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typesetting/quad/render.rkt

106 lines
4.3 KiB
Racket

10 years ago
#lang racket/base
(require racket/class racket/contract sugar/debug sugar/cache racket/list racket/file racket/draw data/gvector)
(require "utils.rkt" "quads.rkt" "world.rkt")
(provide (all-defined-out))
(define/contract abstract-renderer%
(class/c [render (quad? . ->m . any/c)]
[render-element (quad? . ->m . quad?)])
(class object%
(super-new)
(define renderable-quads '(word box))
;; hash implementation
(define/public (render0 doc-quad)
(finalize
(let ([rendering-input (flatten-quad (setup doc-quad))])
(define page-quad-hash (make-hash))
(for ([q (in-list rendering-input)])
(when (member (quad-name q) renderable-quads)
(hash-update! page-quad-hash (quad-attr-ref q world:page-key) (λ(v) (cons q v)) null)))
(map (λ(k) (render-page (hash-ref page-quad-hash k))) (sort (hash-keys page-quad-hash) <)))))
;; gvector implementation
(define/public (render doc-quad)
(finalize
(let ([rendering-input (flatten-quad (setup doc-quad))])
(define page-quad-vector (make-gvector))
(for ([q (in-list rendering-input)] #:when (member (quad-name q) renderable-quads))
(define p (quad-attr-ref q world:page-key))
(gvector-set! page-quad-vector p (cons q (gvector-ref page-quad-vector p null))))
(for/list ([pq (in-gvector page-quad-vector)])
(render-page pq)))))
(define/public (render-element q)
(cond
[(word? q) (render-word q)]
[else q]))
(define/public (setup q) q)
(abstract render-page)
(abstract render-word)
(define/public (finalize q) q)))
(define-syntax-rule (map/send method xs)
(map (λ(x) (method x)) xs))
(define pdf-renderer%
(class abstract-renderer%
(super-new)
(send* (current-ps-setup) (set-margin 0 0) (set-scaling 1.0 1.0))
(define dc-output-port (open-output-bytes))
(define dc (new pdf-dc% [interactive #f][use-paper-bbox #f][as-eps #f]
[output dc-output-port]
[width (world:paper-width-default)][height (world:paper-height-default)]))
(define/override (setup tx)
(send* dc
(start-doc "boing")
(set-pen "black" 1 'solid)
(set-brush "black" 'transparent)) ; no fill by default
tx)
(inherit render-element)
(define/caching (make-font/caching font size style weight)
(make-font #:face font #:size size #:style style #:weight weight))
(define/override-final (render-word w)
(define word-font (quad-attr-ref/parameter w world:font-name-key))
(define word-size (quad-attr-ref/parameter w world:font-size-key))
(define word-style (quad-attr-ref/parameter w world:font-style-key))
(define word-weight (quad-attr-ref/parameter w world:font-weight-key))
(define word-color (quad-attr-ref/parameter w world:font-color-key))
(define word-background (quad-attr-ref/parameter w world:font-background-key))
(send dc set-font (make-font/caching word-font word-size word-style word-weight))
(send dc set-text-foreground (send the-color-database find-color word-color))
(define background-color (send the-color-database find-color word-background))
(if background-color ; all invalid color-string values will return #f
(send* dc (set-text-mode 'solid) (set-text-background background-color))
(send dc set-text-mode 'transparent))
(define word-text (quad-car w))
(send dc draw-text word-text (quad-attr-ref w world:x-position-key)
;; we want to align by baseline rather than top of box
;; thus, subtract ascent from y to put baseline at the y coordinate
(- (quad-attr-ref w world:y-position-key) (quad-attr-ref w world:ascent-key 0)) #t))
(define/override-final (render-page elements)
(send dc start-page)
(map/send render-element (filter-not whitespace/nbsp? elements))
(send dc end-page))
(define/override-final (finalize xs)
(send dc end-doc)
(get-output-bytes dc-output-port))
(define/public (render-to-file doc-quad path)
(define result-bytes (send this render doc-quad))
(display-to-file result-bytes path #:exists 'replace #:mode 'binary))))