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NOTRY=true
DOCS_PREVIEW= https://skia.org/user/api/skcanvas?cl=1228063002
DOCS_PREVIEW= https://skia.org/user/tips?cl=1228063002
TBR=

Review URL: https://codereview.chromium.org/1228063002
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halcanary 2015-07-09 06:58:06 -07:00 committed by Commit bot
parent 9cc1775e72
commit 8d3f7bde94
2 changed files with 29 additions and 10 deletions
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8
site/user/api/skcanvas.md
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@ -50,15 +50,17 @@ SkPaint.
void draw(SkCanvas* canvas) {
canvas->save();
canvas->translate(SkIntToScalar(128), SkIntToScalar(128));
canvas->rotate(SkIntToScalar(45));
SkRect rect = SkRect::MakeXYWH(150, -50, 100, 100);
SkRect rect = SkRect::MakeXYWH(-90.5f, -90.5f, 181.0f, 181.0f);
SkPaint paint;
paint.setColor(SK_ColorBLUE);
canvas->drawRect(rect, paint);
canvas->restore();
}
<a href="https://fiddle.skia.org/c/71f2e87df2be1cdbc44139ee3e2790eb">
<img src="https://fiddle.skia.org/i/71f2e87df2be1cdbc44139ee3e2790eb_raster.png"></a>
<a href="https://fiddle.skia.org/c/6af99894b40ea1331f6a79d55a4cbfd7">
<img src="https://fiddle.skia.org/i/6af99894b40ea1331f6a79d55a4cbfd7_raster.png"></a>
The code above will draw a rectangle rotated by 45 degrees. Exactly
what color and style the rect will be drawn in is described by the

31
site/user/tips.md
View File

@ -4,6 +4,8 @@ Tips & FAQ
Tips and Tricks
---------------
<span id="bitmap-subsetting"></span>
### Bitmap Subsetting
Taking a subset of a bitmap is effectively free - no pixels are copied or
@ -16,32 +18,43 @@ drawBitmapNine():
bitmap.extractSubset(&subset, rect);
canvas->drawBitmapNine(subset, ...);
* * *
<span id="skp-capture"></span>
### Capturing a `.skp` file on a web page in Chromium.
1. Launch Chrome or Chromium with `--no-sandbox --enable-gpu-benchmarking`
2. Open the JS console (ctrl-shift-J)
3. Execute: `chrome.gpuBenchmarking.printToSkPicture('/tmp')`
This returns "undefined" on success.
Open the resulting file in the Skia Debugger:
Open the resulting file in the Skia Debugger, rasterize it with `dm`,
or use Skia's `SampleApp` to view it:
<!--?prettify lang=sh?-->
bin/sync-and-gyp
ninja -C out/Release debugger
ninja -C out/Release debugger dm SampleApp
out/Release/debugger /tmp/layer_0.skp &
Or use `dm` to rasterize it.
bin/sync-and-gyp
ninja -C out/Release dm
out/Release/dm --src skp --skps /tmp/layer_0.skp -w /tmp \
--config 8888 gpu pdf --verbose
ls -l /tmp/*/skp/layer_0.skp.*
out/Release/SampleApp --picture /tmp/layer_0.skp
# On MacOS, SampleApp is a bundle:
open out/Release/SampleApp.app --args --picture /tmp/layer_0.skp
* * *
FAQ
---
### Does Skia support HW acceleration?
<span id="hw-acceleration"></span>
### Does Skia support HW acceleration?
There are two ways Skia can take advantage of HW.
@ -57,6 +70,10 @@ There are sets of bottleneck routines inside the blits of Skia that can be
replace on a platform in order to take advantage of specific CPU features. One
such example is the NEON SIMD instructions on ARM v7 devices. See src/opts/
* * *
<span id="font-hinting"></span>
### Does Skia support Font hinting?
Skia has a built-in font cache, but it does not know how to actual render font