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* Copyright 2013 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkPaintPriv_DEFINED
#define SkPaintPriv_DEFINED
#include "SkImageInfo.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkTypeface.h"
class SkBitmap;
class SkImage;
class SkReadBuffer;
class SkWriteBuffer;
class SkPaintPriv {
enum ShaderOverrideOpacity {
kNone_ShaderOverrideOpacity, //!< there is no overriding shader (bitmap or image)
kOpaque_ShaderOverrideOpacity, //!< the overriding shader is opaque
kNotOpaque_ShaderOverrideOpacity, //!< the overriding shader may not be opaque
* Returns true if drawing with this paint (or nullptr) will ovewrite all affected pixels.
* Note: returns conservative true, meaning it may return false even though the paint might
* in fact overwrite its pixels.
static bool Overwrites(const SkPaint* paint, ShaderOverrideOpacity);
static bool Overwrites(const SkPaint& paint) {
return Overwrites(&paint, kNone_ShaderOverrideOpacity);
* Returns true if drawing this bitmap with this paint (or nullptr) will ovewrite all affected
* pixels.
static bool Overwrites(const SkBitmap&, const SkPaint* paint);
* Returns true if drawing this image with this paint (or nullptr) will ovewrite all affected
* pixels.
static bool Overwrites(const SkImage*, const SkPaint* paint);
static void ScaleFontMetrics(SkPaint::FontMetrics*, SkScalar);
* Return a matrix that applies the paint's text values: size, scale, skew
static void MakeTextMatrix(SkMatrix* matrix, SkScalar size, SkScalar scaleX, SkScalar skewX) {
matrix->setScale(size * scaleX, size);
if (skewX) {
matrix->postSkew(skewX, 0);
static void MakeTextMatrix(SkMatrix* matrix, const SkPaint& paint) {
MakeTextMatrix(matrix, paint.getTextSize(), paint.getTextScaleX(), paint.getTextSkewX());
static bool ShouldDither(const SkPaint&, SkColorType);
// returns 0 if buffer is invalid for specified encoding
static int ValidCountText(const void* text, size_t length, SkPaint::TextEncoding);
static SkTypeface* GetTypefaceOrDefault(const SkPaint& paint) {
return paint.getTypeface() ? paint.getTypeface() : SkTypeface::GetDefaultTypeface();
static sk_sp<SkTypeface> RefTypefaceOrDefault(const SkPaint& paint) {
return paint.getTypeface() ? paint.refTypeface() : SkTypeface::MakeDefault();
/** Serializes SkPaint into a buffer. A companion unflatten() call
can reconstitute the paint at a later time.
@param buffer SkWriteBuffer receiving the flattened SkPaint data
static void Flatten(const SkPaint& paint, SkWriteBuffer& buffer);
/** Populates SkPaint, typically from a serialized stream, created by calling
flatten() at an earlier time.
SkReadBuffer class is not public, so unflatten() cannot be meaningfully called
by the client.
@param buffer serialized data describing SkPaint content
@return false if the buffer contains invalid data
static bool Unflatten(SkPaint* paint, SkReadBuffer& buffer);