248 lines
7.4 KiB
C++
248 lines
7.4 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2011-2020 Arm Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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// ----------------------------------------------------------------------------
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/**
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* @brief Functions for converting between symbolic and physical encodings.
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*/
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#include "astc_codec_internals.h"
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// routine to read up to 8 bits
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static inline int read_bits(
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int bitcount,
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int bitoffset,
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const uint8_t* ptr
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) {
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int mask = (1 << bitcount) - 1;
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ptr += bitoffset >> 3;
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bitoffset &= 7;
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int value = ptr[0] | (ptr[1] << 8);
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value >>= bitoffset;
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value &= mask;
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return value;
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}
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static inline int bitrev8(int p)
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{
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p = ((p & 0xF) << 4) | ((p >> 4) & 0xF);
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p = ((p & 0x33) << 2) | ((p >> 2) & 0x33);
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p = ((p & 0x55) << 1) | ((p >> 1) & 0x55);
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return p;
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}
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void physical_to_symbolic(
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const block_size_descriptor* bsd,
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physical_compressed_block pb,
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symbolic_compressed_block* res
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) {
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uint8_t bswapped[16];
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int i, j;
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res->error_block = 0;
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// get hold of the decimation tables.
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const decimation_table *const *ixtab2 = bsd->decimation_tables;
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// extract header fields
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int block_mode = read_bits(11, 0, pb.data);
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if ((block_mode & 0x1FF) == 0x1FC)
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{
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// void-extent block!
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// check what format the data has
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if (block_mode & 0x200)
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res->block_mode = -1; // floating-point
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else
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res->block_mode = -2; // unorm16.
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res->partition_count = 0;
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for (i = 0; i < 4; i++)
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{
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res->constant_color[i] = pb.data[2 * i + 8] | (pb.data[2 * i + 9] << 8);
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}
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// additionally, check that the void-extent
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if (bsd->zdim == 1)
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{
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// 2D void-extent
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int rsvbits = read_bits(2, 10, pb.data);
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if (rsvbits != 3)
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res->error_block = 1;
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int vx_low_s = read_bits(8, 12, pb.data) | (read_bits(5, 12 + 8, pb.data) << 8);
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int vx_high_s = read_bits(8, 25, pb.data) | (read_bits(5, 25 + 8, pb.data) << 8);
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int vx_low_t = read_bits(8, 38, pb.data) | (read_bits(5, 38 + 8, pb.data) << 8);
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int vx_high_t = read_bits(8, 51, pb.data) | (read_bits(5, 51 + 8, pb.data) << 8);
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int all_ones = vx_low_s == 0x1FFF && vx_high_s == 0x1FFF && vx_low_t == 0x1FFF && vx_high_t == 0x1FFF;
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if ((vx_low_s >= vx_high_s || vx_low_t >= vx_high_t) && !all_ones)
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res->error_block = 1;
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}
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else
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{
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// 3D void-extent
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int vx_low_s = read_bits(9, 10, pb.data);
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int vx_high_s = read_bits(9, 19, pb.data);
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int vx_low_t = read_bits(9, 28, pb.data);
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int vx_high_t = read_bits(9, 37, pb.data);
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int vx_low_p = read_bits(9, 46, pb.data);
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int vx_high_p = read_bits(9, 55, pb.data);
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int all_ones = vx_low_s == 0x1FF && vx_high_s == 0x1FF && vx_low_t == 0x1FF && vx_high_t == 0x1FF && vx_low_p == 0x1FF && vx_high_p == 0x1FF;
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if ((vx_low_s >= vx_high_s || vx_low_t >= vx_high_t || vx_low_p >= vx_high_p) && !all_ones)
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res->error_block = 1;
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}
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return;
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}
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if (bsd->block_modes[block_mode].permit_decode == 0)
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{
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res->error_block = 1;
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return;
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}
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int weight_count = ixtab2[bsd->block_modes[block_mode].decimation_mode]->num_weights;
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int weight_quantization_method = bsd->block_modes[block_mode].quantization_mode;
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int is_dual_plane = bsd->block_modes[block_mode].is_dual_plane;
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int real_weight_count = is_dual_plane ? 2 * weight_count : weight_count;
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int partition_count = read_bits(2, 11, pb.data) + 1;
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res->block_mode = block_mode;
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res->partition_count = partition_count;
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for (i = 0; i < 16; i++)
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bswapped[i] = bitrev8(pb.data[15 - i]);
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int bits_for_weights = compute_ise_bitcount(real_weight_count,
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(quantization_method) weight_quantization_method);
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int below_weights_pos = 128 - bits_for_weights;
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if (is_dual_plane)
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{
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uint8_t indices[64];
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decode_ise(weight_quantization_method, real_weight_count, bswapped, indices, 0);
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for (i = 0; i < weight_count; i++)
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{
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res->plane1_weights[i] = indices[2 * i];
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res->plane2_weights[i] = indices[2 * i + 1];
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}
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}
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else
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{
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decode_ise(weight_quantization_method, weight_count, bswapped, res->plane1_weights, 0);
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}
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if (is_dual_plane && partition_count == 4)
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res->error_block = 1;
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res->color_formats_matched = 0;
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// then, determine the format of each endpoint pair
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int color_formats[4];
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int encoded_type_highpart_size = 0;
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if (partition_count == 1)
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{
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color_formats[0] = read_bits(4, 13, pb.data);
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res->partition_index = 0;
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}
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else
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{
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encoded_type_highpart_size = (3 * partition_count) - 4;
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below_weights_pos -= encoded_type_highpart_size;
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int encoded_type = read_bits(6, 13 + PARTITION_BITS, pb.data) | (read_bits(encoded_type_highpart_size, below_weights_pos, pb.data) << 6);
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int baseclass = encoded_type & 0x3;
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if (baseclass == 0)
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{
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for (i = 0; i < partition_count; i++)
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{
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color_formats[i] = (encoded_type >> 2) & 0xF;
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}
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below_weights_pos += encoded_type_highpart_size;
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res->color_formats_matched = 1;
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encoded_type_highpart_size = 0;
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}
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else
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{
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int bitpos = 2;
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baseclass--;
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for (i = 0; i < partition_count; i++)
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{
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color_formats[i] = (((encoded_type >> bitpos) & 1) + baseclass) << 2;
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bitpos++;
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}
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for (i = 0; i < partition_count; i++)
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{
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color_formats[i] |= (encoded_type >> bitpos) & 3;
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bitpos += 2;
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}
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}
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res->partition_index = read_bits(6, 13, pb.data) | (read_bits(PARTITION_BITS - 6, 19, pb.data) << 6);
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}
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for (i = 0; i < partition_count; i++)
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res->color_formats[i] = color_formats[i];
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// then, determine the number of integers we need to unpack for the endpoint pairs
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int color_integer_count = 0;
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for (i = 0; i < partition_count; i++)
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{
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int endpoint_class = color_formats[i] >> 2;
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color_integer_count += (endpoint_class + 1) * 2;
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}
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if (color_integer_count > 18)
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res->error_block = 1;
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// then, determine the color endpoint format to use for these integers
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static const int color_bits_arr[5] = { -1, 115 - 4, 113 - 4 - PARTITION_BITS, 113 - 4 - PARTITION_BITS, 113 - 4 - PARTITION_BITS };
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int color_bits = color_bits_arr[partition_count] - bits_for_weights - encoded_type_highpart_size;
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if (is_dual_plane)
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color_bits -= 2;
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if (color_bits < 0)
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color_bits = 0;
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int color_quantization_level = quantization_mode_table[color_integer_count >> 1][color_bits];
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res->color_quantization_level = color_quantization_level;
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if (color_quantization_level < 4)
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res->error_block = 1;
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// then unpack the integer-bits
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uint8_t values_to_decode[32];
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decode_ise(color_quantization_level, color_integer_count, pb.data, values_to_decode, (partition_count == 1 ? 17 : 19 + PARTITION_BITS));
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// and distribute them over the endpoint types
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int valuecount_to_decode = 0;
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for (i = 0; i < partition_count; i++)
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{
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int vals = 2 * (color_formats[i] >> 2) + 2;
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for (j = 0; j < vals; j++)
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res->color_values[i][j] = values_to_decode[j + valuecount_to_decode];
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valuecount_to_decode += vals;
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}
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// get hold of color component for second-plane in the case of dual plane of weights.
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if (is_dual_plane)
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res->plane2_color_component = read_bits(2, below_weights_pos - 2, pb.data);
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}
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