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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
in float sigma;
layout(ctype=SkRect) in float4 rect;
in uniform float cornerRadius;
in uniform sampler2D ninePatchSampler;
layout(ctype=SkRect) uniform float4 proxyRect;
uniform half blurRadius;
@header {
#include "GrClip.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrPaint.h"
#include "GrProxyProvider.h"
#include "GrRenderTargetContext.h"
#include "GrStyle.h"
#include "SkBlurMaskFilter.h"
#include "SkBlurPriv.h"
#include "SkGpuBlurUtils.h"
#include "SkRRectPriv.h"
}
@class {
static sk_sp<GrTextureProxy> find_or_create_rrect_blur_mask(GrContext* context,
const SkRRect& rrectToDraw,
const SkISize& size,
float xformedSigma) {
static const GrUniqueKey::Domain kDomain = GrUniqueKey::GenerateDomain();
GrUniqueKey key;
GrUniqueKey::Builder builder(&key, kDomain, 9, "RoundRect Blur Mask");
builder[0] = SkScalarCeilToInt(xformedSigma-1/6.0f);
int index = 1;
for (auto c : { SkRRect::kUpperLeft_Corner, SkRRect::kUpperRight_Corner,
SkRRect::kLowerRight_Corner, SkRRect::kLowerLeft_Corner }) {
SkASSERT(SkScalarIsInt(rrectToDraw.radii(c).fX) &&
SkScalarIsInt(rrectToDraw.radii(c).fY));
builder[index++] = SkScalarCeilToInt(rrectToDraw.radii(c).fX);
builder[index++] = SkScalarCeilToInt(rrectToDraw.radii(c).fY);
}
builder.finish();
GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();
sk_sp<GrTextureProxy> mask(proxyProvider->findOrCreateProxyByUniqueKey(
key, kBottomLeft_GrSurfaceOrigin));
if (!mask) {
// TODO: this could be approx but the texture coords will need to be updated
sk_sp<GrRenderTargetContext> rtc(
context->contextPriv().makeDeferredRenderTargetContextWithFallback(
SkBackingFit::kExact, size.fWidth, size.fHeight,
kAlpha_8_GrPixelConfig, nullptr));
if (!rtc) {
return nullptr;
}
GrPaint paint;
rtc->clear(nullptr, 0x0, GrRenderTargetContext::CanClearFullscreen::kYes);
rtc->drawRRect(GrNoClip(), std::move(paint), GrAA::kYes, SkMatrix::I(), rrectToDraw,
GrStyle::SimpleFill());
sk_sp<GrTextureProxy> srcProxy(rtc->asTextureProxyRef());
if (!srcProxy) {
return nullptr;
}
sk_sp<GrRenderTargetContext> rtc2(
SkGpuBlurUtils::GaussianBlur(context,
std::move(srcProxy),
nullptr,
SkIRect::MakeWH(size.fWidth, size.fHeight),
SkIRect::EmptyIRect(),
xformedSigma,
xformedSigma,
GrTextureDomain::kIgnore_Mode,
kPremul_SkAlphaType,
SkBackingFit::kExact));
if (!rtc2) {
return nullptr;
}
mask = rtc2->asTextureProxyRef();
if (!mask) {
return nullptr;
}
SkASSERT(mask->origin() == kBottomLeft_GrSurfaceOrigin);
proxyProvider->assignUniqueKeyToProxy(key, mask.get());
}
return mask;
}
}
@optimizationFlags {
kCompatibleWithCoverageAsAlpha_OptimizationFlag
}
@make {
static std::unique_ptr<GrFragmentProcessor> Make(GrContext* context, float sigma,
float xformedSigma,
const SkRRect& srcRRect,
const SkRRect& devRRect);
}
@cpp {
std::unique_ptr<GrFragmentProcessor> GrRRectBlurEffect::Make(GrContext* context, float sigma,
float xformedSigma,
const SkRRect& srcRRect,
const SkRRect& devRRect) {
SkASSERT(!SkRRectPriv::IsCircle(devRRect) && !devRRect.isRect()); // Should've been caught up-stream
// TODO: loosen this up
if (!SkRRectPriv::IsSimpleCircular(devRRect)) {
return nullptr;
}
// Make sure we can successfully ninepatch this rrect -- the blur sigma has to be
// sufficiently small relative to both the size of the corner radius and the
// width (and height) of the rrect.
SkRRect rrectToDraw;
SkISize size;
SkScalar ignored[kSkBlurRRectMaxDivisions];
int ignoredSize;
uint32_t ignored32;
bool ninePatchable = SkComputeBlurredRRectParams(srcRRect, devRRect,
SkRect::MakeEmpty(),
sigma, xformedSigma,
&rrectToDraw, &size,
ignored, ignored,
ignored, ignored,
&ignoredSize, &ignoredSize,
&ignored32);
if (!ninePatchable) {
return nullptr;
}
sk_sp<GrTextureProxy> mask(find_or_create_rrect_blur_mask(context, rrectToDraw,
size, xformedSigma));
if (!mask) {
return nullptr;
}
return std::unique_ptr<GrFragmentProcessor>(
new GrRRectBlurEffect(xformedSigma, devRRect.getBounds(),
SkRRectPriv::GetSimpleRadii(devRRect).fX, std::move(mask)));
}
}
@test(d) {
SkScalar w = d->fRandom->nextRangeScalar(100.f, 1000.f);
SkScalar h = d->fRandom->nextRangeScalar(100.f, 1000.f);
SkScalar r = d->fRandom->nextRangeF(1.f, 9.f);
SkScalar sigma = d->fRandom->nextRangeF(1.f,10.f);
SkRRect rrect;
rrect.setRectXY(SkRect::MakeWH(w, h), r, r);
return GrRRectBlurEffect::Make(d->context(), sigma, sigma, rrect, rrect);
}
void main() {
// warp the fragment position to the appropriate part of the 9patch blur texture
half2 rectCenter = (proxyRect.xy + proxyRect.zw) / 2.0;
half2 translatedFragPos = sk_FragCoord.xy - proxyRect.xy;
half threshold = cornerRadius + 2.0 * blurRadius;
half2 middle = proxyRect.zw - proxyRect.xy - 2.0 * threshold;
if (translatedFragPos.x >= threshold && translatedFragPos.x < (middle.x + threshold)) {
translatedFragPos.x = threshold;
} else if (translatedFragPos.x >= (middle.x + threshold)) {
translatedFragPos.x -= middle.x - 1.0;
}
if (translatedFragPos.y > threshold && translatedFragPos.y < (middle.y+threshold)) {
translatedFragPos.y = threshold;
} else if (translatedFragPos.y >= (middle.y + threshold)) {
translatedFragPos.y -= middle.y - 1.0;
}
half2 proxyDims = half2(2.0 * threshold + 1.0);
half2 texCoord = translatedFragPos / proxyDims;
sk_OutColor = sk_InColor * texture(ninePatchSampler, texCoord);
}
@setData(pdman) {
float blurRadiusValue = 3.f * SkScalarCeilToScalar(sigma - 1 / 6.0f);
pdman.set1f(blurRadius, blurRadiusValue);
SkRect outset = rect;
outset.outset(blurRadiusValue, blurRadiusValue);
pdman.set4f(proxyRect, outset.fLeft, outset.fTop, outset.fRight, outset.fBottom);
}
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