diff options
| -rw-r--r-- | site/user/api/skcanvas.md | 8 | ||||
| -rw-r--r-- | site/user/tips.md | 31 |
2 files changed, 29 insertions, 10 deletions
diff --git a/site/user/api/skcanvas.md b/site/user/api/skcanvas.md index 98d7f7fbcc..5750814963 100644 --- a/site/user/api/skcanvas.md +++ b/site/user/api/skcanvas.md @@ -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 diff --git a/site/user/tips.md b/site/user/tips.md index 9b86bf1b4c..6357c80e3f 100644 --- a/site/user/tips.md +++ b/site/user/tips.md @@ -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 |