parent
7fb9d225a0
commit
4e95aeffc3
Binary file not shown.
@ -0,0 +1,623 @@ |
|||||||
|
// stb_rect_pack.h - v1.01 - public domain - rectangle packing
|
||||||
|
// Sean Barrett 2014
|
||||||
|
//
|
||||||
|
// Useful for e.g. packing rectangular textures into an atlas.
|
||||||
|
// Does not do rotation.
|
||||||
|
//
|
||||||
|
// Before #including,
|
||||||
|
//
|
||||||
|
// #define STB_RECT_PACK_IMPLEMENTATION
|
||||||
|
//
|
||||||
|
// in the file that you want to have the implementation.
|
||||||
|
//
|
||||||
|
// Not necessarily the awesomest packing method, but better than
|
||||||
|
// the totally naive one in stb_truetype (which is primarily what
|
||||||
|
// this is meant to replace).
|
||||||
|
//
|
||||||
|
// Has only had a few tests run, may have issues.
|
||||||
|
//
|
||||||
|
// More docs to come.
|
||||||
|
//
|
||||||
|
// No memory allocations; uses qsort() and assert() from stdlib.
|
||||||
|
// Can override those by defining STBRP_SORT and STBRP_ASSERT.
|
||||||
|
//
|
||||||
|
// This library currently uses the Skyline Bottom-Left algorithm.
|
||||||
|
//
|
||||||
|
// Please note: better rectangle packers are welcome! Please
|
||||||
|
// implement them to the same API, but with a different init
|
||||||
|
// function.
|
||||||
|
//
|
||||||
|
// Credits
|
||||||
|
//
|
||||||
|
// Library
|
||||||
|
// Sean Barrett
|
||||||
|
// Minor features
|
||||||
|
// Martins Mozeiko
|
||||||
|
// github:IntellectualKitty
|
||||||
|
//
|
||||||
|
// Bugfixes / warning fixes
|
||||||
|
// Jeremy Jaussaud
|
||||||
|
// Fabian Giesen
|
||||||
|
//
|
||||||
|
// Version history:
|
||||||
|
//
|
||||||
|
// 1.01 (2021-07-11) always use large rect mode, expose STBRP__MAXVAL in public section
|
||||||
|
// 1.00 (2019-02-25) avoid small space waste; gracefully fail too-wide rectangles
|
||||||
|
// 0.99 (2019-02-07) warning fixes
|
||||||
|
// 0.11 (2017-03-03) return packing success/fail result
|
||||||
|
// 0.10 (2016-10-25) remove cast-away-const to avoid warnings
|
||||||
|
// 0.09 (2016-08-27) fix compiler warnings
|
||||||
|
// 0.08 (2015-09-13) really fix bug with empty rects (w=0 or h=0)
|
||||||
|
// 0.07 (2015-09-13) fix bug with empty rects (w=0 or h=0)
|
||||||
|
// 0.06 (2015-04-15) added STBRP_SORT to allow replacing qsort
|
||||||
|
// 0.05: added STBRP_ASSERT to allow replacing assert
|
||||||
|
// 0.04: fixed minor bug in STBRP_LARGE_RECTS support
|
||||||
|
// 0.01: initial release
|
||||||
|
//
|
||||||
|
// LICENSE
|
||||||
|
//
|
||||||
|
// See end of file for license information.
|
||||||
|
|
||||||
|
//////////////////////////////////////////////////////////////////////////////
|
||||||
|
//
|
||||||
|
// INCLUDE SECTION
|
||||||
|
//
|
||||||
|
|
||||||
|
#ifndef STB_INCLUDE_STB_RECT_PACK_H |
||||||
|
#define STB_INCLUDE_STB_RECT_PACK_H |
||||||
|
|
||||||
|
#define STB_RECT_PACK_VERSION 1 |
||||||
|
|
||||||
|
#ifdef STBRP_STATIC |
||||||
|
#define STBRP_DEF static |
||||||
|
#else |
||||||
|
#define STBRP_DEF extern |
||||||
|
#endif |
||||||
|
|
||||||
|
#ifdef __cplusplus |
||||||
|
extern "C" { |
||||||
|
#endif |
||||||
|
|
||||||
|
typedef struct stbrp_context stbrp_context; |
||||||
|
typedef struct stbrp_node stbrp_node; |
||||||
|
typedef struct stbrp_rect stbrp_rect; |
||||||
|
|
||||||
|
typedef int stbrp_coord; |
||||||
|
|
||||||
|
#define STBRP__MAXVAL 0x7fffffff |
||||||
|
// Mostly for internal use, but this is the maximum supported coordinate value.
|
||||||
|
|
||||||
|
STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects); |
||||||
|
// Assign packed locations to rectangles. The rectangles are of type
|
||||||
|
// 'stbrp_rect' defined below, stored in the array 'rects', and there
|
||||||
|
// are 'num_rects' many of them.
|
||||||
|
//
|
||||||
|
// Rectangles which are successfully packed have the 'was_packed' flag
|
||||||
|
// set to a non-zero value and 'x' and 'y' store the minimum location
|
||||||
|
// on each axis (i.e. bottom-left in cartesian coordinates, top-left
|
||||||
|
// if you imagine y increasing downwards). Rectangles which do not fit
|
||||||
|
// have the 'was_packed' flag set to 0.
|
||||||
|
//
|
||||||
|
// You should not try to access the 'rects' array from another thread
|
||||||
|
// while this function is running, as the function temporarily reorders
|
||||||
|
// the array while it executes.
|
||||||
|
//
|
||||||
|
// To pack into another rectangle, you need to call stbrp_init_target
|
||||||
|
// again. To continue packing into the same rectangle, you can call
|
||||||
|
// this function again. Calling this multiple times with multiple rect
|
||||||
|
// arrays will probably produce worse packing results than calling it
|
||||||
|
// a single time with the full rectangle array, but the option is
|
||||||
|
// available.
|
||||||
|
//
|
||||||
|
// The function returns 1 if all of the rectangles were successfully
|
||||||
|
// packed and 0 otherwise.
|
||||||
|
|
||||||
|
struct stbrp_rect |
||||||
|
{ |
||||||
|
// reserved for your use:
|
||||||
|
int id; |
||||||
|
|
||||||
|
// input:
|
||||||
|
stbrp_coord w, h; |
||||||
|
|
||||||
|
// output:
|
||||||
|
stbrp_coord x, y; |
||||||
|
int was_packed; // non-zero if valid packing
|
||||||
|
|
||||||
|
}; // 16 bytes, nominally
|
||||||
|
|
||||||
|
|
||||||
|
STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes); |
||||||
|
// Initialize a rectangle packer to:
|
||||||
|
// pack a rectangle that is 'width' by 'height' in dimensions
|
||||||
|
// using temporary storage provided by the array 'nodes', which is 'num_nodes' long
|
||||||
|
//
|
||||||
|
// You must call this function every time you start packing into a new target.
|
||||||
|
//
|
||||||
|
// There is no "shutdown" function. The 'nodes' memory must stay valid for
|
||||||
|
// the following stbrp_pack_rects() call (or calls), but can be freed after
|
||||||
|
// the call (or calls) finish.
|
||||||
|
//
|
||||||
|
// Note: to guarantee best results, either:
|
||||||
|
// 1. make sure 'num_nodes' >= 'width'
|
||||||
|
// or 2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
|
||||||
|
//
|
||||||
|
// If you don't do either of the above things, widths will be quantized to multiples
|
||||||
|
// of small integers to guarantee the algorithm doesn't run out of temporary storage.
|
||||||
|
//
|
||||||
|
// If you do #2, then the non-quantized algorithm will be used, but the algorithm
|
||||||
|
// may run out of temporary storage and be unable to pack some rectangles.
|
||||||
|
|
||||||
|
STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem); |
||||||
|
// Optionally call this function after init but before doing any packing to
|
||||||
|
// change the handling of the out-of-temp-memory scenario, described above.
|
||||||
|
// If you call init again, this will be reset to the default (false).
|
||||||
|
|
||||||
|
|
||||||
|
STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic); |
||||||
|
// Optionally select which packing heuristic the library should use. Different
|
||||||
|
// heuristics will produce better/worse results for different data sets.
|
||||||
|
// If you call init again, this will be reset to the default.
|
||||||
|
|
||||||
|
enum |
||||||
|
{ |
||||||
|
STBRP_HEURISTIC_Skyline_default=0, |
||||||
|
STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default, |
||||||
|
STBRP_HEURISTIC_Skyline_BF_sortHeight |
||||||
|
}; |
||||||
|
|
||||||
|
|
||||||
|
//////////////////////////////////////////////////////////////////////////////
|
||||||
|
//
|
||||||
|
// the details of the following structures don't matter to you, but they must
|
||||||
|
// be visible so you can handle the memory allocations for them
|
||||||
|
|
||||||
|
struct stbrp_node |
||||||
|
{ |
||||||
|
stbrp_coord x,y; |
||||||
|
stbrp_node *next; |
||||||
|
}; |
||||||
|
|
||||||
|
struct stbrp_context |
||||||
|
{ |
||||||
|
int width; |
||||||
|
int height; |
||||||
|
int align; |
||||||
|
int init_mode; |
||||||
|
int heuristic; |
||||||
|
int num_nodes; |
||||||
|
stbrp_node *active_head; |
||||||
|
stbrp_node *free_head; |
||||||
|
stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
|
||||||
|
}; |
||||||
|
|
||||||
|
#ifdef __cplusplus |
||||||
|
} |
||||||
|
#endif |
||||||
|
|
||||||
|
#endif |
||||||
|
|
||||||
|
//////////////////////////////////////////////////////////////////////////////
|
||||||
|
//
|
||||||
|
// IMPLEMENTATION SECTION
|
||||||
|
//
|
||||||
|
|
||||||
|
#ifdef STB_RECT_PACK_IMPLEMENTATION |
||||||
|
#ifndef STBRP_SORT |
||||||
|
#include <stdlib.h> |
||||||
|
#define STBRP_SORT qsort |
||||||
|
#endif |
||||||
|
|
||||||
|
#ifndef STBRP_ASSERT |
||||||
|
#include <assert.h> |
||||||
|
#define STBRP_ASSERT assert |
||||||
|
#endif |
||||||
|
|
||||||
|
#ifdef _MSC_VER |
||||||
|
#define STBRP__NOTUSED(v) (void)(v) |
||||||
|
#define STBRP__CDECL __cdecl |
||||||
|
#else |
||||||
|
#define STBRP__NOTUSED(v) (void)sizeof(v) |
||||||
|
#define STBRP__CDECL |
||||||
|
#endif |
||||||
|
|
||||||
|
enum |
||||||
|
{ |
||||||
|
STBRP__INIT_skyline = 1 |
||||||
|
}; |
||||||
|
|
||||||
|
STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic) |
||||||
|
{ |
||||||
|
switch (context->init_mode) { |
||||||
|
case STBRP__INIT_skyline: |
||||||
|
STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight); |
||||||
|
context->heuristic = heuristic; |
||||||
|
break; |
||||||
|
default: |
||||||
|
STBRP_ASSERT(0); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem) |
||||||
|
{ |
||||||
|
if (allow_out_of_mem) |
||||||
|
// if it's ok to run out of memory, then don't bother aligning them;
|
||||||
|
// this gives better packing, but may fail due to OOM (even though
|
||||||
|
// the rectangles easily fit). @TODO a smarter approach would be to only
|
||||||
|
// quantize once we've hit OOM, then we could get rid of this parameter.
|
||||||
|
context->align = 1; |
||||||
|
else { |
||||||
|
// if it's not ok to run out of memory, then quantize the widths
|
||||||
|
// so that num_nodes is always enough nodes.
|
||||||
|
//
|
||||||
|
// I.e. num_nodes * align >= width
|
||||||
|
// align >= width / num_nodes
|
||||||
|
// align = ceil(width/num_nodes)
|
||||||
|
|
||||||
|
context->align = (context->width + context->num_nodes-1) / context->num_nodes; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes) |
||||||
|
{ |
||||||
|
int i; |
||||||
|
|
||||||
|
for (i=0; i < num_nodes-1; ++i) |
||||||
|
nodes[i].next = &nodes[i+1]; |
||||||
|
nodes[i].next = NULL; |
||||||
|
context->init_mode = STBRP__INIT_skyline; |
||||||
|
context->heuristic = STBRP_HEURISTIC_Skyline_default; |
||||||
|
context->free_head = &nodes[0]; |
||||||
|
context->active_head = &context->extra[0]; |
||||||
|
context->width = width; |
||||||
|
context->height = height; |
||||||
|
context->num_nodes = num_nodes; |
||||||
|
stbrp_setup_allow_out_of_mem(context, 0); |
||||||
|
|
||||||
|
// node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
|
||||||
|
context->extra[0].x = 0; |
||||||
|
context->extra[0].y = 0; |
||||||
|
context->extra[0].next = &context->extra[1]; |
||||||
|
context->extra[1].x = (stbrp_coord) width; |
||||||
|
context->extra[1].y = (1<<30); |
||||||
|
context->extra[1].next = NULL; |
||||||
|
} |
||||||
|
|
||||||
|
// find minimum y position if it starts at x1
|
||||||
|
static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste) |
||||||
|
{ |
||||||
|
stbrp_node *node = first; |
||||||
|
int x1 = x0 + width; |
||||||
|
int min_y, visited_width, waste_area; |
||||||
|
|
||||||
|
STBRP__NOTUSED(c); |
||||||
|
|
||||||
|
STBRP_ASSERT(first->x <= x0); |
||||||
|
|
||||||
|
#if 0 |
||||||
|
// skip in case we're past the node
|
||||||
|
while (node->next->x <= x0) |
||||||
|
++node; |
||||||
|
#else |
||||||
|
STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
|
||||||
|
#endif |
||||||
|
|
||||||
|
STBRP_ASSERT(node->x <= x0); |
||||||
|
|
||||||
|
min_y = 0; |
||||||
|
waste_area = 0; |
||||||
|
visited_width = 0; |
||||||
|
while (node->x < x1) { |
||||||
|
if (node->y > min_y) { |
||||||
|
// raise min_y higher.
|
||||||
|
// we've accounted for all waste up to min_y,
|
||||||
|
// but we'll now add more waste for everything we've visted
|
||||||
|
waste_area += visited_width * (node->y - min_y); |
||||||
|
min_y = node->y; |
||||||
|
// the first time through, visited_width might be reduced
|
||||||
|
if (node->x < x0) |
||||||
|
visited_width += node->next->x - x0; |
||||||
|
else |
||||||
|
visited_width += node->next->x - node->x; |
||||||
|
} else { |
||||||
|
// add waste area
|
||||||
|
int under_width = node->next->x - node->x; |
||||||
|
if (under_width + visited_width > width) |
||||||
|
under_width = width - visited_width; |
||||||
|
waste_area += under_width * (min_y - node->y); |
||||||
|
visited_width += under_width; |
||||||
|
} |
||||||
|
node = node->next; |
||||||
|
} |
||||||
|
|
||||||
|
*pwaste = waste_area; |
||||||
|
return min_y; |
||||||
|
} |
||||||
|
|
||||||
|
typedef struct |
||||||
|
{ |
||||||
|
int x,y; |
||||||
|
stbrp_node **prev_link; |
||||||
|
} stbrp__findresult; |
||||||
|
|
||||||
|
static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height) |
||||||
|
{ |
||||||
|
int best_waste = (1<<30), best_x, best_y = (1 << 30); |
||||||
|
stbrp__findresult fr; |
||||||
|
stbrp_node **prev, *node, *tail, **best = NULL; |
||||||
|
|
||||||
|
// align to multiple of c->align
|
||||||
|
width = (width + c->align - 1); |
||||||
|
width -= width % c->align; |
||||||
|
STBRP_ASSERT(width % c->align == 0); |
||||||
|
|
||||||
|
// if it can't possibly fit, bail immediately
|
||||||
|
if (width > c->width || height > c->height) { |
||||||
|
fr.prev_link = NULL; |
||||||
|
fr.x = fr.y = 0; |
||||||
|
return fr; |
||||||
|
} |
||||||
|
|
||||||
|
node = c->active_head; |
||||||
|
prev = &c->active_head; |
||||||
|
while (node->x + width <= c->width) { |
||||||
|
int y,waste; |
||||||
|
y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste); |
||||||
|
if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
|
||||||
|
// bottom left
|
||||||
|
if (y < best_y) { |
||||||
|
best_y = y; |
||||||
|
best = prev; |
||||||
|
} |
||||||
|
} else { |
||||||
|
// best-fit
|
||||||
|
if (y + height <= c->height) { |
||||||
|
// can only use it if it first vertically
|
||||||
|
if (y < best_y || (y == best_y && waste < best_waste)) { |
||||||
|
best_y = y; |
||||||
|
best_waste = waste; |
||||||
|
best = prev; |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
prev = &node->next; |
||||||
|
node = node->next; |
||||||
|
} |
||||||
|
|
||||||
|
best_x = (best == NULL) ? 0 : (*best)->x; |
||||||
|
|
||||||
|
// if doing best-fit (BF), we also have to try aligning right edge to each node position
|
||||||
|
//
|
||||||
|
// e.g, if fitting
|
||||||
|
//
|
||||||
|
// ____________________
|
||||||
|
// |____________________|
|
||||||
|
//
|
||||||
|
// into
|
||||||
|
//
|
||||||
|
// | |
|
||||||
|
// | ____________|
|
||||||
|
// |____________|
|
||||||
|
//
|
||||||
|
// then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
|
||||||
|
//
|
||||||
|
// This makes BF take about 2x the time
|
||||||
|
|
||||||
|
if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) { |
||||||
|
tail = c->active_head; |
||||||
|
node = c->active_head; |
||||||
|
prev = &c->active_head; |
||||||
|
// find first node that's admissible
|
||||||
|
while (tail->x < width) |
||||||
|
tail = tail->next; |
||||||
|
while (tail) { |
||||||
|
int xpos = tail->x - width; |
||||||
|
int y,waste; |
||||||
|
STBRP_ASSERT(xpos >= 0); |
||||||
|
// find the left position that matches this
|
||||||
|
while (node->next->x <= xpos) { |
||||||
|
prev = &node->next; |
||||||
|
node = node->next; |
||||||
|
} |
||||||
|
STBRP_ASSERT(node->next->x > xpos && node->x <= xpos); |
||||||
|
y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste); |
||||||
|
if (y + height <= c->height) { |
||||||
|
if (y <= best_y) { |
||||||
|
if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) { |
||||||
|
best_x = xpos; |
||||||
|
STBRP_ASSERT(y <= best_y); |
||||||
|
best_y = y; |
||||||
|
best_waste = waste; |
||||||
|
best = prev; |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
tail = tail->next; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
fr.prev_link = best; |
||||||
|
fr.x = best_x; |
||||||
|
fr.y = best_y; |
||||||
|
return fr; |
||||||
|
} |
||||||
|
|
||||||
|
static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height) |
||||||
|
{ |
||||||
|
// find best position according to heuristic
|
||||||
|
stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height); |
||||||
|
stbrp_node *node, *cur; |
||||||
|
|
||||||
|
// bail if:
|
||||||
|
// 1. it failed
|
||||||
|
// 2. the best node doesn't fit (we don't always check this)
|
||||||
|
// 3. we're out of memory
|
||||||
|
if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) { |
||||||
|
res.prev_link = NULL; |
||||||
|
return res; |
||||||
|
} |
||||||
|
|
||||||
|
// on success, create new node
|
||||||
|
node = context->free_head; |
||||||
|
node->x = (stbrp_coord) res.x; |
||||||
|
node->y = (stbrp_coord) (res.y + height); |
||||||
|
|
||||||
|
context->free_head = node->next; |
||||||
|
|
||||||
|
// insert the new node into the right starting point, and
|
||||||
|
// let 'cur' point to the remaining nodes needing to be
|
||||||
|
// stiched back in
|
||||||
|
|
||||||
|
cur = *res.prev_link; |
||||||
|
if (cur->x < res.x) { |
||||||
|
// preserve the existing one, so start testing with the next one
|
||||||
|
stbrp_node *next = cur->next; |
||||||
|
cur->next = node; |
||||||
|
cur = next; |
||||||
|
} else { |
||||||
|
*res.prev_link = node; |
||||||
|
} |
||||||
|
|
||||||
|
// from here, traverse cur and free the nodes, until we get to one
|
||||||
|
// that shouldn't be freed
|
||||||
|
while (cur->next && cur->next->x <= res.x + width) { |
||||||
|
stbrp_node *next = cur->next; |
||||||
|
// move the current node to the free list
|
||||||
|
cur->next = context->free_head; |
||||||
|
context->free_head = cur; |
||||||
|
cur = next; |
||||||
|
} |
||||||
|
|
||||||
|
// stitch the list back in
|
||||||
|
node->next = cur; |
||||||
|
|
||||||
|
if (cur->x < res.x + width) |
||||||
|
cur->x = (stbrp_coord) (res.x + width); |
||||||
|
|
||||||
|
#ifdef _DEBUG |
||||||
|
cur = context->active_head; |
||||||
|
while (cur->x < context->width) { |
||||||
|
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. |
||||||
|
------------------------------------------------------------------------------ |
||||||
|
*/ |
||||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,212 @@ |
|||||||
|
#ifndef __STBTTF_H__ |
||||||
|
#define __STBTTF_H__ |
||||||
|
|
||||||
|
#include <SDL2/SDL.h> |
||||||
|
|
||||||
|
#include "stb_rect_pack.h" |
||||||
|
#include "stb_truetype.h" |
||||||
|
|
||||||
|
/* STBTTF: A quick and dirty SDL2 text renderer based on stb_truetype and stdb_rect_pack.
|
||||||
|
* Benoit Favre 2019 |
||||||
|
* |
||||||
|
* This header-only addon to the stb_truetype library allows to draw text with SDL2 from |
||||||
|
* TTF fonts with a similar API to SDL_TTF without the bloat. |
||||||
|
* The renderer is however limited by the integral positioning of SDL blit functions. |
||||||
|
* It also does not parse utf8 text and only prints ASCII characters. |
||||||
|
* |
||||||
|
* This code is public domain. |
||||||
|
*/ |
||||||
|
|
||||||
|
typedef struct { |
||||||
|
stbtt_fontinfo* info; |
||||||
|
stbtt_packedchar* chars; |
||||||
|
SDL_Texture* atlas; |
||||||
|
int texture_size; |
||||||
|
float size; |
||||||
|
float scale; |
||||||
|
int ascent; |
||||||
|
int baseline; |
||||||
|
} STBTTF_Font; |
||||||
|
|
||||||
|
/* Release the memory and textures associated with a font */ |
||||||
|
void STBTTF_CloseFont(STBTTF_Font* font); |
||||||
|
|
||||||
|
/* Open a TTF font given a SDL abstract IO handler, for a given renderer and a given font size.
|
||||||
|
* Returns NULL on failure. The font must be deallocated with STBTTF_CloseFont when not used anymore. |
||||||
|
* This function creates a texture atlas with prerendered ASCII characters (32-128). |
||||||
|
*/
|
||||||
|
STBTTF_Font* STBTTF_OpenFontRW(SDL_Renderer* renderer, SDL_RWops* rw, float size); |
||||||
|
|
||||||
|
/* Open a TTF font given a filename, for a given renderer and a given font size.
|
||||||
|
* Convinience function which calls STBTTF_OpenFontRW. |
||||||
|
*/ |
||||||
|
STBTTF_Font* STBTTF_OpenFont(SDL_Renderer* renderer, const char* filename, float size); |
||||||
|
|
||||||
|
/* Draw some text using the renderer draw color at location (x, y).
|
||||||
|
* Characters are copied from the texture atlas using the renderer SDL_RenderCopy function. |
||||||
|
* Since that function only supports integral coordinates, the result is not great. |
||||||
|
* Only ASCII characters (32 <= c < 128) are supported. Anything outside this range is ignored. |
||||||
|
*/ |
||||||
|
void STBTTF_RenderText(SDL_Renderer* renderer, STBTTF_Font* font, float x, float y, const char *text); |
||||||
|
|
||||||
|
/* Return the length in pixels of a text.
|
||||||
|
* You can get the height of a line by using font->baseline. |
||||||
|
*/ |
||||||
|
float STBTTF_MeasureText(STBTTF_Font* font, const char *text); |
||||||
|
|
||||||
|
#ifdef STBTTF_IMPLEMENTATION |
||||||
|
|
||||||
|
void STBTTF_CloseFont(STBTTF_Font* font) { |
||||||
|
if(font->atlas) SDL_DestroyTexture(font->atlas); |
||||||
|
if(font->info) free(font->info); |
||||||
|
if(font->chars) free(font->chars); |
||||||
|
free(font); |
||||||
|
} |
||||||
|
|
||||||
|
STBTTF_Font* STBTTF_OpenFontRW(SDL_Renderer* renderer, SDL_RWops* rw, float size) { |
||||||
|
Sint64 file_size = SDL_RWsize(rw); |
||||||
|
unsigned char* buffer = malloc(file_size); |
||||||
|
if(SDL_RWread(rw, buffer, file_size, 1) != 1) return NULL; |
||||||
|
SDL_RWclose(rw); |
||||||
|
|
||||||
|
STBTTF_Font* font = calloc(sizeof(STBTTF_Font), 1); |
||||||
|
font->info = malloc(sizeof(stbtt_fontinfo)); |
||||||
|
font->chars = malloc(sizeof(stbtt_packedchar) * 96); |
||||||
|
|
||||||
|
if(stbtt_InitFont(font->info, buffer, 0) == 0) { |
||||||
|
free(buffer); |
||||||
|
STBTTF_CloseFont(font); |
||||||
|
return NULL; |
||||||
|
} |
||||||
|
|
||||||
|
// fill bitmap atlas with packed characters
|
||||||
|
unsigned char* bitmap = NULL; |
||||||
|
font->texture_size = 32; |
||||||
|
while(1) { |
||||||
|
bitmap = malloc(font->texture_size * font->texture_size); |
||||||
|
stbtt_pack_context pack_context; |
||||||
|
stbtt_PackBegin(&pack_context, bitmap, font->texture_size, font->texture_size, 0, 1, 0); |
||||||
|
stbtt_PackSetOversampling(&pack_context, 1, 1); |
||||||
|
if(!stbtt_PackFontRange(&pack_context, buffer, 0, size, 32, 95, font->chars)) { |
||||||
|
// too small
|
||||||
|
free(bitmap); |
||||||
|
stbtt_PackEnd(&pack_context); |
||||||
|
font->texture_size *= 2; |
||||||
|
} else { |
||||||
|
stbtt_PackEnd(&pack_context); |
||||||
|
break; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
// convert bitmap to texture
|
||||||
|
font->atlas = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STATIC, font->texture_size, font->texture_size); |
||||||
|
SDL_SetTextureBlendMode(font->atlas, SDL_BLENDMODE_BLEND); |
||||||
|
|
||||||
|
Uint32* pixels = malloc(font->texture_size * font->texture_size * sizeof(Uint32)); |
||||||
|
static SDL_PixelFormat* format = NULL; |
||||||
|
if(format == NULL) format = SDL_AllocFormat(SDL_PIXELFORMAT_RGBA32); |
||||||
|
for(int i = 0; i < font->texture_size * font->texture_size; i++) { |
||||||
|
pixels[i] = SDL_MapRGBA(format, 0xff, 0xff, 0xff, bitmap[i]); |
||||||
|
} |
||||||
|
SDL_UpdateTexture(font->atlas, NULL, pixels, font->texture_size * sizeof(Uint32)); |
||||||
|
free(pixels); |
||||||
|
free(bitmap); |
||||||
|
|
||||||
|
// setup additional info
|
||||||
|
font->scale = stbtt_ScaleForPixelHeight(font->info, size); |
||||||
|
stbtt_GetFontVMetrics(font->info, &font->ascent, 0, 0); |
||||||
|
font->baseline = (int) (font->ascent * font->scale); |
||||||
|
|
||||||
|
free(buffer); |
||||||
|
|
||||||
|
return font; |
||||||
|
} |
||||||
|
|
||||||
|
STBTTF_Font* STBTTF_OpenFont(SDL_Renderer* renderer, const char* filename, float size) { |
||||||
|
SDL_RWops *rw = SDL_RWFromFile(filename, "rb"); |
||||||
|
if(rw == NULL) return NULL; |
||||||
|
return STBTTF_OpenFontRW(renderer, rw, size); |
||||||
|
} |
||||||
|
|
||||||
|
void STBTTF_RenderText(SDL_Renderer* renderer, STBTTF_Font* font, float x, float y, const char *text) { |
||||||
|
Uint8 r, g, b, a; |
||||||
|
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a); |
||||||
|
SDL_SetTextureColorMod(font->atlas, r, g, b); |
||||||
|
SDL_SetTextureAlphaMod(font->atlas, a); |
||||||
|
for(int i = 0; text[i]; i++) { |
||||||
|
if (text[i] >= 32 && text[i] < 128) { |
||||||
|
//if(i > 0) x += stbtt_GetCodepointKernAdvance(font->info, text[i - 1], text[i]) * font->scale;
|
||||||
|
|
||||||
|
stbtt_packedchar* info = &font->chars[text[i] - 32]; |
||||||
|
SDL_Rect src_rect = {info->x0, info->y0, info->x1 - info->x0, info->y1 - info->y0}; |
||||||
|
SDL_Rect dst_rect = {x + info->xoff, y + info->yoff, info->x1 - info->x0, info->y1 - info->y0}; |
||||||
|
|
||||||
|
SDL_RenderCopy(renderer, font->atlas, &src_rect, &dst_rect); |
||||||
|
x += info->xadvance; |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
float STBTTF_MeasureText(STBTTF_Font* font, const char *text) { |
||||||
|
float width = 0; |
||||||
|
for(int i = 0; text[i]; i++) { |
||||||
|
if (text[i] >= 32 && text[i] < 128) { |
||||||
|
//if(i > 0) width += stbtt_GetCodepointKernAdvance(font->info, text[i - 1], text[i]) * font->scale;
|
||||||
|
|
||||||
|
stbtt_packedchar* info = &font->chars[text[i] - 32]; |
||||||
|
width += info->xadvance; |
||||||
|
} |
||||||
|
} |
||||||
|
return width; |
||||||
|
} |
||||||
|
|
||||||
|
/*******************
|
||||||
|
* Example program * |
||||||
|
******************* |
||||||
|
|
||||||
|
#include <stdio.h> |
||||||
|
|
||||||
|
#define STB_RECT_PACK_IMPLEMENTATION |
||||||
|
#define STB_TRUETYPE_IMPLEMENTATION |
||||||
|
#define STBTTF_IMPLEMENTATION |
||||||
|
|
||||||
|
#include "stbttf.h" |
||||||
|
|
||||||
|
int main(int argc, char** argv) { |
||||||
|
if(argc != 2) { |
||||||
|
fprintf(stderr, "usage: %s <font>\n", argv[0]); |
||||||
|
exit(1); |
||||||
|
} |
||||||
|
SDL_Init(SDL_INIT_VIDEO); |
||||||
|
SDL_Window* window = SDL_CreateWindow("stbttf", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL); |
||||||
|
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED); |
||||||
|
SDL_RenderSetLogicalSize(renderer, 640, 480); |
||||||
|
SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND); |
||||||
|
|
||||||
|
STBTTF_Font* font = STBTTF_OpenFont(renderer, argv[1], 32); |
||||||
|
|
||||||
|
while(1) { |
||||||
|
SDL_Event event; |
||||||
|
while(SDL_PollEvent(&event)) { |
||||||
|
if(event.type == SDL_QUIT) exit(0); |
||||||
|
} |
||||||
|
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); |
||||||
|
SDL_RenderClear(renderer); |
||||||
|
// set color and render some text
|
||||||
|
SDL_SetRenderDrawColor(renderer, 128, 0, 0, 255); |
||||||
|
STBTTF_RenderText(renderer, font, 50, 50, "This is a test"); |
||||||
|
// render the atlas to check its content
|
||||||
|
//SDL_Rect dest = {0, 0, font->texturesize, font->texturesize};
|
||||||
|
//SDL_RenderCopy(renderer, font->atlas, &dest, &dest);
|
||||||
|
SDL_RenderPresent(renderer); |
||||||
|
SDL_Delay(1000 / 60); |
||||||
|
} |
||||||
|
STBTTF_CloseFont(font); |
||||||
|
SDL_Quit(); |
||||||
|
} |
||||||
|
|
||||||
|
*/ |
||||||
|
|
||||||
|
#endif |
||||||
|
|
||||||
|
#endif |
||||||
Loading…
Reference in new issue