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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 "SkPaint.h"
#include "SkMatrix.h"
class SkBitmap;
class SkImage;
class SkPaintPriv {
public:
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);
};
#endif
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