Reverse the effects of png_do_shift. This routine merely shifts the * pixels back to their significant bits values. Thus, if you have * a row of b

Pick out the correct pixels for the interlace pass. * The basic idea here is to go through the row with a source * pointer and a destination pointer

Undoes intrapixel differencing */

Transform the data according to the user's wishes. The order of * transformations is significant. */

This function returns a pointer to the error_ptr associated with the user * functions. The application should free any memory associated with this

Initialize everything needed for the read. This includes modifying * the palette. */

What we do with the incoming data depends on what we were previously * doing before we ran out of data... */

This function is called when we haven't found a handler for this * chunk. If there isn't a problem with the chunk itself (ie a bad chunk * name or

Read any remaining signature bytes from the stream and compare them with * the correct PNG signature. It is possible that this routine is called *

Free all memory used by the read (old method) */

Modify the info structure to reflect the transformations. The * info should be updated so a PNG file could be written with it, * assuming the trans

Optional call to update the users info_ptr structure */

Expand paletted images to RGB, expand grayscale images of * less than 8-bit depth to 8-bit depth, and expand tRNS chunks * to alpha channels. */

GRR 970116 */

Strip 16 bit depth files to 8 bit depth */

Write an IEND chunk */

Write the IHDR chunk, and update the png_struct with the necessary * information. Note that the rest of this code depends upon this * information b

Write the palette. We are careful not to trust png_color to be in the * correct order for PNG, so people can redefine it to any convenient * struct

Write the background chunk */

Free any memory used in png_ptr struct (old method) */

Do the actual writing of a previously filtered row. */

Flush the current output buffers now */

Write the histogram */

Write an iCCP chunk */

Writes all the PNG information. This is the suggested way to use the * library. If you have a new chunk to add, make a function to write it, * and

Write the oFFs chunk */

Write the pCAL chunk (described in the PNG extensions document) */

Write the pHYs chunk */

Write a few rows of image data. If the image is interlaced, * either you will have to write the 7 sub images, or, if you * have called png_set_inte

Write the sBIT chunk */

Write a sPLT chunk */

Write a sRGB chunk */

Simple function to write the signature. If we have already written * the magic bytes of the signature, or more likely, the PNG stream is * being em

Initializes the row writing capability of libpng */

Write the tRNS chunk */

This function is called when there is a warning, but the library thinks * it can continue anyway. Replacement functions don't have to do anything *