private byte[] decompressDxt1(TpcTexture texture, ByteArrayInputStream src) throws IOException {
int width = texture.getWidth();
int height = texture.getHeight();
int size = width * height * 4;
int pitch = width * 4;
byte[] dest = new byte[size];
for (int ty = 3; ty < height; ty += 4) {
for (int tx = 0; tx < width; tx += 4) {
int color0 = readShort(src) & 0xffff;
int color1 = readShort(src) & 0xffff;
int colors = readInt(src);
blended[0] = convert565To8888(color0);
blended[1] = convert565To8888(color1);
if (color0 > color1) {
blended[2] = interpolate32(0.33333333333333333333f, blended[0], blended[1]);
blended[3] = interpolate32(0.66666666666666666666f, blended[0], blended[1]);
} else {
blended[2] = interpolate32(0.5f, blended[0], blended[1]);
blended[3] = 0;
}
int cpx = colors;
int blockWidth = Math.min(width, 4);
int blockHeight = Math.min(height, 4);
for (int y = 0; y < blockHeight; ++y) {
for (int x = 0; x < blockWidth; ++x) {
int destX = tx + x;
int destY = height - 1 - (ty - blockHeight + y);
int pixel = blended[cpx & 3];
// System.out.println(destY);
cpx >>= 2;
if ((destX < width) && (destY < height)) {
int offset = destY * pitch + destX * 4;
writeBeUInt32(dest, pixel, offset);
}
}
}
}
}
return dest;
}
private byte[] decompressDxt5(TpcTexture texture, ByteArrayInputStream src) throws IOException {
int width = texture.getWidth();
int height = texture.getHeight();
int size = width * height * 4;
int pitch = width * 4;
byte[] dest = new byte[size];
for (int ty = height; ty > 0; ty -= 4) {
// for (int ty = 3; ty < height; ty += 4) {
for (int tx = 0; tx < width; tx += 4) {
int alpha0 = readByte(src);
int alpha1 = readByte(src);
long alphabl = read48LE(src);
int color0 = readShort(src) & 0xffff;
int color1 = readShort(src) & 0xffff;
long colors = little2big(readInt(src)) & 0xffffffffl;
alphab[0] = alpha0;
alphab[1] = alpha1;
if (alpha0 > alpha1) {
alphab[2] =
(byte) ((6.0f * (double) alphab[0] + 1.0f * (double) alphab[1] + 3.0f) / 7.0f);
alphab[3] =
(byte) ((5.0f * (double) alphab[0] + 2.0f * (double) alphab[1] + 3.0f) / 7.0f);
alphab[4] =
(byte) ((4.0f * (double) alphab[0] + 3.0f * (double) alphab[1] + 3.0f) / 7.0f);
alphab[5] =
(byte) ((3.0f * (double) alphab[0] + 4.0f * (double) alphab[1] + 3.0f) / 7.0f);
alphab[6] =
(byte) ((2.0f * (double) alphab[0] + 5.0f * (double) alphab[1] + 3.0f) / 7.0f);
alphab[7] =
(byte) ((1.0f * (double) alphab[0] + 6.0f * (double) alphab[1] + 3.0f) / 7.0f);
} else {
alphab[2] =
(byte) ((4.0f * (double) alphab[0] + 1.0f * (double) alphab[1] + 2.0f) / 5.0f);
alphab[3] =
(byte) ((3.0f * (double) alphab[0] + 2.0f * (double) alphab[1] + 2.0f) / 5.0f);
alphab[4] =
(byte) ((2.0f * (double) alphab[0] + 3.0f * (double) alphab[1] + 2.0f) / 5.0f);
alphab[5] =
(byte) ((1.0f * (double) alphab[0] + 4.0f * (double) alphab[1] + 2.0f) / 5.0f);
alphab[6] = 0;
alphab[7] = 255;
}
blended[0] = convert565To8888(color0) & 0xFFFFFF00;
blended[1] = convert565To8888(color1) & 0xFFFFFF00;
blended[2] = interpolate32(0.333333f, blended[0], blended[1]);
blended[3] = interpolate32(0.666666f, blended[0], blended[1]);
long cpx = colors;
int blockWidth = Math.min(width, 4);
int blockHeight = Math.min(height, 4);
for (byte y = 0; y < blockHeight; ++y) {
for (byte x = 0; x < blockWidth; ++x) {
int destX = tx + x;
int destY = height - 1 - (ty - blockHeight + y);
int alpha = alphab[(int) ((alphabl >> (3 * (4 * (3 - y) + x))) & 7)] & 0xff;
long pixel = (blended[(int) (cpx & 3)] | alpha) & 0xffffffffl;
cpx >>= 2;
if ((destX < width) && (destY < height)) {
writeBeUInt32(dest, (int) pixel, destY * pitch + destX * 4);
}
}
}
}
}
return dest;
}
