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Use SDF path miplevels based on the original path's size

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Should produce sharper results than arbitrary fixed sizes.
Adds a new test to pathfill GM.

Was: https://skia-review.googlesource.com/c/8328/

BUG=chromium:682918, skia:6238

Change-Id: Ia62ea5ce6b4a5ac2b8b51d06d57dc951d6c340b8
Reviewed-on: https://skia-review.googlesource.com/8384
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
This commit is contained in:
Jim Van Verth 2017-02-15 15:46:52 -05:00 committed by Skia Commit-Bot
parent fa64774820
commit f9e678d696
4 changed files with 126 additions and 46 deletions
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55
gm/pathfill.cpp
View File

@ -140,7 +140,7 @@ static SkScalar make_line(SkPath* path) {
return SkIntToScalar(40);
}
static SkScalar make_info(SkPath* path) {
static void make_info(SkPath* path) {
path->moveTo(24, 4);
path->cubicTo(12.94999980926514f,
4,
@ -179,8 +179,49 @@ static SkScalar make_info(SkPath* path) {
path->lineTo(26, 14);
path->lineTo(26, 18);
path->close();
}
return SkIntToScalar(44);
static void make_accessibility(SkPath* path) {
path->moveTo(12, 2);
path->cubicTo(13.10000038146973f,
2,
14,
2.900000095367432f,
14,
4);
path->cubicTo(14,
5.099999904632568f,
13.10000038146973f,
6,
12,
6);
path->cubicTo(10.89999961853027f,
6,
10,
5.099999904632568f,
10,
4);
path->cubicTo(10,
2.900000095367432f,
10.89999961853027f,
2,
12,
2);
path->close();
path->moveTo(21, 9);
path->lineTo(15, 9);
path->lineTo(15, 22);
path->lineTo(13, 22);
path->lineTo(13, 16);
path->lineTo(11, 16);
path->lineTo(11, 22);
path->lineTo(9, 22);
path->lineTo(9, 9);
path->lineTo(3, 9);
path->lineTo(3, 7);
path->lineTo(21, 7);
path->lineTo(21, 9);
path->close();
}
constexpr MakePathProc gProcs[] = {
@ -202,13 +243,15 @@ class PathFillGM : public skiagm::GM {
SkPath fPath[N];
SkScalar fDY[N];
SkPath fInfoPath;
SkPath fAccessibilityPath;
protected:
void onOnceBeforeDraw() override {
for (size_t i = 0; i < N; i++) {
fDY[i] = gProcs[i](&fPath[i]);
}
(void) make_info(&fInfoPath);
make_info(&fInfoPath);
make_accessibility(&fAccessibilityPath);
}
@ -229,9 +272,15 @@ protected:
canvas->translate(SkIntToScalar(0), fDY[i]);
}
canvas->save();
canvas->scale(0.300000011920929f, 0.300000011920929f);
canvas->translate(50, 50);
canvas->drawPath(fInfoPath, paint);
canvas->restore();
canvas->scale(2, 2);
canvas->translate(5, 15);
canvas->drawPath(fAccessibilityPath, paint);
}
private:

24
src/core/SkMathPriv.h
View File

@ -131,6 +131,16 @@ static inline int SkNextPow2(int value) {
return 1 << (32 - SkCLZ(value - 1));
}
/**
* Returns the largest power-of-2 that is <= the specified value. If value
* is already a power of 2, then it is returned unchanged. It is undefined
* if value is <= 0.
*/
static inline int SkPrevPow2(int value) {
SkASSERT(value > 0);
return 1 << (32 - SkCLZ(value >> 1));
}
/**
* Returns the log2 of the specified value, were that value to be rounded up
* to the next power of 2. It is undefined to pass 0. Examples:
@ -145,6 +155,20 @@ static inline int SkNextLog2(uint32_t value) {
return 32 - SkCLZ(value - 1);
}
/**
* Returns the log2 of the specified value, were that value to be rounded down
* to the previous power of 2. It is undefined to pass 0. Examples:
* SkPrevLog2(1) -> 0
* SkPrevLog2(2) -> 1
* SkPrevLog2(3) -> 1
* SkPrevLog2(4) -> 2
* SkPrevLog2(5) -> 2
*/
static inline int SkPrevLog2(uint32_t value) {
SkASSERT(value != 0);
return 32 - SkCLZ(value >> 1);
}
///////////////////////////////////////////////////////////////////////////////
/**

53
src/gpu/ops/GrAADistanceFieldPathRenderer.cpp
View File

@ -10,6 +10,7 @@
#include "GrBuffer.h"
#include "GrContext.h"
#include "GrDistanceFieldGenFromVector.h"
#include "GrDrawOpTest.h"
#include "GrOpFlushState.h"
#include "GrPipelineBuilder.h"
@ -20,10 +21,9 @@
#include "effects/GrDistanceFieldGeoProc.h"
#include "ops/GrMeshDrawOp.h"
#include "SkPathOps.h"
#include "SkAutoMalloc.h"
#include "SkDistanceFieldGen.h"
#include "GrDistanceFieldGenFromVector.h"
#include "SkPathOps.h"
#define ATLAS_TEXTURE_WIDTH 2048
#define ATLAS_TEXTURE_HEIGHT 2048
@ -39,9 +39,11 @@ static int g_NumFreedShapes = 0;
#endif
// mip levels
static const int kSmallMIP = 32;
static const int kMediumMIP = 73;
static const int kLargeMIP = 162;
static const SkScalar kMaxMIP = 162;
static const SkScalar kMaxDim = 73;
static const SkScalar kMinSize = 8;
static const SkScalar kMaxSize = 2*kMaxMIP;
// Callback to clear out internal path cache when eviction occurs
void GrAADistanceFieldPathRenderer::HandleEviction(GrDrawOpAtlas::AtlasID id, void* pr) {
@ -107,14 +109,20 @@ bool GrAADistanceFieldPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) c
return false;
}
// Only support paths with bounds within kMediumMIP by kMediumMIP,
// scaled to have bounds within 2.0f*kLargeMIP by 2.0f*kLargeMIP.
// Only support paths with bounds within kMaxDim by kMaxDim,
// scaled to have bounds within kMaxSize by kMaxSize.
// The goal is to accelerate rendering of lots of small paths that may be scaling.
SkScalar maxScale = args.fViewMatrix->getMaxScale();
SkScalar scaleFactors[2];
if (!args.fViewMatrix->getMinMaxScales(scaleFactors)) {
return false;
}
SkRect bounds = args.fShape->styledBounds();
SkScalar minDim = SkMinScalar(bounds.width(), bounds.height());
SkScalar maxDim = SkMaxScalar(bounds.width(), bounds.height());
SkScalar minSize = minDim * scaleFactors[0];
SkScalar maxSize = maxDim * scaleFactors[1];
return maxDim <= kMediumMIP && maxDim * maxScale <= 2.0f*kLargeMIP;
return maxDim <= kMaxDim && kMinSize <= minSize && maxSize <= kMaxSize;
}
////////////////////////////////////////////////////////////////////////////////
@ -240,23 +248,22 @@ private:
SkScalar maxScale = this->viewMatrix().getMaxScale();
const SkRect& bounds = args.fShape.bounds();
SkScalar maxDim = SkMaxScalar(bounds.width(), bounds.height());
SkScalar size = maxScale * maxDim;
SkScalar desiredDimension;
// For minimizing (or the common case of identity) transforms, we try to
// create the DF at the appropriately sized native src-space path resolution.
// We try to create the DF at a power of two scaled path resolution (1/2, 1, 2, 4, etc)
// In the majority of cases this will yield a crisper rendering.
if (size <= maxDim && maxDim < kSmallMIP) {
desiredDimension = maxDim;
} else if (size <= kSmallMIP) {
desiredDimension = kSmallMIP;
} else if (size <= maxDim) {
desiredDimension = maxDim;
} else if (size <= kMediumMIP) {
desiredDimension = kMediumMIP;
} else {
desiredDimension = kLargeMIP;
SkScalar mipScale = 1.0f;
// Our mipscale is the maxScale clamped to the next highest power of 2
if (maxScale < SK_ScalarHalf) {
SkScalar log = SkScalarFloorToScalar(SkScalarLog2(SkScalarInvert(maxScale)));
mipScale = SkScalarPow(2, -log);
} else if (maxScale > SK_Scalar1) {
SkScalar log = SkScalarCeilToScalar(SkScalarLog2(maxScale));
mipScale = SkScalarPow(2, log);
}
SkScalar mipSize = mipScale*maxDim;
SkASSERT(maxScale * maxDim <= mipSize);
SkScalar desiredDimension = SkTMin(mipSize, kMaxMIP);
// check to see if path is cached
ShapeData::Key key(args.fShape, SkScalarCeilToInt(desiredDimension));
ShapeData* shapeData = fShapeCache->find(key);