9da0cea3a3
Fix these class of warnings: - unused functions - unused locals - sign mismatch - missing function prototypes - missing newline at end of file - 64 to 32 bit truncation The changes prefer to link in dead code in the debug build with 'if (false)' than to comment it out, but trivial cases are commented out or sometimes deleted if it appears to be a copy/paste error. Review URL: https://codereview.appspot.com/6307044 git-svn-id: http://skia.googlecode.com/svn/trunk@4187 2bbb7eff-a529-9590-31e7-b0007b416f81
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkMatrix.h"
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// FIXME: needs to be in a header
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bool SkSetPoly3To3_A(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);
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#ifdef SK_SCALAR_IS_FIXED
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typedef int64_t SkDScalar;
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static SkScalar SkDScalar_toScalar(SkDScalar value) {
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SkDScalar result = (value + (1 << 15)) >> 16;
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int top = result >> 31;
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SkASSERT(top == 0 || top == -1);
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return (SkScalar)result;
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}
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static SkScalar divide(SkDScalar numer, SkDScalar denom) {
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denom >>= 16;
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return numer / denom;
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}
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#else
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typedef double SkDScalar;
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static SkScalar SkDScalar_toScalar(SkDScalar value) {
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return static_cast<float>(value);
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}
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static SkScalar divide(SkDScalar numer, SkDScalar denom) {
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return static_cast<float>(numer / denom);
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}
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#endif
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static SkDScalar SkDScalar_setMul(SkScalar a, SkScalar b) {
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return (SkDScalar) ((SkDScalar) a * b);
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}
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static void computeOuterProduct(SkScalar op[4],
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const SkPoint pts0[3], const SkPoint& ave0,
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const SkPoint pts1[3], const SkPoint& ave1) {
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sk_bzero(op, 4 * sizeof(op[0]));
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for (int i = 0; i < 3; i++) {
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SkScalar x0 = pts0[i].fX - ave0.fX;
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SkScalar y0 = pts0[i].fY - ave0.fY;
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SkScalar x1 = pts1[i].fX - ave1.fX;
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SkScalar y1 = pts1[i].fY - ave1.fY;
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op[0] += SkScalarMul(x0, x1);
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op[1] += SkScalarMul(x0, y1);
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op[2] += SkScalarMul(y0, x1);
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op[3] += SkScalarMul(y0, y1);
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}
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}
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static SkDScalar ddot(SkScalar ax, SkScalar ay, SkScalar bx, SkScalar by) {
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return SkDScalar_setMul(ax, bx) + SkDScalar_setMul(ay, by);
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}
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static SkScalar dot(SkScalar ax, SkScalar ay, SkScalar bx, SkScalar by) {
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return SkDScalar_toScalar(ddot(ax, ay, bx, by));
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}
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bool SkSetPoly3To3_A(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]) {
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const SkPoint& srcAve = src[0];
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const SkPoint& dstAve = dst[0];
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SkScalar srcOP[4], dstOP[4];
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computeOuterProduct(srcOP, src, srcAve, src, srcAve);
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computeOuterProduct(dstOP, src, srcAve, dst, dstAve);
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SkDScalar det = SkDScalar_setMul(srcOP[0], srcOP[3]) -
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SkDScalar_setMul(srcOP[1], srcOP[2]);
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SkDScalar M[4];
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const SkScalar srcOP0 = srcOP[3];
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const SkScalar srcOP1 = -srcOP[1];
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const SkScalar srcOP2 = -srcOP[2];
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const SkScalar srcOP3 = srcOP[0];
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M[0] = ddot(srcOP0, srcOP1, dstOP[0], dstOP[2]);
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M[1] = ddot(srcOP2, srcOP3, dstOP[0], dstOP[2]);
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M[2] = ddot(srcOP0, srcOP1, dstOP[1], dstOP[3]);
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M[3] = ddot(srcOP2, srcOP3, dstOP[1], dstOP[3]);
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matrix->reset();
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matrix->setScaleX(divide(M[0], det));
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matrix->setSkewX( divide(M[1], det));
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matrix->setSkewY (divide(M[2], det));
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matrix->setScaleY(divide(M[3], det));
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matrix->setTranslateX(dstAve.fX - dot(srcAve.fX, srcAve.fY,
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matrix->getScaleX(), matrix->getSkewX()));
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matrix->setTranslateY(dstAve.fY - dot(srcAve.fX, srcAve.fY,
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matrix->getSkewY(), matrix->getScaleY()));
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return true;
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}
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