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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrSWMaskHelper.h"
#include "GrCaps.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrRenderTargetContext.h"
#include "GrShape.h"
#include "GrSurfaceContext.h"
#include "GrTextureProxy.h"
#include "SkDistanceFieldGen.h"
#include "ops/GrDrawOp.h"
#include "ops/GrRectOpFactory.h"
/*
* Convert a boolean operation into a transfer mode code
*/
static SkBlendMode op_to_mode(SkRegion::Op op) {
static const SkBlendMode modeMap[] = {
SkBlendMode::kDstOut, // kDifference_Op
SkBlendMode::kModulate, // kIntersect_Op
SkBlendMode::kSrcOver, // kUnion_Op
SkBlendMode::kXor, // kXOR_Op
SkBlendMode::kClear, // kReverseDifference_Op
SkBlendMode::kSrc, // kReplace_Op
};
return modeMap[op];
}
/**
* Draw a single rect element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::drawRect(const SkRect& rect, SkRegion::Op op, GrAA aa, uint8_t alpha) {
SkPaint paint;
paint.setBlendMode(op_to_mode(op));
paint.setAntiAlias(GrAA::kYes == aa);
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawRect(rect, paint);
}
/**
* Draw a single path element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::drawShape(const GrShape& shape, SkRegion::Op op, GrAA aa, uint8_t alpha) {
SkPaint paint;
paint.setPathEffect(shape.style().refPathEffect());
shape.style().strokeRec().applyToPaint(&paint);
paint.setAntiAlias(GrAA::kYes == aa);
SkPath path;
shape.asPath(&path);
if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
SkASSERT(0xFF == paint.getAlpha());
fDraw.drawPathCoverage(path, paint);
} else {
paint.setBlendMode(op_to_mode(op));
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawPath(path, paint);
}
}
bool GrSWMaskHelper::init(const SkIRect& resultBounds, const SkMatrix* matrix) {
if (matrix) {
fMatrix = *matrix;
} else {
fMatrix.setIdentity();
}
// Now translate so the bound's UL corner is at the origin
fMatrix.postTranslate(-SkIntToScalar(resultBounds.fLeft), -SkIntToScalar(resultBounds.fTop));
SkIRect bounds = SkIRect::MakeWH(resultBounds.width(), resultBounds.height());
const SkImageInfo bmImageInfo = SkImageInfo::MakeA8(bounds.width(), bounds.height());
if (!fPixels.tryAlloc(bmImageInfo)) {
return false;
}
fPixels.erase(0);
sk_bzero(&fDraw, sizeof(fDraw));
fDraw.fDst = fPixels;
fRasterClip.setRect(bounds);
fDraw.fRC = &fRasterClip;
fDraw.fMatrix = &fMatrix;
return true;
}
sk_sp<GrTextureProxy> GrSWMaskHelper::toTextureProxy(GrContext* context, SkBackingFit fit) {
GrSurfaceDesc desc;
desc.fOrigin = kTopLeft_GrSurfaceOrigin;
desc.fWidth = fPixels.width();
desc.fHeight = fPixels.height();
desc.fConfig = kAlpha_8_GrPixelConfig;
sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeDeferredSurfaceContext(
desc,
fit,
SkBudgeted::kYes);
if (!sContext || !sContext->asTextureProxy()) {
return nullptr;
}
SkImageInfo ii = SkImageInfo::MakeA8(desc.fWidth, desc.fHeight);
if (!sContext->writePixels(ii, fPixels.addr(), fPixels.rowBytes(), 0, 0)) {
return nullptr;
}
return sContext->asTextureProxyRef();
}
/**
* Convert mask generation results to a signed distance field
*/
void GrSWMaskHelper::toSDF(unsigned char* sdf) {
SkGenerateDistanceFieldFromA8Image(sdf, (const unsigned char*)fPixels.addr(),
fPixels.width(), fPixels.height(), fPixels.rowBytes());
}
////////////////////////////////////////////////////////////////////////////////
/**
* Software rasterizes shape to A8 mask and uploads the result to a scratch texture. Returns the
* resulting texture on success; nullptr on failure.
*/
sk_sp<GrTextureProxy> GrSWMaskHelper::DrawShapeMaskToTexture(GrContext* context,
const GrShape& shape,
const SkIRect& resultBounds,
GrAA aa,
SkBackingFit fit,
const SkMatrix* matrix) {
GrSWMaskHelper helper;
if (!helper.init(resultBounds, matrix)) {
return nullptr;
}
helper.drawShape(shape, SkRegion::kReplace_Op, aa, 0xFF);
return helper.toTextureProxy(context, fit);
}
void GrSWMaskHelper::DrawToTargetWithShapeMask(sk_sp<GrTextureProxy> proxy,
GrRenderTargetContext* renderTargetContext,
GrPaint&& paint,
const GrUserStencilSettings& userStencilSettings,
const GrClip& clip,
const SkMatrix& viewMatrix,
const SkIPoint& textureOriginInDeviceSpace,
const SkIRect& deviceSpaceRectToDraw) {
SkMatrix invert;
if (!viewMatrix.invert(&invert)) {
return;
}
SkRect dstRect = SkRect::Make(deviceSpaceRectToDraw);
// We use device coords to compute the texture coordinates. We take the device coords and apply
// a translation so that the top-left of the device bounds maps to 0,0, and then a scaling
// matrix to normalized coords.
SkMatrix maskMatrix = SkMatrix::MakeTrans(SkIntToScalar(-textureOriginInDeviceSpace.fX),
SkIntToScalar(-textureOriginInDeviceSpace.fY));
maskMatrix.preConcat(viewMatrix);
paint.addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(
std::move(proxy), nullptr, maskMatrix,
GrSamplerParams::kNone_FilterMode));
renderTargetContext->addDrawOp(clip,
GrRectOpFactory::MakeNonAAFillWithLocalMatrix(
std::move(paint), SkMatrix::I(), invert, dstRect,
GrAAType::kNone, &userStencilSettings));
}
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