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
76 lines
2.4 KiB
C++
76 lines
2.4 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_D(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);
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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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SkDEBUGCODE(int top = static_cast<int>(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 SkDScalar SkDScalar_setMul(SkScalar a, SkScalar b) {
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return (SkDScalar) ((SkDScalar) a * (SkDScalar) b);
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}
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static void computeOuterProduct(SkMatrix* matrix,
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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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SkDScalar tmp[4];
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sk_bzero(tmp, sizeof(tmp));
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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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tmp[0] += SkDScalar_setMul(x0, x1);
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tmp[1] += SkDScalar_setMul(x0, y1);
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tmp[2] += SkDScalar_setMul(y0, x1);
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tmp[3] += SkDScalar_setMul(y0, y1);
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}
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matrix->reset();
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matrix->setScaleX(SkDScalar_toScalar(tmp[0]));
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matrix->setSkewY( SkDScalar_toScalar(tmp[1]));
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matrix->setSkewX( SkDScalar_toScalar(tmp[2]));
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matrix->setScaleY(SkDScalar_toScalar(tmp[3]));
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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(SkDScalar_setMul(ax, bx) +
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SkDScalar_setMul(ay, by));
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}
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bool SkSetPoly3To3_D(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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SkMatrix srcOP, dstOP;
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computeOuterProduct(&srcOP, src, srcAve, src, srcAve);
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if (!srcOP.invert(&srcOP)) {
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return false;
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}
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computeOuterProduct(&dstOP, src, srcAve, dst, dstAve);
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matrix->setConcat(dstOP, srcOP);
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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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