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c176fc94fe
Currently we don't implement transparency at all in BMP images except for an
odd-duck case of BMPs within ICOs.
This patch does the following.
- It implements transparency properly for 16bpp and 32bpp images via bitfield
masking. (For 32bpp images this also requires handling colors via bitfield
masking.) The patch maintains the existing BMP-within-ICO transparency
handling.
- It also reworks BitFields::Value::Set().
* It now works correctly if the run of 1s goes all the way to bit 31 (the
old code didn't set mBitWidth).
* If the mask is 0, will give an mRightShift of 0 (old code gave 32, and
right-shifting by 32 is dodgy).
* It's now easier to read.
- It renames transparent.bmp as transparent-if-within-ico.bmp. Ironically
enough this file currently uses BITFIELDS compression and is WinBMPv5 format,
which means it contains well-specified alpha data. In order to use it to test
the hacky BMP-within-ICO transparency scheme the patch changes it to be
WinBMPv3 format with RGB compression (i.e. no compression). I left the
now-excess bytes (including the bitfields) in the info header in place
because that's allowed -- thanks to the start of the pixel data being
specified by the |dataoffset| field -- they'll just be ignored.
- It tweaks the naming of the relevant gtests and some of their finer details
to work with the new way of doing things.
This fixes all four remaining failures in bmpsuite.
|
||
|---|---|---|
| .. | ||
| apng | ||
| blob | ||
| bmp | ||
| color-management | ||
| downscaling | ||
| encoders-lossless | ||
| generic | ||
| gif | ||
| ico | ||
| jpeg | ||
| pngsuite-ancillary | ||
| pngsuite-background | ||
| pngsuite-basic-i | ||
| pngsuite-basic-n | ||
| pngsuite-chunkorder | ||
| pngsuite-corrupted | ||
| pngsuite-filtering | ||
| pngsuite-gamma | ||
| pngsuite-oddsizes | ||
| pngsuite-palettes | ||
| pngsuite-transparency | ||
| pngsuite-zlib | ||
| colordepth.html | ||
| ImageDocument.css | ||
| img2html.html | ||
| reftest.list | ||