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Thomas Buck 9 anos atrás
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  1. 547
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      src/deps/imgui/stb_rect_pack.h
  2. 2649
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      src/deps/imgui/stb_truetype.h

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src/deps/imgui/stb_rect_pack.h Ver arquivo

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+// stb_rect_pack.h - v0.05 - 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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+// 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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+//
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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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+// Version history:
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+//
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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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+//////////////////////////////////////////////////////////////////////////////
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+//
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+//       INCLUDE SECTION
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+//
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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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+
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+#define STB_RECT_PACK_VERSION  1
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+
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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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+
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+#ifdef __cplusplus
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+extern "C" {
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+#endif
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+
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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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+
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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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+
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+STBRP_DEF void 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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+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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+
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+   // input:
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+   stbrp_coord    w, h;
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+
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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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+
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+}; // 16 bytes, nominally
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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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+// 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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+
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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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+
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+
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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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+
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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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+//////////////////////////////////////////////////////////////////////////////
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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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+
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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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+
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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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+
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+#ifdef __cplusplus
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+}
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+#endif
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+
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+#endif
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+
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+//////////////////////////////////////////////////////////////////////////////
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+//
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+//     IMPLEMENTATION SECTION
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+//
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+
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+#ifdef STB_RECT_PACK_IMPLEMENTATION
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+#include <stdlib.h>
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+#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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+
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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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+   (void)c;
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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_ASSERT(first->x <= x0);
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+
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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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+
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+   STBRP_ASSERT(node->x <= x0);
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+
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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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+
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+   *pwaste = waste_area;
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+   return min_y;
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+}
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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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+
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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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+
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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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+
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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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+
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+   best_x = (best == NULL) ? 0 : (*best)->x;
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+
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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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+
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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);
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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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+      }         
390
+   }
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+
392
+   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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+
398
+static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
399
+{
400
+   // find best position according to heuristic
401
+   stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
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+   stbrp_node *node, *cur;
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+
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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)
407
+   //    3. we're out of memory
408
+   if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
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+      res.prev_link = NULL;
410
+      return res;
411
+   }
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+
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+   // on success, create new node
414
+   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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+
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+   context->free_head = node->next;
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+
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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
422
+   // stiched back in
423
+
424
+   cur = *res.prev_link;
425
+   if (cur->x < res.x) {
426
+      // preserve the existing one, so start testing with the next one
427
+      stbrp_node *next = cur->next;
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+      cur->next = node;
429
+      cur = next;
430
+   } else {
431
+      *res.prev_link = node;
432
+   }
433
+
434
+   // from here, traverse cur and free the nodes, until we get to one
435
+   // that shouldn't be freed
436
+   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
439
+      cur->next = context->free_head;
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+      context->free_head = cur;
441
+      cur = next;
442
+   }
443
+
444
+   // stitch the list back in
445
+   node->next = cur;
446
+
447
+   if (cur->x < res.x + width)
448
+      cur->x = (stbrp_coord) (res.x + width);
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+
450
+#ifdef _DEBUG
451
+   cur = context->active_head;
452
+   while (cur->x < context->width) {
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+      STBRP_ASSERT(cur->x < cur->next->x);
454
+      cur = cur->next;
455
+   }
456
+   STBRP_ASSERT(cur->next == NULL);
457
+
458
+   {
459
+      stbrp_node *L1 = NULL, *L2 = NULL;
460
+      int count=0;
461
+      cur = context->active_head;
462
+      while (cur) {
463
+         L1 = cur;
464
+         cur = cur->next;
465
+         ++count;
466
+      }
467
+      cur = context->free_head;
468
+      while (cur) {
469
+         L2 = cur;
470
+         cur = cur->next;
471
+         ++count;
472
+      }
473
+      STBRP_ASSERT(count == context->num_nodes+2);
474
+   }
475
+#endif
476
+
477
+   return res;
478
+}
479
+
480
+static int rect_height_compare(const void *a, const void *b)
481
+{
482
+   stbrp_rect *p = (stbrp_rect *) a;
483
+   stbrp_rect *q = (stbrp_rect *) b;
484
+   if (p->h > q->h)
485
+      return -1;
486
+   if (p->h < q->h)
487
+      return  1;
488
+   return (p->w > q->w) ? -1 : (p->w < q->w);
489
+}
490
+
491
+static int rect_width_compare(const void *a, const void *b)
492
+{
493
+   stbrp_rect *p = (stbrp_rect *) a;
494
+   stbrp_rect *q = (stbrp_rect *) b;
495
+   if (p->w > q->w)
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+      return -1;
497
+   if (p->w < q->w)
498
+      return  1;
499
+   return (p->h > q->h) ? -1 : (p->h < q->h);
500
+}
501
+
502
+static int rect_original_order(const void *a, const void *b)
503
+{
504
+   stbrp_rect *p = (stbrp_rect *) a;
505
+   stbrp_rect *q = (stbrp_rect *) b;
506
+   return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
507
+}
508
+
509
+#ifdef STBRP_LARGE_RECTS
510
+#define STBRP__MAXVAL  0xffffffff
511
+#else
512
+#define STBRP__MAXVAL  0xffff
513
+#endif
514
+
515
+STBRP_DEF void stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
516
+{
517
+   int i;
518
+
519
+   // we use the 'was_packed' field internally to allow sorting/unsorting
520
+   for (i=0; i < num_rects; ++i) {
521
+      rects[i].was_packed = i;
522
+      #ifndef STBRP_LARGE_RECTS
523
+      STBRP_ASSERT(rects[i].w <= 0xffff && rects[i].h <= 0xffff);
524
+      #endif
525
+   }
526
+
527
+   // sort according to heuristic
528
+   qsort(rects, num_rects, sizeof(rects[0]), rect_height_compare);
529
+
530
+   for (i=0; i < num_rects; ++i) {
531
+      stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
532
+      if (fr.prev_link) {
533
+         rects[i].x = (stbrp_coord) fr.x;
534
+         rects[i].y = (stbrp_coord) fr.y;
535
+      } else {
536
+         rects[i].x = rects[i].y = STBRP__MAXVAL;
537
+      }
538
+   }
539
+
540
+   // unsort
541
+   qsort(rects, num_rects, sizeof(rects[0]), rect_original_order);
542
+
543
+   // set was_packed flags
544
+   for (i=0; i < num_rects; ++i)
545
+      rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
546
+}
547
+#endif

+ 2649
- 0
src/deps/imgui/stb_truetype.h
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