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Fix analytic shadows when rotated 180 degrees.

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A 180 degree rotation matrix is functionally like a scale matrix, but
the elements are negative. To compensate for this, we use abs().

Bug: b/137547660
Change-Id: Ib0e7449872523af024e7de9005b9bb70743e04b5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/229394
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
This commit is contained in:
Jim Van Verth 2019-07-24 14:46:53 -04:00 committed by Skia Commit-Bot
parent fa3305ae3f
commit eda9a55baa
2 changed files with 11 additions and 1 deletions
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10
gm/shadowutils.cpp
View File

@ -96,6 +96,7 @@ void draw_paths(SkCanvas* canvas, ShadowMode mode) {
m->postScale(1.2f, 0.8f, 25.f, 25.f);
for (auto& m : matrices) {
for (int flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) {
int pathCounter = 0;
for (const auto& path : paths) {
SkRect postMBounds = path.getBounds();
m.mapRect(&postMBounds);
@ -112,6 +113,11 @@ void draw_paths(SkCanvas* canvas, ShadowMode mode) {
canvas->save();
canvas->concat(m);
// flip a couple of paths to test 180° rotation
if (kTransparentOccluder_ShadowFlag == flags && 0 == pathCounter % 3) {
canvas->save();
canvas->rotate(180, 25, 25);
}
if (kDebugColorNoOccluders == mode || kDebugColorOccluders == mode) {
draw_shadow(canvas, path, kHeight, SK_ColorRED, lightPos, kLightR,
true, flags);
@ -143,11 +149,15 @@ void draw_paths(SkCanvas* canvas, ShadowMode mode) {
paint.setStyle(SkPaint::kFill_Style);
}
canvas->drawPath(path, paint);
if (kTransparentOccluder_ShadowFlag == flags && 0 == pathCounter % 3) {
canvas->restore();
}
canvas->restore();
canvas->translate(dx, 0);
x += dx;
dy = SkTMax(dy, postMBounds.height() + kPad + kHeight);
++pathCounter;
}
}
}

2
src/gpu/GrRenderTargetContext.cpp
View File

@ -1139,7 +1139,7 @@ bool GrRenderTargetContext::drawFastShadow(const GrClip& clip,
// 1/scale
SkScalar devToSrcScale = viewMatrix.isScaleTranslate() ?
SkScalarInvert(viewMatrix[SkMatrix::kMScaleX]) :
SkScalarInvert(SkScalarAbs(viewMatrix[SkMatrix::kMScaleX])) :
sk_float_rsqrt(viewMatrix[SkMatrix::kMScaleX] * viewMatrix[SkMatrix::kMScaleX] +
viewMatrix[SkMatrix::kMSkewX] * viewMatrix[SkMatrix::kMSkewX]);