/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPaintPriv_DEFINED
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#define SkPaintPriv_DEFINED
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#include "SkPaint.h"
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class SkFont;
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class SkReadBuffer;
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class SkWriteBuffer;
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enum SkReadPaintResult {
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kFailed_ReadPaint,
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kSuccess_JustPaint,
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kSuccess_PaintAndFont,
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};
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class SkPaintPriv {
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public:
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enum ShaderOverrideOpacity {
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kNone_ShaderOverrideOpacity, //!< there is no overriding shader (bitmap or image)
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kOpaque_ShaderOverrideOpacity, //!< the overriding shader is opaque
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kNotOpaque_ShaderOverrideOpacity, //!< the overriding shader may not be opaque
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};
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/**
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* Returns true if drawing with this paint (or nullptr) will ovewrite all affected pixels.
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*
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* Note: returns conservative true, meaning it may return false even though the paint might
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* in fact overwrite its pixels.
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*/
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static bool Overwrites(const SkPaint* paint, ShaderOverrideOpacity);
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static bool ShouldDither(const SkPaint&, SkColorType);
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/*
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* The luminance color is used to determine which Gamma Canonical color to map to. This is
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* really only used by backends which want to cache glyph masks, and need some way to know if
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* they need to generate new masks based off a given color.
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*/
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static SkColor ComputeLuminanceColor(const SkPaint&);
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/** Serializes SkPaint into a buffer. A companion unflatten() call
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can reconstitute the paint at a later time.
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@param buffer SkWriteBuffer receiving the flattened SkPaint data
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*/
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static void Flatten(const SkPaint& paint, SkWriteBuffer& buffer);
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/** Populates SkPaint, typically from a serialized stream, created by calling
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flatten() at an earlier time.
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SkReadBuffer class is not public, so unflatten() cannot be meaningfully called
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by the client.
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Older formats also stored font info in the serialized data. On success, this
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returns if it deserialized just a paint, or both a font and paint. The font
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param is optional.
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@param buffer serialized data describing SkPaint content
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@return false if the buffer contains invalid data
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*/
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static SkReadPaintResult Unflatten(SkPaint* paint, SkReadBuffer& buffer, SkFont* font);
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private:
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static SkReadPaintResult Unflatten_PreV68(SkPaint* paint, SkReadBuffer& buffer, SkFont*);
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};
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#endif
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