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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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aa.text_bits should be 0 when using the 'any' or 'center' rasterizers.
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Don't mess with conditional compilation with LARGEFILE -- always expose
64-bit file offsets in our public API.
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Introduce an fz_overprint bitmap (currently just a uint32_t,
but it'll grow to be an array of them if FZ_MAX_COLOR is
increased). Pointers to this are passed into all our
painting routines.
NULL means "Do what you've always done before, with no overprint".
non NULL, means that every set bit means "don't ever alter this
component".
We therefore set the overprint bitmap up according to the input
color/colorspace/colorparams before calling each routine.
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We still use the fz_context versions as the default, but these
can be overridden with draw device options.
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This is intended to be a way to allow us to implement
compiletime/runtime selection of different scan converter
implementations.
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