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Unified Diff: src/effects/SkBlurMaskFilter.cpp

Issue 316273004: Faster GPU rect blur that doesn't require computing vertical and horizontal (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: missed a GM to ignore Created 6 years, 6 months ago
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Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index e808885dddbe8a3143db1a7973dce6b11dd6aa28..a1cee8eddf94b5b1c67e036ec7ea891cf1595273 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -557,40 +557,38 @@ public:
*/
static GrEffectRef* Create(GrContext *context, const SkRect& rect,
float sigma) {
- GrTexture *horizontalScanline = NULL, *verticalScanline = NULL;
- bool createdScanlines = CreateScanlineTextures(context, sigma,
- SkScalarCeilToInt(rect.width()),
- SkScalarCeilToInt(rect.height()),
- &horizontalScanline, &verticalScanline);
- SkAutoTUnref<GrTexture> hunref(horizontalScanline), vunref(verticalScanline);
- if (!createdScanlines) {
+ GrTexture *blurProfileTexture = NULL;
+ int doubleProfileSize = SkScalarCeilToInt(12*sigma);
+
+ if (doubleProfileSize <= rect.width() || doubleProfileSize <= rect.height()) {
+ // if the blur sigma is too large so the gaussian overlaps the whole
+ // rect in either direction, fall back to CPU path for now.
+
return NULL;
}
- AutoEffectUnref effect(SkNEW_ARGS(GrRectBlurEffect, (rect, sigma,
- horizontalScanline, verticalScanline)));
+
+ bool createdBlurProfileTexture = CreateBlurProfileTexture(context, sigma, &blurProfileTexture);
+ SkAutoTUnref<GrTexture> hunref(blurProfileTexture);
+ if (!createdBlurProfileTexture) {
+ return NULL;
+ }
+ AutoEffectUnref effect(SkNEW_ARGS(GrRectBlurEffect, (rect, sigma, blurProfileTexture)));
return CreateEffectRef(effect);
}
- unsigned int getWidth() const { return fWidth; }
- unsigned int getHeight() const { return fHeight; }
+ const SkRect& getRect() const { return fRect; }
float getSigma() const { return fSigma; }
- const GrCoordTransform& getTransform() const { return fTransform; }
private:
- GrRectBlurEffect(const SkRect& rect, float sigma,
- GrTexture *horizontal_scanline, GrTexture *vertical_scanline);
+ GrRectBlurEffect(const SkRect& rect, float sigma, GrTexture *blur_profile);
virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
- static bool CreateScanlineTextures(GrContext *context, float sigma,
- unsigned int width, unsigned int height,
- GrTexture **horizontalScanline,
- GrTexture **verticalScanline);
+ static bool CreateBlurProfileTexture(GrContext *context, float sigma,
+ GrTexture **blurProfileTexture);
- unsigned int fWidth, fHeight;
- float fSigma;
- GrTextureAccess fHorizontalScanlineAccess;
- GrTextureAccess fVerticalScanlineAccess;
- GrCoordTransform fTransform;
+ SkRect fRect;
+ float fSigma;
+ GrTextureAccess fBlurProfileAccess;
GR_DECLARE_EFFECT_TEST;
@@ -614,16 +612,31 @@ public:
private:
typedef GrGLUniformManager::UniformHandle UniformHandle;
- UniformHandle fWidthUni;
- UniformHandle fHeightUni;
+ UniformHandle fProxyRectUniform;
+ UniformHandle fProfileSizeUniform;
typedef GrGLEffect INHERITED;
};
+
+
GrGLRectBlurEffect::GrGLRectBlurEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
: INHERITED(factory) {
}
+void OutputRectBlurProfileLookup(GrGLShaderBuilder* builder,
+ const GrGLShaderBuilder::TextureSampler& sampler,
+ const char *output,
+ const char *profileSize, const char *loc,
+ const char *blurred_width,
+ const char *sharp_width) {
+ builder->fsCodeAppendf("\t\tfloat coord = (0.5 * (abs(2*%s - %s) - %s))/%s;\n",
+ loc, blurred_width, sharp_width, profileSize);
+ builder->fsCodeAppendf("\t\t%s = ", output);
+ builder->fsAppendTextureLookup(sampler, "vec2(coord,0.5)");
+ builder->fsCodeAppend(";\n");
+}
+
void GrGLRectBlurEffect::emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect&,
EffectKey key,
@@ -632,7 +645,19 @@ void GrGLRectBlurEffect::emitCode(GrGLShaderBuilder* builder,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) {
- SkString texture_coords = builder->ensureFSCoords2D(coords, 0);
+ const char *rectName;
+ const char *profileSizeName;
+
+ fProxyRectUniform = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
+ kVec4f_GrSLType,
+ "proxyRect",
+ &rectName);
+ fProfileSizeUniform = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
+ kFloat_GrSLType,
+ "profileSize",
+ &profileSizeName);
+
+ const char *fragmentPos = builder->fragmentPosition();
if (inputColor) {
builder->fsCodeAppendf("\tvec4 src=%s;\n", inputColor);
@@ -640,31 +665,46 @@ void GrGLRectBlurEffect::emitCode(GrGLShaderBuilder* builder,
builder->fsCodeAppendf("\tvec4 src=vec4(1)\n;");
}
- builder->fsCodeAppendf("\tvec4 horiz = ");
- builder->fsAppendTextureLookup( samplers[0], texture_coords.c_str() );
- builder->fsCodeAppendf(";\n");
- builder->fsCodeAppendf("\tvec4 vert = ");
- builder->fsAppendTextureLookup( samplers[1], texture_coords.c_str() );
- builder->fsCodeAppendf(";\n");
+ builder->fsCodeAppendf("\tvec2 translatedPos = %s.xy - %s.xy;\n", fragmentPos, rectName );
+ builder->fsCodeAppendf("\tfloat width = %s.z - %s.x;\n", rectName, rectName);
+ builder->fsCodeAppendf("\tfloat height = %s.w - %s.y;\n", rectName, rectName);
+
+ builder->fsCodeAppendf("\tvec2 smallDims = vec2(width - %s, height-%s);\n", profileSizeName, profileSizeName);
+ builder->fsCodeAppendf("\tfloat center = 2.0 * floor(%s/2 + .25) - 1;\n", profileSizeName);
+ builder->fsCodeAppendf("\tvec2 wh = smallDims - vec2(center,center);\n");
+
+ builder->fsCodeAppendf("\tfloat horiz_lookup;\n");
+ builder->fsCodeAppendf("\tif (%s <= smallDims.x) {\n", profileSizeName);
+ OutputRectBlurProfileLookup(builder, samplers[0], "horiz_lookup", profileSizeName, "translatedPos.x", "width", "wh.x");
+ builder->fsCodeAppendf("\t}\n");
- builder->fsCodeAppendf("\tfloat final = (horiz*vert).r;\n");
- builder->fsCodeAppendf("\t%s = final*src;\n", outputColor);
+ builder->fsCodeAppendf("\tfloat vert_lookup;\n");
+ builder->fsCodeAppendf("\tif (%s <= smallDims.y) {\n", profileSizeName);
+ OutputRectBlurProfileLookup(builder, samplers[0], "vert_lookup", profileSizeName, "translatedPos.y", "height", "wh.y");
+ builder->fsCodeAppendf("\t}\n");
+
+ builder->fsCodeAppendf("\tfloat final = 1.0 - horiz_lookup * vert_lookup;\n");
+
+ builder->fsCodeAppendf("\t%s = vec4(final, final, final, 1);\n", outputColor );
}
void GrGLRectBlurEffect::setData(const GrGLUniformManager& uman,
- const GrDrawEffect& drawEffect) {
+ const GrDrawEffect& drawEffect) {
+ const GrRectBlurEffect& rbe = drawEffect.castEffect<GrRectBlurEffect>();
+ SkRect rect = rbe.getRect();
+
+ uman.set4f(fProxyRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
+ uman.set1f(fProfileSizeUniform, SkScalarCeilToScalar(6*rbe.getSigma()));
}
-bool GrRectBlurEffect::CreateScanlineTextures(GrContext *context, float sigma,
- unsigned int width, unsigned int height,
- GrTexture **horizontalScanline,
- GrTexture **verticalScanline) {
+bool GrRectBlurEffect::CreateBlurProfileTexture(GrContext *context, float sigma,
+ GrTexture **blurProfileTexture) {
GrTextureParams params;
GrTextureDesc texDesc;
- unsigned int profile_size = SkScalarFloorToInt(6*sigma);
+ unsigned int profile_size = SkScalarCeilToInt(6*sigma);
- texDesc.fWidth = width;
+ texDesc.fWidth = profile_size;
texDesc.fHeight = 1;
texDesc.fConfig = kAlpha_8_GrPixelConfig;
@@ -672,73 +712,38 @@ bool GrRectBlurEffect::CreateScanlineTextures(GrContext *context, float sigma,
GrCacheID::Key key;
memset(&key, 0, sizeof(key));
key.fData32[0] = profile_size;
- key.fData32[1] = width;
- key.fData32[2] = 1;
- GrCacheID horizontalCacheID(gBlurProfileDomain, key);
+ key.fData32[1] = 1;
+ GrCacheID blurProfileKey(gBlurProfileDomain, key);
uint8_t *profile = NULL;
SkAutoTDeleteArray<uint8_t> ada(NULL);
- *horizontalScanline = context->findAndRefTexture(texDesc, horizontalCacheID, &params);
+ *blurProfileTexture = context->findAndRefTexture(texDesc, blurProfileKey, &params);
- if (NULL == *horizontalScanline) {
+ if (NULL == *blurProfileTexture) {
SkBlurMask::ComputeBlurProfile(sigma, &profile);
ada.reset(profile);
- SkAutoTMalloc<uint8_t> horizontalPixels(width);
- SkBlurMask::ComputeBlurredScanline(horizontalPixels, profile, width, sigma);
+ *blurProfileTexture = context->createTexture(&params, texDesc, blurProfileKey,
+ profile, 0);
- *horizontalScanline = context->createTexture(&params, texDesc, horizontalCacheID,
- horizontalPixels, 0);
-
- if (NULL == *horizontalScanline) {
+ if (NULL == *blurProfileTexture) {
return false;
}
}
- texDesc.fWidth = 1;
- texDesc.fHeight = height;
- key.fData32[1] = 1;
- key.fData32[2] = height;
- GrCacheID verticalCacheID(gBlurProfileDomain, key);
-
- *verticalScanline = context->findAndRefTexture(texDesc, verticalCacheID, &params);
- if (NULL == *verticalScanline) {
- if (NULL == profile) {
- SkBlurMask::ComputeBlurProfile(sigma, &profile);
- ada.reset(profile);
- }
-
- SkAutoTMalloc<uint8_t> verticalPixels(height);
- SkBlurMask::ComputeBlurredScanline(verticalPixels, profile, height, sigma);
-
- *verticalScanline = context->createTexture(&params, texDesc, verticalCacheID,
- verticalPixels, 0);
-
- if (NULL == *verticalScanline) {
- SkSafeSetNull(*horizontalScanline);
- return false;
- }
-
- }
return true;
}
GrRectBlurEffect::GrRectBlurEffect(const SkRect& rect, float sigma,
- GrTexture *horizontal_scanline, GrTexture *vertical_scanline)
+ GrTexture *blur_profile)
: INHERITED(),
- fWidth(horizontal_scanline->width()),
- fHeight(vertical_scanline->width()),
+ fRect(rect),
fSigma(sigma),
- fHorizontalScanlineAccess(horizontal_scanline),
- fVerticalScanlineAccess(vertical_scanline) {
- SkMatrix mat;
- mat.setRectToRect(rect, SkRect::MakeWH(1,1), SkMatrix::kFill_ScaleToFit);
- fTransform.reset(kLocal_GrCoordSet, mat);
- this->addTextureAccess(&fHorizontalScanlineAccess);
- this->addTextureAccess(&fVerticalScanlineAccess);
- this->addCoordTransform(&fTransform);
+ fBlurProfileAccess(blur_profile) {
+ this->addTextureAccess(&fBlurProfileAccess);
+ this->setWillReadFragmentPosition();
}
GrRectBlurEffect::~GrRectBlurEffect() {
@@ -750,10 +755,7 @@ const GrBackendEffectFactory& GrRectBlurEffect::getFactory() const {
bool GrRectBlurEffect::onIsEqual(const GrEffect& sBase) const {
const GrRectBlurEffect& s = CastEffect<GrRectBlurEffect>(sBase);
- return this->getWidth() == s.getWidth() &&
- this->getHeight() == s.getHeight() &&
- this->getSigma() == s.getSigma() &&
- this->getTransform() == s.getTransform();
+ return this->getSigma() == s.getSigma();
}
void GrRectBlurEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
@@ -793,7 +795,9 @@ bool SkBlurMaskFilterImpl::directFilterMaskGPU(GrContext* context,
SkMatrix ctm = context->getMatrix();
SkScalar xformedSigma = this->computeXformedSigma(ctm);
- rect.outset(3*xformedSigma, 3*xformedSigma);
+
+ float pad=SkScalarCeilToScalar(6*xformedSigma)/2.0f;
+ rect.outset(pad, pad);
SkAutoTUnref<GrEffectRef> effect(GrRectBlurEffect::Create(
context, rect, xformedSigma));
@@ -806,7 +810,6 @@ bool SkBlurMaskFilterImpl::directFilterMaskGPU(GrContext* context,
return false;
}
-
grp->addCoverageEffect(effect);
context->drawRect(*grp, rect);
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