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Several things irk me about passing values as const pointers:
* They can be NULL, which is not a valid value.
* They require explicit temporary variables for storage.
* They don't compose easily in a legible manner, requiring
weird pointer passing semantics where the variable being assigned
is hidden as an argument in the innermost function call.
* We can't change the value through the pointer, requiring yet more
local variables to hold copies of the input value.
In the device interface where we pass a matrix to a function, we often
find ourselves making a local copy of the matrix so we can concatenate
other transforms to it. This copying is a lot of unnecessary busywork
that I hope to eventually avoid by laying the groundwork with this
commit.
This is a rather large API change, so I apologize for the inconvenience,
but I hope the end result and gain in legibility will be worth the pain.
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The "blend back" at the end of the inner knockout groups was
attempting to reuse the existing blending code. This was going
wrong for all sorts of reasons (not least the uncomposition
phase) for knockout groups containing alpha, such as found on
page 7 of Altona_Technical_v20_x4.pdf.
Use a dedicated routine. This is much simpler as it doesn't have
to cope with blend modes etc.
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Proper blending of spots is dependent upon the blending
color space as well as the blend mode. In particular
when the blend mode is non-separable or non-white preserving
normal blending should be used for the spot colorants.
Incorporates various fixes and optimisations squashed back
to this one commit for clarity. Some of these fixes/optimisations
are due to Michael Vrhel.
In particular we move to handling non-isolated groups in the same
way as gs.
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(Incorporates fixes from Tor, Michael and Robin).
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Also make sure to support the cases where the background
alpha is 0 for non-isolated groups.
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Softlight blend mode was broken as the constants were not properly scaled
for 255 arithmetic. The nonseparable blending code needs to do special
handling of K when the color space is CMYK.
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Use do {} while(--w) rather than while(w--) {} as this safes a
test each time around the loop.
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Try and help C avoid pointer aliasing issues. Some of this may not
help at all. None of it should hurt though.
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fz_pixmaps now have an explicit stride value. By default no change
from before, but code all copes with extra gaps at the end of the
line.
The alpha data in fz_pixmaps is no longer compulsory.
mudraw: use rgb not rgba (ppmraw), cmyk not cmyka (pkmraw).
Update halftone code to not expect alpha plane.
Update PNG writing to cope with alpha less input.
Also hide repeated params within the png output context.
ARM code needs updating.
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If b is out of range (-ve), then this can let s == 0 and we can get
failures.
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Update buffer and filter processors.
Filter both colors and stroke states.
Move OCG hiding logic into interpreter.
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