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replicant-frameworks_native/services/surfaceflinger/Transform.cpp
Mathias Agopian 0694d0f3b3 fix [3118445] Transform * Transform does not work as expected 
The problem wasn't in the multiply operator, but rather in the code
that built the transform from the HAL bitmask.

We now use the multiply operator to build the Transform from the bitmask,
which guarantees, it'll always be correct.

Also added a simple test for Transform.

Change-Id: I09bf3b0e51d92f59d83ea91c4cc94fc2aa0bf227
2010-10-24 14:53:05 -07:00

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/*
* Copyright (C) 2007 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.
*/
#include <math.h>
#include <cutils/compiler.h>
#include <utils/String8.h>
#include <ui/Region.h>
#include "Transform.h"
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
template <typename T> inline T min(T a, T b) {
return a<b ? a : b;
}
template <typename T> inline T min(T a, T b, T c) {
return min(a, min(b, c));
}
template <typename T> inline T min(T a, T b, T c, T d) {
return min(a, b, min(c, d));
}
template <typename T> inline T max(T a, T b) {
return a>b ? a : b;
}
template <typename T> inline T max(T a, T b, T c) {
return max(a, max(b, c));
}
template <typename T> inline T max(T a, T b, T c, T d) {
return max(a, b, max(c, d));
}
// ---------------------------------------------------------------------------
Transform::Transform() {
reset();
}
Transform::Transform(const Transform& other)
: mMatrix(other.mMatrix), mType(other.mType) {
}
Transform::Transform(uint32_t orientation) {
set(orientation, 0, 0);
}
Transform::~Transform() {
}
static const float EPSILON = 0.0f;
bool Transform::isZero(float f) {
return fabs(f) <= EPSILON;
}
bool Transform::absIsOne(float f) {
return isZero(fabs(f) - 1.0f);
}
Transform Transform::operator * (const Transform& rhs) const
{
if (CC_LIKELY(mType == IDENTITY))
return rhs;
Transform r(*this);
if (rhs.mType == IDENTITY)
return r;
// TODO: we could use mType to optimize the matrix multiply
const mat33& A(mMatrix);
const mat33& B(rhs.mMatrix);
mat33& D(r.mMatrix);
for (int i=0 ; i<3 ; i++) {
const float v0 = A[0][i];
const float v1 = A[1][i];
const float v2 = A[2][i];
D[0][i] = v0*B[0][0] + v1*B[0][1] + v2*B[0][2];
D[1][i] = v0*B[1][0] + v1*B[1][1] + v2*B[1][2];
D[2][i] = v0*B[2][0] + v1*B[2][1] + v2*B[2][2];
}
r.mType |= rhs.mType;
// TODO: we could recompute this value from r and rhs
r.mType &= 0xFF;
r.mType |= UNKNOWN_TYPE;
return r;
}
float const* Transform::operator [] (int i) const {
return mMatrix[i].v;
}
bool Transform::transformed() const {
return type() > TRANSLATE;
}
int Transform::tx() const {
return floorf(mMatrix[2][0] + 0.5f);
}
int Transform::ty() const {
return floorf(mMatrix[2][1] + 0.5f);
}
void Transform::reset() {
mType = IDENTITY;
for(int i=0 ; i<3 ; i++) {
vec3& v(mMatrix[i]);
for (int j=0 ; j<3 ; j++)
v[j] = ((i==j) ? 1.0f : 0.0f);
}
}
void Transform::set(float tx, float ty)
{
mMatrix[2][0] = tx;
mMatrix[2][1] = ty;
mMatrix[2][2] = 1.0f;
if (isZero(tx) && isZero(ty)) {
mType &= ~TRANSLATE;
} else {
mType |= TRANSLATE;
}
}
void Transform::set(float a, float b, float c, float d)
{
mat33& M(mMatrix);
M[0][0] = a; M[1][0] = b;
M[0][1] = c; M[1][1] = d;
M[0][2] = 0; M[1][2] = 0;
mType = UNKNOWN_TYPE;
}
status_t Transform::set(uint32_t flags, float w, float h)
{
if (flags & ROT_INVALID) {
// that's not allowed!
reset();
return BAD_VALUE;
}
Transform H, V, R;
if (flags & FLIP_H) {
H.mType = (FLIP_H << 8) | SCALE;
H.mType |= isZero(w) ? IDENTITY : TRANSLATE;
mat33& M(H.mMatrix);
M[0][0] = -1;
M[2][0] = w;
}
if (flags & FLIP_V) {
V.mType = (FLIP_V << 8) | SCALE;
V.mType |= isZero(h) ? IDENTITY : TRANSLATE;
mat33& M(V.mMatrix);
M[1][1] = -1;
M[2][1] = h;
}
if (flags & ROT_90) {
R.mType = (ROT_90 << 8) | ROTATE;
R.mType |= isZero(w) ? IDENTITY : TRANSLATE;
mat33& M(R.mMatrix);
M[0][0] = 0; M[1][0] =-1; M[2][0] = w;
M[0][1] = 1; M[1][1] = 0;
}
*this = ((H*V)*R);
return NO_ERROR;
}
Transform::vec2 Transform::transform(const vec2& v) const {
vec2 r;
const mat33& M(mMatrix);
r[0] = M[0][0]*v[0] + M[1][0]*v[1] + M[2][0];
r[1] = M[0][1]*v[0] + M[1][1]*v[1] + M[2][1];
return r;
}
Transform::vec3 Transform::transform(const vec3& v) const {
vec3 r;
const mat33& M(mMatrix);
r[0] = M[0][0]*v[0] + M[1][0]*v[1] + M[2][0]*v[2];
r[1] = M[0][1]*v[0] + M[1][1]*v[1] + M[2][1]*v[2];
r[2] = M[0][2]*v[0] + M[1][2]*v[1] + M[2][2]*v[2];
return r;
}
void Transform::transform(float* point, int x, int y) const
{
const mat33& M(mMatrix);
vec2 v(x, y);
v = transform(v);
point[0] = v[0];
point[1] = v[1];
}
Rect Transform::makeBounds(int w, int h) const
{
return transform( Rect(w, h) );
}
Rect Transform::transform(const Rect& bounds) const
{
Rect r;
vec2 lt( bounds.left, bounds.top );
vec2 rt( bounds.right, bounds.top );
vec2 lb( bounds.left, bounds.bottom );
vec2 rb( bounds.right, bounds.bottom );
lt = transform(lt);
rt = transform(rt);
lb = transform(lb);
rb = transform(rb);
r.left = floorf(min(lt[0], rt[0], lb[0], rb[0]) + 0.5f);
r.top = floorf(min(lt[1], rt[1], lb[1], rb[1]) + 0.5f);
r.right = floorf(max(lt[0], rt[0], lb[0], rb[0]) + 0.5f);
r.bottom = floorf(max(lt[1], rt[1], lb[1], rb[1]) + 0.5f);
return r;
}
Region Transform::transform(const Region& reg) const
{
Region out;
if (CC_UNLIKELY(transformed())) {
if (CC_LIKELY(preserveRects())) {
Region::const_iterator it = reg.begin();
Region::const_iterator const end = reg.end();
while (it != end) {
out.orSelf(transform(*it++));
}
} else {
out.set(transform(reg.bounds()));
}
} else {
out = reg.translate(tx(), ty());
}
return out;
}
uint32_t Transform::type() const
{
if (mType & UNKNOWN_TYPE) {
// recompute what this transform is
const mat33& M(mMatrix);
const float a = M[0][0];
const float b = M[1][0];
const float c = M[0][1];
const float d = M[1][1];
const float x = M[2][0];
const float y = M[2][1];
bool scale = false;
uint32_t flags = ROT_0;
if (isZero(b) && isZero(c)) {
if (a<0) flags |= FLIP_H;
if (d<0) flags |= FLIP_V;
if (!absIsOne(a) || !absIsOne(d)) {
scale = true;
}
} else if (isZero(a) && isZero(d)) {
flags |= ROT_90;
if (b>0) flags |= FLIP_H;
if (c<0) flags |= FLIP_V;
if (!absIsOne(b) || !absIsOne(c)) {
scale = true;
}
} else {
flags = ROT_INVALID;
}
mType = flags << 8;
if (flags & ROT_INVALID) {
mType |= UNKNOWN;
} else {
if ((flags & ROT_90) || ((flags & ROT_180) == ROT_180))
mType |= ROTATE;
if (flags & FLIP_H)
mType ^= SCALE;
if (flags & FLIP_V)
mType ^= SCALE;
if (scale)
mType |= SCALE;
}
if (!isZero(x) || !isZero(y))
mType |= TRANSLATE;
}
return mType;
}
uint32_t Transform::getType() const {
return type() & 0xFF;
}
uint32_t Transform::getOrientation() const
{
return (type() >> 8) & 0xFF;
}
bool Transform::preserveRects() const
{
return (type() & ROT_INVALID) ? false : true;
}
void Transform::dump(const char* name) const
{
type(); // updates the type
String8 flags, type;
const mat33& m(mMatrix);
uint32_t orient = mType >> 8;
if (orient&ROT_INVALID) {
flags.append("ROT_INVALID ");
} else {
if (orient&ROT_90) {
flags.append("ROT_90 ");
} else {
flags.append("ROT_0 ");
}
if (orient&FLIP_V)
flags.append("FLIP_V ");
if (orient&FLIP_H)
flags.append("FLIP_H ");
}
if (!(mType&(SCALE|ROTATE|TRANSLATE)))
type.append("IDENTITY ");
if (mType&SCALE)
type.append("SCALE ");
if (mType&ROTATE)
type.append("ROTATE ");
if (mType&TRANSLATE)
type.append("TRANSLATE ");
LOGD("%s 0x%08x (%s, %s)", name, mType, flags.string(), type.string());
LOGD("%.4f %.4f %.4f", m[0][0], m[1][0], m[2][0]);
LOGD("%.4f %.4f %.4f", m[0][1], m[1][1], m[2][1]);
LOGD("%.4f %.4f %.4f", m[0][2], m[1][2], m[2][2]);
}
// ---------------------------------------------------------------------------
}; // namespace android
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