Fix: Memory leak in ICUParagraphLayout::NextLine() (#11895)

This function calls icu::BreakIterator::createLineInstance() but does not clean up after it.

Instead use a static instance that is cloned (for thread-safety) and deleted as necessary.

Fix #11827: Make Layouter::GetCharPosition() aware of ligatures. (#11831)

When ligatures happen the precise individual character position is not known, so instead return the previous position (which is that of the ligature.)

Codechange: Store text run positions in vector of points.

This simplifies the interlaced vector of x/y positions.

Codechange: automatic adding of _t to (u)int types, and WChar to char32_t

for i in `find src -type f|grep -v 3rdparty/fmt|grep -v 3rdparty/catch2|grep -v 3rdparty/opengl|grep -v stdafx.h`; do sed 's/uint16& /uint16 \&/g;s/int8\([ >*),;[]\)/int8_t\1/g;s/int16\([ >*),;[]\)/int16_t\1/g;s/int32\([ >*),;[]\)/int32_t\1/g;s/int64\([ >*),;[]\)/int64_t\1/g;s/ uint32(/ uint32_t(/g;s/_uint8_t/_uint8/;s/Uint8_t/Uint8/;s/ft_int64_t/ft_int64/g;s/uint64$/uint64_t/;s/WChar/char32_t/g;s/char32_t char32_t/char32_t WChar/' -i $i; done

Fix: Layouter::GetCharAtPosition counting wrong

Bug introduced in commit 60399e

Codechange: Use unique_ptr for text layout font mapping.

This must stay a pointer as the value passed to other structures.

Codechange: C++-ify the Layouter and related functions

They all now access a std::string_view, instead of a "const char *"
or std::string (in some cases).

Additionally, GetCharAtPosition and friends now return an index
instead of a "const char *", as it makes for a more clear interface.

Feature: drop ICU-lx in favour of directly interfacing with harfbuzz

This means we have RTL support again with ICU 58+. It makes use of:
- ICU for bidi-itemization
- ICU for script-itemization
- OpenTTD for style-itemization
- harfbuzz for shaping

Fix #10057: FallbackParagraphLayout fails to properly wrap

... during the first word after a new run has been started.

Feature: Variable GUI scale.

GUI scale is now variable from 100% to 500%, and no longer restricted to
powers-of-2.

Codechange: Improve LineCache queries (#9417)

Adds the support to query the linecache without copying the string.
This uses a custom transparent comparator in conjunction with
a query type using a std::string_view.

Fix: build with icu-68.1

icu-68.1 removed public macro definitions for TRUE and FALSE

Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>

Codechange: Store text layout runs directly as values in a std::vector instead of heap allocated.

This reduces memory allocations and heap fragmentation.

Codechange: ICU_LAYOUT is in reality ICU_LX (according to their CMake files)

By naming it in a different way, things get a bit confusing.
Especially if we are switching to CMake, which autodetects these
things, we need to use the name the authors of ICU gave it; not
our interpertation of that name.

Add: [OSX] Text layout using the native CoreText API.

By default, the native API will be used instead of ICU, but if ICU is
forced in using configure, it will take precedence.

Add: [Win32] Text layout using the native Windows Uniscribe library.

Uniscribe is sometimes producing different results compared to ICU, especially
when RTL and LTR content is mixed. Comparing the results to other programs
(like editors or web browsers) leads me to believe that the result are at least
not worse than ICU and possibly better.

Add: {PUSH_COLOUR} and {POP_COLOUR} control codes to handle switching colours. (#6737)

This replaces the internal SCC_PREVIOUS_COLOUR swap.

(svn r26017) -Change: allow the fallback and ICU layouter to exist in unison
-Fix [FS#5711]: crash when the ICU layouter thinks a font is corrupted