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/*
* 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 "GrTextureParamsAdjuster.h"
#include "GrCaps.h"
#include "GrContext.h"
#include "GrDrawContext.h"
#include "GrGpu.h"
#include "GrGpuResourcePriv.h"
#include "GrResourceKey.h"
#include "GrTexture.h"
#include "GrTextureParams.h"
#include "GrTextureProvider.h"
#include "SkCanvas.h"
#include "SkGr.h"
#include "SkGrPriv.h"
#include "effects/GrBicubicEffect.h"
#include "effects/GrTextureDomain.h"
typedef GrTextureProducer::CopyParams CopyParams;
//////////////////////////////////////////////////////////////////////////////
static GrTexture* copy_on_gpu(GrTexture* inputTexture, const SkIRect* subset,
const CopyParams& copyParams) {
SkASSERT(!subset || !subset->isEmpty());
GrContext* context = inputTexture->getContext();
SkASSERT(context);
const GrCaps* caps = context->caps();
// Either it's a cache miss or the original wasn't cached to begin with.
GrSurfaceDesc rtDesc = inputTexture->desc();
rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
rtDesc.fWidth = copyParams.fWidth;
rtDesc.fHeight = copyParams.fHeight;
rtDesc.fConfig = GrMakePixelConfigUncompressed(rtDesc.fConfig);
// If the config isn't renderable try converting to either A8 or an 32 bit config. Otherwise,
// fail.
if (!caps->isConfigRenderable(rtDesc.fConfig, false)) {
if (GrPixelConfigIsAlphaOnly(rtDesc.fConfig)) {
if (caps->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
rtDesc.fConfig = kAlpha_8_GrPixelConfig;
} else if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
rtDesc.fConfig = kSkia8888_GrPixelConfig;
} else {
return nullptr;
}
} else if (kRGB_GrColorComponentFlags ==
(kRGB_GrColorComponentFlags & GrPixelConfigComponentMask(rtDesc.fConfig))) {
if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
rtDesc.fConfig = kSkia8888_GrPixelConfig;
} else {
return nullptr;
}
} else {
return nullptr;
}
}
SkAutoTUnref<GrTexture> copy(context->textureProvider()->createTexture(rtDesc, true));
if (!copy) {
return nullptr;
}
// TODO: If no scaling is being performed then use copySurface.
GrPaint paint;
// TODO: Initializing these values for no reason cause the compiler is complaining
SkScalar sx = 0.f;
SkScalar sy = 0.f;
if (subset) {
sx = 1.f / inputTexture->width();
sy = 1.f / inputTexture->height();
}
if (copyParams.fFilter != GrTextureParams::kNone_FilterMode && subset &&
(subset->width() != copyParams.fWidth || subset->height() != copyParams.fHeight)) {
SkRect domain;
domain.fLeft = (subset->fLeft + 0.5f) * sx;
domain.fTop = (subset->fTop + 0.5f)* sy;
domain.fRight = (subset->fRight - 0.5f) * sx;
domain.fBottom = (subset->fBottom - 0.5f) * sy;
// This would cause us to read values from outside the subset. Surely, the caller knows
// better!
SkASSERT(copyParams.fFilter != GrTextureParams::kMipMap_FilterMode);
paint.addColorFragmentProcessor(
GrTextureDomainEffect::Create(inputTexture, SkMatrix::I(), domain,
GrTextureDomain::kClamp_Mode,
copyParams.fFilter))->unref();
} else {
GrTextureParams params(SkShader::kClamp_TileMode, copyParams.fFilter);
paint.addColorTextureProcessor(inputTexture, SkMatrix::I(), params);
}
paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
SkRect localRect;
if (subset) {
localRect = SkRect::Make(*subset);
localRect.fLeft *= sx;
localRect.fTop *= sy;
localRect.fRight *= sx;
localRect.fBottom *= sy;
} else {
localRect = SkRect::MakeWH(1.f, 1.f);
}
SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(copy->asRenderTarget()));
if (!drawContext) {
return nullptr;
}
SkRect dstRect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
drawContext->fillRectToRect(GrClip::WideOpen(), paint, SkMatrix::I(), dstRect, localRect);
return copy.detach();
}
GrTextureAdjuster::GrTextureAdjuster(GrTexture* original,
const SkIRect& contentArea,
bool isAlphaOnly)
: INHERITED(contentArea.width(), contentArea.height(), isAlphaOnly)
, fOriginal(original) {
SkASSERT(SkIRect::MakeWH(original->width(), original->height()).contains(contentArea));
if (contentArea.fLeft > 0 || contentArea.fTop > 0 ||
contentArea.fRight < original->width() || contentArea.fBottom < original->height()) {
fContentArea.set(contentArea);
}
}
GrTexture* GrTextureAdjuster::refTextureSafeForParams(const GrTextureParams& params,
SkIPoint* outOffset) {
GrTexture* texture = this->originalTexture();
GrContext* context = texture->getContext();
CopyParams copyParams;
const SkIRect* contentArea = this->contentAreaOrNull();
if (contentArea && GrTextureParams::kMipMap_FilterMode == params.filterMode()) {
// If we generate a MIP chain for texture it will read pixel values from outside the content
// area.
copyParams.fWidth = contentArea->width();
copyParams.fHeight = contentArea->height();
copyParams.fFilter = GrTextureParams::kBilerp_FilterMode;
} else if (!context->getGpu()->makeCopyForTextureParams(texture->width(), texture->height(),
params, &copyParams)) {
if (outOffset) {
if (contentArea) {
outOffset->set(contentArea->fLeft, contentArea->fRight);
} else {
outOffset->set(0, 0);
}
}
return SkRef(texture);
}
GrUniqueKey key;
this->makeCopyKey(copyParams, &key);
if (key.isValid()) {
GrTexture* result = context->textureProvider()->findAndRefTextureByUniqueKey(key);
if (result) {
return result;
}
}
GrTexture* result = copy_on_gpu(texture, contentArea, copyParams);
if (result) {
if (key.isValid()) {
result->resourcePriv().setUniqueKey(key);
this->didCacheCopy(key);
}
if (outOffset) {
outOffset->set(0, 0);
}
}
return result;
}
enum DomainMode {
kNoDomain_DomainMode,
kDomain_DomainMode,
kTightCopy_DomainMode
};
/** Determines whether a texture domain is necessary and if so what domain to use. There are two
* rectangles to consider:
* - The first is the content area specified by the texture adjuster. We can *never* allow
* filtering to cause bleed of pixels outside this rectangle.
* - The second rectangle is the constraint rectangle, which is known to be contained by the
* content area. The filterConstraint specifies whether we are allowed to bleed across this
* rect.
*
* We want to avoid using a domain if possible. We consider the above rectangles, the filter type,
* and whether the coords generated by the draw would all fall within the constraint rect. If the
* latter is true we only need to consider whether the filter would extend beyond the rects.
*/
static DomainMode determine_domain_mode(
const SkRect& constraintRect,
GrTextureAdjuster::FilterConstraint filterConstraint,
bool coordsLimitedToConstraintRect,
int texW, int texH,
const SkIRect* textureContentArea,
const GrTextureParams::FilterMode* filterModeOrNullForBicubic,
SkRect* domainRect) {
SkASSERT(SkRect::MakeIWH(texW, texH).contains(constraintRect));
// We only expect a content area rect if there is some non-content area.
SkASSERT(!textureContentArea ||
(!textureContentArea->contains(SkIRect::MakeWH(texW, texH)) &&
SkRect::Make(*textureContentArea).contains(constraintRect)));
SkRect textureBounds = SkRect::MakeIWH(texW, texH);
// If the src rectangle contains the whole texture then no need for a domain.
if (constraintRect.contains(textureBounds)) {
return kNoDomain_DomainMode;
}
bool restrictFilterToRect = (filterConstraint == GrTextureProducer::kYes_FilterConstraint);
// If we can filter outside the constraint rect, and there is no non-content area of the
// texture, and we aren't going to generate sample coords outside the constraint rect then we
// don't need a domain.
if (!restrictFilterToRect && !textureContentArea && coordsLimitedToConstraintRect) {
return kNoDomain_DomainMode;
}
// Get the domain inset based on sampling mode (or bail if mipped)
SkScalar filterHalfWidth = 0.f;
if (filterModeOrNullForBicubic) {
switch (*filterModeOrNullForBicubic) {
case GrTextureParams::kNone_FilterMode:
if (coordsLimitedToConstraintRect) {
return kNoDomain_DomainMode;
} else {
filterHalfWidth = 0.f;
}
break;
case GrTextureParams::kBilerp_FilterMode:
filterHalfWidth = .5f;
break;
case GrTextureParams::kMipMap_FilterMode:
if (restrictFilterToRect || textureContentArea) {
// No domain can save us here.
return kTightCopy_DomainMode;
}
return kNoDomain_DomainMode;
}
} else {
// bicubic does nearest filtering internally.
filterHalfWidth = 1.5f;
}
// Both bilerp and bicubic use bilinear filtering and so need to be clamped to the center
// of the edge texel. Pinning to the texel center has no impact on nearest mode and MIP-maps
static const SkScalar kDomainInset = 0.5f;
// Figure out the limits of pixels we're allowed to sample from.
// Unless we know the amount of outset and the texture matrix we have to conservatively enforce
// the domain.
if (restrictFilterToRect) {
domainRect->fLeft = constraintRect.fLeft + kDomainInset;
domainRect->fTop = constraintRect.fTop + kDomainInset;
domainRect->fRight = constraintRect.fRight - kDomainInset;
domainRect->fBottom = constraintRect.fBottom - kDomainInset;
} else if (textureContentArea) {
// If we got here then: there is a textureContentArea, the coords are limited to the
// constraint rect, and we're allowed to filter across the constraint rect boundary. So
// we check whether the filter would reach across the edge of the content area.
// We will only set the sides that are required.
domainRect->setLargest();
if (coordsLimitedToConstraintRect) {
// We may be able to use the fact that the texture coords are limited to the constraint
// rect in order to avoid having to add a domain.
bool needContentAreaConstraint = false;
if (textureContentArea->fLeft > 0 &&
textureContentArea->fLeft + filterHalfWidth > constraintRect.fLeft) {
domainRect->fLeft = textureContentArea->fLeft + kDomainInset;
needContentAreaConstraint = true;
}
if (textureContentArea->fTop > 0 &&
textureContentArea->fTop + filterHalfWidth > constraintRect.fTop) {
domainRect->fTop = textureContentArea->fTop + kDomainInset;
needContentAreaConstraint = true;
}
if (textureContentArea->fRight < texW &&
textureContentArea->fRight - filterHalfWidth < constraintRect.fRight) {
domainRect->fRight = textureContentArea->fRight - kDomainInset;
needContentAreaConstraint = true;
}
if (textureContentArea->fBottom < texH &&
textureContentArea->fBottom - filterHalfWidth < constraintRect.fBottom) {
domainRect->fBottom = textureContentArea->fBottom - kDomainInset;
needContentAreaConstraint = true;
}
if (!needContentAreaConstraint) {
return kNoDomain_DomainMode;
}
} else {
// Our sample coords for the texture are allowed to be outside the constraintRect so we
// don't consider it when computing the domain.
if (textureContentArea->fLeft != 0) {
domainRect->fLeft = textureContentArea->fLeft + kDomainInset;
}
if (textureContentArea->fTop != 0) {
domainRect->fTop = textureContentArea->fTop + kDomainInset;
}
if (textureContentArea->fRight != texW) {
domainRect->fRight = textureContentArea->fRight - kDomainInset;
}
if (textureContentArea->fBottom != texH) {
domainRect->fBottom = textureContentArea->fBottom - kDomainInset;
}
}
} else {
return kNoDomain_DomainMode;
}
if (domainRect->fLeft > domainRect->fRight) {
domainRect->fLeft = domainRect->fRight = SkScalarAve(domainRect->fLeft, domainRect->fRight);
}
if (domainRect->fTop > domainRect->fBottom) {
domainRect->fTop = domainRect->fBottom = SkScalarAve(domainRect->fTop, domainRect->fBottom);
}
domainRect->fLeft /= texW;
domainRect->fTop /= texH;
domainRect->fRight /= texW;
domainRect->fBottom /= texH;
return kDomain_DomainMode;
}
static const GrFragmentProcessor* create_fp_for_domain_and_filter(
GrTexture* texture,
const SkMatrix& textureMatrix,
DomainMode domainMode,
const SkRect& domain,
const GrTextureParams::FilterMode* filterOrNullForBicubic) {
SkASSERT(kTightCopy_DomainMode != domainMode);
if (filterOrNullForBicubic) {
if (kDomain_DomainMode == domainMode) {
return GrTextureDomainEffect::Create(texture, textureMatrix, domain,
GrTextureDomain::kClamp_Mode,
*filterOrNullForBicubic);
} else {
GrTextureParams params(SkShader::kClamp_TileMode, *filterOrNullForBicubic);
return GrSimpleTextureEffect::Create(texture, textureMatrix, params);
}
} else {
if (kDomain_DomainMode == domainMode) {
return GrBicubicEffect::Create(texture, textureMatrix, domain);
} else {
static const SkShader::TileMode kClampClamp[] =
{ SkShader::kClamp_TileMode, SkShader::kClamp_TileMode };
return GrBicubicEffect::Create(texture, textureMatrix, kClampClamp);
}
}
}
const GrFragmentProcessor* GrTextureAdjuster::createFragmentProcessor(
const SkMatrix& origTextureMatrix,
const SkRect& origConstraintRect,
FilterConstraint filterConstraint,
bool coordsLimitedToConstraintRect,
const GrTextureParams::FilterMode* filterOrNullForBicubic) {
SkMatrix textureMatrix = origTextureMatrix;
const SkIRect* contentArea = this->contentAreaOrNull();
// Convert the constraintRect to be relative to the texture rather than the content area so
// that both rects are in the same coordinate system.
SkTCopyOnFirstWrite<SkRect> constraintRect(origConstraintRect);
if (contentArea) {
SkScalar l = SkIntToScalar(contentArea->fLeft);
SkScalar t = SkIntToScalar(contentArea->fTop);
constraintRect.writable()->offset(l, t);
textureMatrix.postTranslate(l, t);
}
SkRect domain;
GrTexture* texture = this->originalTexture();
DomainMode domainMode =
determine_domain_mode(*constraintRect, filterConstraint, coordsLimitedToConstraintRect,
texture->width(), texture->height(),
contentArea, filterOrNullForBicubic,
&domain);
if (kTightCopy_DomainMode == domainMode) {
// TODO: Copy the texture and adjust the texture matrix (both parts need to consider
// non-int constraint rect)
// For now: treat as bilerp and ignore what goes on above level 0.
// We only expect MIP maps to require a tight copy.
SkASSERT(filterOrNullForBicubic &&
GrTextureParams::kMipMap_FilterMode == *filterOrNullForBicubic);
static const GrTextureParams::FilterMode kBilerp = GrTextureParams::kBilerp_FilterMode;
domainMode =
determine_domain_mode(*constraintRect, filterConstraint, coordsLimitedToConstraintRect,
texture->width(), texture->height(),
contentArea, &kBilerp, &domain);
SkASSERT(kTightCopy_DomainMode != domainMode);
}
SkASSERT(kNoDomain_DomainMode == domainMode ||
(domain.fLeft <= domain.fRight && domain.fTop <= domain.fBottom));
textureMatrix.postIDiv(texture->width(), texture->height());
return create_fp_for_domain_and_filter(texture, textureMatrix, domainMode, domain,
filterOrNullForBicubic);
}
//////////////////////////////////////////////////////////////////////////////
GrTexture* GrTextureMaker::refTextureForParams(const GrTextureParams& params) {
CopyParams copyParams;
if (!fContext->getGpu()->makeCopyForTextureParams(this->width(), this->height(), params,
&copyParams)) {
return this->refOriginalTexture();
}
GrUniqueKey copyKey;
this->makeCopyKey(copyParams, &copyKey);
if (copyKey.isValid()) {
GrTexture* result = fContext->textureProvider()->findAndRefTextureByUniqueKey(copyKey);
if (result) {
return result;
}
}
GrTexture* result = this->generateTextureForParams(copyParams);
if (!result) {
return nullptr;
}
if (copyKey.isValid()) {
fContext->textureProvider()->assignUniqueKeyToTexture(copyKey, result);
this->didCacheCopy(copyKey);
}
return result;
}
const GrFragmentProcessor* GrTextureMaker::createFragmentProcessor(
const SkMatrix& textureMatrix,
const SkRect& constraintRect,
FilterConstraint filterConstraint,
bool coordsLimitedToConstraintRect,
const GrTextureParams::FilterMode* filterOrNullForBicubic) {
const GrTextureParams::FilterMode* fmForDetermineDomain = filterOrNullForBicubic;
if (filterOrNullForBicubic && GrTextureParams::kMipMap_FilterMode == *filterOrNullForBicubic &&
kYes_FilterConstraint == filterConstraint) {
// TODo: Here we should force a copy restricted to the constraintRect since MIP maps will
// read outside the constraint rect. However, as in the adjuster case, we aren't currently
// doing that.
// We instead we compute the domain as though were bilerping which is only correct if we
// only sample level 0.
static const GrTextureParams::FilterMode kBilerp = GrTextureParams::kBilerp_FilterMode;
fmForDetermineDomain = &kBilerp;
}
GrTextureParams params;
if (filterOrNullForBicubic) {
params.reset(SkShader::kClamp_TileMode, *filterOrNullForBicubic);
} else {
// Bicubic doesn't use filtering for it's texture accesses.
params.reset(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
}
SkAutoTUnref<GrTexture> texture(this->refTextureForParams(params));
if (!texture) {
return nullptr;
}
SkRect domain;
DomainMode domainMode =
determine_domain_mode(constraintRect, filterConstraint, coordsLimitedToConstraintRect,
texture->width(), texture->height(), nullptr, fmForDetermineDomain,
&domain);
SkASSERT(kTightCopy_DomainMode != domainMode);
SkMatrix normalizedTextureMatrix = textureMatrix;
normalizedTextureMatrix.postIDiv(texture->width(), texture->height());
return create_fp_for_domain_and_filter(texture, normalizedTextureMatrix, domainMode, domain,
filterOrNullForBicubic);
}
GrTexture* GrTextureMaker::generateTextureForParams(const CopyParams& copyParams) {
SkAutoTUnref<GrTexture> original(this->refOriginalTexture());
if (!original) {
return nullptr;
}
return copy_on_gpu(original, nullptr, copyParams);
}