From 26e6c73aab3fbfb4e2c893b4064cd8e85dc25346 Mon Sep 17 00:00:00 2001 From: Carl Worth Date: Sat, 20 Jan 2007 02:58:15 -0800 Subject: [PATCH] NEWS: Add notes for 1.3.12 snapshot --- NEWS | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) diff --git a/NEWS b/NEWS index 29efdb45d..b373fe6ae 100644 --- a/NEWS +++ b/NEWS @@ -1,3 +1,96 @@ +Snapshot 1.3.12 (2007-01-20 Carl Worth ) +=========================================================== +The relentless march toward the cairo 1.4 release continues, (even if +slightly late out of the starting blocks in 2007). This is the sixth +development snapshot in the 1.3 series. It comes 4 weeks after the +1.3.10 snapshot. + +Performance +----------- +As usual, this snapshot has some fun performance improvements to show +off: + +image-rgba long-lines-uncropped-100 470.08 -> 4.95: 94.91x speedup +███████████████████████████████████████████████ +image-rgb long-lines-uncropped-100 461.60 -> 4.96: 93.02x speedup +██████████████████████████████████████████████ + +This 100x improvement, (and yes, that's 100x, not 100%), in the image +backend occurs when drawing large shapes where only a fraction of the +shape actually appears in the final result, (the rest being outside +the bounds of the destination surface). Many applications should see +speedups here, and the actual amount of speedup depends on the ratio +of non-visible to visible portions of geometry. + +[Note: There remains a similar performance bug when drawing mostly +non-visible objects with the xlib backend. This is due to a similar +bug in the X server itself, but we hope a future cairo snapshot will +workaround that bug to get a similar speedup with the xlib backend.] + +image-rgba unaligned_clip-100 0.09 -> 0.06: 1.67x speedup +▍ +image-rgb unaligned_clip-100 0.09 -> 0.06: 1.66x speedup +▍ + +This speedup is due to further MMX optimization by Soeren Sandmann for +a case commonly hit when rendering PDF files, (and thanks to Jeff +Muizelaar for writing code to extract the test case for us). + +There's another MMX optimization in this snapshot (without a fancy +speedup chart) by Dan Williams which improves compositing performance +specifically for the OLPC machine. + +Thanks to Adrian Johnson, cairo's PDF output is now much more +efficient in the way it encodes text output. By reducing redundant +information and adding compression to text output streams, Adrian +achieved a ~25x improvement in the efficiency of encoding text in PDF +files, (was ~45 bytes per glyph and is now ~1.6 bytes per glyph). + +Bug fixes +--------- +In addition to those performance improvements, this snapshot includes +several bug fixes: + + * A huge number of bug fixes for cairo-atsui text rendering, (for mac + OS X). These bugs affect font selection, glyph positioning, glyph + rendering, etc. One noteworthy bug fixes is that + cairo_select_font_face will no longer arbitrarily select bold nor + italic when not requested, (at least not when using a standard CSS2 + font family name such as "serif", "sans-serif", "monospace", etc.). + All these fixes are thanks to Brian Ewins who continues to do a + great job as the new cairo-atsui maintainer. + + * Fix PDF output so that images that are scaled down no longer + mysteriously repeat (Carl Worth). + + * Fix segfault on Mac OS X dues to attempt to measure extents of a + zero-length string (Behdad Esfahbod). + + * Fix text extents to not include the size of initial/trailing + non-inked characters (Behdad Esfahbod). + +API tweaks +---------- +Three functions have had API changes to improve consistency. Note that +the API functions being changed here are all functions that were +introduced as new functions during these 1.3.x snapshots. As always, +there will not be any API changes to functions included in a major +release (1.2.x, 1.4.x, etc.) of cairo. + +The changes are as follows: + + * Rename of cairo_copy_clip_rectangles to cairo_copy_clip_rectangle_list. + + * Change cairo_get_dash_count to return an int rather than accepting a + pointer to an int for the return value. + + * Change cairo_get_dash to have a void return type rather than + returning cairo_status_t. + +It's possible there will be one more round of changes to these +functions, (and perhaps cairo_get_color_stop as well), as we seek to +establish a unifying convention for returning lists of values. + Snapshot 1.3.10 (2006-12-23 Carl Worth ) =========================================================== Santa Claus is coming just a little bit early this year, and he's