Merge pull request #8964 from RandomShaper/fix-bc-2.1
Use builtin BC decompression when libsquish not available (2.1)
This commit is contained in:
Rémi Verschelde
GitHub
commit
5f98c16d59
328
core/image.cpp
328
core/image.cpp
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@ -1460,6 +1460,330 @@ Error Image::save_png(const String &p_path) const {
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return save_png_func(p_path, image);
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};
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Error Image::_decompress_bc() {
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print_line("decompressing bc");
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int wd = width, ht = height;
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if (wd % 4 != 0) {
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wd += 4 - (wd % 4);
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}
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if (ht % 4 != 0) {
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ht += 4 - (ht % 4);
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}
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int mm;
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int size = _get_dst_image_size(wd, ht, FORMAT_RGBA, mm, mipmaps);
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DVector<uint8_t> newdata;
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newdata.resize(size);
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DVector<uint8_t>::Write w = newdata.write();
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DVector<uint8_t>::Read r = data.read();
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int rofs = 0;
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int wofs = 0;
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//print_line("width: "+itos(wd)+" height: "+itos(ht));
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int mm_w = wd;
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int mm_h = ht;
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for (int i = 0; i <= mm; i++) {
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switch (format) {
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case FORMAT_BC1: {
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int len = (mm_w * mm_h) / 16;
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uint8_t *dst = &w[wofs];
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uint32_t ofs_table[16];
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for (int x = 0; x < 4; x++) {
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for (int y = 0; y < 4; y++) {
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ofs_table[15 - (y * 4 + (3 - x))] = (x + y * mm_w) * 4;
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}
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}
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for (int j = 0; j < len; j++) {
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const uint8_t *src = &r[rofs + j * 8];
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uint16_t col_a = src[1];
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col_a <<= 8;
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col_a |= src[0];
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uint16_t col_b = src[3];
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col_b <<= 8;
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col_b |= src[2];
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uint8_t table[4][4] = {
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{ (col_a >> 11) << 3, ((col_a >> 5) & 0x3f) << 2, ((col_a)&0x1f) << 3, 255 },
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{ (col_b >> 11) << 3, ((col_b >> 5) & 0x3f) << 2, ((col_b)&0x1f) << 3, 255 },
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{ 0, 0, 0, 255 },
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{ 0, 0, 0, 255 }
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};
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if (col_a < col_b) {
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//punchrough
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table[2][0] = (int(table[0][0]) + int(table[1][0])) >> 1;
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table[2][1] = (int(table[0][1]) + int(table[1][1])) >> 1;
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table[2][2] = (int(table[0][2]) + int(table[1][2])) >> 1;
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table[3][3] = 0; //premul alpha black
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} else {
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//gradient
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table[2][0] = (int(table[0][0]) * 2 + int(table[1][0])) / 3;
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table[2][1] = (int(table[0][1]) * 2 + int(table[1][1])) / 3;
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table[2][2] = (int(table[0][2]) * 2 + int(table[1][2])) / 3;
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table[3][0] = (int(table[0][0]) + int(table[1][0]) * 2) / 3;
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table[3][1] = (int(table[0][1]) + int(table[1][1]) * 2) / 3;
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table[3][2] = (int(table[0][2]) + int(table[1][2]) * 2) / 3;
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}
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uint32_t block = src[4];
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block <<= 8;
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block |= src[5];
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block <<= 8;
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block |= src[6];
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block <<= 8;
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block |= src[7];
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int y = (j / (mm_w / 4)) * 4;
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int x = (j % (mm_w / 4)) * 4;
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int pixofs = (y * mm_w + x) * 4;
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for (int k = 0; k < 16; k++) {
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int idx = pixofs + ofs_table[k];
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dst[idx + 0] = table[block & 0x3][0];
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dst[idx + 1] = table[block & 0x3][1];
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dst[idx + 2] = table[block & 0x3][2];
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dst[idx + 3] = table[block & 0x3][3];
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block >>= 2;
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}
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}
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rofs += len * 8;
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wofs += mm_w * mm_h * 4;
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mm_w /= 2;
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mm_h /= 2;
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} break;
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case FORMAT_BC2: {
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int len = (mm_w * mm_h) / 16;
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uint8_t *dst = &w[wofs];
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uint32_t ofs_table[16];
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for (int x = 0; x < 4; x++) {
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for (int y = 0; y < 4; y++) {
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ofs_table[15 - (y * 4 + (3 - x))] = (x + y * mm_w) * 4;
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}
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}
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for (int j = 0; j < len; j++) {
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const uint8_t *src = &r[rofs + j * 16];
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uint64_t ablock = src[1];
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ablock <<= 8;
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ablock |= src[0];
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ablock <<= 8;
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ablock |= src[3];
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ablock <<= 8;
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ablock |= src[2];
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ablock <<= 8;
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ablock |= src[5];
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ablock <<= 8;
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ablock |= src[4];
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ablock <<= 8;
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ablock |= src[7];
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ablock <<= 8;
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ablock |= src[6];
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uint16_t col_a = src[8 + 1];
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col_a <<= 8;
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col_a |= src[8 + 0];
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uint16_t col_b = src[8 + 3];
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col_b <<= 8;
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col_b |= src[8 + 2];
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uint8_t table[4][4] = {
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{ (col_a >> 11) << 3, ((col_a >> 5) & 0x3f) << 2, ((col_a)&0x1f) << 3, 255 },
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{ (col_b >> 11) << 3, ((col_b >> 5) & 0x3f) << 2, ((col_b)&0x1f) << 3, 255 },
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{ 0, 0, 0, 255 },
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{ 0, 0, 0, 255 }
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};
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//always gradient
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table[2][0] = (int(table[0][0]) * 2 + int(table[1][0])) / 3;
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table[2][1] = (int(table[0][1]) * 2 + int(table[1][1])) / 3;
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table[2][2] = (int(table[0][2]) * 2 + int(table[1][2])) / 3;
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table[3][0] = (int(table[0][0]) + int(table[1][0]) * 2) / 3;
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table[3][1] = (int(table[0][1]) + int(table[1][1]) * 2) / 3;
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table[3][2] = (int(table[0][2]) + int(table[1][2]) * 2) / 3;
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uint32_t block = src[4 + 8];
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block <<= 8;
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block |= src[5 + 8];
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block <<= 8;
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block |= src[6 + 8];
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block <<= 8;
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block |= src[7 + 8];
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int y = (j / (mm_w / 4)) * 4;
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int x = (j % (mm_w / 4)) * 4;
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int pixofs = (y * mm_w + x) * 4;
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for (int k = 0; k < 16; k++) {
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uint8_t alpha = ablock & 0xf;
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alpha = int(alpha) * 255 / 15; //right way for alpha
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int idx = pixofs + ofs_table[k];
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dst[idx + 0] = table[block & 0x3][0];
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dst[idx + 1] = table[block & 0x3][1];
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dst[idx + 2] = table[block & 0x3][2];
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dst[idx + 3] = alpha;
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block >>= 2;
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ablock >>= 4;
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}
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}
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rofs += len * 16;
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wofs += mm_w * mm_h * 4;
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mm_w /= 2;
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mm_h /= 2;
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} break;
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case FORMAT_BC3: {
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int len = (mm_w * mm_h) / 16;
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uint8_t *dst = &w[wofs];
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uint32_t ofs_table[16];
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for (int x = 0; x < 4; x++) {
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for (int y = 0; y < 4; y++) {
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ofs_table[15 - (y * 4 + (3 - x))] = (x + y * mm_w) * 4;
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}
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}
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for (int j = 0; j < len; j++) {
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const uint8_t *src = &r[rofs + j * 16];
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uint8_t a_start = src[1];
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uint8_t a_end = src[0];
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uint64_t ablock = src[3];
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ablock <<= 8;
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ablock |= src[2];
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ablock <<= 8;
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ablock |= src[5];
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ablock <<= 8;
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ablock |= src[4];
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ablock <<= 8;
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ablock |= src[7];
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ablock <<= 8;
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ablock |= src[6];
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uint8_t atable[8];
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if (a_start > a_end) {
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atable[0] = (int(a_start) * 7 + int(a_end) * 0) / 7;
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atable[1] = (int(a_start) * 6 + int(a_end) * 1) / 7;
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atable[2] = (int(a_start) * 5 + int(a_end) * 2) / 7;
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atable[3] = (int(a_start) * 4 + int(a_end) * 3) / 7;
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atable[4] = (int(a_start) * 3 + int(a_end) * 4) / 7;
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atable[5] = (int(a_start) * 2 + int(a_end) * 5) / 7;
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atable[6] = (int(a_start) * 1 + int(a_end) * 6) / 7;
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atable[7] = (int(a_start) * 0 + int(a_end) * 7) / 7;
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} else {
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atable[0] = (int(a_start) * 5 + int(a_end) * 0) / 5;
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atable[1] = (int(a_start) * 4 + int(a_end) * 1) / 5;
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atable[2] = (int(a_start) * 3 + int(a_end) * 2) / 5;
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atable[3] = (int(a_start) * 2 + int(a_end) * 3) / 5;
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atable[4] = (int(a_start) * 1 + int(a_end) * 4) / 5;
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atable[5] = (int(a_start) * 0 + int(a_end) * 5) / 5;
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atable[6] = 0;
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atable[7] = 255;
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}
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uint16_t col_a = src[8 + 1];
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col_a <<= 8;
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col_a |= src[8 + 0];
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uint16_t col_b = src[8 + 3];
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col_b <<= 8;
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col_b |= src[8 + 2];
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uint8_t table[4][4] = {
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{ (col_a >> 11) << 3, ((col_a >> 5) & 0x3f) << 2, ((col_a)&0x1f) << 3, 255 },
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{ (col_b >> 11) << 3, ((col_b >> 5) & 0x3f) << 2, ((col_b)&0x1f) << 3, 255 },
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{ 0, 0, 0, 255 },
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{ 0, 0, 0, 255 }
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};
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//always gradient
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table[2][0] = (int(table[0][0]) * 2 + int(table[1][0])) / 3;
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table[2][1] = (int(table[0][1]) * 2 + int(table[1][1])) / 3;
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table[2][2] = (int(table[0][2]) * 2 + int(table[1][2])) / 3;
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table[3][0] = (int(table[0][0]) + int(table[1][0]) * 2) / 3;
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table[3][1] = (int(table[0][1]) + int(table[1][1]) * 2) / 3;
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table[3][2] = (int(table[0][2]) + int(table[1][2]) * 2) / 3;
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uint32_t block = src[4 + 8];
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block <<= 8;
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block |= src[5 + 8];
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block <<= 8;
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block |= src[6 + 8];
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block <<= 8;
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block |= src[7 + 8];
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int y = (j / (mm_w / 4)) * 4;
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int x = (j % (mm_w / 4)) * 4;
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int pixofs = (y * mm_w + x) * 4;
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for (int k = 0; k < 16; k++) {
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uint8_t alpha = ablock & 0x7;
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int idx = pixofs + ofs_table[k];
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dst[idx + 0] = table[block & 0x3][0];
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dst[idx + 1] = table[block & 0x3][1];
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dst[idx + 2] = table[block & 0x3][2];
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dst[idx + 3] = atable[alpha];
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block >>= 2;
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ablock >>= 3;
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}
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}
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rofs += len * 16;
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wofs += mm_w * mm_h * 4;
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mm_w /= 2;
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mm_h /= 2;
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} break;
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}
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}
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w = DVector<uint8_t>::Write();
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r = DVector<uint8_t>::Read();
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data = newdata;
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format = FORMAT_RGBA;
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if (wd != width || ht != height) {
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//todo, crop
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width = wd;
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height = ht;
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}
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return OK;
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}
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bool Image::operator==(const Image &p_image) const {
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if (data.size() == 0 && p_image.data.size() == 0)
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@ -1665,7 +1989,9 @@ Image Image::decompressed() const {
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Error Image::decompress() {
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if (format >= FORMAT_BC1 && format <= FORMAT_BC5 && _image_decompress_bc)
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_image_decompress_bc(this);
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_image_decompress_bc(this); // libsquish
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else if (format >= FORMAT_BC1 && format <= FORMAT_BC3)
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_decompress_bc(); // builtin
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else if (format >= FORMAT_PVRTC2 && format <= FORMAT_PVRTC4_ALPHA && _image_decompress_pvrtc)
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_image_decompress_pvrtc(this);
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else if (format == FORMAT_ETC && _image_decompress_etc)
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