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fromsixel.c
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fromsixel.c
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/*
* This file is derived from "sixel" original version (2014-3-2)
* http://nanno.dip.jp/softlib/man/rlogin/sixel.tar.gz
*
* Initial developer of this file is kmiya@culti.
*
* He distributes it under very permissive license which permits
* useing, copying, modification, redistribution, and all other
* public activities without any restrictions.
*
* He declares this is compatible with MIT/BSD/GPL.
*
* Hayaki Saito <saitoha@me.com> modified this and re-licensed
* it under the MIT license.
*
* The helper function hls_to_rgb is imported from Xterm pl#310.
* This is originally written by Ross Combs.
* Hayaki Saito <saitoha@me.com> slightly modified this.
*
* -------------------------------------------------------------------------
* Copyright 2013,2014 by Ross Combs
*
* All Rights Reserved
*
* 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 ABOVE LISTED COPYRIGHT HOLDER(S) 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.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
* -------------------------------------------------------------------------
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h> /* isdigit */
#include <string.h> /* memcpy */
#include <limits.h>
#if defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#endif
#include <sixel.h>
#include "output.h"
#define SIXEL_RGB(r, g, b) (((r) << 16) + ((g) << 8) + (b))
#define PALVAL(n,a,m) (((n) * (a) + ((m) / 2)) / (m))
#define SIXEL_XRGB(r,g,b) SIXEL_RGB(PALVAL(r, 255, 100), PALVAL(g, 255, 100), PALVAL(b, 255, 100))
#define DECSIXEL_PARAMS_MAX 16
static int const sixel_default_color_table[] = {
SIXEL_XRGB(0, 0, 0), /* 0 Black */
SIXEL_XRGB(20, 20, 80), /* 1 Blue */
SIXEL_XRGB(80, 13, 13), /* 2 Red */
SIXEL_XRGB(20, 80, 20), /* 3 Green */
SIXEL_XRGB(80, 20, 80), /* 4 Magenta */
SIXEL_XRGB(20, 80, 80), /* 5 Cyan */
SIXEL_XRGB(80, 80, 20), /* 6 Yellow */
SIXEL_XRGB(53, 53, 53), /* 7 Gray 50% */
SIXEL_XRGB(26, 26, 26), /* 8 Gray 25% */
SIXEL_XRGB(33, 33, 60), /* 9 Blue* */
SIXEL_XRGB(60, 26, 26), /* 10 Red* */
SIXEL_XRGB(33, 60, 33), /* 11 Green* */
SIXEL_XRGB(60, 33, 60), /* 12 Magenta* */
SIXEL_XRGB(33, 60, 60), /* 13 Cyan* */
SIXEL_XRGB(60, 60, 33), /* 14 Yellow* */
SIXEL_XRGB(80, 80, 80), /* 15 Gray 75% */
};
typedef struct image_buffer {
unsigned char *data;
int width;
int height;
int palette[SIXEL_PALETTE_MAX];
int ncolors;
} image_buffer_t;
typedef enum parse_state {
PS_GROUND = 0,
PS_ESC = 1, /* ESC */
PS_DCS = 2, /* DCS Device Control String Introducer \033P P...P I...I F */
PS_DECSIXEL = 3, /* DECSIXEL body part ", $, -, ? ... ~ */
PS_DECGRA = 4, /* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
PS_DECGRI = 5, /* DECGRI Graphics Repeat Introducer ! Pn Ch */
PS_DECGCI = 6 /* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
} parse_state_t;
typedef struct parser_context {
parse_state_t state;
int pos_x;
int pos_y;
int max_x;
int max_y;
int attributed_pan;
int attributed_pad;
int attributed_ph;
int attributed_pv;
int repeat_count;
int color_index;
int bgindex;
int param;
int nparams;
int params[DECSIXEL_PARAMS_MAX];
} parser_context_t;
/*
* Primary color hues:
* blue: 0 degrees
* red: 120 degrees
* green: 240 degrees
*/
static int
hls_to_rgb(int hue, int lum, int sat)
{
double hs = (hue + 240) % 360;
double hv = hs / 360.0;
double lv = lum / 100.0;
double sv = sat / 100.0;
double c, x, m, c2;
double r1, g1, b1;
int r, g, b;
int hpi;
if (sat == 0) {
r = g = b = lum * 255 / 100;
return SIXEL_RGB(r, g, b);
}
if ((c2 = ((2.0 * lv) - 1.0)) < 0.0) {
c2 = -c2;
}
c = (1.0 - c2) * sv;
hpi = (int) (hv * 6.0);
x = c * (((hpi & 1) << 1) - 1) * ((hpi + (hpi & 1)) - hs / 60.0);
m = lv - 0.5 * c;
switch (hpi) {
case 0:
r1 = c;
g1 = x;
b1 = 0.0;
break;
case 1:
r1 = x;
g1 = c;
b1 = 0.0;
break;
case 2:
r1 = 0.0;
g1 = c;
b1 = x;
break;
case 3:
r1 = 0.0;
g1 = x;
b1 = c;
break;
case 4:
r1 = x;
g1 = 0.0;
b1 = c;
break;
case 5:
r1 = c;
g1 = 0.0;
b1 = x;
break;
default:
return SIXEL_RGB(255, 255, 255);
}
r = (int) ((r1 + m) * 100.0 + 0.5);
g = (int) ((g1 + m) * 100.0 + 0.5);
b = (int) ((b1 + m) * 100.0 + 0.5);
if (r < 0) {
r = 0;
} else if (r > 100) {
r = 100;
}
if (g < 0) {
g = 0;
} else if (g > 100) {
g = 100;
}
if (b < 0) {
b = 0;
} else if (b > 100) {
b = 100;
}
return SIXEL_RGB(r * 255 / 100, g * 255 / 100, b * 255 / 100);
}
static SIXELSTATUS
image_buffer_init(
image_buffer_t *image,
int width,
int height,
int bgindex,
sixel_allocator_t *allocator)
{
SIXELSTATUS status = SIXEL_FALSE;
size_t size;
int i;
int n;
int r;
int g;
int b;
/* check parameters */
if (width <= 0) {
sixel_helper_set_additional_message(
"image_buffer_init: an invalid width parameter detected.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (height <= 0) {
sixel_helper_set_additional_message(
"image_buffer_init: an invalid width parameter detected.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (height > SIXEL_HEIGHT_LIMIT) {
sixel_helper_set_additional_message(
"image_buffer_init: given height parameter is too huge.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (width > SIXEL_WIDTH_LIMIT) {
sixel_helper_set_additional_message(
"image_buffer_init: given width parameter is too huge.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (height > SIXEL_HEIGHT_LIMIT) {
sixel_helper_set_additional_message(
"image_buffer_init: given height parameter is too huge.");
status = SIXEL_BAD_INPUT;
goto end;
}
size = (size_t)(width) * (size_t)height * sizeof(unsigned char);
image->width = width;
image->height = height;
image->data = (unsigned char *)sixel_allocator_malloc(allocator, size);
image->ncolors = 2;
if (image->data == NULL) {
sixel_helper_set_additional_message(
"sixel_deocde_raw: sixel_allocator_malloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
memset(image->data, bgindex, size);
/* palette initialization */
for (n = 0; n < 16; n++) {
image->palette[n] = sixel_default_color_table[n];
}
/* colors 16-231 are a 6x6x6 color cube */
for (r = 0; r < 6; r++) {
for (g = 0; g < 6; g++) {
for (b = 0; b < 6; b++) {
image->palette[n++] = SIXEL_RGB(r * 51, g * 51, b * 51);
}
}
}
/* colors 232-255 are a grayscale ramp, intentionally leaving out */
for (i = 0; i < 24; i++) {
image->palette[n++] = SIXEL_RGB(i * 11, i * 11, i * 11);
}
for (; n < SIXEL_PALETTE_MAX; n++) {
image->palette[n] = SIXEL_RGB(255, 255, 255);
}
status = SIXEL_OK;
end:
return status;
}
static SIXELSTATUS
image_buffer_resize(
image_buffer_t *image,
int width,
int height,
int bgindex,
sixel_allocator_t *allocator)
{
SIXELSTATUS status = SIXEL_FALSE;
size_t size;
unsigned char *alt_buffer;
int n;
int min_height;
/* check parameters */
if (width <= 0) {
sixel_helper_set_additional_message(
"image_buffer_init: an invalid width parameter detected.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (height <= 0) {
sixel_helper_set_additional_message(
"image_buffer_init: an invalid width parameter detected.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (height > SIXEL_HEIGHT_LIMIT) {
sixel_helper_set_additional_message(
"image_buffer_init: given height parameter is too huge.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (width > SIXEL_WIDTH_LIMIT) {
sixel_helper_set_additional_message(
"image_buffer_init: given width parameter is too huge.");
status = SIXEL_BAD_INPUT;
goto end;
}
if (height > SIXEL_HEIGHT_LIMIT) {
sixel_helper_set_additional_message(
"image_buffer_init: given height parameter is too huge.");
status = SIXEL_BAD_INPUT;
goto end;
}
size = (size_t)width * (size_t)height;
alt_buffer = (unsigned char *)sixel_allocator_malloc(allocator, size);
if (alt_buffer == NULL || size == 0) {
/* free source image */
sixel_allocator_free(allocator, image->data);
image->data = NULL;
sixel_helper_set_additional_message(
"image_buffer_resize: sixel_allocator_malloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
min_height = height > image->height ? image->height: height;
if (width > image->width) { /* if width is extended */
for (n = 0; n < min_height; ++n) {
/* copy from source image */
memcpy(alt_buffer + (size_t)width * (size_t)n,
image->data + (size_t)image->width * (size_t)n,
(size_t)image->width);
/* fill extended area with background color */
memset(alt_buffer + (size_t)width * (size_t)n + (size_t)image->width,
bgindex,
(size_t)(width - image->width));
}
} else {
for (n = 0; n < min_height; ++n) {
/* copy from source image */
memcpy(alt_buffer + (size_t)width * (size_t)n,
image->data + (size_t)image->width * (size_t)n,
(size_t)width);
}
}
if (height > image->height) { /* if height is extended */
/* fill extended area with background color */
memset(alt_buffer + (size_t)width * (size_t)image->height,
bgindex,
(size_t)width * (size_t)(height - image->height));
}
/* free source image */
sixel_allocator_free(allocator, image->data);
image->data = alt_buffer;
image->width = width;
image->height = height;
status = SIXEL_OK;
end:
return status;
}
static SIXELSTATUS
parser_context_init(parser_context_t *context)
{
SIXELSTATUS status = SIXEL_FALSE;
context->state = PS_GROUND;
context->pos_x = 0;
context->pos_y = 0;
context->max_x = 0;
context->max_y = 0;
context->attributed_pan = 2;
context->attributed_pad = 1;
context->attributed_ph = 0;
context->attributed_pv = 0;
context->repeat_count = 1;
context->color_index = 15;
context->bgindex = (-1);
context->nparams = 0;
context->param = 0;
status = SIXEL_OK;
return status;
}
static SIXELSTATUS
safe_addition_for_params(parser_context_t *context, unsigned char *p)
{
SIXELSTATUS status = SIXEL_FALSE;
int x;
x = *p - '0'; /* 0 <= x <= 9 */
if ((context->param > INT_MAX / 10) || (x > INT_MAX - context->param * 10)) {
status = SIXEL_BAD_INTEGER_OVERFLOW;
sixel_helper_set_additional_message(
"safe_addition_for_params: ingeger overflow detected.");
goto end;
}
context->param = context->param * 10 + x;
status = SIXEL_OK;
end:
return status;
}
/* convert sixel data into indexed pixel bytes and palette data */
SIXELAPI SIXELSTATUS
sixel_decode_raw_impl(
unsigned char *p, /* sixel bytes */
int len, /* size of sixel bytes */
image_buffer_t *image,
parser_context_t *context,
sixel_allocator_t *allocator) /* allocator object */
{
SIXELSTATUS status = SIXEL_FALSE;
int n;
int i;
int y;
int bits;
int sixel_vertical_mask;
int sx;
int sy;
int c;
size_t pos;
unsigned char *p0 = p;
while (p < p0 + len) {
switch (context->state) {
case PS_GROUND:
switch (*p) {
case 0x1b:
context->state = PS_ESC;
p++;
break;
case 0x90:
context->state = PS_DCS;
p++;
break;
case 0x9c:
p++;
goto finalize;
default:
p++;
break;
}
break;
case PS_ESC:
switch (*p) {
case '\\':
case 0x9c:
p++;
goto finalize;
case 'P':
context->param = -1;
context->state = PS_DCS;
p++;
break;
default:
p++;
break;
}
break;
case PS_DCS:
switch (*p) {
case 0x1b:
context->state = PS_ESC;
p++;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (context->param < 0) {
context->param = 0;
}
status = safe_addition_for_params(context, p);
if (SIXEL_FAILED(status)) {
goto end;
}
p++;
break;
case ';':
if (context->param < 0) {
context->param = 0;
}
if (context->nparams < DECSIXEL_PARAMS_MAX) {
context->params[context->nparams++] = context->param;
}
context->param = 0;
p++;
break;
case 'q':
if (context->param >= 0 && context->nparams < DECSIXEL_PARAMS_MAX) {
context->params[context->nparams++] = context->param;
}
if (context->nparams > 0) {
/* Pn1 */
switch (context->params[0]) {
case 0:
case 1:
context->attributed_pad = 2;
break;
case 2:
context->attributed_pad = 5;
break;
case 3:
case 4:
context->attributed_pad = 4;
break;
case 5:
case 6:
context->attributed_pad = 3;
break;
case 7:
case 8:
context->attributed_pad = 2;
break;
case 9:
context->attributed_pad = 1;
break;
default:
context->attributed_pad = 2;
break;
}
}
if (context->nparams > 2) {
/* Pn3 */
if (context->params[2] == 0) {
context->params[2] = 10;
}
context->attributed_pan = context->attributed_pan * context->params[2] / 10;
context->attributed_pad = context->attributed_pad * context->params[2] / 10;
if (context->attributed_pan <= 0) {
context->attributed_pan = 1;
}
if (context->attributed_pad <= 0) {
context->attributed_pad = 1;
}
}
context->nparams = 0;
context->state = PS_DECSIXEL;
p++;
break;
default:
p++;
break;
}
break;
case PS_DECSIXEL:
switch (*p) {
case '\x1b':
context->state = PS_ESC;
p++;
break;
case '"':
context->param = 0;
context->nparams = 0;
context->state = PS_DECGRA;
p++;
break;
case '!':
context->param = 0;
context->nparams = 0;
context->state = PS_DECGRI;
p++;
break;
case '#':
context->param = 0;
context->nparams = 0;
context->state = PS_DECGCI;
p++;
break;
case '$':
/* DECGCR Graphics Carriage Return */
context->pos_x = 0;
p++;
break;
case '-':
/* DECGNL Graphics Next Line */
context->pos_x = 0;
context->pos_y += 6;
p++;
break;
default:
if (*p >= '?' && *p <= '~') { /* sixel characters */
if (image->width < (context->pos_x + context->repeat_count) || image->height < (context->pos_y + 6)) {
sx = image->width * 2;
sy = image->height * 2;
while (sx < (context->pos_x + context->repeat_count) || sy < (context->pos_y + 6)) {
sx *= 2;
sy *= 2;
}
status = image_buffer_resize(image, sx, sy, context->bgindex, allocator);
if (SIXEL_FAILED(status)) {
goto end;
}
}
if (context->color_index > image->ncolors) {
image->ncolors = context->color_index;
}
if (context->pos_x < 0 || context->pos_y < 0) {
status = SIXEL_BAD_INPUT;
goto end;
}
bits = *p - '?';
if (bits == 0) {
context->pos_x += context->repeat_count;
} else {
sixel_vertical_mask = 0x01;
if (context->repeat_count <= 1) {
for (i = 0; i < 6; i++) {
if ((bits & sixel_vertical_mask) != 0) {
pos = (size_t)image->width * (size_t)(context->pos_y + i) + (size_t)context->pos_x;
image->data[pos] = context->color_index;
if (context->max_x < context->pos_x) {
context->max_x = context->pos_x;
}
if (context->max_y < (context->pos_y + i)) {
context->max_y = context->pos_y + i;
}
}
sixel_vertical_mask <<= 1;
}
context->pos_x += 1;
} else {
/* context->repeat_count > 1 */
for (i = 0; i < 6; i++) {
if ((bits & sixel_vertical_mask) != 0) {
c = sixel_vertical_mask << 1;
for (n = 1; (i + n) < 6; n++) {
if ((bits & c) == 0) {
break;
}
c <<= 1;
}
for (y = context->pos_y + i; y < context->pos_y + i + n; ++y) {
memset(image->data + (size_t)image->width * (size_t)y + (size_t)context->pos_x,
context->color_index,
(size_t)context->repeat_count);
}
if (context->max_x < (context->pos_x + context->repeat_count - 1)) {
context->max_x = context->pos_x + context->repeat_count - 1;
}
if (context->max_y < (context->pos_y + i + n - 1)) {
context->max_y = context->pos_y + i + n - 1;
}
i += (n - 1);
sixel_vertical_mask <<= (n - 1);
}
sixel_vertical_mask <<= 1;
}
context->pos_x += context->repeat_count;
}
}
context->repeat_count = 1;
}
p++;
break;
}
break;
case PS_DECGRA:
/* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
switch (*p) {
case '\x1b':
context->state = PS_ESC;
p++;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
status = safe_addition_for_params(context, p);
if (SIXEL_FAILED(status)) {
goto end;
}
p++;
break;
case ';':
if (context->nparams < DECSIXEL_PARAMS_MAX) {
context->params[context->nparams++] = context->param;
}
context->param = 0;
p++;
break;
default:
if (context->nparams < DECSIXEL_PARAMS_MAX) {
context->params[context->nparams++] = context->param;
}
if (context->nparams > 0) {
context->attributed_pad = context->params[0];
}
if (context->nparams > 1) {
context->attributed_pan = context->params[1];
}
if (context->nparams > 2 && context->params[2] > 0) {
context->attributed_ph = context->params[2];
}
if (context->nparams > 3 && context->params[3] > 0) {
context->attributed_pv = context->params[3];
}
if (context->attributed_pan <= 0) {
context->attributed_pan = 1;
}
if (context->attributed_pad <= 0) {
context->attributed_pad = 1;
}
if (image->width < context->attributed_ph ||
image->height < context->attributed_pv) {
sx = context->attributed_ph;
if (image->width > context->attributed_ph) {
sx = image->width;
}
sy = context->attributed_pv;
if (image->height > context->attributed_pv) {
sy = image->height;
}
status = image_buffer_resize(image, sx, sy, context->bgindex, allocator);
if (SIXEL_FAILED(status)) {
goto end;
}
}
context->state = PS_DECSIXEL;
context->param = 0;
context->nparams = 0;
}
break;
case PS_DECGRI:
/* DECGRI Graphics Repeat Introducer ! Pn Ch */
switch (*p) {
case '\x1b':
context->state = PS_ESC;
p++;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
status = safe_addition_for_params(context, p);
if (SIXEL_FAILED(status)) {
goto end;
}
p++;
break;
default:
context->repeat_count = context->param;
if (context->repeat_count == 0) {
context->repeat_count = 1;
}
if (context->repeat_count > 0xffff) { /* check too huge number */
status = SIXEL_BAD_INPUT;
sixel_helper_set_additional_message(
"sixel_decode_raw_impl: detected too huge repeat parameter.");
goto end;
}
context->state = PS_DECSIXEL;
context->param = 0;
context->nparams = 0;
break;
}
break;
case PS_DECGCI:
/* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
switch (*p) {
case '\x1b':
context->state = PS_ESC;
p++;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
status = safe_addition_for_params(context, p);
if (SIXEL_FAILED(status)) {
goto end;
}
p++;
break;
case ';':
if (context->nparams < DECSIXEL_PARAMS_MAX) {
context->params[context->nparams++] = context->param;
}
context->param = 0;
p++;
break;
default:
context->state = PS_DECSIXEL;
if (context->nparams < DECSIXEL_PARAMS_MAX) {
context->params[context->nparams++] = context->param;
}
context->param = 0;
if (context->nparams > 0) {
context->color_index = context->params[0];
if (context->color_index < 0) {
context->color_index = 0;
} else if (context->color_index >= SIXEL_PALETTE_MAX) {
context->color_index = SIXEL_PALETTE_MAX - 1;
}
}
if (context->nparams > 4) {
if (context->params[1] == 1) {
/* HLS */
if (context->params[2] > 360) {
context->params[2] = 360;
}
if (context->params[3] > 100) {
context->params[3] = 100;
}
if (context->params[4] > 100) {
context->params[4] = 100;
}
image->palette[context->color_index]
= hls_to_rgb(context->params[2], context->params[3], context->params[4]);
} else if (context->params[1] == 2) {
/* RGB */
if (context->params[2] > 100) {
context->params[2] = 100;
}
if (context->params[3] > 100) {
context->params[3] = 100;
}
if (context->params[4] > 100) {
context->params[4] = 100;
}
image->palette[context->color_index]
= SIXEL_XRGB(context->params[2], context->params[3], context->params[4]);
}
}
break;
}
break;
default:
break;
}
}
finalize:
if (++context->max_x < context->attributed_ph) {
context->max_x = context->attributed_ph;
}
if (++context->max_y < context->attributed_pv) {
context->max_y = context->attributed_pv;
}
if (image->width > context->max_x || image->height > context->max_y) {
status = image_buffer_resize(image, context->max_x, context->max_y, context->bgindex, allocator);
if (SIXEL_FAILED(status)) {
goto end;
}
}
status = SIXEL_OK;
end:
return status;
}
/* convert sixel data into indexed pixel bytes and palette data */
SIXELAPI SIXELSTATUS
sixel_decode_raw(
unsigned char /* in */ *p, /* sixel bytes */
int /* in */ len, /* size of sixel bytes */
unsigned char /* out */ **pixels, /* decoded pixels */
int /* out */ *pwidth, /* image width */
int /* out */ *pheight, /* image height */
unsigned char /* out */ **palette, /* ARGB palette */
int /* out */ *ncolors, /* palette size (<= 256) */
sixel_allocator_t /* in */ *allocator) /* allocator object or null */
{
SIXELSTATUS status = SIXEL_FALSE;
parser_context_t context;
image_buffer_t image;
int n;
if (allocator) {
sixel_allocator_ref(allocator);
} else {
status = sixel_allocator_new(&allocator, NULL, NULL, NULL, NULL);
if (SIXEL_FAILED(status)) {
allocator = NULL;
goto end;
}
}
/* parser context initialization */
status = parser_context_init(&context);
if (SIXEL_FAILED(status)) {
goto end;
}
/* buffer initialization */
status = image_buffer_init(&image, 1, 1, context.bgindex, allocator);
if (SIXEL_FAILED(status)) {
goto end;
}
status = sixel_decode_raw_impl(p, len, &image, &context, allocator);
if (SIXEL_FAILED(status)) {
goto end;
}
*ncolors = image.ncolors + 1;
int alloc_size = *ncolors;
if (alloc_size < SIXEL_PALETTE_MAX) {
/* memory access range should be 0 <= 255 */
alloc_size = SIXEL_PALETTE_MAX;
}
*palette = (unsigned char *)sixel_allocator_malloc(allocator, (size_t)(alloc_size * 3));