Issue 140065: Alternate alpha blending path

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Issue 140065: Alternate alpha blending path

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Created:
16 years, 2 months ago by Stephen White

Modified:
16 years, 2 months ago

Reviewers:
reed

Base URL:
http://skia.googlecode.com/svn/trunk/

Visibility:
Public.

Description

This patch implements alpha blending using SkDiv255Round(), which gives numerically exact values of (a / 255) (for values in the range 0..65025). This makes Skia's compositing operators match CG's results pixel for pixel, at a performance cost of a few more integer operations per pixel. For now, these changes are hidden behind #ifdef SK_USE_ACCURATE_BLENDING.

Patch Set 1 #

Patch Set 2 : Hide some more code behind #ifdefs #

Created: 16 years, 2 months ago

Download [raw] [tar.bz2]

Unified diffs	Side-by-side diffs	Delta from patch set	Stats (+38 lines, -7 lines)			Patch
include/core/SkColorPriv.h	View		3 chunks	+22 lines, -3 lines	0 comments	Download
src/core/SkBlitRow_D32.cpp	View	1	2 chunks	+8 lines, -0 lines	0 comments	Download
src/core/SkBlitter_ARGB32.cpp	View	1	1 chunk	+4 lines, -0 lines	0 comments	Download
src/core/SkScan_Antihair.cpp	View		3 chunks	+3 lines, -3 lines	0 comments	Download
src/core/SkXfermode.cpp	View		1 chunk	+1 line, -1 line	0 comments	Download

Messages

Total messages: 4

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reed

16 years, 2 months ago (2009-10-30 19:13:48 UTC) #4

On 2009/10/27 03:04:50, Stephen White wrote:
> Hide some more code behind #ifdefs

Lets talk more about these as a design discussion before narrowly having a
code-review.

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