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Diffstat (limited to 'gfx/2d/PathCairo.cpp')
| -rw-r--r-- | gfx/2d/PathCairo.cpp | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/gfx/2d/PathCairo.cpp b/gfx/2d/PathCairo.cpp new file mode 100644 index 000000000..45bc201cb --- /dev/null +++ b/gfx/2d/PathCairo.cpp @@ -0,0 +1,331 @@ +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "PathCairo.h" +#include <math.h> +#include "DrawTargetCairo.h" +#include "Logging.h" +#include "PathHelpers.h" +#include "HelpersCairo.h" + +namespace mozilla { +namespace gfx { + +PathBuilderCairo::PathBuilderCairo(FillRule aFillRule) + : mFillRule(aFillRule) +{ +} + +void +PathBuilderCairo::MoveTo(const Point &aPoint) +{ + cairo_path_data_t data; + data.header.type = CAIRO_PATH_MOVE_TO; + data.header.length = 2; + mPathData.push_back(data); + data.point.x = aPoint.x; + data.point.y = aPoint.y; + mPathData.push_back(data); + + mBeginPoint = mCurrentPoint = aPoint; +} + +void +PathBuilderCairo::LineTo(const Point &aPoint) +{ + cairo_path_data_t data; + data.header.type = CAIRO_PATH_LINE_TO; + data.header.length = 2; + mPathData.push_back(data); + data.point.x = aPoint.x; + data.point.y = aPoint.y; + mPathData.push_back(data); + + mCurrentPoint = aPoint; +} + +void +PathBuilderCairo::BezierTo(const Point &aCP1, + const Point &aCP2, + const Point &aCP3) +{ + cairo_path_data_t data; + data.header.type = CAIRO_PATH_CURVE_TO; + data.header.length = 4; + mPathData.push_back(data); + data.point.x = aCP1.x; + data.point.y = aCP1.y; + mPathData.push_back(data); + data.point.x = aCP2.x; + data.point.y = aCP2.y; + mPathData.push_back(data); + data.point.x = aCP3.x; + data.point.y = aCP3.y; + mPathData.push_back(data); + + mCurrentPoint = aCP3; +} + +void +PathBuilderCairo::QuadraticBezierTo(const Point &aCP1, + const Point &aCP2) +{ + // We need to elevate the degree of this quadratic Bézier to cubic, so we're + // going to add an intermediate control point, and recompute control point 1. + // The first and last control points remain the same. + // This formula can be found on http://fontforge.sourceforge.net/bezier.html + Point CP0 = CurrentPoint(); + Point CP1 = (CP0 + aCP1 * 2.0) / 3.0; + Point CP2 = (aCP2 + aCP1 * 2.0) / 3.0; + Point CP3 = aCP2; + + cairo_path_data_t data; + data.header.type = CAIRO_PATH_CURVE_TO; + data.header.length = 4; + mPathData.push_back(data); + data.point.x = CP1.x; + data.point.y = CP1.y; + mPathData.push_back(data); + data.point.x = CP2.x; + data.point.y = CP2.y; + mPathData.push_back(data); + data.point.x = CP3.x; + data.point.y = CP3.y; + mPathData.push_back(data); + + mCurrentPoint = aCP2; +} + +void +PathBuilderCairo::Close() +{ + cairo_path_data_t data; + data.header.type = CAIRO_PATH_CLOSE_PATH; + data.header.length = 1; + mPathData.push_back(data); + + mCurrentPoint = mBeginPoint; +} + +void +PathBuilderCairo::Arc(const Point &aOrigin, float aRadius, float aStartAngle, + float aEndAngle, bool aAntiClockwise) +{ + ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle, aAntiClockwise); +} + +Point +PathBuilderCairo::CurrentPoint() const +{ + return mCurrentPoint; +} + +already_AddRefed<Path> +PathBuilderCairo::Finish() +{ + return MakeAndAddRef<PathCairo>(mFillRule, mPathData, mCurrentPoint); +} + +PathCairo::PathCairo(FillRule aFillRule, std::vector<cairo_path_data_t> &aPathData, const Point &aCurrentPoint) + : mFillRule(aFillRule) + , mContainingContext(nullptr) + , mCurrentPoint(aCurrentPoint) +{ + mPathData.swap(aPathData); +} + +PathCairo::PathCairo(cairo_t *aContext) + : mFillRule(FillRule::FILL_WINDING) + , mContainingContext(nullptr) +{ + cairo_path_t *path = cairo_copy_path(aContext); + + // XXX - mCurrentPoint is not properly set here, the same is true for the + // D2D Path code, we never require current point when hitting this codepath + // but this should be fixed. + for (int i = 0; i < path->num_data; i++) { + mPathData.push_back(path->data[i]); + } + + cairo_path_destroy(path); +} + +PathCairo::~PathCairo() +{ + if (mContainingContext) { + cairo_destroy(mContainingContext); + } +} + +already_AddRefed<PathBuilder> +PathCairo::CopyToBuilder(FillRule aFillRule) const +{ + RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(aFillRule); + + builder->mPathData = mPathData; + builder->mCurrentPoint = mCurrentPoint; + + return builder.forget(); +} + +already_AddRefed<PathBuilder> +PathCairo::TransformedCopyToBuilder(const Matrix &aTransform, FillRule aFillRule) const +{ + RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(aFillRule); + + AppendPathToBuilder(builder, &aTransform); + builder->mCurrentPoint = aTransform.TransformPoint(mCurrentPoint); + + return builder.forget(); +} + +bool +PathCairo::ContainsPoint(const Point &aPoint, const Matrix &aTransform) const +{ + Matrix inverse = aTransform; + inverse.Invert(); + Point transformed = inverse.TransformPoint(aPoint); + + EnsureContainingContext(aTransform); + + return cairo_in_fill(mContainingContext, transformed.x, transformed.y); +} + +bool +PathCairo::StrokeContainsPoint(const StrokeOptions &aStrokeOptions, + const Point &aPoint, + const Matrix &aTransform) const +{ + Matrix inverse = aTransform; + inverse.Invert(); + Point transformed = inverse.TransformPoint(aPoint); + + EnsureContainingContext(aTransform); + + SetCairoStrokeOptions(mContainingContext, aStrokeOptions); + + return cairo_in_stroke(mContainingContext, transformed.x, transformed.y); +} + +Rect +PathCairo::GetBounds(const Matrix &aTransform) const +{ + EnsureContainingContext(aTransform); + + double x1, y1, x2, y2; + + cairo_path_extents(mContainingContext, &x1, &y1, &x2, &y2); + Rect bounds(Float(x1), Float(y1), Float(x2 - x1), Float(y2 - y1)); + return aTransform.TransformBounds(bounds); +} + +Rect +PathCairo::GetStrokedBounds(const StrokeOptions &aStrokeOptions, + const Matrix &aTransform) const +{ + EnsureContainingContext(aTransform); + + double x1, y1, x2, y2; + + SetCairoStrokeOptions(mContainingContext, aStrokeOptions); + + cairo_stroke_extents(mContainingContext, &x1, &y1, &x2, &y2); + Rect bounds((Float)x1, (Float)y1, (Float)(x2 - x1), (Float)(y2 - y1)); + return aTransform.TransformBounds(bounds); +} + +void +PathCairo::StreamToSink(PathSink *aSink) const +{ + for (size_t i = 0; i < mPathData.size(); i++) { + switch (mPathData[i].header.type) { + case CAIRO_PATH_MOVE_TO: + i++; + aSink->MoveTo(Point(mPathData[i].point.x, mPathData[i].point.y)); + break; + case CAIRO_PATH_LINE_TO: + i++; + aSink->LineTo(Point(mPathData[i].point.x, mPathData[i].point.y)); + break; + case CAIRO_PATH_CURVE_TO: + aSink->BezierTo(Point(mPathData[i + 1].point.x, mPathData[i + 1].point.y), + Point(mPathData[i + 2].point.x, mPathData[i + 2].point.y), + Point(mPathData[i + 3].point.x, mPathData[i + 3].point.y)); + i += 3; + break; + case CAIRO_PATH_CLOSE_PATH: + aSink->Close(); + break; + default: + // Corrupt path data! + MOZ_ASSERT(false); + } + } +} + +void +PathCairo::EnsureContainingContext(const Matrix &aTransform) const +{ + if (mContainingContext) { + if (mContainingTransform.ExactlyEquals(aTransform)) { + return; + } + } else { + mContainingContext = cairo_create(DrawTargetCairo::GetDummySurface()); + } + + mContainingTransform = aTransform; + + cairo_matrix_t mat; + GfxMatrixToCairoMatrix(mContainingTransform, mat); + cairo_set_matrix(mContainingContext, &mat); + + SetPathOnContext(mContainingContext); +} + +void +PathCairo::SetPathOnContext(cairo_t *aContext) const +{ + // Needs the correct fill rule set. + cairo_set_fill_rule(aContext, GfxFillRuleToCairoFillRule(mFillRule)); + + cairo_new_path(aContext); + + if (mPathData.size()) { + cairo_path_t path; + path.data = const_cast<cairo_path_data_t*>(&mPathData.front()); + path.num_data = mPathData.size(); + path.status = CAIRO_STATUS_SUCCESS; + cairo_append_path(aContext, &path); + } +} + +void +PathCairo::AppendPathToBuilder(PathBuilderCairo *aBuilder, const Matrix *aTransform) const +{ + if (aTransform) { + size_t i = 0; + while (i < mPathData.size()) { + uint32_t pointCount = mPathData[i].header.length - 1; + aBuilder->mPathData.push_back(mPathData[i]); + i++; + for (uint32_t c = 0; c < pointCount; c++) { + cairo_path_data_t data; + Point newPoint = aTransform->TransformPoint(Point(mPathData[i].point.x, mPathData[i].point.y)); + data.point.x = newPoint.x; + data.point.y = newPoint.y; + aBuilder->mPathData.push_back(data); + i++; + } + } + } else { + for (size_t i = 0; i < mPathData.size(); i++) { + aBuilder->mPathData.push_back(mPathData[i]); + } + } +} + +} // namespace gfx +} // namespace mozilla |