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ETC Native Decoding Support

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This commit is contained in:
Ishotihadus
2018-05-27 17:17:37 +09:00
parent ac7b0a2806
commit 6a0cc560f5
5 changed files with 342 additions and 195 deletions
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README.md
+1 -1
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@@ -108,7 +108,7 @@ obj.key
You can get image data directly from Texture2D object. Output object's class is `ChunkyPNG::Image`.
Some basic texture formats (1–5, 7, 9, 13–20, 22, 62, and 63), DXT1 (10), DXT5 (12), ETC_RGB4 (34), ETC2 (45, 47), and ASTC (48–59) are available.
Some basic texture formats (1–5, 7, 9, 13–20, 22, 62, and 63), DXT1 (10), DXT5 (12), ETC_RGB4 (34), ETC2 (45–47), and ASTC (48–59) are available.
```ruby
require 'mikunyan/decoders'
ext/decoders/native/etc.c
+271
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@@ -0,0 +1,271 @@
#include <stdint.h>
#include <string.h>
#include "etc.h"
uint_fast8_t WriteOrderTable[16] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 };
uint_fast8_t WriteOrderTableRev[16] = { 15, 11, 7, 3, 14, 10, 6, 2, 13, 9, 5, 1, 12, 8, 4, 0 };
uint_fast8_t Etc1ModifierTable[8][2] = {{2, 8}, {5, 17}, {9, 29}, {13, 42}, {18, 60}, {24, 80}, {33, 106}, {47, 183}};
uint_fast8_t Etc1SubblockTable[2][16] = {{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1}, {0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1}};
uint_fast8_t Etc2DistanceTable[8] = {3, 6, 11, 16, 23, 32, 41, 64};
int_fast8_t Etc2AlphaModTable[16][8] = {
{-3, -6, -9, -15, 2, 5, 8, 14},
{-3, -7, -10, -13, 2, 6, 9, 12},
{-2, -5, -8, -13, 1, 4, 7, 12},
{-2, -4, -6, -13, 1, 3, 5, 12},
{-3, -6, -8, -12, 2, 5, 7, 11},
{-3, -7, -9, -11, 2, 6, 8, 10},
{-4, -7, -8, -11, 3, 6, 7, 10},
{-3, -5, -8, -11, 2, 4, 7, 10},
{-2, -6, -8, -10, 1, 5, 7, 9},
{-2, -5, -8, -10, 1, 4, 7, 9},
{-2, -4, -8, -10, 1, 3, 7, 9},
{-2, -5, -7, -10, 1, 4, 6, 9},
{-3, -4, -7, -10, 2, 3, 6, 9},
{-1, -2, -3, -10, 0, 1, 2, 9},
{-4, -6, -8, -9, 3, 5, 7, 8},
{-3, -5, -7, -9, 2, 4, 6, 8}
};
static inline uint_fast32_t color(uint_fast32_t r, uint_fast32_t g, uint_fast32_t b, uint_fast32_t a) {
return r | g << 8 | b << 16 | a << 24;
}
static inline uint_fast8_t clamp(const int n) {
return n < 0 ? 0 : n > 255 ? 255 : n;
}
static inline uint32_t applicate_color(uint_fast8_t c[3], int_fast16_t m) {
return color(clamp(c[0] + m), clamp(c[1] + m), clamp(c[2] + m), 255);
}
static inline uint32_t applicate_color_raw(uint_fast8_t c[3]) {
return color(c[0], c[1], c[2], 255);
}
static inline void decode_etc1_block(const uint8_t *data, uint32_t *outbuf) {
uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 };
uint_fast8_t *table = Etc1SubblockTable[data[3] & 1];
uint_fast8_t c[2][3];
if (data[3] & 2) {
c[0][0] = data[0] & 0xf8;
c[0][1] = data[1] & 0xf8;
c[0][2] = data[2] & 0xf8;
c[1][0] = c[0][0] + (data[0] << 3 & 0x18) - (data[0] << 3 & 0x20);
c[1][1] = c[0][1] + (data[1] << 3 & 0x18) - (data[1] << 3 & 0x20);
c[1][2] = c[0][2] + (data[2] << 3 & 0x18) - (data[2] << 3 & 0x20);
c[0][0] |= c[0][0] >> 5;
c[0][1] |= c[0][1] >> 5;
c[0][2] |= c[0][2] >> 5;
c[1][0] |= c[1][0] >> 5;
c[1][1] |= c[1][1] >> 5;
c[1][2] |= c[1][2] >> 5;
} else {
c[0][0] = data[0] & 0xf0 | data[0] >> 4;
c[1][0] = data[0] & 0x0f | data[0] << 4;
c[0][1] = data[1] & 0xf0 | data[1] >> 4;
c[1][1] = data[1] & 0x0f | data[1] << 4;
c[0][2] = data[2] & 0xf0 | data[2] >> 4;
c[1][2] = data[2] & 0x0f | data[2] << 4;
}
uint_fast16_t j = data[6] << 8 | data[7];
uint_fast16_t k = data[4] << 8 | data[5];
for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
uint_fast8_t s = table[i];
uint_fast8_t m = Etc1ModifierTable[code[s]][j & 1];
outbuf[WriteOrderTable[i]] = applicate_color(c[s], k & 1 ? -m : m);
}
}
void decode_etc1(const void *data, const int w, const int h, uint32_t *image) {
int bcw = (w + 3) / 4;
int bch = (h + 3) / 4;
int clen_last = (w + 3) % 4 + 1;
uint32_t buf[16];
const uint8_t *d = (uint8_t*)data;
for (int t = 0; t < bch; t++) {
for (int s = 0; s < bcw; s++, d += 8) {
decode_etc1_block(d, buf);
int clen = (s < bcw - 1 ? 4 : clen_last) * 4;
for (int i = 0, y = h - t * 4 - 1; i < 4 && y >= 0; i++, y--)
memcpy(image + y * w + s * 4, buf + i * 4, clen);
}
}
}
static inline void decode_etc2_block(const uint8_t *data, uint32_t *outbuf) {
uint_fast16_t j = data[6] << 8 | data[7];
uint_fast16_t k = data[4] << 8 | data[5];
uint_fast8_t c[3][3] = {};
if (data[3] & 2) {
uint_fast8_t r = data[0] & 0xf8;
int_fast16_t dr = (data[0] << 3 & 0x18) - (data[0] << 3 & 0x20);
uint_fast8_t g = data[1] & 0xf8;
int_fast16_t dg = (data[1] << 3 & 0x18) - (data[1] << 3 & 0x20);
uint_fast8_t b = data[2] & 0xf8;
int_fast16_t db = (data[2] << 3 & 0x18) - (data[2] << 3 & 0x20);
if (r + dr < 0 || r + dr > 255) {
// T
c[0][0] = data[0] << 3 & 0xc0 | data[0] << 4 & 0x30 | data[0] >> 1 & 0xc | data[0] & 3;
c[0][1] = data[1] & 0xf0 | data[1] >> 4;
c[0][2] = data[1] & 0x0f | data[1] << 4;
c[1][0] = data[2] & 0xf0 | data[2] >> 4;
c[1][1] = data[2] & 0x0f | data[2] << 4;
c[1][2] = data[3] & 0xf0 | data[3] >> 4;
uint_fast8_t d = Etc2DistanceTable[data[3] >> 1 & 6 | data[3] & 1];
uint_fast32_t color_set[4] = {
applicate_color_raw(c[0]),
applicate_color(c[1], d),
applicate_color_raw(c[1]),
applicate_color(c[1], -d)
};
for (int i = 0; i < 16; i++, j >>= 1, k >>= 1)
outbuf[WriteOrderTable[i]] = color_set[k << 1 & 2 | j & 1];
} else if (g + dg < 0 || g + dg > 255) {
// H
c[0][0] = data[0] << 1 & 0xf0 | data[0] >> 3 & 0xf;
c[0][1] = data[0] << 5 & 0xe0 | data[1] & 0x10;
c[0][1] |= c[0][1] >> 4;
c[0][2] = data[1] & 8 | data[1] << 1 & 6 | data[2] >> 7;
c[0][2] |= c[0][2] << 4;
c[1][0] = data[2] << 1 & 0xf0 | data[2] >> 3 & 0xf;
c[1][1] = data[2] << 5 & 0xe0 | data[3] >> 3 & 0x10;
c[1][1] |= c[1][1] >> 4;
c[1][2] = data[3] << 1 & 0xf0 | data[3] >> 3 & 0xf;
uint_fast8_t d = data[3] & 4 | data[3] << 1 & 2;
if (c[0][0] > c[1][0] || (c[0][0] == c[1][0] && (c[0][1] > c[1][1] || (c[0][1] == c[1][1] && c[0][2] >= c[1][2]))))
++d;
d = Etc2DistanceTable[d];
uint_fast32_t color_set[4] = {
applicate_color(c[0], d),
applicate_color(c[0], -d),
applicate_color(c[1], d),
applicate_color(c[1], -d)
};
for (int i = 0; i < 16; i++, j >>= 1, k >>= 1)
outbuf[WriteOrderTable[i]] = color_set[k << 1 & 2 | j & 1];
} else if (b + db < 0 || b + db > 255) {
// planar
c[0][0] = data[0] << 1 & 0xfc | data[0] >> 5 & 3;
c[0][1] = data[0] << 7 & 0x80 | data[1] & 0x7e | data[0] & 1;
c[0][2] = data[1] << 7 & 0x80 | data[2] << 2 & 0x60 | data[2] << 3 & 0x18 | data[3] >> 5 & 4;
c[0][2] |= c[0][2] >> 6;
c[1][0] = data[3] << 1 & 0xf8 | data[3] << 2 & 4 | data[3] >> 5 & 3;
c[1][1] = data[4] & 0xfe | data[4] >> 7;
c[1][2] = data[4] << 7 & 0x80 | data[5] >> 1 & 0x7c;
c[1][2] |= c[1][2] >> 6;
c[2][0] = data[5] << 5 & 0xe0 | data[6] >> 3 & 0x1c | data[5] >> 1 & 3;
c[2][1] = data[6] << 3 & 0xf8 | data[7] >> 5 & 0x6 | data[6] >> 4 & 1;
c[2][2] = data[7] << 2 | data[7] >> 4 & 3;
for (int x = 3, i = 0; x >= 0; x--) {
for (int y = 3; y >= 0; y--, i++) {
uint8_t r = clamp((x * (c[1][0] - c[0][0]) + y * (c[2][0] - c[0][0]) + 4 * c[0][0] + 2) >> 2);
uint8_t g = clamp((x * (c[1][1] - c[0][1]) + y * (c[2][1] - c[0][1]) + 4 * c[0][1] + 2) >> 2);
uint8_t b = clamp((x * (c[1][2] - c[0][2]) + y * (c[2][2] - c[0][2]) + 4 * c[0][2] + 2) >> 2);
outbuf[i] = color(r, g, b, 255);
}
}
} else {
// differential
uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 };
uint_fast8_t *table = Etc1SubblockTable[data[3] & 1];
c[0][0] = r | r >> 5;
c[0][1] = g | g >> 5;
c[0][2] = b | b >> 5;
c[1][0] = r + dr;
c[1][1] = g + dg;
c[1][2] = b + db;
c[1][0] |= c[1][0] >> 5;
c[1][1] |= c[1][1] >> 5;
c[1][2] |= c[1][2] >> 5;
for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
uint_fast8_t s = table[i];
uint_fast8_t m = Etc1ModifierTable[code[s]][j & 1];
outbuf[WriteOrderTable[i]] = applicate_color(c[s], k & 1 ? -m : m);
}
}
} else {
// individual
uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 };
uint_fast8_t *table = Etc1SubblockTable[data[3] & 1];
c[0][0] = data[0] & 0xf0 | data[0] >> 4;
c[1][0] = data[0] & 0x0f | data[0] << 4;
c[0][1] = data[1] & 0xf0 | data[1] >> 4;
c[1][1] = data[1] & 0x0f | data[1] << 4;
c[0][2] = data[2] & 0xf0 | data[2] >> 4;
c[1][2] = data[2] & 0x0f | data[2] << 4;
for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
uint_fast8_t s = table[i];
uint_fast8_t m = Etc1ModifierTable[code[s]][j & 1];
outbuf[WriteOrderTable[i]] = applicate_color(c[s], k & 1 ? -m : m);
}
}
}
static inline void decode_etc2a8_block(const uint8_t *data, uint32_t *outbuf) {
if (data[2] & 0xf0) {
uint_fast8_t mult = data[1] >> 4;
int_fast8_t *table = Etc2AlphaModTable[data[1] & 0xf];
uint_fast64_t l =
data[7] | (uint_fast16_t)data[6] << 8 |
(uint_fast32_t)data[5] << 16 | (uint_fast32_t)data[4] << 24 |
(uint_fast64_t)data[3] << 32 | (uint_fast64_t)data[2] << 40;
for (int i = 0; i < 16; i++, l >>= 3)
((uint8_t*)(outbuf + WriteOrderTableRev[i]))[3] = clamp(data[0] + mult * table[l & 7]);
} else {
for (int i = 0; i < 16; i++)
((uint8_t*)(outbuf + i))[3] = data[0];
}
}
void decode_etc2(const void *data, const int w, const int h, uint32_t *image) {
int bcw = (w + 3) / 4;
int bch = (h + 3) / 4;
int clen_last = (w + 3) % 4 + 1;
uint32_t buf[16];
const uint8_t *d = (uint8_t*)data;
for (int t = 0; t < bch; t++) {
for (int s = 0; s < bcw; s++, d += 8) {
decode_etc2_block(d, buf);
int clen = (s < bcw - 1 ? 4 : clen_last) * 4;
for (int i = 0, y = h - t * 4 - 1; i < 4 && y >= 0; i++, y--)
memcpy(image + y * w + s * 4, buf + i * 4, clen);
}
}
}
void decode_etc2a1(const void *data, const int w, const int h, uint32_t *image) {
int bcw = (w + 3) / 4;
int bch = (h + 3) / 4;
int clen_last = (w + 3) % 4 + 1;
uint32_t buf[16];
const uint8_t *d = (uint8_t*)data;
for (int t = 0; t < bch; t++) {
for (int s = 0; s < bcw; s++, d += 9) {
decode_etc2_block(d + 1, buf);
for (int i = 0; i < 16; i++)
((uint8_t*)(buf + i))[3] = d[0];
int clen = (s < bcw - 1 ? 4 : clen_last) * 4;
for (int i = 0, y = h - t * 4 - 1; i < 4 && y >= 0; i++, y--)
memcpy(image + y * w + s * 4, buf + i * 4, clen);
}
}
}
void decode_etc2a8(const void *data, const int w, const int h, uint32_t *image) {
int bcw = (w + 3) / 4;
int bch = (h + 3) / 4;
int clen_last = (w + 3) % 4 + 1;
uint32_t buf[16];
const uint8_t *d = (uint8_t*)data;
for (int t = 0; t < bch; t++) {
for (int s = 0; s < bcw; s++, d += 16) {
decode_etc2_block(d + 8, buf);
decode_etc2a8_block(d, buf);
int clen = (s < bcw - 1 ? 4 : clen_last) * 4;
for (int i = 0, y = h - t * 4 - 1; i < 4 && y >= 0; i++, y--)
memcpy(image + y * w + s * 4, buf + i * 4, clen);
}
}
}
ext/decoders/native/etc.h
+11
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@@ -0,0 +1,11 @@
#ifndef ETC_H
#define ETC_H
#include <stdint.h>
void decode_etc1(const void*, const int, const int, uint32_t*);
void decode_etc2(const void*, const int, const int, uint32_t*);
void decode_etc2a1(const void*, const int, const int, uint32_t*);
void decode_etc2a8(const void*, const int, const int, uint32_t*);
#endif /* end of include guard: ETC_H */
ext/decoders/native/main.c
+45
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@@ -2,6 +2,7 @@
#include <stdint.h>
#include <ruby.h>
#include "rgb.h"
#include "etc.h"
#include "astc.h"
#include "dxtc.h"
@@ -15,6 +16,46 @@ static VALUE rb_decode_rgb565(VALUE self, VALUE rb_data, VALUE size, VALUE big)
return ret;
}
static VALUE rb_decode_etc1(VALUE self, VALUE rb_data, VALUE w, VALUE h) {
if (RSTRING_LEN(rb_data) < ((FIX2LONG(w) + 3) / 4) * ((FIX2LONG(h) + 3) / 4) * 8)
rb_raise(rb_eStandardError, "Data size is not enough.");
uint32_t *image = (uint32_t*)calloc(FIX2LONG(w) * FIX2LONG(h), sizeof(uint32_t));
decode_etc1((uint64_t*)RSTRING_PTR(rb_data), FIX2INT(w), FIX2INT(h), image);
VALUE ret = rb_str_new((char*)image, FIX2LONG(w) * FIX2LONG(h) * sizeof(uint32_t));
free(image);
return ret;
}
static VALUE rb_decode_etc2(VALUE self, VALUE rb_data, VALUE w, VALUE h) {
if (RSTRING_LEN(rb_data) < ((FIX2LONG(w) + 3) / 4) * ((FIX2LONG(h) + 3) / 4) * 8)
rb_raise(rb_eStandardError, "Data size is not enough.");
uint32_t *image = (uint32_t*)calloc(FIX2LONG(w) * FIX2LONG(h), sizeof(uint32_t));
decode_etc2((uint64_t*)RSTRING_PTR(rb_data), FIX2INT(w), FIX2INT(h), image);
VALUE ret = rb_str_new((char*)image, FIX2LONG(w) * FIX2LONG(h) * sizeof(uint32_t));
free(image);
return ret;
}
static VALUE rb_decode_etc2a1(VALUE self, VALUE rb_data, VALUE w, VALUE h) {
if (RSTRING_LEN(rb_data) < ((FIX2LONG(w) + 3) / 4) * ((FIX2LONG(h) + 3) / 4) * 9)
rb_raise(rb_eStandardError, "Data size is not enough.");
uint32_t *image = (uint32_t*)calloc(FIX2LONG(w) * FIX2LONG(h), sizeof(uint32_t));
decode_etc2a8((uint64_t*)RSTRING_PTR(rb_data), FIX2INT(w), FIX2INT(h), image);
VALUE ret = rb_str_new((char*)image, FIX2LONG(w) * FIX2LONG(h) * sizeof(uint32_t));
free(image);
return ret;
}
static VALUE rb_decode_etc2a8(VALUE self, VALUE rb_data, VALUE w, VALUE h) {
if (RSTRING_LEN(rb_data) < ((FIX2LONG(w) + 3) / 4) * ((FIX2LONG(h) + 3) / 4) * 16)
rb_raise(rb_eStandardError, "Data size is not enough.");
uint32_t *image = (uint32_t*)calloc(FIX2LONG(w) * FIX2LONG(h), sizeof(uint32_t));
decode_etc2a8((uint64_t*)RSTRING_PTR(rb_data), FIX2INT(w), FIX2INT(h), image);
VALUE ret = rb_str_new((char*)image, FIX2LONG(w) * FIX2LONG(h) * sizeof(uint32_t));
free(image);
return ret;
}
static VALUE rb_decode_astc(VALUE self, VALUE rb_data, VALUE w, VALUE h, VALUE bw, VALUE bh) {
if (RSTRING_LEN(rb_data) < ((FIX2LONG(w) + FIX2LONG(bw) - 1) / FIX2LONG(bw)) * ((FIX2LONG(h) + FIX2LONG(bh) - 1) / FIX2LONG(bh)) * 16)
rb_raise(rb_eStandardError, "Data size is not enough.");
@@ -50,6 +91,10 @@ void Init_native() {
VALUE mMikunyan = rb_define_module("Mikunyan");
VALUE mDecodeHelper = rb_define_module_under(mMikunyan, "DecodeHelper");
rb_define_module_function(mDecodeHelper, "decode_rgb565", rb_decode_rgb565, 3);
rb_define_module_function(mDecodeHelper, "decode_etc1", rb_decode_etc1, 3);
rb_define_module_function(mDecodeHelper, "decode_etc2", rb_decode_etc2, 3);
rb_define_module_function(mDecodeHelper, "decode_etc2a1", rb_decode_etc2a1, 3);
rb_define_module_function(mDecodeHelper, "decode_etc2a8", rb_decode_etc2a8, 3);
rb_define_module_function(mDecodeHelper, "decode_astc", rb_decode_astc, 5);
rb_define_module_function(mDecodeHelper, "decode_dxt1", rb_decode_dxt1, 3);
rb_define_module_function(mDecodeHelper, "decode_dxt5", rb_decode_dxt5, 3);
lib/mikunyan/decoders/image_decoder.rb
+14 -194
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@@ -64,6 +64,8 @@ module Mikunyan
decode_etc1(width, height, bin)
when 45
decode_etc2rgb(width, height, bin)
when 46
decode_etc2rgba1(width, height, bin)
when 47
decode_etc2rgba8(width, height, bin)
when 48, 54
@@ -370,16 +372,7 @@ module Mikunyan
# @param [String] bin binary to decode
# @return [ChunkyPNG::Image] decoded image
def self.decode_etc1(width, height, bin)
bw = (width + 3) / 4
bh = (height + 3) / 4
ret = ChunkyPNG::Image.new(bh * 4, bw * 4)
bh.times do |by|
bw.times do |bx|
block = decode_etc1_block(BinUtils.get_sint64_be(bin, (bx + by * bw) * 8))
ret.replace!(ChunkyPNG::Image.from_rgb_stream(4, 4, block), by * 4, bx * 4)
end
end
ret.crop(0, 0, height, width).rotate_left
ChunkyPNG::Image.from_rgba_stream(width, height, DecodeHelper.decode_etc1(bin, width, height))
end
# Decode image from ETC2 compressed binary
@@ -388,16 +381,16 @@ module Mikunyan
# @param [String] bin binary to decode
# @return [ChunkyPNG::Image] decoded image
def self.decode_etc2rgb(width, height, bin)
bw = (width + 3) / 4
bh = (height + 3) / 4
ret = ChunkyPNG::Image.new(bh * 4, bw * 4)
bh.times do |by|
bw.times do |bx|
block = decode_etc2_block(BinUtils.get_sint64_be(bin, (bx + by * bw) * 8))
ret.replace!(ChunkyPNG::Image.from_rgb_stream(4, 4, block), by * 4, bx * 4)
end
end
ret.crop(0, 0, height, width).rotate_left
ChunkyPNG::Image.from_rgba_stream(width, height, DecodeHelper.decode_etc2(bin, width, height))
end
# Decode image from ETC2 Alpha1 compressed binary
# @param [Integer] width image width
# @param [Integer] height image height
# @param [String] bin binary to decode
# @return [ChunkyPNG::Image] decoded image
def self.decode_etc2rgba1(width, height, bin)
ChunkyPNG::Image.from_rgba_stream(width, height, DecodeHelper.decode_etc2a1(bin, width, height))
end
# Decode image from ETC2 Alpha8 compressed binary
@@ -406,19 +399,7 @@ module Mikunyan
# @param [String] bin binary to decode
# @return [ChunkyPNG::Image] decoded image
def self.decode_etc2rgba8(width, height, bin)
bw = (width + 3) / 4
bh = (height + 3) / 4
ret = ChunkyPNG::Image.new(bh * 4, bw * 4)
bh.times do |by|
bw.times do |bx|
alpha = decode_etc2alpha_block(BinUtils.get_int64_be(bin, (bx + by * bw) * 16))
block = decode_etc2_block(BinUtils.get_int64_be(bin, (bx + by * bw) * 16 + 8))
mem = String.new(capacity: 64)
16.times{|i| BinUtils.append_string!(mem, block[i * 3, 3] + alpha[15 - i])}
ret.replace!(ChunkyPNG::Image.from_rgba_stream(4, 4, mem), by * 4, bx * 4)
end
end
ret.crop(0, 0, height, width).rotate_left
ChunkyPNG::Image.from_rgba_stream(width, height, DecodeHelper.decode_etc2a8(bin, width, height))
end
# Decode image from ASTC compressed binary
@@ -461,167 +442,6 @@ module Mikunyan
private
Etc1ModifierTable = [[2, 8], [5, 17], [9, 29], [13, 42], [18, 60], [24, 80], [33, 106], [47, 183]]
Etc1SubblockTable = [[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1], [0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1]]
Etc2DistanceTable = [3, 6, 11, 16, 23, 32, 41, 64]
Etc2AlphaModTable = [
[-3, -6, -9, -15, 2, 5, 8, 14],
[-3, -7, -10, -13, 2, 6, 9, 12],
[-2, -5, -8, -13, 1, 4, 7, 12],
[-2, -4, -6, -13, 1, 3, 5, 12],
[-3, -6, -8, -12, 2, 5, 7, 11],
[-3, -7, -9, -11, 2, 6, 8, 10],
[-4, -7, -8, -11, 3, 6, 7, 10],
[-3, -5, -8, -11, 2, 4, 7, 10],
[-2, -6, -8, -10, 1, 5, 7, 9],
[-2, -5, -8, -10, 1, 4, 7, 9],
[-2, -4, -8, -10, 1, 3, 7, 9],
[-2, -5, -7, -10, 1, 4, 6, 9],
[-3, -4, -7, -10, 2, 3, 6, 9],
[-1, -2, -3, -10, 0, 1, 2, 9],
[-4, -6, -8, -9, 3, 5, 7, 8],
[-3, -5, -7, -9, 2, 4, 6, 8]
]
def self.decode_etc1_block(bin)
colors = []
codes = [bin >> 37 & 7, bin >> 34 & 7]
subblocks = Etc1SubblockTable[bin[32]]
if bin[33] == 0
colors[0] = bin >> 40 & 0xf0f0f0
colors[0] = colors[0] | colors[0] >> 4
colors[1] = bin >> 36 & 0xf0f0f0
colors[1] = colors[1] | colors[1] >> 4
else
colors[0] = bin >> 40 & 0xf8f8f8
dr = (bin >> 56 & 3) - (bin >> 56 & 4)
dg = (bin >> 48 & 3) - (bin >> 48 & 4)
db = (bin >> 40 & 3) - (bin >> 40 & 4)
colors[1] = colors[0] + (dr << 19) + (dg << 11) + (db << 3)
colors[0] = colors[0] | (colors[0] >> 5 & 0x70707)
colors[1] = colors[1] | (colors[1] >> 5 & 0x70707)
end
mem = String.new(capacity: 48)
16.times do |i|
modifier = Etc1ModifierTable[codes[subblocks[i]]][bin[i]]
etc1colormod_append(mem, colors[subblocks[i]], bin[i + 16] == 0 ? modifier : -modifier)
end
mem
end
def self.etc1colormod_append(str, color, modifier)
r = (color >> 16 & 0xff) + modifier
g = (color >> 8 & 0xff) + modifier
b = (color & 0xff) + modifier
BinUtils.append_int8!(str, r.clamp(0, 255), g.clamp(0, 255), b.clamp(0, 255))
end
def self.etc1colormod(color, modifier)
r = (color >> 16 & 0xff) + modifier
g = (color >> 8 & 0xff) + modifier
b = (color & 0xff) + modifier
r.clamp(0, 255).chr + g.clamp(0, 255).chr + b.clamp(0, 255).chr
end
def self.decode_etc2_block(bin)
mem = String.new(capacity: 48)
if bin[33] == 0
# individual
colors = [0, 0]
colors[0] = bin >> 40 & 0xf0f0f0
colors[0] = colors[0] | colors[0] >> 4
colors[1] = bin >> 36 & 0xf0f0f0
colors[1] = colors[1] | colors[1] >> 4
codes = [bin >> 37 & 7, bin >> 34 & 7]
subblocks = Etc1SubblockTable[bin[32]]
16.times do |i|
modifier = Etc1ModifierTable[codes[subblocks[i]]][bin[i]]
etc1colormod_append(mem, colors[subblocks[i]], bin[i + 16] == 0 ? modifier : -modifier)
end
else
r = bin >> 59
dr = (bin >> 56 & 3) - (bin >> 56 & 4)
g = bin >> 51 & 0x1f
dg = (bin >> 48 & 3) - (bin >> 48 & 4)
b = bin >> 43 & 0x1f
db = (bin >> 40 & 3) - (bin >> 40 & 4)
if r + dr < 0 || r + dr > 31
# T mode
base1 = (bin >> 49 & 0xc00) | (bin >> 48 & 0x3ff)
base1 = (base1 & 0xf00) << 8 | (base1 & 0xf0) << 4 | (base1 & 0xf)
base1 = (base1 << 4) | base1
base2 = bin >> 36 & 0xfff
base2 = (base2 & 0xf00) << 8 | (base2 & 0xf0) << 4 | (base2 & 0xf)
base2 = (base2 << 4) | base2
d = Etc2DistanceTable[(bin >> 33 & 6) + bin[32]]
colors = [[base1].pack('N')[1,3], etc1colormod(base2, d), [base2].pack('N')[1,3], etc1colormod(base2, -d)]
16.times do |i|
BinUtils.append_string!(mem, colors[bin[i] + bin[i + 16] * 2])
end
elsif g + dg < 0 || g + dg > 31
# H mode
base1 = (bin >> 51 & 0xfe0) | (bin >> 48 & 0x18) | (bin >> 47 & 7)
base1 = (base1 & 0xf00) << 8 | (base1 & 0xf0) << 4 | (base1 & 0xf)
base1 = (base1 << 4) | base1
base2 = bin >> 35 & 0xfff
base2 = (base2 & 0xf00) << 8 | (base2 & 0xf0) << 4 | (base2 & 0xf)
base2 = (base2 << 4) | base2
d = Etc2DistanceTable[bin[34] * 2 + bin[32]]
colors = [etc1colormod(base1, d), etc1colormod(base1, -d), etc1colormod(base2, d), etc1colormod(base2, -d)]
16.times do |i|
BinUtils.append_string!(mem, colors[bin[i] + bin[i + 16] * 2])
end
elsif b + db < 0 || b + db > 31
# planar mode
color_or = (bin >> 55 & 0xfc) | (bin >> 61 & 0x03)
color_og = (bin >> 49 & 0x80) | (bin >> 48 & 0x7e) | bin[56]
color_ob = (bin >> 41 & 0x80) | (bin >> 38 & 0x60) | (bin >> 37 & 0x1c) | (bin >> 47 & 2) | bin[44]
color_hr = (bin >> 31 & 0xf8) | (bin >> 30 & 0x04) | (bin >> 37 & 0x03)
color_hg = (bin >> 24 & 0xfe) | bin[31]
color_hb = (bin >> 17 & 0xfc) | (bin >> 23 & 0x03)
color_vr = (bin >> 11 & 0xfc) | (bin >> 17 & 0x03)
color_vg = (bin >> 5 & 0xfe) | bin[12]
color_vb = (bin << 2 & 0xfc) | (bin >> 4 & 0x03)
16.times do |i|
x = i / 4
y = i % 4
r = (x * (color_hr - color_or) + y * (color_vr - color_or) + 4 * color_or + 2) >> 2
g = (x * (color_hg - color_og) + y * (color_vg - color_og) + 4 * color_og + 2) >> 2
b = (x * (color_hb - color_ob) + y * (color_vb - color_ob) + 4 * color_ob + 2) >> 2
BinUtils.append_int8!(mem, r.clamp(0, 255), g.clamp(0, 255), b.clamp(0, 255))
end
else
# differential mode
colors = [0, 0]
colors[0] = bin >> 40 & 0xf8f8f8
colors[1] = colors[0] + (dr << 19) + (dg << 11) + (db << 3)
colors[0] = colors[0] | (colors[0] >> 5 & 0x70707)
colors[1] = colors[1] | (colors[1] >> 5 & 0x70707)
codes = [bin >> 37 & 7, bin >> 34 & 7]
subblocks = Etc1SubblockTable[bin[32]]
16.times do |i|
modifier = Etc1ModifierTable[codes[subblocks[i]]][bin[i]]
etc1colormod_append(mem, colors[subblocks[i]], bin[i + 16] == 0 ? modifier : -modifier)
end
end
end
mem
end
def self.decode_etc2alpha_block(bin)
if bin & 0xf0000000000000 == 0
((bin >> 56).chr) * 16
else
mem = String.new(capacity: 16)
base = bin >> 56
mult = bin >> 52 & 0xf
table = Etc2AlphaModTable[bin >> 48 & 0xf]
(0...16).each{|i| BinUtils.append_int8!(mem, (base + table[bin >> i*3 & 7] * mult).clamp(0, 255))}
mem
end
end
# convert 16bit float
def self.n2f(n)
case n