rounded rect limitation if half of the strokewidth is greater than radius

[Suyambulingam R M]

rounded rects are not drawn if half of the strokewidth is greater than its radius.

Simple snippet to re-produce the issue.
line_width = 9;
skia_paint->setStrokeWidth(line_width);
skia_canvas->drawRoundRect(rect, 4.0, 4.0, *(ctx->skia_paint).

Attached is the expected output and actual output when rounded rects of size 100,40 with radius 4.0 drawn with stroke width 9.

.

Attaching the expected and actual outputs of caskbench-skia's roundedrect test also.
Rounded rects of size 100,40 with radius 4.0 are drawn at different x,y positions with stroke width ranging from 1-64. In actual output only roundedrects with stroke width <= 8 are drawn.

The issue is observed in PC with mesa 9.1.2 and 10.0 drivers with egl surface.

[Suyambulingam R M]

Adding more observations,
It seems the roundedrect implementation is fine for all stroke widths. Skia uses a different flow to draw rounded rect if stroke width is greater than twice of radius.
It uses SWPathRender in that case. (./src/gpu/GrSoftwarePathRenderer.cpp onDrawPath() ). It fails while creating textures.
This issue is very much related to Issue #6 (#6) .

If fStencilbit is set to 0 and fSampleCount is set to 4. The scenario works fine.

Thanks,
Suyambu

[Suyambulingam R M]

Works fine with fSampleCount=4 and fStencilBit=8.
Closing the issue.