blob: 0d622621904b6b970924149c1191742d3700b00e [file] [log] [blame]
* Copyright 2020 Google LLC.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "gm/gm.h"
#include "include/effects/SkGradientShader.h"
#include "include/gpu/GrRecordingContext.h"
#include "src/core/SkGpuBlurUtils.h"
#include "src/gpu/GrRecordingContextPriv.h"
#include "src/gpu/GrStyle.h"
#include "src/gpu/SkGr.h"
#include "src/gpu/effects/GrBlendFragmentProcessor.h"
#include "src/image/SkImage_Base.h"
static GrSurfaceProxyView blur(GrRecordingContext* ctx,
GrSurfaceProxyView src,
SkIRect dstB,
SkIRect srcB,
float sigmaX,
float sigmaY,
SkTileMode mode) {
auto resultRTC =
SkGpuBlurUtils::GaussianBlur(ctx, src, GrColorType::kRGBA_8888, kPremul_SkAlphaType,
nullptr, dstB, srcB, sigmaX, sigmaY, mode);
if (!resultRTC) {
return {};
return resultRTC->readSurfaceView();
static void run(GrRecordingContext* rContext, GrSurfaceDrawContext* rtc, bool subsetSrc, bool ref) {
auto srcII = SkImageInfo::Make(60, 60, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
auto surf = SkSurface::MakeRenderTarget(rContext, SkBudgeted::kYes, srcII);
GrSurfaceProxyView src;
if (surf) {
SkScalar w = surf->width();
SkScalar h = surf->height();
SkPaint paint;
// Draw four horizontal lines at 1/8, 1/4, 3/4, 7/8.
surf->getCanvas()->drawLine({0.f, 1.f*h/8.f}, {w, 1.f*h/8.f}, paint);
paint.setColor(/* sea foam */ 0xFF71EEB8);
surf->getCanvas()->drawLine({0.f, 1.f*h/4.f}, {w, 1.f*h/4.f}, paint);
surf->getCanvas()->drawLine({0.f, 3.f*h/4.f}, {w, 3.f*h/4.f}, paint);
surf->getCanvas()->drawLine({0.f, 7.f*h/8.f}, {w, 7.f*h/8.f}, paint);
// Draw four vertical lines at 1/8, 1/4, 3/4, 7/8.
paint.setColor(/* orange */ 0xFFFFA500);
surf->getCanvas()->drawLine({1.f*w/8.f, 0.f}, {1.f*h/8.f, h}, paint);
surf->getCanvas()->drawLine({1.f*w/4.f, 0.f}, {1.f*h/4.f, h}, paint);
surf->getCanvas()->drawLine({3.f*w/4.f, 0.f}, {3.f*h/4.f, h}, paint);
surf->getCanvas()->drawLine({7.f*w/8.f, 0.f}, {7.f*h/8.f, h}, paint);
auto img = surf->makeImageSnapshot();
std::tie(src, std::ignore) = as_IB(img)->asView(rContext, GrMipmapped::kNo);
if (!src) {
SkIRect srcRect = SkIRect::MakeSize(src.dimensions());
if (subsetSrc) {
srcRect = SkIRect::MakeXYWH(2.f*srcRect.width() /8.f,
5.f*srcRect.width() /8.f,
int srcW = srcRect.width();
int srcH = srcRect.height();
// Each set of rects is drawn in one test area so they probably should not abut or overlap
// to visualize the blurs separately.
const std::vector<SkIRect> dstRectSets[] = {
// encloses source bounds.
srcRect.makeOutset(srcW/5, srcH/5)
// partial overlap from above/below.
SkIRect::MakeXYWH(srcRect.x(), srcRect.y() + 3*srcH/4, srcW, srcH),
SkIRect::MakeXYWH(srcRect.x(), srcRect.y() - 3*srcH/4, srcW, srcH)
// adjacent to each side of src bounds.
srcRect.makeOffset( 0, srcH),
srcRect.makeOffset( srcW, 0),
srcRect.makeOffset( 0, -srcH),
srcRect.makeOffset(-srcW, 0),
// fully outside src bounds in one direction.
SkIRect::MakeXYWH(-6.f*srcW/8.f, -7.f*srcH/8.f, 4.f*srcW/8.f, 20.f*srcH/8.f)
SkIRect::MakeXYWH(-1.f*srcW/8.f, -7.f*srcH/8.f, 16.f*srcW/8.f, 2.f*srcH/8.f)
SkIRect::MakeXYWH(10.f*srcW/8.f, -3.f*srcH/8.f, 4.f*srcW/8.f, 16.f*srcH/8.f)
SkIRect::MakeXYWH(-7.f*srcW/8.f, 14.f*srcH/8.f, 18.f*srcW/8.f, 1.f*srcH/8.f)
// outside of src bounds in both directions.
SkIRect::MakeXYWH(-5.f*srcW/8.f, -5.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
SkIRect::MakeXYWH(-5.f*srcW/8.f, 12.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
SkIRect::MakeXYWH(12.f*srcW/8.f, -5.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
SkIRect::MakeXYWH(12.f*srcW/8.f, 12.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
const auto& caps = *rContext->priv().caps();
static constexpr SkScalar kPad = 10;
SkVector trans = {kPad, kPad};
SkIRect testArea = srcRect;
testArea.outset(testArea.width(), testArea.height());
for (const auto& dstRectSet : dstRectSets) {
for (int t = 0; t < kSkTileModeCount; ++t) {
auto mode = static_cast<SkTileMode>(t);
GrSamplerState sampler(SkTileModeToWrapMode(mode), GrSamplerState::Filter::kNearest);
SkMatrix m = SkMatrix::Translate(trans.x() - testArea.x(), trans.y() - testArea.y());
// Draw the src subset in the tile mode faded as a reference before drawing the blur
// on top.
static constexpr float kAlpha = 0.2f;
auto fp = GrTextureEffect::MakeSubset(src, kPremul_SkAlphaType, SkMatrix::I(),
sampler, SkRect::Make(srcRect), caps);
fp = GrFragmentProcessor::ModulateRGBA(std::move(fp),
{kAlpha, kAlpha, kAlpha, kAlpha});
GrPaint paint;
rtc->drawRect(nullptr, std::move(paint), GrAA::kNo, m, SkRect::Make(testArea));
// If we're in ref mode we will create a temp image that has the original image
// tiled into it and then do a clamp blur with adjusted params that should produce
// the same result as the original params.
std::unique_ptr<GrSurfaceDrawContext> refSrc;
SkIRect refRect;
if (ref) {
// Blow up testArea into a much larger rect so that our clamp blur will not
// reach anywhere near the edge of our temp surface.
refRect = testArea.makeOutset(testArea.width(), testArea.height());
refSrc = GrSurfaceDrawContext::Make(rContext, GrColorType::kRGBA_8888, nullptr,
SkBackingFit::kApprox, refRect.size());
// Setup an effect to put the original src rect at the correct logical place
// in the temp where the temp's origin is at the top left of refRect.
SkMatrix tm = SkMatrix::Translate(refRect.left(),;
auto fp = GrTextureEffect::MakeSubset(src, kPremul_SkAlphaType, tm, sampler,
SkRect::Make(srcRect), caps);
GrPaint paint;
refSrc->drawRect(nullptr, std::move(paint), GrAA::kNo, SkMatrix::I(),
// Do a blur for each dstRect in the set over our testArea-sized background.
for (const auto& dstRect : dstRectSet) {
// Setup the normal blur args.
const SkScalar sigmaX = src.width() / 10.f;
const SkScalar sigmaY = src.height() / 10.f;
auto blurSrc = src;
auto blurMode = mode;
auto blurDstRect = dstRect;
auto blurSrcRect = srcRect;
if (ref) {
// Move the dst rect to be relative to our temp surface.
blurDstRect = dstRect.makeOffset(-refRect.topLeft());
// Our new src is the entire temp containing the tiled original.
blurSrcRect = SkIRect::MakeSize(refRect.size());
// This shouldn't really matter because we should have made a large enough
// temp that the edges don't come into play. But this puts us on a simpler
// path through SkGpuBlurUtils.
blurMode = SkTileMode::kClamp;
blurSrc = refSrc->readSurfaceView();
// Blur using the rect and draw on top.
if (auto blurView = blur(rContext, blurSrc, blurDstRect, blurSrcRect,
sigmaX, sigmaY, blurMode)) {
auto fp = GrTextureEffect::Make(blurView, kPremul_SkAlphaType, SkMatrix::I(),
sampler, caps);
GrPaint paint;
// Compose against white (default paint color) and then replace the dst
// (SkBlendMode::kSrc).
fp = GrBlendFragmentProcessor::Make(std::move(fp), /*dst=*/nullptr,
rtc->fillRectToRect(nullptr, std::move(paint), GrAA::kNo, m,
SkRect::Make(dstRect), SkRect::Make(blurView.dimensions()));
// Show the outline of the dst rect. Mostly for kDecal but also allows visual
// confirmation that the resulting blur is the right size and in the right place.
GrPaint paint;
static constexpr float kAlpha = 0.6f;
paint.setColor4f({0, kAlpha, 0, kAlpha});
SkPaint stroke;
GrStyle style(stroke);
auto dstR = SkRect::Make(dstRect).makeOutset(0.5f, 0.5f);
rtc->drawRect(nullptr, std::move(paint), GrAA::kNo, m, dstR, &style);
// Show the rect that's being blurred.
GrPaint paint;
static constexpr float kAlpha = 0.3f;
paint.setColor4f({0, 0, 0, kAlpha});
SkPaint stroke;
GrStyle style(stroke);
auto srcR = SkRect::Make(srcRect).makeOutset(0.5f, 0.5f);
rtc->drawRect(nullptr, std::move(paint), GrAA::kNo, m, srcR, &style);
trans.fX += testArea.width() + kPad;
trans.fX = kPad;
trans.fY += testArea.height() + kPad;
DEF_SIMPLE_GPU_GM(gpu_blur_utils, ctx, rtc, canvas, 765, 955) { run(ctx, rtc, false, false); }
DEF_SIMPLE_GPU_GM(gpu_blur_utils_ref, ctx, rtc, canvas, 765, 955) { run(ctx, rtc, false, true); }
DEF_SIMPLE_GPU_GM(gpu_blur_utils_subset_rect, ctx, rtc, canvas, 485, 730) {
run(ctx, rtc, true, false);
DEF_SIMPLE_GPU_GM(gpu_blur_utils_subset_ref, ctx, rtc, canvas, 485, 730) {
run(ctx, rtc, true, true);