Warnings to errors in imageaffinematrix*()

Warnings to errors in imagecrop(auto)

Warnings to errors imageconvolution

Warnings become errors for imagepolygon et al

Negative checks for gamma

Warnings for image colour range check now throw exceptions

Warnings to errors for imagecreatefromgd2part

We also delete tests which were duplicates of a completely unrelated
test.

Warnings to Errors imagetruecolortopalette

Warnings to Errors imagecreate(truecolor)

We also add a test helper which we will be using for other GD functions
as well.

Don't explicitly set return value on ZPP/ZFR failure

Failing `zend_parse_parameters()` and `zend_fetch_resource()` throw as
of PHP 8.0.0, so explicitly setting a return value is useless,

Don't explicitly set return value on ZPP/ZFR failure

Failing `zend_parse_parameters()` and `zend_fetch_resource()` throw as
of PHP 8.0.0, so explicitly setting a return value is useless, and also
slightly confusing.

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Remove some misleading RETURN_FALSE

These functions throw, so they can't return false.

This is just a subset...

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix parameter order

Fix parameter order

`imagecopymerge()` and `imagecopymergegray()` expect the destination
image first, not the other way round.

Merge branch 'PHP-7.4'

* PHP-7.4:
Extend color component range checks

Extend color component range checks

We also check for alpha components to be within range, and we add yet
missing range checks for other functions as well.

Add GD function stubs

Merge branch 'PHP-7.4'

Report errors from stream read and write operations

The php_stream_read() and php_stream_write() functions now return
an ssize_t value, with negative results indicating failure. Function

Report errors from stream read and write operations

The php_stream_read() and php_stream_write() functions now return
an ssize_t value, with negative results indicating failure. Functions
like fread() and fwrite() will return false in that case.

As a special case, EWOULDBLOCK and EAGAIN on non-blocking streams
should not be regarded as error conditions, and be reported as
successful zero-length reads/writes instead. The handling of EINTR
remains unclear and is internally inconsistent (e.g. some code-paths
will automatically retry on EINTR, while some won't).

I'm landing this now to make sure the stream wrapper ops API changes
make it into 7.4 -- however, if the user-facing changes turn out to
be problematic we have the option of clamping negative returns to
zero in php_stream_read() and php_stream_write() to restore the
old behavior in a relatively non-intrusive manner.

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Merge branch 'PHP-7.4'

* PHP-7.4:
cleanup gd build with system libgd - drop need to use libpng with system libgd - drop need to use libjpeg with system libgd - drop need to use libXpm

Merge branch 'PHP-7.4'

* PHP-7.4:
cleanup gd build with system libgd - drop need to use libpng with system libgd - drop need to use libjpeg with system libgd - drop need to use libXpm with system libgd - drop need to use libfreetype with system libgd - improve configure comments

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cleanup gd build with system libgd - drop need to use libpng with system libgd - drop need to use libjpeg with system libgd - drop need to use libXpm with system libgd - drop need to use libfreetype

cleanup gd build with system libgd - drop need to use libpng with system libgd - drop need to use libjpeg with system libgd - drop need to use libXpm with system libgd - drop need to use libfreetype with system libgd - improve configure comments

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Merge branch 'PHP-7.4'

* PHP-7.4:
Drop superfluous ENABLE_GD_TTF

Drop superfluous ENABLE_GD_TTF

If we `HAVE_LIBFREETYPE`, we define `ENABLE_GD_TTF` if it is not
defined. Therefore we can check for `HAVE_LIBFREETYPE` in the first
place.

Merge branch 'PHP-7.4'

Use ZEND_HASH_FOREACH APIs in a few more places

Merge branch 'PHP-7.4'

* PHP-7.4:
Properly shut down font cache mutex