https://bugs.freedesktop.org/show_bug.cgi?id=64717
Priority: medium
Bug ID: 64717
Assignee: [email protected]
Summary: When registering the png file with alpha information
to the toolbar, it was discolored.
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: Other
Status: UNCONFIRMED
Version: 3.6.6.2 release
Component: Spreadsheet
Product: LibreOffice
LibreOffice 4.0.3/3.6.6/3.5.7 calc/write
ubuntu 12.04 32bit
This problem occurs by Linux.
It does not occur in Windows.
The size of the following picture is 16*16 pixels.
http://www.ne.jp/asahi/soft/miday/Calc_Moji/pngdata.zip
256tr.png True color with alpha information A background is transparent.
256wh.png True color A background is white.
8tr.png Index color A background is transparent.
8wh.png Index color A background is white.
By Calc/Write, the following operations are carried out and it registers as an
icon of a toolbar.
menu View -> Toolbars -> Customize ->
Toolbars -> Commands -> Modify -> Change Icon ->
Import
Pictures other than 256tr.png are satisfactory.
256tr.png will become white.
http://www.ne.jp/asahi/soft/miday/Calc_Moji/errorIcon.png
The alpha information on the original range of 16*16 is not right.
At 256tr.png, one pixel is "RGBA" and is 32 bits.
"A" is alpha information and is 0 - 255.
0 is un-transparent.
255 is transparent.
This alpha information is reversed in 16*16.
For example, in LO3.5, if the following line is changed, it will be repaired.
File
vcl/source/gdi/outdev2.cxx
Method
OutputDevice::ImplBlendWithAlpha
Original
pAlphaW->SetPixel( nY, nX, Color(255L-nResAlpha, 255L-nResAlpha,
255L-nResAlpha) );
After correction
pAlphaW->SetPixel( nY, nX, Color(nResAlpha, nResAlpha, nResAlpha)
);
nY and nX are 0 - 15.
But since it thinks that Windows will be influenced if this is corrected, I
think that it is not right.
I am not investigating any source other than LO3.5.
I am not investigating the source of Windows/Mac, either.
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
Libreoffice-bugs mailing list
[email protected]
http://lists.freedesktop.org/mailman/listinfo/libreoffice-bugs
