extract an arbitrarily-aligned N-bit value (N=bits) from v, and then make it 8-bits long and fractionally extend it to full full range.

returns STBI_rgb or whatever, 0 on error

This is the maximum number of input samples that can affect an output sample with the given filter

calculate the new length of the string in a printbuffer and update the offset */

Creates a chunk from given 'data' and sets it as 1st chunk in 'chunk_list'.

Add a frame to the end of the list, ensuring the last frame is complete. Returns true on success, false otherwise.

Allocates the memory for argb (W x H) buffer, 2 rows of context for prediction and transform data. Flags influencing the memory allocated: enc->transf

Allocates the memory for argb (W x H) buffer, 2 rows of context for prediction and transform data. Flags influencing the memory allocated: enc->transf

Swaps the content of two VP8LBackwardRefs.

Blend a single channel of 'src' over 'dst', given their alpha channel values. 'src' and 'dst' are assumed to be NOT pre-multiplied by alpha.

sorted[code_lengths_size] is a pre-allocated array for sorting symbols by code length.

main thread state control

main thread state control

Returns true if alpha[] has non-0xff values.

Returns the average quantizer

Returns the average quantizer

Finalize the Huffman cost based on streak numbers and length type (<3 or >=3)

Returns the exact index where array1 and array2 are different. For an index inferior or equal to best_len_match, the return value just has to be stric

Pop a specific pair in the queue by replacing it with the last one and shrinking the queue.

Create a pair from indices "idx1" and "idx2" provided its cost is inferior to "threshold", a negative entropy. It returns the cost of the pair, or 0.