diff options
| -rw-r--r-- | gm/imagefilters.cpp | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/gm/imagefilters.cpp b/gm/imagefilters.cpp index 1998014bbf..af2c776ce1 100644 --- a/gm/imagefilters.cpp +++ b/gm/imagefilters.cpp @@ -6,8 +6,11 @@ */ #include "gm.h" -#include "SkImageFilter.h" +#include "SkBlurImageFilter.h" #include "SkColorMatrixFilter.h" +#include "SkImage.h" +#include "SkImageFilter.h" +#include "SkSurface.h" /** * Test drawing a primitive w/ an imagefilter (in this case, just matrix w/ identity) to see @@ -62,3 +65,41 @@ DEF_SIMPLE_GM(imagefilters_xfermodes, canvas, 480, 480) { canvas->translate(0, 240); } } + +static SkImage* make_image(SkCanvas* canvas) { + const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); + SkAutoTUnref<SkSurface> surface(canvas->newSurface(info)); + if (!surface) { + surface.reset(SkSurface::NewRaster(info)); + } + surface->getCanvas()->drawRect(SkRect::MakeXYWH(25, 25, 50, 50), SkPaint()); + return surface->newImageSnapshot(); +} + +// Compare blurs when we're tightly clipped (fast) and not as tightly (slower) +// +// Expect the two to draw the same (modulo the extra border of pixels when the clip is larger) +// +DEF_SIMPLE_GM(fast_slow_blurimagefilter, canvas, 620, 260) { + SkAutoTUnref<SkImage> image(make_image(canvas)); + const SkRect r = SkRect::MakeIWH(image->width(), image->height()); + + canvas->translate(10, 10); + for (SkScalar sigma = 8; sigma <= 128; sigma *= 2) { + SkPaint paint; + paint.setImageFilter(SkBlurImageFilter::Create(sigma, sigma))->unref(); + + canvas->save(); + // we outset the clip by 1, to fall out of the fast-case in drawImage + // i.e. the clip is larger than the image + for (SkScalar outset = 0; outset <= 1; ++outset) { + canvas->save(); + canvas->clipRect(r.makeOutset(outset, outset)); + canvas->drawImage(image, 0, 0, &paint); + canvas->restore(); + canvas->translate(0, r.height() + 20); + } + canvas->restore(); + canvas->translate(r.width() + 20, 0); + } +} |