diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/libcamera/geometry.cpp | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp index b12e1a62..13644689 100644 --- a/src/libcamera/geometry.cpp +++ b/src/libcamera/geometry.cpp @@ -10,6 +10,8 @@ #include <sstream> #include <stdint.h> +#include "libcamera/internal/log.h" + /** * \file geometry.h * \brief Data structures related to geometric objects @@ -18,6 +20,70 @@ namespace libcamera { /** + * \class Point + * \brief Describe a point in two-dimensional space + * + * The Point structure defines a point in two-dimensional space with integer + * precision. The coordinates of a Point may be negative as well as positive. + */ + +/** + * \fn Point::Point() + * \brief Construct a Point with x and y set to 0 + */ + +/** + * \fn Point::Point(int xpos, int ypos) + * \brief Construct a Point at given \a xpos and \a ypos values + * \param[in] xpos The x-coordinate + * \param[in] ypos The y-coordinate + */ + +/** + * \var Point::x + * \brief The x-coordinate of the Point + */ + +/** + * \var Point::y + * \brief The y-coordinate of the Point + */ + +/** + * \brief Assemble and return a string describing the point + * \return A string describing the point + */ +const std::string Point::toString() const +{ + std::stringstream ss; + + ss << "(" << x << "," << y << ")"; + + return ss.str(); +} + +/** + * \fn Point Point::operator-() const + * \brief Negate a Point by negating both its x and y coordinates + * \return The negated point + */ + +/** + * \brief Compare points for equality + * \return True if the two points are equal, false otherwise + */ +bool operator==(const Point &lhs, const Point &rhs) +{ + return lhs.x == rhs.x && lhs.y == rhs.y; +} + +/** + * \fn bool operator!=(const Point &lhs, const Point &rhs) + * \brief Compare points for inequality + * \return True if the two points are not equal, false otherwise + */ + +/** * \struct Size * \brief Describe a two-dimensional size * @@ -144,6 +210,117 @@ const std::string Size::toString() const */ /** + * \brief Bound the size down to match the aspect ratio given by \a ratio + * \param[in] ratio The size whose aspect ratio must be matched + * + * The behaviour of this function is undefined if either the width or the + * height of the \a ratio is zero. + * + * \return A Size whose width and height are equal to the width and height + * of this Size aligned down to the aspect ratio of \a ratio + */ +Size Size::boundedToAspectRatio(const Size &ratio) const +{ + ASSERT(ratio.width && ratio.height); + + uint64_t ratio1 = static_cast<uint64_t>(width) * + static_cast<uint64_t>(ratio.height); + uint64_t ratio2 = static_cast<uint64_t>(ratio.width) * + static_cast<uint64_t>(height); + + if (ratio1 > ratio2) + return { static_cast<unsigned int>(ratio2 / ratio.height), height }; + else + return { width, static_cast<unsigned int>(ratio1 / ratio.width) }; +} + +/** + * \brief Expand the size to match the aspect ratio given by \a ratio + * \param[in] ratio The size whose aspect ratio must be matched + * + * The behaviour of this function is undefined if either the width or the + * height of the \a ratio is zero. + * + * \return A Size whose width and height are equal to the width and height + * of this Size expanded up to the aspect ratio of \a ratio + */ +Size Size::expandedToAspectRatio(const Size &ratio) const +{ + ASSERT(ratio.width && ratio.height); + + uint64_t ratio1 = static_cast<uint64_t>(width) * + static_cast<uint64_t>(ratio.height); + uint64_t ratio2 = static_cast<uint64_t>(ratio.width) * + static_cast<uint64_t>(height); + + if (ratio1 < ratio2) + return { static_cast<unsigned int>(ratio2 / ratio.height), height }; + else + return { width, static_cast<unsigned int>(ratio1 / ratio.width) }; +} + +/** + * \brief Center a rectangle of this size at a given Point + * \param[in] center The center point the Rectangle is to have + * + * A Rectangle of this object's size is positioned so that its center + * is at the given Point. + * + * \return A Rectangle of this size, centered at the given Point. + */ +Rectangle Size::centeredTo(const Point ¢er) const +{ + int x = center.x - width / 2; + int y = center.y - height / 2; + + return { x, y, width, height }; +} + +/** + * \brief Scale size up by the given factor + * \param[in] factor The factor + * \return The scaled Size + */ +Size Size::operator*(float factor) const +{ + return Size(width * factor, height * factor); +} + +/** + * \brief Scale size down by the given factor + * \param[in] factor The factor + * \return The scaled Size + */ +Size Size::operator/(float factor) const +{ + return Size(width / factor, height / factor); +} + +/** + * \brief Scale this size up by the given factor in place + * \param[in] factor The factor + * \return A reference to this object + */ +Size &Size::operator*=(float factor) +{ + width *= factor; + height *= factor; + return *this; +} + +/** + * \brief Scale this size down by the given factor in place + * \param[in] factor The factor + * \return A reference to this object + */ +Size &Size::operator/=(float factor) +{ + width /= factor; + height /= factor; + return *this; +} + +/** * \brief Compare sizes for equality * \return True if the two sizes are equal, false otherwise */ @@ -366,6 +543,13 @@ bool operator==(const SizeRange &lhs, const SizeRange &rhs) */ /** + * \fn Rectangle::Rectangle(const Size &size) + * \brief Construct a Rectangle of \a size with its top left corner located + * at (0,0) + * \param[in] size The desired Rectangle size + */ + +/** * \var Rectangle::x * \brief The horizontal coordinate of the rectangle's top-left corner */ @@ -405,6 +589,156 @@ const std::string Rectangle::toString() const } /** + * \brief Retrieve the center point of this rectangle + * \return The center Point + */ +Point Rectangle::center() const +{ + return { x + static_cast<int>(width / 2), y + static_cast<int>(height / 2) }; +} + +/** + * \fn Size Rectangle::size() const + * \brief Retrieve the size of this rectangle + * \return The Rectangle size + */ + +/** + * \fn Point Rectangle::topLeft() const + * \brief Retrieve the coordinates of the top left corner of this Rectangle + * \return The Rectangle's top left corner + */ + +/** + * \brief Apply a non-uniform rational scaling in place to this Rectangle + * \param[in] numerator The numerators of the x and y scaling factors + * \param[in] denominator The denominators of the x and y scaling factors + * + * A non-uniform scaling is applied in place such the resulting x + * coordinates are multiplied by numerator.width / denominator.width, + * and similarly for the y coordinates (using height in place of width). + * + * \return A reference to this object + */ +Rectangle &Rectangle::scaleBy(const Size &numerator, const Size &denominator) +{ + x = static_cast<int64_t>(x) * numerator.width / denominator.width; + y = static_cast<int64_t>(y) * numerator.height / denominator.height; + width = static_cast<uint64_t>(width) * numerator.width / denominator.width; + height = static_cast<uint64_t>(height) * numerator.height / denominator.height; + + return *this; +} + +/** + * \brief Translate this Rectangle in place by the given Point + * \param[in] point The amount to translate the Rectangle by + * + * The Rectangle is translated in the x-direction by the point's x coordinate + * and in the y-direction by the point's y coordinate. + * + * \return A reference to this object + */ +Rectangle &Rectangle::translateBy(const Point &point) +{ + x += point.x; + y += point.y; + + return *this; +} + +/** + * \brief Calculate the intersection of this Rectangle with another + * \param[in] bound The Rectangle that is intersected with this Rectangle + * + * This method calculates the standard intersection of two rectangles. If the + * rectangles do not overlap in either the x or y direction, then the size + * of that dimension in the result (its width or height) is set to zero. Even + * when one dimension is set to zero, note that the other dimension may still + * have a positive value if there was some overlap. + * + * \return A Rectangle that is the intersection of the input rectangles + */ +Rectangle Rectangle::boundedTo(const Rectangle &bound) const +{ + int topLeftX = std::max(x, bound.x); + int topLeftY = std::max(y, bound.y); + int bottomRightX = std::min<int>(x + width, bound.x + bound.width); + int bottomRightY = std::min<int>(y + height, bound.y + bound.height); + + unsigned int newWidth = std::max(bottomRightX - topLeftX, 0); + unsigned int newHeight = std::max(bottomRightY - topLeftY, 0); + + return { topLeftX, topLeftY, newWidth, newHeight }; +} + +/** + * \brief Enclose a Rectangle so as not to exceed another Rectangle + * \param[in] boundary The limit that the returned Rectangle will not exceed + * + * The Rectangle is modified so that it does not exceed the given \a boundary. + * This process involves translating the Rectangle if any of its edges + * lie beyond \a boundary, so that those edges then lie along the boundary + * instead. + * + * If either width or height are larger than \a boundary, then the returned + * Rectangle is clipped to be no larger. But other than this, the + * Rectangle is not clipped or reduced in size, merely translated. + * + * Note that this is not a conventional Rectangle intersection function + * which is provided by boundedTo(). + * + * \return A Rectangle that does not extend beyond a boundary Rectangle + */ +Rectangle Rectangle::enclosedIn(const Rectangle &boundary) const +{ + /* We can't be bigger than the boundary rectangle. */ + Rectangle result = boundedTo(Rectangle{ x, y, boundary.size() }); + + result.x = std::clamp<int>(result.x, boundary.x, + boundary.x + boundary.width - result.width); + result.y = std::clamp<int>(result.y, boundary.y, + boundary.y + boundary.height - result.height); + + return result; +} + +/** + * \brief Apply a non-uniform rational scaling to this Rectangle + * \param[in] numerator The numerators of the x and y scaling factors + * \param[in] denominator The denominators of the x and y scaling factors + * + * A non-uniform scaling is applied such the resulting x + * coordinates are multiplied by numerator.width / denominator.width, + * and similarly for the y coordinates (using height in place of width). + * + * \return The non-uniformly scaled Rectangle + */ +Rectangle Rectangle::scaledBy(const Size &numerator, const Size &denominator) const +{ + int scaledX = static_cast<int64_t>(x) * numerator.width / denominator.width; + int scaledY = static_cast<int64_t>(y) * numerator.height / denominator.height; + unsigned int scaledWidth = static_cast<uint64_t>(width) * numerator.width / denominator.width; + unsigned int scaledHeight = static_cast<uint64_t>(height) * numerator.height / denominator.height; + + return { scaledX, scaledY, scaledWidth, scaledHeight }; +} + +/** + * \brief Translate a Rectangle by the given amounts + * \param[in] point The amount to translate the Rectangle by + * + * The Rectangle is translated in the x-direction by the point's x coordinate + * and in the y-direction by the point's y coordinate. + * + * \return The translated Rectangle + */ +Rectangle Rectangle::translatedBy(const Point &point) const +{ + return { x + point.x, y + point.y, width, height }; +} + +/** * \brief Compare rectangles for equality * \return True if the two rectangles are equal, false otherwise */ |