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add EAC support

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This commit is contained in:
Ishotihadus
2019-12-21 00:08:01 +09:00
parent d3111e1cad
commit af25ef731b
5 changed files with 227 additions and 13 deletions
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ext/decoders/native/etc.c
+96 -2
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@@ -284,8 +284,7 @@ static void decode_etc2a8_block(const uint8_t *data, uint32_t *outbuf) {
// 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;
uint_fast64_t l = bton64(*(uint64_t*)data);
for (int i = 0; i < 16; i++, l >>= 3)
((uint8_t *)(outbuf + WriteOrderTableRev[i]))[3] = clamp(data[0] + multiplier * table[l & 7]);
} else {
@@ -295,6 +294,31 @@ static void decode_etc2a8_block(const uint8_t *data, uint32_t *outbuf) {
}
}
static void decode_eac_block(const uint8_t *data, int color, uint32_t *outbuf) {
uint_fast8_t multiplier = data[1] >> 1 & 0x78;
if (multiplier == 0)
multiplier = 1;
const int_fast8_t *table = Etc2AlphaModTable[data[1] & 0xf];
uint_fast64_t l = bton64(*(uint64_t*)data);
for (int i = 0; i < 16; i++, l >>= 3) {
int_fast16_t val = data[0] * 8 + multiplier * table[l & 7] + 4;
((uint8_t *)(outbuf + WriteOrderTableRev[i]))[color] = val < 0 ? 0 : val >= 2048 ? 0xff : val >> 3;
}
}
static void decode_eac_signed_block(const uint8_t *data, int color, uint32_t *outbuf) {
int8_t base = (int8_t)data[0];
uint_fast8_t multiplier = data[1] >> 1 & 0x78;
if (multiplier == 0)
multiplier = 1;
const int_fast8_t *table = Etc2AlphaModTable[data[1] & 0xf];
uint_fast64_t l = bton64(*(uint64_t*)data);
for (int i = 0; i < 16; i++, l >>= 3) {
int_fast16_t val = base * 8 + multiplier * table[l & 7] + 1023;
((uint8_t *)(outbuf + WriteOrderTableRev[i]))[color] = val < 0 ? 0 : val >= 2048 ? 0xff : val >> 3;
}
}
int decode_etc1(const uint8_t *data, const long w, const long h, uint32_t *image) {
long num_blocks_x = (w + 3) / 4;
long num_blocks_y = (h + 3) / 4;
@@ -347,3 +371,73 @@ int decode_etc2a8(const uint8_t *data, const long w, const long h, uint32_t *ima
}
return 1;
}
int decode_eacr(const uint8_t *data, const long w, const long h, uint32_t *image) {
long num_blocks_x = (w + 3) / 4;
long num_blocks_y = (h + 3) / 4;
uint32_t buffer[16];
uint32_t base_buffer[16];
for (int i = 0; i < 16; i++)
base_buffer[i] = color(0, 0, 0, 255);
for (long by = 0; by < num_blocks_y; by++) {
for (long bx = 0; bx < num_blocks_x; bx++, data += 8) {
memcpy(buffer, base_buffer, sizeof(buffer));
decode_eac_block(data, 0, buffer);
copy_block_buffer(bx, by, w, h, 4, 4, buffer, image);
}
}
return 1;
}
int decode_eacr_signed(const uint8_t *data, const long w, const long h, uint32_t *image) {
long num_blocks_x = (w + 3) / 4;
long num_blocks_y = (h + 3) / 4;
uint32_t buffer[16];
uint32_t base_buffer[16];
for (int i = 0; i < 16; i++)
base_buffer[i] = color(0, 0, 0, 255);
for (long by = 0; by < num_blocks_y; by++) {
for (long bx = 0; bx < num_blocks_x; bx++, data += 8) {
memcpy(buffer, base_buffer, sizeof(buffer));
decode_eac_signed_block(data, 0, buffer);
copy_block_buffer(bx, by, w, h, 4, 4, buffer, image);
}
}
return 1;
}
int decode_eacrg(const uint8_t *data, const long w, const long h, uint32_t *image) {
long num_blocks_x = (w + 3) / 4;
long num_blocks_y = (h + 3) / 4;
uint32_t buffer[16];
uint32_t base_buffer[16];
for (int i = 0; i < 16; i++)
base_buffer[i] = color(0, 0, 0, 255);
for (long by = 0; by < num_blocks_y; by++) {
for (long bx = 0; bx < num_blocks_x; bx++, data += 16) {
memcpy(buffer, base_buffer, sizeof(buffer));
decode_eac_block(data, 0, buffer);
decode_eac_block(data + 8, 1, buffer);
copy_block_buffer(bx, by, w, h, 4, 4, buffer, image);
}
}
return 1;
}
int decode_eacrg_signed(const uint8_t *data, const long w, const long h, uint32_t *image) {
long num_blocks_x = (w + 3) / 4;
long num_blocks_y = (h + 3) / 4;
uint32_t buffer[16];
uint32_t base_buffer[16];
for (int i = 0; i < 16; i++)
base_buffer[i] = color(0, 0, 0, 255);
for (long by = 0; by < num_blocks_y; by++) {
for (long bx = 0; bx < num_blocks_x; bx++, data += 16) {
memcpy(buffer, base_buffer, sizeof(buffer));
decode_eac_signed_block(data, 0, buffer);
decode_eac_signed_block(data + 8, 1, buffer);
copy_block_buffer(bx, by, w, h, 4, 4, buffer, image);
}
}
return 1;
}