please
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// implement them to the same API, but with a different init
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// function.
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//
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// Credits
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//
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// Library
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// Sean Barrett
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// Minor features
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// Martins Mozeiko
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// github:IntellectualKitty
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//
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// Bugfixes / warning fixes
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// Jeremy Jaussaud
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// Fabian Giesen
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//
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// Version history:
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//
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// 1.01 (2021-07-11) always use large rect mode, expose STBRP__MAXVAL in public section
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// 1.00 (2019-02-25) avoid small space waste; gracefully fail too-wide rectangles
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// 0.99 (2019-02-07) warning fixes
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// 0.11 (2017-03-03) return packing success/fail result
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// 0.10 (2016-10-25) remove cast-away-const to avoid warnings
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// 0.09 (2016-08-27) fix compiler warnings
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// 0.08 (2015-09-13) really fix bug with empty rects (w=0 or h=0)
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// 0.07 (2015-09-13) fix bug with empty rects (w=0 or h=0)
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// 0.06 (2015-04-15) added STBRP_SORT to allow replacing qsort
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// 0.05: added STBRP_ASSERT to allow replacing assert
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// 0.04: fixed minor bug in STBRP_LARGE_RECTS support
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// 0.01: initial release
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//
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// LICENSE
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//
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// See end of file for license information.
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//////////////////////////////////////////////////////////////////////////////
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//
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// INCLUDE SECTION
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//
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#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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typedef int stbrp_coord;
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#define STBRP__MAXVAL 0x7fffffff
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// Mostly for internal use, but this is the maximum supported coordinate value.
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STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
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// Assign packed locations to rectangles. The rectangles are of type
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// 'stbrp_rect' defined below, stored in the array 'rects', and there
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// are 'num_rects' many of them.
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//
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// Rectangles which are successfully packed have the 'was_packed' flag
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// set to a non-zero value and 'x' and 'y' store the minimum location
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// on each axis (i.e. bottom-left in cartesian coordinates, top-left
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// if you imagine y increasing downwards). Rectangles which do not fit
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// have the 'was_packed' flag set to 0.
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//
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// You should not try to access the 'rects' array from another thread
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// while this function is running, as the function temporarily reorders
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// the array while it executes.
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//
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// To pack into another rectangle, you need to call stbrp_init_target
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// again. To continue packing into the same rectangle, you can call
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// this function again. Calling this multiple times with multiple rect
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// arrays will probably produce worse packing results than calling it
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// a single time with the full rectangle array, but the option is
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// available.
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//
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// The function returns 1 if all of the rectangles were successfully
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// packed and 0 otherwise.
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struct stbrp_rect
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{
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// reserved for your use:
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int id;
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// input:
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stbrp_coord w, h;
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// output:
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stbrp_coord x, y;
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int was_packed; // non-zero if valid packing
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}; // 16 bytes, nominally
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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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// Initialize a rectangle packer to:
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// pack a rectangle that is 'width' by 'height' in dimensions
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// using temporary storage provided by the array 'nodes', which is 'num_nodes' long
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//
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// You must call this function every time you start packing into a new target.
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//
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// There is no "shutdown" function. The 'nodes' memory must stay valid for
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// the following stbrp_pack_rects() call (or calls), but can be freed after
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// the call (or calls) finish.
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//
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// Note: to guarantee best results, either:
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// 1. make sure 'num_nodes' >= 'width'
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// or 2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
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//
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// If you don't do either of the above things, widths will be quantized to multiples
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// of small integers to guarantee the algorithm doesn't run out of temporary storage.
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//
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// If you do #2, then the non-quantized algorithm will be used, but the algorithm
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// may run out of temporary storage and be unable to pack some rectangles.
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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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// Optionally call this function after init but before doing any packing to
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// change the handling of the out-of-temp-memory scenario, described above.
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// If you call init again, this will be reset to the default (false).
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STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
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// Optionally select which packing heuristic the library should use. Different
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// heuristics will produce better/worse results for different data sets.
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// If you call init again, this will be reset to the default.
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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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//////////////////////////////////////////////////////////////////////////////
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//
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// the details of the following structures don't matter to you, but they must
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// be visible so you can handle the memory allocations for them
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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]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+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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//////////////////////////////////////////////////////////////////////////////
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//
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// IMPLEMENTATION SECTION
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//
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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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// if it's ok to run out of memory, then don't bother aligning them;
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// this gives better packing, but may fail due to OOM (even though
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// the rectangles easily fit). @TODO a smarter approach would be to only
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// quantize once we've hit OOM, then we could get rid of this parameter.
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context->align = 1;
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else {
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// if it's not ok to run out of memory, then quantize the widths
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// so that num_nodes is always enough nodes.
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//
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// I.e. num_nodes * align >= width
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// align >= width / num_nodes
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// align = ceil(width/num_nodes)
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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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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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// node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
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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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context->extra[1].y = (1<<30);
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context->extra[1].next = NULL;
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}
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// find minimum y position if it starts at x1
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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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// skip in case we're past the node
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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); // we ended up handling this in the caller for efficiency
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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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// raise min_y higher.
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// we've accounted for all waste up to min_y,
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// but we'll now add more waste for everything we've visted
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waste_area += visited_width * (node->y - min_y);
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min_y = node->y;
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// the first time through, visited_width might be reduced
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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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// add waste area
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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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// align to multiple of c->align
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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 it can't possibly fit, bail immediately
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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) { // actually just want to test BL
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// bottom left
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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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// best-fit
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if (y + height <= c->height) {
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// can only use it if it first vertically
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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 doing best-fit (BF), we also have to try aligning right edge to each node position
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//
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// e.g, if fitting
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//
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// ____________________
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// |____________________|
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//
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// into
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//
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// | |
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// | ____________|
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// |____________|
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//
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// then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
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//
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// This makes BF take about 2x the time
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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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// find first node that's admissible
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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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// find the left position that matches this
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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); [DEAR IMGUI]
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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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// find best position according to heuristic
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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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// bail if:
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// 1. it failed
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// 2. the best node doesn't fit (we don't always check this)
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// 3. we're out of memory
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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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// on success, create new node
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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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// insert the new node into the right starting point, and
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// let 'cur' point to the remaining nodes needing to be
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// stiched back in
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cur = *res.prev_link;
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if (cur->x < res.x) {
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// preserve the existing one, so start testing with the next one
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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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// from here, traverse cur and free the nodes, until we get to one
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// that shouldn't be freed
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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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// move the current node to the free list
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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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// stitch the list back in
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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);
|
|
cur = cur->next;
|
|
}
|
|
STBRP_ASSERT(cur->next == NULL);
|
|
|
|
{
|
|
int count=0;
|
|
cur = context->active_head;
|
|
while (cur) {
|
|
cur = cur->next;
|
|
++count;
|
|
}
|
|
cur = context->free_head;
|
|
while (cur) {
|
|
cur = cur->next;
|
|
++count;
|
|
}
|
|
STBRP_ASSERT(count == context->num_nodes+2);
|
|
}
|
|
#endif
|
|
|
|
return res;
|
|
}
|
|
|
|
static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
|
|
{
|
|
const stbrp_rect *p = (const stbrp_rect *) a;
|
|
const stbrp_rect *q = (const stbrp_rect *) b;
|
|
if (p->h > q->h)
|
|
return -1;
|
|
if (p->h < q->h)
|
|
return 1;
|
|
return (p->w > q->w) ? -1 : (p->w < q->w);
|
|
}
|
|
|
|
static int STBRP__CDECL rect_original_order(const void *a, const void *b)
|
|
{
|
|
const stbrp_rect *p = (const stbrp_rect *) a;
|
|
const stbrp_rect *q = (const stbrp_rect *) b;
|
|
return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
|
|
}
|
|
|
|
STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
|
|
{
|
|
int i, all_rects_packed = 1;
|
|
|
|
// we use the 'was_packed' field internally to allow sorting/unsorting
|
|
for (i=0; i < num_rects; ++i) {
|
|
rects[i].was_packed = i;
|
|
}
|
|
|
|
// sort according to heuristic
|
|
STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
|
|
|
|
for (i=0; i < num_rects; ++i) {
|
|
if (rects[i].w == 0 || rects[i].h == 0) {
|
|
rects[i].x = rects[i].y = 0; // empty rect needs no space
|
|
} else {
|
|
stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
|
|
if (fr.prev_link) {
|
|
rects[i].x = (stbrp_coord) fr.x;
|
|
rects[i].y = (stbrp_coord) fr.y;
|
|
} else {
|
|
rects[i].x = rects[i].y = STBRP__MAXVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
// unsort
|
|
STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
|
|
|
|
// set was_packed flags and all_rects_packed status
|
|
for (i=0; i < num_rects; ++i) {
|
|
rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
|
|
if (!rects[i].was_packed)
|
|
all_rects_packed = 0;
|
|
}
|
|
|
|
// return the all_rects_packed status
|
|
return all_rects_packed;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
------------------------------------------------------------------------------
|
|
This software is available under 2 licenses -- choose whichever you prefer.
|
|
------------------------------------------------------------------------------
|
|
ALTERNATIVE A - MIT License
|
|
Copyright (c) 2017 Sean Barrett
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
|
so, subject to the following conditions:
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
------------------------------------------------------------------------------
|
|
ALTERNATIVE B - Public Domain (www.unlicense.org)
|
|
This is free and unencumbered software released into the public domain.
|
|
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
|
|
software, either in source code form or as a compiled binary, for any purpose,
|
|
commercial or non-commercial, and by any means.
|
|
In jurisdictions that recognize copyright laws, the author or authors of this
|
|
software dedicate any and all copyright interest in the software to the public
|
|
domain. We make this dedication for the benefit of the public at large and to
|
|
the detriment of our heirs and successors. We intend this dedication to be an
|
|
overt act of relinquishment in perpetuity of all present and future rights to
|
|
this software under copyright law.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
------------------------------------------------------------------------------
|
|
*/
|