blob: dc16048a59858caade05cf4d05e2aa44645a7a27 [file] [log] [blame]
* Copyright 2023 Google LLC
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkColorTable_DEFINED
#define SkColorTable_DEFINED
#include "include/core/SkBitmap.h"
#include "include/core/SkRefCnt.h"
#include "include/private/base/SkAPI.h"
#include <cstdint>
class SkReadBuffer;
class SkWriteBuffer;
* SkColorTable holds the lookup tables for each channel (ARGB) used to define the filter behavior
* of `SkColorFilters::Table`, and provides a way to share the table data between client code and
* the returned SkColorFilter. Once created, an SkColorTable is immutable.
class SK_API SkColorTable : public SkRefCnt {
// Creates a new SkColorTable with 'table' used for all four channels. The table is copied into
// the SkColorTable.
static sk_sp<SkColorTable> Make(const uint8_t table[256]) {
return Make(table, table, table, table);
// Creates a new SkColorTable with the per-channel lookup tables. Each non-null table is copied
// into the SkColorTable. Null parameters are interpreted as the identity table.
static sk_sp<SkColorTable> Make(const uint8_t tableA[256],
const uint8_t tableR[256],
const uint8_t tableG[256],
const uint8_t tableB[256]);
// Per-channel constant value lookup (0-255).
const uint8_t* alphaTable() const { return fTable.getAddr8(0, 0); }
const uint8_t* redTable() const { return fTable.getAddr8(0, 1); }
const uint8_t* greenTable() const { return fTable.getAddr8(0, 2); }
const uint8_t* blueTable() const { return fTable.getAddr8(0, 3); }
void flatten(SkWriteBuffer& buffer) const;
static sk_sp<SkColorTable> Deserialize(SkReadBuffer& buffer);
friend class SkTableColorFilter; // for bitmap()
SkColorTable(const SkBitmap& table) : fTable(table) {}
// The returned SkBitmap is immutable; attempting to modify its pixel data will trigger asserts
// in debug builds and cause undefined behavior in release builds.
const SkBitmap& bitmap() const { return fTable; }
SkBitmap fTable; // A 256x4 A8 image
#endif // SkColorTable_DEFINED