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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.
*/
// Some shared code used by both SkBigPicture and SkMiniPicture.
// SkTextHunter -- SkRecord visitor that returns true when the op draws text.
// SkBitmapHunter -- SkRecord visitor that returns true when the op draws a bitmap.
// SkPathCounter -- SkRecord visitor that counts paths that draw slowly on the GPU.
#include "SkPathEffect.h"
#include "SkRecords.h"
#include "SkTLogic.h"
struct SkTextHunter {
// Most ops never have text. Some always do. Subpictures know themeselves.
template <typename T> bool operator()(const T&) { return false; }
bool operator()(const SkRecords::DrawPosText&) { return true; }
bool operator()(const SkRecords::DrawPosTextH&) { return true; }
bool operator()(const SkRecords::DrawText&) { return true; }
bool operator()(const SkRecords::DrawTextBlob&) { return true; }
bool operator()(const SkRecords::DrawTextOnPath&) { return true; }
bool operator()(const SkRecords::DrawPicture& op) { return op.picture->hasText(); }
};
struct SkBitmapHunter {
// Helpers. These create HasMember_bitmap and HasMember_paint.
SK_CREATE_MEMBER_DETECTOR(bitmap);
SK_CREATE_MEMBER_DETECTOR(paint);
// Some ops have a paint, some have an optional paint. Either way, get back a pointer.
static const SkPaint* AsPtr(const SkPaint& p) { return &p; }
static const SkPaint* AsPtr(const SkRecords::Optional<SkPaint>& p) { return p; }
// Main entry for visitor:
// If the op is a DrawPicture, recurse.
// If the op has a bitmap directly, return true.
// If the op has a paint and the paint has a bitmap, return true.
// Otherwise, return false.
bool operator()(const SkRecords::DrawPicture& op) { return op.picture->willPlayBackBitmaps(); }
template <typename T>
bool operator()(const T& r) { return CheckBitmap(r); }
// If the op has a bitmap, of course we're going to play back bitmaps.
template <typename T>
static SK_WHEN(HasMember_bitmap<T>, bool) CheckBitmap(const T&) { return true; }
// If not, look for one in its paint (if it has a paint).
template <typename T>
static SK_WHEN(!HasMember_bitmap<T>, bool) CheckBitmap(const T& r) { return CheckPaint(r); }
// If we have a paint, dig down into the effects looking for a bitmap.
template <typename T>
static SK_WHEN(HasMember_paint<T>, bool) CheckPaint(const T& r) {
const SkPaint* paint = AsPtr(r.paint);
if (paint) {
const SkShader* shader = paint->getShader();
if (shader &&
shader->asABitmap(nullptr, nullptr, nullptr) == SkShader::kDefault_BitmapType) {
return true;
}
}
return false;
}
// If we don't have a paint, that non-paint has no bitmap.
template <typename T>
static SK_WHEN(!HasMember_paint<T>, bool) CheckPaint(const T&) { return false; }
};
// TODO: might be nicer to have operator() return an int (the number of slow paths) ?
struct SkPathCounter {
SK_CREATE_MEMBER_DETECTOR(paint);
// Some ops have a paint, some have an optional paint. Either way, get back a pointer.
static const SkPaint* AsPtr(const SkPaint& p) { return &p; }
static const SkPaint* AsPtr(const SkRecords::Optional<SkPaint>& p) { return p; }
SkPathCounter() : fNumSlowPathsAndDashEffects(0) {}
// Recurse into nested pictures.
void operator()(const SkRecords::DrawPicture& op) {
fNumSlowPathsAndDashEffects += op.picture->numSlowPaths();
}
void checkPaint(const SkPaint* paint) {
if (paint && paint->getPathEffect()) {
// Initially assume it's slow.
fNumSlowPathsAndDashEffects++;
}
}
void operator()(const SkRecords::DrawPoints& op) {
this->checkPaint(&op.paint);
const SkPathEffect* effect = op.paint.getPathEffect();
if (effect) {
SkPathEffect::DashInfo info;
SkPathEffect::DashType dashType = effect->asADash(&info);
if (2 == op.count && SkPaint::kRound_Cap != op.paint.getStrokeCap() &&
SkPathEffect::kDash_DashType == dashType && 2 == info.fCount) {
fNumSlowPathsAndDashEffects--;
}
}
}
void operator()(const SkRecords::DrawPath& op) {
this->checkPaint(&op.paint);
if (op.paint.isAntiAlias() && !op.path.isConvex()) {
SkPaint::Style paintStyle = op.paint.getStyle();
const SkRect& pathBounds = op.path.getBounds();
if (SkPaint::kStroke_Style == paintStyle &&
0 == op.paint.getStrokeWidth()) {
// AA hairline concave path is not slow.
} else if (SkPaint::kFill_Style == paintStyle && pathBounds.width() < 64.f &&
pathBounds.height() < 64.f && !op.path.isVolatile()) {
// AADF eligible concave path is not slow.
} else {
fNumSlowPathsAndDashEffects++;
}
}
}
template <typename T>
SK_WHEN(HasMember_paint<T>, void) operator()(const T& op) {
this->checkPaint(AsPtr(op.paint));
}
template <typename T>
SK_WHEN(!HasMember_paint<T>, void) operator()(const T& op) { /* do nothing */ }
int fNumSlowPathsAndDashEffects;
};
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