/usr/share/gnu-smalltalk/examples/CairoBlit.st is in gnu-smalltalk-common 3.2.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | "======================================================================
|
| Blitting example using Cairo and SDL
|
|
======================================================================"
"======================================================================
|
| Copyright 2008 Free Software Foundation, Inc.
| Written by Tony Garnock-Jones.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 2, or (at your option) any later version.
|
| GNU Smalltalk 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 General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
======================================================================"
PackageLoader fileInPackage: #CairoSDL.
PackageLoader fileInPackage: #'LibSDL_GL'.
SDL.SdlEventHandler subclass: BlitDemo [
<import: SDL>
winningDirectAccess [
| color |
SdlDisplay current critical: [
color := SdlDisplay current mapRed: 100 green: 200 blue: 255.
SdlDisplay current fillRect: (0@0 extent: SdlDisplay current extent) color: color].
SdlDisplay current flip.
]
run [
SdlDisplay current: SdlGLDisplay new.
SdlDisplay current eventSource handler: self; startEventLoop.
Processor activeProcess terminateOnQuit.
SdlDisplay current isGLDisplay ifFalse: [ self winningDirectAccess ].
self blitStuff.
]
randomColorComponent [
^ ((Random between: 0 and: 255) / 255) asFloat
]
transparentFill: surface [
"Just an example that would allow showing other OpenGL stuff behind
the Cairo graphics."
surface withContextDo: [ :context |
context
operator: #source;
sourceRed: 0 green: 0 blue: 0 alpha: 0;
paint;
operator: #over ].
]
blitStuff [
| maxw maxh x y w h startTime count surface frameRects |
startTime := Time millisecondClock.
surface := Cairo.CairoSdlSurface on: SdlDisplay current.
count := 0.
maxw := SdlDisplay current extent x.
maxh := SdlDisplay current extent y.
frameRects := SdlDisplay current isGLDisplay ifTrue: [1] ifFalse: [100].
SdlDisplay current isGLDisplay ifTrue: [ self transparentFill: surface ].
[
surface withContextDo: [ :context |
frameRects timesRepeat: [
x := Random between: 0 and: maxw.
y := Random between: 0 and: maxh.
w := Random between: 0 and: maxw - x.
h := Random between: 0 and: maxh - y.
count := count + 1.
context
sourceRed: self randomColorComponent
green: self randomColorComponent
blue: self randomColorComponent;
fill: [ context rectangle: (x@y extent: w@h)]]].
count \\ 100 == 0 ifTrue: [
Transcript << count << ' frames, '
<< (count / ((Time millisecondClock - startTime) / 1000.0))
<< ' fps'; nl.
Processor yield ].
] repeat.
]
handleQuit [
(ObjectMemory snapshot: 'demo.im') ifFalse: [
"false -> not resuming"
Transcript << 'about to quit after snapshot'; nl.
ObjectMemory quit].
]
]
Eval [
s := Semaphore new.
[BlitDemo new run. s signal] fork.
s wait
]
|