[libGD] #233 [Task opened] bug in gdImageCreateFromPngCtx, don't process alpha channel

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A new Flyspray task has been opened.  Details are below. 

User who did this - tzzhwj (tzzhwj) 

Attached to Project - libGD
Summary - bug in gdImageCreateFromPngCtx, don't process alpha channel
Task Type - Bug Report
Category - Image Import/Export
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Normal
Reported Version - 2.0.35
Due in Version - Undecided
Due Date - Undecided
Details -   There is a bug about gdImageCreateFromPngCtx in file gd_png.c. There is lack of "im->saveAlphaFlag = 1" at "case: PNG_COLOR_TYPE_RGB_ALPHA" in file gd_png.c line 300.
  
  This bug make a terrible situation. I read a png image to gdImagePtr, and then write gdImagePtr to anthor file, however, the two file is different. The reason is the alpha channel haven't been processed

More information can be found at the following URL:
http://bugs.libgd.org/?do=details&task_id=233

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