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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 "GrContext.h"
#include "GrContextPriv.h"
#include "GrShape.h"
#include "GrSurfaceContext.h"
#include "GrTextureProxy.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();
}
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