Computes the cyclic redundancy check as used by PNG chunks*/

Get bits without advancing the bit pointer. Must have enough bits available with ensureBits. Max nbits is 31. */

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returns 1 if success, 0 if failure ==> nothing done*/

returns 1 if success, 0 if failure ==> nothing done*/

returns 1 if success, 0 if failure ==> nothing done*/

align and scale view

函数功能：获取EtherCAT总线上从设备的状态信息*/

Second step for the ...makeFromLengths and ...makeFromFrequencies functions. numcodes, lengths and maxbitlen must already be filled in correctly. retu

------------------------- Tell the render thread to load a file and wait -------------------------

make control section of UI

make joint section of UI

render the ui to the window

only adds the chunk if needed (there is a key or palette with alpha) */

index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to*/

Return the adler32 of the bytes data[0..len-1]*/

returns -1 if color not present, its index otherwise*/

LZ77-encode the data. Return value is error code. The input are raw bytes, the output is in the form of unsigned integers with codes representing for

See ensureBits documentation above. This one ensures up to 25 bits */

See ensureBits documentation above. This one ensures up to 32 bits */

See ensureBits documentation above. This one ensures up to 9 bits */

get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/

get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/

return the path to the directory containing the current executable used to determine the location of auto-loaded plugin libraries

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same as set but does not delete */

load file into buffer that already has the correct allocated size. Returns error code.*/

allocates palette memory if needed, and initializes all colors to black*/

stats must already have been inited. */

Converts a single rgb color without alpha from one type to another, color bits truncated to their bitdepth. In case of single channel (gray or palette

returns negative value on error. This should be pure C compatible, so no fstat. */

write given buffer to the file, overwriting the file, it doesn't append to it.*/

out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image. return value is error**/

background color chunk (bKGD)*/

international text chunk (iTXt)*/

significant bits chunk (sBIT)*/