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cute_aseprite.h
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/*
------------------------------------------------------------------------------
Licensing information can be found at the end of the file.
------------------------------------------------------------------------------
cute_aseprite.h - v1.02
To create implementation (the function definitions)
#define CUTE_ASEPRITE_IMPLEMENTATION
in *one* C/CPP file (translation unit) that includes this file
SUMMARY
cute_asesprite.h is a single-file header that implements some functions to
parse .ase/.aseprite files. The entire file is parsed all at once and some
structs are filled out then handed back to you.
LIMITATIONS
Only the "normal" blend mode for layers is supported. As a workaround try
using the "merge down" function in Aseprite to create a normal layer.
Supporting all blend modes would take too much code to be worth it.
Does not support very old versions of Aseprite (with old palette chunks
0x0004 or 0x0011). Also does not support deprecrated mask chunk.
sRGB and ICC profiles are parsed but completely ignored when blending
frames together. If you want these to be used when composing frames you
have to do this yourself.
SPECIAL THANKS
Special thanks to Noel Berry for the blend code in his reference C++
implementation (https://github.com/NoelFB/blah).
Special thanks to Richard Mitton for the initial implementation of the
zlib inflater.
Revision history:
1.00 (08/25/2020) initial release
1.01 (08/31/2020) fixed memleaks, tag parsing bug (crash), blend bugs
1.02 (02/05/2022) fixed icc profile parse bug, support transparent pal-
ette index, can parse 1.3 files (no tileset support)
*/
/*
DOCUMENTATION
Simply load an .ase or .aseprite file from disk or from memory like so.
ase_t* ase = cute_aseprite_load_from_file("data/player.aseprite", NULL);
Then access the fields directly, assuming you have your own `Animation` type.
int w = ase->w;
int h = ase->h;
Animation anim = { 0 }; // Your custom animation data type.
for (int i = 0; i < ase->frame_count; ++i) {
ase_frame_t* frame = ase->frames + i;
anim.add_frame(frame->duration, frame->pixels);
}
Then free it up when done.
cute_aseprite_free(ase);
DATA STRUCTURES
Aseprite files have frames, layers, and cels. A single frame is one frame of an
animation, formed by blending all the cels of an animation together. There is
one cel per layer per frame. Each cel contains its own pixel data.
The frame's pixels are automatically assumed to have been blended by the `normal`
blend mode. A warning is emit if any other blend mode is encountered. Feel free
to update the pixels of each frame with your own implementation of blending
functions. The frame's pixels are merely provided like this for convenience.
BUGS AND CRASHES
This header is quite new and it takes time to test all the parse paths. Don't be
shy about opening a GitHub issue if there's a crash! It's quite easy to update
the parser as long as you upload your .ase file that shows the bug.
https://github.com/RandyGaul/cute_headers/issues
*/
#ifndef CUTE_ASEPRITE_H
#define CUTE_ASEPRITE_H
typedef struct ase_t ase_t;
ase_t* cute_aseprite_load_from_file(const char* path, void* mem_ctx);
ase_t* cute_aseprite_load_from_memory(const void* memory, int size, void* mem_ctx);
void cute_aseprite_free(ase_t* aseprite);
#define CUTE_ASEPRITE_MAX_LAYERS (64)
#define CUTE_ASEPRITE_MAX_SLICES (128)
#define CUTE_ASEPRITE_MAX_PALETTE_ENTRIES (1024)
#define CUTE_ASEPRITE_MAX_TAGS (256)
#include <stdint.h>
typedef struct ase_color_t ase_color_t;
typedef struct ase_frame_t ase_frame_t;
typedef struct ase_layer_t ase_layer_t;
typedef struct ase_cel_t ase_cel_t;
typedef struct ase_tag_t ase_tag_t;
typedef struct ase_slice_t ase_slice_t;
typedef struct ase_palette_entry_t ase_palette_entry_t;
typedef struct ase_palette_t ase_palette_t;
typedef struct ase_udata_t ase_udata_t;
typedef struct ase_cel_extra_chunk_t ase_cel_extra_chunk_t;
typedef struct ase_color_profile_t ase_color_profile_t;
typedef struct ase_fixed_t ase_fixed_t;
typedef struct ase_cel_extra_chunk_t ase_cel_extra_chunk_t;
struct ase_color_t
{
uint8_t r, g, b, a;
};
struct ase_fixed_t
{
uint16_t a;
uint16_t b;
};
struct ase_udata_t
{
int has_color;
ase_color_t color;
int has_text;
const char* text;
};
typedef enum ase_layer_flags_t
{
ASE_LAYER_FLAGS_VISIBLE = 0x01,
ASE_LAYER_FLAGS_EDITABLE = 0x02,
ASE_LAYER_FLAGS_LOCK_MOVEMENT = 0x04,
ASE_LAYER_FLAGS_BACKGROUND = 0x08,
ASE_LAYER_FLAGS_PREFER_LINKED_CELS = 0x10,
ASE_LAYER_FLAGS_COLLAPSED = 0x20,
ASE_LAYER_FLAGS_REFERENCE = 0x40,
} ase_layer_flags_t;
typedef enum ase_layer_type_t
{
ASE_LAYER_TYPE_NORMAL,
ASE_LAYER_TYPE_GROUP,
} ase_layer_type_t;
struct ase_layer_t
{
ase_layer_flags_t flags;
ase_layer_type_t type;
const char* name;
ase_layer_t* parent;
float opacity;
ase_udata_t udata;
};
struct ase_cel_extra_chunk_t
{
int precise_bounds_are_set;
ase_fixed_t precise_x;
ase_fixed_t precise_y;
ase_fixed_t w, h;
};
struct ase_cel_t
{
ase_layer_t* layer;
void* pixels;
int w, h;
int x, y;
float opacity;
int is_linked;
uint16_t linked_frame_index;
int has_extra;
ase_cel_extra_chunk_t extra;
ase_udata_t udata;
};
struct ase_frame_t
{
ase_t* ase;
int duration_milliseconds;
ase_color_t* pixels;
int cel_count;
ase_cel_t cels[CUTE_ASEPRITE_MAX_LAYERS];
};
typedef enum ase_animation_direction_t
{
ASE_ANIMATION_DIRECTION_FORWARDS,
ASE_ANIMATION_DIRECTION_BACKWORDS,
ASE_ANIMATION_DIRECTION_PINGPONG,
} ase_animation_direction_t;
struct ase_tag_t
{
int from_frame;
int to_frame;
ase_animation_direction_t loop_animation_direction;
uint8_t r, g, b;
const char* name;
ase_udata_t udata;
};
struct ase_slice_t
{
const char* name;
int frame_number;
int origin_x;
int origin_y;
int w, h;
int has_center_as_9_slice;
int center_x;
int center_y;
int center_w;
int center_h;
int has_pivot;
int pivot_x;
int pivot_y;
ase_udata_t udata;
};
struct ase_palette_entry_t
{
ase_color_t color;
const char* color_name;
};
struct ase_palette_t
{
int entry_count;
ase_palette_entry_t entries[CUTE_ASEPRITE_MAX_PALETTE_ENTRIES];
};
typedef enum ase_color_profile_type_t
{
ASE_COLOR_PROFILE_TYPE_NONE,
ASE_COLOR_PROFILE_TYPE_SRGB,
ASE_COLOR_PROFILE_TYPE_EMBEDDED_ICC,
} ase_color_profile_type_t;
struct ase_color_profile_t
{
ase_color_profile_type_t type;
int use_fixed_gamma;
ase_fixed_t gamma;
uint32_t icc_profile_data_length;
void* icc_profile_data;
};
typedef enum ase_mode_t
{
ASE_MODE_RGBA,
ASE_MODE_GRAYSCALE,
ASE_MODE_INDEXED
} ase_mode_t;
struct ase_t
{
ase_mode_t mode;
int w, h;
int transparent_palette_entry_index;
int number_of_colors;
int pixel_w;
int pixel_h;
int grid_x;
int grid_y;
int grid_w;
int grid_h;
int has_color_profile;
ase_color_profile_t color_profile;
ase_palette_t palette;
int layer_count;
ase_layer_t layers[CUTE_ASEPRITE_MAX_LAYERS];
int frame_count;
ase_frame_t* frames;
int tag_count;
ase_tag_t tags[CUTE_ASEPRITE_MAX_TAGS];
int slice_count;
ase_slice_t slices[CUTE_ASEPRITE_MAX_SLICES];
void* mem_ctx;
};
#endif // CUTE_ASEPRITE_H
#ifdef CUTE_ASEPRITE_IMPLEMENTATION
#ifndef CUTE_ASEPRITE_IMPLEMENTATION_ONCE
#define CUTE_ASEPRITE_IMPLEMENTATION_ONCE
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#ifndef _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_NONSTDC_NO_DEPRECATE
#endif
#if !defined(CUTE_ASEPRITE_ALLOC)
#include <stdlib.h>
#define CUTE_ASEPRITE_ALLOC(size, ctx) malloc(size)
#define CUTE_ASEPRITE_FREE(mem, ctx) free(mem)
#endif
#if !defined(CUTE_ASEPRITE_UNUSED)
#if defined(_MSC_VER)
#define CUTE_ASEPRITE_UNUSED(x) (void)x
#else
#define CUTE_ASEPRITE_UNUSED(x) (void)(sizeof(x))
#endif
#endif
#if !defined(CUTE_ASEPRITE_MEMCPY)
#include <string.h> // memcpy
#define CUTE_ASEPRITE_MEMCPY memcpy
#endif
#if !defined(CUTE_ASEPRITE_MEMSET)
#include <string.h> // memset
#define CUTE_ASEPRITE_MEMSET memset
#endif
#if !defined(CUTE_ASEPRITE_ASSERT)
#include <assert.h>
#define CUTE_ASEPRITE_ASSERT assert
#endif
#if !defined(CUTE_ASEPRITE_STDIO)
#include <stdio.h> // fopen
#define CUTE_ASEPRITE_STDIO
#define CUTE_ASEPRITE_SEEK_SET SEEK_SET
#define CUTE_ASEPRITE_SEEK_END SEEK_END
#define CUTE_ASEPRITE_FILE FILE
#define CUTE_ASEPRITE_FOPEN fopen
#define CUTE_ASEPRITE_FSEEK fseek
#define CUTE_ASEPRITE_FREAD fread
#define CUTE_ASEPRITE_FTELL ftell
#define CUTE_ASEPRITE_FCLOSE fclose
#endif
static const char* s_error_file = NULL; // The filepath of the file being parsed. NULL if from memory.
static const char* s_error_reason; // Used to capture errors during DEFLATE parsing.
#if !defined(CUTE_ASEPRITE_WARNING)
#define CUTE_ASEPRITE_WARNING(msg) cute_aseprite_warning(msg, __LINE__)
static int s_error_cline; // The line in cute_aseprite.h where the error was triggered.
void cute_aseprite_warning(const char* warning, int line)
{
s_error_cline = line;
const char *error_file = s_error_file ? s_error_file : "MEMORY";
printf("WARNING (cute_aseprite.h:%i): %s (%s)\n", s_error_cline, warning, error_file);
}
#endif
#define CUTE_ASEPRITE_FAIL() do { goto ase_err; } while (0)
#define CUTE_ASEPRITE_CHECK(X, Y) do { if (!(X)) { s_error_reason = Y; CUTE_ASEPRITE_FAIL(); } } while (0)
#define CUTE_ASEPRITE_CALL(X) do { if (!(X)) goto ase_err; } while (0)
#define CUTE_ASEPRITE_DEFLATE_MAX_BITLEN 15
// DEFLATE tables from RFC 1951
static uint8_t s_fixed_table[288 + 32] = {
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
}; // 3.2.6
static uint8_t s_permutation_order[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; // 3.2.7
static uint8_t s_len_extra_bits[29 + 2] = { 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0, 0,0 }; // 3.2.5
static uint32_t s_len_base[29 + 2] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 0,0 }; // 3.2.5
static uint8_t s_dist_extra_bits[30 + 2] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13, 0,0 }; // 3.2.5
static uint32_t s_dist_base[30 + 2] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 0,0 }; // 3.2.5
typedef struct deflate_t
{
uint64_t bits;
int count;
uint32_t* words;
int word_count;
int word_index;
int bits_left;
int final_word_available;
uint32_t final_word;
char* out;
char* out_end;
char* begin;
uint32_t lit[288];
uint32_t dst[32];
uint32_t len[19];
uint32_t nlit;
uint32_t ndst;
uint32_t nlen;
} deflate_t;
static int s_would_overflow(deflate_t* s, int num_bits)
{
return (s->bits_left + s->count) - num_bits < 0;
}
static char* s_ptr(deflate_t* s)
{
CUTE_ASEPRITE_ASSERT(!(s->bits_left & 7));
return (char*)(s->words + s->word_index) - (s->count / 8);
}
static uint64_t s_peak_bits(deflate_t* s, int num_bits_to_read)
{
if (s->count < num_bits_to_read)
{
if (s->word_index < s->word_count)
{
uint32_t word = s->words[s->word_index++];
s->bits |= (uint64_t)word << s->count;
s->count += 32;
CUTE_ASEPRITE_ASSERT(s->word_index <= s->word_count);
}
else if (s->final_word_available)
{
uint32_t word = s->final_word;
s->bits |= (uint64_t)word << s->count;
s->count += s->bits_left;
s->final_word_available = 0;
}
}
return s->bits;
}
static uint32_t s_consume_bits(deflate_t* s, int num_bits_to_read)
{
CUTE_ASEPRITE_ASSERT(s->count >= num_bits_to_read);
uint32_t bits = (uint32_t)(s->bits & (((uint64_t)1 << num_bits_to_read) - 1));
s->bits >>= num_bits_to_read;
s->count -= num_bits_to_read;
s->bits_left -= num_bits_to_read;
return bits;
}
static uint32_t s_read_bits(deflate_t* s, int num_bits_to_read)
{
CUTE_ASEPRITE_ASSERT(num_bits_to_read <= 32);
CUTE_ASEPRITE_ASSERT(num_bits_to_read >= 0);
CUTE_ASEPRITE_ASSERT(s->bits_left > 0);
CUTE_ASEPRITE_ASSERT(s->count <= 64);
CUTE_ASEPRITE_ASSERT(!s_would_overflow(s, num_bits_to_read));
s_peak_bits(s, num_bits_to_read);
uint32_t bits = s_consume_bits(s, num_bits_to_read);
return bits;
}
static uint32_t s_rev16(uint32_t a)
{
a = ((a & 0xAAAA) >> 1) | ((a & 0x5555) << 1);
a = ((a & 0xCCCC) >> 2) | ((a & 0x3333) << 2);
a = ((a & 0xF0F0) >> 4) | ((a & 0x0F0F) << 4);
a = ((a & 0xFF00) >> 8) | ((a & 0x00FF) << 8);
return a;
}
// RFC 1951 section 3.2.2
static uint32_t s_build(deflate_t* s, uint32_t* tree, uint8_t* lens, int sym_count)
{
int n, codes[16], first[16], counts[16] = { 0 };
CUTE_ASEPRITE_UNUSED(s);
// Frequency count
for (n = 0; n < sym_count; n++) counts[lens[n]]++;
// Distribute codes
counts[0] = codes[0] = first[0] = 0;
for (n = 1; n <= 15; ++n)
{
codes[n] = (codes[n - 1] + counts[n - 1]) << 1;
first[n] = first[n - 1] + counts[n - 1];
}
for (int i = 0; i < sym_count; ++i)
{
uint8_t len = lens[i];
if (len != 0)
{
CUTE_ASEPRITE_ASSERT(len < 16);
uint32_t code = (uint32_t)codes[len]++;
uint32_t slot = (uint32_t)first[len]++;
tree[slot] = (code << (32 - (uint32_t)len)) | (i << 4) | len;
}
}
return (uint32_t)first[15];
}
static int s_stored(deflate_t* s)
{
char* p;
// 3.2.3
// skip any remaining bits in current partially processed byte
s_read_bits(s, s->count & 7);
// 3.2.4
// read LEN and NLEN, should complement each other
uint16_t LEN = (uint16_t)s_read_bits(s, 16);
uint16_t NLEN = (uint16_t)s_read_bits(s, 16);
CUTE_ASEPRITE_CHECK(LEN == (uint16_t)(~NLEN), "Failed to find LEN and NLEN as complements within stored (uncompressed) stream.");
CUTE_ASEPRITE_CHECK(s->bits_left / 8 <= (int)LEN, "Stored block extends beyond end of input stream.");
p = s_ptr(s);
CUTE_ASEPRITE_MEMCPY(s->out, p, LEN);
s->out += LEN;
return 1;
ase_err:
return 0;
}
// 3.2.6
static int s_fixed(deflate_t* s)
{
s->nlit = s_build(s, s->lit, s_fixed_table, 288);
s->ndst = s_build(0, s->dst, s_fixed_table + 288, 32);
return 1;
}
static int s_decode(deflate_t* s, uint32_t* tree, int hi)
{
uint64_t bits = s_peak_bits(s, 16);
uint32_t search = (s_rev16((uint32_t)bits) << 16) | 0xFFFF;
int lo = 0;
while (lo < hi)
{
int guess = (lo + hi) >> 1;
if (search < tree[guess]) hi = guess;
else lo = guess + 1;
}
uint32_t key = tree[lo - 1];
uint32_t len = (32 - (key & 0xF));
CUTE_ASEPRITE_ASSERT((search >> len) == (key >> len));
s_consume_bits(s, key & 0xF);
return (key >> 4) & 0xFFF;
}
// 3.2.7
static int s_dynamic(deflate_t* s)
{
uint8_t lenlens[19] = { 0 };
uint32_t nlit = 257 + s_read_bits(s, 5);
uint32_t ndst = 1 + s_read_bits(s, 5);
uint32_t nlen = 4 + s_read_bits(s, 4);
for (uint32_t i = 0 ; i < nlen; ++i)
lenlens[s_permutation_order[i]] = (uint8_t)s_read_bits(s, 3);
// Build the tree for decoding code lengths
s->nlen = s_build(0, s->len, lenlens, 19);
uint8_t lens[288 + 32];
for (uint32_t n = 0; n < nlit + ndst;)
{
int sym = s_decode(s, s->len, (int)s->nlen);
switch (sym)
{
case 16: for (uint32_t i = 3 + s_read_bits(s, 2); i; --i, ++n) lens[n] = lens[n - 1]; break;
case 17: for (uint32_t i = 3 + s_read_bits(s, 3); i; --i, ++n) lens[n] = 0; break;
case 18: for (uint32_t i = 11 + s_read_bits(s, 7); i; --i, ++n) lens[n] = 0; break;
default: lens[n++] = (uint8_t)sym; break;
}
}
s->nlit = s_build(s, s->lit, lens, (int)nlit);
s->ndst = s_build(0, s->dst, lens + nlit, (int)ndst);
return 1;
}
// 3.2.3
static int s_block(deflate_t* s)
{
while (1)
{
int symbol = s_decode(s, s->lit, (int)s->nlit);
if (symbol < 256)
{
CUTE_ASEPRITE_CHECK(s->out + 1 <= s->out_end, "Attempted to overwrite out buffer while outputting a symbol.");
*s->out = (char)symbol;
s->out += 1;
}
else if (symbol > 256)
{
symbol -= 257;
uint32_t length = s_read_bits(s, (int)(s_len_extra_bits[symbol])) + s_len_base[symbol];
int distance_symbol = s_decode(s, s->dst, (int)s->ndst);
uint32_t backwards_distance = s_read_bits(s, s_dist_extra_bits[distance_symbol]) + s_dist_base[distance_symbol];
CUTE_ASEPRITE_CHECK(s->out - backwards_distance >= s->begin, "Attempted to write before out buffer (invalid backwards distance).");
CUTE_ASEPRITE_CHECK(s->out + length <= s->out_end, "Attempted to overwrite out buffer while outputting a string.");
char* src = s->out - backwards_distance;
char* dst = s->out;
s->out += length;
switch (backwards_distance)
{
case 1: // very common in images
CUTE_ASEPRITE_MEMSET(dst, *src, (size_t)length);
break;
default: while (length--) *dst++ = *src++;
}
}
else break;
}
return 1;
ase_err:
return 0;
}
// 3.2.3
static int s_inflate(const void* in, int in_bytes, void* out, int out_bytes, void* mem_ctx)
{
CUTE_ASEPRITE_UNUSED(mem_ctx);
deflate_t* s = (deflate_t*)CUTE_ASEPRITE_ALLOC(sizeof(deflate_t), mem_ctx);
s->bits = 0;
s->count = 0;
s->word_index = 0;
s->bits_left = in_bytes * 8;
// s->words is the in-pointer rounded up to a multiple of 4
int first_bytes = (int)((((size_t)in + 3) & ~3) - (size_t)in);
s->words = (uint32_t*)((char*)in + first_bytes);
s->word_count = (in_bytes - first_bytes) / 4;
int last_bytes = ((in_bytes - first_bytes) & 3);
for (int i = 0; i < first_bytes; ++i)
s->bits |= (uint64_t)(((uint8_t*)in)[i]) << (i * 8);
s->final_word_available = last_bytes ? 1 : 0;
s->final_word = 0;
for(int i = 0; i < last_bytes; i++)
s->final_word |= ((uint8_t*)in)[in_bytes - last_bytes + i] << (i * 8);
s->count = first_bytes * 8;
s->out = (char*)out;
s->out_end = s->out + out_bytes;
s->begin = (char*)out;
int count = 0;
uint32_t bfinal;
do
{
bfinal = s_read_bits(s, 1);
uint32_t btype = s_read_bits(s, 2);
switch (btype)
{
case 0: CUTE_ASEPRITE_CALL(s_stored(s)); break;
case 1: s_fixed(s); CUTE_ASEPRITE_CALL(s_block(s)); break;
case 2: s_dynamic(s); CUTE_ASEPRITE_CALL(s_block(s)); break;
case 3: CUTE_ASEPRITE_CHECK(0, "Detected unknown block type within input stream.");
}
++count;
}
while (!bfinal);
CUTE_ASEPRITE_FREE(s, mem_ctx);
return 1;
ase_err:
CUTE_ASEPRITE_FREE(s, mem_ctx);
return 0;
}
typedef struct ase_state_t
{
uint8_t* in;
uint8_t* end;
void* mem_ctx;
} ase_state_t;
static uint8_t s_read_uint8(ase_state_t* s)
{
CUTE_ASEPRITE_ASSERT(s->in <= s->end + sizeof(uint8_t));
uint8_t** p = &s->in;
uint8_t value = **p;
++(*p);
return value;
}
static uint16_t s_read_uint16(ase_state_t* s)
{
CUTE_ASEPRITE_ASSERT(s->in <= s->end + sizeof(uint16_t));
uint8_t** p = &s->in;
uint16_t value;
value = (*p)[0];
value |= (((uint16_t)((*p)[1])) << 8);
*p += 2;
return value;
}
static ase_fixed_t s_read_fixed(ase_state_t* s)
{
ase_fixed_t value;
value.a = s_read_uint16(s);
value.b = s_read_uint16(s);
return value;
}
static uint32_t s_read_uint32(ase_state_t* s)
{
CUTE_ASEPRITE_ASSERT(s->in <= s->end + sizeof(uint32_t));
uint8_t** p = &s->in;
uint32_t value;
value = (*p)[0];
value |= (((uint32_t)((*p)[1])) << 8);
value |= (((uint32_t)((*p)[2])) << 16);
value |= (((uint32_t)((*p)[3])) << 24);
*p += 4;
return value;
}
#ifdef CUTE_ASPRITE_S_READ_UINT64
// s_read_uint64() is not currently used.
static uint64_t s_read_uint64(ase_state_t* s)
{
CUTE_ASEPRITE_ASSERT(s->in <= s->end + sizeof(uint64_t));
uint8_t** p = &s->in;
uint64_t value;
value = (*p)[0];
value |= (((uint64_t)((*p)[1])) << 8 );
value |= (((uint64_t)((*p)[2])) << 16);
value |= (((uint64_t)((*p)[3])) << 24);
value |= (((uint64_t)((*p)[4])) << 32);
value |= (((uint64_t)((*p)[5])) << 40);
value |= (((uint64_t)((*p)[6])) << 48);
value |= (((uint64_t)((*p)[7])) << 56);
*p += 8;
return value;
}
#endif
static int16_t s_read_int16(ase_state_t* s) { return (int16_t)s_read_uint16(s); }
static int16_t s_read_int32(ase_state_t* s) { return (int32_t)s_read_uint32(s); }
#ifdef CUTE_ASPRITE_S_READ_BYTES
// s_read_bytes() is not currently used.
static void s_read_bytes(ase_state_t* s, uint8_t* bytes, int num_bytes)
{
for (int i = 0; i < num_bytes; ++i) {
bytes[i] = s_read_uint8(s);
}
}
#endif
static const char* s_read_string(ase_state_t* s)
{
int len = (int)s_read_uint16(s);
char* bytes = (char*)CUTE_ASEPRITE_ALLOC(len + 1, s->mem_ctx);
for (int i = 0; i < len; ++i) {
bytes[i] = (char)s_read_uint8(s);
}
bytes[len] = 0;
return bytes;
}
static void s_skip(ase_state_t* ase, int num_bytes)
{
CUTE_ASEPRITE_ASSERT(ase->in <= ase->end + num_bytes);
ase->in += num_bytes;
}
static char* s_fopen(const char* path, int* size, void* mem_ctx)
{
CUTE_ASEPRITE_UNUSED(mem_ctx);
char* data = 0;
CUTE_ASEPRITE_FILE* fp = CUTE_ASEPRITE_FOPEN(path, "rb");
int sz = 0;
if (fp)
{
CUTE_ASEPRITE_FSEEK(fp, 0, CUTE_ASEPRITE_SEEK_END);
sz = CUTE_ASEPRITE_FTELL(fp);
CUTE_ASEPRITE_FSEEK(fp, 0, CUTE_ASEPRITE_SEEK_SET);
data = (char*)CUTE_ASEPRITE_ALLOC(sz + 1, mem_ctx);
CUTE_ASEPRITE_FREAD(data, sz, 1, fp);
data[sz] = 0;
CUTE_ASEPRITE_FCLOSE(fp);
}
if (size) *size = sz;
return data;
}
ase_t* cute_aseprite_load_from_file(const char* path, void* mem_ctx)
{
s_error_file = path;
int sz;
void* file = s_fopen(path, &sz, mem_ctx);
if (!file) {
CUTE_ASEPRITE_WARNING("Unable to find map file.");
return NULL;
}
ase_t* aseprite = cute_aseprite_load_from_memory(file, sz, mem_ctx);
CUTE_ASEPRITE_FREE(file, mem_ctx);
s_error_file = NULL;
return aseprite;
}
static int s_mul_un8(int a, int b)
{
int t = (a * b) + 0x80;
return (((t >> 8) + t) >> 8);
}
static ase_color_t s_blend(ase_color_t src, ase_color_t dst, uint8_t opacity)
{
src.a = (uint8_t)s_mul_un8(src.a, opacity);
int a = src.a + dst.a - s_mul_un8(src.a, dst.a);
int r, g, b;
if (a == 0) {
r = g = b = 0;
} else {
r = dst.r + (src.r - dst.r) * src.a / a;
g = dst.g + (src.g - dst.g) * src.a / a;
b = dst.b + (src.b - dst.b) * src.a / a;
}
ase_color_t ret = { (uint8_t)r, (uint8_t)g, (uint8_t)b, (uint8_t)a };
return ret;
}
static int s_min(int a, int b)
{
return a < b ? a : b;
}
static int s_max(int a, int b)
{
return a < b ? b : a;
}
static ase_color_t s_color(ase_t* ase, void* src, int index)
{
ase_color_t result;
if (ase->mode == ASE_MODE_RGBA) {
result = ((ase_color_t*)src)[index];
} else if (ase->mode == ASE_MODE_GRAYSCALE) {
uint8_t saturation = ((uint8_t*)src)[index * 2];
uint8_t a = ((uint8_t*)src)[index * 2 + 1];
result.r = result.g = result.b = saturation;
result.a = a;
} else {
CUTE_ASEPRITE_ASSERT(ase->mode == ASE_MODE_INDEXED);
uint8_t palette_index = ((uint8_t*)src)[index];
if (palette_index == ase->transparent_palette_entry_index) {
result.r = 0;
result.g = 0;
result.b = 0;
result.a = 0;
} else {
result = ase->palette.entries[palette_index].color;
}
}
return result;
}
ase_t* cute_aseprite_load_from_memory(const void* memory, int size, void* mem_ctx)
{
ase_t* ase = (ase_t*)CUTE_ASEPRITE_ALLOC(sizeof(ase_t), mem_ctx);
CUTE_ASEPRITE_MEMSET(ase, 0, sizeof(*ase));
ase_state_t state = { 0 };
ase_state_t* s = &state;
s->in = (uint8_t*)memory;
s->end = s->in + size;
s->mem_ctx = mem_ctx;
s_skip(s, sizeof(uint32_t)); // File size.
int magic = (int)s_read_uint16(s);
CUTE_ASEPRITE_ASSERT(magic == 0xA5E0);
ase->frame_count = (int)s_read_uint16(s);
ase->w = s_read_uint16(s);
ase->h = s_read_uint16(s);
uint16_t bpp = s_read_uint16(s) / 8;
if (bpp == 4) ase->mode = ASE_MODE_RGBA;
else if (bpp == 2) ase->mode = ASE_MODE_GRAYSCALE;
else {
CUTE_ASEPRITE_ASSERT(bpp == 1);
ase->mode = ASE_MODE_INDEXED;
}
uint32_t valid_layer_opacity = s_read_uint32(s) & 1;
int speed = s_read_uint16(s);
s_skip(s, sizeof(uint32_t) * 2); // Spec says skip these bytes, as they're zero'd.
ase->transparent_palette_entry_index = s_read_uint8(s);
s_skip(s, 3); // Spec says skip these bytes.
ase->number_of_colors = (int)s_read_uint16(s);
ase->pixel_w = (int)s_read_uint8(s);
ase->pixel_h = (int)s_read_uint8(s);
ase->grid_x = (int)s_read_int16(s);
ase->grid_y = (int)s_read_int16(s);
ase->grid_w = (int)s_read_uint16(s);
ase->grid_h = (int)s_read_uint16(s);
s_skip(s, 84); // For future use (set to zero).
ase->frames = (ase_frame_t*)CUTE_ASEPRITE_ALLOC((int)(sizeof(ase_frame_t)) * ase->frame_count, mem_ctx);
CUTE_ASEPRITE_MEMSET(ase->frames, 0, sizeof(ase_frame_t) * (size_t)ase->frame_count);
ase_udata_t* last_udata = NULL;
int was_on_tags = 0;
int tag_index = 0;
ase_layer_t* layer_stack[CUTE_ASEPRITE_MAX_LAYERS];
// Parse all chunks in the .aseprite file.
for (int i = 0; i < ase->frame_count; ++i) {
ase_frame_t* frame = ase->frames + i;
frame->ase = ase;
s_skip(s, sizeof(uint32_t)); // Frame size.
magic = (int)s_read_uint16(s);
CUTE_ASEPRITE_ASSERT(magic == 0xF1FA);
int chunk_count = (int)s_read_uint16(s);
frame->duration_milliseconds = s_read_uint16(s);
if (frame->duration_milliseconds == 0) frame->duration_milliseconds = speed;
s_skip(s, 2); // For future use (set to zero).
uint32_t new_chunk_count = s_read_uint32(s);
if (new_chunk_count) chunk_count = (int)new_chunk_count;
for (int j = 0; j < chunk_count; ++j) {
uint32_t chunk_size = s_read_uint32(s);
uint16_t chunk_type = s_read_uint16(s);
chunk_size -= (uint32_t)(sizeof(uint32_t) + sizeof(uint16_t));
uint8_t* chunk_start = s->in;
switch (chunk_type) {
case 0x2004: // Layer chunk.
{
CUTE_ASEPRITE_ASSERT(ase->layer_count < CUTE_ASEPRITE_MAX_LAYERS);
ase_layer_t* layer = ase->layers + ase->layer_count++;
layer->flags = (ase_layer_flags_t)s_read_uint16(s);
layer->type = (ase_layer_type_t)s_read_uint16(s);
layer->parent = NULL;
int child_level = (int)s_read_uint16(s);
layer_stack[child_level] = layer;
if (child_level) {
layer->parent = layer_stack[child_level - 1];
}
s_skip(s, sizeof(uint16_t)); // Default layer width in pixels (ignored).
s_skip(s, sizeof(uint16_t)); // Default layer height in pixels (ignored).
int blend_mode = (int)s_read_uint16(s);
if (blend_mode) CUTE_ASEPRITE_WARNING("Unknown blend mode encountered.");
layer->opacity = s_read_uint8(s) / 255.0f;
if (!valid_layer_opacity) layer->opacity = 1.0f;
s_skip(s, 3); // For future use (set to zero).
layer->name = s_read_string(s);
last_udata = &layer->udata;
} break;
case 0x2005: // Cel chunk.
{
CUTE_ASEPRITE_ASSERT(frame->cel_count < CUTE_ASEPRITE_MAX_LAYERS);
ase_cel_t* cel = frame->cels + frame->cel_count++;
int layer_index = (int)s_read_uint16(s);
cel->layer = ase->layers + layer_index;
cel->x = s_read_int16(s);
cel->y = s_read_int16(s);
cel->opacity = s_read_uint8(s) / 255.0f;
int cel_type = (int)s_read_uint16(s);
s_skip(s, 7); // For future (set to zero).
switch (cel_type) {