| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkDrawProcs_DEFINED |
| #define SkDrawProcs_DEFINED |
| |
| #include "SkDraw.h" |
| #include "SkGlyph.h" |
| |
| bool SkDrawTreatAAStrokeAsHairline(SkScalar strokeWidth, const SkMatrix&, |
| SkScalar* coverage); |
| |
| /** |
| * If the current paint is set to stroke and the stroke-width when applied to |
| * the matrix is <= 1.0, then this returns true, and sets coverage (simulating |
| * a stroke by drawing a hairline with partial coverage). If any of these |
| * conditions are false, then this returns false and coverage is ignored. |
| */ |
| inline bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix, |
| SkScalar* coverage) { |
| if (SkPaint::kStroke_Style != paint.getStyle()) { |
| return false; |
| } |
| |
| SkScalar strokeWidth = paint.getStrokeWidth(); |
| if (0 == strokeWidth) { |
| *coverage = SK_Scalar1; |
| return true; |
| } |
| |
| if (!paint.isAntiAlias()) { |
| return false; |
| } |
| |
| return SkDrawTreatAAStrokeAsHairline(strokeWidth, matrix, coverage); |
| } |
| |
| class SkTextAlignProc { |
| public: |
| SkTextAlignProc(SkPaint::Align align) |
| : fAlign(align) { |
| } |
| |
| // Returns the glyph position, which may be rounded or not by the caller |
| // e.g. subpixel doesn't round. |
| void operator()(const SkPoint& loc, const SkGlyph& glyph, SkPoint* dst) { |
| if (SkPaint::kLeft_Align == fAlign) { |
| dst->set(loc.fX, loc.fY); |
| } else if (SkPaint::kCenter_Align == fAlign) { |
| dst->set(loc.fX - SkFloatToScalar(glyph.fAdvanceX) / 2, |
| loc.fY - SkFloatToScalar(glyph.fAdvanceY) / 2); |
| } else { |
| SkASSERT(SkPaint::kRight_Align == fAlign); |
| dst->set(loc.fX - SkFloatToScalar(glyph.fAdvanceX), |
| loc.fY - SkFloatToScalar(glyph.fAdvanceY)); |
| } |
| } |
| private: |
| const SkPaint::Align fAlign; |
| }; |
| |
| #endif |
