Support for Cairo::CairoPNG on Windows

[cpsievert]

I see the following on Windows:

library(showtext)
font_add_google("Lobster", "lobster")

showtext_auto()

Cairo::CairoPNG("test.png")
plot(1, pch = 16, cex = 3)
#> Error in .Call("showtext_cairo_device_bitmap", PACKAGE = "showtext") : 
#>  "showtext_cairo_device_bitmap" not available for .Call() for package "showtext"
text(1, 1.1, "A fancy dot", family = "lobster", col = "steelblue", cex = 3)
dev.off()
file.show("test.png")

> devtools::session_info()
- Session info ------------------------------------------------------
 setting  value                       
 version  R version 3.6.2 (2019-12-12)
 os       Windows 10 x64              
 system   x86_64, mingw32             
 ui       RStudio                     
 language (EN)                        
 collate  English_United States.1252  
 ctype    English_United States.1252  
 tz       America/Chicago             
 date     2020-05-21                  

- Packages ----------------------------------------------------------
 package     * version date       lib source                          
 assertthat    0.2.1   2019-03-21 [1] CRAN (R 3.6.2)                  
 backports     1.1.7   2020-05-13 [1] CRAN (R 3.6.3)                  
 Cairo         1.5-12  2020-04-11 [1] CRAN (R 3.6.3)                  
 callr         3.4.3   2020-03-28 [1] CRAN (R 3.6.3)                  
 cli           2.0.2   2020-02-28 [1] CRAN (R 3.6.3)                  
 crayon        1.3.4   2017-09-16 [1] CRAN (R 3.6.2)                  
 curl          4.3     2019-12-02 [1] CRAN (R 3.6.2)                  
 desc          1.2.0   2018-05-01 [1] CRAN (R 3.6.2)                  
 devtools      2.3.0   2020-04-10 [1] CRAN (R 3.6.3)                  
 digest        0.6.25  2020-02-23 [1] CRAN (R 3.6.3)                  
 ellipsis      0.3.1   2020-05-15 [1] CRAN (R 3.6.2)                  
 fansi         0.4.1   2020-01-08 [1] CRAN (R 3.6.2)                  
 fs            1.4.1   2020-04-04 [1] CRAN (R 3.6.3)                  
 glue          1.4.1   2020-05-13 [1] CRAN (R 3.6.2)                  
 jsonlite      1.6.1   2020-02-02 [1] CRAN (R 3.6.2)                  
 magrittr      1.5     2014-11-22 [1] CRAN (R 3.6.2)                  
 memoise       1.1.0   2017-04-21 [1] CRAN (R 3.6.2)                  
 packrat       0.5.0   2018-11-14 [1] CRAN (R 3.6.3)                  
 pkgbuild      1.0.8   2020-05-07 [1] CRAN (R 3.6.3)                  
 pkgload       1.0.2   2018-10-29 [1] CRAN (R 3.6.2)                  
 prettyunits   1.1.1   2020-01-24 [1] CRAN (R 3.6.2)                  
 processx      3.4.2   2020-02-09 [1] CRAN (R 3.6.2)                  
 ps            1.3.3   2020-05-08 [1] CRAN (R 3.6.3)                  
 R6            2.4.1   2019-11-12 [1] CRAN (R 3.6.2)                  
 remotes       2.1.1   2020-02-15 [1] CRAN (R 3.6.2)                  
 rlang         0.4.6   2020-05-02 [1] CRAN (R 3.6.3)                  
 rprojroot     1.3-2   2018-01-03 [1] CRAN (R 3.6.2)                  
 rstudioapi    0.11    2020-02-07 [1] CRAN (R 3.6.2)                  
 sessioninfo   1.1.1   2018-11-05 [1] CRAN (R 3.6.2)                  
 showtext    * 0.8     2020-05-21 [1] Github (yixuan/showtext@5af3fed)
 showtextdb  * 2.0     2017-09-11 [1] CRAN (R 3.6.3)                  
 sysfonts    * 0.8.1   2020-05-08 [1] CRAN (R 3.6.3)                  
 testthat      2.3.2   2020-03-02 [1] CRAN (R 3.6.3)                  
 usethis       1.6.1   2020-04-29 [1] CRAN (R 3.6.3)                  
 withr         2.2.0   2020-04-20 [1] CRAN (R 3.6.3)                  

[1] C:/Users/Carson Sievert/Documents/R/win-library/3.6
[2] C:/Program Files/R/R-3.6.2/library

[yixuan]

Oops, it is a bug on Windows. It has been fixed in 05cf3b9, but I may not be able to submit it to CRAN until next month.

[cpsievert]

Thanks! Can confirm that fixes the issue.

BTW, in case it's CRAN policy making you wait on another release, I've found that, recently, they've been much more willing to accept patch releases within 1-3 weeks of a previous release

[yixuan]

I see. I'll try later. Thanks for the information.