URL:
<http://savannah.gnu.org/patch/?8781>
Summary: [back] Faster bitmap drawing on Cairo
Project: GNUstep
Submitted by: tedge
Submitted on: Sun 25 Oct 2015 12:13:30 AM GMT
Category: AppKit
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
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Details:
The attached patch speeds up -[CairoGState DPSimage:::::::::::] &
-[CairoGState GSReadRect:] for faster bitmap drawing to & from graphics
contexts. This makes PikoPixel's interactive tools more responsive on slow
hardware, such as a Raspberry Pi.
- Bitmap data is reformatted using uint32s instead of uchars, reducing the
number of memory operations
- Invariant objects returned in GSReadRect:'s dictionary are stored in a
static dictionary instead of being reallocated each time
A speed check program is also attached; On a Raspberry Pi 2B with the current
trunk, the {512,512}x500 speed checks take ~11 seconds for drawing & reading.
Using the patch, the speed checks take ~8 seconds for drawing (~27% speedup) &
~10 seconds for reading (~9% speedup).
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File Attachments:
-------------------------------------------------------
Date: Sun 25 Oct 2015 12:13:30 AM GMT Name: CairoGState_BitmapSpeedup.patch
Size: 8kB By: tedge
<http://savannah.gnu.org/patch/download.php?file_id=35281>
-------------------------------------------------------
Date: Sun 25 Oct 2015 12:13:30 AM GMT Name: TestBitmapDrawSpeed.m Size: 4kB
By: tedge
<http://savannah.gnu.org/patch/download.php?file_id=35282>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/patch/?8781>
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