src/core/packages/graphics.sgl

1;;; Software rasterisation.

2;;;

3;;; pixman is foot's renderer: foot draws its cells into pixman images in

4;;; shared memory and hands the buffer to the compositor through `wl_shm`.

5;;; There is no GPU path in foot at all, which is why nothing in this channel

6;;; needs Mesa, a DRM driver, or anything else that would have to match the

7;;; host's graphics stack.

8;;;

9;;; VERSION, and this is a deliberate choice rather than staleness: 0.42.2 is

10;;; the last pixman release with an autotools build. 0.43 and later are

11;;; meson-only. foot's meson.build asks only for `pixman-1` with no version

12;;; constraint -- it tests `pixman.version().version_compare('>=0.46.0')` to

13;;; decide whether to define HAVE_PIXMAN_RGBA_16, and simply does not define it

14;;; otherwise. So taking the autotools release costs one optional pixel format

15;;; and removes a meson build from the chain.

16(define-library (core packages graphics)

17 (import (sigil core)

18 (core build-environments)

19 (core packages compression)

20 (sigil env package)

21 (sigil build external))

22 (export pixman libpng)

23 (begin

24 (define pixman

25 (package

26 name: "pixman"

27 version: "0.42.2"

28 source: (external-source

29 location: "https://cairographics.org/releases/pixman-0.42.2.tar.gz"

30 sha256: "ea1480efada2fd948bc75366f7c349e1c96d3297d09a3fe62626e38e234a625e")

31 buildenv: core-buildenv

32 phases: (list

33 (external-phase

34 kind: 'configure

35 args: (list "--prefix=${out}"

36 "--disable-shared"

37 "--enable-static"

38 ;; Every one of these is a probe that would

39 ;; otherwise make the output depend on what

40 ;; happens to be visible in the build

41 ;; environment. Turning them off is what makes

42 ;; the result a function of the declared

43 ;; inputs rather than of the sandbox's luck.

44 "--disable-gtk"

45 "--disable-libpng"

46 "--disable-openmp"))

47 (external-phase kind: 'make)

48 (external-phase kind: 'install))))

50 ;; libpng exists here for `grim`, the screenshot client, and for nothing

51 ;; else -- foot renders through pixman and never encodes an image.

52 ;;

53 ;; zlib is declared for the reason set out at length on `fontconfig` in

54 ;; (core packages fonts): libpng's generated `libpng.pc` carries a

55 ;; `Requires:` on zlib, and this channel composes PKG_CONFIG_PATH from

56 ;; DIRECT dependencies only. It is also simply true -- PNG's compression

57 ;; IS zlib's deflate, so zlib is on every libpng consumer's static link

58 ;; line.

59 (define libpng

60 (package

61 name: "libpng"

62 version: "1.6.50"

63 source: (external-source

64 location: "https://download.sourceforge.net/libpng/libpng-1.6.50.tar.xz"

65 sha256: "4df396518620a7aa3651443e87d1b2862e4e88cad135a8b93423e01706232307")

66 buildenv: core-buildenv

67 dependencies: (list zlib)

68 phases: (list

69 (external-phase

70 kind: 'configure

71 args: (list "--prefix=${out}"

72 "--disable-shared"

73 "--enable-static"))

74 (external-phase kind: 'make)

75 (external-phase kind: 'install)

76 (external-phase

77 kind: 'run

78 args: (list "sh" "-c"

79 (string-append

80 "set -eu\n"

81 "d=\"$(dirname \"$PWD\")/install-root\"\n"

82 "test -f \"$d${out}/lib/pkgconfig/libpng.pc\"\n"

83 "echo LIBPNG-PC-PRESENT\n"))))))))