1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkDrawProcs.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,90 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2011 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +#ifndef SkDrawProcs_DEFINED
1.12 +#define SkDrawProcs_DEFINED
1.13 +
1.14 +#include "SkBlitter.h"
1.15 +#include "SkDraw.h"
1.16 +
1.17 +class SkAAClip;
1.18 +class SkBlitter;
1.19 +
1.20 +struct SkDraw1Glyph {
1.21 + const SkDraw* fDraw;
1.22 + SkBounder* fBounder;
1.23 + const SkRegion* fClip;
1.24 + const SkAAClip* fAAClip;
1.25 + SkBlitter* fBlitter;
1.26 + SkGlyphCache* fCache;
1.27 + const SkPaint* fPaint;
1.28 + SkIRect fClipBounds;
1.29 + /** Half the sampling frequency of the rasterized glyph in x. */
1.30 + SkFixed fHalfSampleX;
1.31 + /** Half the sampling frequency of the rasterized glyph in y. */
1.32 + SkFixed fHalfSampleY;
1.33 +
1.34 + /** Draws one glyph.
1.35 + *
1.36 + * The x and y are pre-biased, so implementations may just truncate them.
1.37 + * i.e. half the sampling frequency has been added.
1.38 + * e.g. 1/2 or 1/(2^(SkGlyph::kSubBits+1)) has already been added.
1.39 + * This added bias can be found in fHalfSampleX,Y.
1.40 + */
1.41 + typedef void (*Proc)(const SkDraw1Glyph&, SkFixed x, SkFixed y, const SkGlyph&);
1.42 +
1.43 + Proc init(const SkDraw* draw, SkBlitter* blitter, SkGlyphCache* cache,
1.44 + const SkPaint&);
1.45 +
1.46 + // call this instead of fBlitter->blitMask() since this wrapper will handle
1.47 + // the case when the mask is ARGB32_Format
1.48 + //
1.49 + void blitMask(const SkMask& mask, const SkIRect& clip) const {
1.50 + if (SkMask::kARGB32_Format == mask.fFormat) {
1.51 + this->blitMaskAsSprite(mask);
1.52 + } else {
1.53 + fBlitter->blitMask(mask, clip);
1.54 + }
1.55 + }
1.56 +
1.57 + // mask must be kARGB32_Format
1.58 + void blitMaskAsSprite(const SkMask& mask) const;
1.59 +};
1.60 +
1.61 +struct SkDrawProcs {
1.62 + SkDraw1Glyph::Proc fD1GProc;
1.63 +};
1.64 +
1.65 +bool SkDrawTreatAAStrokeAsHairline(SkScalar strokeWidth, const SkMatrix&,
1.66 + SkScalar* coverage);
1.67 +
1.68 +/**
1.69 + * If the current paint is set to stroke and the stroke-width when applied to
1.70 + * the matrix is <= 1.0, then this returns true, and sets coverage (simulating
1.71 + * a stroke by drawing a hairline with partial coverage). If any of these
1.72 + * conditions are false, then this returns false and coverage is ignored.
1.73 + */
1.74 +inline bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix,
1.75 + SkScalar* coverage) {
1.76 + if (SkPaint::kStroke_Style != paint.getStyle()) {
1.77 + return false;
1.78 + }
1.79 +
1.80 + SkScalar strokeWidth = paint.getStrokeWidth();
1.81 + if (0 == strokeWidth) {
1.82 + *coverage = SK_Scalar1;
1.83 + return true;
1.84 + }
1.85 +
1.86 + if (!paint.isAntiAlias()) {
1.87 + return false;
1.88 + }
1.89 +
1.90 + return SkDrawTreatAAStrokeAsHairline(strokeWidth, matrix, coverage);
1.91 +}
1.92 +
1.93 +#endif
