michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "Matrix.h"
michael@0: #include "Tools.h"
michael@0: #include <math.h>
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gfx {
michael@0: 
michael@0: Matrix
michael@0: Matrix::Rotation(Float aAngle)
michael@0: {
michael@0:   Matrix newMatrix;
michael@0: 
michael@0:   Float s = sin(aAngle);
michael@0:   Float c = cos(aAngle);
michael@0: 
michael@0:   newMatrix._11 = c;
michael@0:   newMatrix._12 = s;
michael@0:   newMatrix._21 = -s;
michael@0:   newMatrix._22 = c;
michael@0:   
michael@0:   return newMatrix;
michael@0: }
michael@0: 
michael@0: Rect
michael@0: Matrix::TransformBounds(const Rect &aRect) const
michael@0: {
michael@0:   int i;
michael@0:   Point quad[4];
michael@0:   Float min_x, max_x;
michael@0:   Float min_y, max_y;
michael@0: 
michael@0:   quad[0] = *this * aRect.TopLeft();
michael@0:   quad[1] = *this * aRect.TopRight();
michael@0:   quad[2] = *this * aRect.BottomLeft();
michael@0:   quad[3] = *this * aRect.BottomRight();
michael@0: 
michael@0:   min_x = max_x = quad[0].x;
michael@0:   min_y = max_y = quad[0].y;
michael@0: 
michael@0:   for (i = 1; i < 4; i++) {
michael@0:     if (quad[i].x < min_x)
michael@0:       min_x = quad[i].x;
michael@0:     if (quad[i].x > max_x)
michael@0:       max_x = quad[i].x;
michael@0: 
michael@0:     if (quad[i].y < min_y)
michael@0:       min_y = quad[i].y;
michael@0:     if (quad[i].y > max_y)
michael@0:       max_y = quad[i].y;
michael@0:   }
michael@0: 
michael@0:   return Rect(min_x, min_y, max_x - min_x, max_y - min_y);
michael@0: }
michael@0: 
michael@0: void
michael@0: Matrix::NudgeToIntegers()
michael@0: {
michael@0:   NudgeToInteger(&_11);
michael@0:   NudgeToInteger(&_12);
michael@0:   NudgeToInteger(&_21);
michael@0:   NudgeToInteger(&_22);
michael@0:   NudgeToInteger(&_31);
michael@0:   NudgeToInteger(&_32);
michael@0: }
michael@0: 
michael@0: Rect
michael@0: Matrix4x4::TransformBounds(const Rect& aRect) const
michael@0: {
michael@0:   Point quad[4];
michael@0:   Float min_x, max_x;
michael@0:   Float min_y, max_y;
michael@0: 
michael@0:   quad[0] = *this * aRect.TopLeft();
michael@0:   quad[1] = *this * aRect.TopRight();
michael@0:   quad[2] = *this * aRect.BottomLeft();
michael@0:   quad[3] = *this * aRect.BottomRight();
michael@0: 
michael@0:   min_x = max_x = quad[0].x;
michael@0:   min_y = max_y = quad[0].y;
michael@0: 
michael@0:   for (int i = 1; i < 4; i++) {
michael@0:     if (quad[i].x < min_x) {
michael@0:       min_x = quad[i].x;
michael@0:     }
michael@0:     if (quad[i].x > max_x) {
michael@0:       max_x = quad[i].x;
michael@0:     }
michael@0: 
michael@0:     if (quad[i].y < min_y) {
michael@0:       min_y = quad[i].y;
michael@0:     }
michael@0:     if (quad[i].y > max_y) {
michael@0:       max_y = quad[i].y;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return Rect(min_x, min_y, max_x - min_x, max_y - min_y);
michael@0: }
michael@0: 
michael@0: }
michael@0: }