Prediction used for interpolation / alpha=0 pixels. Does not have to be the same as the guess used for encoding/decoding.

clean up the temporary component buffers

combined JPEG 'receive' and JPEG 'extend', since baseline always extends everything it receives.

returns 0..31 for the highest set bit

initialize a memory-decode context

initialize a callback-based context

swap endianess

Create the Huffman tree given the symbol frequencies*/

return type is a LodePNG error code*/

Renders the image or current animation frame (assuming it is available as a SDL_Texture)

return the predictor that has the smallest total difference

Make value (which is a difference from prediction) lossy by rounding small values to zero and (for larger values) by setting least significant mantiss

Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/

returns the code, or (unsigned)(-1) if error happened inbitlength is the length of the complete buffer, in bits (so its byte length times 8) */

Return the CRC of the bytes buf[0..len-1].*/

buffer must have at least 4 allocated bytes available*/

auxiliary function to read a non-zero number from a PNM header, ignoring whitespace and comments

you can both convert from vector to buffer&size and vica versa. If you use init_buffer to take over a buffer and size, it is not needed to use cleanup