[Commit] papers/twin-ols2005/twin-talk Makefile, NONE,
1.1 clipboard.png, NONE, 1.1 clipboard.svg, NONE,
1.1 glyph.svg, NONE, 1.1 hershey.svg, NONE, 1.1 hint.svg, NONE,
1.1 itsy.png, NONE, 1.1 itsy.svg, NONE, 1.1 talk-title.svg,
NONE, 1.1 talk.svg, NONE, 1.1 twin-logo.svg, NONE,
1.1 twin.xml, NONE, 1.1
Keith Packard
commit at keithp.com
Wed Jul 20 00:54:03 PDT 2005
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Committed by: keithp
Update of /local/src/CVS/papers/twin-ols2005/twin-talk
In directory home.keithp.com:/tmp/cvs-serv11221
Added Files:
Makefile clipboard.png clipboard.svg glyph.svg hershey.svg
hint.svg itsy.png itsy.svg talk-title.svg talk.svg
twin-logo.svg twin.xml
Log Message:
Add twin ols slides
--- NEW FILE: Makefile ---
PROJ=twin
THEME=talk
IMAGES=clipboard.svg glyph.svg hershey.svg hint.svg itsy.svg
TEMPLATES=${THEME}.svg ${THEME}-title.svg
all: ${PROJ}-index.xml ${PROJ}.pdf ${PROJ}-001.png
${PROJ}-index.xml: ${PROJ}.xml ${TEMPLATES} ${IMAGES}
svgslides ${PROJ}.xml
${PROJ}.pdf: ${PROJ}-index.xml
svgslides-output $< $@
${PROJ}-001.png: ${PROJ}-index.xml
for i in ${PROJ}-*.svg; do \
svg2png --width=800 $$i > `basename $$i .svg`.png; \
done
clean:
rm -f ${PROJ}-index.xml ${PROJ}.pdf index.html ${PROJ}-???.png ${PROJ}-???.html ${PROJ}-???.svg *~
--- NEW FILE: clipboard.png ---
(This appears to be a binary file; contents omitted.)
--- NEW FILE: clipboard.svg ---
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
width="450" version="1.0" height="357">
<g>
<image x="0" y="0" width="450" height="357"
xlink:href="clipboard.png" />
</g>
</svg>
--- NEW FILE: glyph.svg ---
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg version="1.0" width="210" height="110"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
>
<g transform="scale(0.5,0.5)">
<!-- original hershey ampersand -->
<g transform="scale(9,9) translate(11.5,13.5)"
style="stroke-width:2;
stroke-linejoin:round;
stroke-linecap:round;
fill:none;stroke:#000000;">
<path d="M 10, -3
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L 6, -2
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</g>
</g>
<g transform="scale(0.5,0.5) translate(210,0)">
<!-- twin ampersand derived from hershey ampersand -->
<g transform="scale(4.5,4.5) translate(3,45.5)"
style="stroke-width:4;
stroke-linejoin:round;
stroke-linecap:round;
fill:none;stroke:#000000;">
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C 22, -45, 10, -45, 10, -34
C 10, -27, 25, 0, 36, 0
C 39, 0, 40, -1, 40, -4"/>
</g>
</g>
</svg>
--- NEW FILE: hershey.svg ---
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<svg xmlns="http://www.w3.org/2000/svg"
xmlns:sodipodi="http://inkscape.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:ss="http://www.svgslides.org/svgslides0.1"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://web.resource.org/cc/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="532"
font-family="Frutiger" height="318">
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--- NEW FILE: hint.svg ---
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<svg version="1.0" width="335" height="240"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
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<!-- twin B -->
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<g transform="scale(4.5,4.5) translate(5,45.5)">
<!-- pixel grid -->
<g style="stroke-width:0.125;
fill:none;
stroke:#000000;
stroke-dasharray:1,1;">
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<!-- letter -->
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<!-- hints -->
<g style="stroke-width:0.125;
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<!-- X hints -->
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<!-- Y hints -->
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</g>
</g>
<!-- twin B -->
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<!-- letter -->
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--- NEW FILE: itsy.png ---
(This appears to be a binary file; contents omitted.)
--- NEW FILE: itsy.svg ---
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xmlns:xlink="http://www.w3.org/1999/xlink"
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--- NEW FILE: talk-title.svg ---
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<ul>
<lc>An Even Smaller Window System</lc>
<lc>For Even Smaller Devices</lc>
<lc></lc>
<lc>Keith Packard</lc>
<lc>freedesktop.org</lc>
<lc>keithp at keithp.com</lc>
</ul>
</slide>
<slide title="Motivation">
<ul>
<li>Sub-PDA devices</li>
<li>Fast CPUs, tiny memory, tiny screens</li>
<li>e.g. TI TMS 320 DSP</li>
<ul>
<li>200MHz CPU</li>
<li>384K RAM</li>
<li>8M Flash</li>
</ul>
</ul>
<img src="clipboard.svg"
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<slide title="Embedded X Applications">
<ul>
<li>16 MB memory</li>
<li>4 MB flash</li>
<li>200MHz CPU</li>
<li>200 × 320 LCD</li>
</ul>
<img src="itsy.svg"
x="1.0" y="0.5" x-align="right" y-align="center"/>
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<slide title="Twin Assumptions">
<ul>
<li>External frame buffers very slow</li>
<li>No significant acceleration</li>
<li>Color screens only</li>
<li>Reasonable CPU performance</li>
</ul>
</slide>
<slide title="Requirements">
<ul>
<li>X + cairo + gtk+</li>
<li>50Kb memory</li>
<li>Scalable, proportional text</li>
</ul>
</slide>
<slide title="Limiting Features">
<ul>
<li>No external window manager</li>
<li>Reduced operator space</li>
<li>Limited image formats</li>
</ul>
</slide>
<slide title="Windowing">
<ul>
<li>Composited, just like X</li>
<li>Windows drawn to off-screen pixmaps</li>
<li>RGB and ARGB windows supported</li>
<li>Built-in compositing, not external</li>
<li>2D, not 3D</li>
</ul>
</slide>
<slide title="Rendering">
<ul>
<li>Looks like the X render extension</li>
<li>Porter/Duff Compositing (like PDF, GL, etc)</li>
<li>Plan-9 style composing function</li>
<li>dest = (src IN mask) OVER|SOURCE dst</li>
</ul>
</slide>
<slide title="Geometry">
<ul>
<li>PostScript based, like cairo</li>
<li>Build paths, then stroke or fill</li>
<li>Paths scan-converted right from polygons</li>
<li>Affine transformations</li>
</ul>
</slide>
<slide title="Coordinates">
<ul>
<li>User space: 16.16 fixed</li>
<li>Device space: 12.4 fixed</li>
<li>Yes, devices are limited to 4096 pixels</li>
</ul>
</slide>
<slide title="Stroking Lines">
<ul>
<li>Stroking algorithm borrowed for cairo</li>
<li>Exposed as general convolution function</li>
<li>Caps, join styles implemented cheaply</li>
</ul>
</slide>
<slide title="Text">
<ul>
<li>Bitmaps are ugly</li>
<li>Outlines are large and slow</li>
<li>Strokes are small, fast and scalable</li>
</ul>
</slide>
<slide title="Glyph Origin">
<ul>
<li>Dr. A. V. Hershey worked at U.S NBS</li>
<li>Designed glyphs for pen plotters</li>
<li>Glyphs formed from line segments</li>
</ul>
<img src="hershey.svg"
x="1.0" x-align="right"
y="1.0" y-align="bottom"/>
</slide>
<slide title="Glyph Changes">
<ul>
<li>Fitted curved portions with splines</li>
<li>Extended to cover all of ASCII</li>
<li>Compiles to 3840 bytes</li>
<li>Provides roman, oblique, bold and bold-oblique</li>
</ul>
<img src="glyph.svg"
x="0.0" x-align="left"
y="1.0" y-align="bottom"/>
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<slide title="Input Model">
<ul>
<li>Fixed Mouse Model</li>
<li>Events delivered only to containing window</li>
<li>Mouse grabbed while button down</li>
<li>Containment defined by non-translucence</li>
<li>Keyboard focus explicit</li>
</ul>
</slide>
<slide title="Toolkit Model">
<ul>
<li>One screen, which contains</li>
<li>Many windows, which contain</li>
<li>One top-level widget, which contains</li>
<li>One box, which contains</li>
<li>Many boxes and widgets, the boxes contain</li>
<li>More boxes and widgets</li>
</ul>
</slide>
<slide title="Event Model">
<ul>
<li>Events dispatched immediately, no queue</li>
<li>Dispatched down the toolkit stack</li>
<li>Each level dispatches itself</li>
</ul>
</slide>
<slide title="Layout">
<ul>
<li>Boxes & Glue</li>
<li>Widgets and boxes have size and stretch</li>
<li>Widgets have natural size</li>
<li>Can compute natural application size</li>
</ul>
</slide>
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