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* Copyright 2019 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkStrikeInterface_DEFINED
#define SkStrikeInterface_DEFINED
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkTypes.h"
#include "src/core/SkGlyph.h"
#include "src/core/SkSpan.h"
#include <memory>
class SkDescriptor;
class SkGlyph;
class SkMaskFilter;
class SkPathEffect;
class SkTypeface;
struct SkGlyphPositionRoundingSpec;
struct SkScalerContextEffects;
struct SkGlyphPos {
size_t index;
const SkGlyph* glyph;
SkPoint position;
struct SkPathPos {
const SkPath* path;
SkPoint position;
class SkStrikeForGPU {
virtual ~SkStrikeForGPU() = default;
virtual const SkDescriptor& getDescriptor() const = 0;
// prepareForDrawingRemoveEmpty takes glyphIDs, and position, and returns a list of SkGlyphs
// and positions where all the data to draw the glyph has been created. The maxDimension
// parameter determines if the mask/SDF version will be created, or an alternate drawing
// format should be used. For path-only drawing set maxDimension to 0, and for bitmap-device
// drawing (where there is no upper limit to the glyph in the cache) use INT_MAX.
// prepareForDrawingRemoveEmpty should remove all empty glyphs from the returned span.
virtual SkSpan<const SkGlyphPos>
prepareForDrawingRemoveEmpty(const SkPackedGlyphID packedGlyphIDs[],
const SkPoint positions[],
size_t n,
int maxDimension,
SkGlyphPos results[]) = 0;
virtual const SkGlyphPositionRoundingSpec& roundingSpec() const = 0;
// Used with SkScopedStrikeForGPU to take action at the end of a scope.
virtual void onAboutToExitScope() = 0;
// Common categories for glyph types used by GPU.
static bool CanDrawAsMask(const SkGlyph& glyph);
static bool CanDrawAsSDFT(const SkGlyph& glyph);
static bool CanDrawAsPath(const SkGlyph& glyph);
struct Deleter {
void operator()(SkStrikeForGPU* ptr) const {
using SkScopedStrikeForGPU = std::unique_ptr<SkStrikeForGPU, SkStrikeForGPU::Deleter>;
class SkStrikeForGPUCacheInterface {
virtual ~SkStrikeForGPUCacheInterface() = default;
virtual SkScopedStrikeForGPU findOrCreateScopedStrike(const SkDescriptor& desc,
const SkScalerContextEffects& effects,
const SkTypeface& typeface) = 0;
#endif //SkStrikeInterface_DEFINED