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add pvrtc1 4bpp support

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This commit is contained in:
Ishotihadus
2019-12-12 03:13:20 +09:00
parent aa29a229ea
commit 89347bbdbe
4 changed files with 287 additions and 4 deletions
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ext/decoders/native/main.c
+26
View File
@@ -1,6 +1,7 @@
#include "astc.h"
#include "dxtc.h"
#include "etc.h"
#include "pvrtc.h"
#include "rgb.h"
#include <ruby.h>
#include <stdint.h>
@@ -212,6 +213,30 @@ static VALUE rb_decode_dxt5(VALUE self, VALUE rb_data, VALUE w, VALUE h)
return ret;
}
/*
* Decode image from PVRTC1 4bpp compressed binary
*
* @param [String] rb_data binary to decode
* @param [Integer] w image width
* @param [Integer] h image height
* @return [String] decoded rgba binary
*/
static VALUE rb_decode_pvrtc1_4bpp(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.");
return Qnil;
}
size_t buffer_length = FIX2LONG(w) * FIX2LONG(h) * 8;
VALUE ret = rb_str_buf_new(buffer_length);
if (!decode_pvrtc_4bpp((uint8_t*)RSTRING_PTR(rb_data), FIX2INT(w), FIX2INT(h), (uint32_t*)RSTRING_PTR(ret))) {
rb_raise(rb_eStandardError, "internal error");
return Qnil;
}
rb_str_set_len(ret, buffer_length);
return ret;
}
void Init_native()
{
VALUE mMikunyan = rb_define_module("Mikunyan");
@@ -227,4 +252,5 @@ void Init_native()
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);
rb_define_module_function(mDecodeHelper, "decode_pvrtc1_4bpp", rb_decode_pvrtc1_4bpp, 3);
}
ext/decoders/native/pvrtc.c
+230
View File
@@ -0,0 +1,230 @@
#include "pvrtc.h"
#include "common.h"
#include <stdint.h>
#include <string.h>
#define MORTON_POS(x, y) (morton_table_buf[num_blocks_x * (y) + (x)])
typedef struct {
uint8_t a_r;
uint8_t a_g;
uint8_t a_b;
uint8_t a_a;
uint8_t b_r;
uint8_t b_g;
uint8_t b_b;
uint8_t b_a;
} PVRTCTexelColor;
static inline uint32_t color(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
#if BYTE_ORDER == LITTLE_ENDIAN
return r | g << 8 | b << 16 | a << 24;
#else
return a | b << 8 | g << 16 | r << 24;
#endif
}
static inline int morton_index(const int x, const int y, const int numblocks_x, const int numblocks_y)
{
const int min_dim = numblocks_x <= numblocks_y ? numblocks_x : numblocks_y;
int offset = 0, shift = 0;
for (int mask = 1; mask < min_dim; mask <<= 1, shift++) {
offset |= (((y & mask) | ((x & mask) << 1))) << shift;
}
offset |= ((x | y) >> shift) << (shift * 2);
return offset;
}
static void applicate_color_4bpp(const uint8_t* data, const PVRTCTexelColor colors[9], uint32_t buf[16])
{
typedef struct {
uint16_t a_r;
uint16_t a_g;
uint16_t a_b;
uint16_t a_a;
uint16_t b_r;
uint16_t b_g;
uint16_t b_b;
uint16_t b_a;
} PVRTCInterpColor;
static const int INTERP_WEIGHT[4][3] = { { 2, 2, 0 }, { 1, 3, 0 }, { 0, 4, 0 }, { 0, 3, 1 } };
PVRTCInterpColor interp_colors[16] = {};
for (int cy = 0, c = 0; cy < 4; cy++) {
for (int cx = 0; cx < 4; cx++, c++) {
for (int acy = 0, ac = 0; acy < 3; acy++) {
for (int acx = 0; acx < 3; acx++, ac++) {
int interp_weight = INTERP_WEIGHT[cx][acx] * INTERP_WEIGHT[cy][acy];
interp_colors[c].a_r += colors[ac].a_r * interp_weight;
interp_colors[c].a_g += colors[ac].a_g * interp_weight;
interp_colors[c].a_b += colors[ac].a_b * interp_weight;
interp_colors[c].a_a += colors[ac].a_a * interp_weight;
interp_colors[c].b_r += colors[ac].b_r * interp_weight;
interp_colors[c].b_g += colors[ac].b_g * interp_weight;
interp_colors[c].b_b += colors[ac].b_b * interp_weight;
interp_colors[c].b_a += colors[ac].b_a * interp_weight;
}
}
interp_colors[c].a_r = (interp_colors[c].a_r >> 1) + (interp_colors[c].a_r >> 6);
interp_colors[c].a_g = (interp_colors[c].a_g >> 1) + (interp_colors[c].a_g >> 6);
interp_colors[c].a_b = (interp_colors[c].a_b >> 1) + (interp_colors[c].a_b >> 6);
interp_colors[c].a_a = (interp_colors[c].a_a) + (interp_colors[c].a_a >> 4);
interp_colors[c].b_r = (interp_colors[c].b_r >> 1) + (interp_colors[c].b_r >> 6);
interp_colors[c].b_g = (interp_colors[c].b_g >> 1) + (interp_colors[c].b_g >> 6);
interp_colors[c].b_b = (interp_colors[c].b_b >> 1) + (interp_colors[c].b_b >> 6);
interp_colors[c].b_a = (interp_colors[c].b_a) + (interp_colors[c].b_a >> 4);
}
}
int mod_mode = data[4] & 1;
#if BYTE_ORDER == LITTLE_ENDIAN
uint32_t mod_bits = *(uint32_t*)data;
#else
uint32_t mod_bits = data[0] | data[1] << 8 | data[2] << 16 | data[3] << 24;
#endif
if (mod_mode) {
// punch-through
for (int i = 0; i < 16; i++, mod_bits >>= 2) {
int r, g, b, a;
switch (mod_bits & 3) {
case 0:
r = interp_colors[i].a_r;
g = interp_colors[i].a_g;
b = interp_colors[i].a_b;
a = interp_colors[i].a_a;
break;
case 3:
r = interp_colors[i].b_r;
g = interp_colors[i].b_g;
b = interp_colors[i].b_b;
a = interp_colors[i].b_a;
break;
default:
r = (interp_colors[i].a_r + interp_colors[i].b_r) / 2;
g = (interp_colors[i].a_g + interp_colors[i].b_g) / 2;
b = (interp_colors[i].a_b + interp_colors[i].b_b) / 2;
a = (mod_bits & 3) == 2 ? 0 : (interp_colors[i].a_a + interp_colors[i].b_a) / 2;
}
buf[i] = color(r, g, b, a);
}
} else {
// standard
for (int i = 0; i < 16; i++, mod_bits >>= 2) {
int r, g, b, a;
switch (mod_bits & 3) {
case 0:
r = interp_colors[i].a_r;
g = interp_colors[i].a_g;
b = interp_colors[i].a_b;
a = interp_colors[i].a_a;
break;
case 1:
r = (interp_colors[i].a_r * 5 + interp_colors[i].b_r * 3) / 8;
g = (interp_colors[i].a_g * 5 + interp_colors[i].b_g * 3) / 8;
b = (interp_colors[i].a_b * 5 + interp_colors[i].b_b * 3) / 8;
a = (interp_colors[i].a_a * 5 + interp_colors[i].b_a * 3) / 8;
break;
case 2:
r = (interp_colors[i].a_r * 3 + interp_colors[i].b_r * 5) / 8;
g = (interp_colors[i].a_g * 3 + interp_colors[i].b_g * 5) / 8;
b = (interp_colors[i].a_b * 3 + interp_colors[i].b_b * 5) / 8;
a = (interp_colors[i].a_a * 3 + interp_colors[i].b_a * 5) / 8;
break;
case 3:
r = interp_colors[i].b_r;
g = interp_colors[i].b_g;
b = interp_colors[i].b_b;
a = interp_colors[i].b_a;
break;
}
buf[i] = color(r, g, b, a);
}
}
}
static inline void expand_color(const uint8_t* data, PVRTCTexelColor* color)
{
#if BYTE_ORDER == LITTLE_ENDIAN
uint16_t ca = *(uint16_t*)(data + 4);
uint16_t cb = *(uint16_t*)(data + 6);
#else
uint16_t ca = data[4] | data[5] << 8;
uint16_t cb = data[6] | data[7] << 8;
#endif
if (ca & 0x8000) {
color->a_r = ca >> 10 & 0x1f;
color->a_g = ca >> 5 & 0x1f;
color->a_b = (ca & 0x1e) | (ca >> 4 & 1);
color->a_a = 0xf;
} else {
color->a_r = (ca >> 7 & 0x1e) | (ca >> 11 & 1);
color->a_g = (ca >> 3 & 0x1e) | (ca >> 7 & 1);
color->a_b = (ca << 1 & 0x1c) | (ca >> 2 & 3);
color->a_a = ca >> 11 & 0xe;
}
if (cb & 0x8000) {
color->b_r = cb >> 10 & 0x1f;
color->b_g = cb >> 5 & 0x1f;
color->b_b = cb & 0x1f;
color->b_a = 0xf;
} else {
color->b_r = (cb >> 7 & 0x1e) | (cb >> 11 & 1);
color->b_g = (cb >> 3 & 0x1e) | (cb >> 7 & 1);
color->b_b = (cb << 1 & 0x1e) | (cb >> 3 & 1);
color->b_a = cb >> 11 & 0xe;
}
}
int decode_pvrtc_4bpp(const uint8_t* 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 num_blocks = num_blocks_x * num_blocks_y;
int copy_length_last = (w + 3) % 4 + 1;
PVRTCTexelColor* texel_colors = (PVRTCTexelColor*)malloc(sizeof(PVRTCTexelColor) * num_blocks);
if (texel_colors == NULL)
return 0;
const uint8_t* d = data;
for (int i = 0; i < num_blocks; i++, d += 8)
expand_color(d, texel_colors + i);
int* morton_table_buf = (int*)malloc(sizeof(int) * num_blocks);
if (morton_table_buf == NULL) {
free(texel_colors);
return 0;
}
for (int y = 0; y < num_blocks_y; y++)
for (int x = 0; x < num_blocks_x; x++)
MORTON_POS(x, y) = morton_index(x, y, num_blocks_x, num_blocks_y);
uint32_t buffer[16];
uint32_t* buffer_end = buffer + 16;
PVRTCTexelColor colors[9];
int pos_x[3], pos_y[3];
for (int by = 0; by < num_blocks_y; by++) {
pos_y[0] = by == 0 ? 0 : by - 1;
pos_y[1] = by;
pos_y[2] = by == num_blocks_y - 1 ? num_blocks_y - 1 : by + 1;
for (int bx = 0, x = 0; bx < num_blocks_x; bx++, d += 8, x += 4) {
pos_x[0] = bx == 0 ? 0 : bx - 1;
pos_x[1] = bx;
pos_x[2] = bx == num_blocks_x - 1 ? num_blocks_x - 1 : bx + 1;
for (int cy = 0, c = 0; cy < 3; cy++)
for (int cx = 0; cx < 3; cx++, c++)
colors[c] = texel_colors[MORTON_POS(pos_x[cx], pos_y[cy])];
applicate_color_4bpp(data + MORTON_POS(bx, by) * 8, colors, buffer);
int copy_length = (bx < num_blocks_x - 1 ? 4 : copy_length_last) * 4;
uint32_t* b = buffer;
for (int y = h - by * 4 - 1; b < buffer_end && y >= 0; y--, b += 4)
memcpy(image + y * w + x, b, copy_length);
}
}
free(morton_table_buf);
free(texel_colors);
return 1;
}
ext/decoders/native/pvrtc.h
+8
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@@ -0,0 +1,8 @@
#ifndef PVRTC_H
#define PVRTC_H
#include <stdint.h>
int decode_pvrtc_4bpp(const uint8_t*, const int, const int, uint32_t*);
#endif /* end of include guard: PVRTC_H */