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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrTextureAdjuster.h"
#include "GrContext.h"
#include "GrGpu.h"
#include "GrGpuResourcePriv.h"
#include "GrTexture.h"
#include "SkGrPriv.h"
GrTextureAdjuster::GrTextureAdjuster(GrTexture* original, SkAlphaType alphaType,
const SkIRect& contentArea, uint32_t uniqueID,
SkColorSpace* cs)
: INHERITED(contentArea.width(), contentArea.height(),
GrPixelConfigIsAlphaOnly(original->config()))
, fOriginal(original)
, fAlphaType(alphaType)
, fColorSpace(cs)
, fUniqueID(uniqueID) {
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);
}
}
void GrTextureAdjuster::makeCopyKey(const CopyParams& params, GrUniqueKey* copyKey,
SkColorSpace* dstColorSpace) {
// Destination color space is irrelevant - we already have a texture so we're just sub-setting
GrUniqueKey baseKey;
GrMakeKeyFromImageID(&baseKey, fUniqueID, SkIRect::MakeWH(this->width(), this->height()));
MakeCopyKeyFromOrigKey(baseKey, params, copyKey);
}
void GrTextureAdjuster::didCacheCopy(const GrUniqueKey& copyKey) {
// We don't currently have a mechanism for notifications on Images!
}
GrTexture* GrTextureAdjuster::refCopy(const CopyParams& copyParams) {
GrTexture* texture = this->originalTexture();
GrContext* context = texture->getContext();
const SkIRect* contentArea = this->contentAreaOrNull();
GrUniqueKey key;
this->makeCopyKey(copyParams, &key, nullptr);
if (key.isValid()) {
GrTexture* cachedCopy = context->textureProvider()->findAndRefTextureByUniqueKey(key);
if (cachedCopy) {
return cachedCopy;
}
}
GrTexture* copy = CopyOnGpu(texture, contentArea, copyParams);
if (copy) {
if (key.isValid()) {
copy->resourcePriv().setUniqueKey(key);
this->didCacheCopy(key);
}
}
return copy;
}
GrTexture* GrTextureAdjuster::refTextureSafeForParams(const GrSamplerParams& params,
SkIPoint* outOffset,
SkScalar scaleAdjust[2]) {
GrTexture* texture = this->originalTexture();
GrContext* context = texture->getContext();
CopyParams copyParams;
const SkIRect* contentArea = this->contentAreaOrNull();
if (!context) {
// The texture was abandoned.
return nullptr;
}
if (contentArea && GrSamplerParams::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 = GrSamplerParams::kBilerp_FilterMode;
} else if (!context->getGpu()->makeCopyForTextureParams(texture, params, ©Params,
scaleAdjust)) {
if (outOffset) {
if (contentArea) {
outOffset->set(contentArea->fLeft, contentArea->fRight);
} else {
outOffset->set(0, 0);
}
}
return SkRef(texture);
}
GrTexture* copy = this->refCopy(copyParams);
if (copy && outOffset) {
outOffset->set(0, 0);
}
return copy;
}
sk_sp<GrFragmentProcessor> GrTextureAdjuster::createFragmentProcessor(
const SkMatrix& origTextureMatrix,
const SkRect& origConstraintRect,
FilterConstraint filterConstraint,
bool coordsLimitedToConstraintRect,
const GrSamplerParams::FilterMode* filterOrNullForBicubic,
SkColorSpace* dstColorSpace) {
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;
GrSamplerParams params;
if (filterOrNullForBicubic) {
params.setFilterMode(*filterOrNullForBicubic);
}
SkScalar scaleAdjust[2] = { 1.0f, 1.0f };
sk_sp<GrTexture> texture(this->refTextureSafeForParams(params, nullptr, scaleAdjust));
if (!texture) {
return nullptr;
}
// If we made a copy then we only copied the contentArea, in which case the new texture is all
// content.
if (texture.get() != this->originalTexture()) {
contentArea = nullptr;
textureMatrix.postScale(scaleAdjust[0], scaleAdjust[1]);
}
DomainMode domainMode =
DetermineDomainMode(*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 &&
GrSamplerParams::kMipMap_FilterMode == *filterOrNullForBicubic);
static const GrSamplerParams::FilterMode kBilerp = GrSamplerParams::kBilerp_FilterMode;
domainMode =
DetermineDomainMode(*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));
sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(fColorSpace,
dstColorSpace);
return CreateFragmentProcessorForDomainAndFilter(texture.get(), std::move(colorSpaceXform),
textureMatrix, domainMode, domain,
filterOrNullForBicubic);
}
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