Ishotihadus
400 lines
18 KiB
C
400 lines
18 KiB
C
#include "etc.h"
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#include "common.h"
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#include <stdint.h>
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#include <string.h>
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const uint_fast8_t WriteOrderTable[16] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 };
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const uint_fast8_t WriteOrderTableRev[16] = { 15, 11, 7, 3, 14, 10, 6, 2, 13, 9, 5, 1, 12, 8, 4, 0 };
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const uint_fast8_t Etc1ModifierTable[8][2] = { { 2, 8 }, { 5, 17 }, { 9, 29 }, { 13, 42 }, { 18, 60 }, { 24, 80 }, { 33, 106 }, { 47, 183 } };
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const uint_fast8_t Etc2aModifierTable[2][8][2] = {
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{ { 0, 8 }, { 0, 17 }, { 0, 29 }, { 0, 42 }, { 0, 60 }, { 0, 80 }, { 0, 106 }, { 0, 183 } },
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{ { 2, 8 }, { 5, 17 }, { 9, 29 }, { 13, 42 }, { 18, 60 }, { 24, 80 }, { 33, 106 }, { 47, 183 } }
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};
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const 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 } };
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const uint_fast8_t Etc2DistanceTable[8] = { 3, 6, 11, 16, 23, 32, 41, 64 };
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const int_fast8_t Etc2AlphaModTable[16][8] = {
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{ -3, -6, -9, -15, 2, 5, 8, 14 },
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{ -3, -7, -10, -13, 2, 6, 9, 12 },
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{ -2, -5, -8, -13, 1, 4, 7, 12 },
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{ -2, -4, -6, -13, 1, 3, 5, 12 },
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{ -3, -6, -8, -12, 2, 5, 7, 11 },
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{ -3, -7, -9, -11, 2, 6, 8, 10 },
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{ -4, -7, -8, -11, 3, 6, 7, 10 },
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{ -3, -5, -8, -11, 2, 4, 7, 10 },
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{ -2, -6, -8, -10, 1, 5, 7, 9 },
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{ -2, -5, -8, -10, 1, 4, 7, 9 },
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{ -2, -4, -8, -10, 1, 3, 7, 9 },
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{ -2, -5, -7, -10, 1, 4, 6, 9 },
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{ -3, -4, -7, -10, 2, 3, 6, 9 },
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{ -1, -2, -3, -10, 0, 1, 2, 9 },
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{ -4, -6, -8, -9, 3, 5, 7, 8 },
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{ -3, -5, -7, -9, 2, 4, 6, 8 }
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};
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#if BYTE_ORDER == LITTLE_ENDIAN
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static const uint_fast32_t TRANSPARENT_MASK = 0x00ffffff;
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#else
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static const uint_fast32_t TRANSPARENT_MASK = 0xffffff00;
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#endif
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static inline uint_fast32_t color(uint_fast8_t r, uint_fast8_t g, uint_fast8_t b, uint_fast8_t a)
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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return r | g << 8 | b << 16 | a << 24;
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#else
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return a | b << 8 | g << 16 | r << 24;
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#endif
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}
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static inline uint_fast8_t clamp(const int n)
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{
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return n < 0 ? 0 : n > 255 ? 255 : n;
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}
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static inline uint32_t applicate_color(uint_fast8_t c[3], int_fast16_t m)
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{
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return color(clamp(c[0] + m), clamp(c[1] + m), clamp(c[2] + m), 255);
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}
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static inline uint32_t applicate_color_alpha(uint_fast8_t c[3], int_fast16_t m, int transparent)
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{
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return color(clamp(c[0] + m), clamp(c[1] + m), clamp(c[2] + m), transparent ? 0 : 255);
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}
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static inline uint32_t applicate_color_raw(uint_fast8_t c[3])
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{
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return color(c[0], c[1], c[2], 255);
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}
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static inline void decode_etc1_block(const uint8_t* data, uint32_t* outbuf)
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{
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const uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 }; // Table codewords
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const uint_fast8_t* table = Etc1SubblockTable[data[3] & 1];
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uint_fast8_t c[2][3];
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if (data[3] & 2) {
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// diff bit == 1
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c[0][0] = data[0] & 0xf8;
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c[0][1] = data[1] & 0xf8;
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c[0][2] = data[2] & 0xf8;
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c[1][0] = c[0][0] + (data[0] << 3 & 0x18) - (data[0] << 3 & 0x20);
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c[1][1] = c[0][1] + (data[1] << 3 & 0x18) - (data[1] << 3 & 0x20);
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c[1][2] = c[0][2] + (data[2] << 3 & 0x18) - (data[2] << 3 & 0x20);
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c[0][0] |= c[0][0] >> 5;
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c[0][1] |= c[0][1] >> 5;
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c[0][2] |= c[0][2] >> 5;
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c[1][0] |= c[1][0] >> 5;
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c[1][1] |= c[1][1] >> 5;
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c[1][2] |= c[1][2] >> 5;
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} else {
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// diff bit == 0
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c[0][0] = (data[0] & 0xf0) | data[0] >> 4;
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c[1][0] = (data[0] & 0x0f) | data[0] << 4;
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c[0][1] = (data[1] & 0xf0) | data[1] >> 4;
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c[1][1] = (data[1] & 0x0f) | data[1] << 4;
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c[0][2] = (data[2] & 0xf0) | data[2] >> 4;
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c[1][2] = (data[2] & 0x0f) | data[2] << 4;
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}
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uint_fast16_t j = data[6] << 8 | data[7]; // less significant pixel index bits
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uint_fast16_t k = data[4] << 8 | data[5]; // more significant pixel index bits
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
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uint_fast8_t s = table[i];
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uint_fast8_t m = Etc1ModifierTable[code[s]][j & 1];
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outbuf[WriteOrderTable[i]] = applicate_color(c[s], k & 1 ? -m : m);
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}
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}
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void decode_etc1(const void* data, const int w, const int h, uint32_t* image)
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{
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int num_blocks_x = (w + 3) / 4;
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int num_blocks_y = (h + 3) / 4;
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int copy_length_last = (w + 3) % 4 + 1;
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uint32_t buf[16];
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uint32_t* buf_end = buf + 16;
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const uint8_t* d = (uint8_t*)data;
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for (int by = 0; by < num_blocks_y; by++) {
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for (int bx = 0, x = 0; bx < num_blocks_x; bx++, d += 8, x += 4) {
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decode_etc1_block(d, buf);
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int copy_length = (bx < num_blocks_x - 1 ? 4 : copy_length_last) * 4;
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uint32_t* b = buf;
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for (int y = h - 1 - by * 4; b < buf_end && y >= 0; y--, b += 4)
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memcpy(image + y * w + x, b, copy_length);
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}
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}
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}
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static inline void decode_etc2_block(const uint8_t* data, uint32_t* outbuf)
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{
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uint_fast16_t j = data[6] << 8 | data[7]; // 15 -> 0
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uint_fast32_t k = data[4] << 8 | data[5]; // 31 -> 16
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uint_fast8_t c[3][3] = {};
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if (data[3] & 2) {
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// diff bit == 1
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uint_fast8_t r = data[0] & 0xf8;
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int_fast16_t dr = (data[0] << 3 & 0x18) - (data[0] << 3 & 0x20);
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uint_fast8_t g = data[1] & 0xf8;
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int_fast16_t dg = (data[1] << 3 & 0x18) - (data[1] << 3 & 0x20);
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uint_fast8_t b = data[2] & 0xf8;
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int_fast16_t db = (data[2] << 3 & 0x18) - (data[2] << 3 & 0x20);
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if (r + dr < 0 || r + dr > 255) {
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// T
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c[0][0] = (data[0] << 3 & 0xc0) | (data[0] << 4 & 0x30) | (data[0] >> 1 & 0xc) | (data[0] & 3);
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c[0][1] = (data[1] & 0xf0) | data[1] >> 4;
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c[0][2] = (data[1] & 0x0f) | data[1] << 4;
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c[1][0] = (data[2] & 0xf0) | data[2] >> 4;
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c[1][1] = (data[2] & 0x0f) | data[2] << 4;
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c[1][2] = (data[3] & 0xf0) | data[3] >> 4;
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const uint_fast8_t d = Etc2DistanceTable[(data[3] >> 1 & 6) | (data[3] & 1)];
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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) };
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k <<= 1;
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1)
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outbuf[WriteOrderTable[i]] = color_set[(k & 2) | (j & 1)];
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} else if (g + dg < 0 || g + dg > 255) {
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// H
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c[0][0] = (data[0] << 1 & 0xf0) | (data[0] >> 3 & 0xf);
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c[0][1] = (data[0] << 5 & 0xe0) | (data[1] & 0x10);
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c[0][1] |= c[0][1] >> 4;
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c[0][2] = (data[1] & 8) | (data[1] << 1 & 6) | data[2] >> 7;
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c[0][2] |= c[0][2] << 4;
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c[1][0] = (data[2] << 1 & 0xf0) | (data[2] >> 3 & 0xf);
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c[1][1] = (data[2] << 5 & 0xe0) | (data[3] >> 3 & 0x10);
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c[1][1] |= c[1][1] >> 4;
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c[1][2] = (data[3] << 1 & 0xf0) | (data[3] >> 3 & 0xf);
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uint_fast8_t d = (data[3] & 4) | (data[3] << 1 & 2);
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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]))))
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++d;
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d = Etc2DistanceTable[d];
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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) };
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k <<= 1;
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1)
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outbuf[WriteOrderTable[i]] = color_set[(k & 2) | (j & 1)];
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} else if (b + db < 0 || b + db > 255) {
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// planar
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c[0][0] = (data[0] << 1 & 0xfc) | (data[0] >> 5 & 3);
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c[0][1] = (data[0] << 7 & 0x80) | (data[1] & 0x7e) | (data[0] & 1);
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c[0][2] = (data[1] << 7 & 0x80) | (data[2] << 2 & 0x60) | (data[2] << 3 & 0x18) | (data[3] >> 5 & 4);
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c[0][2] |= c[0][2] >> 6;
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c[1][0] = (data[3] << 1 & 0xf8) | (data[3] << 2 & 4) | (data[3] >> 5 & 3);
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c[1][1] = (data[4] & 0xfe) | data[4] >> 7;
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c[1][2] = (data[4] << 7 & 0x80) | (data[5] >> 1 & 0x7c);
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c[1][2] |= c[1][2] >> 6;
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c[2][0] = (data[5] << 5 & 0xe0) | (data[6] >> 3 & 0x1c) | (data[5] >> 1 & 3);
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c[2][1] = (data[6] << 3 & 0xf8) | (data[7] >> 5 & 0x6) | (data[6] >> 4 & 1);
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c[2][2] = data[7] << 2 | (data[7] >> 4 & 3);
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for (int y = 0, i = 0; y < 4; y++) {
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for (int x = 0; x < 4; x++, i++) {
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uint8_t r = clamp((x * (c[1][0] - c[0][0]) + y * (c[2][0] - c[0][0]) + 4 * c[0][0] + 2) >> 2);
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uint8_t g = clamp((x * (c[1][1] - c[0][1]) + y * (c[2][1] - c[0][1]) + 4 * c[0][1] + 2) >> 2);
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uint8_t b = clamp((x * (c[1][2] - c[0][2]) + y * (c[2][2] - c[0][2]) + 4 * c[0][2] + 2) >> 2);
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outbuf[i] = color(r, g, b, 255);
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}
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}
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} else {
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// differential
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const uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 };
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const uint_fast8_t* table = Etc1SubblockTable[data[3] & 1];
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c[0][0] = r | r >> 5;
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c[0][1] = g | g >> 5;
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c[0][2] = b | b >> 5;
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c[1][0] = r + dr;
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c[1][1] = g + dg;
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c[1][2] = b + db;
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c[1][0] |= c[1][0] >> 5;
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c[1][1] |= c[1][1] >> 5;
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c[1][2] |= c[1][2] >> 5;
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
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uint_fast8_t s = table[i];
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uint_fast8_t m = Etc1ModifierTable[code[s]][j & 1];
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outbuf[WriteOrderTable[i]] = applicate_color(c[s], k & 1 ? -m : m);
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}
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}
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} else {
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// individual (diff bit == 0)
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const uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 };
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const uint_fast8_t* table = Etc1SubblockTable[data[3] & 1];
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c[0][0] = (data[0] & 0xf0) | data[0] >> 4;
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c[1][0] = (data[0] & 0x0f) | data[0] << 4;
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c[0][1] = (data[1] & 0xf0) | data[1] >> 4;
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c[1][1] = (data[1] & 0x0f) | data[1] << 4;
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c[0][2] = (data[2] & 0xf0) | data[2] >> 4;
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c[1][2] = (data[2] & 0x0f) | data[2] << 4;
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
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uint_fast8_t s = table[i];
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uint_fast8_t m = Etc1ModifierTable[code[s]][j & 1];
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outbuf[WriteOrderTable[i]] = applicate_color(c[s], k & 1 ? -m : m);
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}
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}
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}
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static inline void decode_etc2a1_block(const uint8_t* data, uint32_t* outbuf)
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{
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uint_fast16_t j = data[6] << 8 | data[7]; // 15 -> 0
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uint_fast32_t k = data[4] << 8 | data[5]; // 31 -> 16
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uint_fast8_t c[3][3] = {};
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int obaq = data[3] >> 1 & 1;
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// diff bit == 1
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uint_fast8_t r = data[0] & 0xf8;
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int_fast16_t dr = (data[0] << 3 & 0x18) - (data[0] << 3 & 0x20);
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uint_fast8_t g = data[1] & 0xf8;
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int_fast16_t dg = (data[1] << 3 & 0x18) - (data[1] << 3 & 0x20);
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uint_fast8_t b = data[2] & 0xf8;
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int_fast16_t db = (data[2] << 3 & 0x18) - (data[2] << 3 & 0x20);
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if (r + dr < 0 || r + dr > 255) {
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// T
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c[0][0] = (data[0] << 3 & 0xc0) | (data[0] << 4 & 0x30) | (data[0] >> 1 & 0xc) | (data[0] & 3);
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c[0][1] = (data[1] & 0xf0) | data[1] >> 4;
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c[0][2] = (data[1] & 0x0f) | data[1] << 4;
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c[1][0] = (data[2] & 0xf0) | data[2] >> 4;
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c[1][1] = (data[2] & 0x0f) | data[2] << 4;
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c[1][2] = (data[3] & 0xf0) | data[3] >> 4;
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const uint_fast8_t d = Etc2DistanceTable[(data[3] >> 1 & 6) | (data[3] & 1)];
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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) };
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k <<= 1;
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
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int index = (k & 2) | (j & 1);
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outbuf[WriteOrderTable[i]] = color_set[index];
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if (!obaq && index == 2)
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outbuf[WriteOrderTable[i]] &= TRANSPARENT_MASK;
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}
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} else if (g + dg < 0 || g + dg > 255) {
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// H
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c[0][0] = (data[0] << 1 & 0xf0) | (data[0] >> 3 & 0xf);
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c[0][1] = (data[0] << 5 & 0xe0) | (data[1] & 0x10);
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c[0][1] |= c[0][1] >> 4;
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c[0][2] = (data[1] & 8) | (data[1] << 1 & 6) | data[2] >> 7;
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c[0][2] |= c[0][2] << 4;
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c[1][0] = (data[2] << 1 & 0xf0) | (data[2] >> 3 & 0xf);
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c[1][1] = (data[2] << 5 & 0xe0) | (data[3] >> 3 & 0x10);
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c[1][1] |= c[1][1] >> 4;
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c[1][2] = (data[3] << 1 & 0xf0) | (data[3] >> 3 & 0xf);
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uint_fast8_t d = (data[3] & 4) | (data[3] << 1 & 2);
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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]))))
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++d;
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d = Etc2DistanceTable[d];
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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) };
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k <<= 1;
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for (int i = 0; i < 16; i++, j >>= 1, k >>= 1) {
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int index = (k & 2) | (j & 1);
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outbuf[WriteOrderTable[i]] = color_set[index];
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if (!obaq && index == 2)
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outbuf[WriteOrderTable[i]] &= TRANSPARENT_MASK;
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}
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} else if (b + db < 0 || b + db > 255) {
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// planar
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c[0][0] = (data[0] << 1 & 0xfc) | (data[0] >> 5 & 3);
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c[0][1] = (data[0] << 7 & 0x80) | (data[1] & 0x7e) | (data[0] & 1);
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c[0][2] = (data[1] << 7 & 0x80) | (data[2] << 2 & 0x60) | (data[2] << 3 & 0x18) | (data[3] >> 5 & 4);
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c[0][2] |= c[0][2] >> 6;
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c[1][0] = (data[3] << 1 & 0xf8) | (data[3] << 2 & 4) | (data[3] >> 5 & 3);
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c[1][1] = (data[4] & 0xfe) | data[4] >> 7;
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c[1][2] = (data[4] << 7 & 0x80) | (data[5] >> 1 & 0x7c);
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c[1][2] |= c[1][2] >> 6;
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c[2][0] = (data[5] << 5 & 0xe0) | (data[6] >> 3 & 0x1c) | (data[5] >> 1 & 3);
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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 y = 0, i = 0; y < 4; y++) {
|
|
for (int x = 0; x < 4; x++, 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
|
|
const uint_fast8_t code[2] = { data[3] >> 5, data[3] >> 2 & 7 };
|
|
const 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 = Etc2aModifierTable[obaq][code[s]][j & 1];
|
|
outbuf[WriteOrderTable[i]] = applicate_color_alpha(c[s], k & 1 ? -m : m, !obaq && (k & 1) && !(j & 1));
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void decode_etc2a8_block(const uint8_t* data, uint32_t* outbuf)
|
|
{
|
|
if (data[1] & 0xf0) {
|
|
// multiplier != 0
|
|
const uint_fast8_t multiplier = data[1] >> 4;
|
|
const 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] + multiplier * table[l & 7]);
|
|
} else {
|
|
// multiplier == 0 (always same as base codeword)
|
|
for (int i = 0; i < 16; i++, outbuf++)
|
|
((uint8_t*)outbuf)[3] = data[0];
|
|
}
|
|
}
|
|
|
|
void decode_etc2(const void* data, const int w, const int h, uint32_t* image)
|
|
{
|
|
int num_blocks_x = (w + 3) / 4;
|
|
int num_blocks_y = (h + 3) / 4;
|
|
int copy_length_last = (w + 3) % 4 + 1;
|
|
uint32_t buf[16];
|
|
uint32_t* buf_end = buf + 16;
|
|
const uint8_t* d = (uint8_t*)data;
|
|
for (int by = 0; by < num_blocks_y; by++) {
|
|
for (int bx = 0, x = 0; bx < num_blocks_x; bx++, d += 8, x += 4) {
|
|
decode_etc2_block(d, buf);
|
|
int copy_length = (bx < num_blocks_x - 1 ? 4 : copy_length_last) * 4;
|
|
uint32_t* b = buf;
|
|
for (int y = h - by * 4 - 1; b < buf_end && y >= 0; y--, b += 4)
|
|
memcpy(image + y * w + x, b, copy_length);
|
|
}
|
|
}
|
|
}
|
|
|
|
void decode_etc2a1(const void* data, const int w, const int h, uint32_t* image)
|
|
{
|
|
int num_blocks_x = (w + 3) / 4;
|
|
int num_blocks_y = (h + 3) / 4;
|
|
int copy_length_last = (w + 3) % 4 + 1;
|
|
uint32_t buf[16];
|
|
uint32_t* buf_end = buf + 16;
|
|
const uint8_t* d = (uint8_t*)data;
|
|
for (int by = 0; by < num_blocks_y; by++) {
|
|
for (int bx = 0, x = 0; bx < num_blocks_x; bx++, d += 8, x += 4) {
|
|
decode_etc2a1_block(d, buf);
|
|
int copy_length = (bx < num_blocks_x - 1 ? 4 : copy_length_last) * 4;
|
|
uint32_t* b = buf;
|
|
for (int y = h - by * 4 - 1; b < buf_end && y >= 0; y--, b += 4)
|
|
memcpy(image + y * w + x, b, copy_length);
|
|
}
|
|
}
|
|
}
|
|
|
|
void decode_etc2a8(const void* data, const int w, const int h, uint32_t* image)
|
|
{
|
|
int num_blocks_x = (w + 3) / 4;
|
|
int num_blocks_y = (h + 3) / 4;
|
|
int copy_length_last = (w + 3) % 4 + 1;
|
|
uint32_t buf[16];
|
|
uint32_t* buf_end = buf + 16;
|
|
const uint8_t* d = (uint8_t*)data;
|
|
for (int by = 0; by < num_blocks_y; by++) {
|
|
for (int bx = 0, x = 0; bx < num_blocks_x; bx++, d += 16, x += 4) {
|
|
decode_etc2_block(d + 8, buf);
|
|
decode_etc2a8_block(d, buf);
|
|
int copy_length = (bx < num_blocks_x - 1 ? 4 : copy_length_last) * 4;
|
|
uint32_t* b = buf;
|
|
for (int y = h - by * 4 - 1; b < buf_end && y >= 0; y--, b += 4)
|
|
memcpy(image + y * w + x, b, copy_length);
|
|
}
|
|
}
|
|
}
|