testapp: allow to render text with SDL_TextEngine (key 'x')

[1bsyl]

@slouken
this allow to use testapp with textengine and compare none/surface/renderer

allow, it seems "TE renderer" asserts with:

Assertion failure at CreateDrawSequence (//SDL_ttf_git/src/SDL_renderer_textengine.c:540), triggered 1 time:
  'num_ops > 0'

while "TE surface" doesn't assert

[slouken]

This seems fine, but can you give me a standalone repro for the num_ops assertion?

[1bsyl]

@slouken
it seems this happens with the first rendering of testapp :
fonts/FletcherGothicFLF.ttf
and this is string in test_strings[0]

just do ./testapp and press x x and it asserts.
you need the fonts file also in "./fonts/FletcherGothicFLF.ttf"

[slouken]

I'm not reproducing this with the current head. Has it been fixed?

[1bsyl]

@slouken
this is still present in current HEAD.
renderer_surface would also assert, but the is no "SDL_assert(num_ops > 0);"

after, Render_Line_TextEngine num_ops is still 0

Render_Line_TextEngine:
pos_len is 4. The 4 glyphs are found, but widths and rows are 0. o no increment `op_index++

( glyph->sz_width == glyph->sz_rows == 0
and also last glyph_width == glyph_rows == 0 )

the string is of course wrong because testapp is meant to break rendering with corner case.
I compile with SDL_ttf:

CMAKE_FLAGS+=" -DSDLTTF_VENDORED=ON "
        CMAKE_FLAGS+=" -DSDLTTF_HARFBUZZ=ON "

[slouken]

I'm not seeing this here at all. Maybe my version of the font is different? Can you create an issue and provide a modification to showfont and attach a link to the font you're using so I can repro in a debugger?

[1bsyl]

./showfont -textengine renderer fonts/FletcherGothicFLF.ttf 20 "纸"

[1bsyl]

then font I have FletcherGothicFLF.ttf.txt

[1bsyl]

@slouken here it is