add gpu backend (not hooked up yet)
git-svn-id: http://skia.googlecode.com/svn/trunk@649 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrMatrix.cpp b/gpu/src/GrMatrix.cpp
new file mode 100644
index 0000000..e4360cd
--- /dev/null
+++ b/gpu/src/GrMatrix.cpp
@@ -0,0 +1,767 @@
+/*
+ Copyright 2010 Google Inc.
+
+ 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.
+ */
+
+
+#include "GrMatrix.h"
+#include "GrRect.h"
+#include <stddef.h>
+
+#if GR_SCALAR_IS_FLOAT
+ const GrScalar GrMatrix::gRESCALE(GR_Scalar1);
+#else
+ GR_STATIC_ASSERT(GR_SCALAR_IS_FIXED);
+ // fixed point isn't supported right now
+ GR_STATIC_ASSERT(false);
+const GrScalar GrMatrix::gRESCALE(1 << 30);
+#endif
+
+const GrMatrix::MapProc GrMatrix::gMapProcs[] = {
+// Scales are not both zero
+ &GrMatrix::mapIdentity,
+ &GrMatrix::mapScale,
+ &GrMatrix::mapTranslate,
+ &GrMatrix::mapScaleAndTranslate,
+ &GrMatrix::mapSkew,
+ &GrMatrix::mapScaleAndSkew,
+ &GrMatrix::mapSkewAndTranslate,
+ &GrMatrix::mapNonPerspective,
+ // no optimizations for perspective matrices
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapPerspective,
+
+// Scales are zero (every other is invalid because kScale_TypeBit must be set if
+// kZeroScale_TypeBit is set)
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapZero,
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapSetToTranslate,
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapSwappedScale,
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapSwappedScaleAndTranslate,
+
+ // no optimizations for perspective matrices
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapZero,
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapPerspective,
+ &GrMatrix::mapInvalid,
+ &GrMatrix::mapPerspective,
+};
+
+const GrMatrix& GrMatrix::I() {
+ struct FakeMatrix {
+ int fTypeMask;
+ GrScalar fM[9];
+ };
+
+#if 0
+ GR_STATIC_ASSERT(offsetof(FakeMatrix, fTypeMask) == offsetof(GrMatrix, fTypeMask));
+ GR_STATIC_ASSERT(offsetof(FakeMatrix, fM) == offsetof(GrMatrix, fM));
+#endif
+
+ GR_STATIC_ASSERT(sizeof(FakeMatrix) == sizeof(GrMatrix));
+ static const FakeMatrix I = {0,
+ {GR_Scalar1, 0, 0,
+ 0, GR_Scalar1, 0,
+ 0, 0, gRESCALE}};
+ return *(const GrMatrix*)&I;
+}
+
+void GrMatrix::setIdentity() {
+ fM[0] = GR_Scalar1; fM[1] = 0; fM[2] = 0;
+ fM[3] = 0; fM[4] = GR_Scalar1; fM[5] = 0;
+ fM[6] = 0; fM[7] = 0; fM[8] = gRESCALE;
+ fTypeMask = 0;
+}
+
+void GrMatrix::setTranslate(GrScalar dx, GrScalar dy) {
+ fM[0] = GR_Scalar1; fM[1] = 0; fM[2] = dx;
+ fM[3] = 0; fM[4] = GR_Scalar1; fM[5] = dy;
+ fM[6] = 0; fM[7] = 0; fM[8] = gRESCALE;
+ fTypeMask = kTranslate_TypeBit;
+}
+
+void GrMatrix::setScale(GrScalar sx, GrScalar sy) {
+ fM[0] = sx; fM[1] = 0; fM[2] = 0;
+ fM[3] = 0; fM[4] = sy; fM[5] = 0;
+ fM[6] = 0; fM[7] = 0; fM[8] = gRESCALE;
+ fTypeMask = kScale_TypeBit;
+}
+
+void GrMatrix::setSkew(GrScalar skx, GrScalar sky) {
+ fM[0] = GR_Scalar1; fM[1] = skx; fM[2] = 0;
+ fM[3] = sky; fM[4] = GR_Scalar1; fM[5] = 0;
+ fM[6] = 0; fM[7] = 0; fM[8] = gRESCALE;
+ fTypeMask = kSkew_TypeBit;
+}
+
+void GrMatrix::setConcat(const GrMatrix& a, const GrMatrix& b) {
+ if (a.isIdentity()) {
+ if (this != &b) {
+ for (int i = 0; i < 9; ++i) {
+ fM[i] = b.fM[i];
+ }
+ fTypeMask = b.fTypeMask;
+ }
+ return;
+ }
+
+ if (b.isIdentity()) {
+ GrAssert(!a.isIdentity());
+ if (this != &a) {
+ for (int i = 0; i < 9; ++i) {
+ fM[i] = a.fM[i];
+ }
+ fTypeMask = a.fTypeMask;
+ }
+ return;
+ }
+
+ // a and/or b could be this
+ GrMatrix tmp;
+
+ // could do more optimizations based on type bits. Hopefully this call is
+ // low frequency.
+ // TODO: make this work for fixed point
+ if (!((b.fTypeMask | a.fTypeMask) & kPerspective_TypeBit)) {
+ tmp.fM[0] = a.fM[0] * b.fM[0] + a.fM[1] * b.fM[3];
+ tmp.fM[1] = a.fM[0] * b.fM[1] + a.fM[1] * b.fM[4];
+ tmp.fM[2] = a.fM[0] * b.fM[2] + a.fM[1] * b.fM[5] + a.fM[2] * gRESCALE;
+
+ tmp.fM[3] = a.fM[3] * b.fM[0] + a.fM[4] * b.fM[3];
+ tmp.fM[4] = a.fM[3] * b.fM[1] + a.fM[4] * b.fM[4];
+ tmp.fM[5] = a.fM[3] * b.fM[2] + a.fM[4] * b.fM[5] + a.fM[5] * gRESCALE;
+
+ tmp.fM[6] = 0;
+ tmp.fM[7] = 0;
+ tmp.fM[8] = gRESCALE * gRESCALE;
+ } else {
+ tmp.fM[0] = a.fM[0] * b.fM[0] + a.fM[1] * b.fM[3] + a.fM[2] * b.fM[6];
+ tmp.fM[1] = a.fM[0] * b.fM[1] + a.fM[1] * b.fM[4] + a.fM[2] * b.fM[7];
+ tmp.fM[2] = a.fM[0] * b.fM[2] + a.fM[1] * b.fM[5] + a.fM[2] * b.fM[8];
+
+ tmp.fM[3] = a.fM[3] * b.fM[0] + a.fM[4] * b.fM[3] + a.fM[5] * b.fM[6];
+ tmp.fM[4] = a.fM[3] * b.fM[1] + a.fM[4] * b.fM[4] + a.fM[5] * b.fM[7];
+ tmp.fM[5] = a.fM[3] * b.fM[2] + a.fM[4] * b.fM[5] + a.fM[5] * b.fM[8];
+
+ tmp.fM[6] = a.fM[6] * b.fM[0] + a.fM[7] * b.fM[3] + a.fM[8] * b.fM[6];
+ tmp.fM[7] = a.fM[6] * b.fM[1] + a.fM[7] * b.fM[4] + a.fM[8] * b.fM[7];
+ tmp.fM[8] = a.fM[6] * b.fM[2] + a.fM[7] * b.fM[5] + a.fM[8] * b.fM[8];
+ }
+ *this = tmp;
+ setTypeMask();
+}
+
+void GrMatrix::preConcat(const GrMatrix& m) {
+ setConcat(*this, m);
+}
+
+void GrMatrix::postConcat(const GrMatrix& m) {
+ setConcat(m, *this);
+}
+
+double GrMatrix::determinant() const {
+ if (fTypeMask & kPerspective_TypeBit) {
+ return fM[0]*((double)fM[4]*fM[8] - (double)fM[5]*fM[7]) +
+ fM[1]*((double)fM[5]*fM[6] - (double)fM[3]*fM[8]) +
+ fM[2]*((double)fM[3]*fM[7] - (double)fM[4]*fM[6]);
+ } else {
+ return (double)fM[0]*fM[4]*gRESCALE -
+ (double)fM[1]*fM[3]*gRESCALE;
+ }
+}
+
+bool GrMatrix::invert(GrMatrix* inverted) const {
+
+ if (isIdentity()) {
+ if (inverted != this) {
+ inverted->setIdentity();
+ }
+ return true;
+ }
+ static const double MIN_DETERMINANT_SQUARED = 1.e-16;
+
+ // could do more optimizations based on type bits. Hopefully this call is
+ // low frequency.
+
+ double det = determinant();
+
+ // check if we can't be inverted
+ if (det*det <= MIN_DETERMINANT_SQUARED) {
+ return false;
+ } else if (NULL == inverted) {
+ return true;
+ }
+
+ double t[9];
+
+ if (fTypeMask & kPerspective_TypeBit) {
+ t[0] = ((double)fM[4]*fM[8] - (double)fM[5]*fM[7]);
+ t[1] = ((double)fM[2]*fM[7] - (double)fM[1]*fM[8]);
+ t[2] = ((double)fM[1]*fM[5] - (double)fM[2]*fM[4]);
+ t[3] = ((double)fM[5]*fM[6] - (double)fM[3]*fM[8]);
+ t[4] = ((double)fM[0]*fM[8] - (double)fM[2]*fM[6]);
+ t[5] = ((double)fM[2]*fM[3] - (double)fM[0]*fM[5]);
+ t[6] = ((double)fM[3]*fM[7] - (double)fM[4]*fM[6]);
+ t[7] = ((double)fM[1]*fM[6] - (double)fM[0]*fM[7]);
+ t[8] = ((double)fM[0]*fM[4] - (double)fM[1]*fM[3]);
+ det = 1.0 / det;
+ for (int i = 0; i < 9; ++i) {
+ inverted->fM[i] = (GrScalar)(t[i] * det);
+ }
+ } else {
+ t[0] = (double)fM[4]*gRESCALE;
+ t[1] = -(double)fM[1]*gRESCALE;
+ t[2] = (double)fM[1]*fM[5] - (double)fM[2]*fM[4];
+ t[3] = -(double)fM[3]*gRESCALE;
+ t[4] = (double)fM[0]*gRESCALE;
+ t[5] = (double)fM[2]*fM[3] - (double)fM[0]*fM[5];
+ //t[6] = 0.0;
+ //t[7] = 0.0;
+ t[8] = (double)fM[0]*fM[4] - (double)fM[1]*fM[3];
+ det = 1.0 / det;
+ for (int i = 0; i < 6; ++i) {
+ inverted->fM[i] = (GrScalar)(t[i] * det);
+ }
+ inverted->fM[6] = 0;
+ inverted->fM[7] = 0;
+ inverted->fM[8] = (GrScalar)(t[8] * det);
+ }
+ inverted->setTypeMask();
+ return true;
+}
+
+void GrMatrix::mapRect(GrRect* dst, const GrRect& src) const {
+ GrPoint srcPts[4], dstPts[4];
+ srcPts[0].set(src.fLeft, src.fTop);
+ srcPts[1].set(src.fRight, src.fTop);
+ srcPts[2].set(src.fRight, src.fBottom);
+ srcPts[3].set(src.fLeft, src.fBottom);
+ this->mapPoints(dstPts, srcPts, 4);
+ dst->setBounds(dstPts, 4);
+}
+
+bool GrMatrix::hasPerspective() const {
+ GrAssert(!!(kPerspective_TypeBit & fTypeMask) ==
+ (fM[kPersp0] != 0 || fM[kPersp1] != 0 || fM[kPersp2] != gRESCALE));
+ return 0 != (kPerspective_TypeBit & fTypeMask);
+}
+
+bool GrMatrix::isIdentity() const {
+ GrAssert((0 == fTypeMask) ==
+ (GR_Scalar1 == fM[kScaleX] && 0 == fM[kSkewX] && 0 == fM[kTransX] &&
+ 0 == fM[kSkewY] && GR_Scalar1 == fM[kScaleY] && 0 == fM[kTransY] &&
+ 0 == fM[kPersp0] && 0 == fM[kPersp1] && gRESCALE == fM[kPersp2]));
+ return (0 == fTypeMask);
+}
+
+
+GrScalar GrMatrix::getMaxStretch() const {
+
+ if (fTypeMask & kPerspective_TypeBit) {
+ return -GR_Scalar1;
+ }
+
+ GrScalar stretch;
+
+ if (isIdentity()) {
+ stretch = GR_Scalar1;
+ } else if (!(fTypeMask & kSkew_TypeBit)) {
+ stretch = GrMax(GrScalarAbs(fM[kScaleX]), GrScalarAbs(fM[kScaleY]));
+ } else if (fTypeMask & kZeroScale_TypeBit) {
+ stretch = GrMax(GrScalarAbs(fM[kSkewX]), GrScalarAbs(fM[kSkewY]));
+ } else {
+ // ignore the translation part of the matrix, just look at 2x2 portion.
+ // compute singular values, take largest abs value.
+ // [a b; b c] = A^T*A
+ GrScalar a = GrMul(fM[kScaleX], fM[kScaleX]) + GrMul(fM[kSkewY], fM[kSkewY]);
+ GrScalar b = GrMul(fM[kScaleX], fM[kSkewX]) + GrMul(fM[kScaleY], fM[kSkewY]);
+ GrScalar c = GrMul(fM[kSkewX], fM[kSkewX]) + GrMul(fM[kScaleY], fM[kScaleY]);
+ // eigenvalues of A^T*A are the squared singular values of A.
+ // characteristic equation is det((A^T*A) - l*I) = 0
+ // l^2 - (a + c)l + (ac-b^2)
+ // solve using quadratic equation (divisor is non-zero since l^2 has 1 coeff
+ // and roots are guaraunteed to be pos and real).
+ GrScalar largerRoot;
+ GrScalar bSqd = GrMul(b,b);
+ // TODO: fixed point tolerance value.
+ if (bSqd < 1e-10) { // will be true if upper left 2x2 is orthogonal, which is common, so save some math
+ largerRoot = GrMax(a, c);
+ } else {
+ GrScalar aminusc = a - c;
+ GrScalar apluscdiv2 = (a + c) / 2;
+ GrScalar x = sqrtf(GrMul(aminusc,aminusc) + GrMul(4,(bSqd))) / 2;
+ largerRoot = apluscdiv2 + x;
+ }
+
+ stretch = sqrtf(largerRoot);
+ }
+#if GR_DEBUG && 0
+ // test a bunch of vectors. None should be scaled by more than stretch
+ // (modulo some error) and we should find a vector that is scaled by almost
+ // stretch.
+ GrPoint pt;
+ GrScalar max = 0;
+ for (int i = 0; i < 1000; ++i) {
+ GrScalar x = (float)rand() / RAND_MAX;
+ GrScalar y = sqrtf(1 - (x*x));
+ pt.fX = fM[kScaleX]*x + fM[kSkewX]*y;
+ pt.fY = fM[kSkewY]*x + fM[kScaleY]*y;
+ GrScalar d = pt.distanceToOrigin();
+ GrAssert(d <= (1.0001 * stretch));
+ max = GrMax(max, pt.distanceToOrigin());
+ }
+ GrAssert((stretch - max) < .05*stretch);
+#endif
+ return stretch;
+}
+
+bool GrMatrix::operator == (const GrMatrix& m) const {
+ if (fTypeMask != m.fTypeMask) {
+ return false;
+ }
+ if (!fTypeMask) {
+ return true;
+ }
+ for (int i = 0; i < 9; ++i) {
+ if (m.fM[i] != fM[i]) {
+ return false;
+ }
+ }
+ return true;
+}
+
+bool GrMatrix::operator != (const GrMatrix& m) const {
+ return !(*this == m);
+}
+
+void GrMatrix::setTypeMask()
+{
+ fTypeMask = 0;
+ if (0 != fM[kPersp0] || 0 != fM[kPersp1] || gRESCALE != fM[kPersp2]) {
+ fTypeMask |= kPerspective_TypeBit;
+ }
+ if (GR_Scalar1 != fM[kScaleX] || GR_Scalar1 != fM[kScaleY]) {
+ fTypeMask |= kScale_TypeBit;
+ if (0 == fM[kScaleX] && 0 == fM[kScaleY]) {
+ fTypeMask |= kZeroScale_TypeBit;
+ }
+ }
+ if (0 != fM[kSkewX] || 0 != fM[kSkewY]) {
+ fTypeMask |= kSkew_TypeBit;
+ }
+ if (0 != fM[kTransX] || 0 != fM[kTransY]) {
+ fTypeMask |= kTranslate_TypeBit;
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Matrix transformation procs
+//////
+
+void GrMatrix::mapIdentity(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i] = src[i];
+ }
+ }
+}
+
+void GrMatrix::mapScale(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = GrMul(src[i].fX, fM[kScaleX]);
+ dst[i].fY = GrMul(src[i].fY, fM[kScaleY]);
+ }
+}
+
+
+void GrMatrix::mapTranslate(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = src[i].fX + fM[kTransX];
+ dst[i].fY = src[i].fY + fM[kTransY];
+ }
+}
+
+void GrMatrix::mapScaleAndTranslate(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = GrMul(src[i].fX, fM[kScaleX]) + fM[kTransX];
+ dst[i].fY = GrMul(src[i].fY, fM[kScaleY]) + fM[kTransY];
+ }
+}
+
+void GrMatrix::mapSkew(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = src[i].fX + GrMul(src[i].fY, fM[kSkewX]);
+ dst[i].fY = src[i].fY + GrMul(src[i].fX, fM[kSkewY]);
+ }
+ } else {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar newX = src[i].fX + GrMul(src[i].fY, fM[kSkewX]);
+ dst[i].fY = src[i].fY + GrMul(src[i].fX, fM[kSkewY]);
+ dst[i].fX = newX;
+ }
+ }
+}
+
+void GrMatrix::mapScaleAndSkew(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = GrMul(src[i].fX, fM[kScaleX]) + GrMul(src[i].fY, fM[kSkewX]);
+ dst[i].fY = GrMul(src[i].fY, fM[kScaleY]) + GrMul(src[i].fX, fM[kSkewY]);
+ }
+ } else {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar newX = GrMul(src[i].fX, fM[kScaleX]) + GrMul(src[i].fY, fM[kSkewX]);
+ dst[i].fY = GrMul(src[i].fY, fM[kScaleY]) + GrMul(src[i].fX, fM[kSkewY]);
+ dst[i].fX = newX;
+ }
+ }
+}
+
+void GrMatrix::mapSkewAndTranslate(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = src[i].fX + GrMul(src[i].fY, fM[kSkewX]) + fM[kTransX];
+ dst[i].fY = src[i].fY + GrMul(src[i].fX, fM[kSkewY]) + fM[kTransY];
+ }
+ } else {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar newX = src[i].fX + GrMul(src[i].fY, fM[kSkewX]) + fM[kTransX];
+ dst[i].fY = src[i].fY + GrMul(src[i].fX, fM[kSkewY]) + fM[kTransY];
+ dst[i].fX = newX;
+ }
+ }
+}
+
+void GrMatrix::mapNonPerspective(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = GrMul(fM[kScaleX], src[i].fX) + GrMul(fM[kSkewX], src[i].fY) + fM[kTransX];
+ dst[i].fY = GrMul(fM[kSkewY], src[i].fX) + GrMul(fM[kScaleY], src[i].fY) + fM[kTransY];
+ }
+ } else {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar newX = GrMul(fM[kScaleX], src[i].fX) + GrMul(fM[kSkewX], src[i].fY) + fM[kTransX];
+ dst[i].fY = GrMul(fM[kSkewY], src[i].fX) + GrMul(fM[kScaleY], src[i].fY) + fM[kTransY];
+ dst[i].fX = newX;
+ }
+ }
+}
+
+void GrMatrix::mapPerspective(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar x, y, w;
+ x = GrMul(fM[kScaleX], src[i].fX) + GrMul(fM[kSkewX], src[i].fY) + fM[kTransX];
+ y = GrMul(fM[kSkewY], src[i].fX) + GrMul(fM[kScaleY], src[i].fY) + fM[kTransY];
+ w = GrMul(fM[kPersp0], src[i].fX) + GrMul(fM[kPersp1], src[i].fY) + fM[kPersp2];
+ // TODO need fixed point invert
+ if (w) {
+ w = 1 / w;
+ }
+ dst[i].fX = GrMul(x, w);
+ dst[i].fY = GrMul(y, w);
+ }
+}
+
+void GrMatrix::mapInvalid(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ GrAssert(0);
+}
+
+void GrMatrix::mapZero(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ memset(dst, 0, sizeof(GrPoint)*count);
+}
+
+void GrMatrix::mapSetToTranslate(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = fM[kTransX];
+ dst[i].fY = fM[kTransY];
+ }
+}
+
+void GrMatrix::mapSwappedScale(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = GrMul(src[i].fY, fM[kSkewX]);
+ dst[i].fY = GrMul(src[i].fX, fM[kSkewY]);
+ }
+ } else {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar newX = GrMul(src[i].fY, fM[kSkewX]);
+ dst[i].fY = GrMul(src[i].fX, fM[kSkewY]);
+ dst[i].fX = newX;
+ }
+ }
+}
+
+void GrMatrix::mapSwappedScaleAndTranslate(GrPoint* dst, const GrPoint* src, uint32_t count) const {
+ if (src != dst) {
+ for (uint32_t i = 0; i < count; ++i) {
+ dst[i].fX = GrMul(src[i].fY, fM[kSkewX]) + fM[kTransX];
+ dst[i].fY = GrMul(src[i].fX, fM[kSkewY]) + fM[kTransY];
+ }
+ } else {
+ for (uint32_t i = 0; i < count; ++i) {
+ GrScalar newX = GrMul(src[i].fY, fM[kSkewX]) + fM[kTransX];
+ dst[i].fY = GrMul(src[i].fX, fM[kSkewY]) + fM[kTransY];
+ dst[i].fX = newX;
+ }
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Unit test
+//////
+
+#include "GrRandom.h"
+
+#if GR_DEBUG
+enum MatrixType {
+ kRotate_MatrixType,
+ kScaleX_MatrixType,
+ kScaleY_MatrixType,
+ kSkewX_MatrixType,
+ kSkewY_MatrixType,
+ kTranslateX_MatrixType,
+ kTranslateY_MatrixType,
+ kSwapScaleXY_MatrixType,
+ kPersp_MatrixType,
+
+ kMatrixTypeCount
+};
+
+static void create_matrix(GrMatrix* matrix, GrRandom& rand) {
+ MatrixType type = (MatrixType)(rand.nextU() % kMatrixTypeCount);
+ switch (type) {
+ case kRotate_MatrixType: {
+ float angle = rand.nextF() * 2 *3.14159265358979323846f;
+ GrScalar cosa = GrFloatToScalar(cosf(angle));
+ GrScalar sina = GrFloatToScalar(sinf(angle));
+ matrix->setAll(cosa, -sina, 0,
+ sina, cosa, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kScaleX_MatrixType: {
+ GrScalar scale = GrFloatToScalar(rand.nextF(-2, 2));
+ matrix->setAll(scale, 0, 0,
+ 0, GR_Scalar1, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kScaleY_MatrixType: {
+ GrScalar scale = GrFloatToScalar(rand.nextF(-2, 2));
+ matrix->setAll(GR_Scalar1, 0, 0,
+ 0, scale, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kSkewX_MatrixType: {
+ GrScalar skew = GrFloatToScalar(rand.nextF(-2, 2));
+ matrix->setAll(GR_Scalar1, skew, 0,
+ 0, GR_Scalar1, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kSkewY_MatrixType: {
+ GrScalar skew = GrFloatToScalar(rand.nextF(-2, 2));
+ matrix->setAll(GR_Scalar1, 0, 0,
+ skew, GR_Scalar1, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kTranslateX_MatrixType: {
+ GrScalar trans = GrFloatToScalar(rand.nextF(-10, 10));
+ matrix->setAll(GR_Scalar1, 0, trans,
+ 0, GR_Scalar1, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kTranslateY_MatrixType: {
+ GrScalar trans = GrFloatToScalar(rand.nextF(-10, 10));
+ matrix->setAll(GR_Scalar1, 0, 0,
+ 0, GR_Scalar1, trans,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kSwapScaleXY_MatrixType: {
+ GrScalar xy = GrFloatToScalar(rand.nextF(-2, 2));
+ GrScalar yx = GrFloatToScalar(rand.nextF(-2, 2));
+ matrix->setAll(0, xy, 0,
+ yx, 0, 0,
+ 0, 0, GrMatrix::I()[8]);
+ } break;
+ case kPersp_MatrixType: {
+ GrScalar p0 = GrFloatToScalar(rand.nextF(-2, 2));
+ GrScalar p1 = GrFloatToScalar(rand.nextF(-2, 2));
+ GrScalar p2 = GrFloatToScalar(rand.nextF(-0.5f, 0.75f));
+ matrix->setAll(GR_Scalar1, 0, 0,
+ 0, GR_Scalar1, 0,
+ p0, p1, GrMul(p2,GrMatrix::I()[8]));
+ } break;
+ default:
+ GrAssert(0);
+ break;
+ }
+}
+#endif
+
+void GrMatrix::UnitTest() {
+ GrRandom rand;
+
+ // Create a bunch of matrices and test point mapping, max stretch calc,
+ // inversion and multiply-by-inverse.
+#if GR_DEBUG
+ for (int i = 0; i < 10000; ++i) {
+ GrMatrix a, b;
+ a.setIdentity();
+ int num = rand.nextU() % 6;
+ // force testing of I and swapXY
+ if (0 == i) {
+ num = 0;
+ GrAssert(a.isIdentity());
+ } else if (1 == i) {
+ num = 0;
+ a.setAll(0, GR_Scalar1, 0,
+ GR_Scalar1, 0, 0,
+ 0, 0, I()[8]);
+ }
+ for (int j = 0; j < num; ++j) {
+ create_matrix(&b, rand);
+ a.preConcat(b);
+ }
+
+ GrScalar maxStretch = a.getMaxStretch();
+ if (maxStretch > 0) {
+ maxStretch = GrMul(GR_Scalar1 + GR_Scalar1 / 100, maxStretch);
+ }
+ GrPoint origin = a.mapPoint(GrPoint(0,0));
+
+ for (int j = 0; j < 9; ++j) {
+ int mask, origMask = a.fTypeMask;
+ GrScalar old = a[j];
+
+ a.set(j, GR_Scalar1);
+ mask = a.fTypeMask;
+ a.setTypeMask();
+ GrAssert(mask == a.fTypeMask);
+
+ a.set(j, 0);
+ mask = a.fTypeMask;
+ a.setTypeMask();
+ GrAssert(mask == a.fTypeMask);
+
+ a.set(j, 10 * GR_Scalar1);
+ mask = a.fTypeMask;
+ a.setTypeMask();
+ GrAssert(mask == a.fTypeMask);
+
+ a.set(j, old);
+ GrAssert(a.fTypeMask == origMask);
+ }
+
+ for (int j = 0; j < 100; ++j) {
+ GrPoint pt;
+ pt.fX = GrFloatToScalar(rand.nextF(-10, 10));
+ pt.fY = GrFloatToScalar(rand.nextF(-10, 10));
+
+ GrPoint t0, t1, t2;
+ t0 = a.mapPoint(pt); // map to a new point
+ t1 = pt;
+ a.mapPoints(&t1, &t1, 1); // in place
+ a.mapPerspective(&t2, &pt, 1); // full mult
+ GrAssert(t0 == t1 && t1 == t2);
+ if (maxStretch >= 0.f) {
+ GrVec vec;
+ vec.setBetween(t0, origin);
+ GrScalar stretch = vec.length() / pt.distanceToOrigin();
+ GrAssert(stretch <= maxStretch);
+ }
+ }
+ double det = a.determinant();
+ if (fabs(det) > 1e-3 && a.invert(&b)) {
+ GrMatrix c;
+ c.setConcat(a,b);
+ for (int i = 0; i < 9; ++i) {
+ GrScalar diff = GrScalarAbs(c[i] - I()[i]);
+ GrAssert(diff < (5*GR_Scalar1 / 100));
+ }
+ }
+ }
+#endif
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+int Gr_clz(uint32_t n) {
+ if (0 == n) {
+ return 32;
+ }
+
+ int count = 0;
+ if (0 == (n & 0xFFFF0000)) {
+ count += 16;
+ n <<= 16;
+ }
+ if (0 == (n & 0xFF000000)) {
+ count += 8;
+ n <<= 8;
+ }
+ if (0 == (n & 0xF0000000)) {
+ count += 4;
+ n <<= 4;
+ }
+ if (0 == (n & 0xC0000000)) {
+ count += 2;
+ n <<= 2;
+ }
+ if (0 == (n & 0x80000000)) {
+ count += 1;
+ }
+ return count;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+#include "GrRect.h"
+
+void GrRect::setBounds(const GrPoint pts[], int count) {
+ if (count <= 0) {
+ this->setEmpty();
+ } else {
+ GrScalar L, R, T, B;
+ L = R = pts[0].fX;
+ T = B = pts[0].fY;
+ for (int i = 1; i < count; i++) {
+ GrScalar x = pts[i].fX;
+ GrScalar y = pts[i].fY;
+ if (x < L) {
+ L = x;
+ } else if (x > R) {
+ R = x;
+ }
+ if (y < T) {
+ T = y;
+ } else if (y > B) {
+ B = y;
+ }
+ }
+ this->setLTRB(L, T, R, B);
+ }
+}
+
+