diff options
author | reed@android.com <reed@android.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2008-12-19 18:24:35 +0000 |
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committer | reed@android.com <reed@android.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2008-12-19 18:24:35 +0000 |
commit | 6efdc47afc8bb24603fc0d15146ada609b728f2f (patch) | |
tree | 30fb21750ba6ab3de207c29a90b522d653af2b32 /src/core/SkGeometry.h | |
parent | 647254a7fd78090f64027383ff98e7ff2cc2667b (diff) |
first cut at event-based test app
git-svn-id: http://skia.googlecode.com/svn/trunk@37 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src/core/SkGeometry.h')
-rw-r--r-- | src/core/SkGeometry.h | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/src/core/SkGeometry.h b/src/core/SkGeometry.h deleted file mode 100644 index 571159fd07..0000000000 --- a/src/core/SkGeometry.h +++ /dev/null @@ -1,163 +0,0 @@ -/* libs/graphics/sgl/SkGeometry.h -** -** Copyright 2006, The Android Open Source Project -** -** Licensed under the Apache License, Version 2.0 (the "License"); -** you may not use this file except in compliance with the License. -** You may obtain a copy of the License at -** -** http://www.apache.org/licenses/LICENSE-2.0 -** -** Unless required by applicable law or agreed to in writing, software -** distributed under the License is distributed on an "AS IS" BASIS, -** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -** See the License for the specific language governing permissions and -** limitations under the License. -*/ - -#ifndef SkGeometry_DEFINED -#define SkGeometry_DEFINED - -#include "SkMatrix.h" - -/** Given a quadratic equation Ax^2 + Bx + C = 0, return 0, 1, 2 roots for the - equation. -*/ -int SkFindUnitQuadRoots(SkScalar A, SkScalar B, SkScalar C, SkScalar roots[2]); - -/////////////////////////////////////////////////////////////////////////////// - -/** Set pt to the point on the src quadratic specified by t. t must be - 0 <= t <= 1.0 -*/ -void SkEvalQuadAt(const SkPoint src[3], SkScalar t, SkPoint* pt, SkVector* tangent = NULL); -void SkEvalQuadAtHalf(const SkPoint src[3], SkPoint* pt, SkVector* tangent = NULL); - -/** Given a src quadratic bezier, chop it at the specified t value, - where 0 < t < 1, and return the two new quadratics in dst: - dst[0..2] and dst[2..4] -*/ -void SkChopQuadAt(const SkPoint src[3], SkPoint dst[5], SkScalar t); - -/** Given a src quadratic bezier, chop it at the specified t == 1/2, - The new quads are returned in dst[0..2] and dst[2..4] -*/ -void SkChopQuadAtHalf(const SkPoint src[3], SkPoint dst[5]); - -/** Given the 3 coefficients for a quadratic bezier (either X or Y values), look - for extrema, and return the number of t-values that are found that represent - these extrema. If the quadratic has no extrema betwee (0..1) exclusive, the - function returns 0. - Returned count tValues[] - 0 ignored - 1 0 < tValues[0] < 1 -*/ -int SkFindQuadExtrema(SkScalar a, SkScalar b, SkScalar c, SkScalar tValues[1]); - -/** Given 3 points on a quadratic bezier, chop it into 1, 2 beziers such that - the resulting beziers are monotonic in Y. This is called by the scan converter. - Depending on what is returned, dst[] is treated as follows - 1 dst[0..2] is the original quad - 2 dst[0..2] and dst[2..4] are the two new quads - If dst == null, it is ignored and only the count is returned. -*/ -int SkChopQuadAtYExtrema(const SkPoint src[3], SkPoint dst[5]); - -/** Given 3 points on a quadratic bezier, divide it into 2 quadratics - if the point of maximum curvature exists on the quad segment. - Depending on what is returned, dst[] is treated as follows - 1 dst[0..2] is the original quad - 2 dst[0..2] and dst[2..4] are the two new quads - If dst == null, it is ignored and only the count is returned. -*/ -int SkChopQuadAtMaxCurvature(const SkPoint src[3], SkPoint dst[5]); - -//////////////////////////////////////////////////////////////////////////////////////// - -/** Convert from parametric from (pts) to polynomial coefficients - coeff[0]*T^3 + coeff[1]*T^2 + coeff[2]*T + coeff[3] -*/ -void SkGetCubicCoeff(const SkPoint pts[4], SkScalar cx[4], SkScalar cy[4]); - -/** Set pt to the point on the src cubic specified by t. t must be - 0 <= t <= 1.0 -*/ -void SkEvalCubicAt(const SkPoint src[4], SkScalar t, SkPoint* locOrNull, SkVector* tangentOrNull, SkVector* curvatureOrNull); - -/** Given a src cubic bezier, chop it at the specified t value, - where 0 < t < 1, and return the two new cubics in dst: - dst[0..3] and dst[3..6] -*/ -void SkChopCubicAt(const SkPoint src[4], SkPoint dst[7], SkScalar t); -void SkChopCubicAt(const SkPoint src[4], SkPoint dst[7], const SkScalar t[], int t_count); - -/** Given a src cubic bezier, chop it at the specified t == 1/2, - The new cubics are returned in dst[0..3] and dst[3..6] -*/ -void SkChopCubicAtHalf(const SkPoint src[4], SkPoint dst[7]); - -/** Given the 4 coefficients for a cubic bezier (either X or Y values), look - for extrema, and return the number of t-values that are found that represent - these extrema. If the cubic has no extrema betwee (0..1) exclusive, the - function returns 0. - Returned count tValues[] - 0 ignored - 1 0 < tValues[0] < 1 - 2 0 < tValues[0] < tValues[1] < 1 -*/ -int SkFindCubicExtrema(SkScalar a, SkScalar b, SkScalar c, SkScalar d, SkScalar tValues[2]); - -/** Given 4 points on a cubic bezier, chop it into 1, 2, 3 beziers such that - the resulting beziers are monotonic in Y. This is called by the scan converter. - Depending on what is returned, dst[] is treated as follows - 1 dst[0..3] is the original cubic - 2 dst[0..3] and dst[3..6] are the two new cubics - 3 dst[0..3], dst[3..6], dst[6..9] are the three new cubics - If dst == null, it is ignored and only the count is returned. -*/ -int SkChopCubicAtYExtrema(const SkPoint src[4], SkPoint dst[10]); - -/** Given a cubic bezier, return 0, 1, or 2 t-values that represent the - inflection points. -*/ -int SkFindCubicInflections(const SkPoint src[4], SkScalar tValues[2]); - -/** Return 1 for no chop, or 2 for having chopped the cubic at its - inflection point. -*/ -int SkChopCubicAtInflections(const SkPoint src[4], SkPoint dst[10]); - -int SkFindCubicMaxCurvature(const SkPoint src[4], SkScalar tValues[3]); -int SkChopCubicAtMaxCurvature(const SkPoint src[4], SkPoint dst[13], SkScalar tValues[3] = NULL); - -/////////////////////////////////////////////////////////////////////////////////////////// - -enum SkRotationDirection { - kCW_SkRotationDirection, - kCCW_SkRotationDirection -}; - -/** Maximum number of points needed in the quadPoints[] parameter for - SkBuildQuadArc() -*/ -#define kSkBuildQuadArcStorage 17 - -/** Given 2 unit vectors and a rotation direction, fill out the specified - array of points with quadratic segments. Return is the number of points - written to, which will be { 0, 3, 5, 7, ... kSkBuildQuadArcStorage } - - matrix, if not null, is appled to the points before they are returned. -*/ -int SkBuildQuadArc(const SkVector& unitStart, const SkVector& unitStop, SkRotationDirection, - const SkMatrix* matrix, SkPoint quadPoints[]); - -////////////////////////////////////////////////////////////////////////////// - -#ifdef SK_DEBUG - class SkGeometry { - public: - static void UnitTest(); - }; -#endif - -#endif |