angie: changes by commit

branch to review (2009-08-04 to 2009-08-10) v212

• Added conditional use (USE_PNG) of external library libpng (http://libpng.org/pub/png/, sourceforge) to write memgfx images in the PNG format instead of GIF. Currently used (conditionally!) only for hgTracks' main image. This is to support Tim's enhancements for horizontal scrolling of the browser track image. Image file size also appears smaller than GIF but should try more test cases.
  • src/hg/hgTracks/hgTracks.c 1.1586 - lines changed: 5, context: html, text, full: html, text
  • src/hg/inc/hvGfx.h 1.4 - lines changed: 3, context: html, text, full: html, text
  • src/hg/lib/hvGfx.c 1.4 - lines changed: 8, context: html, text, full: html, text
  • src/inc/common.mk 1.67 - lines changed: 13, context: html, text, full: html, text
  • src/inc/memgfx.h 1.25 - lines changed: 13, context: html, text, full: html, text
  • src/inc/vGfx.h 1.14 - lines changed: 6, context: html, text, full: html, text
  • src/lib/makefile 1.154 - lines changed: 2, context: html, text, full: html, text
  • src/lib/pngwrite.c 1.1 - lines changed: 114, context: html, text, full: html, text
  • src/lib/vPng.c 1.1 - lines changed: 65, context: html, text, full: html, text