diff options
Diffstat (limited to 'sdl2')
| -rw-r--r-- | sdl2/bindings/ttf.scm | 76 | ||||
| -rw-r--r-- | sdl2/ttf.scm | 93 |
2 files changed, 169 insertions, 0 deletions
diff --git a/sdl2/bindings/ttf.scm b/sdl2/bindings/ttf.scm new file mode 100644 index 0000000..9808fd4 --- /dev/null +++ b/sdl2/bindings/ttf.scm @@ -0,0 +1,76 @@ +;;; guile-sdl2 --- FFI bindings for SDL2 +;;; Copyright © 2015 David Thompson <davet@gnu.org> +;;; +;;; This file is part of guile-sdl2. +;;; +;;; Guile-sdl2 is free software; you can redistribute it and/or modify +;;; it under the terms of the GNU Lesser General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; Guile-sdl2 is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU Lesser General Public +;;; License along with guile-sdl2. If not, see +;;; <http://www.gnu.org/licenses/>. + +;;; Commentary: +;; +;; Low-level FFI bindings for SDL2_ttf. +;; +;;; Code: + +(define-module (sdl2 bindings ttf) + #:use-module (system foreign) + #:use-module (sdl2 config) + #:use-module (sdl2 bindings)) + +(define sdl-ttf-func + (let ((lib (dynamic-link %libsdl2-ttf))) + (lambda (return-type function-name arg-types) + "Return a procedure for the foreign function FUNCTION-NAME in +the SDL2_ttf shared library. That function must return a value of +RETURN-TYPE and accept arguments of ARG-TYPES." + (pointer->procedure return-type + (dynamic-func function-name lib) + arg-types)))) + +(define-syntax-rule (define-foreign name return-type func-name arg-types) + (define-public name + (sdl-ttf-func return-type func-name arg-types))) + +(define-foreign ttf-init + int "TTF_Init" '()) + +(define-foreign ttf-quit + void "TTF_Quit" '()) + +(define-foreign ttf-open-font + '* "TTF_OpenFont" (list '* int)) + +(define-foreign ttf-close-font + void "TTF_CloseFont" '(*)) + +(define-foreign ttf-font-height + int "TTF_FontHeight" '(*)) + +(define-foreign ttf-render-text-solid + '* "TTF_RenderText_Solid" (list '* '* sdl-color)) + +(define-foreign ttf-render-utf8-solid + '* "TTF_RenderUTF8_Solid" (list '* '* sdl-color)) + +(define-foreign ttf-render-text-shaded + '* "TTF_RenderText_Shaded" (list '* '* sdl-color sdl-color)) + +(define-foreign ttf-render-utf8-shaded + '* "TTF_RenderUTF8_Shaded" (list '* '* sdl-color sdl-color)) + +(define-foreign ttf-render-text-blended + '* "TTF_RenderText_Blended" (list '* '* sdl-color)) + +(define-foreign ttf-render-utf8-blended + '* "TTF_RenderUTF8_Blended" (list '* '* sdl-color)) diff --git a/sdl2/ttf.scm b/sdl2/ttf.scm new file mode 100644 index 0000000..aeb1577 --- /dev/null +++ b/sdl2/ttf.scm @@ -0,0 +1,93 @@ +;;; guile-sdl2 --- FFI bindings for SDL2 +;;; Copyright © 2015 David Thompson <davet@gnu.org> +;;; +;;; This file is part of guile-sdl2. +;;; +;;; Guile-sdl2 is free software; you can redistribute it and/or modify +;;; it under the terms of the GNU Lesser General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; Guile-sdl2 is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU Lesser General Public +;;; License along with guile-sdl2. If not, see +;;; <http://www.gnu.org/licenses/>. + +;;; Commentary: +;; +;; Font rendering. +;; +;;; Code: + +(define-module (sdl2 ttf) + #:use-module (ice-9 format) + #:use-module (system foreign) + #:use-module (sdl2) + #:use-module ((sdl2 bindings ttf) #:prefix ffi:) + #:export (ttf-init + ttf-quit + + font? + load-font + delete-font! + font-height + + render-font-solid + render-font-blended)) + +(define (ttf-init) + "Initialize the TTF system." + (unless (zero? (ffi:ttf-init)) + (sdl-error "ttf-init" "failed to initialize TTF library"))) + +(define (ttf-quit) + "Shut down and clean up the TTF system." + (ffi:ttf-quit)) + +(define-wrapped-pointer-type <font> + font? + wrap-font unwrap-font + (lambda (font port) + (format port "#<font ~x>" + (pointer-address (unwrap-font font))))) + +(define (load-font file point-size) + "Load TTF font from FILE and return a new font object whose glyph +size is POINT-SIZE." + (let ((ptr (ffi:ttf-open-font (string->pointer file) point-size))) + (if (null-pointer? ptr) + (sdl-error "load-font" "failed to load font" file) + (wrap-font ptr)))) + +(define (delete-font! font) + "Delete the memory allocated for FONT." + (ffi:ttf-close-font (unwrap-font font))) + +(define (font-height font) + "Return the maximum height of FONT." + (ffi:ttf-font-height (unwrap-font font))) + +(define (render-font-solid font text color) + "Render TEXT, a UTF-8 encoded string, using FONT and COLOR, the +foreground color, and return a surface containing the results." + (let ((ptr (ffi:ttf-render-utf8-solid (unwrap-font font) + (string->pointer text) + ((@@ (sdl2) color->struct) color)))) + (if (null-pointer? ptr) + (sdl-error "render-font-solid" "failed to render text") + ((@@ (sdl2 surface) wrap-surface) ptr)))) + +(define (render-font-blended font text color) + "Render TEXT, a UTF-8 encoded string, using FONT and COLOR, the +foreground color, and return a high-quality alpha-blended surface +containing the results." + (let ((ptr (ffi:ttf-render-utf8-blended (unwrap-font font) + (string->pointer text) + ((@@ (sdl2) color->struct) color)))) + (if (null-pointer? ptr) + (sdl-error "render-font-solid" "failed to render text") + ((@@ (sdl2 surface) wrap-surface) ptr)))) |