Add SDL2_ttf bindings.

* sdl2/bindings/ttf.scm: New file.
* sdl2/ttf.scm: New file.
* Makefile.am (SOURCES): Add them.

1 files changed, 93 insertions, 0 deletions

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))))