roytam followup webp patch
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@ -364,11 +364,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
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VP8LMetadata* const hdr = &dec->hdr_;
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uint32_t* huffman_image = NULL;
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HTreeGroup* htree_groups = NULL;
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// When reading htrees, some might be unused, as the format allows it.
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// We will still read them but put them in this htree_group_bogus.
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HTreeGroup htree_group_bogus;
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HuffmanTables* huffman_tables = &hdr->huffman_tables_;
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HuffmanCode* next = NULL;
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int num_htree_groups = 1;
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int num_htree_groups_max = 1;
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int max_alphabet_size = 0;
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@ -453,59 +449,70 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
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}
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for (i = 0; i < num_htree_groups_max; ++i) {
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// If the index "i" is unused in the Huffman image, read the coefficients
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// but store them to a bogus htree_group.
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const int is_bogus = (mapping != NULL && mapping[i] == -1);
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HTreeGroup* const htree_group =
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is_bogus ? &htree_group_bogus :
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&htree_groups[(mapping == NULL) ? i : mapping[i]];
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HuffmanCode** const htrees = htree_group->htrees;
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int size;
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int total_size = 0;
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int is_trivial_literal = 1;
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int max_bits = 0;
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for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
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int alphabet_size = kAlphabetSize[j];
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if (j == 0 && color_cache_bits > 0) {
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alphabet_size += 1 << color_cache_bits;
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}
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size =
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ReadHuffmanCode(alphabet_size, dec, code_lengths, huffman_tables);
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htrees[j] = huffman_tables->curr_segment->curr_table;
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if (size == 0) {
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goto Error;
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}
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if (is_trivial_literal && kLiteralMap[j] == 1) {
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is_trivial_literal = (htrees[j]->bits == 0);
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}
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total_size += htrees[j]->bits;
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huffman_tables->curr_segment->curr_table += size;
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if (j <= ALPHA) {
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int local_max_bits = code_lengths[0];
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int k;
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for (k = 1; k < alphabet_size; ++k) {
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if (code_lengths[k] > local_max_bits) {
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local_max_bits = code_lengths[k];
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}
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// If the index "i" is unused in the Huffman image, just make sure the
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// coefficients are valid but do not store them.
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if (mapping != NULL && mapping[i] == -1) {
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for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
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int alphabet_size = kAlphabetSize[j];
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if (j == 0 && color_cache_bits > 0) {
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alphabet_size += (1 << color_cache_bits);
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}
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// Passing in NULL so that nothing gets filled.
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if (!ReadHuffmanCode(alphabet_size, dec, code_lengths, NULL)) {
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goto Error;
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}
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max_bits += local_max_bits;
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}
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}
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htree_group->is_trivial_literal = is_trivial_literal;
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htree_group->is_trivial_code = 0;
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if (is_trivial_literal) {
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const int red = htrees[RED][0].value;
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const int blue = htrees[BLUE][0].value;
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const int alpha = htrees[ALPHA][0].value;
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htree_group->literal_arb = ((uint32_t)alpha << 24) | (red << 16) | blue;
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if (total_size == 0 && htrees[GREEN][0].value < NUM_LITERAL_CODES) {
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htree_group->is_trivial_code = 1;
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htree_group->literal_arb |= htrees[GREEN][0].value << 8;
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} else {
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HTreeGroup* const htree_group =
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&htree_groups[(mapping == NULL) ? i : mapping[i]];
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HuffmanCode** const htrees = htree_group->htrees;
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int size;
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int total_size = 0;
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int is_trivial_literal = 1;
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int max_bits = 0;
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for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
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int alphabet_size = kAlphabetSize[j];
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if (j == 0 && color_cache_bits > 0) {
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alphabet_size += (1 << color_cache_bits);
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}
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size =
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ReadHuffmanCode(alphabet_size, dec, code_lengths, huffman_tables);
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htrees[j] = huffman_tables->curr_segment->curr_table;
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if (size == 0) {
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goto Error;
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}
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if (is_trivial_literal && kLiteralMap[j] == 1) {
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is_trivial_literal = (htrees[j]->bits == 0);
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}
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total_size += htrees[j]->bits;
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huffman_tables->curr_segment->curr_table += size;
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if (j <= ALPHA) {
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int local_max_bits = code_lengths[0];
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int k;
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for (k = 1; k < alphabet_size; ++k) {
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if (code_lengths[k] > local_max_bits) {
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local_max_bits = code_lengths[k];
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}
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}
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max_bits += local_max_bits;
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}
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}
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htree_group->is_trivial_literal = is_trivial_literal;
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htree_group->is_trivial_code = 0;
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if (is_trivial_literal) {
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const int red = htrees[RED][0].value;
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const int blue = htrees[BLUE][0].value;
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const int alpha = htrees[ALPHA][0].value;
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htree_group->literal_arb = ((uint32_t)alpha << 24) | (red << 16) | blue;
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if (total_size == 0 && htrees[GREEN][0].value < NUM_LITERAL_CODES) {
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htree_group->is_trivial_code = 1;
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htree_group->literal_arb |= htrees[GREEN][0].value << 8;
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}
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}
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htree_group->use_packed_table =
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!htree_group->is_trivial_code && (max_bits < HUFFMAN_PACKED_BITS);
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if (htree_group->use_packed_table) BuildPackedTable(htree_group);
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}
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htree_group->use_packed_table =
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!htree_group->is_trivial_code && (max_bits < HUFFMAN_PACKED_BITS);
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if (htree_group->use_packed_table) BuildPackedTable(htree_group);
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}
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ok = 1;
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@ -91,7 +91,8 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
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assert(code_lengths_size != 0);
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assert(code_lengths != NULL);
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assert(root_table != NULL);
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assert((root_table != NULL && sorted != NULL) ||
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(root_table == NULL && sorted == NULL));
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assert(root_bits > 0);
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// Build histogram of code lengths.
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@ -120,16 +121,22 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
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for (symbol = 0; symbol < code_lengths_size; ++symbol) {
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const int symbol_code_length = code_lengths[symbol];
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if (code_lengths[symbol] > 0) {
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sorted[offset[symbol_code_length]++] = symbol;
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if (sorted != NULL) {
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sorted[offset[symbol_code_length]++] = symbol;
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} else {
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offset[symbol_code_length]++;
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}
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}
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}
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// Special case code with only one value.
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if (offset[MAX_ALLOWED_CODE_LENGTH] == 1) {
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HuffmanCode code;
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code.bits = 0;
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code.value = (uint16_t)sorted[0];
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ReplicateValue(table, 1, total_size, code);
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if (sorted != NULL) {
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HuffmanCode code;
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code.bits = 0;
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code.value = (uint16_t)sorted[0];
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ReplicateValue(table, 1, total_size, code);
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}
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return total_size;
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}
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@ -151,6 +158,7 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
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if (num_open < 0) {
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return 0;
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}
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if (root_table == NULL) continue;
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for (; count[len] > 0; --count[len]) {
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HuffmanCode code;
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code.bits = (uint8_t)len;
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