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/*
* 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/SkCanvasPriv.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/gpu/effects/GrTextureEffect.h"
#include "src/gpu/v1/SurfaceDrawContext_v1.h"
#include "src/image/SkImage_Base.h"
namespace {
static GrSurfaceProxyView blur(GrRecordingContext* ctx,
GrSurfaceProxyView src,
SkIRect dstB,
SkIRect srcB,
float sigmaX,
float sigmaY,
SkTileMode mode) {
auto resultSDC = SkGpuBlurUtils::GaussianBlur(ctx,
src,
GrColorType::kRGBA_8888,
kPremul_SkAlphaType,
nullptr,
dstB,
srcB,
sigmaX,
sigmaY,
mode);
if (!resultSDC) {
return {};
}
return resultSDC->readSurfaceView();
};
// Performs tiling first of the src into dst bounds with a surrounding skirt so the blur can use
// clamp. Does repeated blurs rather than invoking downsampling.
static GrSurfaceProxyView slow_blur(GrRecordingContext* rContext,
GrSurfaceProxyView src,
SkIRect dstB,
SkIRect srcB,
float sigmaX,
float sigmaY,
SkTileMode mode) {
auto tileInto = [rContext](GrSurfaceProxyView src,
SkIRect srcTileRect,
SkISize resultSize,
SkIPoint offset,
SkTileMode mode) {
GrImageInfo info(GrColorType::kRGBA_8888, kPremul_SkAlphaType, nullptr, resultSize);
auto sfc = rContext->priv().makeSFC(info);
if (!sfc) {
return GrSurfaceProxyView{};
}
GrSamplerState sampler(SkTileModeToWrapMode(mode), SkFilterMode::kNearest);
auto fp = GrTextureEffect::MakeSubset(src,
kPremul_SkAlphaType,
SkMatrix::Translate(-offset.x(), -offset.y()),
sampler,
SkRect::Make(srcTileRect),
*rContext->priv().caps());
sfc->fillWithFP(std::move(fp));
return sfc->readSurfaceView();
};
SkIPoint outset = {SkGpuBlurUtils::SigmaRadius(sigmaX), SkGpuBlurUtils::SigmaRadius(sigmaY)};
SkISize size = {dstB.width() + 2*outset.x(), dstB.height() + 2*outset.y()};
src = tileInto(std::move(src), srcB, size, outset - dstB.topLeft(), mode);
if (!src) {
return {};
}
dstB = SkIRect::MakePtSize(outset, dstB.size());
while (sigmaX || sigmaY) {
float stepX = sigmaX;
if (stepX > SkGpuBlurUtils::kMaxSigma) {
stepX = SkGpuBlurUtils::kMaxSigma;
// A blur of sigma1 followed by a blur of sigma2 is equiv. to a single blur of
// sqrt(sigma1^2 + sigma2^2).
sigmaX = sqrt(sigmaX*sigmaX - SkGpuBlurUtils::kMaxSigma*SkGpuBlurUtils::kMaxSigma);
} else {
sigmaX = 0.f;
}
float stepY = sigmaY;
if (stepY > SkGpuBlurUtils::kMaxSigma) {
stepY = SkGpuBlurUtils::kMaxSigma;
sigmaY = sqrt(sigmaY*sigmaY- SkGpuBlurUtils::kMaxSigma*SkGpuBlurUtils::kMaxSigma);
} else {
sigmaY = 0.f;
}
auto bounds = SkIRect::MakeSize(src.dimensions());
auto sdc = SkGpuBlurUtils::GaussianBlur(rContext,
std::move(src),
GrColorType::kRGBA_8888,
kPremul_SkAlphaType,
nullptr,
bounds,
bounds,
stepX,
stepY,
SkTileMode::kClamp);
if (!sdc) {
return {};
}
src = sdc->readSurfaceView();
}
// We have o use the original mode here because we may have only blurred in X or Y and then
// the other dimension was not expanded.
auto srcRect = SkIRect::MakeSize(src.dimensions());
return tileInto(std::move(src), srcRect, dstB.size(), -outset, SkTileMode::kClamp);
};
// Makes a src texture for as a source for blurs. If 'contentArea' then the content will
// be in that rect, the 1-pixel surrounding border will be transparent black, and red outside of
// that. Otherwise, the content fills the dimensions.
GrSurfaceProxyView make_src_image(GrRecordingContext* rContext,
SkISize dimensions,
const SkIRect* contentArea = nullptr) {
auto srcII = SkImageInfo::Make(dimensions, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
auto surf = SkSurface::MakeRenderTarget(rContext, SkBudgeted::kYes, srcII);
if (!surf) {
return {};
}
float w, h;
if (contentArea) {
surf->getCanvas()->clear(SK_ColorRED);
surf->getCanvas()->clipIRect(contentArea->makeOutset(1, 1));
surf->getCanvas()->clear(SK_ColorTRANSPARENT);
surf->getCanvas()->clipIRect(*contentArea);
surf->getCanvas()->translate(contentArea->top(), contentArea->left());
w = contentArea->width();
h = contentArea->height();
} else {
w = dimensions.width();
h = dimensions.height();
}
surf->getCanvas()->drawColor(SK_ColorDKGRAY);
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
// Draw four horizontal lines at 1/8, 1/4, 3/4, 7/8.
paint.setStrokeWidth(h/12.f);
paint.setColor(SK_ColorRED);
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);
paint.setColor(SK_ColorYELLOW);
surf->getCanvas()->drawLine({0.f, 3.f*h/4.f}, {w, 3.f*h/4.f}, paint);
paint.setColor(SK_ColorCYAN);
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.setStrokeWidth(w/12.f);
paint.setColor(/* orange */ 0xFFFFA500);
surf->getCanvas()->drawLine({1.f*w/8.f, 0.f}, {1.f*h/8.f, h}, paint);
paint.setColor(SK_ColorBLUE);
surf->getCanvas()->drawLine({1.f*w/4.f, 0.f}, {1.f*h/4.f, h}, paint);
paint.setColor(SK_ColorMAGENTA);
surf->getCanvas()->drawLine({3.f*w/4.f, 0.f}, {3.f*h/4.f, h}, paint);
paint.setColor(SK_ColorGREEN);
surf->getCanvas()->drawLine({7.f*w/8.f, 0.f}, {7.f*h/8.f, h}, paint);
auto img = surf->makeImageSnapshot();
auto [src, ct] = as_IB(img)->asView(rContext, GrMipmapped::kNo);
return src;
}
} // namespace
namespace skiagm {
static GM::DrawResult run(GrRecordingContext* rContext, SkCanvas* canvas, SkString* errorMsg,
bool subsetSrc, bool ref) {
GrSurfaceProxyView src = make_src_image(rContext, {60, 60});
if (!src) {
*errorMsg = "Failed to create source image";
return DrawResult::kSkip;
}
auto sdc = SkCanvasPriv::TopDeviceSurfaceDrawContext(canvas);
if (!sdc) {
*errorMsg = GM::kErrorMsg_DrawSkippedGpuOnly;
return DrawResult::kSkip;
}
SkIRect srcRect = SkIRect::MakeSize(src.dimensions());
if (subsetSrc) {
srcRect = SkIRect::MakeXYWH(2.f*srcRect.width() /8.f,
1.f*srcRect.height()/8.f,
5.f*srcRect.width() /8.f,
6.f*srcRect.height()/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)
.makeOffset(srcRect.topLeft()),
SkIRect::MakeXYWH(-1.f*srcW/8.f, -7.f*srcH/8.f, 16.f*srcW/8.f, 2.f*srcH/8.f)
.makeOffset(srcRect.topLeft()),
SkIRect::MakeXYWH(10.f*srcW/8.f, -3.f*srcH/8.f, 4.f*srcW/8.f, 16.f*srcH/8.f)
.makeOffset(srcRect.topLeft()),
SkIRect::MakeXYWH(-7.f*srcW/8.f, 14.f*srcH/8.f, 18.f*srcW/8.f, 1.f*srcH/8.f)
.makeOffset(srcRect.topLeft()),
},
// 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)
.makeOffset(srcRect.topLeft()),
SkIRect::MakeXYWH(-5.f*srcW/8.f, 12.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
.makeOffset(srcRect.topLeft()),
SkIRect::MakeXYWH(12.f*srcW/8.f, -5.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
.makeOffset(srcRect.topLeft()),
SkIRect::MakeXYWH(12.f*srcW/8.f, 12.f*srcH/8.f, 2.f*srcW/8.f, 2.f*srcH/8.f)
.makeOffset(srcRect.topLeft()),
},
};
const auto& caps = *rContext->priv().caps();
static constexpr SkScalar kPad = 10;
SkVector trans = {kPad, kPad};
sdc->clear(SK_PMColor4fWHITE);
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;
paint.setColorFragmentProcessor(std::move(fp));
sdc->drawRect(nullptr, std::move(paint), GrAA::kNo, m, SkRect::Make(testArea));
}
// Do a blur for each dstRect in the set over our testArea-sized background.
for (const auto& dstRect : dstRectSet) {
const SkScalar sigmaX = src.width() / 10.f;
const SkScalar sigmaY = src.height() / 10.f;
auto blurFn = ref ? slow_blur : blur;
// Blur using the rect and draw on top.
if (auto blurView = blurFn(rContext,
src,
dstRect,
srcRect,
sigmaX,
sigmaY,
mode)) {
auto fp = GrTextureEffect::Make(blurView,
kPremul_SkAlphaType,
SkMatrix::I(),
sampler,
caps);
// Compose against white (default paint color)
fp = GrBlendFragmentProcessor::Make(std::move(fp),
/*dst=*/nullptr,
SkBlendMode::kSrcOver);
GrPaint paint;
// Compose against white (default paint color) and then replace the dst
// (SkBlendMode::kSrc).
fp = GrBlendFragmentProcessor::Make(std::move(fp),
/*dst=*/nullptr,
SkBlendMode::kSrcOver);
paint.setColorFragmentProcessor(std::move(fp));
paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
sdc->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;
stroke.setStyle(SkPaint::kStroke_Style);
stroke.setStrokeWidth(1.f);
GrStyle style(stroke);
auto dstR = SkRect::Make(dstRect).makeOutset(0.5f, 0.5f);
sdc->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;
stroke.setStyle(SkPaint::kStroke_Style);
stroke.setStrokeWidth(1.f);
GrStyle style(stroke);
auto srcR = SkRect::Make(srcRect).makeOutset(0.5f, 0.5f);
sdc->drawRect(nullptr, std::move(paint), GrAA::kNo, m, srcR, &style);
}
trans.fX += testArea.width() + kPad;
}
trans.fX = kPad;
trans.fY += testArea.height() + kPad;
}
return DrawResult::kOk;
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(gpu_blur_utils, rContext, canvas, errorMsg, 765, 955) {
return run(rContext, canvas, errorMsg, false, false);
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(gpu_blur_utils_ref, rContext, canvas, errorMsg, 765, 955) {
return run(rContext, canvas, errorMsg, false, true);
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(gpu_blur_utils_subset_rect, rContext, canvas, errorMsg, 485, 730) {
return run(rContext, canvas, errorMsg, true, false);
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(gpu_blur_utils_subset_ref, rContext, canvas, errorMsg, 485, 730) {
return run(rContext, canvas, errorMsg, true, true);
}
// Because of the way blur sigmas concat (sigTotal = sqrt(sig1^2 + sig2^2) generating these images
// for very large sigmas is incredibly slow. This can be enabled while working on the blur code to
// check results.
static bool constexpr kShowSlowRefImages = false;
static DrawResult do_very_large_blur_gm(GrRecordingContext* rContext,
SkCanvas* canvas,
SkString* errorMsg,
GrSurfaceProxyView src,
SkIRect srcB) {
auto sdc = SkCanvasPriv::TopDeviceSurfaceDrawContext(canvas);
if (!sdc) {
*errorMsg = GM::kErrorMsg_DrawSkippedGpuOnly;
return DrawResult::kSkip;
}
// Clear to a color other than gray to contrast with test image.
sdc->clear(SkColor4f{0.3f, 0.4f, 0.2f, 1});
int x = 10;
int y = 10;
for (auto blurDirs : {0b01, 0b10, 0b11}) {
for (int t = 0; t <= static_cast<int>(SkTileMode::kLastTileMode); ++t) {
auto tm = static_cast<SkTileMode>(t);
auto dstB = srcB.makeOutset(30, 30);
for (float sigma : {0.f, 5.f, 25.f, 80.f}) {
std::vector<decltype(blur)*> blurs;
blurs.push_back(blur);
if (kShowSlowRefImages) {
blurs.push_back(slow_blur);
}
for (auto b : blurs) {
float sigX = sigma*((blurDirs & 0b01) >> 0);
float sigY = sigma*((blurDirs & 0b10) >> 1);
GrSurfaceProxyView result = b(rContext, src, dstB, srcB, sigX, sigY, tm);
auto dstRect = SkIRect::MakeSize(dstB.size()).makeOffset(x, y);
// Draw a rect to show where the result should be so it's obvious if it's
// missing.
GrPaint paint;
paint.setColor4f(b == blur ? SkPMColor4f{0, 0, 1, 1} : SkPMColor4f{1, 0, 0, 1});
sdc->drawRect(nullptr,
std::move(paint),
GrAA::kNo,
SkMatrix::I(),
SkRect::Make(dstRect).makeOutset(0.5, 0.5),
&GrStyle::SimpleHairline());
if (result) {
std::unique_ptr<GrFragmentProcessor> fp =
GrTextureEffect::Make(std::move(result), kPremul_SkAlphaType);
fp = GrBlendFragmentProcessor::Make(std::move(fp),
/*dst=*/nullptr,
SkBlendMode::kSrcOver);
sdc->fillRectToRectWithFP(SkIRect::MakeSize(dstB.size()),
dstRect,
std::move(fp));
}
x += dstB.width() + 10;
}
}
x = 10;
y += dstB.height() + 10;
}
}
return DrawResult::kOk;
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(very_large_sigma_gpu_blur, rContext, canvas, errorMsg, 350, 1030) {
auto src = make_src_image(rContext, {15, 15});
auto srcB = SkIRect::MakeSize(src.dimensions());
return do_very_large_blur_gm(rContext, canvas, errorMsg, std::move(src), srcB);
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(very_large_sigma_gpu_blur_subset,
rContext,
canvas,
errorMsg,
350, 1030) {
auto srcB = SkIRect::MakeXYWH(2, 2, 15, 15);
SkISize imageSize = SkISize{srcB.width() + 4, srcB.height() + 4};
auto src = make_src_image(rContext, imageSize, &srcB);
return do_very_large_blur_gm(rContext, canvas, errorMsg, std::move(src), srcB);
}
DEF_SIMPLE_GPU_GM_CAN_FAIL(very_large_sigma_gpu_blur_subset_transparent_border,
rContext,
canvas,
errorMsg,
355, 1055) {
auto srcB = SkIRect::MakeXYWH(3, 3, 15, 15);
SkISize imageSize = SkISize{srcB.width() + 4, srcB.height() + 4};
auto src = make_src_image(rContext, imageSize, &srcB);
return do_very_large_blur_gm(rContext, canvas, errorMsg, std::move(src), srcB.makeOutset(1, 1));
}
} // namespace skiagm