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b53a5c |
// stb_rect_pack.h - v1.01 - public domain - rectangle packing
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b53a5c |
// Sean Barrett 2014
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b53a5c |
//
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b53a5c |
// Useful for e.g. packing rectangular textures into an atlas.
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b53a5c |
// Does not do rotation.
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b53a5c |
//
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b53a5c |
// Before #including,
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b53a5c |
//
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b53a5c |
// #define STB_RECT_PACK_IMPLEMENTATION
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b53a5c |
//
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b53a5c |
// in the file that you want to have the implementation.
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b53a5c |
//
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b53a5c |
// Not necessarily the awesomest packing method, but better than
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b53a5c |
// the totally naive one in stb_truetype (which is primarily what
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b53a5c |
// this is meant to replace).
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b53a5c |
//
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b53a5c |
// Has only had a few tests run, may have issues.
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b53a5c |
//
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b53a5c |
// More docs to come.
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b53a5c |
//
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b53a5c |
// No memory allocations; uses qsort() and assert() from stdlib.
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b53a5c |
// Can override those by defining STBRP_SORT and STBRP_ASSERT.
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b53a5c |
//
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b53a5c |
// This library currently uses the Skyline Bottom-Left algorithm.
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b53a5c |
//
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b53a5c |
// Please note: better rectangle packers are welcome! Please
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b53a5c |
// implement them to the same API, but with a different init
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b53a5c |
// function.
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b53a5c |
//
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b53a5c |
// Credits
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b53a5c |
//
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b53a5c |
// Library
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b53a5c |
// Sean Barrett
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b53a5c |
// Minor features
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b53a5c |
// Martins Mozeiko
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b53a5c |
// github:IntellectualKitty
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b53a5c |
//
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b53a5c |
// Bugfixes / warning fixes
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b53a5c |
// Jeremy Jaussaud
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b53a5c |
// Fabian Giesen
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b53a5c |
//
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b53a5c |
// Version history:
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b53a5c |
//
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b53a5c |
// 1.01 (2021-07-11) always use large rect mode, expose STBRP__MAXVAL in public section
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b53a5c |
// 1.00 (2019-02-25) avoid small space waste; gracefully fail too-wide rectangles
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b53a5c |
// 0.99 (2019-02-07) warning fixes
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b53a5c |
// 0.11 (2017-03-03) return packing success/fail result
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b53a5c |
// 0.10 (2016-10-25) remove cast-away-const to avoid warnings
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b53a5c |
// 0.09 (2016-08-27) fix compiler warnings
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b53a5c |
// 0.08 (2015-09-13) really fix bug with empty rects (w=0 or h=0)
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b53a5c |
// 0.07 (2015-09-13) fix bug with empty rects (w=0 or h=0)
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b53a5c |
// 0.06 (2015-04-15) added STBRP_SORT to allow replacing qsort
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b53a5c |
// 0.05: added STBRP_ASSERT to allow replacing assert
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b53a5c |
// 0.04: fixed minor bug in STBRP_LARGE_RECTS support
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b53a5c |
// 0.01: initial release
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b53a5c |
//
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b53a5c |
// LICENSE
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b53a5c |
//
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b53a5c |
// See end of file for license information.
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b53a5c |
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b53a5c |
//////////////////////////////////////////////////////////////////////////////
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b53a5c |
//
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b53a5c |
// INCLUDE SECTION
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b53a5c |
//
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b53a5c |
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b53a5c |
#ifndef STB_INCLUDE_STB_RECT_PACK_H
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b53a5c |
#define STB_INCLUDE_STB_RECT_PACK_H
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b53a5c |
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b53a5c |
#define STB_RECT_PACK_VERSION 1
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b53a5c |
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b53a5c |
#ifdef STBRP_STATIC
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b53a5c |
#define STBRP_DEF static
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b53a5c |
#else
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b53a5c |
#define STBRP_DEF extern
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b53a5c |
#endif
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b53a5c |
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b53a5c |
#ifdef __cplusplus
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b53a5c |
extern "C" {
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b53a5c |
#endif
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b53a5c |
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b53a5c |
typedef struct stbrp_context stbrp_context;
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b53a5c |
typedef struct stbrp_node stbrp_node;
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b53a5c |
typedef struct stbrp_rect stbrp_rect;
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b53a5c |
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b53a5c |
typedef int stbrp_coord;
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b53a5c |
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b53a5c |
#define STBRP__MAXVAL 0x7fffffff
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b53a5c |
// Mostly for internal use, but this is the maximum supported coordinate value.
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b53a5c |
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b53a5c |
STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
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b53a5c |
// Assign packed locations to rectangles. The rectangles are of type
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b53a5c |
// 'stbrp_rect' defined below, stored in the array 'rects', and there
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b53a5c |
// are 'num_rects' many of them.
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b53a5c |
//
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b53a5c |
// Rectangles which are successfully packed have the 'was_packed' flag
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b53a5c |
// set to a non-zero value and 'x' and 'y' store the minimum location
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b53a5c |
// on each axis (i.e. bottom-left in cartesian coordinates, top-left
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b53a5c |
// if you imagine y increasing downwards). Rectangles which do not fit
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b53a5c |
// have the 'was_packed' flag set to 0.
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b53a5c |
//
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b53a5c |
// You should not try to access the 'rects' array from another thread
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b53a5c |
// while this function is running, as the function temporarily reorders
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b53a5c |
// the array while it executes.
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b53a5c |
//
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b53a5c |
// To pack into another rectangle, you need to call stbrp_init_target
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b53a5c |
// again. To continue packing into the same rectangle, you can call
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b53a5c |
// this function again. Calling this multiple times with multiple rect
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b53a5c |
// arrays will probably produce worse packing results than calling it
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b53a5c |
// a single time with the full rectangle array, but the option is
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b53a5c |
// available.
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b53a5c |
//
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b53a5c |
// The function returns 1 if all of the rectangles were successfully
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b53a5c |
// packed and 0 otherwise.
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b53a5c |
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b53a5c |
struct stbrp_rect
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b53a5c |
{
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b53a5c |
// reserved for your use:
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b53a5c |
int id;
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b53a5c |
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b53a5c |
// input:
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b53a5c |
stbrp_coord w, h;
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b53a5c |
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b53a5c |
// output:
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b53a5c |
stbrp_coord x, y;
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b53a5c |
int was_packed; // non-zero if valid packing
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b53a5c |
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b53a5c |
}; // 16 bytes, nominally
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b53a5c |
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b53a5c |
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b53a5c |
STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
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b53a5c |
// Initialize a rectangle packer to:
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b53a5c |
// pack a rectangle that is 'width' by 'height' in dimensions
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b53a5c |
// using temporary storage provided by the array 'nodes', which is 'num_nodes' long
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b53a5c |
//
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b53a5c |
// You must call this function every time you start packing into a new target.
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b53a5c |
//
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b53a5c |
// There is no "shutdown" function. The 'nodes' memory must stay valid for
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b53a5c |
// the following stbrp_pack_rects() call (or calls), but can be freed after
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b53a5c |
// the call (or calls) finish.
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b53a5c |
//
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b53a5c |
// Note: to guarantee best results, either:
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b53a5c |
// 1. make sure 'num_nodes' >= 'width'
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b53a5c |
// or 2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
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b53a5c |
//
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b53a5c |
// If you don't do either of the above things, widths will be quantized to multiples
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b53a5c |
// of small integers to guarantee the algorithm doesn't run out of temporary storage.
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b53a5c |
//
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b53a5c |
// If you do #2, then the non-quantized algorithm will be used, but the algorithm
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b53a5c |
// may run out of temporary storage and be unable to pack some rectangles.
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b53a5c |
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b53a5c |
STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
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b53a5c |
// Optionally call this function after init but before doing any packing to
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b53a5c |
// change the handling of the out-of-temp-memory scenario, described above.
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b53a5c |
// If you call init again, this will be reset to the default (false).
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b53a5c |
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b53a5c |
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b53a5c |
STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
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b53a5c |
// Optionally select which packing heuristic the library should use. Different
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b53a5c |
// heuristics will produce better/worse results for different data sets.
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b53a5c |
// If you call init again, this will be reset to the default.
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b53a5c |
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b53a5c |
enum
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b53a5c |
{
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b53a5c |
STBRP_HEURISTIC_Skyline_default=0,
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b53a5c |
STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
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b53a5c |
STBRP_HEURISTIC_Skyline_BF_sortHeight
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b53a5c |
};
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b53a5c |
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b53a5c |
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b53a5c |
//////////////////////////////////////////////////////////////////////////////
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b53a5c |
//
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b53a5c |
// the details of the following structures don't matter to you, but they must
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b53a5c |
// be visible so you can handle the memory allocations for them
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b53a5c |
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b53a5c |
struct stbrp_node
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b53a5c |
{
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b53a5c |
stbrp_coord x,y;
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b53a5c |
stbrp_node *next;
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b53a5c |
};
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b53a5c |
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b53a5c |
struct stbrp_context
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b53a5c |
{
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b53a5c |
int width;
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b53a5c |
int height;
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b53a5c |
int align;
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b53a5c |
int init_mode;
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b53a5c |
int heuristic;
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b53a5c |
int num_nodes;
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b53a5c |
stbrp_node *active_head;
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b53a5c |
stbrp_node *free_head;
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b53a5c |
stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
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b53a5c |
};
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b53a5c |
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b53a5c |
#ifdef __cplusplus
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b53a5c |
}
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b53a5c |
#endif
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b53a5c |
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b53a5c |
#endif
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b53a5c |
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b53a5c |
//////////////////////////////////////////////////////////////////////////////
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b53a5c |
//
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b53a5c |
// IMPLEMENTATION SECTION
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b53a5c |
//
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b53a5c |
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b53a5c |
#ifdef STB_RECT_PACK_IMPLEMENTATION
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b53a5c |
#ifndef STBRP_SORT
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b53a5c |
#include <stdlib.h></stdlib.h>
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b53a5c |
#define STBRP_SORT qsort
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b53a5c |
#endif
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b53a5c |
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b53a5c |
#ifndef STBRP_ASSERT
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b53a5c |
#include <assert.h></assert.h>
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b53a5c |
#define STBRP_ASSERT assert
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b53a5c |
#endif
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b53a5c |
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b53a5c |
#ifdef _MSC_VER
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b53a5c |
#define STBRP__NOTUSED(v) (void)(v)
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b53a5c |
#define STBRP__CDECL __cdecl
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b53a5c |
#else
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b53a5c |
#define STBRP__NOTUSED(v) (void)sizeof(v)
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b53a5c |
#define STBRP__CDECL
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b53a5c |
#endif
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b53a5c |
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b53a5c |
enum
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b53a5c |
{
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b53a5c |
STBRP__INIT_skyline = 1
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b53a5c |
};
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b53a5c |
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b53a5c |
STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
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b53a5c |
{
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b53a5c |
switch (context->init_mode) {
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b53a5c |
case STBRP__INIT_skyline:
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b53a5c |
STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
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b53a5c |
context->heuristic = heuristic;
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b53a5c |
break;
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b53a5c |
default:
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b53a5c |
STBRP_ASSERT(0);
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b53a5c |
}
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b53a5c |
}
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b53a5c |
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b53a5c |
STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
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b53a5c |
{
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b53a5c |
if (allow_out_of_mem)
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b53a5c |
// if it's ok to run out of memory, then don't bother aligning them;
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b53a5c |
// this gives better packing, but may fail due to OOM (even though
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b53a5c |
// the rectangles easily fit). @TODO a smarter approach would be to only
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b53a5c |
// quantize once we've hit OOM, then we could get rid of this parameter.
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b53a5c |
context->align = 1;
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b53a5c |
else {
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b53a5c |
// if it's not ok to run out of memory, then quantize the widths
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b53a5c |
// so that num_nodes is always enough nodes.
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b53a5c |
//
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b53a5c |
// I.e. num_nodes * align >= width
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b53a5c |
// align >= width / num_nodes
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b53a5c |
// align = ceil(width/num_nodes)
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b53a5c |
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b53a5c |
context->align = (context->width + context->num_nodes-1) / context->num_nodes;
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b53a5c |
}
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b53a5c |
}
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b53a5c |
|
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b53a5c |
STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
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b53a5c |
{
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b53a5c |
int i;
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b53a5c |
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b53a5c |
for (i=0; i < num_nodes-1; ++i)
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b53a5c |
nodes[i].next = &nodes[i+1];
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b53a5c |
nodes[i].next = NULL;
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b53a5c |
context->init_mode = STBRP__INIT_skyline;
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b53a5c |
context->heuristic = STBRP_HEURISTIC_Skyline_default;
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b53a5c |
context->free_head = &nodes[0];
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b53a5c |
context->active_head = &context->extra[0];
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b53a5c |
context->width = width;
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b53a5c |
context->height = height;
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b53a5c |
context->num_nodes = num_nodes;
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b53a5c |
stbrp_setup_allow_out_of_mem(context, 0);
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b53a5c |
|
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b53a5c |
// node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
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b53a5c |
context->extra[0].x = 0;
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b53a5c |
context->extra[0].y = 0;
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|
b53a5c |
context->extra[0].next = &context->extra[1];
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|
b53a5c |
context->extra[1].x = (stbrp_coord) width;
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|
b53a5c |
context->extra[1].y = (1<<30);
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b53a5c |
context->extra[1].next = NULL;
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b53a5c |
}
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b53a5c |
|
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|
b53a5c |
// find minimum y position if it starts at x1
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|
b53a5c |
static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
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b53a5c |
{
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|
b53a5c |
stbrp_node *node = first;
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|
b53a5c |
int x1 = x0 + width;
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b53a5c |
int min_y, visited_width, waste_area;
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b53a5c |
|
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|
b53a5c |
STBRP__NOTUSED(c);
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b53a5c |
|
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b53a5c |
STBRP_ASSERT(first->x <= x0);
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b53a5c |
|
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b53a5c |
#if 0
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|
b53a5c |
// skip in case we're past the node
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|
b53a5c |
while (node->next->x <= x0)
|
|
|
b53a5c |
++node;
|
|
|
b53a5c |
#else
|
|
|
b53a5c |
STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
|
|
|
b53a5c |
#endif
|
|
|
b53a5c |
|
|
|
b53a5c |
STBRP_ASSERT(node->x <= x0);
|
|
|
b53a5c |
|
|
|
b53a5c |
min_y = 0;
|
|
|
b53a5c |
waste_area = 0;
|
|
|
b53a5c |
visited_width = 0;
|
|
|
b53a5c |
while (node->x < x1) {
|
|
|
b53a5c |
if (node->y > min_y) {
|
|
|
b53a5c |
// raise min_y higher.
|
|
|
b53a5c |
// we've accounted for all waste up to min_y,
|
|
|
b53a5c |
// but we'll now add more waste for everything we've visted
|
|
|
b53a5c |
waste_area += visited_width * (node->y - min_y);
|
|
|
b53a5c |
min_y = node->y;
|
|
|
b53a5c |
// the first time through, visited_width might be reduced
|
|
|
b53a5c |
if (node->x < x0)
|
|
|
b53a5c |
visited_width += node->next->x - x0;
|
|
|
b53a5c |
else
|
|
|
b53a5c |
visited_width += node->next->x - node->x;
|
|
|
b53a5c |
} else {
|
|
|
b53a5c |
// add waste area
|
|
|
b53a5c |
int under_width = node->next->x - node->x;
|
|
|
b53a5c |
if (under_width + visited_width > width)
|
|
|
b53a5c |
under_width = width - visited_width;
|
|
|
b53a5c |
waste_area += under_width * (min_y - node->y);
|
|
|
b53a5c |
visited_width += under_width;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
node = node->next;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
*pwaste = waste_area;
|
|
|
b53a5c |
return min_y;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
typedef struct
|
|
|
b53a5c |
{
|
|
|
b53a5c |
int x,y;
|
|
|
b53a5c |
stbrp_node **prev_link;
|
|
|
b53a5c |
} stbrp__findresult;
|
|
|
b53a5c |
|
|
|
b53a5c |
static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
|
|
|
b53a5c |
{
|
|
|
b53a5c |
int best_waste = (1<<30), best_x, best_y = (1 << 30);
|
|
|
b53a5c |
stbrp__findresult fr;
|
|
|
b53a5c |
stbrp_node **prev, *node, *tail, **best = NULL;
|
|
|
b53a5c |
|
|
|
b53a5c |
// align to multiple of c->align
|
|
|
b53a5c |
width = (width + c->align - 1);
|
|
|
b53a5c |
width -= width % c->align;
|
|
|
b53a5c |
STBRP_ASSERT(width % c->align == 0);
|
|
|
b53a5c |
|
|
|
b53a5c |
// if it can't possibly fit, bail immediately
|
|
|
b53a5c |
if (width > c->width || height > c->height) {
|
|
|
b53a5c |
fr.prev_link = NULL;
|
|
|
b53a5c |
fr.x = fr.y = 0;
|
|
|
b53a5c |
return fr;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
node = c->active_head;
|
|
|
b53a5c |
prev = &c->active_head;
|
|
|
b53a5c |
while (node->x + width <= c->width) {
|
|
|
b53a5c |
int y,waste;
|
|
|
b53a5c |
y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
|
|
|
b53a5c |
if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
|
|
|
b53a5c |
// bottom left
|
|
|
b53a5c |
if (y < best_y) {
|
|
|
b53a5c |
best_y = y;
|
|
|
b53a5c |
best = prev;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
} else {
|
|
|
b53a5c |
// best-fit
|
|
|
b53a5c |
if (y + height <= c->height) {
|
|
|
b53a5c |
// can only use it if it first vertically
|
|
|
b53a5c |
if (y < best_y || (y == best_y && waste < best_waste)) {
|
|
|
b53a5c |
best_y = y;
|
|
|
b53a5c |
best_waste = waste;
|
|
|
b53a5c |
best = prev;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
prev = &node->next;
|
|
|
b53a5c |
node = node->next;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
best_x = (best == NULL) ? 0 : (*best)->x;
|
|
|
b53a5c |
|
|
|
b53a5c |
// if doing best-fit (BF), we also have to try aligning right edge to each node position
|
|
|
b53a5c |
//
|
|
|
b53a5c |
// e.g, if fitting
|
|
|
b53a5c |
//
|
|
|
b53a5c |
// ____________________
|
|
|
b53a5c |
// |____________________|
|
|
|
b53a5c |
//
|
|
|
b53a5c |
// into
|
|
|
b53a5c |
//
|
|
|
b53a5c |
// | |
|
|
|
b53a5c |
// | ____________|
|
|
|
b53a5c |
// |____________|
|
|
|
b53a5c |
//
|
|
|
b53a5c |
// then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
|
|
|
b53a5c |
//
|
|
|
b53a5c |
// This makes BF take about 2x the time
|
|
|
b53a5c |
|
|
|
b53a5c |
if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
|
|
|
b53a5c |
tail = c->active_head;
|
|
|
b53a5c |
node = c->active_head;
|
|
|
b53a5c |
prev = &c->active_head;
|
|
|
b53a5c |
// find first node that's admissible
|
|
|
b53a5c |
while (tail->x < width)
|
|
|
b53a5c |
tail = tail->next;
|
|
|
b53a5c |
while (tail) {
|
|
|
b53a5c |
int xpos = tail->x - width;
|
|
|
b53a5c |
int y,waste;
|
|
|
b53a5c |
STBRP_ASSERT(xpos >= 0);
|
|
|
b53a5c |
// find the left position that matches this
|
|
|
b53a5c |
while (node->next->x <= xpos) {
|
|
|
b53a5c |
prev = &node->next;
|
|
|
b53a5c |
node = node->next;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
|
|
|
b53a5c |
y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
|
|
|
b53a5c |
if (y + height <= c->height) {
|
|
|
b53a5c |
if (y <= best_y) {
|
|
|
b53a5c |
if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
|
|
|
b53a5c |
best_x = xpos;
|
|
|
b53a5c |
STBRP_ASSERT(y <= best_y);
|
|
|
b53a5c |
best_y = y;
|
|
|
b53a5c |
best_waste = waste;
|
|
|
b53a5c |
best = prev;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
tail = tail->next;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
fr.prev_link = best;
|
|
|
b53a5c |
fr.x = best_x;
|
|
|
b53a5c |
fr.y = best_y;
|
|
|
b53a5c |
return fr;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
|
|
|
b53a5c |
{
|
|
|
b53a5c |
// find best position according to heuristic
|
|
|
b53a5c |
stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
|
|
|
b53a5c |
stbrp_node *node, *cur;
|
|
|
b53a5c |
|
|
|
b53a5c |
// bail if:
|
|
|
b53a5c |
// 1. it failed
|
|
|
b53a5c |
// 2. the best node doesn't fit (we don't always check this)
|
|
|
b53a5c |
// 3. we're out of memory
|
|
|
b53a5c |
if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
|
|
|
b53a5c |
res.prev_link = NULL;
|
|
|
b53a5c |
return res;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
// on success, create new node
|
|
|
b53a5c |
node = context->free_head;
|
|
|
b53a5c |
node->x = (stbrp_coord) res.x;
|
|
|
b53a5c |
node->y = (stbrp_coord) (res.y + height);
|
|
|
b53a5c |
|
|
|
b53a5c |
context->free_head = node->next;
|
|
|
b53a5c |
|
|
|
b53a5c |
// insert the new node into the right starting point, and
|
|
|
b53a5c |
// let 'cur' point to the remaining nodes needing to be
|
|
|
b53a5c |
// stiched back in
|
|
|
b53a5c |
|
|
|
b53a5c |
cur = *res.prev_link;
|
|
|
b53a5c |
if (cur->x < res.x) {
|
|
|
b53a5c |
// preserve the existing one, so start testing with the next one
|
|
|
b53a5c |
stbrp_node *next = cur->next;
|
|
|
b53a5c |
cur->next = node;
|
|
|
b53a5c |
cur = next;
|
|
|
b53a5c |
} else {
|
|
|
b53a5c |
*res.prev_link = node;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
// from here, traverse cur and free the nodes, until we get to one
|
|
|
b53a5c |
// that shouldn't be freed
|
|
|
b53a5c |
while (cur->next && cur->next->x <= res.x + width) {
|
|
|
b53a5c |
stbrp_node *next = cur->next;
|
|
|
b53a5c |
// move the current node to the free list
|
|
|
b53a5c |
cur->next = context->free_head;
|
|
|
b53a5c |
context->free_head = cur;
|
|
|
b53a5c |
cur = next;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
// stitch the list back in
|
|
|
b53a5c |
node->next = cur;
|
|
|
b53a5c |
|
|
|
b53a5c |
if (cur->x < res.x + width)
|
|
|
b53a5c |
cur->x = (stbrp_coord) (res.x + width);
|
|
|
b53a5c |
|
|
|
b53a5c |
#ifdef _DEBUG
|
|
|
b53a5c |
cur = context->active_head;
|
|
|
b53a5c |
while (cur->x < context->width) {
|
|
|
b53a5c |
STBRP_ASSERT(cur->x < cur->next->x);
|
|
|
b53a5c |
cur = cur->next;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
STBRP_ASSERT(cur->next == NULL);
|
|
|
b53a5c |
|
|
|
b53a5c |
{
|
|
|
b53a5c |
int count=0;
|
|
|
b53a5c |
cur = context->active_head;
|
|
|
b53a5c |
while (cur) {
|
|
|
b53a5c |
cur = cur->next;
|
|
|
b53a5c |
++count;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
cur = context->free_head;
|
|
|
b53a5c |
while (cur) {
|
|
|
b53a5c |
cur = cur->next;
|
|
|
b53a5c |
++count;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
STBRP_ASSERT(count == context->num_nodes+2);
|
|
|
b53a5c |
}
|
|
|
b53a5c |
#endif
|
|
|
b53a5c |
|
|
|
b53a5c |
return res;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
|
|
|
b53a5c |
{
|
|
|
b53a5c |
const stbrp_rect *p = (const stbrp_rect *) a;
|
|
|
b53a5c |
const stbrp_rect *q = (const stbrp_rect *) b;
|
|
|
b53a5c |
if (p->h > q->h)
|
|
|
b53a5c |
return -1;
|
|
|
b53a5c |
if (p->h < q->h)
|
|
|
b53a5c |
return 1;
|
|
|
b53a5c |
return (p->w > q->w) ? -1 : (p->w < q->w);
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
static int STBRP__CDECL rect_original_order(const void *a, const void *b)
|
|
|
b53a5c |
{
|
|
|
b53a5c |
const stbrp_rect *p = (const stbrp_rect *) a;
|
|
|
b53a5c |
const stbrp_rect *q = (const stbrp_rect *) b;
|
|
|
b53a5c |
return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
|
|
|
b53a5c |
{
|
|
|
b53a5c |
int i, all_rects_packed = 1;
|
|
|
b53a5c |
|
|
|
b53a5c |
// we use the 'was_packed' field internally to allow sorting/unsorting
|
|
|
b53a5c |
for (i=0; i < num_rects; ++i) {
|
|
|
b53a5c |
rects[i].was_packed = i;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
// sort according to heuristic
|
|
|
b53a5c |
STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
|
|
|
b53a5c |
|
|
|
b53a5c |
for (i=0; i < num_rects; ++i) {
|
|
|
b53a5c |
if (rects[i].w == 0 || rects[i].h == 0) {
|
|
|
b53a5c |
rects[i].x = rects[i].y = 0; // empty rect needs no space
|
|
|
b53a5c |
} else {
|
|
|
b53a5c |
stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
|
|
|
b53a5c |
if (fr.prev_link) {
|
|
|
b53a5c |
rects[i].x = (stbrp_coord) fr.x;
|
|
|
b53a5c |
rects[i].y = (stbrp_coord) fr.y;
|
|
|
b53a5c |
} else {
|
|
|
b53a5c |
rects[i].x = rects[i].y = STBRP__MAXVAL;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
// unsort
|
|
|
b53a5c |
STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
|
|
|
b53a5c |
|
|
|
b53a5c |
// set was_packed flags and all_rects_packed status
|
|
|
b53a5c |
for (i=0; i < num_rects; ++i) {
|
|
|
b53a5c |
rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
|
|
|
b53a5c |
if (!rects[i].was_packed)
|
|
|
b53a5c |
all_rects_packed = 0;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
|
|
|
b53a5c |
// return the all_rects_packed status
|
|
|
b53a5c |
return all_rects_packed;
|
|
|
b53a5c |
}
|
|
|
b53a5c |
#endif
|
|
|
b53a5c |
|
|
|
b53a5c |
/*
|
|
|
b53a5c |
------------------------------------------------------------------------------
|
|
|
b53a5c |
This software is available under 2 licenses -- choose whichever you prefer.
|
|
|
b53a5c |
------------------------------------------------------------------------------
|
|
|
b53a5c |
ALTERNATIVE A - MIT License
|
|
|
b53a5c |
Copyright (c) 2017 Sean Barrett
|
|
|
b53a5c |
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
|
b53a5c |
this software and associated documentation files (the "Software"), to deal in
|
|
|
b53a5c |
the Software without restriction, including without limitation the rights to
|
|
|
b53a5c |
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
|
b53a5c |
of the Software, and to permit persons to whom the Software is furnished to do
|
|
|
b53a5c |
so, subject to the following conditions:
|
|
|
b53a5c |
The above copyright notice and this permission notice shall be included in all
|
|
|
b53a5c |
copies or substantial portions of the Software.
|
|
|
b53a5c |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
b53a5c |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
b53a5c |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
|
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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ALTERNATIVE B - Public Domain (www.unlicense.org)
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
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software, either in source code form or as a compiled binary, for any purpose,
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commercial or non-commercial, and by any means.
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In jurisdictions that recognize copyright laws, the author or authors of this
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software dedicate any and all copyright interest in the software to the public
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domain. We make this dedication for the benefit of the public at large and to
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the detriment of our heirs and successors. We intend this dedication to be an
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overt act of relinquishment in perpetuity of all present and future rights to
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this software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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------------------------------------------------------------------------------
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*/
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