From 044a27838bfd93d9d94881caf2031e7c55a7f1d1 Mon Sep 17 00:00:00 2001
From: Chris Hanson <org/chris-hanson/cph>
Date: Tue, 21 Feb 1995 23:15:58 +0000
Subject: [PATCH] Yet another cut at getting backing store and image stuff to
work correctly. Nearly done now.
---
v7/src/runtime/os2graph.scm | 553 ++++++++++++++++++++++++++++++------
1 file changed, 474 insertions(+), 79 deletions(-)
diff --git a/v7/src/runtime/os2graph.scm b/v7/src/runtime/os2graph.scm
index 4790ccf8b..d207d618c 100644
--- a/v7/src/runtime/os2graph.scm
+++ b/v7/src/runtime/os2graph.scm
@@ -1,6 +1,6 @@
#| -*-Scheme-*-
-$Id: os2graph.scm,v 1.5 1995/02/14 00:36:58 cph Exp $
+$Id: os2graph.scm,v 1.6 1995/02/21 23:15:58 cph Exp $
Copyright (c) 1995 Massachusetts Institute of Technology
@@ -39,17 +39,13 @@ MIT in each case. |#
(declare (integrate-external "graphics"))
(declare (integrate-external "os2winp"))
-(define os2-graphics-device-type)
-(define event-descriptor)
-(define event-previewer-registration)
-(define window-list)
-(define color-table)
-
(define (initialize-package!)
(set! os2-graphics-device-type
(make-graphics-device-type
+ 'OS/2
`((activate-window ,os2-graphics/activate-window)
(available? ,os2-graphics/available?)
+ (capture-image ,os2-graphics/capture-image)
(clear ,os2-graphics/clear)
(close ,os2-graphics/close)
(color? ,os2-graphics/color?)
@@ -58,6 +54,7 @@ MIT in each case. |#
(define-color ,os2-graphics/define-color)
(desktop-size ,os2-graphics/desktop-size)
(device-coordinate-limits ,os2-graphics/device-coordinate-limits)
+ (discard-events ,os2-graphics/discard-events)
(drag-cursor ,os2-graphics/drag-cursor)
(draw-line ,os2-graphics/draw-line)
(draw-lines ,os2-graphics/draw-lines)
@@ -72,30 +69,59 @@ MIT in each case. |#
(move-cursor ,os2-graphics/move-cursor)
(open ,os2-graphics/open)
(raise-window ,os2-graphics/raise-window)
+ (read-button ,os2-graphics/read-button)
+ (read-user-event ,os2-graphics/read-user-event)
(reset-clip-rectangle ,os2-graphics/reset-clip-rectangle)
(restore-window ,os2-graphics/restore-window)
+ (select-user-events ,os2-graphics/select-user-events)
(set-background-color ,os2-graphics/set-background-color)
(set-clip-rectangle ,os2-graphics/set-clip-rectangle)
(set-coordinate-limits ,os2-graphics/set-coordinate-limits)
(set-drawing-mode ,os2-graphics/set-drawing-mode)
(set-font ,os2-graphics/set-font)
(set-foreground-color ,os2-graphics/set-foreground-color)
+ (set-image-colormap ,os2-graphics/set-image-colormap)
(set-line-style ,os2-graphics/set-line-style)
(set-window-position ,os2-graphics/set-window-position)
(set-window-size ,os2-graphics/set-window-size)
(set-window-title ,os2-graphics/set-window-title)
(window-position ,os2-graphics/window-position)
(window-size ,os2-graphics/window-size))))
- (register-graphics-device-type 'OS/2 os2-graphics-device-type)
+ (1d-table/put!
+ (graphics-type-properties os2-graphics-device-type)
+ 'IMAGE-TYPE
+ (make-image-type
+ `((create ,os2-image/create)
+ (destroy ,os2-image/destroy)
+ (width ,os2-image/width)
+ (height ,os2-image/height)
+ (draw ,os2-image/draw)
+ (draw-subimage ,os2-image/draw-subimage)
+ (fill-from-byte-vector ,os2-image/fill-from-byte-vector))))
(set! event-descriptor #f)
(set! event-previewer-registration #f)
(set! window-list (make-protection-list))
+ (set! image-list (make-protection-list))
(set! color-table '())
+ (set! user-event-mask user-event-mask:default)
+ (set! user-event-queue (make-queue))
(for-each (lambda (entry)
(os2-graphics/define-color #f (car entry) (cdr entry)))
initial-color-definitions)
(add-event-receiver! event:before-exit finalize-pm-state!)
(add-gc-daemon! close-lost-objects-daemon))
+
+(define os2-graphics-device-type)
+(define event-descriptor)
+(define event-previewer-registration)
+(define window-list)
+(define image-list)
+(define color-table)
+(define user-event-mask)
+(define user-event-queue)
+
+;; This event mask contains just button events.
+(define user-event-mask:default #x0001)
(define (finalize-pm-state!)
(if event-descriptor
@@ -103,29 +129,30 @@ MIT in each case. |#
(do ((windows (protection-list-elements window-list) (cdr windows)))
((null? windows))
(close-window (car windows)))
+ (do ((images (protection-list-elements image-list) (cdr images)))
+ ((null? images))
+ (destroy-image (car images)))
(deregister-input-thread-event event-previewer-registration)
(set! event-previewer-registration #f)
+ (set! user-event-mask user-event-mask:default)
+ (flush-queue! user-event-queue)
(os2win-close-event-qid event-descriptor)
(set! event-descriptor #f)
unspecific)))
(define (close-lost-objects-daemon)
- (clean-lost-protected-objects window-list os2win-close))
+ (clean-lost-protected-objects window-list os2win-close)
+ (clean-lost-protected-objects image-list destroy-memory-ps))
;;;; Window Abstraction
(define-structure (window
(conc-name window/)
- (constructor %make-window
- (wid pel-width
- pel-height
- backing-store
- backing-store-bitmap)))
+ (constructor %make-window (wid pel-width pel-height)))
wid
pel-width
pel-height
- (backing-store #f read-only #t)
- backing-store-bitmap
+ backing-image
(changes #f)
(x-gcursor 0)
(y-gcursor 0)
@@ -133,27 +160,25 @@ MIT in each case. |#
(y-bottom -1)
(x-right 1)
(y-top 1)
- (x-slope (/ (- pel-width 1) 2))
- (y-slope (/ (- pel-height 1) 2))
+ (x-slope (exact->inexact (/ (- pel-width 1) 2)))
+ (y-slope (exact->inexact (/ (- pel-height 1) 2)))
font-specifier
font-metrics
(foreground-color #xFFFFFF)
- (background-color #x000000))
-
-(define (make-window wid)
- (let ((window
- (let ((w.h (os2win-get-size wid))
- (psid (os2ps-create-memory-ps)))
- (let ((bid (os2ps-create-bitmap psid pel-width pel-height)))
- (os2ps-set-bitmap psid bid)
- (%make-window wid (car w.h) (cdr w.h) psid bid)))))
+ (background-color #x000000)
+ (image-colormap #f)
+ device)
+
+(define (make-window wid width height)
+ (let ((window (%make-window wid width height)))
+ (set-window/backing-image! window (create-image window width height))
(add-to-protection-list! window-list window wid)
window))
(define (close-window window)
(if (window/wid window)
(begin
- (os2ps-destroy-memory-ps (window/backing-store window))
+ (destroy-image (window/backing-image window))
(os2win-close (window/wid window))
(set-window/wid! window #f)
(remove-from-protection-list! window-list window))))
@@ -164,50 +189,65 @@ MIT in each case. |#
(define-integrable (os2-graphics-device/psid device)
(window/backing-store (graphics-device/descriptor device)))
-(define (compute-window-slopes! window)
- (set-window/x-slope! window
- (/ (- (window/pel-width window) 1)
- (- (window/x-right window) (window/x-left window))))
- (set-window/y-slope! window
- (/ (- (window/pel-height window) 1)
- (- (window/y-top window) (window/y-bottom window)))))
+(define-integrable (window/backing-store window)
+ (image/ps (window/backing-image window)))
-(define (set-window-font! window font-specifier)
- (set-window/font-specifier! window font-specifier)
- (set-window/font-metrics!
+(define (compute-window-slopes! window)
+ (set-window/x-slope!
window
- (let ((metrics
- (os2ps-set-font (window/backing-store window) 1 font-specifier)))
- (if (not metrics)
- (error "Unknown font name:" font-specifier))
- metrics)))
+ (exact->inexact
+ (/ (- (window/pel-width window) 1)
+ (- (window/x-right window) (window/x-left window)))))
+ (set-window/y-slope!
+ window
+ (exact->inexact
+ (/ (- (window/pel-height window) 1)
+ (- (window/y-top window) (window/y-bottom window))))))
(define (window/x->device window x)
(round->exact (* (window/x-slope window) (- x (window/x-left window)))))
(define (window/y->device window y)
(round->exact (* (window/y-slope window) (- y (window/y-bottom window)))))
+
+(define (window/device->x window x)
+ (+ (/ x (window/x-slope window)) (window/x-left window)))
+
+(define (window/device->y window y)
+ (+ (/ y (window/y-slope window)) (window/y-bottom window)))
;;;; Standard Operations
(define (os2-graphics/available?)
(implemented-primitive-procedure? os2win-open))
-(define (os2-graphics/open descriptor->device)
+(define (os2-graphics/open descriptor->device #!optional width height)
(if (not event-descriptor)
- (let ((descriptor (os2win-open-event-qid)))
- (set! event-previewer-registration (make-event-previewer descriptor))
- (set! event-descriptor descriptor)))
+ (begin
+ (set! event-descriptor (os2win-open-event-qid))
+ (set! event-previewer-registration
+ (permanently-register-input-thread-event
+ event-descriptor
+ (current-thread)
+ read-and-process-event))))
+ (open-window descriptor->device
+ (if (default-object? width) 256 width)
+ (if (default-object? height) 256 height)))
+
+(define (open-window descriptor->device width height)
(let ((wid (os2win-open event-descriptor "Scheme Graphics")))
(os2win-show-cursor wid #f)
(os2win-show wid #t)
+ (os2win-set-size wid width height)
+ (pm-synchronize)
(os2win-set-state wid window-state:deactivate)
(os2win-set-state wid window-state:top)
- (let ((window (make-window wid)))
+ (let ((window (make-window wid width height)))
(update-colors window)
(set-window-font! window "4.System VIO")
(let ((device (descriptor->device window)))
(os2-graphics/clear device)
+ (set-window/device! window device)
device))))
(define (os2-graphics/close device)
@@ -258,7 +298,7 @@ MIT in each case. |#
(os2ps-line (window/backing-store window) xe ye)
(set-window/x-gcursor! window xe)
(set-window/y-gcursor! window ye)
- (invalidate-rectangle device xl yl xh yh)))))))
+ (invalidate-rectangle device xl xh yl yh)))))))
(define (os2-graphics/draw-line device x-start y-start x-end y-end)
(os2-graphics/move-cursor device x-start y-start)
@@ -275,7 +315,7 @@ MIT in each case. |#
(xh (fix:+ (fix:vector-max xv) 1))
(yh (fix:+ (fix:vector-max yv) 1)))
(os2ps-poly-line-disjoint (window/backing-store window) xv yv)
- (invalidate-rectangle device xl yl xh yh)))))))
+ (invalidate-rectangle device xl xh yl yh)))))))
(define (os2-graphics/draw-point device x y)
;; This sucks. Implement a real point-drawing primitive.
@@ -285,7 +325,7 @@ MIT in each case. |#
(let ((x (window/x->device window x))
(y (window/y->device window y)))
(os2ps-draw-point (window/backing-store window) x y)
- (invalidate-rectangle device x y (fix:+ x 1) (fix:+ y 1)))))))
+ (invalidate-rectangle device x (fix:+ x 1) y (fix:+ y 1)))))))
(define (os2-graphics/draw-text device x y string)
(let ((window (graphics-device/descriptor device))
@@ -304,9 +344,9 @@ MIT in each case. |#
length)
(invalidate-rectangle device
x
- y
(fix:+ x
(os2ps-text-width psid string 0 length))
+ y
(fix:+ y (font-metrics/height metrics))))))))
(define (os2-graphics/flush device)
@@ -450,14 +490,10 @@ MIT in each case. |#
(os2win-set-size (os2-graphics-device/wid device) width height))
(define (os2-graphics/window-frame-size device)
- (let ((w.h (os2win-get-size (os2-graphics-device/wid device))))
+ (let ((w.h (os2win-get-frame-size (os2-graphics-device/wid device))))
(values (car w.h)
(cdr w.h))))
-(define (os2-graphics/display-size device)
- device
- (values (os2win-desktop-width) (os2win-desktop-height)))
-
(define (os2-graphics/window-position device)
(let ((x.y (os2win-get-pos (os2-graphics-device/wid device))))
(values (car x.y)
@@ -574,6 +610,23 @@ MIT in each case. |#
;;;; Miscellaneous Support
+(define (set-window-font! window font-specifier)
+ (set-window/font-specifier! window font-specifier)
+ (set-window/font-metrics!
+ window
+ (let ((metrics
+ (os2ps-set-font (window/backing-store window) 1 font-specifier)))
+ (if (not metrics)
+ (error "Unknown font name:" font-specifier))
+ metrics)))
+
+(define (without-thread-events thunk)
+ (let ((block-events? (block-thread-events)))
+ (let ((value (thunk)))
+ (if (not block-events?)
+ (unblock-thread-events))
+ value)))
+
(define (fix:vector-min v)
(let ((length (vector-length v))
(min (vector-ref v 0)))
@@ -634,28 +687,31 @@ MIT in each case. |#
;;;; Events
-(define (make-event-previewer descriptor)
- (permanently-register-input-thread-event
- descriptor
- (current-thread)
- (lambda ()
- (let ((event (os2win-get-event descriptor #f)))
- (if event
- (process-event event))))))
+(define (pm-synchronize)
+ (os2pm-synchronize)
+ (without-thread-events (lambda () (do () ((not (read-and-process-event)))))))
+
+(define (read-and-process-event)
+ (let ((event (os2win-get-event event-descriptor #f)))
+ (and event
+ (begin (process-event event) #t))))
(define (process-event event)
- (let ((window
- (search-protection-list window-list
- (let ((wid (event-wid event)))
- (lambda (window)
- (eq? (window/wid window) wid))))))
- (if window
- (let ((handler (vector-ref event-handlers (event-type event))))
- (if handler
- (handler window event))))))
-
-(define event-handlers
- (make-vector number-of-event-types #f))
+ (without-interrupts
+ (lambda ()
+ (let ((window
+ (search-protection-list window-list
+ (let ((wid (event-wid event)))
+ (lambda (window)
+ (eq? (window/wid window) wid))))))
+ (if window
+ (begin
+ (let ((handler (vector-ref event-handlers (event-type event))))
+ (if handler
+ (handler window event)))
+ (maybe-queue-user-event window event)))))))
+
+(define event-handlers (make-vector number-of-event-types #f))
(define-integrable (define-event-handler event-type handler)
(vector-set! event-handlers event-type handler))
@@ -701,14 +757,353 @@ MIT in each case. |#
BBO_IGNORE)
(os2ps-set-bitmap new #f)
(os2ps-destroy-memory-ps new))
- (os2ps-destroy-bitmap (os2ps-set-bitmap old bitmap))
- (set-window/backing-store-bitmap! window bitmap)))
+ (os2ps-destroy-bitmap (os2ps-set-bitmap old bitmap))))
(set-window/pel-width! window width)
(set-window/pel-height! window height)
(compute-window-slopes! window)
(os2win-invalidate (window/wid window) 0 width 0 height)
(set-window/changes! window #f))))
+;;;; User Events
+
+(define (maybe-queue-user-event window event)
+ (if (not (fix:= 0 (fix:and (fix:lsh 1 (event-type event)) user-event-mask)))
+ (begin
+ (set-event-wid! event (window/device window))
+ (enqueue!/unsafe user-event-queue event))))
+
+(define (os2-graphics/select-user-events device mask)
+ device
+ (if (not (and (exact-nonnegative-integer? mask)
+ (< mask (expt 2 number-of-event-types))))
+ (error:bad-range-argument mask 'SELECT-USER-EVENTS))
+ (set! user-event-mask mask)
+ unspecific)
+
+(define (os2-graphics/read-user-event device)
+ device
+ (without-thread-events
+ (lambda ()
+ (let loop ()
+ (if (queue-empty? user-event-queue)
+ (begin
+ (if (eq? 'INPUT-AVAILABLE
+ (test-for-input-on-descriptor event-descriptor #t))
+ (read-and-process-event))
+ (loop))
+ (dequeue! user-event-queue))))))
+
+(define (os2-graphics/read-button device)
+ (let ((window (graphics-device/descriptor device))
+ (event
+ (let loop ()
+ (let ((event (os2-graphics/read-user-event device)))
+ (if (and (eq? event-type:button (event-type event))
+ (eq? button-event-type:down (button-event/type event)))
+ event
+ (loop))))))
+ (values (button-event/number event)
+ (window/device->x window (button-event/x event))
+ (window/device->y window (button-event/y event))
+ (event-wid event))))
+
+(define (os2-graphics/discard-events device)
+ device
+ (without-thread-events
+ (lambda ()
+ (let loop ()
+ (flush-queue! user-event-queue)
+ (if (read-and-process-event)
+ (loop))))))
+
+(define (flush-queue! queue)
+ (without-interrupts
+ (lambda ()
+ (let loop ()
+ (if (not (queue-empty? queue))
+ (begin
+ (dequeue!/unsafe queue)
+ (loop)))))))
+
+;;;; Images
+
+(define-structure (image (conc-name image/))
+ ps
+ (width #f read-only #t)
+ (height #f read-only #t)
+ (colormap #f read-only #t))
+
+(define (os2-graphics/set-image-colormap device colormap)
+ ;; Random kludge. The 6.001 picture code assumes that the colormap
+ ;; information is stored in the window, but in OS/2 it should be
+ ;; associated with the image. So this kludge stores the colormap in
+ ;; the window, where it is retrieved when an image is created.
+ (set-window/image-colormap! (graphics-device/descriptor device) colormap))
+
+(define (os2-graphics/capture-image device x-left y-bottom x-right y-top)
+ (let ((window (graphics-device/descriptor device)))
+ (let ((x (window/x->device window x-left))
+ (y (window/y->device window y-bottom)))
+ (let ((width (+ (- (window/x->device window x-right) x) 1))
+ (height (+ (- (window/y->device window y-top) y) 1)))
+ (let ((image (image/create (image-type device) device width height)))
+ (os2ps-bitblt (image/ps (image/descriptor image))
+ (window/backing-store window)
+ (vector x (+ x width) 0)
+ (vector y (+ y height) 0)
+ ROP_SRCCOPY
+ BBO_OR)
+ image)))))
+
+(define (os2-image/create device width height)
+ (create-image (graphics-device/descriptor device) width height))
+
+(define (create-image window width height)
+ (let ((ps (os2ps-create-memory-ps)))
+ (os2ps-set-bitmap ps (os2ps-create-bitmap ps width height))
+ (let ((image (make-image ps width height (window/image-colormap window))))
+ (add-to-protection-list! image-list image ps)
+ image)))
+
+(define (os2-image/destroy image)
+ (destroy-image (image/descriptor image)))
+
+(define (destroy-image image)
+ (if (image/ps image)
+ (begin
+ (destroy-memory-ps (image/ps image))
+ (set-image/ps! image #f)
+ (remove-from-protection-list! image-list image))))
+
+(define (destroy-memory-ps ps)
+ (let ((bitmap (os2ps-set-bitmap ps #f)))
+ (os2ps-destroy-memory-ps ps)
+ (if bitmap
+ (os2ps-destroy-bitmap bitmap))))
+
+(define (os2-image/width image)
+ (image/width (image/descriptor image)))
+
+(define (os2-image/height image)
+ (image/height (image/descriptor image)))
+
+(define (os2-image/fill-from-byte-vector image bytes)
+ (let ((image (image/descriptor image)))
+ (set-bitmap-bits
+ (image/ps image)
+ (let ((width (image/width image))
+ (height (image/height image)))
+ (make-bitmap-info width height 8
+ (image/colormap image)
+ (convert-bitmap-data width height bytes))))))
+
+(define (convert-bitmap-data width height bytes)
+ ;; Convert Scheme bitmap data layout to OS/2 bitmap layout. Scheme
+ ;; layout is row-major with upper-left corner at index zero with no
+ ;; padding. OS/2 layout is row-major with lower-left corner at
+ ;; index zero and rows padded to 32-bit boundaries. This conversion
+ ;; uses the OS/2 standard 8-bit-per-pixel bitmap format.
+ (let ((row-size (* (ceiling (/ (* 8 width) 32)) 4)))
+ (let ((copy (make-string (* row-size height))))
+ (let loop ((from 0) (to (string-length copy)))
+ (if (not (fix:= to 0))
+ (let ((from* (fix:+ from width))
+ (to (fix:- to row-size)))
+ (substring-move-right! bytes from from* copy to)
+ (loop from* to))))
+ copy)))
+
+(define (os2-image/draw device x y image)
+ (let ((window (graphics-device/descriptor device))
+ (image (image/descriptor image)))
+ (draw-image window
+ (window/x->device window x)
+ (window/y->device window y)
+ image
+ 0
+ 0
+ (image/width image)
+ (image/height image))))
+
+(define (os2-image/draw-subimage device x y image
+ image-x image-y image-width image-height)
+ (let ((window (graphics-device/descriptor device))
+ (image (image/descriptor image)))
+ (draw-image window
+ (window/x->device window x)
+ (window/y->device window y)
+ image
+ image-x
+ ;; IMAGE-Y must be inverted because Scheme images have
+ ;; origin in upper left and OS/2 bitmaps have origin
+ ;; in lower left.
+ (- (image/height image) (+ image-y image-height))
+ image-width
+ image-height)))
+
+(define (draw-image window window-x window-y
+ image image-x image-y image-width image-height)
+ (os2ps-bitblt (window/backing-store window)
+ (image/ps image)
+ (vector window-x (+ window-x image-width) image-x)
+ (vector window-y (+ window-y image-height) image-y)
+ ROP_SRCCOPY
+ BBO_OR))
+
+;;;; Bitmap I/O
+
+;;; This code uses the OS/2 C datatype modelling code to manipulate
+;;; OS/2 C data types which are contained in Scheme character strings.
+
+(define (get-bitmap-bits psid n-bits)
+ (if (not (memv n-bits '(1 4 8 24)))
+ (error:bad-range-argument n-bits 'GET-BITMAP-BITS))
+ (maybe-initialize-bitmaps!)
+ (call-with-values (lambda () (get-bitmap-dimensions (os2ps-get-bitmap psid)))
+ (lambda (width height)
+ (let ((info (make-bytes:bitmap-info-2 1 n-bits))
+ (data (make-bytes:bitmap-data width height 1 n-bits)))
+ (let ((n (os2ps-get-bitmap-bits psid 0 height data info)))
+ (if (not (= height n))
+ (error "Only able to read part of bitmap data:" n height)))
+ (bytes->bitmap-info info data)))))
+
+(define (set-bitmap-bits psid info)
+ (maybe-initialize-bitmaps!)
+ (let ((height (bitmap-info/height info)))
+ (call-with-values (lambda () (bitmap-info->bytes info))
+ (lambda (info data)
+ (let ((n (os2ps-set-bitmap-bits psid 0 height data info)))
+ (if (not (= height n))
+ (error "Only able to write part of bitmap data:" n height)))))))
+
+(define bitmaps-initialized? #f)
+(define (maybe-initialize-bitmaps!)
+ (without-interrupts
+ (lambda ()
+ (if (not bitmaps-initialized?)
+ (begin
+ (initialize-c-types!)
+ (define-c-type "USHORT" "unsigned short")
+ (define-c-type "ULONG" "unsigned long")
+ (define-c-type "BITMAPINFOHEADER"
+ '(struct ("ULONG" "cbFix")
+ ("USHORT" "cx")
+ ("USHORT" "cy")
+ ("USHORT" "cPlanes")
+ ("USHORT" "cBitCount")))
+ (define-c-type "BITMAPINFO2"
+ '(struct ("ULONG" "cbFix")
+ ("ULONG" "cx")
+ ("ULONG" "cy")
+ ("USHORT" "cPlanes")
+ ("USHORT" "cBitCount")
+ ("ULONG" "ulCompression")
+ ("ULONG" "cbImage")
+ ("ULONG" "cxResolution")
+ ("ULONG" "cyResolution")
+ ("ULONG" "cclrUsed")
+ ("ULONG" "cclrImportant")
+ ("USHORT" "usUnits")
+ ("USHORT" "usReserved")
+ ("USHORT" "usRecording")
+ ("USHORT" "usRendering")
+ ("ULONG" "cSize1")
+ ("ULONG" "cSize2")
+ ("ULONG" "ulColorEncoding")
+ ("ULONG" "ulIdentifier")
+ ((array "ULONG" 1) "argbColor")))
+ (set! get-bitmap-dimensions (make:get-bitmap-dimensions))
+ (set! bytes->bitmap-info (make:bytes->bitmap-info))
+ (set! bitmap-info->bytes (make:bitmap-info->bytes))
+ (set! make-bytes:bitmap-info-2 (make:make-bytes:bitmap-info-2))
+ (set! bitmaps-initialized? #t)
+ unspecific)))))
+
+(define get-bitmap-dimensions)
+(define (make:get-bitmap-dimensions)
+ (let ((type (lookup-c-type "BITMAPINFOHEADER")))
+ (let ((width (c-number-reader type 0 "cx"))
+ (height (c-number-reader type 0 "cy")))
+ (lambda (bid)
+ (let ((bytes (os2ps-get-bitmap-parameters bid)))
+ (values (width bytes) (height bytes)))))))
+
+(define bytes->bitmap-info)
+(define (make:bytes->bitmap-info)
+ (let ((type (lookup-c-type "BITMAPINFO2")))
+ (let ((width (c-number-reader type 0 "cx"))
+ (height (c-number-reader type 0 "cy"))
+ (n-bits (c-number-reader type 0 "cBitCount"))
+ (get-color (c-array-reader type 0 "argbColor")))
+ (lambda (bytes data)
+ (let ((n-bits (n-bits bytes)))
+ (make-bitmap-info (width bytes)
+ (height bytes)
+ n-bits
+ (if (= n-bits 24)
+ #f
+ (make-initialized-vector (expt 2 n-bits)
+ (lambda (index)
+ (get-color bytes index))))
+ data))))))
+
+(define bitmap-info->bytes)
+(define (make:bitmap-info->bytes)
+ (let ((type (lookup-c-type "BITMAPINFO2")))
+ (let ((set-width! (c-number-writer type 0 "cx"))
+ (set-height! (c-number-writer type 0 "cy"))
+ (set-color! (c-array-writer type 0 "argbColor")))
+ (lambda (info)
+ (let ((n-bits (bitmap-info/n-bits info)))
+ (let ((bytes (make-bytes:bitmap-info-2 1 n-bits)))
+ (set-width! bytes (bitmap-info/width info))
+ (set-height! bytes (bitmap-info/height info))
+ (if (not (= n-bits 24))
+ (let ((n-colors (expt 2 n-bits))
+ (colormap (bitmap-info/colormap info)))
+ (do ((index 0 (fix:+ index 1)))
+ ((fix:= index n-colors))
+ (set-color! bytes index (vector-ref colormap index)))))
+ (values bytes (bitmap-info/data info))))))))
+
+(define-structure (bitmap-info (conc-name bitmap-info/))
+ (width #f read-only #t)
+ (height #f read-only #t)
+ (n-bits #f read-only #t)
+ (colormap #f read-only #t)
+ (data #f read-only #t))
+
+(define (make-bytes:bitmap-data width height n-planes n-bits)
+ (make-string (* (ceiling (/ (* n-bits width) 32)) 4 height n-planes)))
+
+;;; OS2PS-GET-BITMAP-BITS and OS2PS-SET-BITMAP-BITS both require an
+;;; argument of type BITMAPINFO2. On input, this argument specifies
+;;; the external format of the bitmap, which is just the size and
+;;; depth of the information. The colormap information is output from
+;;; OS2PS-GET-BITMAP-BITS and input to OS2PS-SET-BITMAP-BITS.
+
+(define make-bytes:bitmap-info-2)
+(define (make:make-bytes:bitmap-info-2)
+ (let ((type (lookup-c-type "BITMAPINFO2")))
+ (call-with-values (lambda () (select-c-type type 0 "argbColor"))
+ (lambda (rgb-type size-base)
+ (let ((size-increment (c-array-type/element-spacing rgb-type))
+ (set-struct-size! (c-number-writer type 0 "cbFix"))
+ (set-n-planes! (c-number-writer type 0 "cPlanes"))
+ (set-n-bits! (c-number-writer type 0 "cBitCount")))
+ (lambda (n-planes n-bits)
+ (let ((info
+ (make-string (+ size-base
+ (if (= n-bits 24)
+ 0
+ (* size-increment (expt 2 n-bits))))
+ (ascii->char 0))))
+ (set-struct-size! info size-base)
+ (set-n-planes! info n-planes)
+ (set-n-bits! info n-bits)
+ info)))))))
+
;;;; Protection lists
(define (make-protection-list)
--
2.25.1