/*
* 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 "GrAARectRenderer.h"
#include "GrBatch.h"
#include "GrBatchTarget.h"
#include "GrBatchTest.h"
#include "GrContext.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrGeometryProcessor.h"
#include "GrInvariantOutput.h"
#include "GrResourceKey.h"
#include "GrResourceProvider.h"
#include "GrTestUtils.h"
#include "GrVertexBuffer.h"
#include "SkColorPriv.h"
#include "gl/GrGLProcessor.h"
#include "gl/GrGLGeometryProcessor.h"
#include "gl/builders/GrGLProgramBuilder.h"
///////////////////////////////////////////////////////////////////////////////
static void set_inset_fan(SkPoint* pts, size_t stride,
const SkRect& r, SkScalar dx, SkScalar dy) {
pts->setRectFan(r.fLeft + dx, r.fTop + dy,
r.fRight - dx, r.fBottom - dy, stride);
}
static const GrGeometryProcessor* create_fill_rect_gp(bool tweakAlphaForCoverage,
const SkMatrix& localMatrix) {
uint32_t flags = GrDefaultGeoProcFactory::kColor_GPType;
const GrGeometryProcessor* gp;
if (tweakAlphaForCoverage) {
gp = GrDefaultGeoProcFactory::Create(flags, GrColor_WHITE, SkMatrix::I(), localMatrix);
} else {
flags |= GrDefaultGeoProcFactory::kCoverage_GPType;
gp = GrDefaultGeoProcFactory::Create(flags, GrColor_WHITE, SkMatrix::I(), localMatrix);
}
return gp;
}
GR_DECLARE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey);
class AAFillRectBatch : public GrBatch {
public:
struct Geometry {
GrColor fColor;
SkMatrix fViewMatrix;
SkRect fRect;
SkRect fDevRect;
};
static GrBatch* Create(const Geometry& geometry) {
return SkNEW_ARGS(AAFillRectBatch, (geometry));
}
const char* name() const override { return "AAFillRectBatch"; }
void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
// When this is called on a batch, there is only one geometry bundle
out->setKnownFourComponents(fGeoData[0].fColor);
}
void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
out->setUnknownSingleComponent();
}
void initBatchTracker(const GrPipelineInfo& init) override {
// Handle any color overrides
if (init.fColorIgnored) {
fGeoData[0].fColor = GrColor_ILLEGAL;
} else if (GrColor_ILLEGAL != init.fOverrideColor) {
fGeoData[0].fColor = init.fOverrideColor;
}
// setup batch properties
fBatch.fColorIgnored = init.fColorIgnored;
fBatch.fColor = fGeoData[0].fColor;
fBatch.fUsesLocalCoords = init.fUsesLocalCoords;
fBatch.fCoverageIgnored = init.fCoverageIgnored;
fBatch.fCanTweakAlphaForCoverage = init.fCanTweakAlphaForCoverage;
}
void generateGeometry(GrBatchTarget* batchTarget, const GrPipeline* pipeline) override {
bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
SkMatrix localMatrix;
if (this->usesLocalCoords() && !this->viewMatrix().invert(&localMatrix)) {
SkDebugf("Cannot invert\n");
return;
}
SkAutoTUnref<const GrGeometryProcessor> gp(create_fill_rect_gp(canTweakAlphaForCoverage,
localMatrix));
batchTarget->initDraw(gp, pipeline);
// TODO this is hacky, but the only way we have to initialize the GP is to use the
// GrPipelineInfo struct so we can generate the correct shader. Once we have GrBatch
// everywhere we can remove this nastiness
GrPipelineInfo init;
init.fColorIgnored = fBatch.fColorIgnored;
init.fOverrideColor = GrColor_ILLEGAL;
init.fCoverageIgnored = fBatch.fCoverageIgnored;
init.fUsesLocalCoords = this->usesLocalCoords();
gp->initBatchTracker(batchTarget->currentBatchTracker(), init);
size_t vertexStride = gp->getVertexStride();
SkASSERT(canTweakAlphaForCoverage ?
vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) :
vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
int instanceCount = fGeoData.count();
SkAutoTUnref<const GrIndexBuffer> indexBuffer(this->getIndexBuffer(
batchTarget->resourceProvider()));
InstancedHelper helper;
void* vertices = helper.init(batchTarget, kTriangles_GrPrimitiveType, vertexStride,
indexBuffer, kVertsPerAAFillRect, kIndicesPerAAFillRect,
instanceCount);
if (!vertices || !indexBuffer) {
SkDebugf("Could not allocate vertices\n");
return;
}
for (int i = 0; i < instanceCount; i++) {
const Geometry& args = fGeoData[i];
this->generateAAFillRectGeometry(vertices,
i * kVertsPerAAFillRect * vertexStride,
vertexStride,
args.fColor,
args.fViewMatrix,
args.fRect,
args.fDevRect,
canTweakAlphaForCoverage);
}
helper.issueDraw(batchTarget);
}
SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
private:
AAFillRectBatch(const Geometry& geometry) {
this->initClassID<AAFillRectBatch>();
fGeoData.push_back(geometry);
this->setBounds(geometry.fDevRect);
}
static const int kNumAAFillRectsInIndexBuffer = 256;
static const int kVertsPerAAFillRect = 8;
static const int kIndicesPerAAFillRect = 30;
const GrIndexBuffer* getIndexBuffer(GrResourceProvider* resourceProvider) {
GR_DEFINE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey);
static const uint16_t gFillAARectIdx[] = {
0, 1, 5, 5, 4, 0,
1, 2, 6, 6, 5, 1,
2, 3, 7, 7, 6, 2,
3, 0, 4, 4, 7, 3,
4, 5, 6, 6, 7, 4,
};
GR_STATIC_ASSERT(SK_ARRAY_COUNT(gFillAARectIdx) == kIndicesPerAAFillRect);
return resourceProvider->refOrCreateInstancedIndexBuffer(gFillAARectIdx,
kIndicesPerAAFillRect, kNumAAFillRectsInIndexBuffer, kVertsPerAAFillRect,
gAAFillRectIndexBufferKey);
}
GrColor color() const { return fBatch.fColor; }
bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
bool canTweakAlphaForCoverage() const { return fBatch.fCanTweakAlphaForCoverage; }
bool colorIgnored() const { return fBatch.fColorIgnored; }
const SkMatrix& viewMatrix() const { return fGeoData[0].fViewMatrix; }
bool onCombineIfPossible(GrBatch* t) override {
AAFillRectBatch* that = t->cast<AAFillRectBatch>();
SkASSERT(this->usesLocalCoords() == that->usesLocalCoords());
// We apply the viewmatrix to the rect points on the cpu. However, if the pipeline uses
// local coords then we won't be able to batch. We could actually upload the viewmatrix
// using vertex attributes in these cases, but haven't investigated that
if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
return false;
}
if (this->color() != that->color()) {
fBatch.fColor = GrColor_ILLEGAL;
}
// In the event of two batches, one who can tweak, one who cannot, we just fall back to
// not tweaking
if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) {
fBatch.fCanTweakAlphaForCoverage = false;
}
fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
this->joinBounds(that->bounds());
return true;
}
void generateAAFillRectGeometry(void* vertices,
size_t offset,
size_t vertexStride,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkRect& devRect,
bool tweakAlphaForCoverage) const {
intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;
SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1);
inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());
if (viewMatrix.rectStaysRect()) {
set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
set_inset_fan(fan1Pos, vertexStride, devRect, inset, inset);
} else {
// compute transformed (1, 0) and (0, 1) vectors
SkVector vec[2] = {
{ viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY] },
{ viewMatrix[SkMatrix::kMSkewX], viewMatrix[SkMatrix::kMScaleY] }
};
vec[0].normalize();
vec[0].scale(SK_ScalarHalf);
vec[1].normalize();
vec[1].scale(SK_ScalarHalf);
// create the rotated rect
fan0Pos->setRectFan(rect.fLeft, rect.fTop,
rect.fRight, rect.fBottom, vertexStride);
viewMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4);
// Now create the inset points and then outset the original
// rotated points
// TL
*((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
*((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
*((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
// BL
*((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
*((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
*((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
// BR
*((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
*((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
*((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
// TR
*((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
*((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
*((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
}
// Make verts point to vertex color and then set all the color and coverage vertex attrs
// values.
verts += sizeof(SkPoint);
for (int i = 0; i < 4; ++i) {
if (tweakAlphaForCoverage) {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
} else {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
*reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
}
}
int scale;
if (inset < SK_ScalarHalf) {
scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
SkASSERT(scale >= 0 && scale <= 255);
} else {
scale = 0xff;
}
verts += 4 * vertexStride;
float innerCoverage = GrNormalizeByteToFloat(scale);
GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
for (int i = 0; i < 4; ++i) {
if (tweakAlphaForCoverage) {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
} else {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
*reinterpret_cast<float*>(verts + i * vertexStride +
sizeof(GrColor)) = innerCoverage;
}
}
}
struct BatchTracker {
GrColor fColor;
bool fUsesLocalCoords;
bool fColorIgnored;
bool fCoverageIgnored;
bool fCanTweakAlphaForCoverage;
};
BatchTracker fBatch;
SkSTArray<1, Geometry, true> fGeoData;
};
namespace {
// Should the coverage be multiplied into the color attrib or use a separate attrib.
enum CoverageAttribType {
kUseColor_CoverageAttribType,
kUseCoverage_CoverageAttribType,
};
}
void GrAARectRenderer::geometryFillAARect(GrDrawTarget* target,
GrPipelineBuilder* pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkRect& devRect) {
AAFillRectBatch::Geometry geometry;
geometry.fRect = rect;
geometry.fViewMatrix = viewMatrix;
geometry.fDevRect = devRect;
geometry.fColor = color;
SkAutoTUnref<GrBatch> batch(AAFillRectBatch::Create(geometry));
target->drawBatch(pipelineBuilder, batch);
}
void GrAARectRenderer::strokeAARect(GrDrawTarget* target,
GrPipelineBuilder* pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkRect& devRect,
const SkStrokeRec& stroke) {
SkVector devStrokeSize;
SkScalar width = stroke.getWidth();
if (width > 0) {
devStrokeSize.set(width, width);
viewMatrix.mapVectors(&devStrokeSize, 1);
devStrokeSize.setAbs(devStrokeSize);
} else {
devStrokeSize.set(SK_Scalar1, SK_Scalar1);
}
const SkScalar dx = devStrokeSize.fX;
const SkScalar dy = devStrokeSize.fY;
const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);
SkScalar spare;
{
SkScalar w = devRect.width() - dx;
SkScalar h = devRect.height() - dy;
spare = SkTMin(w, h);
}
SkRect devOutside(devRect);
devOutside.outset(rx, ry);
bool miterStroke = true;
// For hairlines, make bevel and round joins appear the same as mitered ones.
// small miter limit means right angles show bevel...
if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
stroke.getMiter() < SK_ScalarSqrt2)) {
miterStroke = false;
}
if (spare <= 0 && miterStroke) {
this->fillAARect(target, pipelineBuilder, color, viewMatrix, devOutside, devOutside);
return;
}
SkRect devInside(devRect);
devInside.inset(rx, ry);
SkRect devOutsideAssist(devRect);
// For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
// to draw the outer of the rect. Because there are 8 vertices on the outer
// edge, while vertex number of inner edge is 4, the same as miter-stroke.
if (!miterStroke) {
devOutside.inset(0, ry);
devOutsideAssist.outset(0, ry);
}
this->geometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
devOutsideAssist, devInside, miterStroke);
}
GR_DECLARE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey);
GR_DECLARE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey);
class AAStrokeRectBatch : public GrBatch {
public:
// TODO support AA rotated stroke rects by copying around view matrices
struct Geometry {
GrColor fColor;
SkRect fDevOutside;
SkRect fDevOutsideAssist;
SkRect fDevInside;
bool fMiterStroke;
};
static GrBatch* Create(const Geometry& geometry, const SkMatrix& viewMatrix) {
return SkNEW_ARGS(AAStrokeRectBatch, (geometry, viewMatrix));
}
const char* name() const override { return "AAStrokeRect"; }
void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
// When this is called on a batch, there is only one geometry bundle
out->setKnownFourComponents(fGeoData[0].fColor);
}
void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
out->setUnknownSingleComponent();
}
void initBatchTracker(const GrPipelineInfo& init) override {
// Handle any color overrides
if (init.fColorIgnored) {
fGeoData[0].fColor = GrColor_ILLEGAL;
} else if (GrColor_ILLEGAL != init.fOverrideColor) {
fGeoData[0].fColor = init.fOverrideColor;
}
// setup batch properties
fBatch.fColorIgnored = init.fColorIgnored;
fBatch.fColor = fGeoData[0].fColor;
fBatch.fUsesLocalCoords = init.fUsesLocalCoords;
fBatch.fCoverageIgnored = init.fCoverageIgnored;
fBatch.fMiterStroke = fGeoData[0].fMiterStroke;
fBatch.fCanTweakAlphaForCoverage = init.fCanTweakAlphaForCoverage;
}
void generateGeometry(GrBatchTarget* batchTarget, const GrPipeline* pipeline) override {
bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
// Local matrix is ignored if we don't have local coords. If we have localcoords we only
// batch with identical view matrices
SkMatrix localMatrix;
if (this->usesLocalCoords() && !this->viewMatrix().invert(&localMatrix)) {
SkDebugf("Cannot invert\n");
return;
}
SkAutoTUnref<const GrGeometryProcessor> gp(create_fill_rect_gp(canTweakAlphaForCoverage,
localMatrix));
batchTarget->initDraw(gp, pipeline);
// TODO this is hacky, but the only way we have to initialize the GP is to use the
// GrPipelineInfo struct so we can generate the correct shader. Once we have GrBatch
// everywhere we can remove this nastiness
GrPipelineInfo init;
init.fColorIgnored = fBatch.fColorIgnored;
init.fOverrideColor = GrColor_ILLEGAL;
init.fCoverageIgnored = fBatch.fCoverageIgnored;
init.fUsesLocalCoords = this->usesLocalCoords();
gp->initBatchTracker(batchTarget->currentBatchTracker(), init);
size_t vertexStride = gp->getVertexStride();
SkASSERT(canTweakAlphaForCoverage ?
vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) :
vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
int innerVertexNum = 4;
int outerVertexNum = this->miterStroke() ? 4 : 8;
int verticesPerInstance = (outerVertexNum + innerVertexNum) * 2;
int indicesPerInstance = this->miterStroke() ? kMiterIndexCnt : kBevelIndexCnt;
int instanceCount = fGeoData.count();
const SkAutoTUnref<const GrIndexBuffer> indexBuffer(
GetIndexBuffer(batchTarget->resourceProvider(), this->miterStroke()));
InstancedHelper helper;
void* vertices = helper.init(batchTarget, kTriangles_GrPrimitiveType, vertexStride,
indexBuffer, verticesPerInstance, indicesPerInstance,
instanceCount);
if (!vertices || !indexBuffer) {
SkDebugf("Could not allocate vertices\n");
return;
}
for (int i = 0; i < instanceCount; i++) {
const Geometry& args = fGeoData[i];
this->generateAAStrokeRectGeometry(vertices,
i * verticesPerInstance * vertexStride,
vertexStride,
outerVertexNum,
innerVertexNum,
args.fColor,
args.fDevOutside,
args.fDevOutsideAssist,
args.fDevInside,
args.fMiterStroke,
canTweakAlphaForCoverage);
}
helper.issueDraw(batchTarget);
}
SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
private:
AAStrokeRectBatch(const Geometry& geometry, const SkMatrix& viewMatrix) {
this->initClassID<AAStrokeRectBatch>();
fBatch.fViewMatrix = viewMatrix;
fGeoData.push_back(geometry);
// If we have miterstroke then we inset devOutside and outset devOutsideAssist, so we need
// the join for proper bounds
fBounds = geometry.fDevOutside;
fBounds.join(geometry.fDevOutsideAssist);
}
static const int kMiterIndexCnt = 3 * 24;
static const int kMiterVertexCnt = 16;
static const int kNumMiterRectsInIndexBuffer = 256;
static const int kBevelIndexCnt = 48 + 36 + 24;
static const int kBevelVertexCnt = 24;
static const int kNumBevelRectsInIndexBuffer = 256;
static const GrIndexBuffer* GetIndexBuffer(GrResourceProvider* resourceProvider,
bool miterStroke) {
if (miterStroke) {
static const uint16_t gMiterIndices[] = {
0 + 0, 1 + 0, 5 + 0, 5 + 0, 4 + 0, 0 + 0,
1 + 0, 2 + 0, 6 + 0, 6 + 0, 5 + 0, 1 + 0,
2 + 0, 3 + 0, 7 + 0, 7 + 0, 6 + 0, 2 + 0,
3 + 0, 0 + 0, 4 + 0, 4 + 0, 7 + 0, 3 + 0,
0 + 4, 1 + 4, 5 + 4, 5 + 4, 4 + 4, 0 + 4,
1 + 4, 2 + 4, 6 + 4, 6 + 4, 5 + 4, 1 + 4,
2 + 4, 3 + 4, 7 + 4, 7 + 4, 6 + 4, 2 + 4,
3 + 4, 0 + 4, 4 + 4, 4 + 4, 7 + 4, 3 + 4,
0 + 8, 1 + 8, 5 + 8, 5 + 8, 4 + 8, 0 + 8,
1 + 8, 2 + 8, 6 + 8, 6 + 8, 5 + 8, 1 + 8,
2 + 8, 3 + 8, 7 + 8, 7 + 8, 6 + 8, 2 + 8,
3 + 8, 0 + 8, 4 + 8, 4 + 8, 7 + 8, 3 + 8,
};
GR_STATIC_ASSERT(SK_ARRAY_COUNT(gMiterIndices) == kMiterIndexCnt);
GR_DEFINE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey);
return resourceProvider->refOrCreateInstancedIndexBuffer(gMiterIndices,
kMiterIndexCnt, kNumMiterRectsInIndexBuffer, kMiterVertexCnt,
gMiterIndexBufferKey);
} else {
/**
* As in miter-stroke, index = a + b, and a is the current index, b is the shift
* from the first index. The index layout:
* outer AA line: 0~3, 4~7
* outer edge: 8~11, 12~15
* inner edge: 16~19
* inner AA line: 20~23
* Following comes a bevel-stroke rect and its indices:
*
* 4 7
* *********************************
* * ______________________________ *
* * / 12 15 \ *
* * / \ *
* 0 * |8 16_____________________19 11 | * 3
* * | | | | *
* * | | **************** | | *
* * | | * 20 23 * | | *
* * | | * * | | *
* * | | * 21 22 * | | *
* * | | **************** | | *
* * | |____________________| | *
* 1 * |9 17 18 10| * 2
* * \ / *
* * \13 __________________________14/ *
* * *
* **********************************
* 5 6
*/
static const uint16_t gBevelIndices[] = {
// Draw outer AA, from outer AA line to outer edge, shift is 0.
0 + 0, 1 + 0, 9 + 0, 9 + 0, 8 + 0, 0 + 0,
1 + 0, 5 + 0, 13 + 0, 13 + 0, 9 + 0, 1 + 0,
5 + 0, 6 + 0, 14 + 0, 14 + 0, 13 + 0, 5 + 0,
6 + 0, 2 + 0, 10 + 0, 10 + 0, 14 + 0, 6 + 0,
2 + 0, 3 + 0, 11 + 0, 11 + 0, 10 + 0, 2 + 0,
3 + 0, 7 + 0, 15 + 0, 15 + 0, 11 + 0, 3 + 0,
7 + 0, 4 + 0, 12 + 0, 12 + 0, 15 + 0, 7 + 0,
4 + 0, 0 + 0, 8 + 0, 8 + 0, 12 + 0, 4 + 0,
// Draw the stroke, from outer edge to inner edge, shift is 8.
0 + 8, 1 + 8, 9 + 8, 9 + 8, 8 + 8, 0 + 8,
1 + 8, 5 + 8, 9 + 8,
5 + 8, 6 + 8, 10 + 8, 10 + 8, 9 + 8, 5 + 8,
6 + 8, 2 + 8, 10 + 8,
2 + 8, 3 + 8, 11 + 8, 11 + 8, 10 + 8, 2 + 8,
3 + 8, 7 + 8, 11 + 8,
7 + 8, 4 + 8, 8 + 8, 8 + 8, 11 + 8, 7 + 8,
4 + 8, 0 + 8, 8 + 8,
// Draw the inner AA, from inner edge to inner AA line, shift is 16.
0 + 16, 1 + 16, 5 + 16, 5 + 16, 4 + 16, 0 + 16,
1 + 16, 2 + 16, 6 + 16, 6 + 16, 5 + 16, 1 + 16,
2 + 16, 3 + 16, 7 + 16, 7 + 16, 6 + 16, 2 + 16,
3 + 16, 0 + 16, 4 + 16, 4 + 16, 7 + 16, 3 + 16,
};
GR_STATIC_ASSERT(SK_ARRAY_COUNT(gBevelIndices) == kBevelIndexCnt);
GR_DEFINE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey);
return resourceProvider->refOrCreateInstancedIndexBuffer(gBevelIndices,
kBevelIndexCnt, kNumBevelRectsInIndexBuffer, kBevelVertexCnt,
gBevelIndexBufferKey);
}
}
GrColor color() const { return fBatch.fColor; }
bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
bool canTweakAlphaForCoverage() const { return fBatch.fCanTweakAlphaForCoverage; }
bool colorIgnored() const { return fBatch.fColorIgnored; }
const SkMatrix& viewMatrix() const { return fBatch.fViewMatrix; }
bool miterStroke() const { return fBatch.fMiterStroke; }
bool onCombineIfPossible(GrBatch* t) override {
AAStrokeRectBatch* that = t->cast<AAStrokeRectBatch>();
// TODO batch across miterstroke changes
if (this->miterStroke() != that->miterStroke()) {
return false;
}
// We apply the viewmatrix to the rect points on the cpu. However, if the pipeline uses
// local coords then we won't be able to batch. We could actually upload the viewmatrix
// using vertex attributes in these cases, but haven't investigated that
if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
return false;
}
// In the event of two batches, one who can tweak, one who cannot, we just fall back to
// not tweaking
if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) {
fBatch.fCanTweakAlphaForCoverage = false;
}
if (this->color() != that->color()) {
fBatch.fColor = GrColor_ILLEGAL;
}
fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
this->joinBounds(that->bounds());
return true;
}
void generateAAStrokeRectGeometry(void* vertices,
size_t offset,
size_t vertexStride,
int outerVertexNum,
int innerVertexNum,
GrColor color,
const SkRect& devOutside,
const SkRect& devOutsideAssist,
const SkRect& devInside,
bool miterStroke,
bool tweakAlphaForCoverage) const {
intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;
// We create vertices for four nested rectangles. There are two ramps from 0 to full
// coverage, one on the exterior of the stroke and the other on the interior.
// The following pointers refer to the four rects, from outermost to innermost.
SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vertexStride);
SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vertexStride);
SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts +
(2 * outerVertexNum + innerVertexNum) *
vertexStride);
#ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
// TODO: this only really works if the X & Y margins are the same all around
// the rect (or if they are all >= 1.0).
SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
if (miterStroke) {
inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
} else {
inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom -
devInside.fBottom);
}
SkASSERT(inset >= 0);
#else
SkScalar inset = SK_ScalarHalf;
#endif
if (miterStroke) {
// outermost
set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
// inner two
set_inset_fan(fan1Pos, vertexStride, devOutside, inset, inset);
set_inset_fan(fan2Pos, vertexStride, devInside, -inset, -inset);
// innermost
set_inset_fan(fan3Pos, vertexStride, devInside, SK_ScalarHalf, SK_ScalarHalf);
} else {
SkPoint* fan0AssistPos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(verts +
(outerVertexNum + 4) *
vertexStride);
// outermost
set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
set_inset_fan(fan0AssistPos, vertexStride, devOutsideAssist, -SK_ScalarHalf,
-SK_ScalarHalf);
// outer one of the inner two
set_inset_fan(fan1Pos, vertexStride, devOutside, inset, inset);
set_inset_fan(fan1AssistPos, vertexStride, devOutsideAssist, inset, inset);
// inner one of the inner two
set_inset_fan(fan2Pos, vertexStride, devInside, -inset, -inset);
// innermost
set_inset_fan(fan3Pos, vertexStride, devInside, SK_ScalarHalf, SK_ScalarHalf);
}
// Make verts point to vertex color and then set all the color and coverage vertex attrs
// values. The outermost rect has 0 coverage
verts += sizeof(SkPoint);
for (int i = 0; i < outerVertexNum; ++i) {
if (tweakAlphaForCoverage) {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
} else {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
*reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
}
}
// scale is the coverage for the the inner two rects.
int scale;
if (inset < SK_ScalarHalf) {
scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
SkASSERT(scale >= 0 && scale <= 255);
} else {
scale = 0xff;
}
float innerCoverage = GrNormalizeByteToFloat(scale);
GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
verts += outerVertexNum * vertexStride;
for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) {
if (tweakAlphaForCoverage) {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
} else {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
*reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) =
innerCoverage;
}
}
// The innermost rect has 0 coverage
verts += (outerVertexNum + innerVertexNum) * vertexStride;
for (int i = 0; i < innerVertexNum; ++i) {
if (tweakAlphaForCoverage) {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
} else {
*reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
*reinterpret_cast<GrColor*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
}
}
}
struct BatchTracker {
SkMatrix fViewMatrix;
GrColor fColor;
bool fUsesLocalCoords;
bool fColorIgnored;
bool fCoverageIgnored;
bool fMiterStroke;
bool fCanTweakAlphaForCoverage;
};
BatchTracker fBatch;
SkSTArray<1, Geometry, true> fGeoData;
};
void GrAARectRenderer::geometryStrokeAARect(GrDrawTarget* target,
GrPipelineBuilder* pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& devOutside,
const SkRect& devOutsideAssist,
const SkRect& devInside,
bool miterStroke) {
AAStrokeRectBatch::Geometry geometry;
geometry.fColor = color;
geometry.fDevOutside = devOutside;
geometry.fDevOutsideAssist = devOutsideAssist;
geometry.fDevInside = devInside;
geometry.fMiterStroke = miterStroke;
SkAutoTUnref<GrBatch> batch(AAStrokeRectBatch::Create(geometry, viewMatrix));
target->drawBatch(pipelineBuilder, batch);
}
void GrAARectRenderer::fillAANestedRects(GrDrawTarget* target,
GrPipelineBuilder* pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect rects[2]) {
SkASSERT(viewMatrix.rectStaysRect());
SkASSERT(!rects[1].isEmpty());
SkRect devOutside, devInside;
viewMatrix.mapRect(&devOutside, rects[0]);
// can't call mapRect for devInside since it calls sort
viewMatrix.mapPoints((SkPoint*)&devInside, (const SkPoint*)&rects[1], 2);
if (devInside.isEmpty()) {
this->fillAARect(target, pipelineBuilder, color, viewMatrix, devOutside, devOutside);
return;
}
this->geometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
devOutside, devInside, true);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#ifdef GR_TEST_UTILS
BATCH_TEST_DEFINE(AAFillRectBatch) {
AAFillRectBatch::Geometry geo;
geo.fColor = GrRandomColor(random);
geo.fViewMatrix = GrTest::TestMatrix(random);
geo.fRect = GrTest::TestRect(random);
geo.fDevRect = GrTest::TestRect(random);
return AAFillRectBatch::Create(geo);
}
BATCH_TEST_DEFINE(AAStrokeRectBatch) {
bool miterStroke = random->nextBool();
// Create mock stroke rect
SkRect outside = GrTest::TestRect(random);
SkScalar minDim = SkMinScalar(outside.width(), outside.height());
SkScalar strokeWidth = minDim * 0.1f;
SkRect outsideAssist = outside;
outsideAssist.outset(strokeWidth, strokeWidth);
SkRect inside = outside;
inside.inset(strokeWidth, strokeWidth);
AAStrokeRectBatch::Geometry geo;
geo.fColor = GrRandomColor(random);
geo.fDevOutside = outside;
geo.fDevOutsideAssist = outsideAssist;
geo.fDevInside = inside;
geo.fMiterStroke = miterStroke;
return AAStrokeRectBatch::Create(geo, GrTest::TestMatrix(random));
}
#endif