;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-;; $Id: cairo.lisp,v 1.23 2008/10/27 18:39:30 espen Exp $
+;; $Id: cairo.lisp,v 1.25 2009/02/09 11:45:03 espen Exp $
(in-package "CAIRO")
(data :allocation :alien :type pointer)
(length :allocation :alien :type int))
(:metaclass proxy-class)
- (:unref %path-destroy)))
+ (:unref %path-destroy))
+
+ (defclass jpeg-parameter (struct)
+ ((quality
+ :allocation :alien
+ :initarg :quality
+ :initform 75
+ :type int)
+ (interlace
+ :allocation :alien
+ :initarg :interlace
+ :initform t
+ :type boolean))
+ (:metaclass struct-class)))
+
+
+(define-condition cairo-error (error)
+ ((status :initarg :status :reader cairo-status))
+ (:report (lambda (condition stream)
+ (format stream "Cairo function returned with status code: ~A"
+ (cairo-status condition)))))
+
+(deftype status-signal () 'status)
+
+(define-type-method from-alien-form ((type status-signal) status &key ref)
+ (declare (ignore type ref))
+ `(let ((status ,(from-alien-form 'status status)))
+ (unless (eq status :success)
+ (error 'cairo-error :status status))
+ status))
+
;;; Cairo context
;;; Surfaces
+(defgeneric user-data (surface key))
+(defgeneric (setf user-data) (value surface key))
+
(defmethod make-proxy-instance :around ((class surface-class) location
&rest initargs)
(let ((class (find-class (%surface-get-type location))))
(defbinding %surface-destroy () nil
(location pointer))
+(defbinding %surface-status () status
+ pointer)
+
+(defmethod allocate-foreign :around ((surface surface) &key)
+ (let ((location (call-next-method)))
+ (cond
+ ((not (eq (%surface-status location) :success))
+ (%surface-destroy location)
+ (error 'cairo-error :status (%surface-status location)))
+ (t location))))
+
(defmethod reference-function ((class surface-class))
(declare (ignore class))
#'%surface-reference)
(declare (ignore class))
#'%surface-destroy)
-(defbinding %surface-set-user-data (surface key data-id) status
+(defbinding %surface-set-user-data (surface key data-id) status-signal
(surface pointer)
((quark-intern key) pointer-data)
(data-id pointer-data)
(x-pixels-per-inch double-float)
(y-pixels-per-inch double-float))
+(defun %stream-write-func (stream-id data length)
+ (let ((stream (find-user-data stream-id))
+ (sequence
+ (map-c-vector 'vector #'identity data '(unsigned-byte 8) length)))
+ (handler-case (etypecase stream
+ (stream
+ (write-sequence sequence stream)
+ length)
+ ((or symbol function)
+ (funcall stream sequence)))
+ (serious-condition (condition)
+ (declare (ignore condition))
+ 0))))
+
(define-callback stream-write-func status
((stream-id pointer-data) (data pointer) (length unsigned-int))
- (let ((stream (find-user-data stream-id)))
- (typecase stream
- (stream
- (map-c-vector 'nil #'(lambda (octet) (write-byte octet stream))
- data '(unsigned-byte 8) length))
- ((or symbol function)
- (funcall stream
- (map-c-vector 'vector #'identity data '(unsigned-byte 8) length)))))
- :success)
+ (if (= (%stream-write-func stream-id data length) length)
+ :success
+ :write-error))
+
+(defun %stream-read-func (stream-id data length)
+ (let* ((stream (find-user-data stream-id)))
+ (handler-case
+ (multiple-value-bind (sequence bytes-read)
+ (etypecase stream
+ (stream
+ (let ((sequence (make-array length
+ :element-type '(unsigned-byte 8))))
+ (values sequence (read-sequence sequence stream))))
+ ((or symbol function) (funcall stream length)))
+ (make-c-vector '(unsigned-byte 8) (or bytes-read (length sequence))
+ :content sequence :location data)
+ (or bytes-read (length sequence)))
+ (serious-condition (condition)
+ (declare (ignore condition))
+ 0))))
(define-callback stream-read-func status
((stream-id pointer-data) (data pointer) (length unsigned-int))
- (block stream-read
- (let ((stream (find-user-data stream-id)))
- (typecase stream
- (stream
- (loop for i below length do
- (let ((byte (read-byte stream nil)))
- (if byte
- (setf (gffi::ref-uint-8 data i) byte)
- (return-from stream-read :read-error)))))
- ((or symbol function) (funcall stream data length))))
- :success))
-
+ (if (= (%stream-read-func stream-id data length) length)
+ :success
+ :read-error))
(defmacro with-surface ((surface cr) &body body)
`(let ((,cr (make-instance 'context :target ,surface)))
;; Image Surface
-;; Should data be automatically freed when the surface is GCed?
-(defmethod allocate-foreign ((surface image-surface) &key stream filename
- width height stride format data)
- (cond
- (stream
- (let ((stream-id (register-user-data stream)))
+(defmethod allocate-foreign ((surface image-surface) &key source type
+ width height stride format)
+ (etypecase source
+ (null (%image-surface-create format width height))
+ ((or stream function symbol)
+ (let ((stream-id (register-user-data source)))
(unwind-protect
- (%image-surface-create-from-png-stream stream-id)
+ (cond
+ ((member type '("png" "image/png") :test #'equal)
+ (%image-surface-create-from-png-stream stream-id))
+ ((member type '("jpeg" "image/jpeg") :test #'equal)
+ (%image-surface-create-from-jpeg-stream stream-id))
+ ((not type) (error "Image type must be specified"))
+ ((error "Can't handle image type ~A" type)))
(destroy-user-data stream-id))))
- (filename (%image-surface-create-from-png filename))
- ((not data) (%image-surface-create format width height))
- (t
- (%image-surface-create-for-data data format width height
- (or
- stride
- (let ((element-size (cdr (assoc format '((:argb32 . 4) (:rgb24 . 4) (:a8 . 1) (:a1 1/8))))))
- (ceiling (* width element-size))))))))
+ ((or string pathname)
+ (cond
+ ((member type '("png" "image/png") :test #'equal)
+ (%image-surface-create-from-png source))
+ ((member type '("jpeg" "image/jpeg") :test #'equal)
+ (%image-surface-create-from-jpeg source))
+ ((not type) (error "Image type must be specified"))
+ ((error "Can't handle image type ~A" type))))
+ (pointer
+ (%image-surface-create-for-data source format width height
+ (or stride (format-stride-for-width format width))))))
+
+#?(pkg-exists-p "cairo" :atleast-version "1.6")
+(defbinding format-stride-for-width () int
+ surface-format (width int))
+
+#?-(pkg-exists-p "cairo" :atleast-version "1.6")
+(defun format-stride-for-width (format width)
+ (let ((element-size (cdr (assoc format '((:argb32 . 4) (:rgb24 . 4) (:a8 . 1) (:a1 1/8))))))
+ (ceiling (* width element-size))))
(defbinding %image-surface-create () pointer
(stream-read-func callback)
(stream pointer-data))
-(defbinding surface-write-to-png () status
+(defbinding %surface-write-to-png () status-signal
(surface surface)
(filename pathname))
-
-(defbinding %surface-write-to-png-stream (surface stream) status
+(defbinding %surface-write-to-png-stream (surface stream) status-signal
(surface surface)
(stream-write-func callback)
(stream pointer-data))
-(defun surface-write-to-png-stream (surface stream)
+(defgeneric surface-write-to-png (surface dest))
+
+(defmethod surface-write-to-png (surface filename)
+ (%surface-write-to-png surface filename))
+
+(defmethod surface-write-to-png (surface (stream stream))
(let ((stream-id (register-user-data stream)))
(unwind-protect
(%surface-write-to-png-stream surface stream-id)
(destroy-user-data stream-id))))
+;;; JPEG support
+
+(define-callback jpeg-stream-write-func unsigned
+ ((stream-id pointer-data) (data pointer) (length unsigned-int))
+ (%stream-write-func stream-id data length))
+
+(define-callback jpeg-stream-read-func unsigned
+ ((stream-id pointer-data) (data pointer) (length unsigned-int))
+ (%stream-read-func stream-id data length))
+
+(defbinding %image-surface-create-from-jpeg () pointer
+ (filename pathname)
+ (status status-signal :out))
+
+(defbinding %image-surface-create-from-jpeg-stream (stream) pointer
+ (jpeg-stream-read-func callback)
+ (stream pointer-data)
+ (status status-signal :out))
+
+(defgeneric surface-write-to-jpeg (surface dest &key quality interlace))
+
+(defun %surface-acquire-image (surface)
+ (typecase surface
+ (image-surface surface)
+ ((let ((image (make-instance 'image-surface
+ :width (surface-width surface)
+ :height (surface-height surface)
+ :format :argb32)))
+ (with-surface (image cr)
+ (set-source-surface cr surface)
+ (setf (operator cr) :source)
+ (paint cr))
+ image))))
+
+(defbinding %surface-write-to-jpeg () status-signal
+ (surface image-surface)
+ (filename pathname)
+ (param jpeg-parameter))
+
+(defmethod surface-write-to-jpeg (surface filename &key
+ (quality 75) (interlace t))
+ (let ((param (make-instance 'jpeg-parameter
+ :quality quality :interlace interlace)))
+ (%surface-write-to-jpeg (%surface-acquire-image surface) filename param)))
+
+(defbinding %surface-write-to-jpeg-stream (surface stream param) status-signal
+ (surface surface)
+ (jpeg-stream-write-func callback)
+ (stream pointer-data)
+ (param jpeg-parameter))
+
+(defmethod surface-write-to-jpeg (surface (stream stream) &key
+ (quality 75) (interlace t))
+ (let ((stream-id (register-user-data stream))
+ (param (make-instance 'jpeg-parameter
+ :quality quality :interlace interlace)))
+ (unwind-protect
+ (%surface-write-to-jpeg-stream (%surface-acquire-image surface) stream-id param)
+ (destroy-user-data stream-id))))
+
+
;;; Virtual size surface (abstract class)
(defmethod initialize-instance :after ((surface vector-surface) &key
~mdw / clg / blobdiff