========================================================================= */

Compute the dot product between the two vectors a and b.

=========================================================================== * Fill the window when the lookahead becomes insufficient. * Updates str

Calculate the CRC over a section of data. We can only pass as * much data to this routine as the largest single buffer size. We * also check that

Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, * and if invalid, correct the keyword rather than discarding the entire * ch

Free all memory used by the write. * In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for * *png_ptr_ptr. Prior to 1.6.0 i

The inverse of the above. */

Handle alpha and tRNS via a background color */

Checks whether the supplied bytes match the PNG signature. We allow * checking less than the full 8-byte signature so that those apps that * alread

Called by user to write a row of image data */