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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrCCPathProcessor_DEFINED
#define GrCCPathProcessor_DEFINED
#include "GrCaps.h"
#include "GrGeometryProcessor.h"
#include "SkPath.h"
#include <array>
class GrCCPathCacheEntry;
class GrCCPerFlushResources;
class GrOnFlushResourceProvider;
class GrOpFlushState;
class GrPipeline;
/**
* This class draws AA paths using the coverage count masks produced by GrCCCoverageProcessor.
*
* Paths are drawn as bloated octagons, and coverage is derived from the coverage count mask and
* fill rule.
*
* To draw paths, the caller must set up an instance buffer as detailed below, then call drawPaths()
* providing its own instance buffer alongside the buffers found by calling FindIndexBuffer/
* FindVertexBuffer.
*/
class GrCCPathProcessor : public GrGeometryProcessor {
public:
enum class InstanceAttribs {
kDevBounds,
kDevBounds45,
kDevToAtlasOffset,
kColor
};
static constexpr int kNumInstanceAttribs = 1 + (int)InstanceAttribs::kColor;
// Helper to offset the 45-degree bounding box returned by GrCCPathParser::parsePath().
static SkRect MakeOffset45(const SkRect& devBounds45, float dx, float dy) {
// devBounds45 is in "| 1 -1 | * devCoords" space.
// | 1 1 |
return devBounds45.makeOffset(dx - dy, dx + dy);
}
enum class DoEvenOddFill : bool {
kNo = false,
kYes = true
};
struct Instance {
SkRect fDevBounds; // "right < left" indicates even-odd fill type.
SkRect fDevBounds45; // Bounding box in "| 1 -1 | * devCoords" space.
// | 1 1 |
SkIVector fDevToAtlasOffset; // Translation from device space to location in atlas.
GrColor fColor;
void set(const SkRect& devBounds, const SkRect& devBounds45,
const SkIVector& devToAtlasOffset, GrColor, DoEvenOddFill = DoEvenOddFill::kNo);
void set(const GrCCPathCacheEntry&, const SkIVector& shift, GrColor,
DoEvenOddFill = DoEvenOddFill::kNo);
};
GR_STATIC_ASSERT(4 * 11 == sizeof(Instance));
static sk_sp<const GrBuffer> FindVertexBuffer(GrOnFlushResourceProvider*);
static sk_sp<const GrBuffer> FindIndexBuffer(GrOnFlushResourceProvider*);
GrCCPathProcessor(GrResourceProvider*, sk_sp<GrTextureProxy> atlas,
const SkMatrix& viewMatrixIfUsingLocalCoords = SkMatrix::I());
const char* name() const override { return "GrCCPathProcessor"; }
const GrSurfaceProxy* atlasProxy() const { return fAtlasAccess.proxy(); }
const GrTexture* atlas() const { return fAtlasAccess.peekTexture(); }
const SkMatrix& localMatrix() const { return fLocalMatrix; }
const Attribute& getInstanceAttrib(InstanceAttribs attribID) const {
int idx = static_cast<int>(attribID);
SkASSERT(idx >= 0 && idx < static_cast<int>(SK_ARRAY_COUNT(kInstanceAttribs)));
return kInstanceAttribs[idx];
}
const Attribute& getEdgeNormsAttrib() const { return kEdgeNormsAttrib; }
void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override;
void drawPaths(GrOpFlushState*, const GrPipeline&, const GrCCPerFlushResources&,
int baseInstance, int endInstance, const SkRect& bounds) const;
private:
const Attribute& onVertexAttribute(int i) const override { return kEdgeNormsAttrib; }
const Attribute& onInstanceAttribute(int i) const override { return kInstanceAttribs[i]; }
const TextureSampler fAtlasAccess;
SkMatrix fLocalMatrix;
static constexpr Attribute kInstanceAttribs[kNumInstanceAttribs] = {
{"devbounds", kFloat4_GrVertexAttribType},
{"devbounds45", kFloat4_GrVertexAttribType},
{"dev_to_atlas_offset", kInt2_GrVertexAttribType},
{"color", kUByte4_norm_GrVertexAttribType}
};
static constexpr Attribute kEdgeNormsAttrib = {"edge_norms", kFloat4_GrVertexAttribType};
typedef GrGeometryProcessor INHERITED;
};
inline void GrCCPathProcessor::Instance::set(const SkRect& devBounds, const SkRect& devBounds45,
const SkIVector& devToAtlasOffset, GrColor color,
DoEvenOddFill doEvenOddFill) {
if (DoEvenOddFill::kYes == doEvenOddFill) {
// "right < left" indicates even-odd fill type.
fDevBounds.setLTRB(devBounds.fRight, devBounds.fTop, devBounds.fLeft, devBounds.fBottom);
} else {
fDevBounds = devBounds;
}
fDevBounds45 = devBounds45;
fDevToAtlasOffset = devToAtlasOffset;
fColor = color;
}
#endif
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