/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGpuDevice.h"
#include "GrBlurUtils.h"
#include "GrCaps.h"
#include "GrColorSpaceXform.h"
#include "GrRenderTargetContext.h"
#include "GrShape.h"
#include "GrStyle.h"
#include "GrTextureAdjuster.h"
#include "GrTextureMaker.h"
#include "SkDraw.h"
#include "SkGr.h"
#include "SkMaskFilterBase.h"
#include "effects/GrBicubicEffect.h"
#include "effects/GrSimpleTextureEffect.h"
#include "effects/GrTextureDomain.h"
static inline bool use_shader(bool textureIsAlphaOnly, const SkPaint& paint) {
return textureIsAlphaOnly && paint.getShader();
}
//////////////////////////////////////////////////////////////////////////////
// Helper functions for dropping src rect constraint in bilerp mode.
static const SkScalar kColorBleedTolerance = 0.001f;
static bool has_aligned_samples(const SkRect& srcRect, const SkRect& transformedRect) {
// detect pixel disalignment
if (SkScalarAbs(SkScalarRoundToScalar(transformedRect.left()) - transformedRect.left()) < kColorBleedTolerance &&
SkScalarAbs(SkScalarRoundToScalar(transformedRect.top()) - transformedRect.top()) < kColorBleedTolerance &&
SkScalarAbs(transformedRect.width() - srcRect.width()) < kColorBleedTolerance &&
SkScalarAbs(transformedRect.height() - srcRect.height()) < kColorBleedTolerance) {
return true;
}
return false;
}
static bool may_color_bleed(const SkRect& srcRect,
const SkRect& transformedRect,
const SkMatrix& m,
GrFSAAType fsaaType) {
// Only gets called if has_aligned_samples returned false.
// So we can assume that sampling is axis aligned but not texel aligned.
SkASSERT(!has_aligned_samples(srcRect, transformedRect));
SkRect innerSrcRect(srcRect), innerTransformedRect, outerTransformedRect(transformedRect);
if (GrFSAAType::kUnifiedMSAA == fsaaType) {
innerSrcRect.inset(SK_Scalar1, SK_Scalar1);
} else {
innerSrcRect.inset(SK_ScalarHalf, SK_ScalarHalf);
}
m.mapRect(&innerTransformedRect, innerSrcRect);
// The gap between outerTransformedRect and innerTransformedRect
// represents the projection of the source border area, which is
// problematic for color bleeding. We must check whether any
// destination pixels sample the border area.
outerTransformedRect.inset(kColorBleedTolerance, kColorBleedTolerance);
innerTransformedRect.outset(kColorBleedTolerance, kColorBleedTolerance);
SkIRect outer, inner;
outerTransformedRect.round(&outer);
innerTransformedRect.round(&inner);
// If the inner and outer rects round to the same result, it means the
// border does not overlap any pixel centers. Yay!
return inner != outer;
}
static bool can_ignore_bilerp_constraint(const GrTextureProducer& producer,
const SkRect& srcRect,
const SkMatrix& srcRectToDeviceSpace,
GrFSAAType fsaaType) {
if (srcRectToDeviceSpace.rectStaysRect()) {
// sampling is axis-aligned
SkRect transformedRect;
srcRectToDeviceSpace.mapRect(&transformedRect, srcRect);
if (has_aligned_samples(srcRect, transformedRect) ||
!may_color_bleed(srcRect, transformedRect, srcRectToDeviceSpace, fsaaType)) {
return true;
}
}
return false;
}
/**
* Checks whether the paint is compatible with using GrRenderTargetContext::drawTexture. It is more
* efficient than the GrTextureProducer general case.
*/
static bool can_use_draw_texture(const SkPaint& paint) {
return (!paint.getColorFilter() && !paint.getShader() && !paint.getMaskFilter() &&
!paint.getImageFilter() && paint.getFilterQuality() < kMedium_SkFilterQuality &&
paint.getBlendMode() == SkBlendMode::kSrcOver);
}
static void draw_texture(const SkPaint& paint, const SkMatrix& ctm, const SkRect* src,
const SkRect* dst, GrAA aa, SkCanvas::SrcRectConstraint constraint,
sk_sp<GrTextureProxy> proxy, SkAlphaType alphaType,
SkColorSpace* colorSpace, const GrClip& clip, GrRenderTargetContext* rtc) {
SkASSERT(!(SkToBool(src) && !SkToBool(dst)));
SkRect srcRect = src ? *src : SkRect::MakeWH(proxy->width(), proxy->height());
SkRect dstRect = dst ? *dst : srcRect;
if (src && !SkRect::MakeIWH(proxy->width(), proxy->height()).contains(srcRect)) {
// Shrink the src rect to be within bounds and proportionately shrink the dst rect.
SkMatrix srcToDst;
srcToDst.setRectToRect(srcRect, dstRect, SkMatrix::kFill_ScaleToFit);
SkAssertResult(srcRect.intersect(SkRect::MakeIWH(proxy->width(), proxy->height())));
srcToDst.mapRect(&dstRect, srcRect);
}
const GrColorSpaceInfo& dstInfo(rtc->colorSpaceInfo());
auto textureXform =
GrColorSpaceXform::Make(colorSpace , alphaType,
dstInfo.colorSpace(), kPremul_SkAlphaType);
GrSamplerState::Filter filter;
switch (paint.getFilterQuality()) {
case kNone_SkFilterQuality:
filter = GrSamplerState::Filter::kNearest;
break;
case kLow_SkFilterQuality:
filter = GrSamplerState::Filter::kBilerp;
break;
case kMedium_SkFilterQuality:
case kHigh_SkFilterQuality:
SK_ABORT("Quality level not allowed.");
}
SkPMColor4f color;
if (GrPixelConfigIsAlphaOnly(proxy->config())) {
color = SkColor4fPrepForDst(paint.getColor4f(), dstInfo, *rtc->caps()).premul();
} else {
float paintAlpha = paint.getColor4f().fA;
color = { paintAlpha, paintAlpha, paintAlpha, paintAlpha };
}
GrQuadAAFlags aaFlags = aa == GrAA::kYes ? GrQuadAAFlags::kAll : GrQuadAAFlags::kNone;
rtc->drawTexture(clip, std::move(proxy), filter, color, srcRect, dstRect, aaFlags, constraint,
ctm, std::move(textureXform));
}
//////////////////////////////////////////////////////////////////////////////
void SkGpuDevice::drawPinnedTextureProxy(sk_sp<GrTextureProxy> proxy, uint32_t pinnedUniqueID,
SkColorSpace* colorSpace, SkAlphaType alphaType,
const SkRect* srcRect, const SkRect* dstRect,
SkCanvas::SrcRectConstraint constraint,
const SkMatrix& viewMatrix, const SkPaint& paint) {
GrAA aa = GrAA(paint.isAntiAlias());
if (can_use_draw_texture(paint)) {
draw_texture(paint, viewMatrix, srcRect, dstRect, aa, constraint, std::move(proxy),
alphaType, colorSpace, this->clip(), fRenderTargetContext.get());
return;
}
GrTextureAdjuster adjuster(this->context(), std::move(proxy), alphaType, pinnedUniqueID,
colorSpace);
this->drawTextureProducer(&adjuster, srcRect, dstRect, constraint, viewMatrix, paint, false);
}
void SkGpuDevice::drawTextureProducer(GrTextureProducer* producer,
const SkRect* srcRect,
const SkRect* dstRect,
SkCanvas::SrcRectConstraint constraint,
const SkMatrix& viewMatrix,
const SkPaint& paint,
bool attemptDrawTexture) {
if (attemptDrawTexture && can_use_draw_texture(paint)) {
GrAA aa = GrAA(paint.isAntiAlias());
// We've done enough checks above to allow us to pass ClampNearest() and not check for
// scaling adjustments.
auto proxy = producer->refTextureProxyForParams(GrSamplerState::ClampNearest(), nullptr);
if (!proxy) {
return;
}
draw_texture(paint, viewMatrix, srcRect, dstRect, aa, constraint, std::move(proxy),
producer->alphaType(), producer->colorSpace(), this->clip(),
fRenderTargetContext.get());
return;
}
// This is the funnel for all non-tiled bitmap/image draw calls. Log a histogram entry.
SK_HISTOGRAM_BOOLEAN("DrawTiled", false);
// Figure out the actual dst and src rect by clipping the src rect to the bounds of the
// adjuster. If the src rect is clipped then the dst rect must be recomputed. Also determine
// the matrix that maps the src rect to the dst rect.
SkRect clippedSrcRect;
SkRect clippedDstRect;
const SkRect srcBounds = SkRect::MakeIWH(producer->width(), producer->height());
SkMatrix srcToDstMatrix;
if (srcRect) {
if (!dstRect) {
dstRect = &srcBounds;
}
if (!srcBounds.contains(*srcRect)) {
clippedSrcRect = *srcRect;
if (!clippedSrcRect.intersect(srcBounds)) {
return;
}
if (!srcToDstMatrix.setRectToRect(*srcRect, *dstRect, SkMatrix::kFill_ScaleToFit)) {
return;
}
srcToDstMatrix.mapRect(&clippedDstRect, clippedSrcRect);
} else {
clippedSrcRect = *srcRect;
clippedDstRect = *dstRect;
if (!srcToDstMatrix.setRectToRect(*srcRect, *dstRect, SkMatrix::kFill_ScaleToFit)) {
return;
}
}
} else {
clippedSrcRect = srcBounds;
if (dstRect) {
clippedDstRect = *dstRect;
if (!srcToDstMatrix.setRectToRect(srcBounds, *dstRect, SkMatrix::kFill_ScaleToFit)) {
return;
}
} else {
clippedDstRect = srcBounds;
srcToDstMatrix.reset();
}
}
// Now that we have both the view and srcToDst matrices, log our scale factor.
LogDrawScaleFactor(SkMatrix::Concat(viewMatrix, srcToDstMatrix), paint.getFilterQuality());
this->drawTextureProducerImpl(producer, clippedSrcRect, clippedDstRect, constraint, viewMatrix,
srcToDstMatrix, paint);
}
void SkGpuDevice::drawTextureProducerImpl(GrTextureProducer* producer,
const SkRect& clippedSrcRect,
const SkRect& clippedDstRect,
SkCanvas::SrcRectConstraint constraint,
const SkMatrix& viewMatrix,
const SkMatrix& srcToDstMatrix,
const SkPaint& paint) {
// Specifying the texture coords as local coordinates is an attempt to enable more GrDrawOp
// combining by not baking anything about the srcRect, dstRect, or viewMatrix, into the texture
// FP. In the future this should be an opaque optimization enabled by the combination of
// GrDrawOp/GP and FP.
const SkMaskFilter* mf = paint.getMaskFilter();
if (mf && as_MFB(mf)->hasFragmentProcessor()) {
mf = nullptr;
}
// The shader expects proper local coords, so we can't replace local coords with texture coords
// if the shader will be used. If we have a mask filter we will change the underlying geometry
// that is rendered.
bool canUseTextureCoordsAsLocalCoords = !use_shader(producer->isAlphaOnly(), paint) && !mf;
bool doBicubic;
GrSamplerState::Filter fm = GrSkFilterQualityToGrFilterMode(
paint.getFilterQuality(), viewMatrix, srcToDstMatrix,
fContext->contextPriv().sharpenMipmappedTextures(), &doBicubic);
const GrSamplerState::Filter* filterMode = doBicubic ? nullptr : &fm;
GrTextureProducer::FilterConstraint constraintMode;
if (SkCanvas::kFast_SrcRectConstraint == constraint) {
constraintMode = GrTextureAdjuster::kNo_FilterConstraint;
} else {
constraintMode = GrTextureAdjuster::kYes_FilterConstraint;
}
// If we have to outset for AA then we will generate texture coords outside the src rect. The
// same happens for any mask filter that extends the bounds rendered in the dst.
// This is conservative as a mask filter does not have to expand the bounds rendered.
bool coordsAllInsideSrcRect = !paint.isAntiAlias() && !mf;
// Check for optimization to drop the src rect constraint when on bilerp.
if (filterMode && GrSamplerState::Filter::kBilerp == *filterMode &&
GrTextureAdjuster::kYes_FilterConstraint == constraintMode && coordsAllInsideSrcRect) {
SkMatrix combinedMatrix;
combinedMatrix.setConcat(viewMatrix, srcToDstMatrix);
if (can_ignore_bilerp_constraint(*producer, clippedSrcRect, combinedMatrix,
fRenderTargetContext->fsaaType())) {
constraintMode = GrTextureAdjuster::kNo_FilterConstraint;
}
}
const SkMatrix* textureMatrix;
SkMatrix tempMatrix;
if (canUseTextureCoordsAsLocalCoords) {
textureMatrix = &SkMatrix::I();
} else {
if (!srcToDstMatrix.invert(&tempMatrix)) {
return;
}
textureMatrix = &tempMatrix;
}
auto fp = producer->createFragmentProcessor(*textureMatrix, clippedSrcRect, constraintMode,
coordsAllInsideSrcRect, filterMode);
SkColorSpace* rtColorSpace = fRenderTargetContext->colorSpaceInfo().colorSpace();
SkColorSpace* targetColorSpace = producer->targetColorSpace();
SkColorSpace* dstColorSpace = SkToBool(rtColorSpace) ? rtColorSpace : targetColorSpace;
fp = GrColorSpaceXformEffect::Make(std::move(fp), producer->colorSpace(), producer->alphaType(),
dstColorSpace);
if (!fp) {
return;
}
GrPaint grPaint;
if (!SkPaintToGrPaintWithTexture(fContext.get(), fRenderTargetContext->colorSpaceInfo(), paint,
viewMatrix, std::move(fp), producer->isAlphaOnly(),
&grPaint)) {
return;
}
GrAA aa = GrAA(paint.isAntiAlias());
if (canUseTextureCoordsAsLocalCoords) {
fRenderTargetContext->fillRectToRect(this->clip(), std::move(grPaint), aa, viewMatrix,
clippedDstRect, clippedSrcRect);
return;
}
if (!mf) {
fRenderTargetContext->drawRect(this->clip(), std::move(grPaint), aa, viewMatrix,
clippedDstRect);
return;
}
GrShape shape(clippedDstRect, GrStyle::SimpleFill());
GrBlurUtils::drawShapeWithMaskFilter(this->context(), fRenderTargetContext.get(), this->clip(),
shape, std::move(grPaint), viewMatrix, mf);
}