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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkDrawLooper.h"
#include "SkCanvas.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkRect.h"
#include "SkSmallAllocator.h"
bool SkDrawLooper::canComputeFastBounds(const SkPaint& paint) const {
SkCanvas canvas;
SkSmallAllocator<1, 32> allocator;
void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize());
SkDrawLooper::Context* context = this->createContext(&canvas, buffer);
for (;;) {
SkPaint p(paint);
if (context->next(&canvas, &p)) {
p.setLooper(NULL);
if (!p.canComputeFastBounds()) {
return false;
}
} else {
break;
}
}
return true;
}
void SkDrawLooper::computeFastBounds(const SkPaint& paint, const SkRect& s,
SkRect* dst) const {
// src and dst rects may alias and we need to keep the original src, so copy it.
const SkRect src = s;
SkCanvas canvas;
SkSmallAllocator<1, 32> allocator;
void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize());
*dst = src; // catch case where there are no loops
SkDrawLooper::Context* context = this->createContext(&canvas, buffer);
for (bool firstTime = true;; firstTime = false) {
SkPaint p(paint);
if (context->next(&canvas, &p)) {
SkRect r(src);
p.setLooper(NULL);
p.computeFastBounds(r, &r);
canvas.getTotalMatrix().mapRect(&r);
if (firstTime) {
*dst = r;
} else {
dst->join(r);
}
} else {
break;
}
}
}
bool SkDrawLooper::asABlurShadow(BlurShadowRec*) const {
return false;
}
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